贵州矿区煤孔隙结构及其等温吸附特性研究  

Study on Coal Pore Structures and Its Isotherm Adsorption Properties in Guizhou Mining Fields

作　　者：沈仲辉[1,2] 李希建[1,2] 徐明智 

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]复杂地质矿山开采安全技术工程中心,贵州贵阳550025 [3]贵州省劳动保护科学技术研究院,贵州遵义563000 [4]贵州煤矿矿用安全产品检验中心,贵州遵义563000

出　　处：《煤矿安全》2017年第1期9-12,共4页Safety in Coal Mines

基　　金：贵州省重大应用基础研究资助项目(黔科合JZ字[2014]2005);贵州省教育厅资助项目(黔教合KY字(2013)112);贵州大学研究生创新基金资助项目(研理工2016081)

摘　　要：为完善贵州矿区煤孔隙结构及瓦斯吸附特性,促进煤层气的抽采和防治煤与瓦斯突出,以贵州矿区4个不同矿井煤样为研究对象,利用扫描电镜、压汞和等温吸附等手段进行测试。结果表明:贵州煤大量发育裂隙和次生孔隙,这些裂隙和孔隙是煤层瓦斯的吸附场所和流通通道;贵州煤的孔容在0.146 8~0.228 9 m L/g之间,孔比表面积在15.434~18.260 m^2/g之间,平均孔径在33.4~51.4 nm之间,煤中大孔及裂缝是孔体积的主要贡献者,5~10 nm之间的孔隙是煤比表面积的主要贡献者,煤中开放孔较少,孔隙连通性一般;瓦斯的吸附能力与孔体积、孔比表面积具有良好的正相关性,Langmuir单分子层吸附方程适合煤对甲烷的吸附。In order to improve the pore structures and adsorption properties of coal in mining fields in Guizhou Province,and promote coalbed methane drainage and prevent coal and gas outburst,taking samples from four different coal mines in Guizhou mining areas as the research objects,we use the methods of scanning electron microscope,mercury injection and isothermal injection to carry out experimental tests. The results show that Guizhou coal develops a large number of fractures and secondary porosity,and these cracks and pores are adsorption sites and distribution channels of coal seam gas; the pore volume of Guizhou coal is between 0. 146 8 mL/g and0. 228 9 m L/g,the pore specific surface area is between 15. 434 m^2/g and 18. 260 m^2/g,and the average pore diameter is between33. 4 nm to 51. 4 nm,the macro-pores and fractures are the major contributors to the pore volume,the pore diameter between 5 nm and 10 nm is the major contributor to the surface area,open hole in coal is less,and the connectivity of pore is general; gas adsorption capacity and pore volume,pore surface area has a good positive correlation,and Langmuir monolayer adsorption equation can well describe the adsorption process of coal.

关 键 词：煤孔隙结构 吸附特性 等温吸附 扫描电镜 压汞 

分 类 号：TD712[矿业工程—矿井通风与安全]