碟管式反渗透膜组件的导流盘表面结构设计

Optimal Design of Disk-type Membrane Module of Disc Tube Reverse Osmosis System

为解决碟管式反渗透膜(DTRO)组件因湍流特性分布不均匀而造成的膜污染问题,通过优化设计导流盘凸点结构及布局方式,采用计算流体力学(CFD)方法建立流动计算模型,提出一种高湍流凸点结构形状和最优凸点布局的导流盘表面结构设计方案。实验结果表明,这种高湍流的梯形四棱柱凸点结构及最优布局,通过增大导流盘内部湍流强度与反渗透膜表面的剪切应力,将碟管式反渗透膜组件的渗透通量提升25.8%,通量衰减率提升8.9%。

To address the membrane fouling caused by the uneven distribution of turbulence characteristics in the DTRO(disc tube reverse osmosis)membrane module system,convex structure and layout of the disk-type membrane module were optimized,a flow calculation model established by using CFD(computational fluid dynamics),and a design of the surface structure of the disk-type membrane module having convex structures with high turbulence and the optimal convex structures layout proposed.The experimental results show that the trapezoidal quadrangular prism convex structure and the optimal layout significantly increase the turbulence intensity inside the disk-type membrane module and the shear stress on the surface of the reverse osmosis membrane,thus increasing the DTRO permeate flux by 25.8%and flux decay rate by 8.9%.