关于直接还原铁工艺及还原气制备的若干思考

doi:10.13228/j.boyuan.issn0449-749x.20210525

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Abstract Optimizing and improving the preparation process of hydrogen based direct reduction iron is one of the effective ways to develop and implement carbon emission reduction in China. Therefore, hydrogen-based direct reduction iron process will have great development with the promotion of “carbon emission reduction” and “carbon neutralization”. This paper discussed and analyzed the difficult problems in the process of hydrogen-based gas direct reduction of iron from three aspects: iron containing raw materials, reduction gas preparation parameter selection and energy guarantee. Especially for the selection of reduction gas preparation parameters, an innovative graphical method for determining the process parameters of hydrogen-based reduction gas was proposed. This method was used to construct the "mass and chemical balance diagram of H-C-O system" and unify the expression of reducing gas by n_H/n_C and n_O/n_C. Through the introducing of ray nH₂O/nCH₄ scale passing through CO₂ point, the nCO₂/nCH₄ scale parallel to line L₁ (nH₂O+nCH₄>0、nCO₂=0), and the straight line family of nH₂/nCO isolines at different temperatures, and using " mass and chemical equilibrium diagram of H-C-O system", the existence domain of any composition gas could be clearly expressed, that means, the n_H/n_C and n_O/n_C of any composition gas could be clearly expressed. Using this method, the addition amount of nH₂O or nCO₂ or for 1 mol CH₄ under a given nH₂/nCO can be determined. For the process of preparing hydrogen-based reducing gas by reforming natural gas or coke oven gas, the process operating parameters (such as, addition amount and ratio) for preparing hydrogen-based reducing gas with a given nH₂/nCO at a specified temperature can be easily determined by graphical method according to the gas source conditions, so as to provide a theoretical guiding basis for the selection of process parameters for preparing hydrogen-based reducing gas.

Key words： hydrogen-based direct reduction hydrogen-based reduction gas H-C-O system mass and chemical equilibrium diagram reforming of natural gas and coke oven gas

Received: 01 September 2021

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	Articles by authors
	SHEN Feng-man
	ZHENG Ai-jun
	ZHENG Hai-yan
	WANG Xiao-ai
	LI Yang
	ZHANG Wei-ling

Cite this article:

SHEN Feng-man,ZHENG Ai-jun,ZHENG Hai-yan等. Thoughts on preparation of hydrogen-based reduction gas and process of direct reduction iron[J]. Iron and Steel, 2022, 57(3): 10-15.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210525 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I3/10

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