燃煤锅炉飞灰可燃物质量分数偏高的原因分析及对策

Analysis on reasons of higher mass fraction of combustible matter in fly ash of flue gas of coal-fired boiler and countermeasures

飞灰可燃物质量分数对燃煤机组经济性影响较大,在锅炉的热损失中,机械不完全燃烧热损失为2%,仅次于排烟热损失。贵州某电厂420 t/h锅炉投运以来,飞灰可燃物质量分数一直偏高,通过分析,找出了飞灰可燃物质量分数偏高的原因,对锅炉进行了燃烧调整及设备改造,飞灰可燃物质量分数大大下降,取得了良好的经济效果。

The mass fraction of the combustible matter in fly ash greatly influences on the economic efficiency of the coal-fired unit.In the heat loss of the boiler,the heat loss caused by mechanically incomplete combustion is about 2% and only less than the heat loss caused by the exhaust flue gas.Since the 420 t/h boiler of a power plant in Guizhou was put into operation,the mass fraction of combustible matter in the fly ash is always higher.According to analysis,the reasons of the higher mass fraction of combustible matter in fly ash were found.The boiler equipments were reformed,and the combustion in the boiler was adjusted.So the mass fraction of the combustible matter in fly ash had been decreased greatly;and favorable economic benefit was obtained.