In coal reservoirs, coal, gas, and water coexist. Different moisture conditions may cause different gas storage capacity. In this paper, a series of isothermal adsorption experiments were conducted which consider different coal particle sizes, moisture ratios, and gas adsorption pressures. The Dubinin-Astakhov isothermal model is adopted in our simulations, and some adsorption parameters such as capacity, rate constant, and energy are obtained. Our key results are as follows: (1) the isothermal gas adsorption characteristics of coal are influenced by moisture, where the adsorption capacity decreases as the moisture content increases. The characteristic energy of adsorption decreases both as a function of particle size and as the moisture content increases. (2) The transient adsorption capacity initially increases sharply with time, which later increases slowly and gradually reaches equilibrium. (3) From the viewpoint of moisture content and particle size, the gas adsorption characteristic is inhibited by increased moisture levels and larger sizes. At the same time, the surface area of a coal sample with smaller particle sizes is greater than that of a sample with larger particle sample. This is inferred from our experiments because the sites for adsorption increase for smaller size samples. Our results can be used to ascertain the adsorption mechanism between gas and moisture on coal.

中文翻译：

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研究水分含量，不同煤颗粒尺寸和气压对气体吸附特性的影响

在煤储层中，煤，天然气和水共存。不同的水分条件可能会导致不同的储气量。在本文中，进行了一系列等温吸附实验，这些实验考虑了不同的煤颗粒尺寸，水分比和气体吸附压力。在模拟中采用了Dubinin-Astakhov等温模型，并获得了一些吸附参数，如容量，速率常数和能量。我们的主要结果如下：（1）煤的等温气体吸附特性受水分的影响，其吸附能力随水分含量的增加而降低。吸附的特征能量随粒度和水含量的增加而降低。（2）瞬态吸附量最初随时间急剧增加，后来缓慢增加并逐渐达到平衡。（3）从水分含量和粒径的观点来看，通过增加水分含量和增大粒径来抑制气体吸附特性。同时，具有较小颗粒尺寸的煤样品的表面积大于具有较大颗粒样品的煤样品的表面积。这是从我们的实验中推断出来的，因为较小尺寸的样品的吸附位会增加。我们的结果可用于确定煤中气体与水分之间的吸附机理。粒径较小的煤样品的表面积大于粒径较大的煤样品的表面积。这是从我们的实验中推断出来的，因为较小尺寸的样品的吸附位会增加。我们的结果可用于确定煤中气体与水分之间的吸附机理。粒径较小的煤样品的表面积大于粒径较大的煤样品的表面积。这是从我们的实验中推断出来的，因为较小尺寸的样品的吸附位会增加。我们的结果可用于确定煤中气体与水分之间的吸附机理。