CN110563089A - High-pressure energy recovery device for reverse osmosis seawater desalination system - Google Patents
High-pressure energy recovery device for reverse osmosis seawater desalination system Download PDFInfo
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- CN110563089A CN110563089A CN201910715010.6A CN201910715010A CN110563089A CN 110563089 A CN110563089 A CN 110563089A CN 201910715010 A CN201910715010 A CN 201910715010A CN 110563089 A CN110563089 A CN 110563089A
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- 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
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- 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
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- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a high-pressure energy recovery device for a reverse osmosis seawater desalination system, which controls the movement of a piston and a piston rod assembly through high-pressure concentrated seawater from RO primary desalination equipment, when the piston and the piston rod assembly move to a position close to a limit position, a pilot valve is pushed to move, the pilot valve controls a reversing valve, and the reversing valve moves along with the pilot valve, so that the purpose that two hydraulic cylinders alternately carry out pressurization and pressure relief work is realized; the piston area of the closed seawater cavity is designed to be smaller than that of the closed high-pressure concentrated seawater, so that the original seawater is pressurized to the water supply pressure, and the purpose of self-pressurization is achieved; four check valves, two for each group, one group controls the entry of low-pressure raw seawater, and the other group controls the exit of pressurized seawater.
Description
Technical Field
The invention relates to a reverse osmosis seawater desalination system, in particular to a high-pressure energy recovery device for the reverse osmosis seawater desalination system.
Background
With the over-fishing and serious pollution in offshore areas, people have shifted their eyes to the deep sea, and marine ranches bear new hopes of Chinese fishery transformation, which also means that more and more fishing boats are driven to the deep blue under the large background of national strategy. However, the long-distance running fishing boat has long sailing time, fresh water is one of important factors for determining whether the boat can continuously sail, and the carrying of the water storage tank cannot ensure the quality of fresh water resources and has large floor area. The seawater desalination device is particularly important to be configured on the ship.
with the increasing maturity of reverse osmosis membrane technology, the demand of the sea fresh water machine market is rising year by year. The small reverse osmosis seawater desalination device faces a common problem, the energy consumption is far greater than that of a seawater desalination project, and the energy consumption per ton of water can reach 10-20 kWh. The high-pressure concentrated seawater in front of the reverse osmosis membrane cannot be well utilized and is wasted, and if the energy is utilized, the unit energy consumption of seawater desalination by the reverse osmosis membrane can be greatly reduced. Finding a proper high-pressure energy recovery device is the key for reducing the energy consumption of the small-sized seawater desalination device by the reverse osmosis membrane method.
Patent publication No.: CN102588240B discloses a self-pressurizing energy recovery pressure pump, wherein two pistons and a piston rod are arranged in an energy recovery device, and the contact area between the piston and a seawater cavity is larger than the contact area between high-pressure concentrated seawater and the piston, so that through the energy recovery device, the original seawater cannot reach the water supply pressure required by RO first-stage desalination equipment, and the water supply pressure required by a reverse osmosis membrane can be provided by further pressurizing with a medium-pressure pump, therefore, the self-pressurizing energy recovery pressure pump does not belong to pure mechanical pressurization, and has low energy recovery rate and needs to provide additional power. And the energy recovery device and the medium pressure pump work in a matched mode, the water supply pressure required by the reverse osmosis membrane cannot be provided at the beginning, and the system can work normally only after a certain time of slow accumulation.
disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a high-pressure energy recovery device for a reverse osmosis seawater desalination system, which reduces the energy consumption of unit produced water and improves the efficiency of seawater desalination by a reverse osmosis membrane method.
