Simulation on Temperature Distribution in Reduction Zone of Iron Ore Hydrogen DR Shaft Furnace

Based on the technical and process parameters of BL shaft furnace,a gas-solid phases heat transfer model was built for simulation together with Fluent software.The pellets were taken as porous media and movement of pellets had been simulated through sliding mesh method.Reduction reactions involved in the calculation using the three-step reaction,we can get the temperature field and thermal efficiency in the reduction zone of hydrogen DRI shaft furnace.The results showed that with the increase of the hydrogen flow,the temperature gradient of reduction zone became narrow,the temperature of the reduction gas at the outlet was higher and the thermal efficiency of the reduction gas decreased.The percentage of reduced products as a function of distance from shaft inlet can be simulated.It indicated that the simplified gas-solid heat transfer model can be used to analyze the temperature field and reactants in the reduction zone of hydrogen DRI shaft furnace.