This research presents a 2D mass-transfer simulation model using computational fluid dynamics (CFD) for separation of CO₂ from a binary gas mixture of CO₂/CH₄ by means of polytetrafluoroethylene (PTFE) hollow fiber membrane contactor (HFMC). Governing equations with their corresponding boundary conditions are solved using COMSOL Multiphysics and the results are validated against reported experimental data. Convection and diffusion flux vectors and concentration gradient of CO₂ species in the radial and axial directions of the HFMC are investigated. This study provides an opportunity to investigate the effects of gas and liquid cross flow velocities on the overall performance of membrane contacting system. The results demonstrate that increasing the liquid phase velocity improves the CO₂ absorption performance of the membrane system, while increasing the gas mixture velocity deteriorates the CO₂ separation of the system. The impact of hollow fiber geometry on the removal of CO₂ is investigated and the results indicate that hollow fibers with smaller inner diameter provides higher effective mass-transfer area and therefore superior CO₂ removal performance. Furthermore, the modeling predictions for the CO₂ removal are in good agreement with the experimental data under various ratios of gas to liquid velocity. The PTFE hollow fiber membrane contacting system showed a great potential for separation of CO₂ from gas mixtures.

这项研究提出了一种二维传质模拟模型，该模型使用计算流体力学（CFD）通过聚四氟乙烯（PTFE）中空纤维膜接触器（HFMC）从CO ₂ / CH ₄的二元混合气中分离出CO ₂。使用COMSOL Multiphysics解决具有相应边界条件的控制方程，并根据报告的实验数据验证了结果。对流和扩散通量矢量与CO ₂浓度梯度研究了HFMC在径向和轴向上的物种。这项研究提供了一个机会，以研究气体和液体的横流速度对膜接触系统的整体性能的影响。结果表明，提高液相速度可提高膜系统的CO ₂吸收性能，而提高气体混合速度则会降低系统的CO ₂分离度。研究了中空纤维的几何形状对去除CO ₂的影响，结果表明，内径较小的中空纤维提供了更高的有效传质面积，因此具有优异的CO ₂去除性能。此外，CO的建模预测在不同的气液速度比下，_2的去除率与实验数据吻合良好。PTFE中空纤维膜接触系统显示出从气体混合物中分离出CO ₂的巨大潜力。