摘要
针对吴泾电厂和台山电厂2台炉型相同、结构基本一致的600MW亚临界锅炉在运行中存在NOx排放不一致的问题,采用数值计算方法进行了分析.结果表明:表征炉膛气氛的CO浓度分布与NOx排放存在密切关系;配风方式决定了炉膛内氧化还原性气氛的分布,并影响NOx的生成和排放;增大炉膛上部燃烧器喷口的风量有利于在炉膛下部形成还原性气氛,从而降低NOx的排放,但其缺点是会导致燃烧效率下降,因此需综合考虑各种因素后采用适当的锅炉配风方式.
Aiming at the problem of noncoincidence of NOx, emission of two 600 MW subcritical boilers in operation with same furnace appearance and structure, analysis was earried out by numerical caleulation method. Results show that there is close relationship between CO concentration, which stands for the furnace atmosphere, and NOx emission. Air distribution mode determines the oxidizing and redueing atmosphere distribution in the furnace, thus it has effect on NOx formation and emission. Increasing the air flow rate of upper burners will be helpful to form reducing atmosphere in the lower part of the furnace and reduce NOx emission, while combustion efficiency will be decreased. In order to adopt proper air distribution mode for boiler, all the factors should be comprehensively considered.
出处
《动力工程学报》
CAS
CSCD
北大核心
2010年第6期405-408,414,共5页
Journal of Chinese Society of Power Engineering
关键词
电站锅炉
配风方式
CO浓度分布
NOX排放
数值计算
utility boiler
air distribution mode
CO concentration distribution
NOx emission
numerieal calculation
