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  - 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  - 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  - 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  - 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  - 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  - Tomanović, Ivan D.
AU  - Belošević, Srđan
AU  - Milićević, Aleksandar
AU  - Crnomarković, Nenad Đ.
AU  - Tucaković, Dragan R.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7189
AB  - Furnace sorbent injection for sulfur removal from flue gas presents a challenge, as the proper process optimization is of crucial importance in order to obtain both high sulfur removal rates and good sorbent utilization. In the simulations a two-phase gas-particle flow is considered. Pulverized coal and calcium-based sorbent particles motion is simulated inside of the boiler furnace. It is important to determine trajectories of particles in the furnace, in order to monitor the particles heat and concentration history. A two-way coupling of the phases is considered influence of the gas phase on the particles, and vice versa. Particle-to-particle collisions are neglected. Mutual influence of gas and dispersed phase is modeled by corresponding terms in the transport equations for gas phase and the equations describing the particles turbulent dispersion. Gas phase is modeled in Eulerian field, while the particles are tracked in Lagrangian field. Turbulence is modeled by the standard k-epsilon model, with additional terms for turbulence modulation. Distribution, dispersion and residence time of sorbent particles in the furnace have a considerable influence on the desulfurization process. It was shown that, by proper organization of process, significant improvement considering emission reduction can be achieved.
T2  - Thermal Science
T1  - Numerical Tracking of Sorbent Particles and Distribution During Gas Desulfurization in Pulverized Coal-Fired Furnace
VL  - 21
SP  - S759
EP  - S769
DO  - 10.2298/TSCI160212196T
ER  - 

@article{
author = "Tomanović, Ivan D. and Belošević, Srđan and Milićević, Aleksandar and Crnomarković, Nenad Đ. and Tucaković, Dragan R.",
year = "2017",
abstract = "Furnace sorbent injection for sulfur removal from flue gas presents a challenge, as the proper process optimization is of crucial importance in order to obtain both high sulfur removal rates and good sorbent utilization. In the simulations a two-phase gas-particle flow is considered. Pulverized coal and calcium-based sorbent particles motion is simulated inside of the boiler furnace. It is important to determine trajectories of particles in the furnace, in order to monitor the particles heat and concentration history. A two-way coupling of the phases is considered influence of the gas phase on the particles, and vice versa. Particle-to-particle collisions are neglected. Mutual influence of gas and dispersed phase is modeled by corresponding terms in the transport equations for gas phase and the equations describing the particles turbulent dispersion. Gas phase is modeled in Eulerian field, while the particles are tracked in Lagrangian field. Turbulence is modeled by the standard k-epsilon model, with additional terms for turbulence modulation. Distribution, dispersion and residence time of sorbent particles in the furnace have a considerable influence on the desulfurization process. It was shown that, by proper organization of process, significant improvement considering emission reduction can be achieved.",
journal = "Thermal Science",
title = "Numerical Tracking of Sorbent Particles and Distribution During Gas Desulfurization in Pulverized Coal-Fired Furnace",
volume = "21",
pages = "S759-S769",
doi = "10.2298/TSCI160212196T"
}

Tomanović, I. D., Belošević, S., Milićević, A., Crnomarković, N. Đ.,& Tucaković, D. R.. (2017). Numerical Tracking of Sorbent Particles and Distribution During Gas Desulfurization in Pulverized Coal-Fired Furnace. in Thermal Science, 21, S759-S769.
https://doi.org/10.2298/TSCI160212196T

Tomanović ID, Belošević S, Milićević A, Crnomarković NĐ, Tucaković DR. Numerical Tracking of Sorbent Particles and Distribution During Gas Desulfurization in Pulverized Coal-Fired Furnace. in Thermal Science. 2017;21:S759-S769.
doi:10.2298/TSCI160212196T .

Tomanović, Ivan D., Belošević, Srđan, Milićević, Aleksandar, Crnomarković, Nenad Đ., Tucaković, Dragan R., "Numerical Tracking of Sorbent Particles and Distribution During Gas Desulfurization in Pulverized Coal-Fired Furnace" in Thermal Science, 21 (2017):S759-S769,
https://doi.org/10.2298/TSCI160212196T . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Crnomarković, Nenad Đ.
AU  - Milićević, Aleksandar
AU  - Tucaković, Dragan R.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/949
AB  - Important tasks during pulverized coal-fired utility boiler exploitation are efficient utilization of variable quality fuels, operation in a wide range of loads and emission reduction of pollutants, like oxides of nitrogen and sulfur. Combustion process modifications for NOx control and the furnace sorbent injection for SO2 control are cost-effective clean coal technologies. For optimization of boiler operation mathematical prediction is regularly used and the need for modeling is most apparent in complex flows, such as turbulent reactive flows in coal-fired furnaces. Simulation of processes in a utility boiler pulverized lignite-fired furnace was performed by an in-house developed numerical code. The code is a promising numerical tool to be used also by engineering staff dealing with the process analysis in boiler units. A broad range of operating conditions was examined, such as different boiler loads, fuel and preheated air distribution over the burners and the burner tiers, grinding fineness of coal, cold air ingress and recirculation of flue gases from the boiler exit. Ash deposit on the screen walls, affecting the heat exchange inside the furnace, was considered as well. Simulations suggested optimal combustion modifications providing NOx emission reduction, with the flame geometry improvement, as well. SO2 reduction by injection of pulverized Ca-based sorbents into the furnace was also analyzed. Models of the sorbent particle calcination, sintering and sulfation reactions were optimized and implemented within the numerical code. Numerical experiments considered different operation parameters, such as Ca/S molar ratio, sorbent particle size and dispersion, local gas temperature in different injection zones and the particle residence time. A proper distribution of finely ground sorbent particles could be expected to provide an efficient absorption of SO2. With respect to the boiler thermal calculations, the facility should be controlled within narrow limits of operation parameters due to often contradictory requirements with respect to emission reduction and the boiler unit efficiency with safe operation of superheaters. A number of influencing parameters require such a complex approach to evaluate alternative solutions and enable efficient, low emission and flexible operation of power plant boiler units. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Applied Thermal Engineering
T1  - Numerical study of pulverized coal-fired utility boiler over a wide range of operating conditions for in-furnace SO2/NOx reduction
VL  - 94
SP  - 657
EP  - 669
DO  - 10.1016/j.applthermaleng.2015.10.162
ER  - 

@article{
author = "Belošević, Srđan and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Milićević, Aleksandar and Tucaković, Dragan R.",
year = "2016",
abstract = "Important tasks during pulverized coal-fired utility boiler exploitation are efficient utilization of variable quality fuels, operation in a wide range of loads and emission reduction of pollutants, like oxides of nitrogen and sulfur. Combustion process modifications for NOx control and the furnace sorbent injection for SO2 control are cost-effective clean coal technologies. For optimization of boiler operation mathematical prediction is regularly used and the need for modeling is most apparent in complex flows, such as turbulent reactive flows in coal-fired furnaces. Simulation of processes in a utility boiler pulverized lignite-fired furnace was performed by an in-house developed numerical code. The code is a promising numerical tool to be used also by engineering staff dealing with the process analysis in boiler units. A broad range of operating conditions was examined, such as different boiler loads, fuel and preheated air distribution over the burners and the burner tiers, grinding fineness of coal, cold air ingress and recirculation of flue gases from the boiler exit. Ash deposit on the screen walls, affecting the heat exchange inside the furnace, was considered as well. Simulations suggested optimal combustion modifications providing NOx emission reduction, with the flame geometry improvement, as well. SO2 reduction by injection of pulverized Ca-based sorbents into the furnace was also analyzed. Models of the sorbent particle calcination, sintering and sulfation reactions were optimized and implemented within the numerical code. Numerical experiments considered different operation parameters, such as Ca/S molar ratio, sorbent particle size and dispersion, local gas temperature in different injection zones and the particle residence time. A proper distribution of finely ground sorbent particles could be expected to provide an efficient absorption of SO2. With respect to the boiler thermal calculations, the facility should be controlled within narrow limits of operation parameters due to often contradictory requirements with respect to emission reduction and the boiler unit efficiency with safe operation of superheaters. A number of influencing parameters require such a complex approach to evaluate alternative solutions and enable efficient, low emission and flexible operation of power plant boiler units. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Applied Thermal Engineering",
title = "Numerical study of pulverized coal-fired utility boiler over a wide range of operating conditions for in-furnace SO2/NOx reduction",
volume = "94",
pages = "657-669",
doi = "10.1016/j.applthermaleng.2015.10.162"
}

