Sea water desalination boosting energy recovery device

Abstract

The invention relates to a sea water desalination boosting energy recovery device which comprises a first cylinder body, a second cylinder body and a third cylinder body, wherein the first cylinder body, the second cylinder body and the third cylinder body are coaxially connected, and a first piston, a second piston and a third piston are respectively arranged in the first cylinder body, the second cylinder body and the third cylinder body. The sea water desalination boosting energy recovery device further comprises a water inlet pump and a reverse osmosis membrane set, wherein the water inletpump is communicated with the first cylinder body and the third cylinder body through pipelines, and the first cylinder body and the third cylinder body are communicated with a water inlet of the reverse osmosis membrane set through pipelines. The sea water desalination boosting energy recovery device further comprises a first control valve, a third control valve, a second control valve and a fourth control valve, wherein the first control valve and the third control valve are arranged at one end of the second cylinder body, the second control valve and the fourth control valve are arranged at the other end of the second cylinder body, the first control valve and the second control valve are respectively communicated with a concentrated water opening of the reverse osmosis membrane set, corresponding cylinder bodies and externally draining pipelines of the corresponding cylinder bodies, and the third control valve and the fourth control valve are respectively communicated with pipe openings formed in inner walls of different partition plate ends of the second cylinder body, the water inlet pump and corresponding externally draining pipelines. The device has the advantages of goodenergy recovery effect, simple structure, ability in finishing internal boosting and an energy recovery process without external force, low cost and wide application range.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, in particular to a seawater desalination booster energy recovery device. Background technique [0002] With the rapid development of economy and the rapid growth and concentration of population, the demand for fresh water is also increasing. Although 2 / 3 of the earth's surface is covered by water, 97.2% of it is sea water, which cannot be used due to its high salt content. Direct use requires certain technical means to desalinate seawater, and the commonly used seawater desalination method is reverse osmosis. [0003] At present, the commonly used reverse osmosis seawater desalination system is equipped with an energy recovery device to recover the residual pressure energy of the concentrated brine. The energy recovery device makes the discharged high-pressure concentrated brine pass through the energy recovery device to pressurize part of the raw seawater. After the residual press...

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Problems solved by technology

[0003] At present, the commonly used reverse osmosis seawater desalination system is equipped with an energy recovery device to recover the residual pressure energy of the concentrated brine. The energy recovery device makes the discharged high-pressure concentrated brine pass through the energy recovery device to pressurize part of the raw seawater. After the residual pressure of brine, its pressure cannot reach the operating pressure of reverse osmosis, and a booster pump is required to increase the pressure of raw seawater, which is expensive and has a high one-time investment cost. The effect is inefficient or reduces the investment cost. The small and medium-sized reverse osmosis seawater desalination system cannot be equipped with an energy recovery device to cause energy waste. In the case of not relying on an external booster pump, the energy recovery efficiency is low and the effect is poor.

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