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Energy-saving reverse osmosis desalting process and device for seawater/brackish water

A process method, brackish water technology, applied in the direction of osmosis/dialysis water/sewage treatment, general water supply conservation, etc., can solve the problems of small water treatment volume of desalination device, increase system investment and operation complexity, etc., and achieve energy consumption in operation little effect

Inactive Publication Date: 2006-02-15
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the intermittent operation of the process and the limitation of the working volume of the reciprocating pump, the amount of water treated by the desalination device is small
Patent ZL00266242.6 provides a reverse osmosis device with a piston energy recovery device. The energy recovery device adopts the working principle of dual pistons with unequal areas, but due to the seawater flow Q 1 Discharge high-pressure concentrated brine flow Q with the membrane module 2 ranging from (Q 2 >Q 1 ), additional auxiliary equipment such as flow valves and regulating valves are required in the process operation, which increases the complexity of system investment and operation

Method used

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  • Energy-saving reverse osmosis desalting process and device for seawater/brackish water
  • Energy-saving reverse osmosis desalting process and device for seawater/brackish water
  • Energy-saving reverse osmosis desalting process and device for seawater/brackish water

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Embodiment Construction

[0017] The specific implementation manner of the patent of the present invention is described in conjunction with each accompanying drawing.

[0018] figure 1 It is the process flow chart of the reverse osmosis desalination unit. The pretreated seawater / brackish water in the pool 1 in the figure is pressurized by the water pump 2 and divided into two paths, one part of the seawater / brackish water flow E is pressurized by the high-pressure pump 3, and the other part of the seawater / brackish water flow A is The switching valve 7 of the energy recovery device 6 flows out through the interface a of the switching valve 7, a flow channel on the valve core, and the interface b, and enters the hydraulic cylinder 12, pushing the isolation piston 11 in the hydraulic cylinder 12 to move, and the isolation piston 11 moves to squeeze the brine on the other side of the isolation piston 11, so that it is discharged from the port b on the switching valve 10 at the other end of the hydraulic ...

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Abstract

The invention discloses an energy-saving reverse-osmosis desalination technique for seawater / salt water. Wherein, using lifting water pump to force some seawater / salt water into water cylinder by transfer valve to push piston and extrude strong brine on another side and discharge from another valve, and other seawater / salt water into reverse-osmosis membrane from high-pressure pump to discharge strong brine into another water cylinder and push piton to extrude seawater / salt water on another side into reverse-osmosis membrane from transfer valve and booster pump; adjusting and switching the operation of valves to realize desalination process. The said equipment also comprises energy-recovery device with transfer valves on two ends that composes of valve body, lining and valve core with two flow paths; there are four connection ports distributed evenly on the valve body and core. This method is flexible and reliable.

Description

technical field [0001] The invention relates to an energy-saving reverse osmosis seawater / brackish water desalination process method and device, belonging to the technical field of seawater desalination. Background technique [0002] Reverse osmosis is a pressure-driven membrane separation technology. Reverse osmosis seawater / brackish water desalination is the process of separating fresh water from seawater or brackish water under the action of high pressure by using the characteristics of reverse osmosis membrane. The separated fresh water is discharged as permeate, and the remaining concentrated seawater or brackish water is discharged as brine. Taking the seawater reverse osmosis desalination process as an example, the feed seawater usually needs to be pressurized to 5.5-8.0MPa, and the concentrated brine discharged from the membrane module also has a high pressure (>5.0MPa). Therefore, efficient recovery and utilization of residual pressu...

Claims

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Application Information

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IPC IPC(8): C02F1/44
CPCY02A20/131
Inventor 王世昌王越徐世昌余瑞霞孙家喜
Owner TIANJIN UNIV
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