TY  - CONF
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Erić, Milić
AU  - Marković, Zoran
AU  - Tomanović, Ivan
AU  - Crnomarković, Nenad
AU  - Stojanović, Andrijana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12766
AB  - Heating value is an important indicator for assessment of the coal quality. Machine learning models are powerful computational tools that allow for the analysis of various heat and mass transfer phenomena in energy systems. In this paper, Random forest model for determining the lower heating values of coal from the thermal power plant “Kolubara A” is developed based on proximate and ultimate fuel analysis. A database of the proximate and ultimate fuel analysis values and lower heating value of coal was created by experimental measurements in the accredited test laboratory of the Department of Thermal Engineering and Energy (“VINČA” Institute of Nuclear Sciences). The developed Random forest models, applied to a relatively small database, showed acceptable predictions for the lower heating value based on both the proximate analysis (RMSE = 0.22 MJ/kg and MAPE = 2.26%) and the ultimate analysis (RMSE = 0.64 MJ/kg and MAPE = 6.12%), with better accuracy achieved by the model whose input data consisted of the values of technical fuel analysis.
PB  - Belgrade : Society of Thermal Engineers of Serbia
C3  - International Conference Power Plants 2023 : Proceedings
T1  - Random forest model for determination of the lower heating value of TPP “Kolubara A” coal
SP  - 748
EP  - 752
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12766
ER  - 

@conference{
author = "Milićević, Aleksandar and Belošević, Srđan and Erić, Milić and Marković, Zoran and Tomanović, Ivan and Crnomarković, Nenad and Stojanović, Andrijana",
year = "2023",
abstract = "Heating value is an important indicator for assessment of the coal quality. Machine learning models are powerful computational tools that allow for the analysis of various heat and mass transfer phenomena in energy systems. In this paper, Random forest model for determining the lower heating values of coal from the thermal power plant “Kolubara A” is developed based on proximate and ultimate fuel analysis. A database of the proximate and ultimate fuel analysis values and lower heating value of coal was created by experimental measurements in the accredited test laboratory of the Department of Thermal Engineering and Energy (“VINČA” Institute of Nuclear Sciences). The developed Random forest models, applied to a relatively small database, showed acceptable predictions for the lower heating value based on both the proximate analysis (RMSE = 0.22 MJ/kg and MAPE = 2.26%) and the ultimate analysis (RMSE = 0.64 MJ/kg and MAPE = 6.12%), with better accuracy achieved by the model whose input data consisted of the values of technical fuel analysis.",
publisher = "Belgrade : Society of Thermal Engineers of Serbia",
journal = "International Conference Power Plants 2023 : Proceedings",
title = "Random forest model for determination of the lower heating value of TPP “Kolubara A” coal",
pages = "748-752",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12766"
}

Milićević, A., Belošević, S., Erić, M., Marković, Z., Tomanović, I., Crnomarković, N.,& Stojanović, A.. (2023). Random forest model for determination of the lower heating value of TPP “Kolubara A” coal. in International Conference Power Plants 2023 : Proceedings
Belgrade : Society of Thermal Engineers of Serbia., 748-752.
https://hdl.handle.net/21.15107/rcub_vinar_12766

Milićević A, Belošević S, Erić M, Marković Z, Tomanović I, Crnomarković N, Stojanović A. Random forest model for determination of the lower heating value of TPP “Kolubara A” coal. in International Conference Power Plants 2023 : Proceedings. 2023;:748-752.
https://hdl.handle.net/21.15107/rcub_vinar_12766 .

Milićević, Aleksandar, Belošević, Srđan, Erić, Milić, Marković, Zoran, Tomanović, Ivan, Crnomarković, Nenad, Stojanović, Andrijana, "Random forest model for determination of the lower heating value of TPP “Kolubara A” coal" in International Conference Power Plants 2023 : Proceedings (2023):748-752,
https://hdl.handle.net/21.15107/rcub_vinar_12766 .

TY  - CONF
AU  - Tomanović, Ivan
AU  - Belošević, Srđan
AU  - Milićević, Aleksandar
AU  - Crnomarković, Nenad
AU  - Stojanović, Andrijana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12768
AB  - The development of both CPUs and GPUs slowly moved towards the multi-core processors at the start of this century, allowing for true execution of several applications in parallel, or running a single task over multiple threads. This was especially true when considering the affordable and widely available units. The development of powerful GPUs, helped brew an idea in scientific circles to process large and scalable matrices containing mostly non graphical data on the GPUs, the same way they are processing the textures, utilizing the advantage of concurrent execution of many simple operations. Recent advances allowed for even easier and more accessible utilization of new hardware by both the scientific circles and the public in general through the development of new programming tools, languages, and language extensions. In this paper we analyze the structure of an in-house CFD code developed for coal-fired boiler furnace simulations, with an idea to suggest an optimal algorithm structure that would allow this code to run on many-core architectures. This is an interesting task, especially given the recent increase in GPU computational abilities, led to the availability of powerful and affordable workstations capable of processing large data sets. Here we analyze the algorithm for a single thread optimized code, identifying potential problems and recursive dependencies, and suggest the structure that would allow movement towards the parallel versions of existing code and its execution on both multi- and many-core architectures. Goal of this analysis is to identify and understand the inherently recursive portions of the code that should undergo modifications to allow for fully parallel executions in future efficient simulations of boiler furnaces.
PB  - Belgrade : Society of Thermal Engineers of Serbia
C3  - International Conference Power Plants 2023 : Proceedings
T1  - Possibilities for parallel computations in utility scale furnace: The code structure analysis
SP  - 763
EP  - 771
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12768
ER  - 

@conference{
author = "Tomanović, Ivan and Belošević, Srđan and Milićević, Aleksandar and Crnomarković, Nenad and Stojanović, Andrijana",
year = "2023",
abstract = "The development of both CPUs and GPUs slowly moved towards the multi-core processors at the start of this century, allowing for true execution of several applications in parallel, or running a single task over multiple threads. This was especially true when considering the affordable and widely available units. The development of powerful GPUs, helped brew an idea in scientific circles to process large and scalable matrices containing mostly non graphical data on the GPUs, the same way they are processing the textures, utilizing the advantage of concurrent execution of many simple operations. Recent advances allowed for even easier and more accessible utilization of new hardware by both the scientific circles and the public in general through the development of new programming tools, languages, and language extensions. In this paper we analyze the structure of an in-house CFD code developed for coal-fired boiler furnace simulations, with an idea to suggest an optimal algorithm structure that would allow this code to run on many-core architectures. This is an interesting task, especially given the recent increase in GPU computational abilities, led to the availability of powerful and affordable workstations capable of processing large data sets. Here we analyze the algorithm for a single thread optimized code, identifying potential problems and recursive dependencies, and suggest the structure that would allow movement towards the parallel versions of existing code and its execution on both multi- and many-core architectures. Goal of this analysis is to identify and understand the inherently recursive portions of the code that should undergo modifications to allow for fully parallel executions in future efficient simulations of boiler furnaces.",
publisher = "Belgrade : Society of Thermal Engineers of Serbia",
journal = "International Conference Power Plants 2023 : Proceedings",
title = "Possibilities for parallel computations in utility scale furnace: The code structure analysis",
pages = "763-771",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12768"
}

Tomanović, I., Belošević, S., Milićević, A., Crnomarković, N.,& Stojanović, A.. (2023). Possibilities for parallel computations in utility scale furnace: The code structure analysis. in International Conference Power Plants 2023 : Proceedings
Belgrade : Society of Thermal Engineers of Serbia., 763-771.
https://hdl.handle.net/21.15107/rcub_vinar_12768

Tomanović I, Belošević S, Milićević A, Crnomarković N, Stojanović A. Possibilities for parallel computations in utility scale furnace: The code structure analysis. in International Conference Power Plants 2023 : Proceedings. 2023;:763-771.
https://hdl.handle.net/21.15107/rcub_vinar_12768 .

Tomanović, Ivan, Belošević, Srđan, Milićević, Aleksandar, Crnomarković, Nenad, Stojanović, Andrijana, "Possibilities for parallel computations in utility scale furnace: The code structure analysis" in International Conference Power Plants 2023 : Proceedings (2023):763-771,
https://hdl.handle.net/21.15107/rcub_vinar_12768 .

TY  - JOUR
AU  - Crnomarković, Nenad
AU  - Belošević, Srđan
AU  - Tomanović, Ivan
AU  - Milićević, Aleksandar
AU  - Stojanović, Andrijana
AU  - Tucaković, Dragan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12245
AB  - In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.
T2  - Thermal Science
T1  - Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace
VL  - 27
IS  - 6 Part A
SP  - 4539
EP  - 4549
DO  - 10.2298/TSCI230609173C
ER  - 

@article{
author = "Crnomarković, Nenad and Belošević, Srđan and Tomanović, Ivan and Milićević, Aleksandar and Stojanović, Andrijana and Tucaković, Dragan",
year = "2023",
abstract = "In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.",
journal = "Thermal Science",
title = "Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace",
volume = "27",
number = "6 Part A",
pages = "4539-4549",
doi = "10.2298/TSCI230609173C"
}

Crnomarković, N., Belošević, S., Tomanović, I., Milićević, A., Stojanović, A.,& Tucaković, D.. (2023). Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace. in Thermal Science, 27(6 Part A), 4539-4549.
https://doi.org/10.2298/TSCI230609173C

Crnomarković N, Belošević S, Tomanović I, Milićević A, Stojanović A, Tucaković D. Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace. in Thermal Science. 2023;27(6 Part A):4539-4549.
doi:10.2298/TSCI230609173C .

Crnomarković, Nenad, Belošević, Srđan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana, Tucaković, Dragan, "Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace" in Thermal Science, 27, no. 6 Part A (2023):4539-4549,
https://doi.org/10.2298/TSCI230609173C . .

TY  - JOUR
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Žarković, Mileta
AU  - Tomanović, Ivan
AU  - Crnomarković, Nenad
AU  - Stojanović, Andrijana
AU  - Stupar, Goran
AU  - Deng, Lei
AU  - Che, Defu
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11021
AB  - When planning the development of the energy sector, significant attention is given to the energy from the renewable sources, amongst which the biomass has an important role. Computational fluid mechanics and machine learning models are the powerful and efficient tools which allow the analysis of various heat and mass transfer phenomena in energy facilities. In this study, the in-house developed CFD code and machine learning models (Random Forest, Gradient Boosting and Artificial Neural Network) for predicting the biomass trajectories, particle mass burnout and residence time in a swirl burner reactor are presented. Pulverized biomass combustion cases (fine straw, pinewood and switch grass) with various mean diameters (ranging between 60 and 650 μm) and different shape factors (within the range 0–1) are considered. The results of numerical simulations revealed a noticeably nonlinear dependence between the input values (particle types, sizes and shapes) and the output values (particle trajectories, mass burnout and residence time), mostly due to the complex swirling flow in the reactor. For particles with the mean diameters within the ranges considered, the mass burnout of particles generally decreases as the biomass particle shape factor increases. The residence time of pulverized biomass in the reactor shows in most cases a decreasing trend as the particle shape factor increases. Artificial Neural Network showed the best predictions for both particle mass burnout (RMSE = 0.083 and R2 = 0.937) and particle residence time (RMSE = 1.145 s and R2 = 0.900), providing the reliable assessment of these important indicators in the combustion process.
T2  - Biomass and Bioenergy
T1  - Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach
VL  - 174
SP  - 106817
DO  - 10.1016/j.biombioe.2023.106817
ER  - 

