CN111217426B - Energy recovery system in seawater desalination and control method thereof - Google Patents
Energy recovery system in seawater desalination and control method thereof Download PDFInfo
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- CN111217426B CN111217426B CN202010088305.8A CN202010088305A CN111217426B CN 111217426 B CN111217426 B CN 111217426B CN 202010088305 A CN202010088305 A CN 202010088305A CN 111217426 B CN111217426 B CN 111217426B
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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
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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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
- C02F2303/14—Maintenance of water treatment installations
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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
Abstract
The invention discloses an energy recovery system in seawater desalination and a control method thereof. The control method of the energy recovery system in the seawater desalination comprises the following steps: the seawater pumped by the booster pump is sent into the seawater tank through the booster seawater electric valve. The seawater is discharged from the seawater tank and enters the reverse osmosis membrane core through the seawater outlet electric valve for seawater desalination. The compressed air from the air storage tank enters a pressurized seawater tank. Carrying out backwashing for one time after pressurizing for a plurality of times: compressed air in the seawater tanks of the backwashing group enters the energy recovery main pipe through the energy recovery electric valve and enters the seawater tanks of the backwashing group through the energy recovery electric valve of the energy recovery group. Compressed air in the air storage tank enters a fresh water area of the reverse osmosis membrane core, and the compressed air and the fresh water pass through the reverse osmosis membrane for back washing. Back flushing is carried out for one time after back flushing for several times: discharging fresh water and concentrated seawater in the reverse osmosis membrane core, discharging concentrated seawater in the seawater tank, and then reversely blowing the reverse osmosis membrane core by using compressed air in the seawater tank.
Description
The technical field is as follows:
the invention relates to an energy recovery system in seawater desalination and a control method thereof.
Background art:
the invention has the patent numbers: 201510091697.2, patent name of invention: the energy recoverer in the energy recoverer and the method for improving the water yield of the reverse osmosis seawater desalination device is a process that fresh water passes through a reverse osmosis membrane to flush the reverse osmosis membrane when a reverse osmosis membrane core is backwashed, and pressure is applied to concentrated seawater in the reverse osmosis membrane core, the concentrated seawater in the reverse osmosis membrane core improves the energy of the energy seawater recoverer to apply pressure to new seawater filled in the reverse osmosis membrane core after back flushing, so that seawater is desalinated, and the energy of the back flushing is recovered. The energy of the back washing is too little, and only the concentrated seawater is recycled; therefore, energy recovery should not be called.
The existing reverse osmosis seawater desalination process comprises the following steps: pumping the pretreated piston into a reverse osmosis membrane core by a booster pump, wherein the pressure of the booster pump is below 5 kilograms, fresh water molecules in the reverse osmosis membrane core pass through the reverse osmosis membrane under the pressure of 5 kilograms to reach a fresh water area, and the reverse osmosis membrane is blocked after a plurality of minutes, so that the flow of seawater entering the reverse osmosis membrane core is reduced. Closing the electromagnetic pressure increasing valve of the reverse osmosis membrane core, opening the electromagnetic high-pressure valve, and pumping the piston after pretreatment into the reverse osmosis membrane core by the high-pressure pump. The pressure of the high-pressure pump reaches 20 kilograms, fresh water molecules in the reverse osmosis membrane core pass through the reverse osmosis membrane to reach a fresh water area under the pressure of 20 kilograms, the reverse osmosis membrane is seriously blocked after a plurality of minutes, the flow of seawater entering the reverse osmosis membrane core is reduced, and the reverse osmosis membrane core needs to be backwashed once. The high-pressure pump for reverse osmosis seawater desalination in developed countries is a centrifugal pump, but the high-pressure centrifugal pump in China does not reach 201 kg of pressure, and only a plunger pump is used for replacing the high-pressure centrifugal pump, but the efficiency of the plunger pump is too low.
