Energy recoverer and method for increasing water yield of reverse osmosis sea water desalination device

Abstract

The invention discloses an energy recoverer and a method for increasing the water yield of a reverse osmosis sea water desalination device. According to the method, a pretreatment sea water pump pumps pretreated sea water in a sea water well into a sea water tank; low-pressure reverse osmosis desalination and high-pressure reverse osmosis desalination are performed step by step; a mechanical vibrator and compressed air are used for stirring sea water in a reverse osmosis membrane core, and when the reverse osmosis membrane core is blocked to certain extent, energy generated through backwash of the reverse osmosis membrane core is recovered with a reverse osmosis sea water desalination manner. For the reverse osmosis sea water desalination device adopting concentration polarization instead of energy recovery to discharge concentrated sea water timely, the concentrated sea water can be discharged timely according to the concentration polarization principle in the processes of low-pressure reverse osmosis desalination, high-pressure reverse osmosis desalination and backwash. After multiple times of backwash of the reverse osmosis membrane core, back blowing through is performed once on the reverse osmosis membrane core by a roots blower. The energy recoverer comprises a container, pistons, water inlet solenoid valves and water outlet solenoid valves.

Description

Technical field: [0001] The invention relates to an energy recovery device and a method for increasing the water yield of a reverse osmosis seawater desalination device. Background technique: [0002] At present, most of the high-pressure seawater pumps, reverse osmosis membranes, Dow reverse osmosis membrane cores and energy recovery devices in my country's reverse osmosis seawater desalination devices need to be imported, so the cost of reverse osmosis seawater desalination equipment is high. In addition, the reverse osmosis seawater desalination process outside is backward. To produce one ton of fresh water, it needs to discharge two tons of concentrated seawater, that is, it takes three tons of seawater to produce one ton of fresh water with a reverse osmosis seawater desalination device, and the fresh water yield is 33%. The technological process of reverse osmosis seawater desalination in my country is as follows: dig a seawater well on the beach by the sea, the seawat...

AI Technical Summary

Problems solved by technology

[0004] The present invention can change the defect of low yield of fresh water in the existing reverse osmosis seawater desalination

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