CN112158903B - Seawater desalination device based on solution dehumidification - Google Patents
Seawater desalination device based on solution dehumidification Download PDFInfo
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- CN112158903B CN112158903B CN202011070031.6A CN202011070031A CN112158903B CN 112158903 B CN112158903 B CN 112158903B CN 202011070031 A CN202011070031 A CN 202011070031A CN 112158903 B CN112158903 B CN 112158903B
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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
- C02F1/22—Treatment of water, waste water, or sewage by freezing
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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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- 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
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Abstract
The invention discloses a seawater desalination device based on solution dehumidification.A low-moisture-content air is prepared by absorbing moisture of air by using a concentrated solution from a solution regenerator, and then exchanges heat with an evaporator of a heat pump cycle to obtain low-temperature low-moisture-content air for evaporation and freezing of seawater; the heat released in the condenser in the heat pump cycle is used for solution regeneration, and the cold in the evaporator is used for cooling the air with low moisture content used for evaporating the seawater; spraying the cooled seawater in low-temperature low-moisture air environment, evaporating, freezing and separating out ice crystals to form ice crystal-brine slurry, and separating, washing and thawing to obtain fresh water. The invention is based on the principle that the seawater desalination by the vacuum method utilizes the pressure difference of water vapor in the air to drive the seawater to evaporate and freeze, selects the air with low moisture content to realize the evaporation and the freezing of the seawater in order to avoid huge energy consumption caused by vacuum pumping, and greatly reduces the energy consumption compared with the seawater desalination by the vacuum method.
Description
Technical Field
The invention belongs to the field of seawater desalination, and relates to a seawater desalination device based on solution dehumidification.
Background
In recent years, with the rapid development of social economy, the deterioration of water ecological environment is serious, and the contradiction between water resource supply and demand in China is further aggravated. China has abundant ocean resources, further promotes the development of the seawater desalination industry, and is an effective means for solving the shortage of water resources in China.
The sea water desalination by the freezing method is a hot point of research in the industry, the melting heat of water used by the freezing method is 1/7 of the vaporization heat of water, and compared with the distillation method, the freezing method greatly saves energy, but ice blocks prepared in the sea water desalination process by the freezing method are large, salt cells inevitably exist in the ice blocks, and the prepared fresh water has poor taste. The vacuum freezing method for sea water desalination is based on the three-phase point principle of water, and near the three-phase point of water, three phases of vapour, liquid and solid coexist, if the sea water is controlled near the three-phase point, the evaporation and icing of sea water can be simultaneously implemented, and the vacuum freezing method utilizes the principle to atomize and spray the sea water in a vacuum evaporation chamber, and the sea water drops are formed into ice crystals, and then the ice crystals are washed, separated and melted to obtain fresh water.
Disclosure of Invention
The invention aims to provide a seawater desalination device based on solution dehumidification, which is a novel seawater desalination device provided based on a vacuum freezing method seawater desalination method, the key technology of the invention is the same as that of the vacuum freezing method, the invention utilizes the three-phase point principle of water, and is different from the vacuum freezing method that a large amount of energy is consumed to vacuumize an evaporation chamber.
The technical scheme of the invention is as follows:
a seawater desalination device based on solution dehumidification comprises a solution dehumidification system for preparing air with low moisture content, a heat pump system for cooling air and heating dilute solution and a seawater evaporation refrigeration system for seawater evaporation refrigeration desalination; the solution dehumidification system comprises a regenerator for solution regeneration and a dehumidifier for air dehumidification, wherein the regenerator generates a concentrated solution by using heat released by a condenser in the heat pump system, and then the concentrated solution is transferred into the dehumidifier to transfer heat and mass with air so as to prepare air with low moisture content, and then the cold released by an evaporator in the heat pump system is used for preparing the air with low temperature and low moisture content; and the low-temperature low-moisture-content air and the seawater precooled by the seawater evaporation freezing system perform heat and mass transfer in the evaporation freezing chamber, so that the seawater is frozen into ice crystals in the evaporation freezing chamber.
The solution dehumidification system further comprises a liquid storage device and a first heat exchanger; the solution in the regenerator is output from a solution outlet, sequentially passes through a liquid storage device and a first heat exchanger, is input from a dehumidifier solution inlet, is output from a dehumidifier solution outlet after transferring heat with air in the dehumidifier, sequentially passes through the liquid storage device and a condenser of a heat pump system, and is input to the solution inlet of the regenerator.
After the mass and heat transfer between the air in the dehumidifier and the solution, the air flows through the evaporator of the heat pump system for heat exchange and is conveyed into the evaporation freezing chamber, and the air outlet of the evaporation freezing chamber is connected with the air inlet of the dehumidifier to form a circulation loop.