@article{
author = "Milićević, Aleksandar and Belošević, Srđan and Žarković, Mileta and Tomanović, Ivan and Crnomarković, Nenad and Stojanović, Andrijana and Stupar, Goran and Deng, Lei and Che, Defu",
year = "2023",
abstract = "When planning the development of the energy sector, significant attention is given to the energy from the renewable sources, amongst which the biomass has an important role. Computational fluid mechanics and machine learning models are the powerful and efficient tools which allow the analysis of various heat and mass transfer phenomena in energy facilities. In this study, the in-house developed CFD code and machine learning models (Random Forest, Gradient Boosting and Artificial Neural Network) for predicting the biomass trajectories, particle mass burnout and residence time in a swirl burner reactor are presented. Pulverized biomass combustion cases (fine straw, pinewood and switch grass) with various mean diameters (ranging between 60 and 650 μm) and different shape factors (within the range 0–1) are considered. The results of numerical simulations revealed a noticeably nonlinear dependence between the input values (particle types, sizes and shapes) and the output values (particle trajectories, mass burnout and residence time), mostly due to the complex swirling flow in the reactor. For particles with the mean diameters within the ranges considered, the mass burnout of particles generally decreases as the biomass particle shape factor increases. The residence time of pulverized biomass in the reactor shows in most cases a decreasing trend as the particle shape factor increases. Artificial Neural Network showed the best predictions for both particle mass burnout (RMSE = 0.083 and R2 = 0.937) and particle residence time (RMSE = 1.145 s and R2 = 0.900), providing the reliable assessment of these important indicators in the combustion process.",
journal = "Biomass and Bioenergy",
title = "Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach",
volume = "174",
pages = "106817",
doi = "10.1016/j.biombioe.2023.106817"
}

Milićević, A., Belošević, S., Žarković, M., Tomanović, I., Crnomarković, N., Stojanović, A., Stupar, G., Deng, L.,& Che, D.. (2023). Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach. in Biomass and Bioenergy, 174, 106817.
https://doi.org/10.1016/j.biombioe.2023.106817

Milićević A, Belošević S, Žarković M, Tomanović I, Crnomarković N, Stojanović A, Stupar G, Deng L, Che D. Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach. in Biomass and Bioenergy. 2023;174:106817.
doi:10.1016/j.biombioe.2023.106817 .

Milićević, Aleksandar, Belošević, Srđan, Žarković, Mileta, Tomanović, Ivan, Crnomarković, Nenad, Stojanović, Andrijana, Stupar, Goran, Deng, Lei, Che, Defu, "Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach" in Biomass and Bioenergy, 174 (2023):106817,
https://doi.org/10.1016/j.biombioe.2023.106817 . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Belošević, Srđan
AU  - Nemoda, Stevan
AU  - Tomanović, Ivan
AU  - Milićević, Aleksandar
AU  - Stojanović, Andrijana D.
AU  - Stupar, Goran
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10754
AB  - The pulverized coal-fired furnaces are expected to use co-firing withbiomass for environmental reasons. Although the non-uniform ash depositsare formed on the furnace walls, the uniform deposits could be used for theanalysis of the furnace operation. The objective of this investigation wasdetermination of the uniform deposit thickness, used as a criterion forprediction of the sootblower activation moment in coal-biomass co-firing.The investigation comprised numerical simulations for uniform and nonuniform deposits to find the relative differences for the selected variablesthat were important for the sootblower activation: the mean wall fluxes andflame temperatures. The local thicknesses of the non-uniform deposits weredetermined by the gamma distribution for several mean and standarddeviation values using the inversion method. The thicknesses of the uniformdeposits were considered among the measures of central tendency: mode,mean, and median, of the non-uniform deposits. The mean was expected toprovide the smallest relative differences, while the mode was excluded fromfurther consideration after analysis of its values. The median was found tobe better choice than the mean, as it provided smaller relative differences ofthe selected variables for the thick deposits, which were important for thesootblower activation. The method based on comparison of the uniformdeposits for coal firing and those for the co-firing with biomass wasproposed for the prediction of the sootblower activation moment. Themethod can be used for the selection of the operational regimes for coalbiomass co-firing.
T2  - Thermal Science
T1  - Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace
VL  - 27
IS  - 1 Part B
SP  - 755
EP  - 766
DO  - 10.2298/TSCI220516149C
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Belošević, Srđan and Nemoda, Stevan and Tomanović, Ivan and Milićević, Aleksandar and Stojanović, Andrijana D. and Stupar, Goran",
year = "2022",
abstract = "The pulverized coal-fired furnaces are expected to use co-firing withbiomass for environmental reasons. Although the non-uniform ash depositsare formed on the furnace walls, the uniform deposits could be used for theanalysis of the furnace operation. The objective of this investigation wasdetermination of the uniform deposit thickness, used as a criterion forprediction of the sootblower activation moment in coal-biomass co-firing.The investigation comprised numerical simulations for uniform and nonuniform deposits to find the relative differences for the selected variablesthat were important for the sootblower activation: the mean wall fluxes andflame temperatures. The local thicknesses of the non-uniform deposits weredetermined by the gamma distribution for several mean and standarddeviation values using the inversion method. The thicknesses of the uniformdeposits were considered among the measures of central tendency: mode,mean, and median, of the non-uniform deposits. The mean was expected toprovide the smallest relative differences, while the mode was excluded fromfurther consideration after analysis of its values. The median was found tobe better choice than the mean, as it provided smaller relative differences ofthe selected variables for the thick deposits, which were important for thesootblower activation. The method based on comparison of the uniformdeposits for coal firing and those for the co-firing with biomass wasproposed for the prediction of the sootblower activation moment. Themethod can be used for the selection of the operational regimes for coalbiomass co-firing.",
journal = "Thermal Science",
title = "Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace",
volume = "27",
number = "1 Part B",
pages = "755-766",
doi = "10.2298/TSCI220516149C"
}

Crnomarković, N. Đ., Belošević, S., Nemoda, S., Tomanović, I., Milićević, A., Stojanović, A. D.,& Stupar, G.. (2022). Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace. in Thermal Science, 27(1 Part B), 755-766.
https://doi.org/10.2298/TSCI220516149C

Crnomarković NĐ, Belošević S, Nemoda S, Tomanović I, Milićević A, Stojanović AD, Stupar G. Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace. in Thermal Science. 2022;27(1 Part B):755-766.
doi:10.2298/TSCI220516149C .

Crnomarković, Nenad Đ., Belošević, Srđan, Nemoda, Stevan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana D., Stupar, Goran, "Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace" in Thermal Science, 27, no. 1 Part B (2022):755-766,
https://doi.org/10.2298/TSCI220516149C . .

TY  - JOUR
AU  - Stojanović, Andrijana D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan D.
AU  - Milićević, Aleksandar
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10177
AB  - Understanding nucleate pool boiling heat transfer and, in particular the accurate prediction of conditions that can lead to critical heat flux, is of the utmost importance in many industries. Due to the safety issues related to the nuclear power plants, and for the efficient operation of many heat transfer units including fossil fuel boilers, fusion reactors, electronic chips, etc., it is important to understand this kind of heat transfer. In this paper, a comprehensive review of analytical and numerical work on nucleate pool boiling heat transfer is presented. In order to understand this phenomenon, existing studies on boiling heat transfer coefficient and boiling heat flux are also discussed, as well as characteristics of boiling phenomena such as bubble departure diameter, bubble departure frequency, active nucleation site density, bubble waiting and growth period and their impact on pool boiling heat transfer.
T2  - Thermal Science
T1  - Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters
VL  - 26
IS  - 1 Part A
SP  - 157
EP  - 174
DO  - 10.2298/TSCI200111069S
ER  - 

@article{
author = "Stojanović, Andrijana D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan D. and Milićević, Aleksandar",
year = "2022",
abstract = "Understanding nucleate pool boiling heat transfer and, in particular the accurate prediction of conditions that can lead to critical heat flux, is of the utmost importance in many industries. Due to the safety issues related to the nuclear power plants, and for the efficient operation of many heat transfer units including fossil fuel boilers, fusion reactors, electronic chips, etc., it is important to understand this kind of heat transfer. In this paper, a comprehensive review of analytical and numerical work on nucleate pool boiling heat transfer is presented. In order to understand this phenomenon, existing studies on boiling heat transfer coefficient and boiling heat flux are also discussed, as well as characteristics of boiling phenomena such as bubble departure diameter, bubble departure frequency, active nucleation site density, bubble waiting and growth period and their impact on pool boiling heat transfer.",
journal = "Thermal Science",
title = "Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters",
volume = "26",
number = "1 Part A",
pages = "157-174",
doi = "10.2298/TSCI200111069S"
}

Stojanović, A. D., Belošević, S., Crnomarković, N. Đ., Tomanović, I. D.,& Milićević, A.. (2022). Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters. in Thermal Science, 26(1 Part A), 157-174.
https://doi.org/10.2298/TSCI200111069S

Stojanović AD, Belošević S, Crnomarković NĐ, Tomanović ID, Milićević A. Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters. in Thermal Science. 2022;26(1 Part A):157-174.
doi:10.2298/TSCI200111069S .

Stojanović, Andrijana D., Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan D., Milićević, Aleksandar, "Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters" in Thermal Science, 26, no. 1 Part A (2022):157-174,
https://doi.org/10.2298/TSCI200111069S . .

TY  - JOUR
AU  - Deng, Lei
AU  - Ma, Shihao
AU  - Jiang, Jiahao
AU  - Tie, Yuan
AU  - Zhang, Yan
AU  - Zhu, Zhengrong
AU  - Belošević, Srđan
AU  - Tomanović, Ivan
AU  - Che, Defu
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10232
AB  - Cofiring biomass syngas (BS) with pulverized coal under the oxy-fuel condition is a promising technology, which could encourage the utilization of biomass energy and reduce the emission of greenhouse gases. To investigate cofiring characteristics of biomass syngas and coal, a numerical study was conducted. The influences of oxy-fuel condition, syngas quality, and injection position on temperature distributions and flue gas components in boiler furnace were analyzed. To predict cofiring characteristics accurately under oxy-fuel conditions, a new refined weighted-sum-of-gray-gases model, HCN oxidation model, and NO-char reaction model were used. The simulation results show that syngas reburning and oxy-fuel conditions could reduce NO emission. The NO emission in O2/CO2O2/CO2O2/CO2 conditions is higher than that in air. Biomass syngas with higher calorific values contributes to higher furnace temperatures. Besides, biomass syngas with higher hydrocarbon components is beneficial to lower NO emission. Compared to pure coal combustion, NO concentration at the furnace outlet reduces by 40.2%, 69.0%, and 35.2% in the cases of cofiring with Type A, B, and C biomass syngas at a cofiring ratio of 10%, respectively. The injection position of biomass syngas also has crucial impacts on cofiring characteristics and NO emissions. NO emission has the lowest value when the biomass syngas is injected at the bottom level of the reburn zone. This study could provide a reference for optimization of boiler design and operation when cofiring biomass syngas with pulverized coal under the oxy-fuel condition.
T2  - Journal of Energy Engineering
T1  - Numerical Investigation on Cofiring Characteristics of Biomass Syngas and Coal in a 660-MW Tower Boiler
VL  - 148
IS  - 3
SP  - 04022014
DO  - 10.1061/(ASCE)EY.1943-7897.0000829
ER  - 