Belošević, S., Tomanović, I. D., Crnomarković, N. Đ., Milićević, A.,& Tucaković, D. R.. (2016). Numerical study of pulverized coal-fired utility boiler over a wide range of operating conditions for in-furnace SO2/NOx reduction. in Applied Thermal Engineering, 94, 657-669.
https://doi.org/10.1016/j.applthermaleng.2015.10.162

Belošević S, Tomanović ID, Crnomarković NĐ, Milićević A, Tucaković DR. Numerical study of pulverized coal-fired utility boiler over a wide range of operating conditions for in-furnace SO2/NOx reduction. in Applied Thermal Engineering. 2016;94:657-669.
doi:10.1016/j.applthermaleng.2015.10.162 .

Belošević, Srđan, Tomanović, Ivan D., Crnomarković, Nenad Đ., Milićević, Aleksandar, Tucaković, Dragan R., "Numerical study of pulverized coal-fired utility boiler over a wide range of operating conditions for in-furnace SO2/NOx reduction" in Applied Thermal Engineering, 94 (2016):657-669,
https://doi.org/10.1016/j.applthermaleng.2015.10.162 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Crnomarković, Nenad Đ.
AU  - Milićević, Aleksandar
AU  - Tucaković, Dragan R.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1143
AB  - Pulverized coal-fired power plants should provide higher efficiency of energy conversion, flexibility in terms of boiler loads and fuel characteristics and emission reduction of pollutants like nitrogen oxides. Modification of combustion process is a cost-effective technology for NOx control. For optimization of complex processes, such as turbulent reactive flow in coal-fired furnaces, mathematical modeling is regularly used The NOx emission reduction by combustion modifications in the 350 MWe Kostolac B boiler furnace, tangentially fired by pulverized Serbian lignite, is investigated in the paper. Numerical experiments were done by an in-house developed 3-D differential comprehensive combustion code, with fuel- and thermal-NO formation/destruction reactions model. The code was developed to be easily used by engineering staff for process analysis in boiler units. A broad range of operating conditions was examined, such as fuel and preheated air distribution over the burners and tiers, operation mode of the burners, grinding fineness and quality of coal, boiler loads, cold air ingress, recirculation of flue gases, water-walls ash deposition and combined effect of different parameters. The predictions show that the NOx emission reduction of up to 30% can be achieved by a proper combustion organization in the case-study furnace, with the flame position control. Impact of combustion modifications on the boiler operation was evaluated by the boiler thermal calculations suggesting that the facility was to be controlled within narrow limits of operation parameters. Such a complex approach to pollutants control enables evaluating alternative solutions to achieve efficient and low emission operation of utility boiler units.
T2  - Thermal Science
T1  - Modeling and Optimization of Processes for Clean and Efficient Pulverized Coal Combustion in Utility Boilers
VL  - 20
SP  - S183
EP  - S196
DO  - 10.2298/TSCI150604223B
ER  - 

@article{
author = "Belošević, Srđan and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Milićević, Aleksandar and Tucaković, Dragan R.",
year = "2016",
abstract = "Pulverized coal-fired power plants should provide higher efficiency of energy conversion, flexibility in terms of boiler loads and fuel characteristics and emission reduction of pollutants like nitrogen oxides. Modification of combustion process is a cost-effective technology for NOx control. For optimization of complex processes, such as turbulent reactive flow in coal-fired furnaces, mathematical modeling is regularly used The NOx emission reduction by combustion modifications in the 350 MWe Kostolac B boiler furnace, tangentially fired by pulverized Serbian lignite, is investigated in the paper. Numerical experiments were done by an in-house developed 3-D differential comprehensive combustion code, with fuel- and thermal-NO formation/destruction reactions model. The code was developed to be easily used by engineering staff for process analysis in boiler units. A broad range of operating conditions was examined, such as fuel and preheated air distribution over the burners and tiers, operation mode of the burners, grinding fineness and quality of coal, boiler loads, cold air ingress, recirculation of flue gases, water-walls ash deposition and combined effect of different parameters. The predictions show that the NOx emission reduction of up to 30% can be achieved by a proper combustion organization in the case-study furnace, with the flame position control. Impact of combustion modifications on the boiler operation was evaluated by the boiler thermal calculations suggesting that the facility was to be controlled within narrow limits of operation parameters. Such a complex approach to pollutants control enables evaluating alternative solutions to achieve efficient and low emission operation of utility boiler units.",
journal = "Thermal Science",
title = "Modeling and Optimization of Processes for Clean and Efficient Pulverized Coal Combustion in Utility Boilers",
volume = "20",
pages = "S183-S196",
doi = "10.2298/TSCI150604223B"
}

Belošević, S., Tomanović, I. D., Crnomarković, N. Đ., Milićević, A.,& Tucaković, D. R.. (2016). Modeling and Optimization of Processes for Clean and Efficient Pulverized Coal Combustion in Utility Boilers. in Thermal Science, 20, S183-S196.
https://doi.org/10.2298/TSCI150604223B

Belošević S, Tomanović ID, Crnomarković NĐ, Milićević A, Tucaković DR. Modeling and Optimization of Processes for Clean and Efficient Pulverized Coal Combustion in Utility Boilers. in Thermal Science. 2016;20:S183-S196.
doi:10.2298/TSCI150604223B .

Belošević, Srđan, Tomanović, Ivan D., Crnomarković, Nenad Đ., Milićević, Aleksandar, Tucaković, Dragan R., "Modeling and Optimization of Processes for Clean and Efficient Pulverized Coal Combustion in Utility Boilers" in Thermal Science, 20 (2016):S183-S196,
https://doi.org/10.2298/TSCI150604223B . .

TY  - JOUR
AU  - Tomanović, Ivan D.
AU  - Belošević, Srđan
AU  - Milićević, Aleksandar
AU  - Tucaković, Dragan R.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/555
AB  - A mathematical model of calcium sorbent reactions for the simulation of sulfur dioxide reduction from pulverized coal combustion flue gasses was developed, implemented within a numerical code and validated against available measurements under controlled conditions. The model attempts to resemble closely the reactions of calcination, sintering and sulfation occurring during the motion of the sorbent particles in the furnace. The sulfation was based on the partially sintered spheres model (PSSM), coupled with simulated particle calcination and sintering. The complex geometry of the particle was taken into account, with the assumption that it consists of spherical grains in contact with each other. Numerical simulations of drop down tube reactors were performed for both CaCO3 and Ca(OH)(2) sorbent particles and results were compared with experimental data available from the literature. The model of the sorbent reactions will be further used for simulations of desulfurization reactions in turbulent gas-particle flow under coal combustion conditions.
T2  - Journal of the Serbian Chemical Society
T1  - Modeling of the reactions of a calcium-based sorbent with sulfur dioxide
VL  - 80
IS  - 4
SP  - 549
EP  - 562
DO  - 10.2298/JSC140903115T
ER  - 

