高水分煤在流化床中燃烧时NO_x的排放特性

通过数值计算，研究了高水分煤在流化床中燃烧时ＮＯ的排放特性及其形成的主要影响因素。结果表明煤中的水分，床内的ＣＯ浓度和空－燃比等都对于ＮＯ转换率有较大影响。

NOx Emissions Characteristics During the Combustion of High moisture Coals in Fluidized Bed Combustors

Through numerical calculations the NO emissions characteristics of high moisture coals during their combustion in fluidized bed combustors (FBC) have been studied with main influencing factors being identified. The study results show that the water content in coal, CO concentration and air fuel ratio in the bed all have a significant effect on the NO conversion rate. With an increase in moisture content in the bed there emerged an increase in CO concentration, leading to a reduction in NO conversion rate. With a reduction in the air fuel ratio the NO conversion rate will also decrease. Through the observation of accumulated reaction rates for NO formation and reduction it can be shown that the main factor influencing the NO emissions is the CO concentration and char content in the bed, while H 2 concentration has little effect on NO reaction.