The technical scheme is as follows: the invention relates to a high-pressure energy recovery device for a reverse osmosis seawater desalination system, which comprises:
the central valve block is internally provided with a pilot valve channel which is used for placing a pilot valve, the central valve block is internally provided with a reversing valve channel which is used for placing a reversing valve, and the central valve block is internally provided with a plurality of flow channels; the end face of the central valve block is provided with a pretreated seawater inlet, a high-pressure concentrated seawater inlet, a pressure-relief concentrated seawater outlet and a high-pressure seawater outlet;
The device comprises a hydraulic cylinder A and a hydraulic cylinder B, wherein the hydraulic cylinder A and the hydraulic cylinder B are divided into 6 chambers by a piston assembly, and the hydraulic cylinder A is divided into a seawater chamber A, a transition chamber A and a concentrated water chamber A from left to right by the piston assembly in sequence; the piston assembly divides the hydraulic cylinder B into a seawater chamber B, a transition chamber B and a concentrated water chamber B from right to left in sequence;
the pilot valve is positioned between the concentrated water chamber A and the concentrated water chamber B, two ends of a valve rod of the pilot valve respectively extend to the concentrated water chamber A and the concentrated water chamber B, five holes are formed in a pilot valve channel, and the five holes are respectively an outflow hole I, an inflow and outflow hole II, an inflow hole III, an inflow and outflow hole IV and an outflow hole V from left to right; the first outflow hole is communicated with the seawater discharge outlet end to form a ninth channel, the fifth outflow hole is communicated with the seawater discharge outlet end to form a tenth channel, and the third inflow hole is communicated with the seawater inlet end to form a first channel.
The reversing valve channel is provided with a seawater hole I, a concentrated water hole II, a concentrated water hole III, a concentrated water hole IV, a concentrated water hole V, a concentrated water hole VI and a seawater hole VII from left to right respectively, wherein the seawater hole I is communicated with the pilot valve inflow and outflow hole II to form a second channel, the seawater hole VII is communicated with the pilot valve inflow and outflow hole IV to form a third channel, the concentrated water hole II is communicated with the pressure relief concentrated seawater outlet to form a seventh channel, the concentrated water hole VI is communicated with the pressure relief concentrated seawater outlet to form an eighth channel, the concentrated water hole III is communicated with the concentrated water cavity A to form a fourth channel, the concentrated water hole VI is communicated with the concentrated water cavity B to form a fifth channel, and the concentrated water hole IV is communicated with the high-pressure concentrated seawater inlet to form a sixth channel;
The central valve block is internally provided with a rectangular flow channel, and four top corners of the rectangular flow channel are sequentially provided with the check valve A, the check valve B, the check valve D and the check valve C anticlockwise; the seawater chamber A is communicated with a flow channel between the one-way valve A and the one-way valve C, and the seawater chamber B is communicated with a flow channel between the one-way valve B and the one-way valve D; the thrust required for pushing the check valve A and the check valve B away is smaller than the thrust required for pushing the check valve C and the check valve D away; the pretreated seawater flows to the seawater chamber A from the one-way valve A, the high-pressure seawater of the seawater chamber A flows to and opens the one-way valve C, the one-way valve A is closed, the pretreated seawater flows to the seawater chamber B from the one-way valve B, the high-pressure seawater of the seawater chamber B flows to and opens the one-way valve D, and the one-way valve B is closed.
By adopting the technical scheme, the high-pressure concentrated seawater controls the movement of the piston assembly, when the piston assembly moves to a position close to the limit position, the pilot valve is pushed to move, the pilot valve controls the reversing valve to reverse, the reversing valve also moves along with the reversing valve, and the purpose that the hydraulic cylinder A and the hydraulic cylinder B alternately carry out pressurization and pressure relief work is achieved; the check valve A and the check valve B control the entering of low-pressure raw seawater, and the check valve C and the check valve D control the outflow of pressurized seawater.
Has the advantages that: according to the invention, the high-pressure energy recovery device is designed to recover the pressure energy of the high-pressure concentrated seawater, so that most of the original seawater flows into the high-pressure energy recovery device, the seawater is pressurized to the water supply pressure, and a small part of the original seawater flows into the high-efficiency pressure pump, so that the energy consumption per ton of water of the small seawater desalination device is greatly reduced; all the components are skillfully matched, the energy of the high-pressure concentrated seawater is fully utilized, and the pure mechanical pressurization is adopted, so that part of the flow flowing into the reverse osmosis component is pressurized to the water supply pressure, and the reverse osmosis membrane desalination system is suitable for small reverse osmosis seawater desalination systems.
Drawings
FIG. 1 is a schematic view; a reverse osmosis seawater desalination system;
FIG. 2 is a schematic view; starting a state diagram of the primary energy recovery device;
FIG. 3 is a drawing; schematic diagram of the right-side pressurization and left-side pressure relief energy recovery device in the continuous working phase;
FIG. 4 is a drawing; schematic diagram of the left-side pressurization right-side pressure-relief energy recovery device in the continuous working phase.
