Modeling of CO2 Stripping in a Hollow Fiber Membrane Contactor for CO2 Capture

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• 作者：Zhen Wang ; Mengxiang Fang ; Hai Yu ; Qinhui Ma ; Zhongyang Luo
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：27
• 期：11
• 页码：6887-6898
• 全文大小：717K
• 年卷期：v.27,no.11(November 21, 2013)
• ISSN：1520-5029

文摘

Membrane stripping is a promising method for carbon dioxide (CO₂) desorption with low energy demand. We developed a mathematical model to simulate the CO₂ stripping from the CO₂-rich monoethanolamine (MEA) solvent in a hollow fiber membrane contactor. The modeling results agreed well with literature experimental results. To improve the understanding and facilitate the optimization of the membrane based CO₂ stripping process, we investigated the effects of different operating variables including liquid flow velocity, sweeping gas flow rate, regeneration pressure, and temperature on CO₂ desorption performance. The effects of membrane鈥檚 length and diameter of membrane fiber on CO₂ desorption were also studied. Results showed that increasing membrane鈥檚 length will improve CO₂ stripping performance, but not infinitely, because of the thermodynamic limitation of absorbent, and shorter membrane module is preferred for thinner membrane. Membranes with a smaller diameter favor CO₂ desorption. To predict the influence of membrane wetting on CO₂ stripping performance, the change of CO₂ lean loading with the wetting ratio was investigated. Membrane wetting significantly deteriorates CO₂ membrane desorption performance, with CO₂ lean loading increasing suddenly once the membrane is wetted.