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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.
Aspen Adsorption was used to simulate the adsorption of three component CBM with the volume ratio of CH4, CO2 and N2 of 0.3: 0.2: 0.5. The breakthrough curves of the three gases and the axial load distribution of the adsorption column were obtained. Pressure and gas flow rate on the adsorption and penetration curves.The results show that the calculated values of the methane and carbon dioxide breakthrough curves in the multi-component gas are in good agreement with the experimental values.The methane breakthrough curve appears when the three components are adsorbed Hump “shape, the penetration time is 19.5% longer than the second component; the ratio of coal to the gas adsorption capacity of three components of CO2, CH4 and N2 is 1: 0.9: 0.348; the peak position of methane breakthrough curve increases with pressure After the shift and ”hump " tends to be flat, the penetration time and the amount of change in adsorption and pressure increase the same proportion; penetration curve with the flow rate increases steep, the flow rate from 0.2mmol / s to double , The breakthrough time of methane decreased to 49.2% and the length of mass transfer zone increased to 1.75 times of the original one.If the flow rate increased, the adsorption ratio of CO2 was more favorable for CH4 adsorption.