@article{
author = "Deng, Lei and Ma, Shihao and Jiang, Jiahao and Tie, Yuan and Zhang, Yan and Zhu, Zhengrong and Belošević, Srđan and Tomanović, Ivan and Che, Defu",
year = "2022",
abstract = "Cofiring biomass syngas (BS) with pulverized coal under the oxy-fuel condition is a promising technology, which could encourage the utilization of biomass energy and reduce the emission of greenhouse gases. To investigate cofiring characteristics of biomass syngas and coal, a numerical study was conducted. The influences of oxy-fuel condition, syngas quality, and injection position on temperature distributions and flue gas components in boiler furnace were analyzed. To predict cofiring characteristics accurately under oxy-fuel conditions, a new refined weighted-sum-of-gray-gases model, HCN oxidation model, and NO-char reaction model were used. The simulation results show that syngas reburning and oxy-fuel conditions could reduce NO emission. The NO emission in O2/CO2O2/CO2O2/CO2 conditions is higher than that in air. Biomass syngas with higher calorific values contributes to higher furnace temperatures. Besides, biomass syngas with higher hydrocarbon components is beneficial to lower NO emission. Compared to pure coal combustion, NO concentration at the furnace outlet reduces by 40.2%, 69.0%, and 35.2% in the cases of cofiring with Type A, B, and C biomass syngas at a cofiring ratio of 10%, respectively. The injection position of biomass syngas also has crucial impacts on cofiring characteristics and NO emissions. NO emission has the lowest value when the biomass syngas is injected at the bottom level of the reburn zone. This study could provide a reference for optimization of boiler design and operation when cofiring biomass syngas with pulverized coal under the oxy-fuel condition.",
journal = "Journal of Energy Engineering",
title = "Numerical Investigation on Cofiring Characteristics of Biomass Syngas and Coal in a 660-MW Tower Boiler",
volume = "148",
number = "3",
pages = "04022014",
doi = "10.1061/(ASCE)EY.1943-7897.0000829"
}

Deng, L., Ma, S., Jiang, J., Tie, Y., Zhang, Y., Zhu, Z., Belošević, S., Tomanović, I.,& Che, D.. (2022). Numerical Investigation on Cofiring Characteristics of Biomass Syngas and Coal in a 660-MW Tower Boiler. in Journal of Energy Engineering, 148(3), 04022014.
https://doi.org/10.1061/(ASCE)EY.1943-7897.0000829

Deng L, Ma S, Jiang J, Tie Y, Zhang Y, Zhu Z, Belošević S, Tomanović I, Che D. Numerical Investigation on Cofiring Characteristics of Biomass Syngas and Coal in a 660-MW Tower Boiler. in Journal of Energy Engineering. 2022;148(3):04022014.
doi:10.1061/(ASCE)EY.1943-7897.0000829 .

Deng, Lei, Ma, Shihao, Jiang, Jiahao, Tie, Yuan, Zhang, Yan, Zhu, Zhengrong, Belošević, Srđan, Tomanović, Ivan, Che, Defu, "Numerical Investigation on Cofiring Characteristics of Biomass Syngas and Coal in a 660-MW Tower Boiler" in Journal of Energy Engineering, 148, no. 3 (2022):04022014,
https://doi.org/10.1061/(ASCE)EY.1943-7897.0000829 . .

TY  - JOUR
AU  - Yuan, Maobo
AU  - Liu, Hu
AU  - Wu, Ying
AU  - Liang, Yong
AU  - Deng, Lei
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Che, Defu
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10190
AB  - Fireside metal temperature is quite important in the safety evaluation of boiler water-cooled wall. While little literature reported the accurate temperature calculation model for spiral water-cooled wall. This paper proposes a coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation. A computational fluid dynamics (CFD) model based on a 600 MW tangentially coal-fired boiler is used to provide the original heat flux distributions under various boiler loads. The reallocated heat distribution directly maps with the flow path of the spiral water-cooled wall. The combination of the heat reallocation model and thermal-hydraulic model is realized in MATLAB platform. The calculated temperature distributions at the outlet of the spiral water-cooled wall agree well with the in-situ data, and the maximum relative errors under 100% BMCR load and 75% THA load are 2.7% and 3.2%, respectively. The numerical results show that the working fluid flow rates of the divided loops are almost equal and the maximum metal temperatures of the spiral water-cooled wall are 732.1 K, 710.4 K, 760.9 K and 792.9 K under 100% BMCR, 75% THA, 50% THA and 35% BMCR loads, respectively. The local overheating is likely to occur in low boiler load. This model is intended to improve the metal temperature calculation method of the spiral water-cooled wall, which could benefit the safety monitoring of the boiler under variable loads. © 2022 Elsevier Masson SAS
T2  - International Journal of Thermal Sciences
T1  - Coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation
VL  - 177
SP  - 107557
DO  - 10.1016/j.ijthermalsci.2022.107557
ER  - 

@article{
author = "Yuan, Maobo and Liu, Hu and Wu, Ying and Liang, Yong and Deng, Lei and Belošević, Srđan and Tomanović, Ivan D. and Che, Defu",
year = "2022",
abstract = "Fireside metal temperature is quite important in the safety evaluation of boiler water-cooled wall. While little literature reported the accurate temperature calculation model for spiral water-cooled wall. This paper proposes a coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation. A computational fluid dynamics (CFD) model based on a 600 MW tangentially coal-fired boiler is used to provide the original heat flux distributions under various boiler loads. The reallocated heat distribution directly maps with the flow path of the spiral water-cooled wall. The combination of the heat reallocation model and thermal-hydraulic model is realized in MATLAB platform. The calculated temperature distributions at the outlet of the spiral water-cooled wall agree well with the in-situ data, and the maximum relative errors under 100% BMCR load and 75% THA load are 2.7% and 3.2%, respectively. The numerical results show that the working fluid flow rates of the divided loops are almost equal and the maximum metal temperatures of the spiral water-cooled wall are 732.1 K, 710.4 K, 760.9 K and 792.9 K under 100% BMCR, 75% THA, 50% THA and 35% BMCR loads, respectively. The local overheating is likely to occur in low boiler load. This model is intended to improve the metal temperature calculation method of the spiral water-cooled wall, which could benefit the safety monitoring of the boiler under variable loads. © 2022 Elsevier Masson SAS",
journal = "International Journal of Thermal Sciences",
title = "Coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation",
volume = "177",
pages = "107557",
doi = "10.1016/j.ijthermalsci.2022.107557"
}

Yuan, M., Liu, H., Wu, Y., Liang, Y., Deng, L., Belošević, S., Tomanović, I. D.,& Che, D.. (2022). Coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation. in International Journal of Thermal Sciences, 177, 107557.
https://doi.org/10.1016/j.ijthermalsci.2022.107557

Yuan M, Liu H, Wu Y, Liang Y, Deng L, Belošević S, Tomanović ID, Che D. Coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation. in International Journal of Thermal Sciences. 2022;177:107557.
doi:10.1016/j.ijthermalsci.2022.107557 .

Yuan, Maobo, Liu, Hu, Wu, Ying, Liang, Yong, Deng, Lei, Belošević, Srđan, Tomanović, Ivan D., Che, Defu, "Coordinate transformation method for heat reallocation in the spiral water-cooled wall temperature calculation" in International Journal of Thermal Sciences, 177 (2022):107557,
https://doi.org/10.1016/j.ijthermalsci.2022.107557 . .

TY  - JOUR
AU  - Deng, Lei
AU  - Dong, Lingxiao
AU  - Bai, Yang
AU  - Wu, Yuhao
AU  - Liu, Hu
AU  - Belošević, Srđan
AU  - Tomanović, Ivan
AU  - Che, Defu
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10227
AB  - The ultra-supercritical double-reheat boiler has attracted more attention because of high parameters (steam with high temperature and pressure), low pollution and large capacity. However, there are some difficulties in the development of this technology, such as adjusting the reheat steam temperature. In this study, computational fluid dynamics simulation is used to analyze a 660 MW double-reheat tower-type pulverized coal-fired boiler. The influence of flue gas recirculation (FGR) on heat transfer characteristics and combustion process in the furnace (including heating surfaces in the upper parts of the furnace) are evaluated. The user-defined function approach predicates the CO reduction effect on NOx. The results show that the flow at the horizontal section through the centerline of recirculating flus gas nozzles is rotating. The velocity distribution changes into an elliptical rotating flow when FGR ratio is 20%. At higher FGR ratios, the high-temperature area (1565–1700 K) shrinks and both the NOx concentration at the low-temperature superheater outlet and the O2 concentration in the burner zone descend. The O2 concentration at the low-temperature superheater outlet first increases and then decreases. In the main combustion zone, the heat flux peak of water-cooled wall is about 330 kW m−2. As FGR ratio increases from 0% to 20%, the rate of heat absorption of water-cooled wall to that of total boiler decreases by 3.50%. These rates for reheater and superheater increase by 2.53% and 2.13%, respectively.
T2  - Fuel
T1  - Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler
VL  - 321
SP  - 123988
DO  - 10.1016/j.fuel.2022.123988
ER  - 

@article{
author = "Deng, Lei and Dong, Lingxiao and Bai, Yang and Wu, Yuhao and Liu, Hu and Belošević, Srđan and Tomanović, Ivan and Che, Defu",
year = "2022",
abstract = "The ultra-supercritical double-reheat boiler has attracted more attention because of high parameters (steam with high temperature and pressure), low pollution and large capacity. However, there are some difficulties in the development of this technology, such as adjusting the reheat steam temperature. In this study, computational fluid dynamics simulation is used to analyze a 660 MW double-reheat tower-type pulverized coal-fired boiler. The influence of flue gas recirculation (FGR) on heat transfer characteristics and combustion process in the furnace (including heating surfaces in the upper parts of the furnace) are evaluated. The user-defined function approach predicates the CO reduction effect on NOx. The results show that the flow at the horizontal section through the centerline of recirculating flus gas nozzles is rotating. The velocity distribution changes into an elliptical rotating flow when FGR ratio is 20%. At higher FGR ratios, the high-temperature area (1565–1700 K) shrinks and both the NOx concentration at the low-temperature superheater outlet and the O2 concentration in the burner zone descend. The O2 concentration at the low-temperature superheater outlet first increases and then decreases. In the main combustion zone, the heat flux peak of water-cooled wall is about 330 kW m−2. As FGR ratio increases from 0% to 20%, the rate of heat absorption of water-cooled wall to that of total boiler decreases by 3.50%. These rates for reheater and superheater increase by 2.53% and 2.13%, respectively.",
journal = "Fuel",
title = "Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler",
volume = "321",
pages = "123988",
doi = "10.1016/j.fuel.2022.123988"
}

Deng, L., Dong, L., Bai, Y., Wu, Y., Liu, H., Belošević, S., Tomanović, I.,& Che, D.. (2022). Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler. in Fuel, 321, 123988.
https://doi.org/10.1016/j.fuel.2022.123988

Deng L, Dong L, Bai Y, Wu Y, Liu H, Belošević S, Tomanović I, Che D. Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler. in Fuel. 2022;321:123988.
doi:10.1016/j.fuel.2022.123988 .

Deng, Lei, Dong, Lingxiao, Bai, Yang, Wu, Yuhao, Liu, Hu, Belošević, Srđan, Tomanović, Ivan, Che, Defu, "Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler" in Fuel, 321 (2022):123988,
https://doi.org/10.1016/j.fuel.2022.123988 . .

