The invention belongs to the technical field of
metallurgy, and in particular relates to a cooling gas
system used in the cooling section of a
shaft furnace. The cooling gas
system includes a cooling gas intake pipeline, a cooling gas intake pipeline, a cooling and dust removal device, a pressure raising device, an intake switching valve group, a
carburizing gas device, and a furnace bottom material
temperature measurement device, wherein the cooling gas intake pipeline Including the intake ring
pipe and multiple air inlets; the cooling air collection pipeline includes the air collection ring
pipe, multiple air collection ports and multiple air collection hoods; the cooling and dust removal device is connected to the furnace outlet; the air inlet of the intake switching valve group They are respectively connected with the pressure raising device and the
carburizing gas device, and the gas outlet is connected with the furnace inlet; the furnace bottom material temperature measuring device is arranged under the inlet pipeline. Therefore, the cooling air
system adopts multiple air inlets, multiple air intake ports and air intake hoods evenly distributed in the ring
pipe, which ensures the uniformity of air intake in the cooling section and realizes efficient
recovery of cooling air, thus reducing the unused cooling air. Effective
recovery and rising to the reduction section will adversely affect the reduction reaction.