二元气体等温吸附-解吸中气分的变化规律

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．

Variation Regularity of Gas Component Concentration in Binary-Component Gas Adsorption-Desorption Isotherm Experiments

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.