Reference numerals: 1. a central valve block; 101. a piston rod bore; 102. a pretreated seawater inlet; 103. a high pressure concentrated seawater inlet; 104. a pressure-relief concentrated seawater outlet; 105. a high-pressure seawater outlet; 2. a hydraulic cylinder A; 201. a seawater chamber A; 202. a transition chamber; 203. a concentrated water chamber A; 3. a hydraulic cylinder B; 301. a seawater chamber B; 302. a transition chamber B; 303. a concentrated water chamber B; 4. a pilot valve; 401. a ninth channel; 402. a tenth channel; 403. a first channel; 5. a diverter valve; 501. a second channel; 502. a third channel; 503. a seventh channel; 504. an eighth channel; 505. a fourth channel; 506. a fifth channel; 507. a sixth channel; 6. a one-way valve A; 7. a check valve B; 8. a check valve C; 9. a check valve D; 10. a piston assembly; 1001. a piston A; 1002. a first piston rod; 1003. a piston B; 1004. a piston rod II; 1005. a piston C; 1006. a piston rod III; 1007. a piston D; 11. a dense water tank; 12. a pre-filter unit; 13. a reverse osmosis desalination unit; 1301. a pressure pump; 1302. RO primary desalination equipment; 14. a post-filtration unit; 15. pressure gauge A15; 16. pressure gauge B16; 17. pressure gauge C17.
Detailed Description
Referring to fig. 1, a reverse osmosis seawater desalination system includes a pre-filter unit 12, a reverse osmosis desalination unit 13, a post-filter unit 14, and a high pressure energy recovery device.
The high-pressure energy recovery device comprises a central valve block 1, a pilot valve 4, a reversing valve 5, a piston assembly 10, two hydraulic cylinders, a plurality of flow channels and 4 one-way valves.
As shown in fig. 2, in a center valve block 1, two side walls of the center valve block 1 are respectively connected with a hydraulic cylinder a2 and a hydraulic cylinder B3, piston assemblies 10 are respectively arranged in the hydraulic cylinder a2 and the hydraulic cylinder B3, a piston rod hole 101 is arranged in the center valve block 1, two ends of a piston rod of each piston assembly 10 respectively extend into the hydraulic cylinder a2 and the hydraulic cylinder B3, a rod body of each piston rod penetrates through the piston rod hole 101, a pilot valve channel is arranged below the center valve block 1 and used for placing a pilot valve 4, a reversing valve channel is arranged in the center valve block 1 and used for placing a reversing valve 5, and a plurality of flow channels are arranged in the center valve block 1; the end face of the central valve block 1 is provided with a pretreated seawater inlet 102, a high-pressure concentrated seawater inlet 103, a pressure-relief concentrated seawater outlet 104 and a high-pressure seawater outlet 105.
the device comprises a hydraulic cylinder A2 and a hydraulic cylinder B3, wherein the hydraulic cylinder A2 and the hydraulic cylinder B3 are divided into 6 chambers by a piston assembly 10, and the piston assembly 10 divides the hydraulic cylinder A2 into a seawater chamber A201, a transition chamber A202 and a concentrated water chamber A203 from left to right in sequence; the piston assembly 10 divides the hydraulic cylinder B3 into a seawater chamber B301, a transition chamber B302 and a concentrated water chamber B303 from right to left in sequence;
The piston assembly 10 comprises 4 pistons and 3 piston rods, the piston assembly 10 comprises a piston A1001, a piston rod I1002, a piston B1003, a piston rod II 1004, a piston C1005, a piston rod III 1006 and a piston D1007 which are sequentially arranged from left to right, the diameter of the piston A1001 is equal to that of the piston D1007, the diameter of the piston B1003 is equal to that of the piston C1005, and the diameters of the piston A1001 and the piston D1007 are smaller than those of the piston B1003 and the piston C1005. The left end of the piston A1001, the left end of the hydraulic cylinder A2 and the inner wall of the hydraulic cylinder A2 form a seawater chamber A201, the inner walls of the piston A1001, the piston rod I1002, the piston B1003 and the hydraulic cylinder A2 form a transition chamber A202, and the left sides of the piston B1003, the piston rod 21004, the central valve block 1 and the inner wall of the hydraulic cylinder A2 form a concentrated water chamber A203; the piston D1007, the right end of the hydraulic cylinder B3 and the inner wall of the hydraulic cylinder B3 form a seawater chamber B301, the piston D1007, the piston rod III 1006, the piston C1005 and the inner wall of the hydraulic cylinder B3 form a transition chamber B302, and the piston C1005, the piston rod II 1004, the right side of the central valve block and the inner wall of the hydraulic cylinder B3 form a concentrated water chamber B303.
the hydraulic cylinder A and the hydraulic cylinder B are identical in structure and symmetrically arranged on two sides of the central valve block 1.
