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利用FLUENT数值软件对某电厂600 MW超临界前后墙对冲旋流燃煤锅炉进行了600℃时玉米秆气化气、稻秆气化气和小麦秆气化气再燃的数值模拟,研究了不同生物质气化气、再燃量对炉内燃烧、炉膛出口烟气温度及NO、CO2、CO生成的影响.结果表明:小麦秆气、玉米秆气、稻秆气的最大脱氮率分别是41%、40%、38%;随着生物质气体再燃量的增加炉膛出口CO2、NO排放浓度降低,温度和CO浓度升高;生物质气体再燃能有效降低NO排放浓度,而且对锅炉的正常运行影响较小;麦秆气、玉米秆气和稻秆气的脱氮率依次降低.
FLUENT numerical software was used to simulate the gasification of corn stalks, gasification of rice straw and gasification of wheat straw at 600 ℃ with 600 MW supercritical front-back wall hedge swirling coal-fired boilers. The results showed that the maximum denitrification rates of wheat straw gas, corn stalk gas and rice straw gas were 41% , 40% and 38%, respectively. With the increase of biomass gas reburning quantity, the CO2 and NO emission concentrations at the exit of the furnace decreased and the temperature and CO concentration increased. Biomass gas reburning could effectively reduce the NO emission concentration, Smaller; the denitrification rate of wheat straw gas, corn stalk gas and rice straw gas decreased in turn.