基于碳同位素分析技术的采空区混合瓦斯涌出来源分析

Source Analysis of Mixed Gas Emission in Goaf Based on Carbon Isotope Analysis Technology

为了定量分析采空区混合瓦斯涌出来源比率,提出以碳同位素分析技术对煤矿采空区瓦斯来源进行研究,利用数学方法推导出了两端元混合瓦斯气体的碳同位素值计算公式。以实际矿井为例,实测该矿3#煤层与邻近2~#煤层原煤解吸气样的碳同位素值,同时实测距开切眼位置不同距离的上隅角、高抽巷中的混合瓦斯气体的碳同位素值,通过分析计算得出各位置抽采混合气样中来自不同煤层的瓦斯气体的比例,结果表明,3~#煤层开采过程中,上隅角的混合瓦斯中3#煤层的贡献率达92%以上,高抽巷中的混合瓦斯中3~#煤层的贡献率为87%。研究结果可为工作面的瓦斯治理方案提供参考依据。

In order to quantitatively analyze the emission source ratio of mixed gas in goaf,the carbon isotope analysis technology is proposed to study the gas source in goaf,and the calculation formula of carbon isotope value of mixed gas in two end element is derived by using mathematical method.The carbon isotope values of desorption gas samples from No.3 coal seam and adjacent No.2 coal seam in the mine were measured,and the carbon isotope values of mixed gas in upper corner and high drainage roadway with different distances from the open cut position were measured.Through analysis and calculation,the proportion of gas from different coal seams in the extracted mixed gas samples at each position was obtained.The results show that the mixed gas in the upper corner in the mining process of No.3 coal seam is more stable the contribution rate of No.3 coal seam in the mixed gas is more than92%,and that of No.3 coal seam in the mixed gas of high drainage roadway is 87%.The research results can provide a reference for the gas control scheme of working face.