Abstract：Fully exploit byproduct gas in the steelworks plays a great role on reducing energy consumption and environmental load of steel industry. A new process was put forth: injection of cold blast furnace top gas, basic oxygen furnace gas and coke oven gas into blast furnace tuyeres. This process is numerically simulated by multifluid model under constant raceway temperature, both gas flow rate and hot metal temperature on slag surface. Model simulations revealed that: in comparison to conventional operation, with the injection of BF, BOF and coke oven gases, the temperature level tends to decrease in the shaft, infurnace CO and/or H2 concentration are evidently enhanced, and the reduction of ironbearing burden is accelerated. Furthermore, the productivity increases while heat efficiency improves under injection of three kinds of reducing gases. The effects of coke oven gas injection are much more remarkable, and less CO2 emission for blast furnace unit is available. If the relevant technologies including commercially manufacturing of process oxygen are feasible, the innovative process of reducing gas injection will possess broad potential for the practical application.
