Industrialized application of hydrogen-rich gas injection into blast furnace of Jinnan Steel

GAO Jian-jun; ZHU Li; KE Jun-chao; HUO Xu-feng; QI Yuan-hong

doi:10.13228/j.boyuan.issn0449-749x.20220075

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Iron and Steel ›› 2022, Vol. 57 ›› Issue (9) : 42-48. DOI: 10.13228/j.boyuan.issn0449-749x.20220075

Raw Material and Ironmaking

Industrialized application of hydrogen-rich gas injection into blast furnace of Jinnan Steel

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Abstract

Iron and steel industry is one of the largest industrial carbon dioxide producers in China, accounting for about 15% of the total carbon dioxide emission. Blast furnace is the dominate carbon consumer, accounting for more than 70% of the total carbon consumption in the iron and steel making process. Lowering the carbon consumption of blast furnace is the most effective measure to reduce the carbon dioxide emission of iron and steel industry. Injecting hydrogen-rich gas into blast furnace can not only improve productivity and reduce pollutant emission, but also decrease coke or pulverized coal consumption, resulting in less carbon consumption in blast furnace at its source and less carbon dioxide emissions. Taking the industrial test data of hydrogen-rich gas injection into two 1 860 m³ blast furnaces of Shanxi Jinnan Steel Group as an example, the effects of hydrogen-rich gas injection into blast furnaces on fuel ratio, theoretical tuyere combustion temperature, bosh gas volume, H₂ utilization rate and CO₂ emission were studied. The results show that injecting hydrogen-rich gas can significantly reduce the consumption of solid fuel in blast furnace. When the injection volume of hydrogen-rich gas per ton of hot metal is 65 m³, the replacement ratio of hydrogen-rich gas to solid fuel is 0.49 kg/m³. The injection of hydrogen-rich gas into the tuyere lowers the theoretical tuyere combustion temperature by about 1.5 ℃ for each injection of 1 m³ hydrogen rich gas, and the blast volume and bosh gas volume of blast furnace decrease slightly. After injecting hydrogen-rich gas, the average utilization rate of H₂is 37.3%, the average utilization rate of CO is 43.2%. When the injection volume of hydrogen-rich gas per ton of produced hot metal is 65 m³, CO₂ emission per ton of produced hot metal can be reduced by about 80 kg, and CO₂ emission of blast furnace can be decreased by 5.6%, achieving good economic, environmental and carbon reduction results.

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blast furnace / hydrogen-rich gas / replacement ratio / H₂ utilization rate / CO₂ emission

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GAO Jian-jun, ZHU Li, KE Jun-chao, et al. Industrialized application of hydrogen-rich gas injection into blast furnace of Jinnan Steel[J]. Iron and Steel, 2022, 57(9): 42-48 https://doi.org/10.13228/j.boyuan.issn0449-749x.20220075

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