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锅炉尾部低温空气预热器的堵灰,对电站锅炉安全、经济运行影响很大。由于低温空气预热器的堵灰,使受热面减少,锅炉排烟温度升高,降低了锅炉效率;堵灰后使烟气流动阻力增加,引风机电耗增加,严重时将造成吸风出力不足,影响机组额定出力;同时热风温度下降也会影响炉内燃烧及磨煤机出力。造成低温空气预热器下仓管箱堵灰的原因,主要是由于烟气中含有三氧化硫(SO_3)以及空预器管壁温度低于烟气露点,造成管子内壁结露,粘附灰粒,逐渐堵塞烟道。如高井电厂燃用含硫量为0.8—1.3%的煤种,在1974—1981年对
Boiler tail low temperature air preheater plug ash, power station boiler safety, economic impact of a great deal. Due to the clogging ash of the low-temperature air preheater, the heated surface is reduced and the temperature of the exhaust gas of the boiler is increased, which reduces the boiler efficiency; the flow resistance of the flue gas increases after the clogging of the ash and the power consumption of the induced draft fan increases; Insufficient, affecting the unit rated output; the same time, the hot air temperature will also affect the furnace combustion and coal mill output. The reason for the blockage of ash in the storage tank under the low-temperature air preheater is mainly due to the sulfur trioxide (SO 3) contained in the flue gas and the temperature of the air preheater tube wall being lower than the dew point of the flue gas, causing dew condensation on the inner wall of the pipe and adhering ash Grains, gradually plug the flue. For example, Gaojing Power Plant burned coal with a sulfur content of 0.8-1.3% during the period of 1974-1981