The invention content is as follows:
the invention relates to an energy recovery system in seawater desalination. The pretreated seawater is filled in the seawater pool, the water inlet pipe of the booster pump is placed in the seawater pool, the water outlet pipe of the booster pump is divided into a plurality of groups of branch water outlet pipes, and each group of branch water outlet pipe is connected to each group of seawater tanks through each group of booster seawater electric valves. Each seawater tank is provided with a water level sensor, and the top of each seawater tank is provided with a pressure sensor. The pipelines connected from the bottom of each seawater tank are sequentially connected to the seawater area of the group of reverse osmosis membrane cores through a flow sensor and a seawater outlet electric valve, ten reverse osmosis membrane cores are in one group, and the concentrated seawater pipes connected from the seawater area of each group of reverse osmosis membrane cores are gathered together and then connected to a concentrated seawater pool through a concentrated seawater electric valve. The fresh water pipes connected from the fresh water areas of the reverse osmosis membrane cores are collected together and then connected to the fresh water pool through the fresh water electric valves. An air pipe connected from the air compressor is connected to an air storage tank through a one-way air valve, and the air storage tank is provided with a pressure sensor. And the back-flushing branch gas pipes connected from the gas storage tank are connected to the fresh water areas of the reverse osmosis membrane cores through the back-flushing electric gas valves of the groups. The pressurized branch gas pipe connected from the gas storage tank is connected to the top of each group of seawater tanks through each group of pressurized electric gas valves. The energy recovery branch gas pipes connected from the top of the seawater tank are collected to the energy recovery main pipe after passing through each group of energy recovery electric air valves, and the back-blowing branch gas pipes connected from the energy recovery main pipe are connected to the fresh water areas of each group of reverse osmosis membrane cores through each group of back-blowing electric air valves.
The control method of the energy recovery system in the seawater desalination comprises the following steps: the air compressor is started, compressed air from the air compressor enters the air storage tank through the one-way air valve, when the air pressure of the air storage tank reaches 2.8MPa, the computer control instrument stops the electricity of the air compressor, the one-way air valve can prevent the compressed air in the air storage tank from being pressed into the air compressor, and when the air pressure of the air storage tank is lower than 2.5MPa, the air compressor is restarted. The seawater is sent to a seawater pool after being pretreated, and the seawater in the seawater pool is pumped out by the booster pump and then sent to each group of seawater tanks through each group of booster seawater electric valves. And opening each group of seawater outlet electric valves and each group of fresh water electric valves, wherein the seawater flows out of the bottom of each seawater tank and then sequentially enters the seawater area of the group of reverse osmosis membrane cores through the flow sensor and the opened seawater outlet electric valves, fresh water molecules pass through the reverse osmosis membranes to enter the fresh water area, and the fresh water flowing out of each group of reverse osmosis membrane cores and the fresh water are gathered together and then flow to the fresh water pool through each group of opened fresh water electric valves. The air pressure and the water level of each group of seawater tanks are continuously raised, when the seawater in a certain seawater tank reaches a high water level, a water level sensor arranged on the seawater tank sends a signal, and the computer control instrument closes the group of pressurized seawater electric valves. The computer control instrument selects a group of reverse osmosis membrane cores, opens the group of pressurizing electric air valves, compressed air from the air storage tank enters the pressurizing group seawater tank through the opened pressurizing electric air valves of the pressurizing group, closes the group of pressurizing electric air valves when the air pressure in the seawater tank reaches 1.8MPa, and reopens the group of pressurizing electric air valves when the air pressure in the seawater tank is lower than 1.5 MPa. After the times are repeatedly set, performing back washing on the reverse osmosis membrane core for one time: the computer control instrument closes the back washing group fresh water electric valve, and opens the back washing group energy recovery electric valve and the back washing electric valve. The computer control instrument selects a group of reverse osmosis membrane cores as an energy recovery group, and an energy recovery electric valve of the energy recovery group is opened. Compressed air with the pressure of 1.8MPa in the seawater tank of the back washing group enters the energy recovery main pipe through opening the energy recovery electric valve, and then enters the seawater tank through the opened energy recovery electric valve of the energy recovery group. Compressed air with the pressure of more than 2.5MPa in the air storage tank enters a reverse osmosis membrane core fresh water area of the reverse osmosis unit through an opened reverse osmosis electric air valve of the reverse osmosis unit, passes through a reverse osmosis membrane together with fresh water to reach a seawater area to carry out reverse osmosis on the reverse osmosis membrane, and then enters the seawater tank through an opened reverse osmosis unit seawater outlet electric valve. After the backwashing time reaches the set time, the computer control instrument closes the energy recovery electric valve of the energy recovery receiving set, the energy recovery electric valve of the backwashing set and the backwashing electric air valve; then the computer control instrument opens the pressurizing electric air valve and the fresh water electric valve of the back washing group. Compressed air in the air storage tank reenters the group of seawater tanks through the opened group of pressurizing electric air valves, the air pressure in the