以1台220 t/h四角切圆煤粉炉为研究对象,采用CFD计算软件Fluent6.2对天然气再燃系统的喷射方式进行了数值模拟.研究了再燃气体及燃尽风采用切向喷射和前后墙对冲喷射对炉内NOx和CO浓度分布、温度分布以及气流旋流数的影响.结果表明:再燃气体及燃尽风的喷射方式对炉内CO浓度分布和温度分布的影响不大,但再燃气体及燃尽风采用对冲喷射时,降低NOx排放的效果好于切向喷射,并有利于减小炉膛出口气流的旋流数. A 220 t / h tangentially-fired pulverized coal fired furnace was taken as the research object, and the CFD calculation software Fluent 6.2 was used to simulate the injection mode of the natural gas reburning system.The effects of the tangential injection and front-to-back injection The influence of wall hedge injection on the concentration and temperature distribution of NOx and CO in the furnace and the swirling number of the gas flow were investigated.The results show that the effect of the injection mode of the re-combusted gas and the combustion air on the CO concentration and temperature distribution in the furnace is not significant, Gas and burnout When hedging is used, the effect of reducing NOx emission is better than that of tangential injection, and it is helpful to reduce the swirl number of the outlet airflow in the furnace.