煤体吸附-解吸CO2、CH4、N2变形特征及差异

doi:10.16265/j.cnki.issn1003-3033.2025.07.1648

摘要/Abstract

摘要： 为研究煤对不同气体吸附-解吸全过程中变形动态特征及差异响应,利用煤体吸附-解吸变形动态测试试验平台,开展原生煤吸附-解吸CO₂、CH₄、N₂条件下变形测试。结果表明:各气体吸附应变与时间关系呈Langmuir形式变化,强吸附性气体煤体变形量大、响应快;解吸过程中不同吸附气体的体应变均随着解吸量的增加而近似线性减小,强吸附性气体解吸收缩更显著,但是残余变形也更大,CO₂残余体应变是CH₄的2倍,而CH₄几乎是N₂的2倍;相同解吸量条件下CH₄引起的收缩变形最明显,CO₂和N₂引起收缩变形为其1/3左右;在吸附-解吸全过程中吸附应变表现出各向异性且不断变化,垂直层理方向吸附应变始终大于平行层理方向,CO₂各向异性系数变化最大,N₂次之,CH₄变化最小。

关键词: 吸附-解吸, 变形特征, 各向异性, 解吸量, 残余变形

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

中图分类号:

安丰华, 丁远东, 丁彦宁, 王立国, 刘军. 煤体吸附-解吸CO₂、CH₄、N₂变形特征及差异[J]. 中国安全科学学报, 2025, 35(7): 98-105.

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.

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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

煤体吸附-解吸CO₂、CH₄、N₂变形特征及差异

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

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