Process Features of ZXHT Hydrogen-based Shaft Furnace
The hydrogen-based shaft furnace of Zhangxuan High Technology is the first one in the world that produces DRI by using COG.Its designed ore ratio is 1.350,C content of DRI＜3.0％,metallization rate ≥92％,COG consumption＜650m3/t,productivity 3.50t/(m3·d),and annual output amounts to 550,000t/a.COG,the by-product of Xuansteel Coking Plant,is adopted as the reducing gas,which is heated to 920-960℃ in the heating furnace,and then reheated to 1000-1050℃ in the combustion chamber by oxygen injection before supplying to the shaft furnace to reduce high-quality pellets.The production process of this kind of furnace features hydrogen direct reduction,simple process flow,good adaptabili-ty to raw materials,diversified products,and high utilization rate of hydrogen energy.Compared with blast furnaces of the same output,its CO2 emission is reduced by 58.8％approximately,dust emission drops by 90％,and SO2 emission is decreased by 50％.
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