CN108557955B - Reverse osmosis sea water desalination energy recovery system and energy recovery method - Google Patents
Reverse osmosis sea water desalination energy recovery system and energy recovery method Download PDFInfo
- Publication number
- CN108557955B CN108557955B CN201810087452.6A CN201810087452A CN108557955B CN 108557955 B CN108557955 B CN 108557955B CN 201810087452 A CN201810087452 A CN 201810087452A CN 108557955 B CN108557955 B CN 108557955B
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- pressure
- reverse osmosis
- regulating valve
- plunger
- brine
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 54
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 239000013535 sea water Substances 0.000 title claims abstract description 24
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000012267 brine Substances 0.000 claims abstract description 50
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 50
- 239000012528 membrane Substances 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims description 24
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 description 4
- 238000011033 desalting Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/06—Energy recovery
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a reverse osmosis sea water desalination energy recovery system and an energy recovery method, and belongs to the technical field of sea water desalination. The reverse osmosis membrane pump comprises a plunger pump, wherein a water outlet of the plunger pump is connected with a first pressure regulating valve, the first pressure regulating valve is connected with a reverse osmosis membrane group, a high-pressure side of the reverse osmosis membrane group is connected with a first one-way valve, the first one-way valve is connected with a second pressure regulating valve, and the second pressure regulating valve is connected with a water inlet of the plunger pump. The invention can directly recycle the energy of the brine with pressure without adding external equipment, acts on the plunger, and achieves the effects of reducing input power and saving energy.
Description
Technical Field
The invention belongs to the technical field of sea water desalination, and relates to a reverse osmosis sea water desalination energy recovery system and an energy recovery method.
Background
The reverse osmosis membrane group has high pressure side and low pressure side, and the low pressure side is fresh water, and the high pressure side is brine, and brine has pressure, if direct emission just can cause the waste of high pressure side high pressure, namely the waste of energy, and the plunger pump is when doing the stroke of absorbing water, need open the check valve in the water inlet with the vacuum of the plunger in the pump, and this process needs to turn over the kinetic energy of plunger with the electric energy. The membrane method is used for desalting sea water, a large amount of brine sources with pressure are arranged, a large amount of energy sources are wasted due to direct discharge, and the sea water desalting cost is directly increased.
Disclosure of Invention
The invention aims to solve the problems and provide a reverse osmosis seawater desalination energy recovery system.
Another object of the invention is to provide a reverse osmosis desalination energy recovery method.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the reverse osmosis sea water desalination energy recovery system comprises a plunger pump, wherein a water outlet of the plunger pump is connected with a first pressure regulating valve, the first pressure regulating valve is connected with a reverse osmosis membrane group, a high-pressure side of the reverse osmosis membrane group is connected with a first one-way valve, the first one-way valve is connected with a second pressure regulating valve, and the second pressure regulating valve is connected with a water inlet of the plunger pump.
In the reverse osmosis seawater desalination energy recovery system, the low-pressure side of the reverse osmosis membrane group is connected with the brine-free receiver, and the brine receiver with pressure is arranged between the high-pressure side of the reverse osmosis membrane group and the first one-way valve.
In the reverse osmosis sea water desalination energy recovery system, the first pressure regulating valve and the second pressure regulating valve are respectively connected with overflow pipelines.
In the reverse osmosis sea water desalination energy recovery system, the second pressure regulating valve is also connected with an external brine source with pressure.
In the reverse osmosis seawater desalination energy recovery system, a second one-way valve is arranged between the second pressure regulating valve and an external brine source with pressure.
In the reverse osmosis seawater desalination energy recovery system, the plunger pump comprises a pump head pressure end connected with the water inlet, a plunger sliding bearing is arranged on the pump head pressure end, and a high-pressure sealing piece is arranged between the plunger sliding bearing and the pump head pressure end.
In the reverse osmosis sea water desalination energy recovery system, a plurality of high-pressure sealing pieces are arranged in a mutually clinging mode along the axial direction of the pressure end of the pump head.
The reverse osmosis sea water desalination energy recovering method includes the steps that a water outlet of a plunger pump is connected with a first pressure regulating valve, the first pressure regulating valve is connected with a reverse osmosis membrane group, a high pressure side of the reverse osmosis membrane group is connected with a first one-way valve, the first one-way valve is connected with a second pressure regulating valve, the second pressure regulating valve is connected with a water inlet of the plunger pump, an external pressurized brine source is further connected with the second pressure regulating valve, a second one-way valve is arranged between the second pressure regulating valve and the external pressurized brine source, raw water flow Q3 entering the water inlet from the second pressure regulating valve is regulated to be smaller than the sum of flow Q1 of the high pressure side of the reverse osmosis membrane group 4 and flow Q2 of the external pressurized brine source 11, and then the first pressure regulating valve is regulated to enable the pressure P1 of the first pressure regulating valve to be larger than the pressure P2 of the second pressure regulating valve, so that raw water pressure of the second pressure regulating valve directly acts on a plunger of the plunger pump to push the plunger to retreat.
