In this study, hydrophobic polytetrafluoroethylene (PTFE) and hydrophilic polyetheretherketone (PEEK) membranes were used as heat exchangers in rich‐split CO₂ capture process to recover the waste heat from the stripped gas (i.e., mixture of water vapor and CO₂). Technical feasibilities of these two membrane exchangers were assessed by heat recovery and energy intensity in the monoethanolamine (MEA)‐based carbon capture process. The heat recovery of these two membrane exchangers with different pore sizes were then systematically compared under various operating parameters. The underlying mass and heat transfer mechanisms of two membranes were also investigated and compared to figure out the suitable candidate for heat recovery. Additionally, the potential risks of using these membrane exchangers were identified and investigated. Results showed that the PTFE membrane displays a better heat recovery performance than the PEEK membrane with the same pore size. The heat recovery of both PTFE and PEEK membranes first increases to a plateau and then drops slightly with the increased CO₂‐rich solvent flow rate. The heat recovery of PTFE and PEEK membranes decreases with the increased flow rate and water vapor fraction of the inlet stripped gas, MEA temperature, and MEA concentration. Furthermore, the larger pore size results in higher heat recovery for both PTFE and PEEK membranes. PTFE membranes displayed lower MEA transfer flux than PTFE membranes at any rich MEA flow rate as the enhanced MEA transfer from the cold solution to the other side via PEEK membrane pores filled with liquid water. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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膜技术在碳捕集过程中从汽提气中回收余热：疏水性和亲水性有机膜盒

在这项研究中，疏水性聚四氟乙烯（PTFE）和亲水性聚醚醚酮（PEEK）膜被用作富分CO ₂捕集过程中的热交换器，以从汽提气中回收废热（即水蒸气和CO _2的混合物））。通过基于单乙醇胺（MEA）的碳捕获过程中的热量回收和能量强度，评估了这两个膜交换器的技术可行性。然后系统地比较了两种不同孔径的膜交换器在各种运行参数下的热回收率。还研究了两种膜的基本质量和传热机理，并进行了比较，以找出适合热回收的候选材料。此外，还确定并研究了使用这些膜交换器的潜在风险。结果表明，在相同孔径下，PTFE膜比PEEK膜具有更好的热回收性能。PTFE和PEEK膜的热回收率先增加到平稳状态，然后随着CO的增加而略有下降₂富溶剂流速。PTFE和PEEK膜的热回收率随进口汽提气的流速和水蒸气分数，MEA温度和MEA浓度的增加而降低。此外，较大的孔径导致PTFE和PEEK膜的热回收率更高。在任何丰富的MEA流量下，PTFE膜都显示出比PTFE膜更低的MEA传递通量，因为增强的MEA通过充满液态水的PEEK膜孔从冷溶液转移到另一侧。©2020年化学工业协会和John Wiley＆Sons，Ltd.