关于天然气重整制备富氢还原气体过程中析碳问题的调控——H-C-O体系质量及化学平衡衡算图的应用例

doi:10.13228/j.boyuan.issn0449-749x.20220750

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Abstract If the operating parameters in the process of preparing hydrogen-rich reducing gas are not properly controlled, the problem of carbon deposition will occur, which will affect the stability of the process of preparing hydrogen-rich reducing gas by using natural gas or coke oven gas as the gas source. Therefore, it is necessary to investigate and control the problem of carbon deposition in the process of preparing hydrogen-rich reducing gas that meets the requirements of the direct reduction iron process. The problem of "carbon deposition" in the process of preparing hydrogen-rich reducing gas from natural gas reforming or coke oven gas reforming process was discussed by using the "H-C-O system mass and chemical balance diagram" and the principle of chemical equilibrium. Assuming that the natural gas reforming or coke oven gas reforming system is at the critical state of carbon deposition, the relationships between the carbon deposition curve and the factors of n_H₂/n_CO of the reduction gas, reforming temperature, and total system pressure were determined, the critical carbon deposition curve in the process of reforming natural gas or coke oven gas to hydrogen-rich reducing gas was given from the perspective of thermodynamics, the "carbon deposition region" and "non-carbon deposition region" were obtained, and the process parameters, such as the reforming temperature of hydrogen-rich reducing gas and the total system pressure, which can inhibit the carbon deposition and meet the required n_H₂/n_CO of direct reduction iron, were given. The results show that in order to ensure n_H₂/n_CO and the total amount of the effective composition of φ(H₂)+φ(CO)simultaneously meet the requirements for the composition of the direct reduction gas, the reforming temperature must be higher than 800 ℃ under P_tot=0.1 MPa; The conversion of CH₄ decreased with the increase of total system pressure; For low n_H₂/n_CO (=2), the carbon deposition region will increase with the increase of the total system pressure and for n_H₂/n_CO (=5), with the increase of the total pressure of the system, the carbon deposition region becomes smaller, which is because the gasification reaction of carbon is the mainstream reaction when n_H₂/n_CO is low and increasing the total system pressure will enhance the carbon deposition; However, when n_H₂/n_CO is high, the methane decomposition reaction is the mainstream reaction, and increasing pressure rise will hinder the methane decomposition and inhibit the carbon deposition. In addition, if the total system pressure is too high, it will not be able to obtain the reducing gas with the effective composition of φ(H₂)+φ(CO) to meet the requirements of the direct reduction iron process.

Key words： hydrogen-rich direct reduction iron hydrogen-rich reducing gas natural gas reforming or coke oven gas reforming H-C-O system mass balance and chemical equilibrium diagram control of carbon deposition thermodynamic analysis

Received: 06 December 2022

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	SHEN Fengman
	ZHANG Weiling
	ZHENG Aijun
	ZHENG Haiyan
	DING Zhimin
	LI Ji

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SHEN Fengman,ZHANG Weiling,ZHENG Aijun等. Regulation of carbon deposition during preparation process of hydrogen-rich reducing gas by natural gas reforming ——An application example of H-C-O system mass balance and chemical equilibrium diagram[J]. Iron and Steel, 2023, 58(7): 9-16.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220750 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I7/9

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