文献类型：期刊文献

中文题名：瓦斯压力对煤体吸附特性及结构影响实验研究

英文题名：Experimental Study on Influence of Gas Pressure on Adsorption Characteristics and Structure of Coal

作者：徐佑林 吴旭坤

第一作者：徐佑林

机构：[1]贵州理工学院矿业工程学院,贵州贵阳550003;[2]贵州大学矿业学院,贵州贵阳550025

第一机构：贵州理工学院矿业工程学院

年份：2019

卷号：0

期号：8

起止页码：1-4

中文期刊名：煤矿安全

外文期刊名：Safety in Coal Mines

收录：CSTPCD;;北大核心:【北大核心2017】；

基金：国家自然科学基金资助项目(51764010,51874109);贵州省科技支撑计划资助项目(黔科合支撑[2019]2861)

语种：中文

中文关键词：瓦斯压力;NMR;T2谱图;峰值;吸附特性;煤体结构

外文关键词：gas pressure;NMR;T2 spectrum;peak;adsorption characteristics;coal structure

摘要：为深入研究煤体在不同压力条件下吸附瓦斯特性及煤体孔隙结构变化特征,利用核磁共振(NMR)技术对煤体吸附瓦斯进行实验研究。实验结果表明:实验煤样的微小孔峰面积>中大孔峰面积>裂隙峰面积,表明煤样的微小孔最为发育,煤体孔径以微小孔为主,空隙之间的连通性不强,瓦斯不易流通;随着压力的增加,当瓦斯压力达到一定程度后,煤体会产生新的孔隙,微小孔隙相连通构成了微孔或者中孔,中孔相互连通形成了裂隙,为下一步解吸瓦斯的流通提供了条件,出现瞬时的瓦斯快速解吸;煤样瓦斯吸附解吸特征按照峰值前后分为上升阶段、变化剧烈阶段和基本不变阶段,总体规律上,煤体瓦斯吸附量随着瓦斯压力的增大而增加;在不同的瓦斯压力作用下,核磁共振T2谱图核磁信号幅度发生显著变化,T2谱图分布面积与瓦斯压力呈线性关系逐渐增长,即煤体孔隙度随瓦斯压力增加而增加。
To deeply study the adsorption characteristics of coal body under different pressure conditions and the change of pore structure of coal body,the experimental study on gas adsorption in coal by nuclear magnetic resonance(NMR)technique was carried out.The test results show that:the micropore peak area of the experimental coal sample>the area of the large pore peak>the area of the fracture peak,indicating that the micropores of the coal sample are most developed,and the pore size of the coal body is mainly micropores,and the connectivity between the voids is not strong,gas is not easy to circulate;with the increase of pressure,when the gas pressure reaches a certain level,the coal will generate new pores,and the tiny pores will connect to form micropores or mesopores,and the mesopores will connect with each other to form cracks.It provides the conditions for gas desorption in the next step,and the instantaneous gas desorption occurs;the gas adsorption and desorption characteristics of the coal sample are divided into the ascending phase,the violent phase,the basically constant phase.The gas adsorption capacity increases with the increase of gas pressure generally.Under different gas pressures,the amplitude of nuclear magnetic signal of nuclear magnetic resonance T2 spectrum changes significantly,and the distribution area of T2 spectrum increases linearly with gas pressure.That is,the porosity of the coal increases as the gas pressure increases.