Determination of phase equilibrium and calculation of dissociation heat of mine gas hydrate in coal-bearing system

被引：0

作者：

Wu Q. ^{[1
,2
]}

Han H. ^{[1
,2
]}

Liu C. ^{[1
,2
]}

Chen R. ^{[1
,2
]}

Zhang B. ^{[1
,2
]}

Zhao Z. ^{[1
,2
]}

Wang W. ^{[1
,2
]}

机构：

[1] Department of Safety Engineering, Heilongjiang University of Science & Technology, Heilongjiang, Harbin

[2] National Central Laboratory of Basic Research of Hydrocarbon Gas Transportation Pipeline Safety, Heilongjiang, Harbin

来源：

Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2023年 / 52卷 / 06期

关键词：

coal and gas outburst; dissociation heat; mine gas hydrate; phase equilibrium; porous medium;

D O I：

10.13247/j.cnki.jcumt.20230343

中图分类号：

学科分类号：

摘要：

With the increase of coal mining depth, coal and gas outburst accidents occur frequently, and it is necessary for national coal energy strategy to take effective measures to prevent coal and gas outburst disasters. Mine gas hydrate phase equilibrium value and dissociation heat value in coal media are important parameters for coal and gas outburst prevention based on hydrate method. The phase equilibrium conditions of CH4 hydrate and CO2 hydrate in four types of particle size coal media (C1:0. 425-0. 850 mm, C2:0. 250~<0. 425 mm, C3:0. 180-<0. 250 mm, C4:0. 150~<0. 180 mm) were studied by using mine gas hydrate phase equilibrium experimental apparatus, and the phase equilibrium parameters curves of CH(hydrate and CO2 hydrate in four types of particle size coal media were obtained, which were compared with the theoretical predicted values of Chcn-Guo model, and the dissociation heat of CH4 hydrate and CO2 hydrate in four types of particle size coal media were calculated based on the Clausius-Clapeyron equation. The results show that a critical value of phase equilibrium conditions for mine gas hydrate in the four particle size coal media, below which the phase equilibrium thermodynamic conditions tend to be milder as the particle size decreases, and above which the phase equilibrium thermodynamic conditions become more severe as the particle size decreases. The average dissociation heat required for the complete decomposition of CH, hydrate gradually increases as the particle size of coal media decreases. Except for CI particle size, the average dissociation heat required for complete decomposition of CO2 hydrate gradually increases with decreasing particle size of coal media, and the average dissociation heat of CO2 hydrate is smaller than that of CH, hydrate, and the stability of CH4 hydrate in coal media is higher than that of CO2 hydrate. The analysis suggests that the use of hydration curing mechanism to prevent coal and gas outburst is more effective in coal seams rich in CH, !. © 2023 China University of Mining and Technology. All rights reserved.

引用

页码：1108 / 1118

页数：10

共 33 条

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