低温低压下煤微孔吸附特性研究

doi:10.16265/j.cnki.issn1003-3033.2018.12.013

中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (12): 77-82.doi: 10.16265/j.cnki.issn1003-3033.2018.12.013

低温低压下煤微孔吸附特性研究

洪林^1,2 副教授, 高大猛^**1,2, 王继仁^1,2 教授, 郑丹^1,2 副教授, 杜元红^1,2

1 辽宁工程技术大学安全科学与工程学院,辽宁阜新 123000
2 矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛 125105

收稿日期:2018-08-10 修回日期:2018-10-14 发布日期:2020-11-25
通讯作者: ** 高大猛(1991—),男,河北青龙人,博士研究生,研究方向为煤矿瓦斯防治。E-mail:lgdaqxy123000@126.com。
作者简介:洪林 (1976—),男,重庆人,博士,副教授,主要从事煤矿瓦斯灾害防治研究及教学工作。E-mail:honglyn@163.com。
基金资助:
国家自然科学基金资助(51004062);辽宁省自然科学基金资助(2015020625);辽宁省教育厅项目(LJ2017FBL001)。

Adsorption characteristics of micropores in coal at low temperature and pressure

HONG Lin^1,2, GAO Dameng^1,2, WANG Jiren^1,2, ZHENG Dan^1,2, DU Yuanhong^1,2

1 College of Safety Science & Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China
2 Key Laboratory of Mine Thermodynamic Disaster & Control of Ministry of Education, Huludao Liaoning 125105, China

Received:2018-08-10 Revised:2018-10-14 Published:2020-11-25

摘要/Abstract

摘要： 为探究煤及瓦斯突出的动力来源与煤微孔吸附的关系,利用物理化学吸附仪,开展煤样低温氮吸附试验;采用非线性拟合方法分析试验数据,根据微孔填充和多分子层吸附理论,分析煤的微孔填充与介孔表面吸附的分界点;利用杜比宁-拉杜什科维奇(D-R)方程和理想气体状态方程,计算煤的微孔填充率、气体在解吸过程中的压力。结果表明:煤中微孔填充现象和多分子层吸附的分界点是相对压力为0.01;煤的微孔内有超过48%的体积被气体填充,这些气体在解吸过程中产生的压力在30.38 MPa以上,这一压力作用于煤体,会导致煤体破碎,诱发大量气体释放,为煤与瓦斯突出提供动力来源。

关键词: 煤, 氮吸附试验, 微孔填充, 多分子层吸附理论, 吸附等温线, 解吸压力

Abstract: To explore the relationship between the power source of coal and gas outburst and coal microporous adsorption, coal samples low-temperature nitrogen adsorption experiments were carried out by means of a physicochemical adsorber. Based on the theory of micropore filling and multi-layer adsorption, the demarcation point between micropore filling and adsorption on mesoporous surface of coal was analyzed by using the non-linear fitting method. The micropore filling rate of coal and the pressure of gas in the process of desorption were calculated with the aid of the Dubinin-Radushvich (D-R) equation and the ideal gas equation of state. The results show that the demarcation point between micropore filling and multi-layer adsorption of coal is the relative pressure of 0.01, that more than 48% of the microporous volume is filled with gas (methane), that the pressure generated by the gas during desorption is over 30.38 MPa, which will lead to the fragmentation of the coal, induce a release of a large amount of gas, and provide a power source for coal and gas outburst.

Key words: coal, nitrogen adsorption experiment, micropore filling, multi-layer adsorption, adsorption isotherm, desorption pressure

中图分类号:

X936

洪林, 高大猛, 王继仁, 郑丹, 杜元红. 低温低压下煤微孔吸附特性研究[J]. 中国安全科学学报, 2018, 28(12): 77-82.

HONG Lin, GAO Dameng, WANG Jiren, ZHENG Dan, DU Yuanhong. Adsorption characteristics of micropores in coal at low temperature and pressure[J]. China Safety Science Journal, 2018, 28(12): 77-82.

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低温低压下煤微孔吸附特性研究

Adsorption characteristics of micropores in coal at low temperature and pressure

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