Title :
Numerical simulation of the effect of over-fire air on NOx formation in furnace
Author :
Dinghui Wang ; Erpeng Duan ; Yonghong Guo ; Baomin Sun ; Tao Bai
Author_Institution :
Key Lab. of Condition Monitoring & Control for Power Plant Equip., North China Electr. Power Univ., Beijing, China
Abstract :
Numerical simulations were conducted for an 800MW ultra-supercritical utility boiler. The influences of over-fire air on distributions of temperature, oxygen concentration and NOx concentration were investigated. The results indicate that the using of OFA made a significant influence on parameters in the primary combustion zone. The temperature, oxygen concentration and NOx concentration all decreased here. In addition, Fuel NOx and Thermal NOx were analyzed individually. The formation of Fuel NOx was mainly affected by temperature and oxygen concentration. Thermal NOx increased dramatically with increasing temperature when the temperature exceeded a certain value. According to the result of simulation, the NOx concentration at furnace exit decreased 31.4% comparatively using OFA.
Keywords :
boilers; coal; furnaces; nitrogen compounds; temperature distribution; NOx concentration; fuel NOx formation; furnace; numerical simulations; over-fire air; oxygen concentration; primary combustion zone; temperature distribution; thermal NOx; ultra-supercritical utility boiler; Boilers; Coal; Combustion; Furnaces; Mathematical model; Temperature distribution; NOx; numerical simulation; over-fire air;
Conference_Titel :
Materials for Renewable Energy and Environment (ICMREE), 2013 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-3335-8
DOI :
10.1109/ICMREE.2013.6893790
