煤体中CH4与CO2竞争吸附特性研究
Study on Competitive Adsorption Characteristics of CH4 and CO2 in Coal
呼应伟 1李元波 1刘帅 1杨明 1袁治程1
作者信息
摘要
为探究CO2驱替煤层CH4过程吸附机理,采用等温吸附方法,使用CH4、CO2单组分及不同配比的混合气体,研究了不同吸附压力下煤体竞争吸附特性.试验结果表明:单组分气体在煤中的吸附量与体应变呈非线性关系.混合气体在吸附过程中,混合气中CO2的浓度越大,煤体膨胀越显著,混合气的吸附量越大;混合气压力越大,混合气总吸附量越大,CH4和CO2在煤中的竞争吸附由CO2的强吸附能力主导,混合气吸附过程中,CO2吸附量始终大于CH4.
Abstract
In order to explore the adsorption mechanism of CO2 flooding coal seam CH4 process,the isothermal adsorption method is used to study the competitive adsorption characteristics of coal body under different adsorption pressures by using CH4,CO2 single component and mixed gas with different propor-tions.The results show that there is a nonlinear relationship between the adsorption amount of single compo-nent gas in coal and the volume strain.In the adsorption process of mixed gas,the greater the concentration of CO2 in the mixed gas,the more significant the coal expansion,the greater the adsorption capacity of the mixed gas.The greater the pressure of the mixed gas,the greater the total adsorption capacity of the mixed gas.The competitive adsorption of CH4 and CO2 in coal is dominated by the strong adsorption capacity of CO2.During the adsorption process of mixed gas,the adsorption capacity of CO2 is always greater than that of CH4.
关键词
CO2-ECBM/竞争吸附/混合气体/吸附压力Key words
CO2-ECBM/competitive adsorption/mixed gas/adsorption pressure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据