TY  - JOUR
AU  - Deng, Lei
AU  - Zhang, Yan
AU  - Ma, Shihao
AU  - Zhu, Zhengrong
AU  - Liu, Hu
AU  - Belošević, Srđan
AU  - Tomanović, Ivan
AU  - Che, Defu
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13110
AB  - Ultra‐supercritical double‐reheat technology, as one of the most advanced coal‐fired power generation technology, is an important direction for emission reduction and energy saving in the world. In this study, the numerical calculation was executed in a 660‐MW ultra‐supercritical double‐reheat tower‐type boiler under deep‐air‐staging conditions. The refined HCN oxidation model was adopted to substitute the default model implemented by the user‐defined functions to calculate the NO x emission. The influences of the boiler load, over‐fire air (OFA) ratio, and excess air coefficient on temperature, species, and heat flux distributions were investigated. Results show that the decrement of the boiler load from boiler maximum continuous rating to 50% turbine heat acceptance gives rise to an increase of NO x emission. The heat flux distributions along with the furnace width direction present bell shaped. When the OFA ratio rises from 17% to 43%, NO x emission descends from 357.7 to 179.3 mg m −3 at the furnace outlet, and the heat flux distributions become more uniform along with the furnace width direction with lower peaks. Temperatures, species, and heat flux distributions are similar under the three different excess air coefficients. The NO x emission is the lowest when the excess air coefficient is 1.15. The results could provide a reference for combustion characteristics optimization and hydrodynamic calculation of ultra‐supercritical double‐reheat tower‐type boiler.
T2  - Asia-Pacific Journal of Chemical Engineering
T1  - Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler
VL  - 16
IS  - 3
SP  - e2631
DO  - 10.1002/apj.2631
ER  - 

@article{
author = "Deng, Lei and Zhang, Yan and Ma, Shihao and Zhu, Zhengrong and Liu, Hu and Belošević, Srđan and Tomanović, Ivan and Che, Defu",
year = "2021",
abstract = "Ultra‐supercritical double‐reheat technology, as one of the most advanced coal‐fired power generation technology, is an important direction for emission reduction and energy saving in the world. In this study, the numerical calculation was executed in a 660‐MW ultra‐supercritical double‐reheat tower‐type boiler under deep‐air‐staging conditions. The refined HCN oxidation model was adopted to substitute the default model implemented by the user‐defined functions to calculate the NO x emission. The influences of the boiler load, over‐fire air (OFA) ratio, and excess air coefficient on temperature, species, and heat flux distributions were investigated. Results show that the decrement of the boiler load from boiler maximum continuous rating to 50% turbine heat acceptance gives rise to an increase of NO x emission. The heat flux distributions along with the furnace width direction present bell shaped. When the OFA ratio rises from 17% to 43%, NO x emission descends from 357.7 to 179.3 mg m −3 at the furnace outlet, and the heat flux distributions become more uniform along with the furnace width direction with lower peaks. Temperatures, species, and heat flux distributions are similar under the three different excess air coefficients. The NO x emission is the lowest when the excess air coefficient is 1.15. The results could provide a reference for combustion characteristics optimization and hydrodynamic calculation of ultra‐supercritical double‐reheat tower‐type boiler.",
journal = "Asia-Pacific Journal of Chemical Engineering",
title = "Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler",
volume = "16",
number = "3",
pages = "e2631",
doi = "10.1002/apj.2631"
}

Deng, L., Zhang, Y., Ma, S., Zhu, Z., Liu, H., Belošević, S., Tomanović, I.,& Che, D.. (2021). Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler. in Asia-Pacific Journal of Chemical Engineering, 16(3), e2631.
https://doi.org/10.1002/apj.2631

Deng L, Zhang Y, Ma S, Zhu Z, Liu H, Belošević S, Tomanović I, Che D. Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler. in Asia-Pacific Journal of Chemical Engineering. 2021;16(3):e2631.
doi:10.1002/apj.2631 .

Deng, Lei, Zhang, Yan, Ma, Shihao, Zhu, Zhengrong, Liu, Hu, Belošević, Srđan, Tomanović, Ivan, Che, Defu, "Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler" in Asia-Pacific Journal of Chemical Engineering, 16, no. 3 (2021):e2631,
https://doi.org/10.1002/apj.2631 . .

TY  - JOUR
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan D.
AU  - Stojanović, Andrijana D.
AU  - Tucaković, Dragan
AU  - Lei Deng
AU  - Che, Defu
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9916
AB  - The co-combustion of biomass and coal in a utility boiler could provide cleaner power production and ensure sustainable utilization of the solid fuels. This paper aims to numerically investigate complex processes in the tangentially-fired 900 MWth boiler furnace during direct co-firing of lignite and biomass with 10% thermal share of agricultural residues (wheat straw, corn straw and soybean straw) under variable boiler loads (100%, 85% and 70%). Simulations are conducted by means of in-house developed computer code, supported by the specially designed user-friendly graphical interface. Co-firing of agricultural residues provides lower pollutant emissions, somewhat higher furnace exit gas temperature and increase in unburnt carbon in bottom/fly ash, compared to the lignite combustion without biomass. Soybean is found to be the most suitable for co-firing regarding its ash melting point, however due to its abundance and availability the wheat straw is selected for this study. Co-combustion at partial boiler loads results in reduction of NOx and SOx up to 34% and 9.5%, respectively. Burners arrangement and furnace aerodynamics affect the abatement of pollutants. This study may help the global efforts in fighting the climate change, efficiently and cost-effectively, thus offering considerable economic and social benefits.
T2  - International Journal of Heat and Mass Transfer
T1  - Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions
VL  - 181
SP  - 121728
DO  - 10.1016/j.ijheatmasstransfer.2021.121728
ER  - 

@article{
author = "Milićević, Aleksandar and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan D. and Stojanović, Andrijana D. and Tucaković, Dragan and Lei Deng and Che, Defu",
year = "2021",
abstract = "The co-combustion of biomass and coal in a utility boiler could provide cleaner power production and ensure sustainable utilization of the solid fuels. This paper aims to numerically investigate complex processes in the tangentially-fired 900 MWth boiler furnace during direct co-firing of lignite and biomass with 10% thermal share of agricultural residues (wheat straw, corn straw and soybean straw) under variable boiler loads (100%, 85% and 70%). Simulations are conducted by means of in-house developed computer code, supported by the specially designed user-friendly graphical interface. Co-firing of agricultural residues provides lower pollutant emissions, somewhat higher furnace exit gas temperature and increase in unburnt carbon in bottom/fly ash, compared to the lignite combustion without biomass. Soybean is found to be the most suitable for co-firing regarding its ash melting point, however due to its abundance and availability the wheat straw is selected for this study. Co-combustion at partial boiler loads results in reduction of NOx and SOx up to 34% and 9.5%, respectively. Burners arrangement and furnace aerodynamics affect the abatement of pollutants. This study may help the global efforts in fighting the climate change, efficiently and cost-effectively, thus offering considerable economic and social benefits.",
journal = "International Journal of Heat and Mass Transfer",
title = "Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions",
volume = "181",
pages = "121728",
doi = "10.1016/j.ijheatmasstransfer.2021.121728"
}

Milićević, A., Belošević, S., Crnomarković, N. Đ., Tomanović, I. D., Stojanović, A. D., Tucaković, D., Lei Deng,& Che, D.. (2021). Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions. in International Journal of Heat and Mass Transfer, 181, 121728.
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121728

Milićević A, Belošević S, Crnomarković NĐ, Tomanović ID, Stojanović AD, Tucaković D, Lei Deng, Che D. Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions. in International Journal of Heat and Mass Transfer. 2021;181:121728.
doi:10.1016/j.ijheatmasstransfer.2021.121728 .

Milićević, Aleksandar, Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan D., Stojanović, Andrijana D., Tucaković, Dragan, Lei Deng, Che, Defu, "Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions" in International Journal of Heat and Mass Transfer, 181 (2021):121728,
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121728 . .

TY  - JOUR
AU  - Stojanović, Andrijana D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan
AU  - Milićević, Aleksandar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10276
AB  - Due to extensive research efforts within the past thirty years, the mechanisms by which bubbles transfer energy during pool boiling are relatively well understood and have various applications in reactors, rockets, distillation, air separation, refrigeration and power cycles. In this paper, CFD analysis of heat transfer characteristics in nucleate pool boiling of saturated water in atmospheric conditions is performed in order to find out the influence of heat flux intensity on pool boiling dynamics. The investigation is carried out for four cases of different heat flux intensities and obtained results for velocity fields of liquid and void fractions are discussed. Grid independent test is also performed to improve the accuracy of calculation. In this way, complete picture of two-phase mixture behaviour on heated wall is represented.
T2  - Journal of the Serbian Society for Computational Mechanics
T1  - Heat Transfer to a Boiling Liquid – Numerical Study
VL  - 15
IS  - 1
SP  - 177
EP  - 185
DO  - 10.24874/jsscm.2021.15.01.12
ER  - 

@article{
author = "Stojanović, Andrijana D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan and Milićević, Aleksandar",
year = "2021",
abstract = "Due to extensive research efforts within the past thirty years, the mechanisms by which bubbles transfer energy during pool boiling are relatively well understood and have various applications in reactors, rockets, distillation, air separation, refrigeration and power cycles. In this paper, CFD analysis of heat transfer characteristics in nucleate pool boiling of saturated water in atmospheric conditions is performed in order to find out the influence of heat flux intensity on pool boiling dynamics. The investigation is carried out for four cases of different heat flux intensities and obtained results for velocity fields of liquid and void fractions are discussed. Grid independent test is also performed to improve the accuracy of calculation. In this way, complete picture of two-phase mixture behaviour on heated wall is represented.",
journal = "Journal of the Serbian Society for Computational Mechanics",
title = "Heat Transfer to a Boiling Liquid – Numerical Study",
volume = "15",
number = "1",
pages = "177-185",
doi = "10.24874/jsscm.2021.15.01.12"
}

Stojanović, A. D., Belošević, S., Crnomarković, N. Đ., Tomanović, I.,& Milićević, A.. (2021). Heat Transfer to a Boiling Liquid – Numerical Study. in Journal of the Serbian Society for Computational Mechanics, 15(1), 177-185.
https://doi.org/10.24874/jsscm.2021.15.01.12

Stojanović AD, Belošević S, Crnomarković NĐ, Tomanović I, Milićević A. Heat Transfer to a Boiling Liquid – Numerical Study. in Journal of the Serbian Society for Computational Mechanics. 2021;15(1):177-185.
doi:10.24874/jsscm.2021.15.01.12 .

Stojanović, Andrijana D., Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan, Milićević, Aleksandar, "Heat Transfer to a Boiling Liquid – Numerical Study" in Journal of the Serbian Society for Computational Mechanics, 15, no. 1 (2021):177-185,
https://doi.org/10.24874/jsscm.2021.15.01.12 . .

Crnomarković, N., Belošević, S., Tomanović, I., Milićević, A.,& Stojanović, A.. (2020). Numerički kod za korekciju emisivnosti površinskih zona Hottel-ovog zonalnog modela razmene toplote zračenjem u ložištu sa sagorevanjem ugljenog praha. in Institut za nuklearne nauke Vinča : Laboratorija za termotehniku i energetiku
Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča", Institut od nacionalnog značaja za Republiku Srbiju..
https://hdl.handle.net/21.15107/rcub_vinar_12290

Crnomarković N, Belošević S, Tomanović I, Milićević A, Stojanović A. Numerički kod za korekciju emisivnosti površinskih zona Hottel-ovog zonalnog modela razmene toplote zračenjem u ložištu sa sagorevanjem ugljenog praha. in Institut za nuklearne nauke Vinča : Laboratorija za termotehniku i energetiku. 2020;.
https://hdl.handle.net/21.15107/rcub_vinar_12290 .

Crnomarković, Nenad, Belošević, Srđan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana, "Numerički kod za korekciju emisivnosti površinskih zona Hottel-ovog zonalnog modela razmene toplote zračenjem u ložištu sa sagorevanjem ugljenog praha" in Institut za nuklearne nauke Vinča : Laboratorija za termotehniku i energetiku (2020),
https://hdl.handle.net/21.15107/rcub_vinar_12290 .

