【摘要】 为研究新疆阜康矿区主采煤层吸附孔孔隙结构特征,选取该矿区四个典型煤样,基于低温氮吸附实验绘制了煤样的吸附解吸等温线,得到煤的孔隙直径,采用BET模型和BJH模型计算了孔隙比表面积和体积等参数,分析了煤样孔隙比表面积及体积分布规律。结果表明:新疆阜康矿区煤的吸附解吸等温线回滞环很小,吸附孔以一段开口的均匀圆筒形孔为主。煤样吸附孔发育程度差别明显,导致各煤层对瓦斯吸附储存能力有所不同。各煤样孔径分布较为均衡,比表面积以过渡孔占比最大,其次为微孔及中孔;过渡孔和中孔的孔隙体积占比较大,微孔较小。煤样孔隙体积分布规律基本一致,比表面积在过渡孔和中孔范围内分布规律相同,微孔范围内分布差异较大。更多还原

【Abstract】 To study the adsorption pore structure characteristics of main coal seam in Xinjiang Fukang mining area,four typical coal samples were selected in this mining area. Based on the experimental results of low temperature nitrogen adsorption,the adsorption and desorption isotherms of coal samples were drawn,and the pore diameter is obtained. Using the BET theory and BJH theory,pore specific surface area and volume of coal samples are calculated. The distributions of pore specific surface and volume of coal samples were analyzed. The experimental results show that the adsorption and desorption isotherms of coal in Fukang mining area have very small hysteresis loop,and most of the pores are cylindrical with one end open. The difference of adsorption pore development degree of coal sample is obvious,which causes different storage capacity of gas adsorption of coal seam. The average pore sizes of each coal sample are approximately the same. The specific surface area of transition pores accounted for the largest surface area of adsorption pore,followed by micropore and mesopore; the volume of transition pore and mesopore accounted for the largest volume of adsorption pore,and the microporous accounted for the least. The distribution laws of pore volume of four coal samples are basically the same; the distribution laws of specific surface area are basically similar in mesopore and transition pores,but they are quite different in micropore.更多还原