【摘要】 分别进行了CH4-CO2 和CH4-N2 二元混合气体的等温吸附实验 ,并且分析了二元气体在吸附过程中各组分浓度的变化规律 .结果表明 ,在CH4-N2 二元气体的吸附过程中 ,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 -CH4二元气体的吸附过程中 ,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 .更多还原

【Abstract】 The adsorption isotherm experiments of CH₄-CO₂ and CH₄-N₂ binary-component gas were carried out respectively, and the variation regularity of each component concentration in the experiments were analyzed. The experiment results indicate that the relative concentration of CH₄ component in absorbed phase increases gradually while the relative concentration of N₂ component in absorbed phase decreases gradually in the adsorption isotherm experiment of CH₄-N₂ binary-component gas. Whereas the relative concentration of CO₂ component in absorbed phase shows a gradual increase and the relative concentration of CH₄ component shows a gradual decrease in the adsorption isotherm experiment of CO₂-CH₄ binary-component gas. These results confirm that CO₂ occupies the predominant position and N₂ locates at inferior position as they compete for adsorption with CH₄ respectively. Therefore, CO₂-injection can replace or displace coalbed methane and enhance methane recovery more effectively than N₂-injection.更多还原