CO<sub>2</sub>-H<sub>2</sub>O混合气体与捣固焦和顶装焦深度反应影响

doi:10.13228/j.boyuan.issn0449-749x.20220005

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Abstract With global warming in recent years, CO₂ emission reduction has gradually become a hot spot of concern. The iron and steel industry, as a large CO₂ emission producer, needs to strictly control its CO₂ emissions. Hydrogen-rich ironmaking has become the future development trend of metallurgical processes due to the characteristics of reducing carbon emissions. However, the use of hydrogen-rich fuels will generate a large amount of water vapor in the blast furnace. Therefore, it is very important to study the changes of different types of coke and CO₂-H₂O mixed gas in the gasification and dissolution loss reaction, which can provide a theoretical basis for the selection and quality control of coke under the condition of hydrogen-rich smelting in blast furnace. By studying the deep gasification and dissolution reaction of tamping coke and top charging coke when gases with different CO₂-H₂O contents enter the tubular furnace, the difference of dissolution loss in gasification reaction caused by the change of water vapor content in CO₂-H₂O mixed gas was analyzed, the change law of coke organic functional groups and carbon structure was studied, and the restrictive links in the reaction process was analyzed by unreacted nuclear model. The research shows that the limiting link of the two kinds of coke gasification reaction is the interface chemical reaction. By comparing the differences of edge, middle, central gap structure and relative density in the gasification dissolution process for tamping coke and top charging coke particles, it is found that with the increase of water vapor content in CO₂-H₂O mixture gas, the surface dissolution reaction of two kinds of coke is more serious than the other two parts and there is obvious opening phenomenon. The internal cracking of tamping coke is more serious. Combined with FT-IR analysis, water vapor can aggravate the consumption of aliphatic functional groups and methyl groups in the structure of top charging coke and tamping coke during gasification reaction, resulting in the increase of aromaticity of the two kinds of coke. At the same time, the condensation degree of aromatic hydrocarbons in tamping coke samples increases after reaction.

Key words： coke CO₂-H₂O depth reaction pore structure limiting link

Received: 04 January 2022

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	Articles by authors
	FU Xiao-wei
	LU Ming
	HE Zhi-jun
	PANG Qing-hai
	YANG Li-chun

Cite this article:

FU Xiao-wei,LU Ming,HE Zhi-jun等. Effect of CO₂-H₂O mixed gas on depth reaction of tamping coke and top charging coke[J]. Iron and Steel, 2022, 57(8): 39-49.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220005 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I8/39

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