@article{
author = "Tomanović, Ivan D. and Belošević, Srđan and Milićević, Aleksandar and Tucaković, Dragan R.",
year = "2015",
abstract = "A mathematical model of calcium sorbent reactions for the simulation of sulfur dioxide reduction from pulverized coal combustion flue gasses was developed, implemented within a numerical code and validated against available measurements under controlled conditions. The model attempts to resemble closely the reactions of calcination, sintering and sulfation occurring during the motion of the sorbent particles in the furnace. The sulfation was based on the partially sintered spheres model (PSSM), coupled with simulated particle calcination and sintering. The complex geometry of the particle was taken into account, with the assumption that it consists of spherical grains in contact with each other. Numerical simulations of drop down tube reactors were performed for both CaCO3 and Ca(OH)(2) sorbent particles and results were compared with experimental data available from the literature. The model of the sorbent reactions will be further used for simulations of desulfurization reactions in turbulent gas-particle flow under coal combustion conditions.",
journal = "Journal of the Serbian Chemical Society",
title = "Modeling of the reactions of a calcium-based sorbent with sulfur dioxide",
volume = "80",
number = "4",
pages = "549-562",
doi = "10.2298/JSC140903115T"
}

Tomanović, I. D., Belošević, S., Milićević, A.,& Tucaković, D. R.. (2015). Modeling of the reactions of a calcium-based sorbent with sulfur dioxide. in Journal of the Serbian Chemical Society, 80(4), 549-562.
https://doi.org/10.2298/JSC140903115T

Tomanović ID, Belošević S, Milićević A, Tucaković DR. Modeling of the reactions of a calcium-based sorbent with sulfur dioxide. in Journal of the Serbian Chemical Society. 2015;80(4):549-562.
doi:10.2298/JSC140903115T .

Tomanović, Ivan D., Belošević, Srđan, Milićević, Aleksandar, Tucaković, Dragan R., "Modeling of the reactions of a calcium-based sorbent with sulfur dioxide" in Journal of the Serbian Chemical Society, 80, no. 4 (2015):549-562,
https://doi.org/10.2298/JSC140903115T . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Tomanović, Ivan D.
AU  - Beljanski, Vladimir
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7045
AB  - Coal-fired power plant technologies should provide higher efficiency of energy conversion, reduction of pollutants emission, operation of facilities in a wide range of loads and efficient utilization of variable quality fuels. In order to achieve these tasks, mathematical modeling is regularly used worldwide for optimization of boiler operation. Reduction of pollutants emission is the task of greatest concerns. Among the most important pollutants are oxides of nitrogen and sulfur. Combustion process modifications for NOx control and sorbent injection for SO2 control are cost-effective clean coal technologies, used either standalone or with other methods. An in-house developed computer code was applied for simulation of processes in the 350 MWe boiler furnace, tangentially fired by pulverized lignite. Predictions suggested optimal combustion organization providing the NOx emission reduction of up to 20 -30%, with the flame position improvement. Boiler thermal calculations showed that the facility was to be controlled within narrow limits of working parameters. SO2 reduction by injection of Ca-based sorbent particles into the furnace was simulated for different operation parameters. Such a complex approach enables effective evaluation of alternative solutions, considering emissions, flame position and efficiency of furnace processes and the boiler unit. (C) 2013 Elsevier Ltd. All rights reserved.
T2  - Applied Thermal Engineering
T1  - Numerical prediction of processes for clean and efficient combustion of pulverized coal in power plants
VL  - 74
SP  - 102
EP  - 110
DO  - 10.1016/j.applthermaleng.2013.11.019
ER  - 

@article{
author = "Belošević, Srđan and Tomanović, Ivan D. and Beljanski, Vladimir and Tucaković, Dragan R. and Živanović, Titoslav",
year = "2015",
abstract = "Coal-fired power plant technologies should provide higher efficiency of energy conversion, reduction of pollutants emission, operation of facilities in a wide range of loads and efficient utilization of variable quality fuels. In order to achieve these tasks, mathematical modeling is regularly used worldwide for optimization of boiler operation. Reduction of pollutants emission is the task of greatest concerns. Among the most important pollutants are oxides of nitrogen and sulfur. Combustion process modifications for NOx control and sorbent injection for SO2 control are cost-effective clean coal technologies, used either standalone or with other methods. An in-house developed computer code was applied for simulation of processes in the 350 MWe boiler furnace, tangentially fired by pulverized lignite. Predictions suggested optimal combustion organization providing the NOx emission reduction of up to 20 -30%, with the flame position improvement. Boiler thermal calculations showed that the facility was to be controlled within narrow limits of working parameters. SO2 reduction by injection of Ca-based sorbent particles into the furnace was simulated for different operation parameters. Such a complex approach enables effective evaluation of alternative solutions, considering emissions, flame position and efficiency of furnace processes and the boiler unit. (C) 2013 Elsevier Ltd. All rights reserved.",
journal = "Applied Thermal Engineering",
title = "Numerical prediction of processes for clean and efficient combustion of pulverized coal in power plants",
volume = "74",
pages = "102-110",
doi = "10.1016/j.applthermaleng.2013.11.019"
}

Belošević, S., Tomanović, I. D., Beljanski, V., Tucaković, D. R.,& Živanović, T.. (2015). Numerical prediction of processes for clean and efficient combustion of pulverized coal in power plants. in Applied Thermal Engineering, 74, 102-110.
https://doi.org/10.1016/j.applthermaleng.2013.11.019

Belošević S, Tomanović ID, Beljanski V, Tucaković DR, Živanović T. Numerical prediction of processes for clean and efficient combustion of pulverized coal in power plants. in Applied Thermal Engineering. 2015;74:102-110.
doi:10.1016/j.applthermaleng.2013.11.019 .

Belošević, Srđan, Tomanović, Ivan D., Beljanski, Vladimir, Tucaković, Dragan R., Živanović, Titoslav, "Numerical prediction of processes for clean and efficient combustion of pulverized coal in power plants" in Applied Thermal Engineering, 74 (2015):102-110,
https://doi.org/10.1016/j.applthermaleng.2013.11.019 . .

TY  - JOUR
AU  - Stupar, Goran
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
AU  - Belošević, Srđan
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/415
AB  - The European normatives prescribe content of 200 mg/Nm(3) NO for pulverized coal combusting power plants. In order to reduce content of NOx in Serbian thermal power plant (TPP) square Kostolac B square its necessary to implement particular measures until 2016. The mathematical model of lignite combustion in the steam boiler furnace is defined and applied to analyze the possibility of implementing certain primary measures for reducing nitrogen oxides and their effects on the steam boiler operation. This model includes processes in the coal-fired furnace and defines radiating reactive two-phase turbulent flow. The model of turbulent flow also contains sub-model of fuel and thermal NOx formation and destruction. This complex mathematical model is related to thermal and aerodynamic calculations of the steam boiler within a unified calculation system in order to analyze the steam boiler overall work. This system provides calculations with a number of influential parameters. The steam boiler calculations for unit 1 (350 MWe) of TPP square Kostolac B square are implemented for existing and modified combustion system in order to achieve effective, reliable and ecological facility work. The paper presents the influence analysis of large number of parameters on the steam boiler operation with an accepted concept of primary measures. Presented system of calculations is verified against measurements in TPP square Kostolac B square. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Applied Thermal Engineering
T1  - Assessing the impact of primary measures for NOx reduction on the thermal power plant steam boiler
VL  - 78
SP  - 397
EP  - 409
DO  - 10.1016/j.applthermaleng.2014.12.074
ER  - 

