低频机械振动影响煤样吸附特性研究  

Adsorption properties of coal in the presence of low-frequency mechanical vibration

作　　者：李树刚[1] 赵勇[1] 张天军[2] 

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学理学院,陕西西安710054

出　　处：《中国矿业大学学报》2012年第6期873-877,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51174157;51174158);高等学校博士学科点专项科研基金项目(20096121110002)

摘　　要：利用自制的瓦斯吸附/解吸激振及测试系统,研究了不同振频对煤样吸附性能的影响.试验结果表明:不同振频对未吸附饱和煤样影响不同,10Hz促使瓦斯吸附,20,30Hz抑制吸附;趋于吸附饱和煤样受振动影响很小.进一步分析振频与扩散的关系,发现充入相同气压,振动对瓦斯孔隙吸附量影响不明显,参数B和瓦斯扩散系数均按30,20,0,10Hz逐步变大;并依据扩散特性定义了扩散度.趋于吸附饱和时,煤与瓦斯系统处于振动状态下的动态吸附平衡.采掘过程中,振频越大,受振动影响而内压改变的那部分煤体越可能瞬时突出;振频越小,突出延迟越可能出现.Gas absorption was measured at different vibrating frequencies using a vibrating gas absorption test. Adsorption onto non-saturated coal varies depending upon vibration frequency. A 10 Hz frequency normally triggered adsorption. At 20 or 30 Hz there was reduced adsorp- tion. Gas saturated samples were less affected by vibration. Comparison of vibration and diffu- sion showed that for an equivalent air pressure the gas pore adsorption volume is nearly un- changed by vibration. The diffusion parameter, B, increased at 30, 20, 0 and 10 Hz. The diffusion rate was defined. Close to saturation samples are in a state of dynamic adsorption balance. During mining, coals affected by vibration may change their internal pressure and protrude as the vibrating frequency is increased. However, lower frequencies may delay this protrusion.

关 键 词：吸附特性 低频机械振动 表面势能 外层气膜 负电荷面 

分 类 号：TD32[矿业工程—矿井建设]