空化水射流声震效应强化煤层瓦斯解吸渗流的实验  

Experimental analysis of coal bed methane desorption and seepage under sonic vibrating of cavitation water jets

作　　者：李晓红[1] 冯明涛[1] 周东平[1] 夏彬伟[1] 

机构地区：[1]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044

出　　处：《重庆大学学报（自然科学版）》2011年第4期1-5,共5页Journal of Chongqing University

基　　金：国家自然科学基金委专项创新研究群体基金资助项目(50621403);国家自然科学基金资助项目(50604019)

摘　　要：针对含瓦斯煤层微裂隙、低透气性、高吸附的赋存状态以及煤层瓦斯难抽采的问题,提出了利用空化水射流声震效应强化瓦斯解吸渗流的方法。本文研究了空化水射流声震效应促进煤层瓦斯解吸渗流的机理,对空化声震效应作用下煤样的解吸渗流特性进行了对比实验研究。实验表明:在空化数为0.020 0的条件下,空化声震效应作用下的煤样瓦斯解吸量增加36.9%,解吸时间缩短19.6%,空化声震效应作用效应下瓦斯的渗流速度明显增大,可达0.383 3mL/s,提高率为35.3%。A way to enhance coal bed methane desorption and seepage by sonic vibrating of cavitataion water jets is proposed because the gas coal seams have the intrinsic properties of micro-porosity,low permeability and high adsorption.The mechanisms of how the sonic vibrating effects promote methane desorption and seepage are analyzed,and the contrast experiments of methane desorption and seepage under sonic vibrating effects are also provided.The results show： when the cavitation number is 0.020 0,under sonic vibrating effects,the volume of coal bed methane desorption increases by 36.9%,and the time for coal bed methane desorption reduces by 19.6%.The speed of coal seams methane seepage is significantly increased by 35.3% and arrives at 0.383 3 ml/s.

关 键 词：空化水射流 声震效应 瓦斯解吸 渗流 

分 类 号：TD712[矿业工程—矿井通风与安全]