@article{
author = "Stupar, Goran and Tucaković, Dragan R. and Živanović, Titoslav and Belošević, Srđan",
year = "2015",
abstract = "The European normatives prescribe content of 200 mg/Nm(3) NO for pulverized coal combusting power plants. In order to reduce content of NOx in Serbian thermal power plant (TPP) square Kostolac B square its necessary to implement particular measures until 2016. The mathematical model of lignite combustion in the steam boiler furnace is defined and applied to analyze the possibility of implementing certain primary measures for reducing nitrogen oxides and their effects on the steam boiler operation. This model includes processes in the coal-fired furnace and defines radiating reactive two-phase turbulent flow. The model of turbulent flow also contains sub-model of fuel and thermal NOx formation and destruction. This complex mathematical model is related to thermal and aerodynamic calculations of the steam boiler within a unified calculation system in order to analyze the steam boiler overall work. This system provides calculations with a number of influential parameters. The steam boiler calculations for unit 1 (350 MWe) of TPP square Kostolac B square are implemented for existing and modified combustion system in order to achieve effective, reliable and ecological facility work. The paper presents the influence analysis of large number of parameters on the steam boiler operation with an accepted concept of primary measures. Presented system of calculations is verified against measurements in TPP square Kostolac B square. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Applied Thermal Engineering",
title = "Assessing the impact of primary measures for NOx reduction on the thermal power plant steam boiler",
volume = "78",
pages = "397-409",
doi = "10.1016/j.applthermaleng.2014.12.074"
}

Stupar, G., Tucaković, D. R., Živanović, T.,& Belošević, S.. (2015). Assessing the impact of primary measures for NOx reduction on the thermal power plant steam boiler. in Applied Thermal Engineering, 78, 397-409.
https://doi.org/10.1016/j.applthermaleng.2014.12.074

Stupar G, Tucaković DR, Živanović T, Belošević S. Assessing the impact of primary measures for NOx reduction on the thermal power plant steam boiler. in Applied Thermal Engineering. 2015;78:397-409.
doi:10.1016/j.applthermaleng.2014.12.074 .

Stupar, Goran, Tucaković, Dragan R., Živanović, Titoslav, Belošević, Srđan, "Assessing the impact of primary measures for NOx reduction on the thermal power plant steam boiler" in Applied Thermal Engineering, 78 (2015):397-409,
https://doi.org/10.1016/j.applthermaleng.2014.12.074 . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Sijercic, Miroslav
AU  - Belošević, Srđan
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/118
AB  - The objective of the research was to find if an agreement of the results of a numerical investigation with experimental data could be achieved considering the two-phase medium in thermal equilibrium. Influence of the gray radiative properties on the radiative heat exchange inside pulverized lignite fired furnaces was investigated using the computational fluid dynamics (CFD) code based on a comprehensive mathematical model of the process. Radiative heat exchange was calculated using Hottels zonal model. Heat transfer rates and wall fluxes increased for small values of the total extinction coefficient, K-t LT 0.2 m(-1); decreased for large values of K-t, K-t GT 2.0 m(-1); and were maximal for moderate values of K-t, 0.2 LT K-t LT 2.0 m(-1). Heat transfer rates and wall fluxes decreased with the increase of the scattering albedo, though the decrease was considerable only for omega GT 0.5. Agreement with the experimental data was obtained for the moderate values of the K-t and for scattering albedo 0.1 LT omega LT 0.5. (C) 2014 Elsevier Masson SAS. All rights reserved.
T2  - International Journal of Thermal Sciences
T1  - Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases
VL  - 85
SP  - 21
EP  - 28
DO  - 10.1016/j.ijthermalsci.2014.06.014
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Sijercic, Miroslav and Belošević, Srđan and Tucaković, Dragan R. and Živanović, Titoslav",
year = "2014",
abstract = "The objective of the research was to find if an agreement of the results of a numerical investigation with experimental data could be achieved considering the two-phase medium in thermal equilibrium. Influence of the gray radiative properties on the radiative heat exchange inside pulverized lignite fired furnaces was investigated using the computational fluid dynamics (CFD) code based on a comprehensive mathematical model of the process. Radiative heat exchange was calculated using Hottels zonal model. Heat transfer rates and wall fluxes increased for small values of the total extinction coefficient, K-t LT 0.2 m(-1); decreased for large values of K-t, K-t GT 2.0 m(-1); and were maximal for moderate values of K-t, 0.2 LT K-t LT 2.0 m(-1). Heat transfer rates and wall fluxes decreased with the increase of the scattering albedo, though the decrease was considerable only for omega GT 0.5. Agreement with the experimental data was obtained for the moderate values of the K-t and for scattering albedo 0.1 LT omega LT 0.5. (C) 2014 Elsevier Masson SAS. All rights reserved.",
journal = "International Journal of Thermal Sciences",
title = "Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases",
volume = "85",
pages = "21-28",
doi = "10.1016/j.ijthermalsci.2014.06.014"
}

Crnomarković, N. Đ., Sijercic, M., Belošević, S., Tucaković, D. R.,& Živanović, T.. (2014). Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases. in International Journal of Thermal Sciences, 85, 21-28.
https://doi.org/10.1016/j.ijthermalsci.2014.06.014

Crnomarković NĐ, Sijercic M, Belošević S, Tucaković DR, Živanović T. Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases. in International Journal of Thermal Sciences. 2014;85:21-28.
doi:10.1016/j.ijthermalsci.2014.06.014 .

Crnomarković, Nenad Đ., Sijercic, Miroslav, Belošević, Srđan, Tucaković, Dragan R., Živanović, Titoslav, "Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases" in International Journal of Thermal Sciences, 85 (2014):21-28,
https://doi.org/10.1016/j.ijthermalsci.2014.06.014 . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Sijercic, Miroslav
AU  - Belošević, Srđan
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4364
AB  - Comparison of the numerical investigation results was carried out when the simple gray gas (SGG) and weighted sum of gray gases (WSGG) models are used to model the radiative properties of the gas phase inside the lignite fired furnaces. Comprehensive mathematical model of the tangentially fired furnace by pulverized lignite was made. Gas radiative properties were modeled by the SGG and WSGG models. Radiative heat transfer was modeled by the zonal model. Gas-phase variables and absorbed wall fluxes were compared on the basis of the relative differences that were determined for all control volumes and surface zones. Average relative differences of the gas-phase temperatures were about 1.0%. Average relative differences of the absorbed wall fluxes were from 2.0% to 5.0%. Absorbed wall fluxes determined by the SGG model were bigger than those determined by the WSGG model. Differences of the heat transfer rates of the absorbed radiation through the furnace walls were expressed in percents of heat transfer rates determined by the SGG model and were similar to the average relative differences of absorbed wall fluxes. Results justify application of the SGG model in comprehensive mathematical models of lignite-fired furnaces. (C) 2012 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Numerical investigation of processes in the lignite-fired furnace when simple gray gas and weighted sum of gray gases models are used
VL  - 56
IS  - 1-2
SP  - 197
EP  - 205
DO  - 10.1016/j.ijheatmasstransfer.2012.09.024
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Sijercic, Miroslav and Belošević, Srđan and Tucaković, Dragan R. and Živanović, Titoslav",
year = "2013",
abstract = "Comparison of the numerical investigation results was carried out when the simple gray gas (SGG) and weighted sum of gray gases (WSGG) models are used to model the radiative properties of the gas phase inside the lignite fired furnaces. Comprehensive mathematical model of the tangentially fired furnace by pulverized lignite was made. Gas radiative properties were modeled by the SGG and WSGG models. Radiative heat transfer was modeled by the zonal model. Gas-phase variables and absorbed wall fluxes were compared on the basis of the relative differences that were determined for all control volumes and surface zones. Average relative differences of the gas-phase temperatures were about 1.0%. Average relative differences of the absorbed wall fluxes were from 2.0% to 5.0%. Absorbed wall fluxes determined by the SGG model were bigger than those determined by the WSGG model. Differences of the heat transfer rates of the absorbed radiation through the furnace walls were expressed in percents of heat transfer rates determined by the SGG model and were similar to the average relative differences of absorbed wall fluxes. Results justify application of the SGG model in comprehensive mathematical models of lignite-fired furnaces. (C) 2012 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Numerical investigation of processes in the lignite-fired furnace when simple gray gas and weighted sum of gray gases models are used",
volume = "56",
number = "1-2",
pages = "197-205",
doi = "10.1016/j.ijheatmasstransfer.2012.09.024"
}

Crnomarković, N. Đ., Sijercic, M., Belošević, S., Tucaković, D. R.,& Živanović, T.. (2013). Numerical investigation of processes in the lignite-fired furnace when simple gray gas and weighted sum of gray gases models are used. in International Journal of Heat and Mass Transfer, 56(1-2), 197-205.
https://doi.org/10.1016/j.ijheatmasstransfer.2012.09.024

Crnomarković NĐ, Sijercic M, Belošević S, Tucaković DR, Živanović T. Numerical investigation of processes in the lignite-fired furnace when simple gray gas and weighted sum of gray gases models are used. in International Journal of Heat and Mass Transfer. 2013;56(1-2):197-205.
doi:10.1016/j.ijheatmasstransfer.2012.09.024 .