TY  - JOUR
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan D.
AU  - Tucaković, Dragan R.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8785
AB  - In this paper pulverised lignite-fired 350 MWe boiler furnace is selected for numerical simulations performed by using in-house developed computer code to deepen understanding of complex processes during direct co-firing with wheat straw. The CFD code is significantly upgraded to accommodate simulation of lignite and wheat straw particle reactions and interactions with gas phase, and to allow analysis of particle behavior under real conditions inside the furnace. Parametric analysis is done with emphasis on the thermal share, size and shape of biomass particle, method of biomass feeding into the furnace and the fuel distribution over the burner tiers. In the most favorable co-firing case (with 10% of wheat straw thermal ratio and particle diameter of 500 μm), the higher furnace exit gas temperature for 8 ˚C and lower NOx emission of 18.2% are achieved, compared with pure lignite combustion case. The optimal co-firing case provides relatively low percentage of wheat straw particles falling into the hopper (9.57%) and relatively high mass burnout of biomass particles at the furnace outlet (91.81%). Non-spherical shape of wheat straw particles is found to affect the fuel trajectories and flame significantly. The results of parametric analysis could support implementation of biomass co-firing technology in existing coal-fired power plants, to increase energy efficiency and mitigate environmental pollutants. © 2019 Elsevier Ltd
T2  - Applied Energy
T1  - Mathematical modelling and optimisation of lignite and wheat straw co-combustion in 350 MWe boiler furnace
VL  - 260
SP  - 114206
DO  - 10.1016/j.apenergy.2019.114206
ER  - 

@article{
author = "Milićević, Aleksandar and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan D. and Tucaković, Dragan R.",
year = "2020",
abstract = "In this paper pulverised lignite-fired 350 MWe boiler furnace is selected for numerical simulations performed by using in-house developed computer code to deepen understanding of complex processes during direct co-firing with wheat straw. The CFD code is significantly upgraded to accommodate simulation of lignite and wheat straw particle reactions and interactions with gas phase, and to allow analysis of particle behavior under real conditions inside the furnace. Parametric analysis is done with emphasis on the thermal share, size and shape of biomass particle, method of biomass feeding into the furnace and the fuel distribution over the burner tiers. In the most favorable co-firing case (with 10% of wheat straw thermal ratio and particle diameter of 500 μm), the higher furnace exit gas temperature for 8 ˚C and lower NOx emission of 18.2% are achieved, compared with pure lignite combustion case. The optimal co-firing case provides relatively low percentage of wheat straw particles falling into the hopper (9.57%) and relatively high mass burnout of biomass particles at the furnace outlet (91.81%). Non-spherical shape of wheat straw particles is found to affect the fuel trajectories and flame significantly. The results of parametric analysis could support implementation of biomass co-firing technology in existing coal-fired power plants, to increase energy efficiency and mitigate environmental pollutants. © 2019 Elsevier Ltd",
journal = "Applied Energy",
title = "Mathematical modelling and optimisation of lignite and wheat straw co-combustion in 350 MWe boiler furnace",
volume = "260",
pages = "114206",
doi = "10.1016/j.apenergy.2019.114206"
}

Milićević, A., Belošević, S., Crnomarković, N. Đ., Tomanović, I. D.,& Tucaković, D. R.. (2020). Mathematical modelling and optimisation of lignite and wheat straw co-combustion in 350 MWe boiler furnace. in Applied Energy, 260, 114206.
https://doi.org/10.1016/j.apenergy.2019.114206

Milićević A, Belošević S, Crnomarković NĐ, Tomanović ID, Tucaković DR. Mathematical modelling and optimisation of lignite and wheat straw co-combustion in 350 MWe boiler furnace. in Applied Energy. 2020;260:114206.
doi:10.1016/j.apenergy.2019.114206 .

Milićević, Aleksandar, Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan D., Tucaković, Dragan R., "Mathematical modelling and optimisation of lignite and wheat straw co-combustion in 350 MWe boiler furnace" in Applied Energy, 260 (2020):114206,
https://doi.org/10.1016/j.apenergy.2019.114206 . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Milićević, Aleksandar
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8744
AB  - New application method of the zonal model in numerical simulations of pulverized coal-fired furnaces, continual corrections of the total exchange areas (CCTEA), is presented. The method is based on the corrections of the surface–surface, surface–volume, and volume–volume total exchange areas according to the changes of the surface zone emissivities during the iterative calculation of the numerical simulation and summation rules of the total exchange areas, so that it provides zero radiative exchange in an isothermal system. The method was developed for the homogeneous and uniform flame radiative properties. The results obtained by the CCTEA method were compared with the results obtained by the previously developed repeated run of numerical simulation (RRNS) method, based on multiple succesive run of the numerical simulation. The differences of the result obtained by the methods were found for various conditions of numerical investigations: initial wall emissivity, total extinction coefficient, and thickness of the ash deposit layer. The gas-phase phase radiative properties were determined by the simple gray gas model and weighted sum of gray gases model. Investigation showed small differences of the results obtained by the methods and their sensitivity to conditions of numerical investigation. The CCTEA method is an improvement of the RRNS method as it provides almost the same results after the single run of the numerical simulation and reduces the computation time. © 2019 Elsevier Ltd
T2  - International Journal of Heat and Mass Transfer
T1  - New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas
VL  - 149
SP  - 119192
DO  - 10.1016/j.ijheatmasstransfer.2019.119192
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Belošević, Srđan and Tomanović, Ivan D. and Milićević, Aleksandar",
year = "2020",
abstract = "New application method of the zonal model in numerical simulations of pulverized coal-fired furnaces, continual corrections of the total exchange areas (CCTEA), is presented. The method is based on the corrections of the surface–surface, surface–volume, and volume–volume total exchange areas according to the changes of the surface zone emissivities during the iterative calculation of the numerical simulation and summation rules of the total exchange areas, so that it provides zero radiative exchange in an isothermal system. The method was developed for the homogeneous and uniform flame radiative properties. The results obtained by the CCTEA method were compared with the results obtained by the previously developed repeated run of numerical simulation (RRNS) method, based on multiple succesive run of the numerical simulation. The differences of the result obtained by the methods were found for various conditions of numerical investigations: initial wall emissivity, total extinction coefficient, and thickness of the ash deposit layer. The gas-phase phase radiative properties were determined by the simple gray gas model and weighted sum of gray gases model. Investigation showed small differences of the results obtained by the methods and their sensitivity to conditions of numerical investigation. The CCTEA method is an improvement of the RRNS method as it provides almost the same results after the single run of the numerical simulation and reduces the computation time. © 2019 Elsevier Ltd",
journal = "International Journal of Heat and Mass Transfer",
title = "New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas",
volume = "149",
pages = "119192",
doi = "10.1016/j.ijheatmasstransfer.2019.119192"
}

Crnomarković, N. Đ., Belošević, S., Tomanović, I. D.,& Milićević, A.. (2020). New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas. in International Journal of Heat and Mass Transfer, 149, 119192.
https://doi.org/10.1016/j.ijheatmasstransfer.2019.119192

Crnomarković NĐ, Belošević S, Tomanović ID, Milićević A. New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas. in International Journal of Heat and Mass Transfer. 2020;149:119192.
doi:10.1016/j.ijheatmasstransfer.2019.119192 .

Crnomarković, Nenad Đ., Belošević, Srđan, Tomanović, Ivan D., Milićević, Aleksandar, "New application method of the zonal model for simulations of pulverized coal-fired furnaces based on correction of total exchange areas" in International Journal of Heat and Mass Transfer, 149 (2020):119192,
https://doi.org/10.1016/j.ijheatmasstransfer.2019.119192 . .

TY  - JOUR
AU  - Tomanović, Ivan D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Milićević, Aleksandar
AU  - Tucaković, Dragan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9762
AB  - The furnace sorbent injection is analysed numerically, focusing on its behaviour, in order to estimate CaCO3 sorbent utilisation. Comprehensive presentation of numerical results and profound analysis are provided to better understand the process under realistic conditions. The boiler load reduction, varied between 70 and 100%, did not disturb the processes in furnace. Insight into individual trajectories and their overall sulphation reveal that reduced load, in these cases, yield somewhat better SO2 reduction. Reactivity of the sorbent particles was better with the boiler load reduction, especially for particles passing near the flame core. The calcination and sulphation of sorbent particles increase with the boiler load decrease, due to the combined influence of extended particle residence time and more favourable reaction conditions. Thus the boiler load reduction can lead to better particle utilisation and higher SO2 capture. The conclusions are limited to the case-study conditions and impose the need for further investigation. Copyright © 2020 Inderscience Enterprises Ltd.
T2  - International Journal of Global Warming
T1  - Prediction of calcination and sulphation along the sorbent particle trajectories for desulphurisation in coal-fired furnace
VL  - 22
IS  - 4
SP  - 459
EP  - 482
DO  - 10.1504/IJGW.2020.111520
ER  - 

@article{
author = "Tomanović, Ivan D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Milićević, Aleksandar and Tucaković, Dragan",
year = "2020",
abstract = "The furnace sorbent injection is analysed numerically, focusing on its behaviour, in order to estimate CaCO3 sorbent utilisation. Comprehensive presentation of numerical results and profound analysis are provided to better understand the process under realistic conditions. The boiler load reduction, varied between 70 and 100%, did not disturb the processes in furnace. Insight into individual trajectories and their overall sulphation reveal that reduced load, in these cases, yield somewhat better SO2 reduction. Reactivity of the sorbent particles was better with the boiler load reduction, especially for particles passing near the flame core. The calcination and sulphation of sorbent particles increase with the boiler load decrease, due to the combined influence of extended particle residence time and more favourable reaction conditions. Thus the boiler load reduction can lead to better particle utilisation and higher SO2 capture. The conclusions are limited to the case-study conditions and impose the need for further investigation. Copyright © 2020 Inderscience Enterprises Ltd.",
journal = "International Journal of Global Warming",
title = "Prediction of calcination and sulphation along the sorbent particle trajectories for desulphurisation in coal-fired furnace",
volume = "22",
number = "4",
pages = "459-482",
doi = "10.1504/IJGW.2020.111520"
}

Tomanović, I. D., Belošević, S., Crnomarković, N. Đ., Milićević, A.,& Tucaković, D.. (2020). Prediction of calcination and sulphation along the sorbent particle trajectories for desulphurisation in coal-fired furnace. in International Journal of Global Warming, 22(4), 459-482.
https://doi.org/10.1504/IJGW.2020.111520

Tomanović ID, Belošević S, Crnomarković NĐ, Milićević A, Tucaković D. Prediction of calcination and sulphation along the sorbent particle trajectories for desulphurisation in coal-fired furnace. in International Journal of Global Warming. 2020;22(4):459-482.
doi:10.1504/IJGW.2020.111520 .

Tomanović, Ivan D., Belošević, Srđan, Crnomarković, Nenad Đ., Milićević, Aleksandar, Tucaković, Dragan, "Prediction of calcination and sulphation along the sorbent particle trajectories for desulphurisation in coal-fired furnace" in International Journal of Global Warming, 22, no. 4 (2020):459-482,
https://doi.org/10.1504/IJGW.2020.111520 . .