group of seawater tanks is increased, more freshwater molecules pass through the reverse osmosis membranes of the group of reverse osmosis membrane cores to enter a freshwater area, and the flow of seawater outlet water of the group of seawater tanks is increased. When the flow of the water discharged from the group of seawater tanks reaches a set high flow, the group of flow sensors sends a high flow signal, the computer control instrument closes the group of pressurizing electric air valves, and the computer control instrument reopens the group of pressurizing electric air valves until the flow of the water discharged from the group of seawater tanks is reduced to a set bottom flow. Compressed air in the air storage tank enters the group of seawater tanks through the opened group of pressurizing electric air valves, the air pressure in the group of seawater tanks is increased, and the operation is repeated for many times until the air pressure in the group of seawater tanks is increased to 1.8MPa, and then back washing is carried out again. The sea water in this group of sea water pitcher reduces to setting for the low water level after the back flush is several times, and the water level sensor that this group of sea water pitcher was equipped with sends low water level signal, carries out a blowback to this group of reverse osmosis membrane core and leads to: the computer control instrument closes the back-flushing group pressurizing electromagnetic air valve and the fresh water electric valve and then opens the concentrated seawater electric valve and the back-flushing electric air valve of the back-flushing group. The concentrated seawater in the back flushing group seawater tank flows into the concentrated seawater pool through the opened seawater outlet electric valve and the concentrated seawater electric valve. Compressed air with pressure of more than 2.5MPa in the air storage tank enters a fresh water area of a reverse osmosis membrane core of the back flushing group through the back flushing electric air valve of the opened back flushing group, passes through the reverse osmosis membrane together with fresh water to reach a seawater area to back flush the reverse osmosis membrane, and concentrated seawater in the seawater area of the reverse osmosis membrane core of the back flushing group flows into a concentrated seawater pool through the opened concentrated seawater electric air valve under the pressure of the compressed air. The concentrated seawater in the back-flushing group seawater tank completely flows out, a water level sensor arranged in the back-flushing group seawater tank sends a signal, and the computer control instrument closes the seawater outlet electric valve of the back-flushing group. And after the opening time of the back-flushing electric air valve of the back-flushing group reaches a set value, the computer controller closes the back-flushing electric air valve of the back-flushing group, then opens the fresh water electric valve of the back-flushing group, and fresh water in the fresh water area of the reverse osmosis membrane core of the back-flushing group flows into the fresh water tank through the opened fresh water electric valve under the pressure of the residual compressed air. After the opening time of the fresh water electric valve of the back flushing group reaches a set value and fresh water in the fresh water area of the reverse osmosis membrane core of the back flushing group is exhausted, the computer controller closes the fresh water electric valve of the back flushing group and then opens the energy recovery electric valve and the back flushing electric valve of the back flushing group. Compressed air in the back flushing group seawater tank enters an energy recovery main pipe through an energy recovery electric valve of an opened back flushing group, the compressed air in the energy recovery main pipe enters a fresh water area of a reverse osmosis membrane core of the back flushing group through a back flushing electric air valve of the opened back flushing group, then passes through a reverse osmosis membrane of the reverse osmosis membrane core of the back flushing group to enter a seawater area, and blows through the reverse osmosis membrane of the reverse osmosis membrane core of the back flushing group. Compressed air in the seawater tank of the back flushing group is exhausted, pressure sensors arranged at the top of the seawater tank of the back flushing group send signals, the computer controller closes the concentrated seawater electric valve of the back flushing group, the energy recovery electric valve of the back flushing group and the back flushing electric valve, and then opens the fresh water electric valve of the back flushing group, the pressurized seawater electric valve of the back flushing group and the seawater outlet electric valve of the back flushing group. Seawater coming out of the booster pump is sent into a seawater tank of the back flushing group through a seawater pressing electric valve of the back flushing group, seawater coming out of the bottom of the seawater tank of the back flushing group sequentially passes through a flow sensor and a seawater outlet electric valve of the opened back flushing group to enter a seawater area of a reverse osmosis membrane core of the back flushing group, fresh water molecules pass through the reverse osmosis membrane to enter a fresh water area, and fresh water flowing out of the reverse osmosis membrane core fresh water area of the back flushing group is gathered together and then flows to the fresh water pool through the fresh water electric valves of the opened back flushing groups. After the seawater tank of the energy recovery group receives the set times of energy recovery, the computer control instrument opens the pressurization electric air valve of the energy recovery group, and compressed air from the air storage tank enters the seawater tank of the energy recovery group through the opened pressurization electric air valve of the energy recovery group. When the air pressure in the seawater tank reaches 1.8MPa, the computer control instrument closes the group of pressurizing electric air valves, when the air pressure in the seawater tank is lower than 1.5MPa, the computer control instrument reopens the group of pressurizing electric air valves, and after the above steps are repeated for a set number of times, the reverse osmosis membrane core is subjected to one-time back washing.
