低透气性煤孔隙结构研究
Research on Pore Structure of Coal with Low Permeability
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摘要: 为了研究低透气性煤的孔隙结构特征,采用低温氮吸附法和压汞法对桂箐煤矿M9无烟煤软煤层进行试验研究,结果表明:煤的孔径分布较广泛,从微孔到可见孔及裂隙均有发育,其中微孔最为发育,孔面积最大,占总比表面积的98%以上,有利于瓦斯的储存,而构成渗透容积的大、中孔及裂隙发育较少。煤的吸附-脱附和进、退汞曲线均不重合;脱附和退汞曲线均有拐点;退汞效率低,这说明煤中存在一端封闭的不透气孔和细颈瓶型孔,导致其透气性较差,不利于瓦斯的扩散及渗流,降低了抽采效率,容易发生煤与瓦斯突出。Abstract: In order to study the pore structure characteristics of low permeability coal, we carry out experiments on M9 anthracite soft seam of Guiqing Coal Mine by low temperature nitrogen adsorption method and mercury intrusion method. The results show that the pore size distribution of coal is extensive and develops from micropores to visible holes and cracks. The micropore which is in favor of gas storage with the most distributed development and has the largest surface area, which accounts for more than 98% of total surface area. However, large pores, medium pores and fractures, which form infiltrated volume, are less development. The adsorption-desorption curve and the advance and retreat mercury curve of coal are both not overlap. Both the desorption curve and the retreat mercury curve have inflection point. And the efficiency of retreat mercury is low. All of these show that impermeable pores and neck bottle type holes closed at one end in coal, which could lead to poor permeability, be not conducive to the gas diffusion and seepage, and reduce the extraction efficiency, be prone to coal and gas outburst.
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