The internal structure design of membrane module is very important for gas removal performance using membrane contactor via physical absorption. In this study, a novel membrane contactor developed by weaving polytetrafluoroethylene (PTFE) hollow fibers was applied to remove CO₂ from 60% N₂ + 40% CO₂ mixture (with CO₂ concentration similar to that of biogas) at elevated pressure (0.8 MPa) using water as absorbent. Compared with the conventional module with randomly packed straight fibers, the module with woven PTFE fibers exhibited much better CO₂ absorption performance. The weaving configuration facilitated the meandering flow or Dean vortices and renewing speed of water around hollow fibers. Meanwhile, the undesired influences such as channeling and bypassing were also eliminated. Consequently, the mass transfer of liquid phase was greatly improved and the CO₂ removal efficiency was significantly enhanced. The effects of operation pressure, module arrangement, feed gas, and water flow rate on CO₂ removal were systematically investigated as well. The overall mass-transfer coefficient (K_OV) varied from 1.96 × 10⁻⁵ to 4.39 × 10⁻⁵ m/s (the volumetric mass-transfer coefficient K_La = 0.034–0.075 s⁻¹) under the experimental conditions. The CO₂ removal performance of novel woven fiber membrane contactor matched well with the simulation results. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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在高压下使用新型PTFE中空纤维膜接触器提高CO2吸收效率

膜组件的内部结构设计对于使用膜接触器通过物理吸收的气体去除性能非常重要。在这项研究中，通过编织聚四氟乙烯（PTFE）中空纤维开发的新型膜接触器用于在高压（0.8下）从60％N ₂  + 40％CO ₂混合物（CO ₂浓度类似于沼气）中去除CO ₂。MPa），用水作吸收剂。与具有随机堆积的直纤维的常规组件相比，具有机织PTFE纤维的组件表现出更好的CO ₂吸收性能。编织结构有利于中空纤维周围的曲折流动或迪安涡旋和水的更新速度。同时，还消除了不希望的影响，例如窜动和旁路。因此，极大地改善了液相的传质，并且显着提高了CO _2的去除效率。还系统地研究了操作压力，模块布置，进料气和水流量对CO ₂去除的影响。整体传质系数（K _OV）从1.96×10 ^-5到4.39×10 ^-5 m / s（体积传质系数K _L a = 0.034–0.075 s ^-1）在实验条件下。新型机织纤维膜接触器的CO ₂去除性能与模拟结果吻合良好。©2017美国化学工程师学会AIChE J，2017