The pilot valve 4 is positioned between the concentrated water chamber A203 and the concentrated water chamber B303, two ends of a valve rod of the pilot valve 4 respectively extend to the concentrated water chamber A203 and the concentrated water chamber B303, five holes are formed in a pilot valve channel, and the pilot valve channel respectively comprises an outflow hole I, an inflow outflow hole II, an inflow hole III, an inflow and outflow hole IV and an outflow hole V from left to right; the first outflow hole is communicated with the seawater discharge outlet end to form a ninth channel 401, the fifth outflow hole is communicated with the seawater discharge outlet end to form a tenth channel 402, and the third inflow hole is communicated with the seawater inlet end to form a first channel 403.
The reversing valve 5 is characterized in that a first seawater hole, a second concentrated water hole, a third concentrated water hole, a fourth concentrated water hole, a fifth concentrated water hole, a sixth concentrated water hole and a seventh seawater hole are respectively arranged on a channel of the reversing valve from left to right, wherein the first seawater hole is communicated with a second inflow and outflow hole of the pilot valve 4 to form a second channel 501, the seventh seawater hole is communicated with the fourth inflow and outflow hole of the pilot valve 4 to form a third channel 502, the second concentrated water hole is communicated with a pressure-relief concentrated seawater outlet 104 to form a seventh channel 503, the sixth concentrated water hole is communicated with the pressure-relief concentrated seawater outlet 104 to form an eighth channel 504, the third concentrated water hole is communicated with a concentrated water cavity A to form a fourth channel 505, the sixth concentrated water hole is communicated with a concentrated water cavity B to form a fifth channel 506, and the fourth concentrated water hole is communicated with a high-.
The central valve block 1 is internally provided with a rectangular flow passage, and the vertical side of the rectangular flow passage and four top corners of the rectangular flow passage are sequentially provided with a check valve A6, a check valve B7, a check valve D9 and a check valve C8 in a counterclockwise manner; the seawater chamber A201 is communicated with a flow channel between the one-way valve A6 and the one-way valve C8, and the seawater chamber B301 is communicated with a flow channel between the one-way valve B7 and the one-way valve D9; wherein the thrust required to push open check valve a6 and check valve B7 is less than the thrust required to push open check valve C8 and check valve D9; the pretreated seawater flows from check valve a6 to seawater chamber a201, the high pressure seawater in seawater chamber a201 flows to and opens check valve C8 and causes check valve a6 to close, the pretreated seawater flows from check valve B7 to seawater chamber B301, the high pressure seawater in seawater chamber B301 flows to and opens check valve D9 and causes check valve B7 to close.
It should be noted that in fig. 1-4, the rectangular flow channel is located outside the check valve, so as to facilitate the drawings to explain the working principle and the flow direction of the waterway of the present invention, in an actual product, the rectangular flow channel is located in the central valve block 1, the check valve is also located in the central valve block 1, and the pilot valve 4 and the reversing valve 5 are both located in the central valve block 1.
The pretreated seawater treated by the pre-filter unit 12 is desalted by the reverse osmosis desalination unit 13, the fresh water flowing out of the reverse osmosis desalination unit 13 flows into the post-filter unit 14, and the high-pressure concentrated seawater flowing out of the reverse osmosis desalination unit 13 flows into the high-pressure concentrated seawater inlet 103 of the energy recovery device.
as shown in fig. 1 and 2, the reverse osmosis desalination unit 13 comprises a pressure pump 1301 and an RO primary desalination device 1302, wherein an inlet of the pressure pump 1301 is connected in parallel with an inlet 102 of the pre-filtration unit 12 after treatment and pretreatment, an outlet of the pressure pump 1301 is connected in parallel with an outlet 105 of high-pressure seawater and an inlet of the RO primary desalination device 1302, an outlet of the RO primary desalination device 1302 is communicated with an outlet of the high-pressure seawater, and a fresh water outlet of the RO primary desalination device 1302 is communicated with a post-filtration unit 14.
