75t/h乏气送粉煤粉锅炉低氮燃烧改造

75 t/h Exhaust Pneumatic Convey Pulverized Coal Boiler Low NO_x Combustion Renovation

针对某电厂1#锅炉NO_x排放量过高、炉膛出口烟气温度偏差较大以及水冷壁结焦问题,采用低氧燃烧、增加燃尽风、深度空气分级等技术,对某电厂1#锅炉实施改造,改造后进行冷态试验和燃烧试验调整。改造后,经过配风试验,假想切圆达到设计要求,其他各参数也基本符合设计要求。1#炉改造前的NO_x排放值是700~850 mg/m^3(标态、干基、6%O_2),改造后降低到300 mg/m^3(标态、干基、6%O_2)以下,脱硝效率达到55%。锅炉的炉膛出口烟气温度偏差,也从改造前的大于100℃降低至50℃以下。经过持续的观察,炉膛水冷壁基本光滑无结焦,喷口附近有少量松散浮灰,可以轻易打掉,总的来说,锅炉改造后,达到了改造前的预想结果,改造是比较成功的。

Aiming at a power plant of 1 # boiler＇s problem of NOx emissions excessive, the furnace exit gas temperature deviation is large, and wall coking problems, transformation of the boiler in a power plant is carried out using low-oxygen combustion, overfire air deep air separated staging techniques. Transformation combustion test indicats： the NOx emission of 1# furnace is 700--850 mg/m^3 before the transfor- mation, and reduce to less than 300 mg/m^3 after transformation, NOx is reduced by more than 55%. The boiler furnace exit flue gas temper- ature deviation is reduced from more than 100℃ before the transformation to below 50℃. In general, after the boiler, to the desired results before the transformation, the transformation is more successful.