Comparative study on the isosteric enthalpy of desorption with different rank of normal coal and deformed coal

doi:10.16085/j.issn.1000-6613.2020-0986

Abstract

Abstract:

Different coal rank has different controlling effect on gas. According to the temperature-pressure-adsorption equation, the series of isotherm adsorption data of both normal coal and deformed coal with high-rank from Daning Coal Mine of Qinshui Basin and middle-rank from Pingdingshan Minmetals have been effectively converted. The isosteric enthalpy of adsorption of these coals are calculated. The adsorption isotherms of these coals are the system exothermic to the environment, and the more exothermic the system is, the more stable the system is. While the desorption is that the system endothermic from the environment, and the less endothermic the system is, the more stable the system is. When the adsorption capacity is 15.0cm³/g, the exothermic heat of the unit isosteric enthalpy of adsorption is 1.95kJ/(mol·cm³·g) for high-rank normal coal, which is higher than the other three kinds of coal. Therefore, it must be the first to be adsorbed. When the adsorption capacity is 15.0cm³/g, the endothermic heat of the unit isosteric enthalpy of desorption is 0.52kJ/(mol·cm³·g) for middle-rank deformed coal, which is lower than that of the other three kinds of coal. Therefore, it must be the first to be desorbed. It is suggested to measure the endothermic heat of the unit isosteric enthalpy of desorption for different kinds of deformed coal (broken coal, slice coal, freckled coal, mylonitized coal, etc.), which can provide thermodynamic reference for the study of coal and gas outburst.

Key words: normal coal, deformed coal, coal rank, unit isosteric enthalpy of desorption, coal and gas outburst

摘要：

煤阶不同，对瓦斯的控制作用亦不同。本文根据温度-压力-吸附方程将沁水盆地大宁煤矿的高阶原生煤、构造煤与平顶山五矿的中阶构造煤、原生煤这4种煤的系列等温吸附数据进行有效地转换，并由所得的温度-压力-吸附方程计算这些煤的吸附等量线。高中阶原生煤与构造煤的吸附等量线都证实：吸附是系统向环境放热，放热越多，则系统越稳定；解吸是系统从环境吸热，吸热越少，则系统越稳定。在吸附量都为15.0cm³/g时，高阶原生煤单位等量吸附所放的热为1.95kJ/(mol·cm³·g)，均高于其他3种煤，其必然最先吸附。在吸附量都为15.0cm³/g时，中阶构造煤单位等量解吸所吸的热为0.52kJ/(mol·cm³·g)，均低于其他3种煤，其必然最先解吸。建议将不同构造煤（碎裂煤、片状煤、碎斑煤、糜棱煤等）按照单位等量解吸所吸热量的大小进行解吸排序，可为煤及瓦斯突出研究提供热力学参考。

关键词: 原生煤, 构造煤, 煤阶, 单位等量解吸焓, 煤及瓦斯突出

CLC Number:

TD712

Xuemei ZHANG, Qinghua MA, Jingyuan HAO, Dong LI. Comparative study on the isosteric enthalpy of desorption with different rank of normal coal and deformed coal[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 128-134.

张学梅, 马青华, 郝静远, 李东. 不同煤阶的原生煤、构造煤等量解吸焓的比较[J]. 化工进展, 2020, 39(S2): 128-134.

Figures/Tables 11

煤的等级	煤的种类	水分/%	灰分/%	挥发分/%	坚固性系数
高阶无烟煤	原生煤	1.46	18.14	12.29	2.00
	构造煤	1.95	22.15	11.01	0.33
中阶肥煤	原生煤	1.43	4.45	29.53
	构造煤	1.80	5.50	27.51

煤的等级	煤的种类	20℃		30℃		40℃
煤的等级	煤的种类	a	b	a	b	a	b
高阶无烟煤	原生煤			51.89	1.38	49.14	1.20
	构造煤			50.77	1.10	48.51	0.98
中阶肥煤	原生煤	17.24	0.30	16.95	0.26	14.93	0.25
	构造煤	18.76	0.39	16.13	0.51	15.63	0.53

煤的等级	煤的种类	A	B	β	Δ	$δ ˉ$
高阶无烟煤	原生煤	0.168	0.013	0.205	1 043.0	3.320
	构造煤	0.168	0.016	0.240	959.0	3.700
中阶肥煤	原生煤	0.168	0.000 711	0.523	1 293.0	5.140
	构造煤	0.168	0.007 93	0.396 3	695.0	5.000

煤的等级	煤的种类	A	B	β	Δ	$δ ˉ$
高阶无烟煤	原生煤	0.168	0.013	0.205	1 043.0	3.320
	构造煤	0.168	0.016	0.240	959.0	3.700
中阶肥煤	原生煤	0.168	0.000 711	0.523	1 293.0	5.140
	构造煤	0.168	0.007 93	0.396 3	695.0	5.000

煤的种类	T₁/K	p₁/MPa	T₂/K	p₂/MPa
高阶原生煤	303	0.03	333	0.09
高阶构造煤	303	0.07	333	0.15
中阶原生煤	303	13.52	333	23.54
中阶构造煤	303	10.29	333	13.66

煤的种类	单位等量吸附焓/kJ·mol^-1·cm^-3·g^-1
高阶原生煤	-1.95，最先吸附
高阶构造煤	-1.47，↓
中阶原生煤	-1.03，↓
中阶构造煤	-0.52，最后吸附

煤的种类	单位等量解吸焓/kJ·mol^-1·cm^-3·g^-1
中阶构造煤	0.52，最先解吸
中阶原生煤	1.03，↓
高阶构造煤	1.47，↓
高阶原生煤	1.95，最后解吸

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