Coal gas treatment method for reducing charge level during medium repair of blast furnace

The invention belongs to the technical field of blast furnace medium repair, and relates to a blast furnace medium repair charge level lowering gas treatment method. After re-blowing, blowing down the material according to a planned material level ascending and descending, and starting to descend the material level after loading is completed; adjusting charge level reduction blast furnace parameters according to a plan, and regularly taking gas samples for inspection and testing, wherein the gas treatment flow is the same as normal production; after the gas components are detected to be unqualified, switching the gas treatment process into a raw gas treatment process; after the gas treatment process is switched, the charge level lowering operation is continued; and when the charge level is lowered to 0.5-1.0 m below the center line of the tuyere, the blast furnace is subjected to damping down. When the device is used for reducing the charge level in the blast furnace, blast furnace raw gas and furnace dust ca