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Optimization of feed channel of full-effective membrane modules based on CFD simulation and RSM analysis

Authors： LIN Wei-chen, SHAO Rui-peng, WANG Qiao, LEI Jing, WANG Xiao-mao, HUANG Xia

Units： (1.School of environment, Tsinghua university, Beijing 100084, China;

KeyWords： reverse osmosis; spiral-wound membrane elements; feed channel; computational fluid dynamics (CFD); response surface methodology (RSM)

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2020,40(6):88-95

Abstract：

The feed channel of the new full-effective membrane element is equipped with a water barrier, which changes the streamlines and improves the hydraulic performance. In this study, the coupling of computational fluid dynamics (CFD) and response surface methodology (RSM) was used to compare the hydraulic performances of the full-effective membrane channel and the traditional membrane channel, explore the influence of geometric channel parameters and inlet flow rates on the hydraulic performance, and optimize the design of the full-effective membrane channel based on a multi-objective genetic algorithm model. The results show that CFD simulation can well explain and predict the hydraulic behavior in the flow channel. Under the same operating conditions, although the feed channel pressure drop and the uniformity of flow field of the full-effective membrane increased by 32% and decreased by 37%, respectively, the average cross-flow velocity increased by 79% and the shear stress increased by 93% compared to the traditional membrane channel, which can effectively reduce concentration polarization effect and membrane fouling rate. The increase of the inlet opening of the flow channel can enhance the uniformity of the flow field and reduce the feed channel pressure drop, but it will also cause the decrease of the average cross-flow velocity and the recovery rate. The optimization results show that increasing the inlet opening meanwhile appropriately increasing the inlet flow rate can effectively improve the hydraulic performance of the full-effective membrane channel. The optimization scheme should be formulated according to the actual demand.

Funds：

国家自然科学基金（51678336）；国家水体污染控制与治理重大专项（2017ZX07501-002）

AuthorIntro：

林炜琛（1994-），男，福建省泉州市人，博士生，研究方向为膜分离技术与污水资源化，E-mail：lwc17@mails.tsinghua.edu.cn

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