Coal feeding system for wide-load denitration technology of CFB (circulating fluid bed) boiler heat supply unit

The utility model relates to a coal feeding system for a CFB boiler heat supply unit wide-load denitration technology. The coal feeding system comprises a hearth, a coal bunker used for storing fire coal and a coal feeder used for transporting the fire coal in the coal bunker into the hearth. One path of cold primary air led out by the primary fan is communicated with a coal conveying pipeline of the coal feeder through an air duct, and the cold primary air is used as coal conveying air; the other path of cold air led out by the primary fan is used as coal spreading air after being heated by the air preheater, and is communicated with a coal inlet of the hearth through an air duct; and the coal spreading air is used for uniformly spreading fire coal sent out from an outlet of the coal conveying pipeline of the coal feeder into the hearth. The fire coal conveying pipeline has the effect that the situation that the pipeline is prone to being blocked when fire coal is conveyed can be improved. 本申请涉及用于CFB锅炉供热机组宽负