Predicting effects of air staging application on existing coal-fired power steam boiler
Само за регистроване кориснике
2019
Чланак у часопису (Објављена верзија)
,
© 2018 Elsevier Ltd
Метаподаци
Приказ свих података о документуАпстракт
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 des...igned 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
Кључне речи:
Steam boiler / Air staging / NOx / Efficiency / SafetyИзвор:
Applied Thermal Engineering, 2019, 149, 665-677Финансирање / пројекти:
- Повећање енергетске и еколошке ефикасности процеса у ложишту за угљени прах и оптимизација излазне грејне површине енергетског парног котла применом сопствених софтверских алата (RS-MESTD-Technological Development (TD or TR)-33018)
DOI: 10.1016/j.applthermaleng.2018.12.070
ISSN: 1359-4311
WoS: 000460492300059
Scopus: 2-s2.0-85058562325
URI
https://linkinghub.elsevier.com/retrieve/pii/S135943111737196Xhttps://vinar.vin.bg.ac.rs/handle/123456789/8000
Колекције
Институција/група
VinčaTY - 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 . .