温度对煤吸附瓦斯的动力学特性影响实验研究

为了探究温度对中等程度焦煤中甲烷的吸附解吸特征的影响规律，采用等温吸附实验和甲烷解吸实验分析煤样在不同温度下的变化情况，结合Langmuir模型、等量吸附热、煤表面自由能和解吸量模型对所得实验数据进行分析。
结果表明：随着温度的升高，甲烷吸附量及Langmuir吸附常数a、b均呈现下降的趋势；煤的吸附是放热过程，伴随着甲烷吸附量的增大等量吸附热随之增加；温度会导致煤表面自由能改变，温度升高煤表面自由能变化值减小，表现为甲烷吸附量减少；解吸曲线具有明显的Langmuir特征，温度升高会促进甲烷解吸，且最初10 min中的解吸速率增速较快。

Thermodynamics of adsorption in porous materials

In order to explore the influence rule of temperature on the adsorption and desorption characteristics of methane in moderate degree coking coal, isothermal adsorption experiment and methane desorption experiment were used to analyze the changes of coal samples at different temperatures. Combined with Langmuir model, isosteric heat of adsorption, coal surface free energy and desorption capacity model, the obtained experimental data were analyzed.
The results shows that with the increase of temperature, the adsorption capacity of methane and the adsorption constants a and b of Langmuir show a decreasing trend; the adsorption of coal is an exothermic process, and the isosteric heat of adsorption increases with the increase of methane adsorption; the temperature will lead to the change of the surface free energy of the coal, and the change of the surface free energy of the coal will decrease with the increase of temperature, so the adsorption capacity will decrease; the desorption curve has obvious Langmuir characteristics. The increase of temperature will promote the desorption of methane, and the desorption rate increases rapidly in the first 10 min.