TY  - JOUR
AU  - Repić, Branislav
AU  - Stefanović, Predrag Lj.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Oka, Simeon N.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8946
AB  - The paper presents an overview of the results of the investigations of the process-es that take place in pulverized coal combustion boilers and power plants which, in a longer period of time, were realized in the Laboratory for Thermal Engineer-ing and Energy of the "Vinca" Institute of Nuclear Sciences. The presented re-sults were published in numerous studies realized for different users, Ph. D., M. Sc., and specialist thesis, in international and domestic scientific journals and monographs, presented at numerous international and domestic scientific meet-ings, etc. The main goal of the paper is to chronologically present the results of domestic research that at one time were at an enviable international level, with concrete practical applications for domestic users. This is especially important to contrast the present situation when domestic research in this area is scarce and when the energy sector relies practically only on imported technologies and for-eign consultancy. © 2019 Society of Thermal Engineers of Serbia.
T2  - Thermal Science
T1  - Review of the investigations of pulverized coal combustion processes in large power plants in laboratory for thermal engineering and energy-Part A
VL  - 23
IS  - Suppl. 5
SP  - S1587
EP  - S1609
DO  - 10.2298/TSCI191030443R
ER  - 

@article{
author = "Repić, Branislav and Stefanović, Predrag Lj. and Belošević, Srđan and Crnomarković, Nenad Đ. and Oka, Simeon N.",
year = "2019",
abstract = "The paper presents an overview of the results of the investigations of the process-es that take place in pulverized coal combustion boilers and power plants which, in a longer period of time, were realized in the Laboratory for Thermal Engineer-ing and Energy of the "Vinca" Institute of Nuclear Sciences. The presented re-sults were published in numerous studies realized for different users, Ph. D., M. Sc., and specialist thesis, in international and domestic scientific journals and monographs, presented at numerous international and domestic scientific meet-ings, etc. The main goal of the paper is to chronologically present the results of domestic research that at one time were at an enviable international level, with concrete practical applications for domestic users. This is especially important to contrast the present situation when domestic research in this area is scarce and when the energy sector relies practically only on imported technologies and for-eign consultancy. © 2019 Society of Thermal Engineers of Serbia.",
journal = "Thermal Science",
title = "Review of the investigations of pulverized coal combustion processes in large power plants in laboratory for thermal engineering and energy-Part A",
volume = "23",
number = "Suppl. 5",
pages = "S1587-S1609",
doi = "10.2298/TSCI191030443R"
}

Repić, B., Stefanović, P. Lj., Belošević, S., Crnomarković, N. Đ.,& Oka, S. N.. (2019). Review of the investigations of pulverized coal combustion processes in large power plants in laboratory for thermal engineering and energy-Part A. in Thermal Science, 23(Suppl. 5), S1587-S1609.
https://doi.org/10.2298/TSCI191030443R

Repić B, Stefanović PL, Belošević S, Crnomarković NĐ, Oka SN. Review of the investigations of pulverized coal combustion processes in large power plants in laboratory for thermal engineering and energy-Part A. in Thermal Science. 2019;23(Suppl. 5):S1587-S1609.
doi:10.2298/TSCI191030443R .

Repić, Branislav, Stefanović, Predrag Lj., Belošević, Srđan, Crnomarković, Nenad Đ., Oka, Simeon N., "Review of the investigations of pulverized coal combustion processes in large power plants in laboratory for thermal engineering and energy-Part A" in Thermal Science, 23, no. Suppl. 5 (2019):S1587-S1609,
https://doi.org/10.2298/TSCI191030443R . .

TY  - JOUR
AU  - Tomanović, Ivan D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Milićević, Aleksandar
AU  - Tucaković, Dragan R.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0017931018333271
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7866
AB  - Results of the study on SO2 reduction in a utility boiler furnace by means of furnace sorbent injection are presented in this paper with analysis of major influential parameters. The Ca-based sorbent injection process in pulverized lignite fired boiler furnace with tangentially arranged burners is simulated. In simulations sorbent particles are distributed among the burner tiers, where they are injected together with coal, and also through sorbent injection ports located above the burners. The sorbent reactions model was adapted to be efficiently implemented in the code for CFD simulations of complex processes considering both the calculation time and the results accuracy. The sorbent particles reaction model was simplified with several assumptions to allow for faster calculations and significantly reduce simulation time without loss in calculation precision during the particle tracking in boiler furnace. Two phase gas-particle flow is modeled, with coal and sorbent particles reactions and interactions with gaseous phase. Test-cases based on fuels with different composition and combustion organization were simulated in details, and results showed that significant increase in reduction of SO2 at furnace exit could be achieved by proper sorbent injection. The sorbent injection locations were analyzed with special care to enable maximum SO2 capture in the case-study furnace under investigated conditions. Most of the test-cases with low SO2 capture had one or more of the following problems: intensive particle sintering, low local temperatures (leading to low calcination rates), or bad particles distribution. Significant SO2 retention was possible when the process was organized in such a way that particles were exposed to optimal temperature range, and injected in the furnace zones with high SO2 concentration simultaneously. It was shown that better results can be achieved by injection of sorbent through multiple burner tiers, with SO2 emission reduction efficiency around 60% at the furnace exit in several well optimized test-cases. © 2018 Elsevier Ltd
T2  - International Journal of Heat and Mass Transfer
T1  - Numerical modeling of in-furnace sulfur removal by sorbent injection during pulverized lignite combustion
VL  - 128
SP  - 98
EP  - 114
DO  - 10.1016/j.ijheatmasstransfer.2018.08.129
ER  - 

@article{
author = "Tomanović, Ivan D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Milićević, Aleksandar and Tucaković, Dragan R.",
year = "2019",
abstract = "Results of the study on SO2 reduction in a utility boiler furnace by means of furnace sorbent injection are presented in this paper with analysis of major influential parameters. The Ca-based sorbent injection process in pulverized lignite fired boiler furnace with tangentially arranged burners is simulated. In simulations sorbent particles are distributed among the burner tiers, where they are injected together with coal, and also through sorbent injection ports located above the burners. The sorbent reactions model was adapted to be efficiently implemented in the code for CFD simulations of complex processes considering both the calculation time and the results accuracy. The sorbent particles reaction model was simplified with several assumptions to allow for faster calculations and significantly reduce simulation time without loss in calculation precision during the particle tracking in boiler furnace. Two phase gas-particle flow is modeled, with coal and sorbent particles reactions and interactions with gaseous phase. Test-cases based on fuels with different composition and combustion organization were simulated in details, and results showed that significant increase in reduction of SO2 at furnace exit could be achieved by proper sorbent injection. The sorbent injection locations were analyzed with special care to enable maximum SO2 capture in the case-study furnace under investigated conditions. Most of the test-cases with low SO2 capture had one or more of the following problems: intensive particle sintering, low local temperatures (leading to low calcination rates), or bad particles distribution. Significant SO2 retention was possible when the process was organized in such a way that particles were exposed to optimal temperature range, and injected in the furnace zones with high SO2 concentration simultaneously. It was shown that better results can be achieved by injection of sorbent through multiple burner tiers, with SO2 emission reduction efficiency around 60% at the furnace exit in several well optimized test-cases. © 2018 Elsevier Ltd",
journal = "International Journal of Heat and Mass Transfer",
title = "Numerical modeling of in-furnace sulfur removal by sorbent injection during pulverized lignite combustion",
volume = "128",
pages = "98-114",
doi = "10.1016/j.ijheatmasstransfer.2018.08.129"
}

Tomanović, I. D., Belošević, S., Crnomarković, N. Đ., Milićević, A.,& Tucaković, D. R.. (2019). Numerical modeling of in-furnace sulfur removal by sorbent injection during pulverized lignite combustion. in International Journal of Heat and Mass Transfer, 128, 98-114.
https://doi.org/10.1016/j.ijheatmasstransfer.2018.08.129

Tomanović ID, Belošević S, Crnomarković NĐ, Milićević A, Tucaković DR. Numerical modeling of in-furnace sulfur removal by sorbent injection during pulverized lignite combustion. in International Journal of Heat and Mass Transfer. 2019;128:98-114.
doi:10.1016/j.ijheatmasstransfer.2018.08.129 .

Tomanović, Ivan D., Belošević, Srđan, Crnomarković, Nenad Đ., Milićević, Aleksandar, Tucaković, Dragan R., "Numerical modeling of in-furnace sulfur removal by sorbent injection during pulverized lignite combustion" in International Journal of Heat and Mass Transfer, 128 (2019):98-114,
https://doi.org/10.1016/j.ijheatmasstransfer.2018.08.129 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Crnomarković, Nenad Đ.
AU  - Milićević, Aleksandar
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0360544219309351
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8212
AB  - Investigations suggest the need for better understanding of reactive gas-particle turbulent flow phenomena in full-scale energy systems. Numerical study was done in 350 MWe utility boiler tangentially fired furnace to clarify selected issues, such as turbulence modulation, particles dispersion, energy transfer between phases, combustion process and flame, by using an in-house developed combustion code. Numerical experiments demonstrated remarkable complexity of flow and interphase exchange. Maximal decrease in average turbulence kinetic energy of 33% due to dispersed phase was predicted for representative monodispersed coal; augmentation obtained for large particles could become attenuation due to the particles size change during combustion. Grinding fineness of polydispersed coal affected the flow, combustion and flame considerably. Fine grinding (R90 = 48.40%) provided ascending flame, higher furnace exit temperature and decrease in turbulence energy, compared with coarse grinding (R90 = 73.85%). Combustion of each particle size class of coal is completed at different vertical levels, influencing the flame position. Diagrams based on numerical predictions were proposed to enable efficient estimations of combustion and flame characteristics in the case-study furnace, for various coal qualities and mass fractions and changed distributions of coal particle size classes over the burner tiers, while necessity for further investigation was pointed out as well. © 2019 Elsevier Ltd
T2  - Energy
T1  - Full-scale CFD investigation of gas-particle flow, interactions and combustion in tangentially fired pulverized coal furnace
VL  - 179
SP  - 1036
EP  - 1053
DO  - 10.1016/j.energy.2019.05.066
ER  - 

@article{
author = "Belošević, Srđan and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Milićević, Aleksandar",
year = "2019",
abstract = "Investigations suggest the need for better understanding of reactive gas-particle turbulent flow phenomena in full-scale energy systems. Numerical study was done in 350 MWe utility boiler tangentially fired furnace to clarify selected issues, such as turbulence modulation, particles dispersion, energy transfer between phases, combustion process and flame, by using an in-house developed combustion code. Numerical experiments demonstrated remarkable complexity of flow and interphase exchange. Maximal decrease in average turbulence kinetic energy of 33% due to dispersed phase was predicted for representative monodispersed coal; augmentation obtained for large particles could become attenuation due to the particles size change during combustion. Grinding fineness of polydispersed coal affected the flow, combustion and flame considerably. Fine grinding (R90 = 48.40%) provided ascending flame, higher furnace exit temperature and decrease in turbulence energy, compared with coarse grinding (R90 = 73.85%). Combustion of each particle size class of coal is completed at different vertical levels, influencing the flame position. Diagrams based on numerical predictions were proposed to enable efficient estimations of combustion and flame characteristics in the case-study furnace, for various coal qualities and mass fractions and changed distributions of coal particle size classes over the burner tiers, while necessity for further investigation was pointed out as well. © 2019 Elsevier Ltd",
journal = "Energy",
title = "Full-scale CFD investigation of gas-particle flow, interactions and combustion in tangentially fired pulverized coal furnace",
volume = "179",
pages = "1036-1053",
doi = "10.1016/j.energy.2019.05.066"
}

Belošević, S., Tomanović, I. D., Crnomarković, N. Đ.,& Milićević, A.. (2019). Full-scale CFD investigation of gas-particle flow, interactions and combustion in tangentially fired pulverized coal furnace. in Energy, 179, 1036-1053.
https://doi.org/10.1016/j.energy.2019.05.066

Belošević S, Tomanović ID, Crnomarković NĐ, Milićević A. Full-scale CFD investigation of gas-particle flow, interactions and combustion in tangentially fired pulverized coal furnace. in Energy. 2019;179:1036-1053.
doi:10.1016/j.energy.2019.05.066 .

Belošević, Srđan, Tomanović, Ivan D., Crnomarković, Nenad Đ., Milićević, Aleksandar, "Full-scale CFD investigation of gas-particle flow, interactions and combustion in tangentially fired pulverized coal furnace" in Energy, 179 (2019):1036-1053,
https://doi.org/10.1016/j.energy.2019.05.066 . .

