摘要
利用物理学、分子热力学、表面物理化学理论分析了电磁场影响煤层甲烷吸附的机理,为电磁场提高煤层甲烷抽放率提供了理论支持。研究结果表明,影响机理主要包括热效应及微观上对甲烷分子和煤表面相互作用能的影响,并对电磁场(对煤体产生)的热效应进行了估算,结果表明热效应对于甲烷吸附解吸具有重要的影响,而且由热效应产生热应力引起的应变差异形成孔隙对于甲烷的吸附解吸和运移也有积极的作用。通过对电磁场作用下煤层甲烷的吸附势垒降低量ΔE进行的计算,结果表明,ΔE与电磁场频率和强度基本呈正相关,即电磁场频率和强度越大,吸附势垒减小得越多,越有利于煤层甲烷的解吸。电磁场对煤层甲烷吸附解吸的影响对于煤层甲烷抽放提供了一种新的技术手段,研究其作用机理具有重要的理论和现实意义。
The mechanism of the influence of electromagnetic field (EMF) on coalbed methane (CBM) adsorption was analyzed by applying the theories of physics, molecular thermodynamics and surface physical chemistry, thus providing theoretical foundation for enhancing CBM drainage efficiency by EMF. Through the investigation and the estimation of heat effect caused by EMF on coal body, it was indicated that the mechanisms mainly include: the microscopical influence of the heat effect on the interactive en´ergy between methane molecules and coal surface, the important influence of the heat effect on the desorption of adsorbed methane and the active influence of the pores formed by the strain difference caused by the heat effect-produced heat stresses on methane desorption and migration. According to the result of calculating the decrease in adsorption potential barrier (ΔE) of CBM under the action of EMF, it was shown that ΔE is positively correlated to the frequency and intensity of EMF basically, i. e. the higher the frequency and intensity of EMF and the smaller the ΔE, the more beneficial to the desorption of CBM. Therefore a new technical means in consideration of the influence of EMF on the desorption of CBM was provided for CBM drainage. The research on it mechanism is of great theoretic and realistic significance.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第10期32-34,共3页
Natural Gas Industry
基金
国家自然科学基金重点项目(编号:50134040)
国家杰出青年基金资助项目(编号:59925411)
中国博士后科学基金资助项目(编号:2002032120)资助。
