Fuel consumption in the COREX-3000 process run in Baosteel is currently higher than the design index. Therefore,mass and heat balance equations for the COREX process were established using the basic principles in-cluded in the Rist operating diagram for blast furnace (BF)as a reference.Thermodynamic calculations were then used to modify the Rist operating diagram so that it was suitable for the COREX process.The modified Rist operating dia-gram was then applied for the evaluation of metallization rate (MR)and fuel structure to reduce the energy consump-tion in the COREX process.The modified Rist operating diagram for the shaft furnace (SF)provided a nearly ideal value for the restriction point W when the metallization rate was increased,while the point P on the operating line for the melter gasifier (MG)moved upward due to reduction in the heat required in hearth.The feasibility of reduc-ing the energy consumption during the COREX process by changing the fuel structure was also demonstrated.
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