CFD simulation of membrane contactors for carbon dioxide absorption and stripping

• Main Authors: Hau-Yu Gan, 甘皓宇
• Other Authors: Hsuan Chang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/65786594127497826401

碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 104 === In this study, novel hybrid absorption/stripping membrane contactors (HASMC) for carbon dioxide capture using physical solvent are proposed and investigated by the computational fluid dynamics (CFD) simulation. The laminar flow model and the Volume of Fluid (VOF) multiphase model in FLUENT were employed with the membranes defined as permeable boundary conditions. Four HASMCs were studied, including the combinations of empty channel and spacer-filled channel with parallel flow and cross-flow. The fluid flow and mass transfer characteristics of spacer-filled channels show fluctuating patterns corresponding to spacer configurations. The pressure drop and mass transfer coefficients of spacer-filled channels are all higher than the empty channels. Spacer-filled channels can enhance the carbon dioxide diffusion in the liquid channel. Cross-flow configuration allows effective stripping of the absorbed carbon dioxide with the downstream membrane allocated at the same side of the liquid. Except the gas channel of the empty-channel parallel-flow modules, the mass transfer coefficients are much higher than the conventional correlations.