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从潞安矿区常村矿采集煤块制作成粒径为0.17～0.25 mm的煤样,利用容量法测定了6组煤样在不同压力下的瓦斯吸附量.利用最小二乘法,得到了各组煤样吸附常数.将6组煤样吸附常数作为煤块吸附常数的一个观测样本,对煤块吸附常数的均值和均方差进行了极大似然估计,并将煤块吸附常数的均值和均方差作为煤层吸附常数均值和均方差的近似值.研究表明,在煤块Langmuir体积常数和Langmuir压力常数均服从对数正态分布的前提下,均值的极大似然估计值分别为3.17和0.373,标准差的极大似然估计值分别为0.062 9和0.111,相应的变异系数估计值分别为6.40%和11.1%;为了客观地评价煤块瓦斯吸附常数的离散性,不应过多地舍弃实验结果;为了正确估计煤层的瓦斯吸附常数,应从煤层多处采集煤块.
Coal samples were collected from Changcun Mine, Lu’an Mining Area to make coal samples with particle size of 0.17 ~ 0.25 mm, and gas adsorption capacity of 6 samples under different pressures was measured by volumetric method.The groups were obtained by least square method Coal adsorption constants. Using six groups of coal sample adsorption constants as an observation sample of the coal block adsorption constants, the maximum likelihood estimation of the coal block adsorption constant mean and mean square error is carried out. Variance as an approximation of mean and mean square deviation of adsorption constants of coal seam.The results show that the maximum likelihood estimates of mean values of Langmuir volume constants and Langmuir pressure constants are 3.17 and 0.373 respectively, The maximum likelihood estimates of standard deviations were 0.062 9 and 0.111 respectively, and the corresponding coefficients of variation were estimated to be 6.40% and 11.1% respectively. In order to objectively evaluate the variability of coal gas adsorption constants, the experiment should not be abandoned Results; In order to correctly estimate the gas adsorption parameters of coal seams, coal blocks should be collected from multiple coal seams.