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Thermodynamic Characteristics of Adsorption-Desorption of Methane in 3# Coal Seam of Sihe

机译：3＃煤层甲烷吸附 - 解吸热力学特征

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A series of methane adsorption-desorption isotherm experiments on anthracite of No. 3 Sihe coal mine were conducted at 20°C, 25°C, 30°C, 35°C and 40°C respectively. Based on Clausius-Clapeyron equation, isosteric heat of adsorption and maximum heat of adsorption has been calculated. These calculations indicate that the maximum heat of adsorption in process of elevated pressure (adsorption) and lowered stress (desorption) is 23.31 KJ/mol and 24.02 KJ/mol, so it belongs to physical adsorption. However, the latter is higher than the former. From the point of view of thermodynamics, in the adsorption-desorption equilibrium system, dropping pressure alone does not lead to desorption, but it improves adsorption of water vapor molecules on the surface of the coal pores. The adsorption heat of water vapor molecules is greater than 40 KJ/mol, so the methane on the surface of coal pores will be easily replaced by water vapor, and the desorption of methane occurs eventually. Thus, the gas production in coalbed methane well by pressure reduction is consistent with the negative pressure for gas extraction.
机译：一系列甲烷吸附 - 解吸等温线在3号Sihe煤矿的无烟煤上在20℃，25℃，30℃，35℃和40℃下进行。基于Clausius-Clapyyron方程，已经计算了吸附的基位热热和吸附热量。这些计算表明，在升高的压力（吸附）和降低应力（解吸）的过程中吸附的最大热量为23.31kJ / mol，24.02kJ / mol，因此它属于物理吸附。然而，后者高于前者。从热力学的角度来看，在吸附 - 解吸平衡系统中，单独的滴压不会导致解吸，但它改善了煤孔表面上的水蒸气分子的吸附。水蒸气分子的吸附热大于40kJ / mol，因此煤孔表面上的甲烷将容易被水蒸气更换，最终发生甲烷的解吸。因此，通过减压煤层气的气体生产与气体提取的负压一致。

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