煤的比表面积大小,对煤吸附甲烷的能力有很大的影响。日本大塚一雄等人通过实验室煤的比表面积测定和现场考察,发现瓦斯涌出大的砂川煤矿、大岛煤矿煤的比表面积比瓦斯涌出少的幌内煤矿、太平洋煤矿几乎要大两倍。我国的试验也证明了瓦斯容量大的煤层比表面积也相应增大。在同一井田内,各煤层的比表面积也不完全一样,即使 The specific surface area of ​​coal, coal adsorption capacity of methane has a great impact. Japan’s Otsuka Kazuhito and others through laboratory measurement of specific surface area of ​​coal and on-site inspection and found that the gas gush large sand River Coal Mine, Oshima coal surface area than the gas gushing less than Mine Mine, Pacific coal mine is almost twice as large. Our country’s test also proves that the coal with large gas capacity has a corresponding increase in specific surface area. In the same mine, the specific surface area of ​​each coal seam is not exactly the same, even though