In order to monitor the pressure of each part of the reverse osmosis desalination unit 13, a pressure gauge A15, a pressure gauge B16 and a pressure gauge C17 are arranged on the reverse osmosis desalination unit 13; pressure gauge A15 is used to monitor the pressure between the RO primary desalter 1302 inlet and the pressure pump 1301 outlet; pressure gauge B16 is used to monitor the pressure between the inlet of the RO primary desalter 1302 and the energy recovery device high pressure seawater outlet 105; pressure gauge C17 is used to monitor the pressure between the high pressure concentrated seawater outlet of the RO primary desalter 1302 and the energy recovery device high pressure concentrated seawater inlet 103.
The seawater desalination system is divided into a starting initial stage and a continuous working stage.
As shown in fig. 1-4, in the initial stage of starting, the pre-treated seawater flowing through the pre-filter unit 12 flows into the first channel 403, the valve rod of the pilot valve 4 is located at the rightmost side of the pore passage of the pilot valve 4, the first channel 403 is communicated with the third channel 502, the pre-treated seawater flowing out of the pre-filter unit 12 flows into the chamber at the right side of the reversing valve 5 along the first channel 403 and the third channel 502, the reversing valve 5 moves to the leftmost side, the second channel 501 of the reversing valve 5 is communicated with the ninth channel 401, the sixth channel 507 is communicated with the fourth channel 505, the fifth channel 506 is communicated with the eighth channel 504, the thrust of the pre-treated seawater opens the one-way valve a6 and the one-way valve B7 while the pre-treated seawater flows into the first channel, and the pre-treated seawater simultaneously flows into the seawater chamber a and. Meanwhile, the pretreated seawater flows into the pressure pump 1301 to be pressurized to the feed water pressure and then flows into the RO primary desalter 1302, the high-pressure concentrated seawater flowing out of the RO primary desalter 1302 flows into the fourth channel 505 along the sixth channel 507 and finally enters the concentrated water chamber A to push the piston assembly 10 to move leftwards, as the pretreated seawater in the seawater chamber A is pressurized to the feed water pressure and is larger than the pressure of the pretreated seawater, the high-pressure seawater pushes the check valve C8 away, the check valve A6 is closed, and meanwhile, the check valve B7 is still in an open state, the pretreated seawater flows into the seawater chamber B. When the piston assembly 10 moves to the left to the extreme position, the pilot valve 4 is triggered to move to the left to the leftmost end of the pilot valve channel, and the system enters a continuous working stage.
When the reverse osmosis seawater desalination system is in a continuous working stage, when the pilot valve 4 is at the leftmost end of a pore passage of the pilot valve 4, the first passage 403 is communicated with the second passage 501, the third passage 502 is communicated with the tenth passage 402, the pretreated seawater flows into a left side chamber of the reversing valve 5 along the first passage 403 and the second passage 501, the reversing valve 5 is pushed to move rightwards, the seawater in the right side chamber of the reversing valve 5 flows to the tenth passage 402 along the third passage 502, when the reversing valve 5 is pushed to the rightmost side, the sixth passage 507 is communicated with the fifth passage 506, the high-pressure concentrated seawater flows into the concentrated water chamber B303, the piston assembly 10 is pushed to move rightwards, the fourth passage 505 is communicated with the seventh passage 503, and the concentrated seawater after pressure relief is discharged from the concentrated water chamber A203. When the piston assembly 10 moves to the right, the pre-treated seawater in the seawater chamber B301 is pressurized to the feed water pressure, and since the feed water pressure is greater than the pre-treated seawater pressure, the high pressure seawater pushes open the check valve D9, the check valve B7 closes, and the high pressure seawater flows into the RO primary desalination device 1302. Meanwhile, the sum of the pressure in the seawater chamber A201 and the resistance of the one-way valve A6 is smaller than the thrust of the pretreated seawater, the one-way valve A6 is opened, the pretreated seawater flows into the seawater chamber A201, and the one-way valve C8 is closed because the thrust of the pretreated seawater is smaller than the resistance of the one-way valve C8. When the piston moves to the right to the limit position, the pilot valve 4 is triggered to move to the right to the rightmost end of the pilot valve channel.
