Investigation of adsorption characteristics of C2H4 from coal in low-temperature stage

doi:10.16265/j.cnki.issn1003-3033.2024.01.0299

Abstract

Abstract:

In order to study the evolution characteristics of adsorption of C₂H₄by residual coal in closed area of coal mine goaf, taking non-cohesive coal in Lingxin Coal Mine of Ningxia as the research object, the adsorption of C₂H₄ by coal was tested by volumetric method. The effects of temperature, pressure and particle size on the adsorption capacity, adsorption rate and adsorption thermodynamics were analyzed. The results show that when the temperature is 30-60 ℃, the pressure is 0.15-0.45 MPa and the particle size is 20-120 mesh, the adsorption capacity of C₂H₄ increases with the decrease of temperature, the increase of pressure and the decrease of particle size. The adsorption process changes from fast to slow with time, then tends to equilibrium, and the adsorption rate rapidly tends to 0. When the temperature and particle size are constant, the adsorption rate increases with the increase of equilibrium pressure. When the temperature and pressure are constant, the adsorption rate increases with the decrease of particle size. At the same adsorption capacity, the smaller the particle size is, the lower the equilibrium adsorption heat is. The equivalent adsorption heat of C₂H₄ adsorbed by coal samples with different particle sizes is 0.69-40.23 kJ/mol, which belongs to physical adsorption. The pressure correction coefficient is introduced to fit, and the pressure and particle size are proportional to the reduction of adsorption free energy when the temperature is constant. Under the condition of constant particle size, the temperature is inversely proportional to the decrease of adsorption free energy. The adsorption entropy of C₂H₄ for coal samples with different particle sizes is negative, and the adsorption entropy increases with the increase of adsorption capacity and the decrease of temperature. Under the same adsorption capacity, the larger the particle size, the greater the adsorption entropy.

Key words: low temperature stage, C₂H₄, adsorption characteristics, adsorption rate, spontaneous combustion of coal, adsorption heat

CLC Number:

WEN Hu, LI Zhuofeng, ZHANG Duo, TANG Rui, LI Jie. Investigation of adsorption characteristics of C₂H₄ from coal in low-temperature stage[J]. China Safety Science Journal, 2024, 34(1): 94-105.

Figures/Tables 15

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粒径/目	孔容/(mL·g^-1)			总孔容/ (mL·g^-1)	孔容比/%
粒径/目	中孔	过渡孔	微孔	总孔容/ (mL·g^-1)	中孔	过渡孔	微孔
[20,40)	0.002 9	0.005 1	0.004 3	0.012 3	23.44	40.08	38.97
[40,60)	0.003 6	0.005 9	0.006 4	0.015 9	22.64	37.11	40.25
	中孔	过渡孔	微孔		中孔	过渡孔	微孔
[60,80)	0.003 9	0.006 04	0.011 3	0.021 24	18.36	28.44	53.20
[80,100)	0.005 4	0.007 4	0.015 2	0.028	19.29	26.43	54.28
[100,120)	0.006 6	0.008 91	0.020 4	0.035 91	20.05	24.89	55.88

粒径/目	孔比表面积/(m²·g^-1)			总比表面积/ (m²·g^-1)	比表面积比/%
粒径/目	中孔	过渡孔	微孔	总比表面积/ (m²·g^-1)	中孔	过渡孔	微孔
[20,40)	0.09	0.83	1.20	2.12	3.77	28.97	73.82
[40,60)	0.12	0.92	3.23	4.27	2.81	21.55	75.60
[60,80)	0.14	0.95	7.25	8.34	1.68	11.39	86.93
[80,100)	0.17	1.09	10.30	11.56	1.47	9.43	89.10
[100,120)	0.20	1.17	12.56	13.93	1.28	8.55	90.80

粒径/目	吸附平均速率/(mL·g^-1·s^-1)
[20,40)	3.12×10^-4~5.32×10^-4
[40,60)	3.57×10^-4~5.76×10^-4
[60,80)	3.91×10^-4~7.05×10^-4
[80,100)	5.231×10^-4~9.88×10^-4
[100,120)	6.77×10^-4~1.36×10^-3

粒径/目	温度/℃	A	B	拟合优度
[20,40)	30	6.97	5.04	0.96
	40	7.19	5.09	0.96
	50	7.42	5.10	0.96
	60	8.48	5.11	0.95
[40,60)	30	4.24	5.03	0.98
	40	4.50	5.06	0.98
	50	5.49	5.06	0.98
	60	6.13	5.06	0.99
[60,80)	30	2.82	5.04	0.98
	40	3.58	5.07	0.99
	50	3.93	5.06	0.96
	60	4.67	5.08	0.99
[80,100)	30	1.95	5.03	0.99
	40	2.30	5.04	0.99
	50	2.34	5.05	0.99
	60	2.65	5.06	0.99
[100,120)	30	1.39	5.07	0.98
	40	1.51	5.07	0.98
	50	1.58	5.07	0.98
	60	1.67	5.09	0.98

粒径/目	等量吸附热/(kJ·mol^-1)	平均值/(kJ·mol^-1)
[20,40)	4.02~40.23	20.91
[40,60)	3.62~37.92	19.19
[60,80)	3.31~31.83	16.59
[80,100)	1.77~14.25	7.74
[100,120)	0.69~6.20	3.21

Investigation of adsorption characteristics of C₂H₄ from coal in low-temperature stage

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