TY  - JOUR
AU  - Stupar, Goran
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
AU  - Stevanović, Žarko M.
AU  - Belošević, Srđan
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S135943111737196X
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8000
AB  - The results of an extended research performed with the aim of investigating influence air staging application on processes occurred in boiler furnace have been presented in this paper. This subject was developed as a result of the need to obtain valid engineering methods for estimating the intensity of combustion and heat transfer processes under sub-stoichiometric conditions. The used calculation method, presented in previous publications, has been established by linking the differential mathematical model of processes in the furnace and conventional integral calculation procedures of all heating surfaces within the boiler. Such verified calculation method provided the algorithm for qualitative analysis of steam boiler operation regardless of the applied combustion scheme. In this research, by use of such approach, the operation of power boiler within TPP Kostolac has been assessed where combustion system was reconstructed during 2015. Calculation results in case of application of designed combustion system (UNR) and alternative air staging configuration (TC1) have been considered. In addition, the present air distribution scheme with the applied primary measures (R) has been analyzed. Comparison of such gained results listed in the same table ensures the trend of the change occurred by application of the air-staging system which needs to be more closely defined. Results of research showed that air staging throughout the furnace height slows down the combustion with the simultaneous intensification of the heat transfer process. Although this phenomenon led to the reduction in NOx concentration (195/470 mg/Nm3, dry, 6% O2), it decreased the power of considered boiler (725.5/774.0 MW) and increased boiler's efficiency (86.49/85.52%). Furthermore, due to the temperatures of superheated (517.0/540.0 °C) and reheated (524.0/540.0 °C) steam being below the designed level, the safety of the boiler's operation was significantly affected. The study also reveals that the boiler's efficiency rate is, in any considered case with applied air staging system, higher due to the possibility to run the boiler with the lower value of excess air ratio (1.15/1.22). Additionally, results demonstrate that distribution of the amount of air, as well as air introduction location, can significantly influence parameters of superheated and reheated steam as well as the regulation area of the same. © 2018 Elsevier Ltd
T2  - Applied Thermal Engineering
T1  - Predicting effects of air staging application on existing coal-fired power steam boiler
VL  - 149
SP  - 665
EP  - 677
DO  - 10.1016/j.applthermaleng.2018.12.070
ER  - 

@article{
author = "Stupar, Goran and Tucaković, Dragan R. and Živanović, Titoslav and Stevanović, Žarko M. and Belošević, Srđan",
year = "2019",
abstract = "The results of an extended research performed with the aim of investigating influence air staging application on processes occurred in boiler furnace have been presented in this paper. This subject was developed as a result of the need to obtain valid engineering methods for estimating the intensity of combustion and heat transfer processes under sub-stoichiometric conditions. The used calculation method, presented in previous publications, has been established by linking the differential mathematical model of processes in the furnace and conventional integral calculation procedures of all heating surfaces within the boiler. Such verified calculation method provided the algorithm for qualitative analysis of steam boiler operation regardless of the applied combustion scheme. In this research, by use of such approach, the operation of power boiler within TPP Kostolac has been assessed where combustion system was reconstructed during 2015. Calculation results in case of application of designed combustion system (UNR) and alternative air staging configuration (TC1) have been considered. In addition, the present air distribution scheme with the applied primary measures (R) has been analyzed. Comparison of such gained results listed in the same table ensures the trend of the change occurred by application of the air-staging system which needs to be more closely defined. Results of research showed that air staging throughout the furnace height slows down the combustion with the simultaneous intensification of the heat transfer process. Although this phenomenon led to the reduction in NOx concentration (195/470 mg/Nm3, dry, 6% O2), it decreased the power of considered boiler (725.5/774.0 MW) and increased boiler's efficiency (86.49/85.52%). Furthermore, due to the temperatures of superheated (517.0/540.0 °C) and reheated (524.0/540.0 °C) steam being below the designed level, the safety of the boiler's operation was significantly affected. The study also reveals that the boiler's efficiency rate is, in any considered case with applied air staging system, higher due to the possibility to run the boiler with the lower value of excess air ratio (1.15/1.22). Additionally, results demonstrate that distribution of the amount of air, as well as air introduction location, can significantly influence parameters of superheated and reheated steam as well as the regulation area of the same. © 2018 Elsevier Ltd",
journal = "Applied Thermal Engineering",
title = "Predicting effects of air staging application on existing coal-fired power steam boiler",
volume = "149",
pages = "665-677",
doi = "10.1016/j.applthermaleng.2018.12.070"
}

Stupar, G., Tucaković, D. R., Živanović, T., Stevanović, Ž. M.,& Belošević, S.. (2019). Predicting effects of air staging application on existing coal-fired power steam boiler. in Applied Thermal Engineering, 149, 665-677.
https://doi.org/10.1016/j.applthermaleng.2018.12.070

Stupar G, Tucaković DR, Živanović T, Stevanović ŽM, Belošević S. Predicting effects of air staging application on existing coal-fired power steam boiler. in Applied Thermal Engineering. 2019;149:665-677.
doi:10.1016/j.applthermaleng.2018.12.070 .

Stupar, Goran, Tucaković, Dragan R., Živanović, Titoslav, Stevanović, Žarko M., Belošević, Srđan, "Predicting effects of air staging application on existing coal-fired power steam boiler" in Applied Thermal Engineering, 149 (2019):665-677,
https://doi.org/10.1016/j.applthermaleng.2018.12.070 . .

TY  - JOUR
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Crnomarković, Nenad Đ.
AU  - Tucaković, Dragan R.
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0354-98361700206M
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7628
AB  - A comprehensive mathematical model for prediction of turbulent transport processes and reactions during co-combustion of pulverized fuels in furnace fired by 150 kW swirl stabilized-burner has been developed. Numerical simulations have been carried out by using an in-house developed computer code, with Euler-Lagrangian approach to the two-phase flow modelling and sub-models for individual phases during complex combustion process: evaporation, devolatilization, combustion of volatiles, and char combustion. For sub-model of coal devolatilization the approach of Merrick is adopted, while for biomass devolatilization the combination models of Merrick, and of Xu and Tomita are selected. Products of devolatilization of both the pulverized coal and biomass are considered to contain the primary gaseous volatiles and tar, which further decomposes to secondary gaseous volatiles and residual soot. The residual soot in tar and carbon in coal and biomass char are oxidized directly, with ash remaining. For volatiles combustion the finite rate/eddy break-up model is chosen, while for char oxidation the combined kinetic-diffusion model is used. The comprehensive combustion model is validated against available experimental data from the case-study cylindrical furnace. The agreement of the simulations with the data for the main species in the furnace is quite good, while some discrepancies from experimental values are found in the core zone. The presented model is a good basis for further research of co-combustion processes and is able to provide analysis of wide range of pulverized fuels, i. e. coal and biomass. At the same time, the model is relatively simple numerical tool for effective and practical use.
T2  - Thermal Science
T1  - Development of mathematical model for co-firing pulverized coal and biomass in experimental furnace
VL  - 22
IS  - 1 (Part B)
SP  - 709
EP  - 719
DO  - 10.2298/TSCI170525206M
ER  - 

@article{
author = "Milićević, Aleksandar and Belošević, Srđan and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Tucaković, Dragan R.",
year = "2018",
abstract = "A comprehensive mathematical model for prediction of turbulent transport processes and reactions during co-combustion of pulverized fuels in furnace fired by 150 kW swirl stabilized-burner has been developed. Numerical simulations have been carried out by using an in-house developed computer code, with Euler-Lagrangian approach to the two-phase flow modelling and sub-models for individual phases during complex combustion process: evaporation, devolatilization, combustion of volatiles, and char combustion. For sub-model of coal devolatilization the approach of Merrick is adopted, while for biomass devolatilization the combination models of Merrick, and of Xu and Tomita are selected. Products of devolatilization of both the pulverized coal and biomass are considered to contain the primary gaseous volatiles and tar, which further decomposes to secondary gaseous volatiles and residual soot. The residual soot in tar and carbon in coal and biomass char are oxidized directly, with ash remaining. For volatiles combustion the finite rate/eddy break-up model is chosen, while for char oxidation the combined kinetic-diffusion model is used. The comprehensive combustion model is validated against available experimental data from the case-study cylindrical furnace. The agreement of the simulations with the data for the main species in the furnace is quite good, while some discrepancies from experimental values are found in the core zone. The presented model is a good basis for further research of co-combustion processes and is able to provide analysis of wide range of pulverized fuels, i. e. coal and biomass. At the same time, the model is relatively simple numerical tool for effective and practical use.",
journal = "Thermal Science",
title = "Development of mathematical model for co-firing pulverized coal and biomass in experimental furnace",
volume = "22",
number = "1 (Part B)",
pages = "709-719",
doi = "10.2298/TSCI170525206M"
}

Milićević, A., Belošević, S., Tomanović, I. D., Crnomarković, N. Đ.,& Tucaković, D. R.. (2018). Development of mathematical model for co-firing pulverized coal and biomass in experimental furnace. in Thermal Science, 22(1 (Part B)), 709-719.
https://doi.org/10.2298/TSCI170525206M

Milićević A, Belošević S, Tomanović ID, Crnomarković NĐ, Tucaković DR. Development of mathematical model for co-firing pulverized coal and biomass in experimental furnace. in Thermal Science. 2018;22(1 (Part B)):709-719.
doi:10.2298/TSCI170525206M .

Milićević, Aleksandar, Belošević, Srđan, Tomanović, Ivan D., Crnomarković, Nenad Đ., Tucaković, Dragan R., "Development of mathematical model for co-firing pulverized coal and biomass in experimental furnace" in Thermal Science, 22, no. 1 (Part B) (2018):709-719,
https://doi.org/10.2298/TSCI170525206M . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Belošević, Srđan
AU  - Nemoda, Stevan
AU  - Tomanović, Ivan D.
AU  - Milićević, Aleksandar
PY  - 2018
UR  - http://casopisi.junis.ni.ac.rs/index.php/FUMechEng/article/view/3683
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7820
AB  - Determination of the wall variables (wall emissivities, wall temperatures, and heat fluxes) when the zonal model of radiation is used in numerical simulations of processes inside a pulverized coal-fired furnaces is described. Two methods for determination of the wall variables, i.e., a repeated run of numerical simulation (RRNS) and a temporary correction of the total exchange areas (TCTEA) are compared. Investigation was carried out for three values of the flame total extinction coefficient and four values of the initial wall emissivities. Differences of the wall variables were determined using the arithmetic means (AMs) of the relative differences. The AMs of the relative differences of the wall variables increased with an increase in the flame total extinction coefficient and changed a little with an increase in the initial values of the wall emissivities. For the selected furnace, the smallest differences of the wall variables were obtained for Kt=0.3 m-1 and ew,in=0.7. Although both methods can be used for determination of the wall variables, the RRNS method was recommended because the manipulation with files was easier for it. mmended because the manipulation with files was easier for it.
T2  - Facta Universitatis, Series: Mechanical Engineering
T1  - Determination of the wall variables within the zonal model of radiation inside a pulverized coal-fired furnace
VL  - 16
IS  - 2
SP  - 219
EP  - 232
DO  - 10.22190/FUME180227021C
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Belošević, Srđan and Nemoda, Stevan and Tomanović, Ivan D. and Milićević, Aleksandar",
year = "2018",
abstract = "Determination of the wall variables (wall emissivities, wall temperatures, and heat fluxes) when the zonal model of radiation is used in numerical simulations of processes inside a pulverized coal-fired furnaces is described. Two methods for determination of the wall variables, i.e., a repeated run of numerical simulation (RRNS) and a temporary correction of the total exchange areas (TCTEA) are compared. Investigation was carried out for three values of the flame total extinction coefficient and four values of the initial wall emissivities. Differences of the wall variables were determined using the arithmetic means (AMs) of the relative differences. The AMs of the relative differences of the wall variables increased with an increase in the flame total extinction coefficient and changed a little with an increase in the initial values of the wall emissivities. For the selected furnace, the smallest differences of the wall variables were obtained for Kt=0.3 m-1 and ew,in=0.7. Although both methods can be used for determination of the wall variables, the RRNS method was recommended because the manipulation with files was easier for it. mmended because the manipulation with files was easier for it.",
journal = "Facta Universitatis, Series: Mechanical Engineering",
title = "Determination of the wall variables within the zonal model of radiation inside a pulverized coal-fired furnace",
volume = "16",
number = "2",
pages = "219-232",
doi = "10.22190/FUME180227021C"
}

Crnomarković, N. Đ., Belošević, S., Nemoda, S., Tomanović, I. D.,& Milićević, A.. (2018). Determination of the wall variables within the zonal model of radiation inside a pulverized coal-fired furnace. in Facta Universitatis, Series: Mechanical Engineering, 16(2), 219-232.
https://doi.org/10.22190/FUME180227021C

Crnomarković NĐ, Belošević S, Nemoda S, Tomanović ID, Milićević A. Determination of the wall variables within the zonal model of radiation inside a pulverized coal-fired furnace. in Facta Universitatis, Series: Mechanical Engineering. 2018;16(2):219-232.
doi:10.22190/FUME180227021C .

