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为揭示煤的吸附孔结构对瓦斯放散特性影响机理,选择新疆阜康矿区典型矿井煤样,进行低温氮吸附及瓦斯放散初速度实验,研究了煤的吸附孔特征参数及其对瓦斯放散初速度的影响。结果表明:实验范围内阜康矿区煤的吸附孔中瓦斯的主要放散方式是Knudsen及过渡型;吸附孔各参数对瓦斯放散特性的影响不同,平均孔径越大,瓦斯扩散阻力越小,瓦斯放散初速度越大;孔隙及各孔径下的比表面积和孔容越大,瓦斯放散初速度越小;瓦斯放散初速度与微孔和过渡孔的孔容占比为负线性关系,与中孔的孔容占比为正线性关系,与各孔径下比表面积占比无明显关系;煤的孔隙在研究尺度范围内分形特征显著,瓦斯放散初速度随分形维数的增大而线性减小。
In order to reveal the influence mechanism of adsorption pore structure of coal on methane emission characteristics, typical coal mine samples from Fukang Mining Area in Xinjiang were selected to conduct low-temperature nitrogen adsorption and initial gas diffusion velocity experiments. The characteristics of adsorption holes in coal and their effects on initial velocity of gas release Impact. The results show that the main mode of gas emission in coal adsorption holes in Fukang coal mine is Knudsen and transitional type. The parameters of adsorption holes have different effects on gas drainage characteristics. The larger the average pore size, the smaller the gas diffusion resistance, The initial velocity is higher; the specific surface area and pore volume under pore and each pore diameter are larger, and the initial velocity of gas release is smaller; the initial velocity of gas release is negatively proportional to pore volume proportion of micropore and transition pore, The pore volume occupies a positive linear relationship, which is not significantly related to the specific surface area of each pore. The pore of coal has significant fractal characteristics within the research scale, and the initial velocity of gas release decreases linearly with the increase of fractal dimension.