Pressure-retarded membrane distillation for low-grade heat recovery: The critical roles of pressure-induced membrane deformation 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of Membrane Science
年/卷/期
2019 / 579 /
页码
90-101
ISSN号
0376-7388
作者单位
Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia;Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia;Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Darlington, NSW 2006, Australia;Nanyang Technol Univ, Sch Chem & Biomol Engn, 62 Nanyang Dr, Singapore 637459, Singapore;Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia;Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia;Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia;Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia;
作者
Yuan, Ziwen;Wei, Li;Afroze, Jannatul Dil;Goh, Kunli;Chen, Yumao;Yu, Yanxi;She, Qianhong;Chen, Yuan;
摘要
Pressure-retarded membrane distillation (PRMD) is an emerging membrane process to recover energy from low-grade heat sources. The applied hydraulic pressure on the cold-water side in PRMD may strongly affect both energy conversion efficiency and membrane performance. Here, we report the first systematic study on this critical issue. A commercial nanoporous polytetrafluoroethylene membrane was evaluated as a general membrane sample over a range of applied pressures from 0 to 10 bar at a temperature difference of 40 degrees C. Our results show that the theoretically projected constant water vapor flux decreases significantly with the increase of the applied pressures, which can be attributed to the severe membrane deformation induced by pressures. The membrane in the active-layer-facing-hot-solution orientation is mechanically unstable with the complete loss of water vapor flux under 2 bar. In contrast, the membrane in the active-layer-facing-cold-solution orientation can still work under 10 bar. Combining theoretical analysis and detailed characterization of membrane physical structures, we show that the properties of membrane active layers (i.e., pore size, porosity, and thickness) deteriorate under elevated pressures. Deformed membranes have lower permeability and higher temperature polarization in PRMD, resulting in the observed lower water vapor fluxes. Our results suggest that improving the mechanical stability of membranes would be the first critical step in realizing practical applications of PRMD for low-grade heat recovery. Potential research directions for developing novel PRMD membranes are also proposed.
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关键词/主题词
Pressure-retarded membrane distillation;Low-grade heat recovery;Membrane deformation;Temperature polarization;
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