Crnomarković, Nenad Đ., Sijercic, Miroslav, Belošević, Srđan, Tucaković, Dragan R., Živanović, Titoslav, "Numerical investigation of processes in the lignite-fired furnace when simple gray gas and weighted sum of gray gases models are used" in International Journal of Heat and Mass Transfer, 56, no. 1-2 (2013):197-205,
https://doi.org/10.1016/j.ijheatmasstransfer.2012.09.024 . .

TY  - JOUR
AU  - Tucaković, Dragan R.
AU  - Stupar, Goran
AU  - Živanović, Titoslav
AU  - Petrović, Milan
AU  - Belošević, Srđan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5541
AB  - Within the energy system in Methanol vinegar complex (MVC) in Kikinda, beside process boiler and auxiliary equipment, there are three equal steam boilers made by Minel Kotlogradnja, provided for combustion of natural gas, fuel oil and process gases. Aiming to increase the MVC Kikinda energy plant capacity, one gas turbine of 14 MW or 17 MW is going to be installed. In regard to relatively high gas temperature and a large amount of the unused oxygen from the air in the exhaust gas, it is specified to split exhaust gas into the two equal streams and import them into the two existing steam boilers, each having production of 16.67 kg/s (60 t/h). In order to use the exhaust gas heat, as well as oxygen contained within, it is necessary to replace the existing burners and to reconstruct the heat exchangers in the steam boiler vertical convective pass. Besides, it is necessary to verify if the existing flue gases fan can comply with the new operating regime, during which a half of the turbine exhaust gas is imported into the steam boiler. (c) 2013 Elsevier Ltd. All rights reserved.
T2  - Applied Thermal Engineering
T1  - Possibilities for reconstruction of existing steam boilers for the purpose of using exhaust gases from 14 MW or 17 MW gas turbine
VL  - 56
IS  - 1-2
SP  - 83
EP  - 90
DO  - 10.1016/j.applthermaleng.2013.03.028
ER  - 

@article{
author = "Tucaković, Dragan R. and Stupar, Goran and Živanović, Titoslav and Petrović, Milan and Belošević, Srđan",
year = "2013",
abstract = "Within the energy system in Methanol vinegar complex (MVC) in Kikinda, beside process boiler and auxiliary equipment, there are three equal steam boilers made by Minel Kotlogradnja, provided for combustion of natural gas, fuel oil and process gases. Aiming to increase the MVC Kikinda energy plant capacity, one gas turbine of 14 MW or 17 MW is going to be installed. In regard to relatively high gas temperature and a large amount of the unused oxygen from the air in the exhaust gas, it is specified to split exhaust gas into the two equal streams and import them into the two existing steam boilers, each having production of 16.67 kg/s (60 t/h). In order to use the exhaust gas heat, as well as oxygen contained within, it is necessary to replace the existing burners and to reconstruct the heat exchangers in the steam boiler vertical convective pass. Besides, it is necessary to verify if the existing flue gases fan can comply with the new operating regime, during which a half of the turbine exhaust gas is imported into the steam boiler. (c) 2013 Elsevier Ltd. All rights reserved.",
journal = "Applied Thermal Engineering",
title = "Possibilities for reconstruction of existing steam boilers for the purpose of using exhaust gases from 14 MW or 17 MW gas turbine",
volume = "56",
number = "1-2",
pages = "83-90",
doi = "10.1016/j.applthermaleng.2013.03.028"
}

Tucaković, D. R., Stupar, G., Živanović, T., Petrović, M.,& Belošević, S.. (2013). Possibilities for reconstruction of existing steam boilers for the purpose of using exhaust gases from 14 MW or 17 MW gas turbine. in Applied Thermal Engineering, 56(1-2), 83-90.
https://doi.org/10.1016/j.applthermaleng.2013.03.028

Tucaković DR, Stupar G, Živanović T, Petrović M, Belošević S. Possibilities for reconstruction of existing steam boilers for the purpose of using exhaust gases from 14 MW or 17 MW gas turbine. in Applied Thermal Engineering. 2013;56(1-2):83-90.
doi:10.1016/j.applthermaleng.2013.03.028 .

Tucaković, Dragan R., Stupar, Goran, Živanović, Titoslav, Petrović, Milan, Belošević, Srđan, "Possibilities for reconstruction of existing steam boilers for the purpose of using exhaust gases from 14 MW or 17 MW gas turbine" in Applied Thermal Engineering, 56, no. 1-2 (2013):83-90,
https://doi.org/10.1016/j.applthermaleng.2013.03.028 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Beljanski, Vladimir
AU  - Tomanović, Ivan D.
AU  - Crnomarković, Nenad Đ.
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6938
AB  - Considerable research efforts focus on modeling NOx formation/destruction and predicting NOx emission so that it can be controlled. A motivation for this numerical study was to examine the efficiency of combustion modifications in the furnaces of Kostolac B 350 MWe boiler units, tangentially fired by pulverized lignite. Numerical analysis was done by an in-house developed NOx submodel, coupled with differential comprehensive combustion model, previously developed and validated. The NOx submodel focuses on homogeneous reactions of both the fuel and the thermal NO formation/destruction processes. The submodel was validated by comparison of predicted NOx emissions with available measurements at the boiler units. Selected predictions of the emission, the furnace exit gas temperature, NO concentration, gas temperature, and velocity field are given for the case-study furnace under different operating conditions. The individual or combined effects of coal and preheated air distribution over the individual burners and the burner tiers, the grinding fineness and quality of coal, and the cold air ingress were investigated. Reduced emissions of up to 20-30% can be achieved only by proper organization of the combustion process. Obtained results were verified by the boiler thermal calculations. An optimal range of the furnace exit gas temperatures was proposed, with respect to the safe operation of the steam superheater. Simulations by means of a computer code developed for the purpose, showed that the air staging using overfire air ports might provide the NOx emission reduction of up to 24% in the test-cases with relatively high emission and up to 7% of additional reduction in already optimized cases.
T2  - Energy and Fuels
T1  - Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler
VL  - 26
IS  - 1
SP  - 425
EP  - 442
DO  - 10.1021/ef201380z
ER  - 

@article{
author = "Belošević, Srđan and Beljanski, Vladimir and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Tucaković, Dragan R. and Živanović, Titoslav",
year = "2012",
abstract = "Considerable research efforts focus on modeling NOx formation/destruction and predicting NOx emission so that it can be controlled. A motivation for this numerical study was to examine the efficiency of combustion modifications in the furnaces of Kostolac B 350 MWe boiler units, tangentially fired by pulverized lignite. Numerical analysis was done by an in-house developed NOx submodel, coupled with differential comprehensive combustion model, previously developed and validated. The NOx submodel focuses on homogeneous reactions of both the fuel and the thermal NO formation/destruction processes. The submodel was validated by comparison of predicted NOx emissions with available measurements at the boiler units. Selected predictions of the emission, the furnace exit gas temperature, NO concentration, gas temperature, and velocity field are given for the case-study furnace under different operating conditions. The individual or combined effects of coal and preheated air distribution over the individual burners and the burner tiers, the grinding fineness and quality of coal, and the cold air ingress were investigated. Reduced emissions of up to 20-30% can be achieved only by proper organization of the combustion process. Obtained results were verified by the boiler thermal calculations. An optimal range of the furnace exit gas temperatures was proposed, with respect to the safe operation of the steam superheater. Simulations by means of a computer code developed for the purpose, showed that the air staging using overfire air ports might provide the NOx emission reduction of up to 24% in the test-cases with relatively high emission and up to 7% of additional reduction in already optimized cases.",
journal = "Energy and Fuels",
title = "Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler",
volume = "26",
number = "1",
pages = "425-442",
doi = "10.1021/ef201380z"
}

