Differential dynamic patterns of CO2, CH4 and N2 deformation by adsorption-desorption in coal bodies

doi:10.16265/j.cnki.issn1003-3033.2025.07.1648

Abstract

Abstract:

In order to study the dynamic law and differential response of coal deformation for different gases in the whole process of adsorption-desorption, the deformation test was carried out under the conditions of adsorption-desorption of CO₂, CH₄ and N₂ in primary coal by utilizing the dynamic test platform for adsorption / desorption deformation of coal bodies. The results show that the adsorption strain of each gas changes with time in Langmuir form, and the coal bodies with the strong adsorption gases exhibit larger deformation and faster response. The body strain of different adsorbed gases in the process of desorption decreases with the increase of desorption amount in a nearly linear manner, and the desorption shrinkage of the strong adsorption gas is more significant, but the residual deformation is also larger, and the residual body strain of CO₂ is twice that of CH₄, and that of CH₄ is almost twice that of N₂. With the same desorption gas amount, the shrinkage deformation caused by CH₄ is the most obvious, and the shrinkage deformation caused by CO₂ and N₂ is about 1/3 of it. In the whole process of adsorption and desorption, the adsorption strain is anisotropic and changing constantly, and the adsorption strain in the direction perpendicular to the bedding is always larger than that parallel to the bedding. The change of anisotropy coefficient of CO₂ is the largest, that of N₂ is the next, and that of CH₄ is the smallest.

Key words: adsorption-desorption, deformation characteristics, anisotropy, desorption amount, residual deformation

CLC Number:

AN Fenghua, DING Yuandong, DING Yanning, WANG Liguo, LIU Jun. Differential dynamic patterns of CO₂, CH₄ and N₂ deformation by adsorption-desorption in coal bodies[J]. China Safety Science Journal, 2025, 35(7): 98-105.

Figures/Tables 9

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气体	吸附过程			解吸过程
	Langmuir			线性函数
	A/10^-3	B/d^-1	R²	C/ d^-1	D/10^-3	R²
CO₂	5.88	1.42	0.99	-0.45	7.11	0.97
CH₄	1.88	0.98	0.94	-0.3	2.8	0.82
N₂	1.85	0.85	0.93	-0.12	1.77	0.86

气体	拟合函数
气体	ε_r/10^-3	η	R²
CO₂	5.51	-6.3	0.92
CH₄	2.63	-17.63	0.90
N₂	1.47	-5.41	0.92

Differential dynamic patterns of CO₂, CH₄ and N₂ deformation by adsorption-desorption in coal bodies

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