When the pilot valve 4 is at the rightmost end of the pilot valve channel, the first channel 403 is communicated with the third channel 502, the second channel 501 is communicated with the ninth channel 401, the pretreated seawater flows into the right side chamber of the reversing valve 5 along the third channel 502 to push the reversing valve 5 to move leftwards, the pretreated seawater in the left side chamber of the reversing valve 5 flows to the ninth channel 401 along the second channel 501, when the reversing valve 5 is pushed to the leftmost side, the sixth channel 507 is communicated with the fourth channel 505, the high-pressure concentrated seawater flows into the concentrated water chamber A203 to push the piston assembly 10 to move leftwards, the fifth channel 506 is communicated with the eighth channel 504, and the decompressed concentrated seawater is discharged from the concentrated water chamber B303. When the piston assembly 10 moves to the right, the pre-treated seawater in the seawater chamber a201 is pressurized to the feed water pressure, and since the feed water pressure is greater than the pre-treated seawater pressure, the high pressure seawater pushes open the check valve C8, the check valve a6 closes, and the high pressure seawater flows into the RO primary desalter 1302. Meanwhile, the sum of the pressure in the seawater chamber B301 and the resistance of the check valve B7 is smaller than the thrust of the pretreated seawater, the check valve B7 is opened, the pretreated seawater flows into the seawater chamber B301, and the check valve D9 is closed because the thrust of the pretreated seawater is smaller than the resistance of the check valve D9. When the piston moves to the left to the extreme position, the pilot valve 4 is triggered to move to the left to the leftmost end of the pilot valve channel.
The pilot valves 4 are respectively reversed to the left and the right to complete a working cycle, and the hydraulic cylinder A2 and the hydraulic cylinder B3 alternately perform pressurization and pressure relief work in the cycle.
Claims (5)
1. A high pressure energy recovery device for a reverse osmosis seawater desalination system, comprising:
The hydraulic control valve comprises a central valve block (1), wherein two side walls of the central valve block (1) are respectively connected with a hydraulic cylinder A (2) and a hydraulic cylinder B (3), piston assemblies (10) are respectively arranged in the hydraulic cylinder A (2) and the hydraulic cylinder B (3), a piston rod hole (101) is formed in the central valve block (1), two ends of a piston rod of each piston assembly (10) respectively extend into the hydraulic cylinder A (2) and the hydraulic cylinder B (3), a rod body of each piston rod penetrates through the piston rod hole (101), a pilot valve channel is arranged below the central valve block (1) and used for placing a pilot valve (4), a reversing valve channel is arranged in the central valve block (1) and used for placing a reversing valve (5), and a plurality of flow channels are arranged in the central valve block (1); the end face of the central valve block (1) is provided with a pretreated seawater inlet (102), a high-pressure concentrated seawater inlet (103), a pressure-relief concentrated seawater outlet (104) and a high-pressure seawater outlet (105);
The device comprises a hydraulic cylinder A (2) and a hydraulic cylinder B (3), wherein the hydraulic cylinder A (2) and the hydraulic cylinder B (3) are divided into 6 chambers by a piston assembly (10), and the piston assembly (10) divides the hydraulic cylinder A (2) into a seawater chamber A (201), a transition chamber A (202) and a concentrated water chamber A (203) from left to right in sequence; the piston assembly (10) divides the hydraulic cylinder B (3) into a seawater chamber B (301), a transition chamber B (302) and a concentrated water chamber B (303) from right to left in sequence;
The pilot valve (4) is positioned between the concentrated water chamber A (203) and the concentrated water chamber B (303), two ends of a valve rod of the pilot valve (4) respectively extend to the concentrated water chamber A (203) and the concentrated water chamber B (303), five holes are formed in a channel of the pilot valve (4), and the five holes are respectively an outflow hole I, an inflow and outflow hole II, an inflow hole III, an inflow and outflow hole IV and an outflow hole V from left to right; the first outflow hole is communicated with a discharged seawater outlet end to form a ninth channel (401), the fifth outflow hole is communicated with a discharged seawater outlet end to form a tenth channel (402), and the third inflow hole is communicated with a seawater inlet end to form a first channel (403);