In the reverse osmosis seawater desalination energy recovery method, the plunger pump comprises a pump head pressure end connected with the water inlet, a plunger sliding bearing is arranged on the pump head pressure end, and a high-pressure sealing piece is arranged between the plunger sliding bearing and the pump head pressure end.
In the reverse osmosis seawater desalination energy recovery method, the low pressure side of the reverse osmosis membrane group is connected with the brine receiver without salt, the brine receiver with pressure is arranged between the high pressure side of the reverse osmosis membrane group and the first one-way valve, the first pressure regulating valve and the second pressure regulating valve are respectively connected with the overflow pipeline, and the high pressure sealing parts are in a plurality and are mutually and closely arranged along the axial direction of the pressure end of the pump head.
Compared with the prior art, the invention has the advantages that:
1. the membrane method is characterized in that the brine under pressure is directly connected to a water inlet of a plunger pump, namely the energy recovery pump is connected to the rear part of the pressurized pipeline in series, when the plunger is in a water absorption stroke, the brine under pressure directly pushes a water inlet one-way valve and acts on the plunger to directly push the plunger to move backwards, and the brine under pressure is indirectly converted into rotary motion of a crankshaft, so that the input power is reduced, and the purposes of saving energy and reducing consumption are achieved without increasing equipment.
2. The high-pressure plunger pump structure is mainly a high-pressure sealing structure and a low-pressure sealing structure, wherein the front end of the low-pressure sealing structure is communicated with a water inlet pipeline of the water pump, that is, the water inlet cannot bear high pressure, so that the high-pressure plunger pump cannot be used as an energy recovery pump.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, a plunger pump 1, a water outlet 2, a first pressure regulating valve 3, a reverse osmosis membrane group 4, a first one-way valve 5, a second pressure regulating valve 6, a water inlet 7, a brine receiver 8, a brine receiver 9 with pressure, an overflow pipeline 10, an external brine source 11 with pressure, a second one-way valve 12, a pump head pressure end 13, a plunger sliding bearing 14 and a high-pressure sealing element 15.
Detailed Description
Example 1
As shown in fig. 1, the reverse osmosis seawater desalination energy recovery system comprises a plunger pump 1, wherein a water outlet 2 of the plunger pump 1 is connected with a first pressure regulating valve 3, the first pressure regulating valve 3 is connected with a reverse osmosis membrane group 4, a high-pressure side of the reverse osmosis membrane group 4 is connected with a first one-way valve 5, the first one-way valve 5 is connected with a second pressure regulating valve 6, and the second pressure regulating valve 6 is connected with a water inlet 7 of the plunger pump 1.
It should be understood by those skilled in the art that the reverse osmosis membrane set 4 is an OA membrane, the reverse osmosis membrane set 4 has a high pressure side and a low pressure side, the low pressure side is fresh water, the high pressure side is brine, the brine has pressure, if the brine is directly discharged, the waste of the high pressure side and the waste of energy can be caused, and when the plunger pump does a water suction stroke, the plunger pump needs to use the vacuum of the plunger in the pump to open the one-way valve in the water inlet, and the process needs to convert electric energy into the kinetic energy of the plunger.
Preferably, the low pressure side of the reverse osmosis membrane set 4 is connected with a brine-free receiver 8, the brine-free receiver 8 can be a pipeline, a storage tank and the like, a brine receiver 9 with pressure is arranged between the high pressure side of the reverse osmosis membrane set 4 and the first one-way valve 5, brine coming out of the high pressure side enters the brine receiver 9 with pressure to be stored, but in the brine receiver 9 with pressure, the brine is connected with the high pressure side of the reverse osmosis membrane set 4, that is, the brine in the brine receiver 9 with pressure also has high pressure, and the brine receiver 9 with pressure can be a pressure storage tank or a pressure pipeline.
The relief line 10 is connected to each of the first pressure regulating valve 3 and the second pressure regulating valve 6.
The second pressure regulating valve 6 is also connected with an external pressurized brine source 11, and the external pressurized brine source 11 can be seawater to be desalted, and is connected with the second pressure regulating valve 6 by a booster pump and has a certain pressure.
A second one-way valve 12 is provided between the second pressure regulating valve 6 and the external source of pressurized brine 11.