The invention omits a Roots blower which is commonly used for reverse osmosis seawater desalination and back flushing and a high-pressure centrifugal water pump with the pressure of 30 kilograms. The roots blower is easy to break down, and the roots blower can be stuck only by a little dust. The high-pressure centrifugal water pump with 30 kg of pressure cannot be produced in China, and the high-pressure centrifugal water pump with 30 kg of pressure at the inlet is very high in price. The reciprocating piston air compressor used by the invention has high efficiency and is not easy to break down.
Description of the drawings:
the present invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic structural diagram of an energy recovery system in seawater desalination of the present invention.
The specific implementation mode is as follows:
fig. 1 shows an energy recovery system in seawater desalination. The pretreated seawater is filled in the seawater pool 7, the water inlet pipe of the booster pump 4 is placed in the seawater pool 7, the water outlet pipe of the booster pump 4 is divided into a plurality of groups of branch water outlet pipes, and each branch water pipe is connected to each group of seawater tanks 5 through each group of booster seawater electric valves 15. Each seawater tank 5 is provided with a water level sensor, and the top of each seawater tank 5 is provided with a pressure sensor. The pipeline connected from the bottom of each seawater tank 5 is connected to the seawater area of the group of reverse osmosis membrane cores 6 through a flow sensor and a seawater outlet electric valve 16 in sequence, ten reverse osmosis membrane cores 6 are in one group, and the concentrated seawater pipes connected from the seawater area of each group of reverse osmosis membrane cores 6 are collected together and then connected to a concentrated seawater pool 9 through a concentrated seawater electric valve 18. The fresh water pipes connected from the fresh water areas of the reverse osmosis membrane cores 6 are collected together and then are connected to the fresh water pool 8 through the fresh water electric valves 17. An air pipe connected from the air compressor 1 is connected to the air storage tank 2 through the one-way air valve 10, and the air storage tank 2 is provided with a pressure sensor. The back-flushing branch gas pipes connected from the gas storage tank 2 are connected to the fresh water areas of the reverse osmosis membrane cores 6 through the back-flushing electric air valves 12 of the groups respectively. The pressurized branch gas pipe connected from the gas storage tank 2 is connected to the top of each group of seawater tanks 5 through each group of pressurized electric gas valves 11. The energy recovery branch gas pipes connected from the top of the seawater tank 5 are collected to the energy recovery main pipe 3 after passing through each group of energy recovery electric air valves 13, and the back-blowing branch gas pipes connected from the energy recovery main pipe 3 are connected to the fresh water areas of each group of reverse osmosis membrane cores 6 through each group of back-blowing electric air valves 14.
Fig. 1 shows a control method of an energy recovery system in seawater desalination: the air compressor 1 is started, compressed air coming out of the air compressor 1 enters the air storage tank 2 through the one-way air valve 10, when the air pressure of the air storage tank 2 reaches 2.8MPa, the computer control instrument stops the electricity of the air compressor 1, the one-way air valve 10 can prevent the compressed air in the air storage tank 2 from being pressed into the air compressor 1, and when the air pressure of the air storage tank 2 is lower than 2.5MPa, the air compressor 1 is restarted. The seawater is sent to a seawater pool 7 after being pretreated, and the seawater in the seawater pool 7 is pumped out by a booster pump 4 and then sent to each group of seawater tanks 5 through each group of booster seawater electric valves 15. The seawater outlet electric valves 16 and the fresh water outlet electric valves 17 are opened, seawater flows out from the bottom of each seawater tank 5 and then sequentially enters the seawater area of the reverse osmosis membrane core 6 through the flow sensor and the opened seawater outlet electric valves 16, fresh water molecules pass through the reverse osmosis membranes and enter the fresh water area, and fresh water flowing out of the fresh water area of the reverse osmosis membrane core 6 is gathered together and then flows to the fresh water pool 8 through the opened fresh water electric valves 17. The air pressure and the water level of each group of seawater tanks 5 are continuously raised, when the seawater in a certain seawater tank 5 reaches a high water level, a water level sensor arranged on the seawater tank 5 sends a signal, and the computer control instrument closes the group of pressurized seawater electric valves 15. The computer control instrument selects a group of reverse osmosis membrane cores 6, opens the group of pressurizing electric air valves 11, compressed air from the air storage tank 2 enters the pressurizing group seawater tank 5 through the opened pressurizing group pressurizing electric air valves 11, closes the group of pressurizing electric air valves 11 when the air pressure in the