平顶山矿区主采煤层孔隙特征研究

Study on Pore Characteristics of Main Coal Seam in Pingdingshan Mining Area

对平顶山矿区主采煤层丁组、戊组和己组煤样进行低温氮气吸附试验,分析等温吸附-脱附曲线形态,计算孔体积和比表面积,研究了不同煤层的孔形态及其对瓦斯的吸附-解吸能力。实验结果表明:原始煤层煤样比表面积为0.026~2.988 m^2/g,以小于8 nm的孔为主;孔隙结构复杂,大量存在一端闭合孔和"墨水瓶"孔,增加了煤层瓦斯抽采难度。

The adsorption of nitrogen in low temperature experiments were carried out on the coal samples of coal group Ⅳ, Ⅴ and Ⅵ in Pingdingshan coal mine. The morphology of isothermal adsorption-desorption curve was analyzed and the pore volume and specific surface area were calculated. The pore morphology of different coal seams and their adsorption capacity to gas were studied. The experimental results show that the specific surface area of the coal samples in the original coal seam ranges from 0.026 to 2.988 m^2/g, with the pores smaller than 8 nm being dominant. The micropores are dominated by open vents and impervious holes closed at one end.