Taking 300 MW CFB boiler in Huaibei Linhuan Power Plant as the object of study

the influence of mixedly burning coal slime upon boiler operation has been tested and studied.Results show that the bed temperature decreases

the differential pressure in upper furnace increases

the current of induced draft fan also increases after the coal slime being injected into the furnace;the response of coal slime system to load change is significantly faster than that of the coal system

the feeding mode of low-grade coal slime can't cause overtemperature in cyclone separator or post-combustion in tail section of the flue duct;along with the increase of coal slime amount going into the furnace

the carbon content in bottom slag becomes greater

however the carbon content in fly ash doesn't obviously change;when the bed temperature being controlled above 880 ℃

the carbon content in bottom slag will decrease significanly;after injection of coal slime

the temperautre of discharged flue gas will increase

and the boiler efficiency will decrease.