摘要
进行了CH4-CO2和CH4-N2二元混合气体的等温解吸实验,分析了二元气体在解吸过程中各组分浓度的变化规律.结果表明,在CH4-N2二元气体的解吸过程中,吸附相中CH4组分的相对浓度逐渐增加,N2组分的相对浓度逐渐减少.在CO2-CH4二元气体的解吸过程中,吸附相中CO2组分的相对浓度逐渐增加,CH4组分的相对浓度逐渐减少.实验结果还证实了CO2在与CH4的竞争吸附中占据优势,而N2在与CH4的竞争吸附中处于劣势.注入CO2比注入N2可以更有效地置换或驱替煤层甲烷,提高煤层甲烷的采收率.
The isotherm desorption experiments of binary-component gas of CH_4-CO_2 and CH_4-N_2 were carried out. The variation and concentration of each component in the experiment were analyzed. The experiment results indicate that the relative concentration of CH_4 in absorbed phase increases gradually and that of N_2 decreases gradually in the isotherm desorption experiment of CH_4-N_2 binary-component gas; However, the relative concentration of CO_2 in absorbed phase increases gradually and that of CH_4 component decreases gradually in the isotherm desorption experiment of CO_2-CH_4 binary-component gas. the above results have confirmed that CO_2 occupies the predominant position while N_2 is in an inferior position in the competitive adsorption with CH_4. Therefore, CO_2-injection can replace or displace the coalbed methane and enhance methane recovery more effectively than N_2-injection.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2004年第4期448-452,共5页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展规划项目(2002CB211702)
国家自然科学基金项目(40272069)
高等学校博士学科点专项科研基金项目(20020491003)
关键词
二元气体
等温解吸
竞争吸附
煤层甲烷
采收率
binary-component gas
isotherm desorption
competitive adsorption
coalbed methane
recovery
