Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (4): 617-624.

• 分离科学与工程 • 上一篇    下一篇

湍流促进器强化微滤过程的实验与CFD模拟研究

刘元法1; 贺高红1; 丁路辉2; 窦红1; 鞠佳1; 李保军1   

  1. 1 State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China 2 Department of Biological Engineering, University of Technology of Compiegne, Compiegne 60205, France
  • 收稿日期:2011-07-04 修回日期:2011-12-01 出版日期:2012-08-28 发布日期:2011-12-01

Experimental and CFD studies on the performance of microfiltration enhanced by a turbulence promoter

LIU Yuanfa1; HE Gaohong1; DING Luhui2; DOU Hong1; JU Jia1; LI Baojun1   

  1. 1 State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China 2 Department of Biological Engineering, University of Technology of Compiegne, Compiegne 60205, France
  • Received:2011-07-04 Revised:2011-12-01 Online:2012-08-28 Published:2011-12-01

摘要： This paper reports experimental and computational fluid dynamics (CFD) studies on the performance of microfiltration enhanced by a helical screw insert. The experimental results show that the use of turbulence pro-moter can improve the permeate flux of membrane in the crossflow microfiltration of calcium carbonate suspension, and flux improvement efficiency is strongly influenced by operation conditions. The energy consumption analysis indicates that the enhanced membrane system is more energy saving at higher feed concentrations. To explore the intrinsic mechanism of flux enhancement by a helical screw insert, three-dimensional CFD simulation of fluid flow was implemented. It reveals that hydrodynamic characteristics of fluid flow inside the channel are entirely changed by the turbulence promoter. The rotational flow pattern increases the scouring effect on the tube wall, reducing the particle deposition on the membrane surface. The absence of stagnant regions and high wall shear stress are respon-sible for the enhanced filtration performance. No secondary flow is generated in the channel, owing to the streamline shape of helical screw insert, so that the enhanced performance is achieved at relatively low energy consumption.

关键词: membrane fouling, flux enhancement, turbulence promoter, computational fluid dynamics

Abstract: This paper reports experimental and computational fluid dynamics (CFD) studies on the performance of microfiltration enhanced by a helical screw insert. The experimental results show that the use of turbulence pro-moter can improve the permeate flux of membrane in the crossflow microfiltration of calcium carbonate suspension, and flux improvement efficiency is strongly influenced by operation conditions. The energy consumption analysis indicates that the enhanced membrane system is more energy saving at higher feed concentrations. To explore the intrinsic mechanism of flux enhancement by a helical screw insert, three-dimensional CFD simulation of fluid flow was implemented. It reveals that hydrodynamic characteristics of fluid flow inside the channel are entirely changed by the turbulence promoter. The rotational flow pattern increases the scouring effect on the tube wall, reducing the particle deposition on the membrane surface. The absence of stagnant regions and high wall shear stress are respon-sible for the enhanced filtration performance. No secondary flow is generated in the channel, owing to the streamline shape of helical screw insert, so that the enhanced performance is achieved at relatively low energy consumption.

Key words: membrane fouling, flux enhancement, turbulence promoter, computational fluid dynamics

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