面向长流程的富氢低碳炼铁技术路径分析

doi:10.13228/j.boyuan.issn0449-749x.20230102

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Abstract The long ironmaking process with blast furnace and basic oxygen furnace (BF→BOF) is the leading process of steel production in China. Under the background of "dual carbon", green and low-carbon development has become the core proposition of the transformation and development for the iron and steel industry. At present, the hydrogen metallurgy low-carbon technology route based on hydrogen instead of carbon is mainly adopted at home and abroad, and the domestic route is mainly oxygen-rich BF and hydrogen-based shaft furnace (SF). It promotes the transformation of traditional BF to hydrogen-rich and oxygen and carbon-recycle (Hy-O-CR) technology. Combined with the mechanism of hydrogen metallurgy and the characteristics of the existing typical low-carbon process route, the upper limit of CO₂ emission reduction of hydrogen metallurgy technology route is analyzed. Starting with limiting the key parameters of CO₂ emission reduction in BF, the author puts forward a new ironmaking system and method of reduction smelting furnace (RSF) with Hy-O-CR. The ironmaking system includes many sets of equipment such as reduction smelting furnace, gas dust collector, dryer, CO₂ separator, electrolytic water device, blower, heat exchanger, storage tank of reduction gas, chimney, and other equipment, in which the reduction melting furnace includes an indirect reduction zone, a soft melting dripping zone, and a coke combustion zone from top to bottom. Ironmaking methods include coke and ore mixed charging, injection of the mixed reduction gas composed by electrolytic green hydrogen and circulating gas from the furnace top gas in the indirect reduction zone, injection of oxygen in the coke combustion zone, CO₂ recovery of the furnace top gas, slag and hot metal treatment. By designing the size of new furnace type and optimizing parameters, the metallization rate of ore in the indirect reduction zone is up to 85%-95%, and the carbon consumption per ton of hot metal is greatly reduced. Based on the theoretical calculation of thermodynamics, the relevant physical experimental data and the analysis of CO₂ emission indexes of six typical processes, the feasibility and popularization prospect of the new process are further expounded. Using the full-oxygen method to recycle the reduction gas produced by its own reactor, the process achieves the goal of reducing CO₂emissions by more than 50%, and realizes green and low-carbon metallurgy.

Key words： long process hydrogen metallurgy oxygen low-carbon reduction smelting furnace

Received: 06 March 2023

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	Articles by authors
	LI Haifeng
	CHEN Jingran
	WANG Xindong
	ZHANG Caidong
	ZHENG Aijun
	WANG Xiaoai

Cite this article:

LI Haifeng,CHEN Jingran,WANG Xindong等. Technical pathway analysis for low-carbon ironmaking with hydrogen-rich towards long-process[J]. Iron and Steel, 2023, 58(10): 1-11.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230102 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I10/1

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