煤对三元混合气体的吸附特性研究

通过对4种不同煤级煤开展相同浓度配比的70%CO₂+20%N₂+10%CH₄三元混合气体的等温吸附实验，探讨了煤对混合气体的吸附特征。实验结果表明:不同煤级煤对混合三元气体（70%CO₂+20%N₂+10%CH₄）的等温吸附曲线具有明显抛物线的特征，不再适于用Langmuir方程，而多项式模型能够准确地描述煤对混合气体的吸附特性。无烟煤（4号煤样）对混合气体的吸附量明显高于焦煤（3号煤样）、气煤（2号煤样）、褐煤（1号煤样），后3种煤样吸附混合气体（70%CO₂+20%N₂+10%CH₄）的总体变化趋势是随着煤级的升高吸附量降低，即V_1号>V_2号>V_3号，中煤级焦煤的吸附量最低，这与以往单组分气体吸附量随着煤级的升高而增大有所不同，可见混合气体的成分以及所占比例均对煤的吸附性能产生重大的影响。

Research on adsorption properties of coal to ternary mixed gases

The isothermal adsorption experiment of ternary mixed gases （70%CO₂+20%N₂+10%CH₄） on four types different coal ranks coal samples were carried out to discuss the adsorption characteristics of coal to mixed gas. The results show that isothermal adsorption curves of different coal ranks coals to the ternary mixture （70%CO₂+20%N₂+10%CH₄） have an obvious characteristics of parabola，which are no longer suitable for Langmuir equation，and the polynomial model can accurately describe the adsorption behavior. The adsorption amount of 4^# coal sample （anthracite） on mixed gas is obviously higher than that of other types(3^# is brown coal，2^# is gas coal，1^# is coking coal)，and adsorption amount of the other three kinds of coal samples reduces with the increasing of coal rank，namely the V_1#>V_2#>V_3#，and the adsorption amount of medium coal ranks coal is the lowest，which are different with previous study results that adsorption amount of one-component gas increases with the increase of coal rank，so the ingredient and proportion of mixed gases have a significant impact on the adsorption properties of coal.