The plunger pump 1 comprises a pump head pressure end 13 connected to the water inlet 7, a plunger slide bearing 14 is arranged on the pump head pressure end, and a high-pressure sealing element 15 is arranged between the plunger slide bearing 14 and the pump head pressure end 13.
Most of the existing plunger pumps are high-pressure and low-pressure sealing structures, wherein the front end of the low-pressure sealing structure is communicated with the water inlet of the plunger pump, that is to say, the water inlet cannot bear high pressure, so that the water inlet can be difficult to use as an energy recovery pump, in the embodiment, after the plunger sliding bearing 14 and the high-pressure sealing element 15 are arranged at the pressure end of the pump head of the water inlet 7, the high-pressure sealing structure is adopted, the high pressure of the water inlet can be born without high-pressure sealing, and the pressure of brine with pressure can be directly connected, so that the pressure of the brine with pressure is recovered, and the stable and reliable operation of the plunger pump is ensured.
Preferably, the high-pressure sealing elements 15 are arranged in a plurality of mutually clinging manner along the axial direction of the pressure end 13 of the pump head.
The working principle of the invention is as follows:
The flow rate of the high-pressure side of the reverse osmosis membrane group 4 is set to be Q1, the flow rate of an external brine source 11 with pressure is set to be Q2, the flow rate of a water inlet 7 is set to be Q3, the overflow pipeline 10 of the second pressure regulating valve 6 is provided with partial overflow, so that Q1+ Q2 is slightly larger than Q3, the pressures of the first pressure regulating valve 3 and the second pressure regulating valve 6 are respectively P1 and P2, the flow rate of the P1 & gtP 2 and the flow rate of the Q3 enter the water inlet 7 to push a one-way valve in the water inlet 7 open, the pressure acts on a plunger to push the plunger to retreat, the input power is reduced, and the purposes of saving energy and reducing consumption are achieved without increasing equipment.
Example 2
The utility model provides a reverse osmosis sea water desalination energy recovery method, the delivery port 2 of plunger pump 1 connects first air-vent valve 3, and first air-vent valve 3 connects reverse osmosis membrane group 4, and reverse osmosis membrane group 4's high pressure side connects first check valve 5, and first check valve 5 connects second air-vent valve 6, and second air-vent valve 6 connects the water inlet 7 of plunger pump 1, second air-vent valve 6 still be connected with outside pressurized brine source 11, be equipped with second check valve 12 between second air-vent valve 6 and outside pressurized brine source 11, adjust the raw water flow Q3 that gets into the water inlet by the second air-vent valve and be less than reverse osmosis membrane group 4 high-pressure side flow Q1 and outside pressurized brine source 11's flow Q2 sum, readjust first air-vent valve, make first air-vent valve's pressure P1 be greater than second air-vent valve's pressure P2, make the raw water of second air-vent valve's pressure directly act on the plunger of plunger pump, promote the plunger to retreat, indirect conversion is the rotational motion of bent axle to reduce input power, reach energy saving and consumption reduction's effect when not increasing equipment.
Preferably, the plunger pump 1 comprises a pump head pressure end 13 connected with the water inlet 7, a plunger sliding bearing 14 is arranged on the pump head pressure end, a high-pressure sealing element 15 is arranged between the plunger sliding bearing 14 and the pump head pressure end 13, and a plurality of high-pressure sealing elements 15 are arranged in a mutually clinging mode along the axial direction of the pump head pressure end 13. Most of the existing plunger pumps are high-pressure and low-pressure sealing structures, wherein the front end of the low-pressure sealing structure is communicated with the water inlet of the plunger pump, that is to say, the water inlet cannot bear high pressure, so that the water inlet can be difficult to use as an energy recovery pump, in the embodiment, after the plunger sliding bearing 14 and the high-pressure sealing element 15 are arranged at the pressure end of the pump head of the water inlet 7, the high-pressure sealing structure is adopted, the high pressure of the water inlet can be born without high-pressure sealing, and the pressure of brine with pressure can be directly connected, so that the pressure of the brine with pressure is recovered, and the stable and reliable operation of the plunger pump is ensured.
