Prediction method for temperature distribution in reduction section of gas-based direct reduced iron shaft furnace

Junli Ge, Minghua Bai, Honglia

Abstract

Temperature distribution plays a crucial role in the process of direct reduced iron (DRI) production. Based on Baogang and Lunan (BL) semi-industrial equipment and process parameters, a gas-solid heat transfer model is established to study the temperature field in the reduction section of gas-based DRI shaft furnace. In the case of different reduction gas quantities in reduction section of DRI shaft furnace, iron ore pellets are simplified as porous media for the convenience of temperature field analysis with consideration of chemical reaction heat. The numerical results show that the thermal efficiency of the reduction gas decreases with the increasing of the reduction gas quantity, but the DRI shaft furnace top gas temperature increases. Meanwhile the numerical results have a good agreement with BL experimental ones, which indicates that the simplified gas-solid heat transfer model can be used to predict the temperature distribution effectively in reduction section of gas-based DRI shaft furnace.