The raw coal is screened through a lattice screen from the raw coal yard and falls onto a high-angle belt conveyor or elevator. After the iron is removed by an electromagnetic iron remover, the belt conveyor or elevator sends the raw coal to the raw coal bunker for storage. After the pulverizing system has been started, open the rod valve at the bottom of the raw coal bunker, start the sealed metering belt coal feeder, and the raw coal enters the LM vertical coal mill for drying and grinding. The hot air or exhaust gas from the hot blast furnace enters the vertical coal mill under the extraction of the system fan. After sufficient heat exchange with the raw coal being ground in the mill, the coal powder is brought up and sorted in the separator. The coarse coal powder with unqualified fineness falls back on the grinding disc for grinding. The qualified coal powder enters the explosion-proof air box with the air flow and is collected by the pulse dust collector and unloaded into the coal powder bunker through the grid wheel. The debris in the raw coal, such as some gangue, metal blocks, etc., are discharged from the mill through the air ring and slag outlet. A CO-O2 online analysis system is installed throughout the entire process. When processing coal with a higher volatile content, safety measures such as nitrogen protection and a CO2 automatic fire extinguishing system can be set up.