Abstract:

:For the 300MW boiler in Shijiazhuang Liangcun Thermal Power Company Limited, a MGS4062 type doubleinlet and doubleoutlet coal mill is adopted. As the declining of coal quality and the increasing of coal impurities, there is a serious blocking problem for the matched radial baffle type separator, which influences the unit load capacity. Through transforming the separator into a twostage axial type and adding impurity filters at powder outlet and inclined powder returning pipe, the pulverized coal uniformity index is greater than or equal to 1, coal mill unit consumption decreases by 12.2% and coal mill capacity increases by 36% under normal capacity condition. Meanwhile, the impurities of coal are filtered and cleaned out to avoid blocking the primary air pipe and clapper.