循环流化床锅炉深调负荷二次风对NOx生成量的影响研究OA

In response to the problem of NOx exceeding the standard in circulating fluidized bed(CFB)boilers under deep adjustment load,the internal flow field of CFB boilers is numerically simulated using fluent software.It studies the flow characteristics of circulat-ing fluidized bed boilers,and analysizes the factors leading to NOx exceeding the standard under low load conditions.The results indi-cate that the combustion of fuel is mainly concentrated in the dense phase region,where particle flow exhibits a typical"ring core"structure.The large amount of NO generation is concentrated in this position,and the CO concentration in the dense phase region will inhibit the generation of NO.Through multiple numerical analyses and calculations,the optimal air distribution ratio is determined to be a primary air rate of 4,with the lowest NO generation at a secondary air rate of 6,which is most conducive to achieving ultra-low NOx emissions.