Low-frequent Vibration on Sample Coal Desorption Property Testing

• 作 者: LiShugang[1]ZhaoYong[1]GaoYong[2]ZhangTianjun[3]
• 机 构: Xi'an University of Science and Technology Energy Institute
• 出 处: 2010中国煤矿瓦斯治理国际研讨会
• 发表日期: 2010年期

　　A vibration-based testing device is developed to study gas desorption properties under low-frequency vibration.The study finds that desorption volume and desorption rate decrease if vibration rate increases.Attenuation rate slows down.Desorption intensity and attenuation co-efficiency decreases as time extends.It indicates that under low frequent vibration, the associated molecules adsorbed are desorption-energized, but vibration makes porosity smaller, thus permeability declines and diffusion rate decreases.As a result, desorption rate slows down and desorption volume reduces.Without vibration, the original porosity remains unchanged.Though associated molecule are not energized, permeability increases and diffusion rate develops.Thus desorption rate speeds up and the volume desorbed increases.The study illustrates that low frequent vibration make porosity weaker while expands free path of molecules.Meanwhile, vibration generates small porous layers, increasing adsorbing sites, in which molecules diffuse slowly and desorption rate slows down.