煤吸附CO_2气体的变形特征及孔隙影响分析  

Strains due to Carbon Dioxide Sorption and Effects of Pore Size Distributions

作　　者：于鹏程[1] 祝捷[1] 张博[1] 陈孟达[1] 李广亮[1] YU Peng-cheng ZHU Jie ZHANG Bo CHEN Meng-da LI Guang-liang(School of Mechanics and Civil Engineering, China University of Mining and Technology （Beijing）, Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭技术》2017年第5期163-165,共3页Coal Technology

基　　金：煤炭资源与安全开采国家重点实验室大学生科技创新计划(SKLCRSM14CXJH09);重庆大学煤矿灾害动力学与控制国家重点实验室访问学者基金(2011DA105287-FW201508);中央高校基本科研业务费专项资金(2010QL02)

摘　　要：选取赵各庄和忻州窑的2组煤样,放置于不同压力的二氧化碳气体环境中,观测煤样的径向和轴向变形,并对煤样进行了低温液氮吸附,同时采用Langmuir方程表征煤样应变与气体压力的关系,拟合参数εmax和pL分别反映了煤的最大变形值和煤体变形随气体压力的变化程度;忻州窑煤样的吸附变形和比表面积均大于赵各庄煤样,小孔和微孔含量丰富是造成煤样比表面积和吸附变形增加的根本原因。Two groups of coal cores from Zhaogezhuang and Xinzhouyao mines were placed in CO2 sorption chamber with various gas pressures and observed the radial and axial strains of coal samples. After the measurement of sorption strains, the pore distributions of coal samples are investigated by means of liquid nitrogen adsorption. Langmuir equation can be used to describe the relationship between coal strains and gas pressures. In the fitting equations, Cr~ and pL respectively indicated the maximum strain of coal strain due to CO2 sorption and coal strain change with gas pressure. The adsorption strains and surface areas of coal samples from Xinzhouyao mine were greater than those from Zhaogezhuang mines. Therefore the high content of mieropores and mesopores in Xinzhouyao samples lead to enhance coal surface area and sorption strain.

关 键 词：气体吸附 孔隙结构 LANGMUIR方程 

分 类 号：P618.11[天文地球—矿床学]