基于液氮吸附实验的煤层夹矸孔隙结构特征研究

煤层夹矸存在孔隙,具有吸附气体的能力。为研究沁水盆地新景矿煤层夹矸孔隙特征,选择8#煤层夹矸和15#煤层夹矸进行液氮静态吸附法实验研究。根据实验结果对新景煤矿8#煤层夹矸和15#煤层夹矸孔隙结构特征中的比表面积、孔径、孔径占比进行分析。结果表明:新景8#煤层夹矸主要以微孔和小孔为主,微孔和小孔占总孔比的92%以上,新景15#煤层夹矸主要由微孔、小孔和中孔为主,微孔、小孔占67%,中孔占到32%左右。微孔、小孔孔径大小与比表面积和吸附量有较强的相关性。

Study on Pore Structure Characteristics of Gangue in Coal Seam Based on Liquid Nitrogen Adsorption Experiment

There are pores in the gangue of coal seam, and it has the ability of adsorbing gas. In order to study the pore characteristics of coalbed gangue in Xinjing Coal Mine of Qinshui Basin, the experimental study on static adsorption of liquid nitrogen was carried out by selecting gangue from seam 8# and gangue from seam 15#. According to the experimental results, the specific surface area, pore diameter ratio and aperture in the pore structure characteristics of gangue in No. 8# coal seam and No. 15# coal seam in Xinjing Coal Mine are analyzed. The results show that the gangue in Xinjing 8# coal seam is mainly composed of micropores and small holes, which account for more than 92% of the total holes. The gangue of Xinjing 15# coal seam is mainly composed of micro hole, small hole and middle hole. The proportion of micro hole and small hole is 67%, and that of middle hole is about 32%. The size of micropore and pore size has a strong correlation with the specific surface area and adsorption capacity.