以某台90 t/h 链条炉为研究对象,运用 Fluent 软件对炉内的流动传热、气相燃烧过程进行模拟,得到炉内的速度场和温度场,并由此确定了炉膛中上部为适宜进行选择性非催化还原(SNCR)烟气脱硝的区域,进而结合该链条炉炉膛空间较大的特点,将喷氨口位置选定在前墙5．7 m 高度处,沿宽度方向均匀布置8个喷氨口.对 SNCR 烟气脱硝系统进行数值模拟,结果表明：氨水液滴的喷射速度为40 m/s,n(NH3)∶n(NO)为1．5,NH3总消耗量为0．00258 kg/s,氨水液滴直径为60μm 时,还原剂 NH3和 NO 反应最充分,NO 脱除效率最高,为42．3％.%Taking a 90 t/h travelling grate boiler as the research object,the Fluent software was applied to simulate the flowing heat transfer and gas phase combustion in the furnace.The velocity field and tempera-ture field in the furnace was obtained and the middle-upper part of the furnace was identified as the proper area for selective non-catalytic reduction (SNCR)denitration.Considering the furnace space is adequate, the ammonia injection point was located at the place of 5.7 m high on the front wall and a total of 8 ammo-nia injection points were regularly arranged along the width of the furnace.On this basis,numerical simula-tion on the SNCR denitration system was carried out.The results show that,under the condition with the ammonia spraying velocity of 40 m/s,the ammonia droplet diameter of 60 μm,the molar ratio of NH 3 to NO of 1.5 and the total NH 3 consumption of 0.002 58 kg/s,the reaction between NH 3 and NO was the most complete and the NO removal rate reached the highest,42.3%.
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