The by-product of iron and steel enterprises-blast furnace gas and coke oven gas is very important secondary energy, but a lot of iron and steel enterprises in China, the recovery rate is very low and gas emission serious. 钢铁企业的副产品-高炉煤气和焦炉煤气是很重要的二次能源,但是我国很多钢铁企业煤气的回收率很低且放散严重。