More preferably, the low pressure side of the reverse osmosis membrane set 4 is connected with a brine-free receiver 8, the brine-free receiver 8 can be a pipeline, a storage tank or the like, a brine-under-pressure receiver 9 is arranged between the high pressure side of the reverse osmosis membrane set 4 and the first one-way valve 5, and brine coming out of the high pressure side enters the brine-under-pressure receiver 9 to be stored, but in the brine-under-pressure receiver 9, the brine is connected with the high pressure side of the reverse osmosis membrane set 4, that is, the brine in the brine-under-pressure receiver 9 also has high pressure, and the brine-under-pressure receiver 9 can be a pressure storage tank or a pressure pipeline. The first pressure regulating valve 3 and the second pressure regulating valve 6 are respectively connected with an overflow pipeline 10.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the terms plunger pump 1, water outlet 2, first pressure regulating valve 3, reverse osmosis membrane set 4, first one-way valve 5, second pressure regulating valve 6, water inlet 7, brine receiver 8, brine receiver 9 under pressure, overflow line 10, external brine source under pressure 11, second one-way valve 12, pump head pressure end 13, plunger slide bearing 14, high pressure seal 15 are used more herein, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the nature of the invention and should be construed in a manner consistent with their spirit and scope.
Claims (2)
1. The reverse osmosis seawater desalination energy recovery system comprises a plunger pump (1), and is characterized in that a water outlet (2) of the plunger pump (1) is connected with a first pressure regulating valve (3), the first pressure regulating valve (3) is connected with a reverse osmosis membrane group (4), the high pressure side of the reverse osmosis membrane group (4) is connected with a first one-way valve (5), the first one-way valve (5) is connected with a second pressure regulating valve (6), the second pressure regulating valve (6) is connected with a water inlet (7) of the plunger pump (1),
The plunger pump (1) comprises a pump head pressure end (13) connected with the water inlet (7), a plunger sliding bearing (14) is arranged on the pump head pressure end, a high-pressure sealing element (15) is arranged between the plunger sliding bearing (14) and the pump head pressure end (13),
A brine receiver (9) with pressure is arranged between the high-pressure side of the reverse osmosis membrane group (4) and the first one-way valve (5),
The first pressure regulating valve (3) and the second pressure regulating valve (6) are respectively connected with an overflow pipeline (10),
The second pressure regulating valve (6) is also connected with an external brine source (11) with pressure,
A second one-way valve (12) is arranged between the second pressure regulating valve (6) and an external brine source (11) with pressure,
The high-pressure sealing elements (15) are arranged in a plurality of mutually clinging way along the axial direction of the pressure end (13) of the pump head,
The high-pressure side brine of the reverse osmosis membrane group (4) is used as a power source and is connected with the water inlet (7), pressure is directly acted on the one-way valve in the water inlet (7), the one-way valve is pushed open, the pressure is acted on the plunger, the plunger is pushed to move backwards, and the pressure is indirectly converted into rotary motion of the crankshaft.
2. Reverse osmosis seawater desalination energy recovery system according to claim 1, characterized in that the low pressure side of the reverse osmosis membrane stack (4) is connected to a brine-free receiver (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810087452.6A CN108557955B (en) | 2018-01-30 | 2018-01-30 | Reverse osmosis sea water desalination energy recovery system and energy recovery method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810087452.6A CN108557955B (en) | 2018-01-30 | 2018-01-30 | Reverse osmosis sea water desalination energy recovery system and energy recovery method |
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| Publication Number | Publication Date |
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| CN108557955A CN108557955A (en) | 2018-09-21 |
| CN108557955B true CN108557955B (en) | 2024-04-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913716A (en) * | 2010-07-20 | 2010-12-15 | 国家***天津海水淡化与综合利用研究所 | Small reverse osmosis seawater desalting system with energy reclaiming high-pressure pump |
| CN204529533U (en) * | 2015-03-24 | 2015-08-05 | 中国电建集团华东勘测设计研究院有限公司 | A kind of reverse osmosis seawater desalination system |
| CN206289097U (en) * | 2016-12-22 | 2017-06-30 | 重庆市沃利克环保设备有限公司 | Reverse osmosis seawater desalination system |
| CN208249949U (en) * | 2018-01-30 | 2018-12-18 | 浙江大农实业股份有限公司 | Reverse osmosis seawater desalting energy recycling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5562884B2 (en) * | 2011-03-15 | 2014-07-30 | 株式会社東芝 | Seawater desalination equipment |
-
2018
- 2018-01-30 CN CN201810087452.6A patent/CN108557955B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913716A (en) * | 2010-07-20 | 2010-12-15 | 国家***天津海水淡化与综合利用研究所 | Small reverse osmosis seawater desalting system with energy reclaiming high-pressure pump |
| CN204529533U (en) * | 2015-03-24 | 2015-08-05 | 中国电建集团华东勘测设计研究院有限公司 | A kind of reverse osmosis seawater desalination system |
| CN206289097U (en) * | 2016-12-22 | 2017-06-30 | 重庆市沃利克环保设备有限公司 | Reverse osmosis seawater desalination system |
| CN208249949U (en) * | 2018-01-30 | 2018-12-18 | 浙江大农实业股份有限公司 | Reverse osmosis seawater desalting energy recycling system |
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