Analysis of carbon reduction strategy based on hydrogen-rich or carbon-containing gas used for smelting reductant
XIAO Xue-wen1, WANG Gang1,2, LI Mu-ming1, ZOU Zhong-ping1, ZHAO Yun-jian1
1. CISDI Engineering Co., Ltd., Chongqing 401122, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract:There is a large amount of hydrogen-rich/carbon-containing gas resources in iron and steel plants, which are mainly used for combustion heating or power generation at present. However, the gas is used for combustion, only using its heat energy (including chemical heat and material heat), but not playing its chemical reduction function, and the energy conversion efficiency is not high. In order to utilize hydrogen-rich/carbon-containing gas rationally in iron and steel plants to reduce carbon emissions, carbon reduction strategy based on hydrogen-rich/carbon-containing gas used for smelting reductant was analyzed. The results show that hydrogen-rich/carbon-containing gas in iron and steel plants is good reductant resource, and it is technically feasible for blast furnace injection hydrogen-rich/carbon-containing gas to achieve carbon reduction. Therefore, the hydrogen-rich/carbon-containing gas can be used for blast furnace 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 blast furnace can replace the coke and pulverized coal, and directly reduce carbon by 10%-20% in the blast furnace ironmaking process. When the price of pulverized coal is higher than 1 200 yuan/t, the price of coke is higher than 3 000 yuan/t, and the proportion of gas replacing coke is higher than 20%, the economic benefit of gas used for blast furnace injection is better than that of 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.
肖学文, 王刚, 李牧明, 邹忠平, 赵运建. 基于富氢/含碳煤气用于冶炼还原剂的减碳策略分析[J]. 中国冶金, 2023, 33(5): 121-127.
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