高炉使用铁焦的㶲分析

doi:10.13228/j.boyuan.issn0449-749x.20220047

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Abstract China′s iron and steel production is mainly based on the long process of BF-BOF with high energy consumption and high emission, which has great pressure on energy conservation and emission reduction. Therefore, it is particularly important to actively develop blast furnace low-carbon ironmaking technology and promote CO₂ emission reduction in blast furnace process. Iron coke is a new type of carbon-iron composite burden after coking or carbonization by adding iron-containing raw materials into suitable coal. Its high reactivity can significantly reduce the temperature in the heat reserve area and then reduce carbon consumption. Using proper iron coke in blast furnace can realize energy saving and carbon reduction to a certain extent. Based on the field production data, the model of iron coke used in blast furnace was established by the theory of exergy analysis, and the influence of iron coke addition on material consumption and energy utilization efficiency of blast furnace was explored. The results show that after using of iron coke in blast furnace, indirect reduction in blast furnace is developed, carbon utilization rate is improved, ash content in blast furnace is reduced, and carbon consumption per unit pig iron and slag amount are reduced. Compared with no iron coke, carbon consumption per ton iron and slag amount are reduced by 25.95 kg and 11.28 kg respectively after using 114 kg/t iron coke in blast furnace. In addition, the metallic iron in iron coke only needs to be melted, which saves the exergy amount required for reduction, and the exergy amount brought by coke and blast will be significantly reduced, so the total exergy amount consumed per ton of iron in blast furnace smelting will be reduced, at the same time, the heat transfer in the furnace will be improved, and the internal exergy loss will be effectively reduced. Compared with no iron coke, after using 114 kg iron coke in blast furnace, the target exergy efficiency increases from 46.14% to 48.87%, and the thermodynamic perfection increases from 87.46% to 88.02%. Under these conditions, the internal exergy loss per ton of iron in blast furnace is reduced by 192.63 MJ, and energy saving is achieved by 6.57 kg.

Key words： iron coke blast furnace energy conservation and carbon reduction exergy equilibrium model exergy efficiency

Received: 17 January 2022

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	GUO Jun
	CHU Man-sheng
	TANG Jue
	LI Feng
	LIU Zheng-gen
	BAO Ji-wei

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GUO Jun,CHU Man-sheng,TANG Jue等. Exergy analysis of blast furnace using iron coke[J]. Iron and Steel, 2022, 57(8): 30-38.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220047 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I8/30

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