The reversing valve (5), the channel of the reversing valve (5) is respectively provided with a seawater hole I, a concentrated water hole II, a concentrated water hole III, a concentrated water hole IV, a concentrated water hole V, a concentrated water hole VI and a seawater hole VII from left to right, wherein the seawater hole I is communicated with the inflow and outflow hole II of the pilot valve (4) to form a second channel (501), the seawater hole VII is communicated with the inflow and outflow hole IV of the pilot valve (4) to form a third channel (502), the concentrated water hole II and a pressure-relief concentrated seawater outlet (104) form a seventh channel (503), the concentrated water hole VI and the pressure-relief concentrated seawater outlet (104) form an eighth channel (504), the concentrated water hole III is communicated with the concentrated water cavity A to form a fourth channel (505), the concentrated water hole VI is communicated with the concentrated water cavity B to form a fifth channel (506), and the concentrated water hole IV is communicated with the high-pressure concentrated seawater inlet (103) end to form a sixth;
the central valve block (1) is internally provided with a rectangular flow channel, and the vertical side of the rectangular flow channel and four top corners of the rectangular flow channel are sequentially provided with the check valve A (6), the check valve B (7), the check valve D (9) and the check valve C (8) in an anticlockwise mode; a seawater chamber A (201) is communicated with a flow channel between a one-way valve A (6) and a one-way valve C (8), and a seawater chamber B (301) is communicated with a flow channel between a one-way valve B (7) and a one-way valve D (9); the thrust required for pushing the check valve A (6) and the check valve B (7) away is smaller than the thrust required for pushing the check valve C (8) and the check valve D (9) away; the pretreated seawater flows from the check valve A (6) to the seawater chamber A (201), the high-pressure seawater of the seawater chamber A (201) flows to and opens the check valve C (8) and enables the check valve A (6) to be closed, the pretreated seawater flows from the check valve B (7) to the seawater chamber B (301), the high-pressure seawater of the seawater chamber B (301) flows to and opens the check valve D (9) and enables the check valve B (7) to be closed.
2. the high-pressure energy recovery device for the reverse osmosis seawater desalination system according to claim 1, wherein the piston assembly (10) comprises 4 pistons and 3 piston rods, the piston assembly (10) comprises a piston A (1001), a piston rod I (1002), a piston B (1003), a piston rod II (1004), a piston C (1005), a piston rod III (1006) and a piston D (1007) which are arranged from left to right in sequence, the diameter of the piston A (1001) is equal to that of the piston D (1007), the diameter of the piston B (1003) is equal to that of the piston C (1005), and the diameters of the piston A (1001) and the piston D (1007) are smaller than those of the piston B (1003) and the piston C (1005).
3. the high-pressure energy recovery device for the reverse osmosis seawater desalination system according to claim 1, wherein the piston A (1001), the left end of the hydraulic cylinder A (2) and the inner wall of the hydraulic cylinder A (2) form a seawater chamber A (201), the piston A (1001), the first piston rod (1002), the piston B (1003) and the inner wall of the hydraulic cylinder A (2) form a transition chamber A (202), and the piston B (1003), the piston rod 2(1004), the left side of the central valve block (1) and the inner wall of the hydraulic cylinder A (2) form a concentrated water chamber A (203); piston D (1007), hydraulic cylinder B (3) right-hand member and hydraulic cylinder B (3) inner wall form sea water cavity B (301), piston D (1007), piston rod three (1006), piston C (1005) and hydraulic cylinder B (3) inner wall form transition cavity B (302), and piston C (1005), piston rod 2(1004), the right side of central valve piece and hydraulic cylinder B (3) inner wall form dense water cavity B (303).
4. A high pressure energy recovery device for a reverse osmosis seawater desalination system according to claim 1, wherein the hydraulic cylinder B (3) and the hydraulic cylinder a (2) are symmetrically arranged at both sides of the central valve block (1).
5. A high pressure energy recovery device for a reverse osmosis seawater desalination system according to claim 1, characterized in that the high pressure seawater outlet (105) of the energy recovery device is communicated with a pressure pump (1301), the high pressure concentrated seawater inlet (103) of the energy recovery device is communicated with an RO primary desalination apparatus (1302), and the pressure-releasing concentrated seawater outlet (104) of the energy recovery device is communicated with a concentrated water tank (11).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910715010.6A CN110563089A (en) | 2019-08-05 | 2019-08-05 | High-pressure energy recovery device for reverse osmosis seawater desalination system |
| PCT/CN2019/122900 WO2021000516A1 (en) | 2019-07-02 | 2019-12-04 | Swro and mcdi coupled seawater desalination system with energy recovery |
| US17/251,177 US11339073B2 (en) | 2019-07-02 | 2019-12-04 | SWRO and MCDI coupled seawater desalination device system with energy recovery |
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| CN201910715010.6A CN110563089A (en) | 2019-08-05 | 2019-08-05 | High-pressure energy recovery device for reverse osmosis seawater desalination system |
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| CN110563089A true CN110563089A (en) | 2019-12-13 |
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