三组分煤层气吸附的数值模拟研究  

Simulation of adsorption process of ternary-components coal-bed methane

作　　者：刘金元[1] 王煤[1] 陈超[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《中国矿业大学学报》2013年第6期965-969,共5页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2011CB201202)

摘　　要：采用Aspen Adsorption对CH4,CO2,N2组成体积比为0.3∶0.2∶0.5的三组分煤层气的吸附进行数值模拟研究,得到了3种气体的穿透曲线和吸附柱轴向负载分布,考察了压力和气体流速对吸附和穿透曲线的影响.研究表明:对多组分气体中甲烷和二氧化碳穿透曲线的模拟计算值与实验值基本吻合.三组分吸附时,甲烷穿透曲线出现"驼峰"形状,穿透时间较二组分时延长19.5%;煤对CO2,CH4,N2三组分气体吸附能力的比例为1∶0.9∶0.348;甲烷穿透曲线峰值位置随压力增大后移且"驼峰"趋于平缓,其穿透时间和吸附量的变化比例与压力增大比例相同;穿透曲线随流速增大趋于陡峭,流速从0.2mmol/s增大一倍时,甲烷的穿透时间减小至原来的49.2%,传质区长度则增大至原来的1.75倍.流速加大对CO2吸附比对CH4吸附更有利.The adsorption process, supported by Aspen Adsorption software, was simulated for ternary-component coal-bed methane composed of 30% CH4,20% CO2 and 50% N2. The effects of operating pressure and gas velocity on the breakthrough curves and adsorption char- acteristics were studied. The concentration variations of CH4, CO2and N2 with adsorption time, and the axial distributions of CH4 , CO2 and N2 adsorption quantity with the adsorption column were obtained. The results show that the simulation values of the multicomponent gas for methane＇s and carbon dioxide＇s breakthrough curve are basically consistent with the results of experiment. The breakthrough curve of methane appears ＂hump＂ shape and the break- through time prolongs 19.5% than that of binary-component gas. The ratio of saturated ad- sorption quantity of CO2 ,CH4 ,N2 is 1 ： 0.9 ： 0. 348. The peak of breakthrough curve gradual- ly move to right and the hump flattens with the increasing pressure. The changed ratio of the breakthrough time and the adsorption quantity of methane is the same as the increases of pres- sure. The breakthrough curve tends to steep, the breakthrough time decreased to 49.2 % and the mass transfer zone（MTZ）increased to 1.75 times with the increase one times of velocity from 0.2 mmol/s. It＇s more advantageous for carbon dioxide adsorption than methane adsorp- tion when the velocity increases.

关 键 词：吸附 三组分煤层气 穿透曲线 模拟 

分 类 号：TD712.6[矿业工程—矿井通风与安全]