构造煤与原生结构煤孔隙结构及瓦斯解吸特征对比研究

Comparative Study on Pore Structure and Gas Desorption Characteristics of Dtructural Coal and Primary Structure Coal

为了研究构造煤的孔隙结构对瓦斯解吸特征的影响,选取了发耳煤矿和青龙煤矿的煤样,进行了压汞试验和瓦斯解吸试验,对构造煤和原生结构煤的孔隙结构及解吸特征进行了对比分析,结果表明:原生结构煤中的大孔和中孔的孔容含量约占总孔容的12.81%~12.19%,构造煤中的大孔和中孔的孔容含量约占总孔容的69.85%~82.15%,原生结构煤和构造煤的孔比表面积占比较高的都是微孔和小孔,表明构造煤结构变化主要体现在大孔和中孔的孔容占比增加;构造煤的初期瓦斯解吸速度和瓦斯解吸量明显大于原生结构煤,主要原因是构造煤的大孔和中孔的孔容含量增加,使瓦斯有了更多的渗流通道和储存空间,增加了瓦斯解吸速度。

In order to study the influence of the pore structure of tectonic coal on the characteristics of gas desorption, selected coal samples from Faer coal mine and Qinglong coal mine, Carried out mercury intrusion test and gas desorption test, the pore structure and desorption characteristics of structural coal and primary structure coal were compared and analyzed. The results show: the pore volume content of macropores and mesopores in the primary structure coal accounts for approximately 12.81% to 12.19%of the total pore volume, the pore volume content of macropores and mesopores in structural coal accounts for about 69.85% to 82.15% of the total pore volume. The pore specific surface area of primary structure coal and structural coal is relatively high, which are all micropores and small pores, it shows that the structural change of tectonic coal is mainly reflected in the increase in the proportion of pore volume of large and medium pores;the initial gas desorption rate and the amount of gas desorption of structural coal are significantly greater than that of primary structural coal, the main reason is that the pore volume content of macropores and mesopores of tectonic coal has increased, so that the gas has more seepage channels and storage space, increased gas desorption speed.