seawater tank 5 reaches 1.8MPa, and reopens the group of pressurizing electric air valves 11 when the air pressure in the seawater tank 5 is lower than 1.5 MPa. After the times are repeatedly set, the reverse osmosis membrane core 6 is back flushed for one time: the computer control instrument closes the back washing set fresh water electric valve 17, and opens the back washing set energy recovery electric valve 13 and the back washing electric valve 12. The computer control instrument selects a group of reverse osmosis membrane cores 6 as an energy recovery group, and an energy recovery motor 13 of the energy recovery group is turned on. Compressed air with the pressure of 1.8MPa in the seawater tank 5 of the back washing group enters the energy recovery main pipe 3 through opening the energy recovery electric valve 13, and then enters the seawater tank 5 through the opened energy recovery electric valve 13 of the energy recovery group. Compressed air with pressure of more than 2.5MPa in the air storage tank 2 enters a fresh water area of a reverse osmosis membrane core 6 of the back washing group through an opened back washing electric air valve 12 of the back washing group, passes through the reverse osmosis membrane together with fresh water to reach a seawater area to back wash the reverse osmosis membrane, and then enters a seawater tank 5 of the group through an opened back washing group seawater outlet electric valve 16. After the backwashing time reaches the set time, the computer control instrument closes the energy recovery electric valve 13 of the energy recovery receiving set, the energy recovery electric valve 13 of the backwashing set and the backwashing electric air valve 12; then the computer control instrument opens the back washing group pressurizing electric air valve 11 and the fresh water electric valve 17. Compressed air in the air storage tank 2 reenters the seawater tank 5 through the opened group of pressurizing electric air valves 11, the air pressure in the seawater tank 5 is increased, more freshwater molecules pass through the reverse osmosis membrane of the reverse osmosis membrane core 6 to enter a freshwater area, and the flow of seawater outlet water of the seawater tank 5 is increased. When the flow of the effluent of the group of seawater tanks 5 reaches a set high flow, the group of flow sensors sends a high flow signal, the computer control instrument closes the group of pressurizing electric air valves 11, and the computer control instrument reopens the group of pressurizing electric air valves 11 until the flow of the effluent of the group of seawater tanks 5 is reduced to a set bottom flow. Compressed air in the air storage tank 2 enters the seawater tank 5 through the opened group of pressurizing electric air valves, the air pressure in the seawater tank 5 is increased, and the operation is repeated for many times until the air pressure in the seawater tank 5 is increased to 1.8MPa, and then backwashing is carried out again. After backwashing for several times, the seawater in the seawater tank 5 is reduced to a set low water level, a water level sensor arranged in the seawater tank 5 sends a low water level signal, and the reverse osmosis membrane core 6 is subjected to back flushing for one time: the computer control instrument closes the back-flushing group pressurizing electromagnetic air valve 11 and the fresh water electric valve 17, and then opens the back-flushing group concentrated seawater electric valve 18 and the back-flushing electric air valve 12. The concentrated seawater in the seawater tank 5 of the back flushing group flows into the concentrated seawater pool 9 through the opened seawater outlet electric valve 16 and the concentrated seawater electric valve 18. Compressed air with pressure over 2.5Mpa in the air storage tank 2 enters a fresh water area of a reverse osmosis membrane core 6 of the back flushing unit through a back flushing electric air valve 12 of the back flushing unit which is opened, and the compressed air and the fresh water pass through the reverse osmosis membrane together to reach a seawater area to back flush the reverse osmosis membrane, and concentrated seawater in the seawater area of the reverse osmosis membrane core 6 of the back flushing unit flows into a concentrated seawater pool 9 through an opened concentrated seawater electric valve 18 under the pressure of the compressed air. The concentrated seawater in the seawater tank 5 of the back flushing group flows out, a water level sensor arranged in the seawater tank 5 of the back flushing group sends out a signal, and the computer controller closes the seawater outlet electric valve 16 of the back flushing group. After the opening time of the back flushing electric air valve 12 of the back flushing group reaches a set value, the computer control instrument closes the back flushing electric air valve 12 of the back flushing group, then opens the fresh water electric valve 17 of the back flushing group, and fresh water in the fresh water area of the reverse osmosis membrane core 6 of the back flushing group flows into the fresh water pool 8 through the opened fresh water electric valve 17 under the pressure of residual compressed air. After the opening time of the fresh water electric valve 17 of the back flushing group reaches a set value and fresh water in the fresh