膜科学与技术

中空纤维膜组件壳体流体分布与阻力研究

作者：庄黎伟¹，²，许振良¹，

单位： 1．西陇科学股份有限公司，广东，汕头，515000；2．化学工程国家重点实验室，华东理工大学膜科学与工程研发中心，上海，200237

关键词：中空纤维膜组件；CFD；流体分布；阻力

出版年,卷(期):页码： 2018,38(3):25-33

摘要：

采用计算流体力学（CFD）和辅助实验的方法，在操作流量范围内（4.62～20 m3·h-1），研究了中空纤维膜组件壳体的流动分布和各部件阻力。研究结果显示：壳体各部件的阻力随着体积流量的增大而增大，且增速均不断提高；顶部胶水层的阻力曲线较其他部件，更接近线性。随操作流量的提高，顶部胶水层阻力占总能耗的比例不断下降，而其余部件则相反。整个壳体惯性阻力系数较高，所以在实际操作过程中，高流量运行会降低总能耗分配于过滤推动力的比例。底部分布器造成不均匀的初始流动分布，但分布的均匀性会随着高度的增大而变好。在组件正常操作流量范围，壳体内速度分布仅与几何结构有关，与操作流量无关。

Computational fluid dynamics (CFD) simulation and supplementary experiment have been conducted to investigate the fluid distribution inside the hollow fiber membrane module housing and the fluid resistance caused by individual part of the housing within the operating volumetric flow rate range (4.62～20 m3·h-1). The results showed that the fluid resistance caused by every individual part of the housing increased as the volumetric flow rate increased with an accelerated increase rate. As for the fluid resistance caused by the upper resin, it increased almost linearly with the volumetric flow rate. As the volumetric flow rate increased, the proportion of the energy consumption of upper resin decreased whereas the ones of the other parts of housing increased. The ratio of the inertial resistance to the overall resistance is high for the housing. Therefore, the effective energy consumption as the driving force of the filtration will be low if the hollow fiber membrane module is operated with a high volumetric flow rate. The lower manifold caused non-uniform initial fluid distribution, which will get increasingly more uniform as the fluid flowed upward. In normal operating volumetric flow rate range, the fluid distribution within the housing depends on the structure of the housing and is independent of the volumetric flow rate.

庄黎伟（1988-），男，江苏丹阳市人，博士，主要从事膜设备设计与膜过程强化的CFD研究。E-mail: zlwdml3344@hotmail.com *通讯作者，E-mail: chemxuzl@ecust.edu.cn

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