煤体孔中低温液氮吸附层厚度研究  

Study on Adsorption Thickness of Low-temperature Liquid Nitrogen in Coal Body Pore

作　　者：岳基伟 岳高伟[1] 曹汉生[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《煤炭技术》2016年第2期165-168,共4页Coal Technology

基　　金：国家自然科学基金(51274090);河南省科技攻关计划项目(142102310268);中国博士后科学基金(2013M531673)

摘　　要：基于热力学原理及物理吸附机理,建立煤体吸附液氮的吸附层厚度理论,数值计算分析了孔径及吸附平衡压力对吸附层厚度(吸附层数)的影响。研究结果表明:在液氮吸附过程中,相对压力较小时,吸附层厚度随压力增大缓慢增厚,而相对压力约为0.9时,吸附层厚度出现拐点,吸附层厚度随相对压力迅速增大。同一吸附压力下,吸附层厚度(吸附层数)随孔径增大迅速减小至某一定值。相对吸附压力增大时,较大孔半径中(约大于50 nm),液氮吸附层厚度增量基本一样;但在小孔径中,液氮吸附层厚度变化较大,且孔径越小,吸附层厚度增量越大。而低温液氮吸附过程中,随吸附压力的变化吸附量与吸附层厚度具有相同的规律。Based on thermodynamics and physical adsorption mechanism, adsorption layer thickness theory of low-temperature liquid nitrogen in coal body pore is established to numerically calculate and analyze adsorption layer thickness（adsorption layer number）, which is effected by pore and adsorption equilibrium pressure. The results show that in the liquid nitrogen adsorption process, when the relative pressure is smaller, adsorption layer thickness smoothly thicken with relative pressure increasing, but relative pressure is approximately 0.9, adsorption layer thickness were to turn, adsorption layer thickness increases rapidly. At same adsorption pressure, adsorption layer thickness（adsorption layer number） increases rapidly to a certain value with the pore diameter. With relative adsorption pressure increasing, in the larger pore radius（about more than 50 nm）, the increment of liquid nitrogen adsorption layer thickness is basically same. But in smaller pore, liquid nitrogen adsorption layer thickness changes greatly, and the smaller pore is, the bigger the increment of adsorption layer thickness is. And in the nitrogen adsorption process test at low temperature, with relative pressure increasing the adsorption amount has the same law with adsorption layer thickness.

关 键 词：吸附层厚度 吸附平衡压力 吸附等温线 孔径 

分 类 号：X703[环境科学与工程—环境工程]