The liquid storage device adopts a shell-and-tube structure, a solution inlet on the shell side of the liquid storage device is connected with a solution outlet of the regenerator, and a solution inlet on the tube side of the liquid storage device is connected with a solution outlet of the dehumidifier; a liquid storage tank is connected to a pipeline connecting a solution inlet on the side of the liquid storage device pipe and a solution outlet of the dehumidifier;
the first heat exchanger is of a shell-and-tube heat exchanger structure, the solution runs through the tube side, and the shell side is connected with an external cooling water system.
Be equipped with the packing plate in the dehumidifier, packing plate top is equipped with the deconcentrator with the solution entry intercommunication of dehumidifier, and solution flow direction and air flow direction are the adverse current direction in the dehumidifier.
The regenerator is also connected to an external ambient air delivery system.
The seawater evaporation freezing system also comprises a washing separator, an ice melting tank and a second heat exchanger; seawater is introduced into the second heat exchanger through a pipeline, a seawater outlet of the second heat exchanger is connected with a seawater inlet of the ice melting tank, and a seawater outlet of the ice melting tank is connected with a seawater inlet of the evaporation freezing chamber;
an ice crystal outlet of the evaporation freezing chamber is connected with an ice crystal inlet of the washing separator, and an ice crystal outlet of the washing separator is connected with the ice melting tank.
The second heat exchanger is of a shell-and-tube heat exchanger structure and comprises a shell and two tube bodies positioned in the shell, one end of a first tube body of the second heat exchanger is connected with a brine outlet of the evaporation freezing chamber, the other end of the first tube body of the second heat exchanger is communicated with the external environment, one end of a second tube body of the second heat exchanger is connected with a fresh water outlet of the ice melting tank, the other end of the second tube body of the second heat exchanger is connected with a water inlet of a fresh water storage tank, and a water outlet of the storage tank is connected with a water inlet of the washing separator.
And a joint is arranged on a pipeline connected with a brine outlet of the evaporation freezing chamber at one end of the first pipe body of the second heat exchanger, and the joint is connected with a brine outlet of the washing separator.
The heat pump system comprises the condenser and the evaporator, and further comprises a throttle valve and a compressor, wherein the outlet of the compressor is connected with the inlet of the condenser, the inlet of the condenser is connected with the inlet of the throttle valve, the outlet of the throttle valve is connected with the inlet of the evaporator, and the outlet of the evaporator is connected with the inlet of the compressor.
The device of the invention atomizes seawater into seawater water drops in the evaporation freezing chamber of the seawater evaporation freezing system, and simultaneously, the low-moisture-content air dehumidified by the dehumidifier of the solution dehumidification system is precooled by the evaporator of the heat pump system and then is also sent into the evaporation freezing chamber, so that the seawater water drops can be rapidly evaporated in the low-temperature low-moisture-content air, the evaporation latent heat absorbed by the evaporation of the seawater drops is rapidly formed into ice crystals, and simultaneously the salt in the liquid drops is extruded to the surface of the ice crystals.
The invention has the following beneficial effects:
the invention utilizes the air drying technology of solution dehumidification, seawater is sent into an evaporation freezing chamber after being precooled, and is atomized into water drops, and simultaneously, the air with low moisture content and dehumidified by the solution is also sent into the evaporation freezing chamber after being precooled, so that the water drops of the seawater can be rapidly evaporated in the air with low temperature and low moisture content, vaporization latent heat absorbed by the evaporation of the water drops of the seawater can be rapidly formed into ice crystals, and simultaneously, salt in the water drops is extruded to the surface of the ice crystals, thereby avoiding the problem that the taste of fresh water is poor finally prepared due to a large amount of salt cells in ice blocks in the seawater desalination by a freezing method, greatly improving the stability of a system in the seawater desalination process by the freezing method, and greatly reducing the cold quantity generated by the outside and required by the ice formation by the cold quantity brought by the vaporization of the water drops.
The invention also has the following advantages:
the invention utilizes the heat generated by the heat pump system as the driving energy of the system, and compared with the vacuum freezing method, the seawater desalination method consumes huge energy by the compressor to vacuumize the evaporation freezing chamber to create the environment with low water vapor pressure, and the system greatly reduces the electric energy consumption.
The invention removes most of water vapor in the air by using the solution to prepare the air with low moisture content, thereby creating an environment with low water vapor pressure and realizing the evaporation and the refrigeration of the seawater.
