焦炭在H2O+CO2气氛中的溶损反应特性

doi:10.13228/j.boyuan.issn0449-749x.20210775

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Abstract To study the solution-loss reaction characteristics of cokes in hydrogen-rich blast furnace, a homemade coke reactivity measurement device with continuous water inflow was developed to carry out coke solution-loss experiments by CO₂ (N₂) carrying H₂O vapor with different percentages (0-30%), which provided H₂O+CO₂(gas mixture of H₂O and CO₂)and H₂O+N₂(gas mixture of H₂O and N₂)atmosphere. The Boudouard reaction(C+CO₂=2CO)kinetics and water gas (C+H₂O=CO+H₂)reaction kinetics of cokes in H₂O+CO₂ atmosphere were studied using real-time recording the mole percent of CO and H₂ in the outlet gas through infrared gas analyzers. The results show that carbon loss ratio and solution-loss rate of cokes increase with the increase of H₂O percentage in the H₂O+CO₂reaction atmosphere. Furthermore, with the increase of H₂O percentage the water gas reaction rate and carbon loss ratio increase gradually, while the Boudouard reaction rate and carbon loss ratio decrease gradually, which indicates that there is a strong competition between the reactions of H₂O and CO₂ with coke. The analysis for fitting slopes of linear relationship between carbon loss rate and H₂O percentage shows that the slopes of the Boudouard reaction and water gas reaction for cokes in H₂O+CO₂ atmosphere are less than the ones in single atmosphere, and an inhibition factor (α) based on the difference of reaction rate constant is proposed to evaluate the degree of inhibition, which can characterize the influence degree of interaction for H₂O and CO₂ on carbon dissolution reaction and water gas reaction. The inhibition factor α_CO₂/H₂O of CO₂ to water gas reaction is 0.253, and the inhibition factor α_H₂O/CO₂of H₂O to Boudouard reaction is 0.179. α_CO₂/H₂O: α_H₂O/CO₂ is 1.41. The inhibition degree of CO₂ on water gas reaction is stronger than that of H₂O on carbon solution reaction.

Key words： coke solution-loss reaction H₂O+CO₂ atmosphere competition inhibition factor

Received: 17 December 2021

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	Articles by authors
	DOU Ming-hui
	SUN Yang
	HAN Jia-wei
	SUN Zhang
	LIANG Ying-hua

Cite this article:

DOU Ming-hui,SUN Yang,HAN Jia-wei等. Solution loss characteristics of cokes in H₂O+CO₂ atmosphere[J]. Iron and Steel, 2022, 57(7): 26-33.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210775 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I7/26

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