The total sulfur content of blast furnace gas is about 100~200 mg/m3,it cannot meet the environmental protection emission limit requirements of industrial furnaces after combustion.In the pa-per,a new dry desulfurization technology of blast furnace gas with carbonyl sulfur conversion device at the rear end of TRT is proposed and applied in an iron and steel company.The operation results show that the sulfur content of the treated blast furnace gas can reach less than 5 mg/m3,which meets the requirements of directly reaching the emission standard after combustion of blast furnace gas.