Analysis of carbon reduction strategy based on hydrogen-rich carbon-containing gas used in smelting reductant

Iron and steel plants have a large amount of hydrogen-rich carbon-containing gas resources. At present, it is mainly used for combustion heating or power generation. However, gas is used for combustion, only using its heat energy (including chemical heat and material heat), but not its chemical reduction function, and the energy conversion efficiency is not high. In order to rationally utilize hydrogen-rich carbon-containing gas in iron and steel plants to reduce carbon emissions. This paper analyzes the carbon reduction strategy based on hydrogen-rich carbon-containing gas used for smelting reductant. The results show that, hydrogen-rich carbon-containing gas from steel plants is a good resource of reducing agent, and it is technically feasible for blast furnace (BF) injection hydrogen-rich carbon-containing gas to achieve carbon reduction. Therefore, the hydrogen-rich carbon-containing gas can be used for BF smelting after purification, pressurization, decarburization, heating and other processes. The reduction function of gas can be fully utilized, and the energy consumption and carbon emission of the whole process are lower than that of gas used for combustion power generation. The gas injected into the BF can replace the coke and pulverized coal, and directly reduce carbon by 10%-20% in the BF ironmaking process. When the price of pulverized coal is higher than 1200 yuan/t, the price of coke is higher than 3000 yuan/t, and the proportion of coal gas replacing coke is higher than 20%, the economic benefit of coal gas used for BF injection is better than that of coal gas used for power generation. The larger the replacement coke ratio, the higher the pulverized coal price, the lower the electricity price, and the better the benefit.