Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler
Samo za registrovane korisnike
2012
Autori
Belošević, Srđan V.Beljanski, Vladimir
Tomanović, Ivan
Crnomarković, Nenad
Tucaković, Dragan
Živanović, Titoslav
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
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 t...he 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.
Izvor:
Energy & Fuels, 2012, 26, 1, 425-442Izdavač:
- Amer Chemical Soc, Washington
Finansiranje / 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)
- Electric Power Industry of Serbia
DOI: 10.1021/ef201380z
ISSN: 0887-0624
WoS: 000299583400046
Scopus: 2-s2.0-84855919695
Institucija/grupa
Inovacioni centarTY - JOUR AU - Belošević, Srđan V. AU - Beljanski, Vladimir AU - Tomanović, Ivan AU - Crnomarković, Nenad AU - Tucaković, Dragan AU - Živanović, Titoslav PY - 2012 UR - https://machinery.mas.bg.ac.rs/handle/123456789/1363 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. PB - Amer Chemical Soc, Washington T2 - Energy & Fuels T1 - Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler EP - 442 IS - 1 SP - 425 VL - 26 DO - 10.1021/ef201380z ER -
@article{ author = "Belošević, Srđan V. and Beljanski, Vladimir and Tomanović, Ivan and Crnomarković, Nenad and Tucaković, Dragan 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.", publisher = "Amer Chemical Soc, Washington", journal = "Energy & Fuels", title = "Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler", pages = "442-425", number = "1", volume = "26", doi = "10.1021/ef201380z" }
Belošević, S. V., Beljanski, V., Tomanović, I., Crnomarković, N., Tucaković, D.,& Živanović, T.. (2012). Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler. in Energy & Fuels Amer Chemical Soc, Washington., 26(1), 425-442. https://doi.org/10.1021/ef201380z
Belošević SV, Beljanski V, Tomanović I, Crnomarković N, Tucaković D, Živanović T. Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler. in Energy & Fuels. 2012;26(1):425-442. doi:10.1021/ef201380z .
Belošević, Srđan V., Beljanski, Vladimir, Tomanović, Ivan, Crnomarković, Nenad, Tucaković, Dragan, Živanović, Titoslav, "Numerical Analysis of NOx Control by Combustion Modifications in Pulverized Coal Utility Boiler" in Energy & Fuels, 26, no. 1 (2012):425-442, https://doi.org/10.1021/ef201380z . .