water area of the reverse osmosis membrane core 6 of the back flushing group is exhausted, the computer controller closes the fresh water electric valve 17 of the back flushing group and then opens the energy recovery electric valve 13 and the back flushing electric air valve 14 of the back flushing group. Compressed air in the reverse blowing group seawater tank 5 enters the energy recovery header pipe 3 through the opened reverse blowing group energy recovery electric valve 13, the compressed air in the energy recovery header pipe 3 enters the fresh water area of the reverse osmosis membrane core 6 of the reverse blowing group through the opened reverse blowing group reverse blowing electric air valve 14, then passes through the reverse osmosis membrane of the reverse osmosis membrane core 6 of the reverse blowing group to enter the seawater area, and blows through the reverse osmosis membrane of the reverse osmosis membrane core 6 of the reverse blowing group. When the compressed air in the seawater tank 5 of the back flushing group is used up, the pressure sensors arranged at the top of the seawater tank 5 of the back flushing group send signals, the computer controller closes the concentrated seawater electric valve 18 of the back flushing group, the energy recovery electric valve 13 of the back flushing group and the back flushing electric air valve 14, and then opens the fresh water electric valve 17 of the back flushing group, the pressurized seawater electric valve 15 of the back flushing group and the seawater outlet electric valve 16 of the back flushing group. Seawater coming out of the booster pump 4 is sent into the seawater tank 5 of the back flushing group through the seawater pressing electric valve 15 of the back flushing group, seawater coming out of the bottom of the seawater tank 5 of the back flushing group sequentially passes through the flow sensor and the opened seawater water outlet electric valve 16 of the back flushing group to enter a seawater area of the reverse osmosis membrane core 6 of the back flushing group, fresh water molecules pass through the reverse osmosis membrane to enter a fresh water area, and fresh water flowing out of the fresh water area of the reverse osmosis membrane core 6 of the back flushing group is gathered together and then flows to the fresh water pool 8 through the opened fresh water electric valves 17 of the back flushing groups. After the seawater tank 5 of the energy recovery group receives the set number of times of energy recovery, the computer control instrument opens the pressurization electric air valve 11 of the energy recovery group, and the compressed air from the air storage tank 2 enters the seawater tank 5 of the energy recovery group through the opened pressurization electric air valve 11 of the energy recovery group. When the air pressure in the seawater tank 5 reaches 1.8MPa, the computer control instrument closes the group of the pressurization electric air valves 11, when the air pressure in the seawater tank 5 is lower than 1.5MPa, the computer control instrument reopens the group of the pressurization electric air valves 11, and after the times are repeatedly set, the reverse osmosis membrane core 6 is subjected to one-time back washing.
Claims (2)
1. An energy recovery system in seawater desalination, wherein pretreated seawater is filled in a seawater pool, an inlet pipe of a booster pump is placed in the seawater pool, an outlet pipe of the booster pump is divided into a plurality of groups of branch outlet pipes, each branch outlet pipe is connected to each group of seawater tanks through each group of booster seawater electric valves, each seawater tank is provided with a water level sensor, the top of each seawater tank is provided with a pressure sensor, a pipeline connected from the bottom of each seawater tank is sequentially connected to a seawater area of each group of reverse osmosis membrane cores through a flow sensor and a seawater outlet electric valve, ten reverse osmosis membrane cores are a group, concentrated seawater pipes connected from each group of reverse osmosis membrane core seawater area are connected together through a concentrated seawater electric valve and then connected to a concentrated seawater pool through each group of fresh water electric valves; the air pipe connected from the air compressor is connected to the air storage tank through a one-way air valve, the air storage tank is provided with a pressure sensor, and the back-washing branch air pipe connected from the air storage tank is connected to the fresh water area of each group of reverse osmosis membrane cores through each group of back-washing electric air valves; the method is characterized in that: the pressurizing branch gas pipe connected from the gas storage tank (2) is connected to the top of each group of seawater tanks (5) through each group of pressurizing electric gas valves (11), the energy recovery branch gas pipe connected from the top of the seawater tanks (5) is collected to the energy recovery main pipe (3) after passing through each group of energy recovery electric gas valves (13), and the back-blowing branch gas pipe connected from the energy recovery main pipe (3) is connected to the fresh water area of each group of reverse osmosis membrane cores (6) through each group of back-blowing electric gas valves (14).
