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

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

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

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

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

TY  - JOUR
AU  - 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  - 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  - 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 . .