300 MW机组双进双出磨煤机分离器改造优化

Separator transformation and optimization of double-inlet and double-outlet coal mill for a 300 MW unit

石家庄良村热电有限公司300 MW机组锅炉采用MGS4062型双进双出磨煤机,随着煤质的下降和入炉煤杂物的增多,配套的径向挡板型分离器存在严重堵塞问题,影响机组带负荷能力。通过将分离器改造为双级轴向型,并在出粉口和回粉斜管上加装杂物过滤装置,实现磨煤机正常出力条件下煤粉均匀性指数≥1,磨煤单耗下降12.2%,磨煤机出力提高36%以上;同时,煤粉中的杂物能被过滤和清理出来,避免堵塞一次风管和锁气器。

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.