海石湾煤矿瓦斯含量直接法测定与抽采统计差异性分析

Difference Analysis Between Direct Determination and Extraction Statistics of Gas Content in Haishiwan Coal Mine

分别采用直接法测定和瓦斯抽采统计法对海石湾煤矿瓦斯含量进行了测算,发现直接法瓦斯含量测定结果与抽采瓦斯统计的瓦斯含量存在较大差异;结合实验室进行的高压与低压CO2吸附解吸实验,发现高压下煤样的CO2解吸规律呈现2种不同情况,且由于现场取样时间大于2种解吸规律的转变时间,大大低估了煤样的CO2损失量,导致直接法瓦斯含量测定结果偏小。

The gas content of Haishiwan coal mine is measured by separately using direct measurement and gas extraction statistics. It is found that there is a big difference between the direct method measurement results of gas content and extraction statistics results of gas content. Combined with the laboratory high- pressure and low- pressure CO2 adsorption and desorption experiments, it is found that CO2 desorption law of coal samples presents two kinds of different circumstances under high pressure. Due to the field sampling time is greater than the transition time of the two kinds of desorption laws, the CO2 lost quantity of coal samples is greatly underestimated, and it lead to the result that gas content measurement is too small by direct method.