Belošević, S., Beljanski, V., Tomanović, I. D., Crnomarković, N. Đ., Tucaković, D. R.,& Živanović, T.. (2012). Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler. in Energy and Fuels, 26(1), 425-442.
https://doi.org/10.1021/ef201380z

Belošević S, Beljanski V, Tomanović ID, Crnomarković NĐ, Tucaković DR, Živanović T. Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler. in Energy and Fuels. 2012;26(1):425-442.
doi:10.1021/ef201380z .

Belošević, Srđan, Beljanski, Vladimir, Tomanović, Ivan D., Crnomarković, Nenad Đ., Tucaković, Dragan R., Živanović, Titoslav, "Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler" in Energy and Fuels, 26, no. 1 (2012):425-442,
https://doi.org/10.1021/ef201380z . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Sijercic, Miroslav A.
AU  - Belošević, Srđan
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4821
AB  - Difference of results of numerical simulation of pulverized coal fired furnace when mathematical models contain various radiation models has been described in the paper. Two sets of numerical simulations of pulverized coal fired furnace of 210 MWe power boiler have been performed. One numerical simulation has contained Hottels zonal model, whereas the other numerical simulation has contained six-flux model. Other details of numerical simulations have been identical. The influence of radiation models has been examined through comparison of selected variables (gas-phase temperature, oxygen concentration, and absorbed radiative heat rate of surface zones of rear and right furnace walls), selected global parameters of furnace operation (total absorbed heat rate by all furnace walls and furnace exit gas-phase temperature). Computation time has been compared as well. Spatially distributed variables have been compared through maximal local differences and mean differences. Maximal local difference of gas-phase temperature has been 8.44%. Maximal local difference of absorbed radiative heat rate of the surface zones has been almost 80.0%. Difference of global parameters of furnace operation has been expressed in percents of value obtained by mathematical model containing Hottels zonal model and has not been bigger than 7.0%. Computation time for calculation of 1000 iterations has been approximately the same. Comparison with other radiation models is necessary for assessment of differences.
T2  - Thermal Science
T1  - Influence of Application of Hottels Zonal Model and Six-Flux Model of Thermal Radiation on Numerical Simulations Results of Pulverized Coal Fired Furnace
VL  - 16
IS  - 1
SP  - 271
EP  - 282
DO  - 10.2298/TSCI110627126C
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Sijercic, Miroslav A. and Belošević, Srđan and Tucaković, Dragan R. and Živanović, Titoslav V.",
year = "2012",
abstract = "Difference of results of numerical simulation of pulverized coal fired furnace when mathematical models contain various radiation models has been described in the paper. Two sets of numerical simulations of pulverized coal fired furnace of 210 MWe power boiler have been performed. One numerical simulation has contained Hottels zonal model, whereas the other numerical simulation has contained six-flux model. Other details of numerical simulations have been identical. The influence of radiation models has been examined through comparison of selected variables (gas-phase temperature, oxygen concentration, and absorbed radiative heat rate of surface zones of rear and right furnace walls), selected global parameters of furnace operation (total absorbed heat rate by all furnace walls and furnace exit gas-phase temperature). Computation time has been compared as well. Spatially distributed variables have been compared through maximal local differences and mean differences. Maximal local difference of gas-phase temperature has been 8.44%. Maximal local difference of absorbed radiative heat rate of the surface zones has been almost 80.0%. Difference of global parameters of furnace operation has been expressed in percents of value obtained by mathematical model containing Hottels zonal model and has not been bigger than 7.0%. Computation time for calculation of 1000 iterations has been approximately the same. Comparison with other radiation models is necessary for assessment of differences.",
journal = "Thermal Science",
title = "Influence of Application of Hottels Zonal Model and Six-Flux Model of Thermal Radiation on Numerical Simulations Results of Pulverized Coal Fired Furnace",
volume = "16",
number = "1",
pages = "271-282",
doi = "10.2298/TSCI110627126C"
}

Crnomarković, N. Đ., Sijercic, M. A., Belošević, S., Tucaković, D. R.,& Živanović, T. V.. (2012). Influence of Application of Hottels Zonal Model and Six-Flux Model of Thermal Radiation on Numerical Simulations Results of Pulverized Coal Fired Furnace. in Thermal Science, 16(1), 271-282.
https://doi.org/10.2298/TSCI110627126C

Crnomarković NĐ, Sijercic MA, Belošević S, Tucaković DR, Živanović TV. Influence of Application of Hottels Zonal Model and Six-Flux Model of Thermal Radiation on Numerical Simulations Results of Pulverized Coal Fired Furnace. in Thermal Science. 2012;16(1):271-282.
doi:10.2298/TSCI110627126C .

Crnomarković, Nenad Đ., Sijercic, Miroslav A., Belošević, Srđan, Tucaković, Dragan R., Živanović, Titoslav V., "Influence of Application of Hottels Zonal Model and Six-Flux Model of Thermal Radiation on Numerical Simulations Results of Pulverized Coal Fired Furnace" in Thermal Science, 16, no. 1 (2012):271-282,
https://doi.org/10.2298/TSCI110627126C . .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Sijercic, Miroslav
AU  - Belošević, Srđan
AU  - Stanković, Branislav D.
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5053
AB  - A possibility of simplification of the scattering phase function of a pulverized coal flame was analyzed in the paper. It was showed that the type of radiation scattering of a pulverized coal flame is between two limiting cases: isotropic and forward scattering. A comprehensive mathematical model of a tangentially fired furnace by pulverized coal was formed. Radiative heat transfer was modeled using the six-flux model. Grid independent results of the numerical simulations were obtained. The mathematical model was verified by comparison of the results of numerical simulations with results of measurements. The influence of the type of radiation scattering on results of numerical simulation was analyzed through the relative and average differences of the gas-phase temperatures, the total radiation fluxes, and the absorbed wall fluxes of the left furnace wall. The investigation showed that the total radiation fluxes were considerably influenced by the type of radiation scattering. On the other hand, the gas-phase temperatures and the absorbed wall fluxes were much less influenced by the type of radiation scattering. The results justify the use of the scattering phase function corresponding to isotropic scattering in radiation models of comprehensive mathematical models of pulverized coal fired furnaces. (C) 2012 Elsevier Ltd. All rights reserved.
T2  - Energy
T1  - Influence of forward scattering on prediction of temperature and radiation fields inside the pulverized coal furnace
VL  - 45
IS  - 1
SP  - 160
EP  - 168
DO  - 10.1016/j.energy.2012.01.019
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Sijercic, Miroslav and Belošević, Srđan and Stanković, Branislav D. and Tucaković, Dragan R. and Živanović, Titoslav",
year = "2012",
abstract = "A possibility of simplification of the scattering phase function of a pulverized coal flame was analyzed in the paper. It was showed that the type of radiation scattering of a pulverized coal flame is between two limiting cases: isotropic and forward scattering. A comprehensive mathematical model of a tangentially fired furnace by pulverized coal was formed. Radiative heat transfer was modeled using the six-flux model. Grid independent results of the numerical simulations were obtained. The mathematical model was verified by comparison of the results of numerical simulations with results of measurements. The influence of the type of radiation scattering on results of numerical simulation was analyzed through the relative and average differences of the gas-phase temperatures, the total radiation fluxes, and the absorbed wall fluxes of the left furnace wall. The investigation showed that the total radiation fluxes were considerably influenced by the type of radiation scattering. On the other hand, the gas-phase temperatures and the absorbed wall fluxes were much less influenced by the type of radiation scattering. The results justify the use of the scattering phase function corresponding to isotropic scattering in radiation models of comprehensive mathematical models of pulverized coal fired furnaces. (C) 2012 Elsevier Ltd. All rights reserved.",
journal = "Energy",
title = "Influence of forward scattering on prediction of temperature and radiation fields inside the pulverized coal furnace",
volume = "45",
number = "1",
pages = "160-168",
doi = "10.1016/j.energy.2012.01.019"
}

