煤对CO2，N2和CH4的吸附速率经验公式与异同性研究*

为了解决吸附速率拟合公式缺乏而解吸经验公式众多的问题，通过替换解吸参数、定性和对比分析各经验公式对煤吸附CO₂，N₂，CH₄吸附速率的适用性，选取4种不同煤质的煤样在0.5，1.0和2.0 MPa下进行定温吸附实验，分析压力和煤质对吸附速率的影响规律。研究结果表明:时间函数式对3种气体在不同压力和煤质下的吸附速率拟合效果最佳；压力和煤质对3种气体吸附速率的影响既存在共性又具有差异性，气体吸附速率与压力符合指数函数关系，与挥发分呈现出二次函数关系，并且压力升高会导致最低吸附速率趋向于较高变质程度煤样；CH₄和N₂的吸附速率随压力升高而升高，而CO₂的吸附速率因煤样而不同，且在同压下，不同气体的最高和最低吸附速率煤样的变质程度也不同。

Study on empirical formula and heterogeneity for adsorption rate of CO2,N2 and CH4 by coal

In order to solve the problem that the fitting formulas of adsorption rate are lacking and the empirical formulas of desorption,through replacing the desorption parameters,the applicability of each empirical formula to the adsorption rate of CO₂,N₂ and CH₄ by coal was qualitatively and comparatively analyzed.Four coal samples with different coal quality were selected to conduct the constant temperature adsorption experiments at 0.5 MPa,1.0 MPa and 2.0 MPa,and the influence of pressure and coal quality on the adsorption rate was analyzed.The results showed that the time function formula had the best fitting effect on the adsorption rates of three gases under different pressures and coal quality.The influence of pressure and coal quality on the adsorption rate of three gases was both common and different.The relationship between gas adsorption rate and pressure conformed to the exponential function,while the relationship between gas adsorption rate and volatile matter presented a quadratic function relationship,and the increase of pressure would cause the lowest adsorption rate tend to the coal sample with higher metamorphic degree.The adsorption rates of CH₄ and N₂ increased with the increase of pressure,while the adsorption rate of CO₂ varied with the coal sample,and the metamorphic degrees of coal sample with the highest and lowest adsorption rates of different gases were also different under the same pressure.