瓦斯压力对低透性煤吸附-解吸特性及孔隙分布的影响  

Effect of Gas Pressure on Adsorption-Desorption Characteristics and Pore Distribution of Low Permeability Coal

作　　者：陈思粮 江泽标[1,2] 吴少康 权西平 杨希法 莫桥顺 CHEN Siliang;JIANG Zebiao;WU Shaokang;QUAN Xiping;YANG Xifa;MO Qiaoshun(School of Mining,Guizhou University,Guiyang 550025,China;Guizhou Key Laboratory of Comprehensive Utilization of Non Metallic Mineral Resources,Guiyang 550025,China;School of Energy and Mining,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]贵州大学矿业学院,贵阳550025 [2]贵州省非金属矿产资源综合利用重点实验室,贵阳550025 [3]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《煤炭技术》2024年第3期169-172,共4页Coal Technology

基　　金：贵州省科技厅项目(黔科合支撑[2020]4Y050)。

摘　　要：为了从微观的角度探究瓦斯压力对深部低透性煤层吸附-解吸特性及孔隙分布的影响,采用低磁场核磁共振技术(NMR),开展深部低透性煤不同瓦斯压力下的吸附-解吸试验。试验发现:瓦斯吸附态、游离态和自由态下,T_(2)谱幅值积分与瓦斯压力呈现较好的线性关系,其拟合结果R^(2)均大于0.973 48,微观自由态瓦斯在瓦斯压力等于3.739 MPa处瓦斯的吸附-解吸出现了迟滞效应。不同瓦斯压力下,孔径类型分布差距较大,煤样内部孔隙分布主要是小孔占据大部分,而中孔和大孔所占比列较小。研究结果对深部低透性煤矿资源开采具有一定的指导意义。In order to explore the effect of gas pressure on adsorption desorption characteristics and pore distribution of deep low permeability coal seam from a microscopic point of view,low magnetic field nuclear magnetic resonance(NMR)technology was used to carry out adsorption desorption tests of deep low permeability coal under different gas pressures.It was found that in the adsorption state,free state and free state,the T_(2) spectral amplitude integral showed a good linearrelationship with the gas pressure,and the fitting results R^(2) were all greater than 0.97348.Hysteresis effect appeared in the adsorption and desorption of the gas in the microscopic free state when the gas pressure was equal to 3.739 MPa.Under different gas pressures,there is a big difference in the distribution of pore size types.The pore distribution in coal samples is mainly dominated by small pores,while the proportion of medium pores and large pores is small.The research results have a certain guiding significance for deep and low permeability coal mining resources.

关 键 词：不同瓦斯压力 吸附-解吸特性 核磁共振T2谱 深部低透性煤层 孔隙分布 

分 类 号：TD712[矿业工程—矿井通风与安全]