Strong brine energy recovery device based on reverse osmosis desalination technology

Abstract

This invention discloses energy-recovery device for strong brine based on desalination technique by reverse osmosis, which comprises hydraulic cylinder with guide bar connected to piston; water inlet three-way solenoid valve with one end connected to end of guide bar, and other two ends connected separately to water outlets of low and high pressure water-feed pumps; drainage three-way solenoid valve with one end connected to the hydraulic cylinder end far away guide bar, and other two ends connected to strong brine discharge pipes of reverse osmosis membrane; sensor, to obtain the position signal of piston; controller, to control the synchronized open and shut of two aforementioned three-way solenoid valves. It has high efficiency, runs stably, switches quickly and fit to spread in industry.

Description

technical field [0001] The invention relates to a concentrated brine energy recovery device based on reverse osmosis desalination technology. Background technique [0002] In the process of producing fresh water, the reverse osmosis desalination system needs to continuously discharge high-pressure concentrated brine. The pressure energy of this part of concentrated brine is about 70% of the input energy of the high-pressure feed water pump in the reverse osmosis desalination device, and its recovery can save energy consumption. China ZL01130627 discloses a valve-controlled residual pressure recovery device for a reverse osmosis desalination system. The device has a simple structure, but there are disadvantages: a booster pump needs to be installed in the raw brine pipe to realize the mechanical energy of the concentrated brine to the raw brine. Transmission of mechanical energy. Moreover, the motion position of the sliding piston cannot be sensed, so that the action of the...

AI Technical Summary

Problems solved by technology

China ZL01130627 discloses a valve-controlled residual pressure recovery device for a reverse osmosis desalination system. The device has a simple structure, but there are disadvantages: a booster pump needs to be installed in the raw brine pipe to realize the mechanical energy of the concentrated brine to the raw brine. transfer of mechanical energy

Moreover, the motion position of the sliding piston cannot be sensed, so that the action of the computer controller to control the solenoid valve cannot maintain a corresponding relationship with the motion position of the sliding piston, so high control accuracy cannot be achieved; in addition, although the residual pressure recovery efficiency of the device is limited Improved, but still not ideal

In addition, the current concentrated brine energy recovery devices generally have high production costs and low recovery efficiency

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