Influence of Co-injection of COG and LDG on Blast Furnace Smelting Parameters and Carbon Emission Reduction
摘要
To address the high carbon emissions associated with the blast furnace ironmaking process in the steel industry, this study investigates the influence of coke oven gas (COG) and Linz-Donawitz gas (LDG) co-injection on the smelting process and explores its potential for carbon emission reduction. By establishing a static mathematical model of the blast furnace and analyzes the influence of different mixing ratios and injection volume on smelting parameters. Carbon emission analysis revealed that exclusive LDG injection elevates emissions due to its elevated CO concentration, whereas the gas mixture with high COG proportion achieves a maximum CO2 mitigation rate of 4.99 pct. The results indicate that increasing the proportion of COG effectively enhances the hydrogen reduction reaction while suppressing the direct reduction reaction. The coke rate was reduced by a maximum of 12.4 pct, and the direct reduction degree decreased from 0.4771 to 0.3657, and the theoretical combustion temperature decreased with increasing COG proportion. To stabilize furnace conditions, an optimized mixed injection scheme of coke oven and converter gas is proposed. By clarifying the CO2 reduction mechanisms, this study optimizes fuel consumption and enhances reduction efficiency, providing a theoretical framework for low-carbon gas resource utilization in steel plants.