CFD用于反渗透膜组件隔网构型的优化研究

摘要

Reverse osmosis (RO) membrane is widely used in wastewater treatment.Optimization of RO by CFD has become the focus of recent studies.This paper analyzes the influence of modified spacer filament structure on the mass transfer efficiency,energy consumption and permeate flux in the flow channel using 3D pure water permeate model.The results show that the geometry configuration of the spacer has an important influence on the flow in RO membrane.The dead zone could be decreased obviously by reducing the length of spacer filament.As the decrease of filament diameter,the eddy of countercurrent in flow channel increases and the concentration polarization is weakened.Comaring with the commercial spacer configuration,mass transfer of the modified spacer has been raised greatly with less energy consumption,and permeate flux increased by about 10％.%RO膜已广泛应用于废水处理过程,采用计算流体力学(CFD)优化RO膜组件结构是近年来研究的重点.本研究通过CFD方法建立卷式RO膜组件隔网流道的3D纯水渗透模型,对现有的商品型隔网丝构型进行改进,分析了隔网丝的结构对流道内的传质效率、能耗以及渗透通量等参数的影响.结果表明,隔网丝结构对反渗透膜流道内的流体流动具有重要的影响,随着隔网丝长度的减小,流道的流动死区面积减少明显;随隔网丝细直径的减小,流道内的逆流涡流增加,浓差极化现象减弱.改进的隔网构型较商品化的隔网,流道内传质有较大的提升,能耗明显下降,渗透通量提升了10％左右.