Study on effect of temperature on gas flow and coal deformation in whole process

doi:10.16265/j.cnki.issn1003-3033.2023.08.2537

Abstract

Abstract:

In order to reveal the difference of coal deformation in the whole process of adsorption-desorption-seepage under different temperatures, the self-developed coal-gas fluid-solid coupling experimental system was used to carry out the experiment on the response characteristics of gas adsorption-desorption-seepage and coal deformation in the whole process with various temperature under triaxial stress. The experimental results show that the gas adsorption, permeability and coal deformation in the process all decrease with increasing temperature, and the gas desorption rate increases with increasing temperature. Coal deformation is positively correlated with gas adsorption, desorption and permeability. During the gas adsorption stage, the coal deformation shows a Langmuir-type upward change with adsorption time. In the gas desorption stage, the coal deformation shows an exponential decay trend. And in the gas seepage stage, the coal deformation shows an upward trend of a power function. The temperature effect has a significant influence on the coal deformation in the whole process.

Key words: gas flow, whole process of adsorption-desorption-seepage, coal deformation, permeability, temperature effect

LIN Haifei, CHEN Chen, LONG Hang, SHUANG Haiqing, JI Pengfei, LUO Rongwei. Study on effect of temperature on gas flow and coal deformation in whole process[J]. China Safety Science Journal, 2023, 33(8): 59-67.

Figures/Tables 13

Tab.1

Fig.1

Fig.2

Fig.3

Tab.2

Fig.4

Tab.3

Fitting results of whole process deformation of coal

温度/K			303	313	323	333	343
吸附阶段	径向变形	$η x 1$ /10^-2mm	1.65	1.45	1.45	0.99	0.77
		$ζ x 1$ /10^-3s^-1	0.34	0.31	0.27	0.24	0.23
		拟合度	0.99	0.98	0.98	0.99	0.9
	轴向变形	$η x 2$ /10^-2mm	1.05	1.09	1.12	1.14	1.25
		$ζ x 2$ /10^-3s^-1	0.15	0.14	0.12	0.11	0.09
		拟合度	0.99	0.99	0.99	0.99	0.99
解吸阶段	径向变形	$ε j 0 - 1$ /10^-2mm	0.07	0.06	0.04	0.03	0.03
		$α j 1$ /10^-2mm	0.26	0.24	0.22	0.2	0.18
		$β j 1$ /10³s	32.09	32.08	32.05	32.04	32.02
		$γ j 1$ /10³s	3.69	3.66	3.61	3.57	3.52
		拟合度	0.98	0.98	0.99	0.99	0.99
	轴向变形	$ε j 0 - 2$ /10^-2mm	0.01	0.01	0.01	0.01	0.02
		$α j 2$ /10^-2mm	0.14	0.12	0.1	0.08	0.06
		$β j 2$ /10³s	31.95	31.95	31.95	31.95	31.95
		$γ j 2$ /10³s	2.03	2.03	2.03	2.03	2.03
		拟合度	0.99	0.99	0.99	0.99	0.99
渗流阶段	径向变形	ε'₁/10^-2mm	0.29	0.25	0.22	0.17	0.14
		$γ s 1$ /10³s	50.55	50.55	50.56	50.58	50.48
		n₁	53.52	53.38	53.63	54.25	51.72
		拟合度	0.99	0.99	0.99	0.99	0.99
	轴向变形	ε'₂/10^-2mm	0.09	0.09	0.07	0.07	0.06
		$γ s 2$ /10³s	50.96	50.92	50.84	50.7	50.15
		n₂	73.6	70.56	65	58.19	45.73
		拟合度	0.98	0.98	0.98	0.99	0.99

Tab.3

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

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煤样编号	直径/mm	高度/mm	质量/g	波速/(km·s^-1)
1	49.95	100.10	240.12	1.25
2	50.12	100.93	240.38	1.20
3	50.08	100.95	240.25	1.21
4	50.10	100.09	240.16	1.24
5	50.14	100.02	239.86	1.28
6	50.02	100.10	240.39	1.18
7	50.19	100.08	241.20	1.20
8	49.92	100.02	240.61	1.25
9	49.90	99.93	240.18	1.22
10	50.10	99.95	240.36	1.18
11	50.06	99.98	240.15	1.17
12	50.04	99.96	240.26	1.15
13	49.96	100.08	240.25	1.20
14	50.01	100.10	241.02	1.23
15	50.05	100.06	240.96	1.25

温度/K		303	313	323	333	343
吸附阶段	a_x/ (mL·g^-1)	0.89	0.92	1.01	0.89	0.69
	b_x/10^-3s^-1	3.43	3.05	2.63	2.41	2.27
	拟合度	0.99	0.99	0.99	0.99	0.99
解吸阶段	a_j/ (mL·g^-1)	0.47	0.47	0.47	0.46	0.46
	b_j/10^-3s^-1	3.08	2.81	2.48	2.28	2.15
	拟合度	0.99	0.99	0.99	0.99	0.99
渗流阶段	a_s/ (mL·min^-1)	2.56	2.56	2.56	2.56	2.57
	b_s/10^-3s^-1	20.54	15.93	13.95	10.94	10.21
	拟合度	0.99	0.99	0.99	0.99	0.99