煤体瓦斯运移的容阻效应分析
Capacitive Resistance Effect Analysis of Gas Migration in Coal
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摘要: 通过对多孔介质吸附-渗流理论及实验分析,提出了对煤体瓦斯运移规律的新认识。研究结果发现:煤体结构对瓦斯运移具有容阻效应,“容储”、“阻力”二重特性并存构成了煤基质瓦斯运移的基本功能;瓦斯运移过程中的吸附特性差异体现在吸附响应时间、吸附速率增长速度、吸附平衡时间和最大吸附能力4项指标;瓦斯运移过程中扩散和渗流2种方式并存,当裂隙及大孔内瓦斯压力较中-微孔隙系统瓦斯压力高时,煤体内瓦斯运移以渗流为主,否则以扩散为主;煤体裂隙越发育,煤体对瓦斯压降变化越敏感,瓦斯解吸效率越高。Abstract: Based on the theoretical analysis of gas adsorption and gas seepage in porous media, some new opinions on the law of gas migration in coal seam were proposed with experimental analysis. The results show that, for the gas in migration, coal structure has the storage-resistance effect, the dual functions of gas charging effect and gas hindering effect form the basic feature of coal matrix; adsorption reaction time, adsorption growth rate, adsorption equilibrium time and the maximum adsorption capacity are 4 key adsorption indexes between the coal samples; diffusion and seepage are two ways of gas migration in coal seam. When the gas pressure in the fractures or the large holes are higher than the gas pressure in the micro-nano-pore system, the gas migration velocity is dominated by gas seepage, otherwise, gas diffusion would be the main factor; the more developed the fracture, the more sensitive the coal body to the change of gas pressure drop, and the higher the gas desorption efficiency.
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Keywords:
- gas desorption /
- capacitive resistance effect /
- pore structure /
- binary medium /
- gas seepage
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