400 t/d循环流化床垃圾焚烧锅炉改造的设计和运行

Design and Operation of 400 t/d MSW CFB Incineration Boiler

为解决某400 t/d循环流化床垃圾焚烧锅炉燃烧恶化、炉膛冒正压、CO排放超标等问题,提出系统燃烧优化改造方案。改造后的流化床垃圾焚烧锅炉垃圾处理量、蒸发量达到设计改造要求;炉膛内焚烧温度达到870℃以上,烟气停留时间大于5 s,CO的24 h排放均值和炉渣热灼减率分别为23.24 mg/m^3和0.35%,燃烧效率达到99%以上;排放烟气中污染物指标均低于《生活垃圾焚烧污染控制标准》(GB 18485—2014)中的限值。改造后的焚烧锅炉燃烧稳定,达到了燃烧优化目标,改造思路可以为循环流化床垃圾焚烧锅炉燃烧优化设计与改造提供借鉴与参考。

In order to solve the problems of positive pressure, burning unstably and higher CO emission than national standard of a 400 t/d circulating fluidized bed(CFB), a systematic retrofit plan to optimize combustion is proposed. After the retrofit the MSW disposal and steam capacity of the CFB incinerator meet the designed value;and the incineration temperature in the furnace is remained above 870 ℃, and the residence time of the flue gas in furnace was more than 5 seconds;the 24-hour average emission value of CO and the loss of ignition of slag were 23.24 mg/m^3 and 0.35% respectively, and the combustion efficiency was higher than 99%;moreover, the pollutants in the flue gas are all lower than the emission limit of the Municipal Solid Waste Incineration Pollution Control Standard GB18485-2014. The combustion is stable, and the optimization target was completely achieved. This retrofit method can be referred by the combustion optimization design and retrofit of the other MSW CFB boilers.