2. The control method of the energy recovery system in the seawater desalination is characterized in that: starting the air compressor (1), enabling compressed air from the air compressor (1) to enter the air storage tank (2) through the one-way air valve (10), stopping the electricity of the air compressor (1) by the computer control instrument when the air pressure of the air storage tank (2) reaches 2.8MPa, enabling the one-way air valve (10) to prevent the compressed air in the air storage tank (2) from being pressed into the air compressor (1), and restarting the air compressor (1) when the air pressure of the air storage tank (2) is lower than 2.5 MPa; seawater is sent into a seawater pool (7) after being pretreated, seawater in the seawater pool (7) is pumped by a booster pump (4) and then sent into each group of seawater tanks (5) through each group of booster seawater electric valves (15), each group of seawater outlet electric valves (16) and each group of fresh water electric valves (17) are opened, seawater is sent out from the bottom of each seawater tank (5) and then sequentially enters a seawater area of each group of reverse osmosis membrane cores (6) through a flow sensor and the opened seawater outlet electric valves (16), fresh water molecules pass through reverse osmosis membranes to enter a fresh water area, fresh water flowing out from each group of reverse osmosis membrane cores (6) in the fresh water area is gathered together and then flows into a fresh water pool (8) through each group of opened fresh water electric valves (17), the air pressure and the water level of each group of seawater tanks (5) are continuously raised, when seawater in a certain seawater tank (5) reaches a high water level, a sensor arranged on the seawater tank (5) sends a signal, the computer control instrument closes the set of pressurized seawater electric valves (15); the computer control instrument selects a group of reverse osmosis membrane cores, opens the group of pressurizing electric air valves (11), compressed air coming out of the air storage tank (2) enters the pressurizing group seawater tank (5) through the opened pressurizing electric air valves (11) of the pressurizing group, when the air pressure in the seawater tank (5) reaches 1.8MPa, the computer control instrument closes the group of pressurizing electric air valves (11), when the air pressure in the seawater tank (5) is lower than 1.5MPa, the computer control instrument reopens the group of pressurizing electric air valves (11), and after the times are repeatedly set, the reverse osmosis membrane cores (6) are subjected to one-time back flushing: the computer control instrument closes the back washing set fresh water electric valve (17), and opens the back washing set energy recovery electric valve (13) and the back washing electric air valve (12); the computer control instrument selects a group of reverse osmosis membrane cores (6) as an energy recovery group, and opens an energy recovery electric valve (13) of the energy recovery group; compressed air with the pressure of 1.8MPa in a seawater tank (5) of a backwashing group enters an energy recovery main pipe (3) by opening an energy recovery electric valve (13), then enters the seawater tank (5) by the opened energy recovery electric valve (13), compressed air with the pressure exceeding 2.5MPa in an air storage tank (2) enters a reverse osmosis membrane core (6) fresh water area of the backwashing group by an opened backwashing electric air valve (12) of the backwashing group, passes through a reverse osmosis membrane together with fresh water to reach a seawater area to perform backwashing on the reverse osmosis membrane, and enters the seawater tank (5) of the backwashing group by an opened seawater outlet electric valve (16) of the backwashing group; after the backwashing reaches the set time, the computer control instrument closes the energy recovery electric valve (13) of the energy recovery receiving set, the energy recovery electric valve (13) of the backwashing set and the backwashing electric air valve (12); then the computer control instrument opens the back washing set pressurizing electric air valve (11) and the fresh water electric valve (17), compressed air in the air storage tank (2) enters the set of seawater tank (5) again through the opened set pressurizing electric air valve (11), the air pressure in the set of seawater tank (5) is increased, more fresh water molecules pass through the reverse osmosis membrane of the set of reverse osmosis membrane core (6) to enter a fresh water area, the flow rate of seawater outlet water of the set of seawater tank (5) is increased, when the flow rate of outlet water of the set of seawater tank (5) reaches a set high flow rate, the set flow rate sensor sends a high flow rate signal, the computer control instrument closes the set pressurizing electric air valve (11), until the flow rate of outlet water of the set of seawater tank (5) is reduced to a set bottom flow rate, the computer control instrument reopens the set pressurizing electric air valve (11), and compressed air in the air storage tank (2) enters the set of seawater tank (5) through the opened set pressurizing electric air valve, the air pressure in the group of seawater tanks (5) is increased, and the process is repeated for a plurality of times until the air pressure in the group of seawater tanks (5) is increased to 1.8MPa, and then back washing is carried out again: after backwashing for a plurality of times, the seawater in the seawater tank (5) is reduced to a set low water level, a water level sensor arranged in the seawater tank (5) sends a low water level signal, and the reverse osmosis membrane core (6) is subjected to back flushing for one time: the computer control instrument closes the back flushing group pressurizing electromagnetic air valve (11) and the fresh water electric valve (17), then opens the back flushing group concentrated seawater electric valve (18) and the back flushing electric air valve (12), the concentrated seawater in the