【作者】 谢建林；

【导师】 郭勇义； 吴世跃；

【作者基本信息】 太原理工大学 ， 采矿工程， 2004， 硕士

【摘要】 煤层气是指在煤化过程中生成并以物理吸附形式储集在煤层中的以甲烷为主的自生自储天然气，故亦称煤层甲烷。在我国煤炭工业中称作煤层瓦斯。 煤是一种具有发达孔隙系统的固态物质。煤层中的孔隙和裂隙是煤层气储存的空间和扩散运移的通道。煤层的孔隙性是煤层储集层最根本的特征。煤的孔隙特征不仅决定着煤的吸附、扩散和渗流特性，而且对煤的力学性质也有一定的影响。 本文总结和研究了前人在煤结构方面的理论，这些理论均能够解决与煤结构有关的某一方面的具体的问题。在这些理论中，本文通过比较认为把煤当成是一种固溶体的理论更符合煤的特性，也使得我们能够更全面地研究煤的吸附问题。在煤的这种固溶体结构中，分子组成十分复杂，既有小分子，也有大分子，大、小分子间通过VanderWaals力结合在一起。 本文研究了可以用来处理煤与甲烷吸附的各种计算模型，这些模型基于煤孔径可能的具体的形状而发展成为平板型模型、圆 太原理_l:人学硕十研究生学位论文筒型模型等。对于我们根据不同的煤种不同的煤结构来进行研究提供了便利。 本文总结了用来研究煤孔径结构和表面特性的各种实验方法:NZ吸附法、COZ吸附法、压汞法、比重法、NMR旋转一松弛测量法、小角散射技术等。每一测量技术都有其局限性，不能完整概括出煤的物理特征，对煤孔结构特征的描述也很有限。因此，综合凡种技术的测量结果来获得煤孔隙特性的全面理解很重要。 国内外学者对于煤与甲烷吸附的研究也很多，他们大都采用通过液氮温度下测量氮气在煤层中的吸附量来分析煤的孔径分布及其表面特性。这些研究因处理煤与瓦斯所处状态而假设的实验条件与真实煤层条件相差很远，而且处理数据的方法也很单调，对于煤层的表面性质的研究更是有所忽略。本文在分析和比较了各种吸附的模型后，认为L一F方程结合用吸附相密度校正的方法很适合用来研究煤与甲烷的吸附，并且根据所建立的模型结合实验数据计算了煤与甲烷气体吸附后表面自由能的降低值，找到用来反映煤吸附甲烷后表面微观性质变化的宏观反映量。更多还原

【Abstract】 Coal bed gas is a sort of nature gas which lies in coal bed as a form of physical adsorption ,it is also called coal bed methane.Coal is a sort of solid state substance which have developed hole system, and the hole is the channel of storing and diffusing of coal bed methane. The hole system is the basis character of coal which determined the adsorption ,diffuse and seep, also have the infection for coal mechanics habitude.In my paper, the theory of coal structure were researched which have been done many times by the former scholar. I summarized and thought that the coal is a dissolved solid substance, which havea complex composed structure, and have many small molecule which combined with VanderWalls.In my paper, the calculate model about coal and methane were studied, including the flat model, the cylinder model etc. Every model have its advantage and disadvantage. Which have practiced meaning as we studied the absorption about coal and methane.In my paper, many ways for the account of adsorption capacity were summarized:N2 ways,CO2 ways, pressing-mercury ways specific ways etc. Every ways have its localization, and can not generalize the coal physical character, also have limited describing for coal hole system, so we should sum more technique to study.Many people have studied the absorption about methane, they commonly measured the absorption quantity to reflect the coals hole distributing, and the experiment condition is far from the practice condition, also date processing ways is simple, more they ignored the study for coal surface characteristic.In my paper, much models were compared and I thought L-F equation have a superiority impact for the adsorption study of coalwith methane, also calculated the coal surface free energy which based the experiment dates, and found a ways to reflect the microcosmic character of coal through macroscopical measure.更多还原