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。
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.
作者
刘永茜
LIU Yongqian(Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,China;National Key Lab of Coal High Efficient Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China)
出处
《煤矿安全》
CAS
北大核心
2019年第7期5-9,13,共6页
Safety in Coal Mines
基金
国家重点研发计划资助项目(2018YFC0808001)
“十三五”国家科技重大专项资助项目(2016ZX05045002-006)
国家自然科学基金青年科学基金资助项目(51504137,51704164)
关键词
瓦斯解吸
容阻效应
孔隙结构
双重介质
气体渗流
gas desorption
capacitive resistance effect
pore structure
binary medium
gas seepage
