A Mathematical Model of COREX Process with Top Gas Recycling

Abstract

A mathematical model of the COREX process with a top gas recycling technology is developed based on mass and heat balances. Herein, the influence of top gas recycling on the operation parameters of the COREX process is investigated. The results show that the theoretical combustion temperature is significantly affected by gas injection, and the theoretical combustion temperature can be reduced by 116.11 and 72.94 °C, respectively, by injecting the gas without CO2 removal and the gas after CO2 removal. Also, injecting the gas without CO2 removal obviously reduces the dome temperature, but injecting the gas after CO2 removal has no obvious effect on the dome temperature. The fuel rate and integrated fuel rate can be reduced by injecting the two kinds of gas, and the fuel rate can be reduced by 2.84 and 2.86 kg t−1, respectively, by injecting the gas without CO2 removal and the gas after CO2 removal, but the decrease in the integrated fuel rate by injecting the gas after CO2 removal is relatively small, only 0.31 kg t−1.

Numerical Analysis of Blast Furnace with Injection of COREX Export Gas After Removal of CO₂

“…For example, Zhang J. L. et al used a mathematical model to study the optimum process parameters of two kinds of nitrogen free blast furnaces (NF-BF) which use different methods to inject recycling top gas. 28 32) These works, especially the static model method, provide an effective reference for the theoretical exploration of CEG injection in BF. However, as the CEG injection in BF is not operation with full oxygen or high oxygen enriched supply, 33,34) the phenomenon in BF with CEG injection are different from that in oxygen BF with top gas recycling, and the informa-tion about the CEG injection in BF are rare.…”

Influence of Parameters on the Pre-Reduction Process of Vanadium-Titanium Magnetite Carbon-Containing Composite Pellets in Rotary Kiln

“…The COREX method, as the first smelting reduction process for industrial production, has been successfully applied in India, South Korea, South Africa, and China [8]. Although COREX is considered as the most advanced iron-making process, it is still involved in some technical problems [9].…”