Crnomarković, Nenad Đ., Belošević, Srđan, Nemoda, Stevan, Tomanović, Ivan D., Milićević, Aleksandar, "Determination of the wall variables within the zonal model of radiation inside a pulverized coal-fired furnace" in Facta Universitatis, Series: Mechanical Engineering, 16, no. 2 (2018):219-232,
https://doi.org/10.22190/FUME180227021C . .

TY  - JOUR
AU  - Tomanović, Ivan D.
AU  - Belošević, Srđan
AU  - Milićević, Aleksandar
AU  - Crnomarković, Nenad Đ.
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0367-598X1800025T
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8109
AB  - Several models considering the pulverized sorbent reactions with pollutant gases were developed over the past years. In this paper, we present a detailed overview of available models for direct furnace injection of pulverized calcium sorbent suitable for potential application in CFD codes, with respect to implementation difficulty and computational resources demand. Depending on the model, variations in result accuracy, data output, and computational power required may occur. Some authors separate the model of calcination reaction, combined with the sintering model, and afterwards model the sulfation. Other authors assume the calcination to be instantaneous, and focus the modelling efforts toward the sulfation reaction, adding the sintering effects as a parameter in the efficiency coefficient. Simple models quantify the reaction effects, while more complex models attempt to describe and explain internal particle reactions through different approaches to modelling of the particle internal structure.
T2  - Hemijska industrija
T1  - Calcium based sorbent calcination and sintering reaction models overview
VL  - 72
IS  - 6
SP  - 329
EP  - 339
DO  - 10.2298/HEMIND180703025T
ER  - 

@article{
author = "Tomanović, Ivan D. and Belošević, Srđan and Milićević, Aleksandar and Crnomarković, Nenad Đ.",
year = "2018",
abstract = "Several models considering the pulverized sorbent reactions with pollutant gases were developed over the past years. In this paper, we present a detailed overview of available models for direct furnace injection of pulverized calcium sorbent suitable for potential application in CFD codes, with respect to implementation difficulty and computational resources demand. Depending on the model, variations in result accuracy, data output, and computational power required may occur. Some authors separate the model of calcination reaction, combined with the sintering model, and afterwards model the sulfation. Other authors assume the calcination to be instantaneous, and focus the modelling efforts toward the sulfation reaction, adding the sintering effects as a parameter in the efficiency coefficient. Simple models quantify the reaction effects, while more complex models attempt to describe and explain internal particle reactions through different approaches to modelling of the particle internal structure.",
journal = "Hemijska industrija",
title = "Calcium based sorbent calcination and sintering reaction models overview",
volume = "72",
number = "6",
pages = "329-339",
doi = "10.2298/HEMIND180703025T"
}

Tomanović, I. D., Belošević, S., Milićević, A.,& Crnomarković, N. Đ.. (2018). Calcium based sorbent calcination and sintering reaction models overview. in Hemijska industrija, 72(6), 329-339.
https://doi.org/10.2298/HEMIND180703025T

Tomanović ID, Belošević S, Milićević A, Crnomarković NĐ. Calcium based sorbent calcination and sintering reaction models overview. in Hemijska industrija. 2018;72(6):329-339.
doi:10.2298/HEMIND180703025T .

Tomanović, Ivan D., Belošević, Srđan, Milićević, Aleksandar, Crnomarković, Nenad Đ., "Calcium based sorbent calcination and sintering reaction models overview" in Hemijska industrija, 72, no. 6 (2018):329-339,
https://doi.org/10.2298/HEMIND180703025T . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Milićević, Aleksandar
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1822
AB  - The effects of the number of significant figures (NSF) in the interpolation polynomial coefficients (IPCs) of the weighted sum of gray gases model (WSGM) on results of numerical investigations and WSGM optimization were investigated. The investigation was conducted using numerical simulations of the processes inside a pulverized coal-fired furnace. The radiative properties of the gas phase were determined using the simple gray gas model (SG), two-term WSGM (W2), and three-term WSGM (W3). Ten sets of the IPCs with the same NSF were formed for every weighting coefficient in both W2 and W3. The average and maximal relative difference values of the flame temperatures, wall temperatures, and wall heat fluxes were determined. The investigation showed that the results of numerical investigations were affected by the NSF unless it exceeded certain value. The increase in the NSF did not necessarily lead to WSGM optimization. The combination of the NSF (CNSF) was the necessary requirement for WSGM optimization.
T2  - Journal of Thermal Science
T1  - Weighted Sum of Gray Gases Model Optimization for Numerical Investigations of Processes inside Pulverized Coal-Fired Furnaces
VL  - 26
IS  - 6
SP  - 552
EP  - 559
DO  - 10.1007/s11630-017-0973-0
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Belošević, Srđan and Tomanović, Ivan D. and Milićević, Aleksandar",
year = "2017",
abstract = "The effects of the number of significant figures (NSF) in the interpolation polynomial coefficients (IPCs) of the weighted sum of gray gases model (WSGM) on results of numerical investigations and WSGM optimization were investigated. The investigation was conducted using numerical simulations of the processes inside a pulverized coal-fired furnace. The radiative properties of the gas phase were determined using the simple gray gas model (SG), two-term WSGM (W2), and three-term WSGM (W3). Ten sets of the IPCs with the same NSF were formed for every weighting coefficient in both W2 and W3. The average and maximal relative difference values of the flame temperatures, wall temperatures, and wall heat fluxes were determined. The investigation showed that the results of numerical investigations were affected by the NSF unless it exceeded certain value. The increase in the NSF did not necessarily lead to WSGM optimization. The combination of the NSF (CNSF) was the necessary requirement for WSGM optimization.",
journal = "Journal of Thermal Science",
title = "Weighted Sum of Gray Gases Model Optimization for Numerical Investigations of Processes inside Pulverized Coal-Fired Furnaces",
volume = "26",
number = "6",
pages = "552-559",
doi = "10.1007/s11630-017-0973-0"
}

Crnomarković, N. Đ., Belošević, S., Tomanović, I. D.,& Milićević, A.. (2017). Weighted Sum of Gray Gases Model Optimization for Numerical Investigations of Processes inside Pulverized Coal-Fired Furnaces. in Journal of Thermal Science, 26(6), 552-559.
https://doi.org/10.1007/s11630-017-0973-0

Crnomarković NĐ, Belošević S, Tomanović ID, Milićević A. Weighted Sum of Gray Gases Model Optimization for Numerical Investigations of Processes inside Pulverized Coal-Fired Furnaces. in Journal of Thermal Science. 2017;26(6):552-559.
doi:10.1007/s11630-017-0973-0 .

Crnomarković, Nenad Đ., Belošević, Srđan, Tomanović, Ivan D., Milićević, Aleksandar, "Weighted Sum of Gray Gases Model Optimization for Numerical Investigations of Processes inside Pulverized Coal-Fired Furnaces" in Journal of Thermal Science, 26, no. 6 (2017):552-559,
https://doi.org/10.1007/s11630-017-0973-0 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Crnomarković, Nenad Đ.
AU  - Milićević, Aleksandar
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7187
AB  - A cost-effective reduction of NO, emission from utility boilers firing pulverized coal can be achieved by means of combustion modifications in the furnace. It is also essential to provide the pulverized coal dfffitsion flame control. Mathematical modeling is regularly used for analysis and optimization of complex turbulent reactive flows and mutually dependent processes in coal combustion furnaces. In the numerical study, predictions were performed by an in-house developed comprehensive three-dimensional differential model of flow, combustion and heat/mass transfer with submodel of the fuel- and thermal-NO formation/destruction reactions. Influence of various operating conditions in the case-study utility boiler tangentially fired furnace, such as distribution of both the fuel and the combustion air over the burners and tiers, fuel-bound nitrogen content and grinding fineness of coal were investigated individually and in combination. Mechanisms of NO formation and depletion were found to be strongly affected by flow, temperature and gas mixture components concentration fields. Proper modifications of combustion process can provide more than 30% of the NO, emission abatement, approaching the corresponding emission limits, with simultaneous control of the flame geometry and position within the furnace. This kind of complex numerical experiments provides conditions for improvements of the power plant furnaces exploitation, with respect to high efficiency, operation flexibility and low emission.
T2  - Thermal Science
T1  - Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control
VL  - 21
SP  - S597
EP  - S615
DO  - 10.2298/TSCI160604186B
ER  - 

@article{
author = "Belošević, Srđan and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Milićević, Aleksandar",
year = "2017",
abstract = "A cost-effective reduction of NO, emission from utility boilers firing pulverized coal can be achieved by means of combustion modifications in the furnace. It is also essential to provide the pulverized coal dfffitsion flame control. Mathematical modeling is regularly used for analysis and optimization of complex turbulent reactive flows and mutually dependent processes in coal combustion furnaces. In the numerical study, predictions were performed by an in-house developed comprehensive three-dimensional differential model of flow, combustion and heat/mass transfer with submodel of the fuel- and thermal-NO formation/destruction reactions. Influence of various operating conditions in the case-study utility boiler tangentially fired furnace, such as distribution of both the fuel and the combustion air over the burners and tiers, fuel-bound nitrogen content and grinding fineness of coal were investigated individually and in combination. Mechanisms of NO formation and depletion were found to be strongly affected by flow, temperature and gas mixture components concentration fields. Proper modifications of combustion process can provide more than 30% of the NO, emission abatement, approaching the corresponding emission limits, with simultaneous control of the flame geometry and position within the furnace. This kind of complex numerical experiments provides conditions for improvements of the power plant furnaces exploitation, with respect to high efficiency, operation flexibility and low emission.",
journal = "Thermal Science",
title = "Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control",
volume = "21",
pages = "S597-S615",
doi = "10.2298/TSCI160604186B"
}

Belošević, S., Tomanović, I. D., Crnomarković, N. Đ.,& Milićević, A.. (2017). Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control. in Thermal Science, 21, S597-S615.
https://doi.org/10.2298/TSCI160604186B

Belošević S, Tomanović ID, Crnomarković NĐ, Milićević A. Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control. in Thermal Science. 2017;21:S597-S615.
doi:10.2298/TSCI160604186B .

Belošević, Srđan, Tomanović, Ivan D., Crnomarković, Nenad Đ., Milićević, Aleksandar, "Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control" in Thermal Science, 21 (2017):S597-S615,
https://doi.org/10.2298/TSCI160604186B . .