摘要
为了查明中煤阶不同破坏程度煤的孔隙特征差异,运用低温液氮法对平顶山四矿不同破坏程度的煤样进行测试,对比分析得出了其孔隙结构及分布、分形特征和吸附性能的差异。结果表明:碎裂煤和碎粒煤的吸附平衡等温线为III型,内部大孔发育;糜棱煤为IV型,介孔含量较多;煤的破坏程度越强,总孔体积和比表面积越大,煤内部孔隙结构越复杂,氮气吸附量越大;2~4 nm孔隙的氮气吸附量主要受控于该尺度孔隙的比表面积;孔径>4 nm的则主要受控于该尺度孔隙的孔体积。
In order to find out the difference of pore characteristics of medium rank coal with different degrees of destruction, the low temperature liquid nitrogen method was used to test coal samples with different degrees of destruction in Pingdingshan No.4 mine, and the difference of pore structure, distribution, fractal characteristics and adsorption performance were obtained by comparative analysis. The results showed that the adsorption equilibrium isotherm of cataclastic coal and fragmented coal were type Ⅲ, and the macropores were developed. Mylonite coal was type Ⅳ with high mesoporous content. The greater the degree of coal destruction is, the greater the total pore volume and specific surface area is, the more complex the internal pore structure is, and the greater the nitrogen adsorption capacity is. The nitrogen adsorption capacity of 2-4 nm pores was mainly controlled by the specific surface area, while the pore diameter of more than 4 nm was mainly controlled by the pore volume.
作者
赵政
倪小明
韩文龙
李忠城
ZHAO Zheng;NI Xiaoming;HAN Wenlong;LI Zhongcheng(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Jiaozuo 454000,China;College of Geo-science and Surveying Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;China United Coalbed Methane Co.,Ltd.,Beijing 100011,China)
出处
《煤矿安全》
CAS
北大核心
2021年第7期9-14,共6页
Safety in Coal Mines
基金
国家油气重大专项资助项目(2017ZX05064-003-001)
国家自然科学基金资助项目(41872174)
教育部创新团队发展支持计划资助项目(IRT_16R22)。
关键词
孔隙类型
不同尺度
分形维数
不同破坏程度
氮气吸附量
pore types
different scales
fractal dimension
different deformation degree
nitrogen adsorption capacity