Coal gas recycling device for blast furnace by dry method dust collecting

The utility model relates to a coal gas recycling device for a blast furnace by dry method dust collecting. The coal gas recycling device comprises a blast furnace body, a furnace top water-spraying gun, a furnace top blow off valve, a furnace top water-spraying control system, a coal gas gravity dust collector, a bag-type dust collector, a blast furnace air supply device, a blast furnace air supply control system, a pressure reducing valve block and a furnace top pressure control system, wherein the furnace top water-spraying gun is installed at a part above a blast furnace material level of the blast furnace body to spray water into the furnace; a coal gas outlet at the top of the blast furnace body is connected with the coal gas gravity dust collector after passing through a pipeline; the blast furnace air supply device is connected with the lower part of the blast furnace body; a blast furnace air supply control cabinet is electrically connected with the blast furnace air supply device; and a furnace top pressure control cabinet is electrically connected with a furnace top valve and the pressure reducing valve block. The coal gas recycling device satisfies the control requirement on the coal gas temperature in the processes of blowing out the blast furnace and descending the material level, achieves the purposes of blowing out quickly and recycling a large amount of coal, and is used for reducing the pollution of blast furnace gas emission to the atmosphere while benefits are created for enterprises.