Direct combustion utilization system for upgrading gasification fine slag pulverized coal furnace and operation method of direct combustion utilization system

The invention discloses an upgrading gasification fine slag pulverized coal furnace direct combustion utilization system and an operation method thereof.The system comprises a sorting machine arranged at the tail end of a gasification fine slag conveying device, a drying cylinder is arranged at an upgrading gasification fine slag discharging port of the sorting machine, and a coal mill is arranged at a gasification fine slag discharging port of the drying cylinder; a material mixer is arranged at the discharging end of the coal mill, a crusher is further arranged at the feeding end of the material mixer, the discharging end of the material mixer is communicated to a direct-fired boiler through a combustor, a primary air pipeline is arranged right opposite to the combustor, and a high-temperature flue gas outlet of the direct-fired boiler is communicated to the drying cylinder. According to the invention, through the upgrading of the gasified fine slag, the mixing of the high-volatile material, the full prehea