Experimental Research on Isobaric Adsorption of CBM

为厘定温度对煤层气吸附量的影响关系，采集彬长大佛寺煤矿4#长焰煤、佳县上高寨勘查区11#焦煤及晋城寺河煤矿东翼3#无烟煤，制备成空气干燥基样和平衡水样，分别进行25℃、30℃、35℃、40℃、45℃五个温度点的等温吸附/解吸实验。结果表明，同一温度点下，空气干燥基的吸附量基本大于平衡水样的吸附量；对实验数据进行拟合分析，发现吸附过程与解吸过程中，等压点的温度与吸附量呈线性关系。研究结果可应用于深部煤层气含气量预测、排采井等压面–采收半径的判定。 To determine the influence of temperature on the adsorption capacity of coalbed methane, samples are collected from the long flame coal in Coal Seam 4 at Dafosi Coal Mine in Binchang, coking coal in Coal Seam 11 at Shanggaozhai exploration area in Jiaxian and anthracite in coal seam 3 at east wing of Sihe Coal Mine in Jincheng. They are prepared as the air-dry basis and equilibrium water samples to make isothermal adsorption and desorption experiments at 25˚C, 30˚C, 35˚C, 40˚C and 45˚C. The results showed that the adsorption capacity of air-dry basis was larger than that of equilibrium water samples at the same temperature. Through fitting and analyzing the experimental data, it is found that there was a linear relationship between the temperature and the adsorption capacity of isobaric points in the process of adsorption and desorption. The results could be supplied to predict CBM content in deep and determine the isobaric surface-collecting radius of production wells.