Crnomarković, N. Đ., Sijercic, M., Belošević, S., Stanković, B. D., Tucaković, D. R.,& Živanović, T.. (2012). Influence of forward scattering on prediction of temperature and radiation fields inside the pulverized coal furnace. in Energy, 45(1), 160-168.
https://doi.org/10.1016/j.energy.2012.01.019

Crnomarković NĐ, Sijercic M, Belošević S, Stanković BD, Tucaković DR, Živanović T. Influence of forward scattering on prediction of temperature and radiation fields inside the pulverized coal furnace. in Energy. 2012;45(1):160-168.
doi:10.1016/j.energy.2012.01.019 .

Crnomarković, Nenad Đ., Sijercic, Miroslav, Belošević, Srđan, Stanković, Branislav D., Tucaković, Dragan R., Živanović, Titoslav, "Influence of forward scattering on prediction of temperature and radiation fields inside the pulverized coal furnace" in Energy, 45, no. 1 (2012):160-168,
https://doi.org/10.1016/j.energy.2012.01.019 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Sijercic, Miroslav
AU  - Crnomarković, Nenad Đ.
AU  - Stanković, Branislav D.
AU  - Tucaković, Dragan R.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3849
AB  - In optimization of a utility boiler furnace operation, special attention is given to the flame geometry and position. As an illustration of possibilities for application of mathematical prediction and numerical experiment in efficient optimization of the flame, the paper presents selected results of simulations of processes in pulverized coal tangentially Fired furnace of Kostolac-B 350 MW electric boiler unit, To analyze the furnace working under different conditions, a differential 3D mathematical model of two-phase turbulent reactive flow with heat and mass transfer and corresponding computer code have been developed. Using the model and the code, previously carefully verified and validated against field measurements, an extensive numerical study has been performed to investigate the dependence of the furnace flame characteristics oil different operating conditions, including distribution of the coal, air flow rates, and particle size classes over the burner tiers, as well as the quality and grinding fineness of coal and the operation scheme of the coal mills. The numerical predictions of the flame characteristics enable a specific tool for optimization of the boiler unit with respect to efficiency and ecology.
T2  - Energy and Fuels
T1  - Numerical Prediction of Pulverized Coal Flame in Utility Boiler Furnaces
VL  - 23
IS  - 11
SP  - 5401
EP  - 5412
DO  - 10.1021/ef9005737
ER  - 

@article{
author = "Belošević, Srđan and Sijercic, Miroslav and Crnomarković, Nenad Đ. and Stanković, Branislav D. and Tucaković, Dragan R.",
year = "2009",
abstract = "In optimization of a utility boiler furnace operation, special attention is given to the flame geometry and position. As an illustration of possibilities for application of mathematical prediction and numerical experiment in efficient optimization of the flame, the paper presents selected results of simulations of processes in pulverized coal tangentially Fired furnace of Kostolac-B 350 MW electric boiler unit, To analyze the furnace working under different conditions, a differential 3D mathematical model of two-phase turbulent reactive flow with heat and mass transfer and corresponding computer code have been developed. Using the model and the code, previously carefully verified and validated against field measurements, an extensive numerical study has been performed to investigate the dependence of the furnace flame characteristics oil different operating conditions, including distribution of the coal, air flow rates, and particle size classes over the burner tiers, as well as the quality and grinding fineness of coal and the operation scheme of the coal mills. The numerical predictions of the flame characteristics enable a specific tool for optimization of the boiler unit with respect to efficiency and ecology.",
journal = "Energy and Fuels",
title = "Numerical Prediction of Pulverized Coal Flame in Utility Boiler Furnaces",
volume = "23",
number = "11",
pages = "5401-5412",
doi = "10.1021/ef9005737"
}

Belošević, S., Sijercic, M., Crnomarković, N. Đ., Stanković, B. D.,& Tucaković, D. R.. (2009). Numerical Prediction of Pulverized Coal Flame in Utility Boiler Furnaces. in Energy and Fuels, 23(11), 5401-5412.
https://doi.org/10.1021/ef9005737

Belošević S, Sijercic M, Crnomarković NĐ, Stanković BD, Tucaković DR. Numerical Prediction of Pulverized Coal Flame in Utility Boiler Furnaces. in Energy and Fuels. 2009;23(11):5401-5412.
doi:10.1021/ef9005737 .

Belošević, Srđan, Sijercic, Miroslav, Crnomarković, Nenad Đ., Stanković, Branislav D., Tucaković, Dragan R., "Numerical Prediction of Pulverized Coal Flame in Utility Boiler Furnaces" in Energy and Fuels, 23, no. 11 (2009):5401-5412,
https://doi.org/10.1021/ef9005737 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Sijercic, Miroslav
AU  - Tucaković, Dragan R.
AU  - Crnomarković, Nenad Đ.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3513
AB  - For prediction of complex processes in two-phase turbulent reactive flows within large-scale boiler furnaces firing pulverized coal, a comprehensive 3D differential mathematical model and CFD computer code have been developed in-house. The model incorporates trade-offs between submodels sophistication and computational practicality. An easy-to-use interface for introducing input data and grid generation has been build within the code. The main purpose of the paper is to present numerical predictions of processes in the case-study furnace under different operating conditions, obtained by the developed model. The paper also provides information on characteristics and evaluation of the model, with a grid refinement study and comparisons with comprehensive data. The effects of different operating conditions on the processes in the case-study furnace are correctly predicted, demonstrating the ability of the developed model to perform parametric studies. (c) 2008 Elsevier Ltd. All rights reserved.
T2  - Fuel
T1  - A numerical study of a utility boiler tangentially-fired furnace under different operating conditions
VL  - 87
IS  - 15-16
SP  - 3331
EP  - 3338
DO  - 10.1016/j.fuel.2008.05.014
ER  - 

@article{
author = "Belošević, Srđan and Sijercic, Miroslav and Tucaković, Dragan R. and Crnomarković, Nenad Đ.",
year = "2008",
abstract = "For prediction of complex processes in two-phase turbulent reactive flows within large-scale boiler furnaces firing pulverized coal, a comprehensive 3D differential mathematical model and CFD computer code have been developed in-house. The model incorporates trade-offs between submodels sophistication and computational practicality. An easy-to-use interface for introducing input data and grid generation has been build within the code. The main purpose of the paper is to present numerical predictions of processes in the case-study furnace under different operating conditions, obtained by the developed model. The paper also provides information on characteristics and evaluation of the model, with a grid refinement study and comparisons with comprehensive data. The effects of different operating conditions on the processes in the case-study furnace are correctly predicted, demonstrating the ability of the developed model to perform parametric studies. (c) 2008 Elsevier Ltd. All rights reserved.",
journal = "Fuel",
title = "A numerical study of a utility boiler tangentially-fired furnace under different operating conditions",
volume = "87",
number = "15-16",
pages = "3331-3338",
doi = "10.1016/j.fuel.2008.05.014"
}

Belošević, S., Sijercic, M., Tucaković, D. R.,& Crnomarković, N. Đ.. (2008). A numerical study of a utility boiler tangentially-fired furnace under different operating conditions. in Fuel, 87(15-16), 3331-3338.
https://doi.org/10.1016/j.fuel.2008.05.014

Belošević S, Sijercic M, Tucaković DR, Crnomarković NĐ. A numerical study of a utility boiler tangentially-fired furnace under different operating conditions. in Fuel. 2008;87(15-16):3331-3338.
doi:10.1016/j.fuel.2008.05.014 .