back flushing group seawater tank (5) flows into the concentrated seawater pool (9) through the opened seawater outlet electric valve (16) and the concentrated seawater electric valve (18), the compressed air with pressure over 2.5MPa in the air storage tank (2) flows into the fresh water area of the reverse osmosis membrane core (6) of the back flushing group through the opened back flushing electric air valve (12) to pass through the reverse osmosis membrane together with the fresh water to reach the seawater area for back flushing, and the concentrated seawater in the seawater area of the reverse osmosis membrane core (6) of the back flushing group flows into the concentrated seawater pool (9) through the opened concentrated seawater electric valve (18) under the pressure of the compressed air; the concentrated seawater in the back-flushing group seawater tank (5) flows out, a water level sensor arranged in the back-flushing group seawater tank (5) sends a signal, and a computer controller closes a seawater outlet electric valve (16) of the back-flushing group; after the opening time of the back flushing electric air valve (12) of the back flushing group reaches a set value, the computer controller closes the back flushing electric air valve (12) of the back flushing group, then opens the fresh water electric valve (17) of the back flushing group, fresh water in a fresh water area of the reverse osmosis membrane core (6) of the back flushing group flows into a fresh water pool (8) through the opened fresh water electric valve (17) under the pressure of residual compressed air, the opening time of the fresh water electric valve (17) of the back flushing group reaches the set value, and after fresh water in the fresh water area of the reverse osmosis membrane core (6) of the back flushing group is exhausted, the computer controller closes the fresh water electric valve (17) of the back flushing group, and then opens the energy recovery electric air valve (13) and the back flushing electric air valve (14) of the back flushing group; compressed air in the back-flushing group seawater tank (5) enters the energy recovery main pipe (3) through the opened back-flushing group energy recovery electric valve (13), the compressed air in the energy recovery main pipe (3) enters a fresh water area of the reverse osmosis membrane core (6) of the back-flushing group through the opened back-flushing group electric air valve (14), then passes through the reverse osmosis membrane of the reverse osmosis membrane core (6) of the back-flushing group and enters a seawater area, and the reverse osmosis membrane of the reverse osmosis membrane core (6) of the back-flushing group is blown through; the compressed air in the seawater tank (5) of the back flushing group is exhausted, the pressure sensors arranged at the top of the seawater tank (5) of the back flushing group send signals, the computer controller closes the electric valve (18) for the concentrated seawater of the back flushing group, the electric valve (13) for energy recovery of the back flushing group and the electric valve (14) for back flushing, then opens the electric valve (17) for fresh water of the back flushing group, the electric valve (15) for pressurized seawater of the back flushing group and the electric valve (16) for seawater outlet of the back flushing group, the seawater from the booster pump (4) passes through the electric valve (15) for pressurized seawater of the back flushing group and is sent into the seawater tank (5) of the back flushing group, the seawater from the bottom of the seawater tank (5) of the back flushing group sequentially passes through the flow sensor and the opened electric valve (16) for seawater outlet of the back flushing group and enters the seawater area of the reverse osmosis membrane core (6) of the back flushing group, and fresh water molecules pass through the reverse osmosis membrane and enter the fresh water area, fresh water flowing out of the fresh water area of the reverse osmosis membrane core (6) of the back flushing group is gathered together and then flows to the fresh water pool (8) through the fresh water electric valves (17) of the back flushing groups which are opened; after the seawater tank (5) of the energy recovery group receives the energy recovery for the set times, the computer controller opens the pressurizing electric air valve (11) of the energy recovery group, compressed air from the air storage tank (2) enters the seawater tank (5) of the energy recovery group through the opened pressurizing electric air valve (11) of the energy recovery group, when the air pressure in the seawater tank (5) reaches 1.8MPa, the computer controller closes the pressurizing electric air valve (11), when the air pressure in the seawater tank (5) is lower than 1.5MPa, the computer controller reopens the pressurizing electric air valve (11), and after the set times are repeated, the reverse osmosis membrane core (6) is subjected to one-time back washing.
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| CN102190349A (en) * | 2011-01-09 | 2011-09-21 | 张英华 | Seawater desalting plant |
| CN102399029A (en) * | 2010-09-15 | 2012-04-04 | 株式会社东芝 | Membrane filtration system |
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| CN108706782A (en) * | 2018-06-29 | 2018-10-26 | 上海汉盛环保科技有限公司 | A kind of sea water desalination processing unit |
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| CN102399029A (en) * | 2010-09-15 | 2012-04-04 | 株式会社东芝 | Membrane filtration system |
| CN102190349A (en) * | 2011-01-09 | 2011-09-21 | 张英华 | Seawater desalting plant |
| EP2514721A1 (en) * | 2011-04-22 | 2012-10-24 | Ebara Corporation | Seawater desalination system and energy exchange chamber |
| CN104667749A (en) * | 2015-02-14 | 2015-06-03 | 张英华 | Energy recoverer and method for increasing water yield of reverse osmosis sea water desalination device |
| CN108706782A (en) * | 2018-06-29 | 2018-10-26 | 上海汉盛环保科技有限公司 | A kind of sea water desalination processing unit |
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