Research On Temperature Field And Flow Field In The Hydrogen Direct Reduction Shaft Furnace Reduction

Traditional blast furnace has the characteristics of high energy consumption,seriously polluted and long process flow, the blast furnace ironmaking, such as direct reduction ironmaking can get rid of the dependence on coke, direct reduction ironmaking is a good short process of ironmaking process. The development of electric furnace steelmaking needs high quality scrap, direct reduced iron is the product of shaft furnace ironmaking, it is a good substitute for scrap.My job is study the existing shaft furnace ironmaking process, mainly process is Midrex, I analyzed the reaction thermodynamics of shaft furnace in air flow distribution and problems. The research content mainly includes that the minimum direct reduction gas of reduction in the process was analyzed, and analyzes the main factors influencing the direct reduction rate. Analysis of main way is that the angle of thermodynamics reaction gibbs free energy and equilibrium constant, theoretical maximum output and thermodynamic temperature.To establish the DRI shaft furnace reducing period of physical model based on the study of MIDREX. The reduction process of gas-solid heat transfer model was solved numerically using FLUENT software, Obtained that the temperature distribution situation of DRI reduction period of shaft furnace, the thermal efficiency of the DRI reduction shaft furnace. So that temperature distribution have influence on Reduction volume, reduction temperature, pressure of reduction gas.Using the FLUENT software to simulate the flow field inside the reduction period, in the simulation analysis pellets are simplified as porous media, the distribution of reducing gas flow and relative influencing factors in DRI shaft furnace are studied in this paper. The results show that the airflow distribution in the furnace has a direct relationship with the state of the factors which include the furnace top pressure and inlet velocity, the reasonable distribution of airflow in the reduction period is obtained by genetic algorithm.