Belošević, Srđan, Sijercic, Miroslav, Tucaković, Dragan R., Crnomarković, Nenad Đ., "A numerical study of a utility boiler tangentially-fired furnace under different operating conditions" in Fuel, 87, no. 15-16 (2008):3331-3338,
https://doi.org/10.1016/j.fuel.2008.05.014 . .

TY  - JOUR
AU  - Tucaković, Dragan R.
AU  - Živanović, Titoslav
AU  - Stevanović, Vladimir
AU  - Belošević, Srđan
AU  - Galic, Radoslav
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3538
AB  - One of the main tasks during the design or simulation and analyses of the utility steam boiler operation is the prediction of a distribution of mill gases and hot air flow rates between burners sections. These are the boundary conditions for the combustion process in the boiler furnace, and they strongly influence the steam boiler economy and reliability of operation. A computer code for the prediction of mill gases and hot air distribution between boiler burners has been developed. The code is based on simultaneous calculations of material and heat balances for the fail mill and corresponding air tracts. This paper presents a methodology of performed calculations, the code structure, and results obtained for the steam boiler furnace of 350 MWe thermal power plant equipped with eight fall mills. (C) 2008 Elsevier Ltd. All rights reserved.
T2  - Applied Thermal Engineering
T1  - A computer code for the prediction of mill gases and hot air distribution between burners sections at the utility boiler
VL  - 28
IS  - 17-18
SP  - 2178
EP  - 2186
DO  - 10.1016/j.applthermaleng.2007.12.021
ER  - 

@article{
author = "Tucaković, Dragan R. and Živanović, Titoslav and Stevanović, Vladimir and Belošević, Srđan and Galic, Radoslav",
year = "2008",
abstract = "One of the main tasks during the design or simulation and analyses of the utility steam boiler operation is the prediction of a distribution of mill gases and hot air flow rates between burners sections. These are the boundary conditions for the combustion process in the boiler furnace, and they strongly influence the steam boiler economy and reliability of operation. A computer code for the prediction of mill gases and hot air distribution between boiler burners has been developed. The code is based on simultaneous calculations of material and heat balances for the fail mill and corresponding air tracts. This paper presents a methodology of performed calculations, the code structure, and results obtained for the steam boiler furnace of 350 MWe thermal power plant equipped with eight fall mills. (C) 2008 Elsevier Ltd. All rights reserved.",
journal = "Applied Thermal Engineering",
title = "A computer code for the prediction of mill gases and hot air distribution between burners sections at the utility boiler",
volume = "28",
number = "17-18",
pages = "2178-2186",
doi = "10.1016/j.applthermaleng.2007.12.021"
}

Tucaković, D. R., Živanović, T., Stevanović, V., Belošević, S.,& Galic, R.. (2008). A computer code for the prediction of mill gases and hot air distribution between burners sections at the utility boiler. in Applied Thermal Engineering, 28(17-18), 2178-2186.
https://doi.org/10.1016/j.applthermaleng.2007.12.021

Tucaković DR, Živanović T, Stevanović V, Belošević S, Galic R. A computer code for the prediction of mill gases and hot air distribution between burners sections at the utility boiler. in Applied Thermal Engineering. 2008;28(17-18):2178-2186.
doi:10.1016/j.applthermaleng.2007.12.021 .

Tucaković, Dragan R., Živanović, Titoslav, Stevanović, Vladimir, Belošević, Srđan, Galic, Radoslav, "A computer code for the prediction of mill gases and hot air distribution between burners sections at the utility boiler" in Applied Thermal Engineering, 28, no. 17-18 (2008):2178-2186,
https://doi.org/10.1016/j.applthermaleng.2007.12.021 . .

TY  - JOUR
AU  - Belošević, Srđan
AU  - Sijercic, Miroslav
AU  - Oka, Simeon N.
AU  - Tucaković, Dragan R.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3051
AB  - This paper presents selected results of numerical simulations of processes in utility boiler pulverized coal tangentially fired dry-bottom furnace. The simulations have been performed by specially developed comprehensive mathematical model. The main features of the model are a three-dimensional geometry, k-epsilon gas turbulence model, Eulerian-Lagrangian approach, particles-to-turbulence interaction, diffusion model of particle dispersion, six-flux method for radiation modeling and pulverized coal combustion model based on the global particle kinetics and experimentally obtained kinetic parameters. Five operation regimes of 210 MW, boiler furnace burning Serbian lignites, with different grinding fineness of coal and coal quality, have been simulated. The model successfully predicts the influence of the parameters on the furnace processes and operation characteristics (like the flue gas temperature and the furnace walls radiation fluxes). The predicted flame temperature and percentage combustibles in bottom ash are in good agreement with the measurements. The developed model can find different applications, both in research and practice. (c) 2006 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Three-dimensional modeling of utility boiler pulverized coal tangentially fired furnace
VL  - 49
IS  - 19-20
SP  - 3371
EP  - 3378
DO  - 10.1016/j.ijheatmasstransfer.2006.03.022
ER  - 

@article{
author = "Belošević, Srđan and Sijercic, Miroslav and Oka, Simeon N. and Tucaković, Dragan R.",
year = "2006",
abstract = "This paper presents selected results of numerical simulations of processes in utility boiler pulverized coal tangentially fired dry-bottom furnace. The simulations have been performed by specially developed comprehensive mathematical model. The main features of the model are a three-dimensional geometry, k-epsilon gas turbulence model, Eulerian-Lagrangian approach, particles-to-turbulence interaction, diffusion model of particle dispersion, six-flux method for radiation modeling and pulverized coal combustion model based on the global particle kinetics and experimentally obtained kinetic parameters. Five operation regimes of 210 MW, boiler furnace burning Serbian lignites, with different grinding fineness of coal and coal quality, have been simulated. The model successfully predicts the influence of the parameters on the furnace processes and operation characteristics (like the flue gas temperature and the furnace walls radiation fluxes). The predicted flame temperature and percentage combustibles in bottom ash are in good agreement with the measurements. The developed model can find different applications, both in research and practice. (c) 2006 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Three-dimensional modeling of utility boiler pulverized coal tangentially fired furnace",
volume = "49",
number = "19-20",
pages = "3371-3378",
doi = "10.1016/j.ijheatmasstransfer.2006.03.022"
}

Belošević, S., Sijercic, M., Oka, S. N.,& Tucaković, D. R.. (2006). Three-dimensional modeling of utility boiler pulverized coal tangentially fired furnace. in International Journal of Heat and Mass Transfer, 49(19-20), 3371-3378.
https://doi.org/10.1016/j.ijheatmasstransfer.2006.03.022

Belošević S, Sijercic M, Oka SN, Tucaković DR. Three-dimensional modeling of utility boiler pulverized coal tangentially fired furnace. in International Journal of Heat and Mass Transfer. 2006;49(19-20):3371-3378.
doi:10.1016/j.ijheatmasstransfer.2006.03.022 .

Belošević, Srđan, Sijercic, Miroslav, Oka, Simeon N., Tucaković, Dragan R., "Three-dimensional modeling of utility boiler pulverized coal tangentially fired furnace" in International Journal of Heat and Mass Transfer, 49, no. 19-20 (2006):3371-3378,
https://doi.org/10.1016/j.ijheatmasstransfer.2006.03.022 . .