Simulation study of Pressure Swing Adsorption process for the CO2/CH4 mixture

• Main Authors: Yi Ming Tu, 杜奕旻
• Other Authors: T. S. Lu
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/eqkb6z

碩士 === 長庚大學 === 化工與材料工程學系 === 104 === The numerical simulation method is used to separate binary biogas (CO2/CH4) in this pressure swing adsorption study. The metal of framework (MIL-35(AL)) is packed in the adsorption bed as the adsorbent. The basic steps of PSA are Pressurization, Feed, Blow down, Purge. The assumptions of the mathematical model are: the binary gas follow ideal gas law, neglecting pressure and velocity gradient on the axial direction, extended Langmuir isotherm formula is used, the mass transfer correlation between gas phase and solid phase follow linear driving force model. The mathematical model include mass balance equation in adsorption bed, mass balance equation in adsorbent, and energy balance equation in adsorption bed, the above equations are solved by FORTRAN software combined with orthogonal collocation method. The operating parameters and conditions used in this study are referred to the paper Alexandre F.P. Ferreira et.al [1]. The results indicated that increasing the time of feed step from 250s to 350s evaluate the recovery and productivity of methane which was obtained at 100% and 6.847 mole/kg-hr. The increasing time of blow down step from 210s to 310s evaluate the recovery of CO2 which were obtained at 90.3%. The increasing velocity of purge step can raise the recovery of CO2 which was obtained at 93.6%. The increasing column length has no effect on recovery and purity.