Abstract: Energy recovery device (ERD) is of great importance for significantly reducing the power consumption of seawater reverse osmosis desalination plants. In this research，an innovative separate-chamber type fluid switcher (FS) for the FS-ERD was designed and manufactured to solve the problem of fluctuations of the flow and pressure in current design. Structural characteristics of high-pressure and low-pressure chambers for the fluid switcher were introduced and analyzed. The fluid dynamic performances of the newly designed FS-ERD were tested. The results showed that the high-pressure outlet flow could be continuously pressurized and stabilized by adjusting the openings of the high-pressure chamber. The newly designed FS-ERD could be useful in improving operation safety and reducing manufacturing cost.

Key words: seawater reverse osmosis (SWRO), fluid-switcher energy recovery device (FS-ERD), separate-chamber type fluid switcher

摘要： 能量回收装置是降低反渗透海水淡化系统能耗的关键设备，阀控能量回收装置是其中最主要的产品类型之一。针对现有阀控能量回收装置流量和压力波动的问题，本文设计和制造了用于阀控能量回收装置的分腔式流体切换器，并分析了切换器高压腔和低压腔结构设计特点。对安装有此切换器的阀控能量回收装置的流体力学特性进行了实验测试。结果表明，通过设置适宜的切换器高压腔流道开度，可有效实现阀控能量回收装置高压盐水增压原料海水过程中流量供给的连续性和流体压力的平稳性；所研制的分腔式切换器对保证装置运行安全性及降低设备制造成本具有实用价值。

关键词: 反渗透海水淡化, 阀控能量回收装置, 分腔式切换器