煤层瓦斯含量测定定点取样方法研究进展

Sampling methods for coalbed gas content direct determination

基于文献调研及前期研究,分析了目前煤矿井下煤层瓦斯含量直接测定时所采用定点取样方法及其弊端,阐述了学者们提出的改进型定点取样方法,并对煤层瓦斯含量测定定点取样方法的研究进行了展望,指出:1取样过程瓦斯损失量小、取样时升温低、机械复杂度低是基于煤芯管法定点取样方法的发展方向;2开展煤储层条件下的瓦斯运移规律研究,建立并完善各种基于煤芯管法的定点取样方法的瓦斯损失量模型;3适用于松软煤层的定点取样方法的研发亟待开展;4基于负压气力输送理论的定点取样方法是定点取样方法研究的趋势,动态颗粒煤变负压瓦斯解吸规律是建立对应瓦斯损失量模型的基础研究。

The shortages of existing sampling methods for the direct determination of coal seam gas content was analyzed,and the development of sampling methods for the direct determination of coal seam gas content was presented in this review. Some suggestions were provided for the development of sampling methods. The new methods based on the coal tube methods should be aim at decreasing the gas loss content,temperature rising and simplifying the device complexity. Gas transportation laws under coal reservoir conditions should be studied to calculate the gas loss content when sampling with the newly sampling method. The suitable sampling method applied to determination the gas content in the soft coal seam should be developed.Sampling method based on the negative pressure pneumatic conveying was the tendency of the sampling method development,and the gas desorption law under swing- negative pressure and dynamic particle should be studied to model the gas loss content determination during the process of sampling.