基于微细观分析的煤体瓦斯吸附规律及反常点原因探究  

Research on the law of coal gas adsorption and the reasons for abnormal points based on microscopic analysis

作　　者：郭立稳 杨子恩[1] 张嘉勇 陈建 GUO Liwen;YANG Z'en;ZHANG Jiayong;CHEN Jian(School of Emergency Management and Safety Engineering,North China University of Science and Technology,Tangshan,Hebe0i063210,China;Mining Development and Safety Technology Key Laboratory of Hebei Province,Tangshan,Hebei 063210,China)

机构地区：[1]华北理工大学应急管理与安全工程学院,河北唐山063210 [2]河北省矿业开发与安全技术重点实验室,河北唐山063210

出　　处：《采矿与安全工程学报》2023年第4期838-846,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52174182);河北省自然科学基金项目(E2020209074,E2022209051);中央引导地方发展资金项目(226Z4601G);河北省高等学校青年拔尖人才项目(BJK2023086);华北理工大学青年人才托举计划项目(28438101)。

摘　　要：针对煤体微观结构对瓦斯吸附性能的作用规律尚未完善这一问题,采用煤体瓦斯吸附规律微细观综合表征试验方法,探究煤体微观表面官能团、微细观角度煤体孔结构对瓦斯吸附的影响规律,并阐释反常点的产生原因。研究结果表明:随着变质程度增加,瓦斯吸附量整体呈上升趋势,芳香烃相对含量不断升高,脂肪烃相对含量不断减少,含氧官能团相对含量不断下降。挥发分由24.33%降至14.56%,吸附常数a由12.97 cm^(3)/g增长至23.90 cm^(3)/g,芳香烃相对含量由3.80%升至9.03%,脂肪烃相对含量由12.06%降至3.90%,含氧官能团相对含量由81.73%降至49.07%;极性含氧官能团可削弱瓦斯的吸附能力,官能团结构参数C^(*)(羰基比羰基与芳香环之和)的增大阻碍瓦斯吸附过程。随着脂肪链长度的增加,煤体瓦斯吸附能力不断提高;在研究微观孔隙结构对瓦斯吸附量的影响过程中,发现孔隙结构与吸附常数a之间存在反常变化趋势,进一步分析表明表面官能团与孔隙结构存在内在关联,含氧官能团阻碍煤体大孔发育、烃类结构促进大孔发育,煤体吸附性能受多重因素影响。Aiming at the problem that the effect of coal microstructure on gas adsorption performance has not yet been perfected,the effect of coal microscopic surface functional groups and microscopic angle coal pore structure on gas adsorption was explored using the micro and micro comprehensive characterization test method.The research results show that with the increase of the metamorphism degree,the gas adsorption capacity raises as a whole,the relative content of aromatic hydrocarbons keeps increasing,the relative content of aliphatic hydrocarbons keeps decreasing,and the relative content of oxygen-containing functional groups keeps decreasing.The volatile matter decreases from 24.33%to 14.56%,the adsorption constant a increases from 12.97 cm^(3)/g to 23.90 cm^(3)/g,the relative content of aromatic hydrocarbons increases from 3.80%to 9.03%,the relative content of aliphatic hydrocarbons decreases from 12.06%to 3.90%,and the relative content of oxygen-containing functional groups decreases from 81.73%to 49.07%.It was found that the polar oxygen-containing functional groups weakens the gas adsorption capacity,and the increase of the functional group structure parameter C^(*)(the ratio of carbonyl to carbonyl plus aromatic rings)hinders the gas adsorption process.With the increase of the aliphatic chain length,the gas adsorption capacity of coal is continuously improved.In the process of studying the effect of microscopic pore structure on gas adsorption,it was found that there was an abnormal trend in the relationship between pore structure and adsorption constant a.Further analysis shows that surface functional groups are intrinsically related to pore structure,and oxygen-containing functional groups hinder the development of macropores in coal.Hydrocarbon structure can promote the development of macropores,and the adsorption performance of coal is affected by multiple factors.

关 键 词：微细观分析 瓦斯吸附 反常点 孔裂隙 官能团 

分 类 号：TD533[矿业工程—矿山机电]