转炉炼钢工艺极限碳排放研究进展

doi:10.13228/j.boyuan.issn0449-749x.20220666

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Abstract China's steel industry has made great progress,and its annual steel output ranks first in the world for many years. The resulting environmental pressure such as CO₂ emission has become increasingly prominent. It is very important to reduce CO₂ emission in steel industry. The CO₂ emission per ton of steel produced by long process steelmaking is about 3.5 times that produced by short process steelmaking. How to reduce the carbon emission of long process steelmaking is of great significance for the low-carbon development of the steel industry. The ultimate carbon emission technology of converter steelmaking is proposed,the emission reduction capacity and potential of the long process steelmaking from three aspects of "low carbon hot metal","low carbon smelting" and "low carbon raw materials" is studied and analyzed. In terms of low-carbon hot metal production,according to the existing technology that can be realized,the carbon emission of hot metal production can be reduced from 1.7 t/t to 0.8 t/t per ton of hot metal. In terms of low-carbon raw materials,the ultimate carbon emission of raw and auxiliary materials required for production of converter steelmaking process can be reduced from 197.5 kg/t of current carbon emission per ton of steel to 61.7 kg/t. Low carbon smelting technology is adopted in converter steelmaking process,and carbon emission per ton of steel will be significantly reduced. If 20% scrap and 50% scrap are used in converter,the ultimate carbon emission of converter will be reduced to 727 kg/t and 466 kg/t steel. 50% scrap steel is used in converter for smelting,biomass is injected,green electricity and low-carbon raw materials are used,and the carbon emission intensity in the converter process will be reduced from 107 kg/t to -186 kg/t,thus realizing " negative carbon emission steelmaking " in the converter process. Refining,continuous casting and other processes focus on green low-carbon technology,which is expected to achieve "near zero carbon emission" in steel mills. The research on long-process low-carbon steelmaking based on converter has a significant role in promoting the low-carbon development of the whole steel industry,and is a powerful means to promote the green and low-carbon transformation of the steel industry and implement the "double-carbon" goal.

Key words： converter steelmaking ultimate carbon emission low carbon ironmaking low carbon smelting low carbon raw material negative carbon emission steelmaking

Received: 26 October 2022

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	ZHU Rong
	REN Xin
	XUE Bo-tao

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ZHU Rong,REN Xin,XUE Bo-tao. Research progress of ultimate carbon emission in BOF steelmaking process[J]. Iron and Steel, 2023, 58(3): 1-10.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220666 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I3/1

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