低频振动对煤解吸吸附瓦斯特性分析  

Gas desorption and adsorption characteristics of coal sample on low-frequency vibrating

作　　者：赵勇[1] 李树刚[1,2] 潘宏宇[1,2] 

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西部矿井开采与灾害防治教育部重点实验室,陕西西安710054

出　　处：《西安科技大学学报》2012年第6期682-685,701,共5页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金(51174157);高等学校博士学科点专项科研基金(20096121110002)

摘　　要：研制了瓦斯吸附/解吸激振及测试系统,并进行低频振动对煤样解吸/吸附瓦斯特性试验。解吸试验发现低频振动能阻碍瓦斯气体解吸;吸附试验显示不同频率对煤样吸附瓦斯的影响不同。解吸试验结果表明,低频扰动增加了煤样内部吸附位,并使气体分子自由程变大,瓦斯扩散速率减慢,不利于气体分子解吸;吸附试验结果认为,低频扰动作用下,煤体温度升高,煤样内部煤分子吸附势垒加深,分子间作用势变大,煤基质外表面瓦斯气体膜破裂加剧同时吸附位增多,这4种因素共同作用下导致不同频率对煤样产生的影响不同。This paper illustrates gas-desorption excitation testing system, which conducts low-frequency vibration on the coal sample desorption/adsorptiQn characteristics of the test gas in the desorption experiment. It finds that low-frequency vibration can prevent gas desorption through different frequency by testing sample coal, and that frequency of different sample coal gas adsorption varies. Research on adsorp-tion experiments concludes low-frequency disturbances adsorption increases sites within sample coal and makes path of gas molecules larger, leading to slow gas diffusion rate which is not conducive to the desorption of gas molecules. The test suggests that as low-frequency disturbances in the coal body temperature rises, molecules adsorbs inside sample coal and adsorption force increases, leading to intensity of inter-molecular potential and forming methane on outer surface of coal matrix so that gas membrane ruptures, thereby increasing adsorption sites. Under the impact of these four factors, different frequency will have different impact on sample coal.

关 键 词：低频振动 解吸 吸附 吸附势垒 分子作用势 吸附位 

分 类 号：O319.56[理学—一般力学与力学基础]