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为了解决注气置换煤层瓦斯技术气源选择的问题,分析了注CO2和N2在置换煤层瓦斯机理方面的效果以及煤吸附2种气体后对煤体渗透率、突出危险性的影响。分析发现,虽然注入CO2置换煤层瓦斯的效果优于N2,但煤吸附CO2后会造成煤层膨胀变形、渗透率降低、突出危险性增大的现象,且CO2在瓦斯利用系统中会导致瓦斯失
In order to solve the gas source selection problem of gas replacement coal seam gas, the effect of CO2 and N2 injection on methane mechanism of coal seam replacement and the influence of coal adsorption on the gas permeability and the outstanding risk are analyzed. The analysis shows that although the effect of CO2 substitution coal seam gas injection is better than that of N2 gas, the adsorption of CO2 will cause the coal seam to expand and deform, reduce the permeability and highlight the increasing danger, and CO2 will cause gas loss in the gas utilization system