Experimental Study on the Influence of Flexible Control on Key Parameters in Reverse Osmosis Desalination

IEEE Access

Denggao Qiu¹  Lei Kou²  Xiaona Ma³  Shitan Zhang⁴  Weichun Ge⁵  Shuai Chu⁵  Yinxuan Li⁶ 

[1] Fisheries Research Institute of Fujian, Xiamen, China;Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences), Qingdao, China;Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, China;School of Electrical Engineering, Northeast Electric Power University, Jilin, China;School of Electrical Engineering, Shenyang University of Technology, Shenyang, China;State Grid Tianjin Marketing Service Center (Metrology Center), Tianjin, China;

关键词: Reverse osmosis;    variable-frequency drive;    specific energy consumption;    recovery rate;    power frequency;   

DOI  :  10.1109/ACCESS.2021.3140071

来源: DOAJ

【 摘 要 】

Variable-frequency drive (VFD) has been widely used in reverse osmosis desalination. Our purpose is to study how the VFD and pressure regulating valve affect the key parameters of reverse osmosis desalination and their action principle through experiments. Firstly, the power frequency is controlled by VFD, and the operating pressure is controlled by pressure regulating valve (needle valve) in the experiment. The feed water passes through the multimedia filter, precision filter and permeable membrane channel in turn, and permeate water and brine enter the fresh water tank and the brine tank respectively. Secondly, through experiments on seawater and brackish water respectively, the water flow rate, product water quality, energy consumption and recovery rate under different operating pressures are obtained when the power frequency is 25, 30, 35, 40, 45, and 50 respectively. Finally, combined with the working principle and mathematical model of VFD and high-pressure pump motor, the reason for the experimental results caused by the operation change is explained theoretically. The experimental results verify that for a certain recovery rate, the specific energy consumption required for water production decreases with decreasing power frequency. This provides desalination energy savings but at the expense of permeate production speed.

【 授权许可】

Unknown