Reverse osmosis seawater desalination energy recovery device and switcher thereof

Abstract

The invention provides a reverse osmosis seawater desalination energy recovery device and a switcher thereof. The switcher comprises an outer cylinder body, an inner cylinder body, a piston rod, a driver, a high-pressure water inlet pipe head, two low-pressure water drain pipe heads and two hydraulic cylinder connecting pipe heads, wherein the outer cylinder body and the inner cylinder body are mutually sheathed, two outer chambers which are mutually isolated are formed between the outer cylinder body and the inner cylinder body, grating areas are respectively arranged at opposite parts of the inner cylinder body and the two outer chambers, the grating areas are provided with strip holes which are circumferentially distributed along the inner cylinder body and extend axially, and a set distance is axially kept between one ends of two adjacent strip holes on the same side; the piston rod is arranged in the inner cylinder body and two pistons are arranged on the piston rod; the driver is connected with one end of the piston rod to drive the piston rod to move in the inner cylinder body; the high-pressure water inlet pipe head is arranged between the two outer chambers and is communicated with the inner chamber of the inner cylinder body; the two low-pressure water drain pipe heads are arranged on the two sides of the two outer chambers; and the two hydraulic cylinder connecting pipe heads are arranged on the outer cylinder body, and each hydraulic cylinder connecting pipe head is correspondingly communicated with one outer chamber. The impact of seawater on the switcher during seawater desalination is reduced and the water inlet and outlet stability is improved.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, and more specifically relates to a reverse osmosis seawater desalination energy recovery device and a switcher thereof. Background technique [0002] Reverse osmosis seawater desalination technology is one of the mainstream technologies for seawater desalination. This technology needs to consume a lot of electric energy in the seawater desalination process (specifically through the pump) to increase the inlet water pressure to overcome the osmotic pressure of the water. The residual pressure of the concentrated seawater discharged by reverse osmosis is as high as 5.5~6.5MPa. If the system produces water with 40% recovery According to the calculated efficiency, the discharged concentrated seawater, which accounts for 60% of the influent, also contains high pressure energy. Recovering this part of energy into influent pressure energy can greatly reduce the energy consumption of revers...

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Problems solved by technology

[0006] In view of this, the present invention provides a reverse osmosis seawater desalination energy recovery device and its switcher. The technical solution provided by it improves the structure of the switcher to solve the problem that the energy recovery device in the background technology enters and exits during the working process. The impact of water on the piston of the switch is large, causing fast wear and vibration of the device, which improves the stability of water in and out

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