低温阶段煤吸附C2H4的吸附特性研究

doi:10.16265/j.cnki.issn1003-3033.2024.01.0299

摘要/Abstract

摘要：

为研究煤矿采空区封闭区遗煤吸附C₂H₄的演化特征,以宁夏灵新煤矿不粘煤为研究对象,采用容量法进行煤吸附C₂H₄试验,分析温压与粒径对煤吸附C₂H₄过程中的吸附量、吸附速率和吸附热力学等特征变化的影响。研究表明:当温度为30~60 ℃、压力为0.15~0.45 MPa、粒径为 20~120 目时,无论是温度降低、压力升高还是粒径减小,C₂H₄的吸附量均增加;吸附过程随时间由快变慢,进而趋于平衡,吸附速率快速趋于0;温度与粒径不变,平衡压力越大吸附速率越大;温度与压力不变,粒径越小吸附速率越快。吸附量相同,粒径越小等量吸附热越低;各粒径煤样吸附C₂H₄的等量吸附热为0.69~40.23 kJ/mol,属于物理吸附。引入压力修正系数进行拟合,温度不变,压力和粒径与吸附自由能降低值呈正比关系;粒径不变,温度与吸附自由能降低值呈反比关系。各粒径煤样吸附C₂H₄的吸附熵均为负值,吸附量增大,温度降低,吸附熵值均增大;吸附量相同条件下,粒径越大,吸附熵值越大。

关键词: 低温阶段, C₂H₄, 吸附特性, 吸附速率, 煤自燃, 吸附热

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

中图分类号:

文虎, 李倬锋, 张铎, 唐瑞, 黎杰. 低温阶段煤吸附C₂H₄的吸附特性研究[J]. 中国安全科学学报, 2024, 34(1): 94-105.

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.

图/表 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

低温阶段煤吸附C₂H₄的吸附特性研究

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

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