高温高压氛围下煤体吸附瓦斯特性研究

doi:10.16265/j.cnki.issn1003-3033.2024.02.1453

中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (2): 176-184.doi: 10.16265/j.cnki.issn1003-3033.2024.02.1453

高温高压氛围下煤体吸附瓦斯特性研究

申晓静¹(), 岳基伟¹^,²^,³^,^**(), 梁跃辉¹, 王辰¹, 徐金林¹, 韩奇峻¹

¹ 安徽理工大学安全科学与工程学院,安徽淮南 232001
² 煤矿深井开采灾害防治技术科技研发平台,安徽理工大学,安徽淮南 232001
³ 河南理工大学河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南焦作 454000

收稿日期:2023-08-12 修回日期:2023-11-15 出版日期:2024-02-28
通讯作者:
** 岳基伟(1990—),男,河南临颍人,博士,副教授,主要从事瓦斯灾害防治理论与技术研究。E-mail: yjwhpu@163.com。
作者简介:
申晓静 (1991—),女,河南郑州人,硕士,助教,主要从事吸附理论、水基型灭火剂、有机化学等方面的研究。E-mail: 1542467030@qq.com。
基金资助:
国家自然科学基金资助(52304200); 国家自然科学基金资助(U23A20601); 安徽省自然科学基金资助(2308085QE152); 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放基金资助(WS2022B03)

Study on gas adsorption characteristics of coal under high temperature and high pressure atmosphere

SHEN Xiaojing¹(), YUE Jiwei¹^,²^,³^,^**(), LIANG Yuehui¹, WANG Chen¹, XU Jinlin¹, HAN Qijun¹

¹ School of Safety Science and Engineering, Anhui University of Science & Technology, Huainan Anhui 232001, China
² Scientific and Technological Research Platform for Disaster Prevention and Control of Deep Coal Mining, Anhui University of Science and Technology, Huainan Anhui 232001, China
³ State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University), Henan Polytechnic University, Jiaozuo Henan 454000, China

Received:2023-08-12 Revised:2023-11-15 Published:2024-02-28

摘要/Abstract

摘要：

深部开采面临着高温高压环境,为厘清深部煤体的吸附瓦斯特性,采用等温吸附试验、分子动力学等温吸附模型及理论分析相结合的方法,从宏观角度和微观角度,探究高温高压氛围下煤体吸附瓦斯特性。结果表明:瓦斯压力较低时,不同温度下,绝对吸附量与过剩吸附量的差值差别不大;瓦斯压力较高时,绝对吸附量与过剩吸附量的差值随着温度的升高而增大;瓦斯压力从0 MPa逐渐增加到20 MPa的过程中,煤体吸附瓦斯量分为前期快速增加、中期短暂稳定、后期逐渐减小3个阶段;煤的等量吸附热与吸附量满足指数函数关系;基于等量吸附热推演的温度-压力吸附模型可以预测任意温度和压力条件下的等温吸附瓦斯量,预测值与实测值相对误差小于12%。

关键词: 高温高压, 煤体吸附瓦斯, 吸附特性, 绝对吸附量, 过剩吸附, 等量吸附热

Abstract:

Deep mining faces high temperature and pressure environments. In order to understand the adsorption gas characteristics of deep coal bodies, an isothermal adsorption experiment was conducted to study the coal's adsorption characteristics under different temperature and pressure conditions. The experiment examined both macro and micro perspectives of the coal's adsorption behavior, molecular dynamics isothermal adsorption simulation and theoretical analysis. The research results are as follows. When the gas pressure is low, the difference between the absolute adsorption capacity and the excess adsorption capacity is not significant at different temperatures. When the gas pressure is high, the difference between the absolute adsorption capacity and the excess adsorption capacity increases with the increase in temperature. In the process of gas pressure increasing from 0 to 20 MPa, the amount of gas adsorbed by coal is divided into three stages. The growth pattern consists of a rapid increase during the initial stage, followed by short-term stability in the middle stage, and a gradual decline in the later stage. The equal adsorption heat and adsorption capacity of coal meet the exponential function relationship. The temperature-pressure adsorption model based on the equivalent adsorption heat deduction can predict the quantity of isothermal adsorption gas under any temperature and pressure conditions, and the relative error between the measured and predicted values is 10%.

Key words: high temperature and high pressure, adsorption gas of coal, adsorption characteristics, absolute adsorption capacity, excess adsorption, equal adsorption heat

中图分类号:

X936

申晓静, 岳基伟, 梁跃辉, 王辰, 徐金林, 韩奇峻. 高温高压氛围下煤体吸附瓦斯特性研究[J]. 中国安全科学学报, 2024, 34(2): 176-184.

SHEN Xiaojing, YUE Jiwei, LIANG Yuehui, WANG Chen, XU Jinlin, HAN Qijun. Study on gas adsorption characteristics of coal under high temperature and high pressure atmosphere[J]. China Safety Science Journal, 2024, 34(2): 176-184.

图/表 16

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真密度/ (g·cm^-3)	视密度/ (g·cm^-3)	孔隙率/%	坚固性系数	煤的工业分析
真密度/ (g·cm^-3)	视密度/ (g·cm^-3)	孔隙率/%	坚固性系数	水分%	灰分/%	挥发分/%
1.42	1.39	5.67	0.94	1.03	8.09	16.98

温度/K	h	i	R²
303.15	0.123 67	13.036 78	0.974 72
323.15	0.125 01	13.183 58	0.975 81
343.15	0.126 73	13.316 5	0.977 17
363.15	0.128 17	13.452 48	0.978 28

V/ (mL·g^-1)	d	C	相关系数	Q_st/ (kJ·mol^-1)
5	-807.25	16.215 5	0.997 73	6.711 3
10	-836.11	17.140 84	0.997 66	6.951 3
15	-875.64	17.835 47	0.997 54	7.280
20	-933.15	18.501 57	0.997 29	7.758

高温高压氛围下煤体吸附瓦斯特性研究

Study on gas adsorption characteristics of coal under high temperature and high pressure atmosphere

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