With the 90t/h chain grate stoker as the research object to simulate and calculate the gas combustion in the stoker, the study figured out the distribution of temperature field, velocity field and the flue gas group inside the stoker. Based on that find-ing, the study proposed the view of positioning the ammonia injection point on the front wall of the stoker, which saves the invest-ment and the expense on operating. The research is expected to provide some reference for the optimized operation of SNCR simu-lation of the chain grate stoker.%以某90 t/h链条炉为研究对象，对炉内气相燃烧进行数值模拟计算，得出炉膛内的速度场、温度场及烟气组分场分布。根据上述结果，提出了在炉膛前墙处设置喷氨口的观点，节约了投入及运行费用。对链条炉SNCR的优化运行具有一定的指导意义。
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