Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control
Apstrakt
A cost-effective reduction of NO, emission from utility boilers firing pulverized coal can be achieved by means of combustion modifications in the furnace. It is also essential to provide the pulverized coal dfffitsion flame control. Mathematical modeling is regularly used for analysis and optimization of complex turbulent reactive flows and mutually dependent processes in coal combustion furnaces. In the numerical study, predictions were performed by an in-house developed comprehensive three-dimensional differential model of flow, combustion and heat/mass transfer with submodel of the fuel- and thermal-NO formation/destruction reactions. Influence of various operating conditions in the case-study utility boiler tangentially fired furnace, such as distribution of both the fuel and the combustion air over the burners and tiers, fuel-bound nitrogen content and grinding fineness of coal were investigated individually and in combination. Mechanisms of NO formation and depletion were found ...to be strongly affected by flow, temperature and gas mixture components concentration fields. Proper modifications of combustion process can provide more than 30% of the NO, emission abatement, approaching the corresponding emission limits, with simultaneous control of the flame geometry and position within the furnace. This kind of complex numerical experiments provides conditions for improvements of the power plant furnaces exploitation, with respect to high efficiency, operation flexibility and low emission.
Ključne reči:
modeling / turbulent two-phase reactive flow / tangential firing of pulverized coal / combustion modifications / NOx and flame controlIzvor:
Thermal Science, 2017, 21, S597-S615Finansiranje / projekti:
- Povećanje energetske i ekološke efikasnosti procesa u ložištu za ugljeni prah i optimizacija izlazne grejne površine energetskog parnog kotla primenom sopstvenih softverskih alata (RS-MESTD-Technological Development (TD or TR)-33018)
Napomena:
- Turbulence Workshop, Aug 31-Sep 02, 2015, Univ Belgrade, Fac Mech Engn, Belgrade, Serbia
DOI: 10.2298/TSCI160604186B
ISSN: 0354-9836; 2334-7163
WoS: 000418781900007
Scopus: 2-s2.0-85041682456
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Belošević, Srđan AU - Tomanović, Ivan D. AU - Crnomarković, Nenad Đ. AU - Milićević, Aleksandar PY - 2017 UR - https://vinar.vin.bg.ac.rs/handle/123456789/7187 AB - A cost-effective reduction of NO, emission from utility boilers firing pulverized coal can be achieved by means of combustion modifications in the furnace. It is also essential to provide the pulverized coal dfffitsion flame control. Mathematical modeling is regularly used for analysis and optimization of complex turbulent reactive flows and mutually dependent processes in coal combustion furnaces. In the numerical study, predictions were performed by an in-house developed comprehensive three-dimensional differential model of flow, combustion and heat/mass transfer with submodel of the fuel- and thermal-NO formation/destruction reactions. Influence of various operating conditions in the case-study utility boiler tangentially fired furnace, such as distribution of both the fuel and the combustion air over the burners and tiers, fuel-bound nitrogen content and grinding fineness of coal were investigated individually and in combination. Mechanisms of NO formation and depletion were found to be strongly affected by flow, temperature and gas mixture components concentration fields. Proper modifications of combustion process can provide more than 30% of the NO, emission abatement, approaching the corresponding emission limits, with simultaneous control of the flame geometry and position within the furnace. This kind of complex numerical experiments provides conditions for improvements of the power plant furnaces exploitation, with respect to high efficiency, operation flexibility and low emission. T2 - Thermal Science T1 - Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control VL - 21 SP - S597 EP - S615 DO - 10.2298/TSCI160604186B ER -
@article{ author = "Belošević, Srđan and Tomanović, Ivan D. and Crnomarković, Nenad Đ. and Milićević, Aleksandar", year = "2017", abstract = "A cost-effective reduction of NO, emission from utility boilers firing pulverized coal can be achieved by means of combustion modifications in the furnace. It is also essential to provide the pulverized coal dfffitsion flame control. Mathematical modeling is regularly used for analysis and optimization of complex turbulent reactive flows and mutually dependent processes in coal combustion furnaces. In the numerical study, predictions were performed by an in-house developed comprehensive three-dimensional differential model of flow, combustion and heat/mass transfer with submodel of the fuel- and thermal-NO formation/destruction reactions. Influence of various operating conditions in the case-study utility boiler tangentially fired furnace, such as distribution of both the fuel and the combustion air over the burners and tiers, fuel-bound nitrogen content and grinding fineness of coal were investigated individually and in combination. Mechanisms of NO formation and depletion were found to be strongly affected by flow, temperature and gas mixture components concentration fields. Proper modifications of combustion process can provide more than 30% of the NO, emission abatement, approaching the corresponding emission limits, with simultaneous control of the flame geometry and position within the furnace. This kind of complex numerical experiments provides conditions for improvements of the power plant furnaces exploitation, with respect to high efficiency, operation flexibility and low emission.", journal = "Thermal Science", title = "Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control", volume = "21", pages = "S597-S615", doi = "10.2298/TSCI160604186B" }
Belošević, S., Tomanović, I. D., Crnomarković, N. Đ.,& Milićević, A.. (2017). Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control. in Thermal Science, 21, S597-S615. https://doi.org/10.2298/TSCI160604186B
Belošević S, Tomanović ID, Crnomarković NĐ, Milićević A. Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control. in Thermal Science. 2017;21:S597-S615. doi:10.2298/TSCI160604186B .
Belošević, Srđan, Tomanović, Ivan D., Crnomarković, Nenad Đ., Milićević, Aleksandar, "Modeling of Pulverized Coal Combustion for In-Furnace Nox Reduction and Flame Control" in Thermal Science, 21 (2017):S597-S615, https://doi.org/10.2298/TSCI160604186B . .