摘要
研究静电场作用下含瓦斯煤体的放散特性和致因机理，结果表明：静电场主要影响了△p的45～60S的放散过程；放散初速度随着电压的升高而变大（变小），在某一特征电压下达到最大值，其后逐渐趋近平缓；特征电压累计加电时，△p呈现上下波动中趋大（趋小）的现象，在撤掉电场时△p并未回落至初始值，并保持一定的时间记忆效应，可能使煤体发生了塑性损伤。其机理是静电场使得煤表面的吸附势阱深度增加和电负性增强两者相互竞争的结果。
Under the action of the electrostatic field, the mechanisms of causation and diffuse properties of coal contained gas were studied. The results show that the methane diffusion process between 45 and 60 s is the main effect of the electrostatic field. The initial speed of methane diffusion goes up as voltage rise, and reaches a maximum in a certain voltage, then approaches the gentle by gradually. The value of the initial speed of methane diffusion（△p） is pres- ented the tendency of increase in fluctuated up and down by the certain accumulative voltage. It can not drop back to initial value when closes electrostatic field. This memory effect maintaines a certain amount of time, may be due to the electrostatic field which makes coal plastic damage to happen. The cause of the phenomenon and mechanism is the change and competing between adsorption potential and electronegativity.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第6期962-966,共5页
Journal of China Coal Society
基金
国家自然科学基金重点资助项目(50834005)
国家"十一五"科技支撑计划资助项目(2009BAK54B03)
中央高校基本科研业务费专项资金资助项目(2010YZ05)
关键词
静电场
放散初速度
时间记忆效应
塑性损伤
electrostatic field
initial speed of methane diffusion
time memory effects
plastic damage