The invention maximizes the energy utilization, fully embodies the integral complementary advantage of the combined operation of the composite system, effectively utilizes the cold energy in the heat pump system while providing heat for the solution regeneration by utilizing the heat pump system, precools the air with low moisture content sent into the evaporation freezing chamber, greatly improves the energy utilization rate and effectively improves the operation efficiency of the system.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
In the figure: 1. a sea water tank; 2. a first twist valve; 3. a first water pump; 4. a second heat exchanger; 5. a second twist valve; 6. a water storage tank; 7. a third screw-on valve; 8. a second water pump; 9. a third water pump; 10. an ice melting tank; 11. a fourth screw valve; 12. a washing separator; 13. a fifth screw valve; 14. an evaporation freezing chamber; 15. a first fan; 16. a dehumidifier; 17. a sixth screw-on valve; 18. a liquid storage tank; 19. a seventh screw valve; 20. a solution pump; 21. a first heat exchanger; 22. a cooling water system; 23. an anti-corrosion pump; 24. an eighth screwed valve; 25. a reservoir; 26. a ninth screw valve; 27. a regenerator; 28. a second fan; 29. a throttle valve; 30. an evaporator; 31. a condenser; 32. a compressor; 33. a fourth water pump; 34. tenth screw valve.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the seawater desalination device based on solution dehumidification of the present embodiment includes a solution dehumidification system for producing air with low moisture content, a heat pump system for cooling air and heating dilute solution, and a seawater evaporation refrigeration system for seawater evaporation refrigeration desalination;
the solution dehumidification system comprises a regenerator 27 for solution regeneration and a dehumidifier 16 for air dehumidification, wherein the regenerator 27 generates a concentrated solution by using heat released by a condenser 31 in the heat pump system, and then the concentrated solution is transferred to the dehumidifier 16 to transfer heat and mass with air so as to prepare air with low moisture content, and then the cold released by an evaporator 30 in the heat pump system is used for preparing the air with low temperature and low moisture content; the low-temperature low-moisture-content air and the seawater precooled by the seawater evaporation freezing system perform heat and mass transfer in the evaporation freezing chamber 14, so that the seawater is frozen into ice crystals in the evaporation freezing chamber 14.
The sea water desalination device based on solution dehumidification of this embodiment makes the sea water be in the evaporation freezing chamber 14 of sea water evaporation freezing system, atomize into the sea water droplet, simultaneously, the process low moisture content air after 16 dehumidifications of solution dehumidification system, the warp heat pump system's evaporimeter 30 precooling back, also is sent into the evaporation freezing chamber to the sea water droplet can be in low temperature low moisture content's rapid evaporation in the air, and the latent heat of vaporization through self evaporation absorption rapidly forms the ice crystal, squeezes the salt in the liquid drop to the ice crystal surface simultaneously.
Specifically, the structure of the seawater evaporation freezing system is as follows:
the system is composed of a seawater tank 1, a first screwing valve 2, a first water pump 3, a second heat exchanger 4, a second screwing valve 5, a water storage tank 6, a third screwing valve 7, a second water pump 8, a third water pump 9, an ice melting tank 10, a fourth screwing valve 11, a washing separator 12, a fifth screwing valve 13 and an evaporation freezing chamber 14;
the seawater tank 1 is used for storing seawater to be desalinated, an outlet of the seawater tank 1 is connected with a seawater inlet of a shell of the second heat exchanger 4, a first screwed valve 2 and a first water pump 3 are connected to a connected pipeline, a seawater outlet of the shell of the second heat exchanger 4 is connected with an inlet of an internal pipeline of the ice melting tank 10, and an outlet of the internal pipeline of the ice melting tank 10 is connected with a seawater inlet of the evaporative freezing chamber 14;
a concentrated seawater outlet (brine outlet) of the evaporation freezing chamber 14 is connected with one end of a first pipe body of the second heat exchanger 4, a fifth screw-threaded valve 13 and a third water pump 9 are connected on a connected pipeline, the other end of the first pipe body is communicated with the external environment, and a second screw-threaded valve 5 is arranged on the communicated pipeline;
an ice crystal outlet of the evaporation freezing chamber 14 is connected with an ice crystal inlet of a washing separator 12, an ice crystal outlet of the washing separator 12 is connected with an ice crystal inlet of a shell of an ice melting tank 10, a fresh water outlet of the shell of the ice melting tank 10 is connected with one end of a second pipe body of the second heat exchanger 4, the other end of the second pipe body is connected with an inlet of a water storage tank 6 for storing fresh water, an outlet of the water storage tank 6 is connected with a fresh water inlet of the washing separator 12, and a third screwing valve 7 and a second water pump 8 are arranged on a connected pipeline;
the concentrated seawater outlet (brine outlet) of the scrub separator 12 is also connected to the first pipe of the second heat exchanger 4 by a third water pump 9.
And a fourth water pump 33 is arranged on a pipeline connecting the other end of the second pipe body in the second heat exchanger 4 with the inlet of the water storage tank 6 according to the requirement.
Specifically, the solution dehumidification system has the following structure:
the system is divided into two parts of solution dehumidification and solution regeneration, and consists of a dehumidifier 16, a liquid storage tank 18, a seventh screwed valve 19, a solution pump 20, a first heat exchanger 21, an anticorrosive pump 23, an eighth screwed valve 24, a liquid storage device 25 and a regenerator 27;
in the solution dehumidification part, an air outlet of an evaporation freezing chamber 14 of the seawater evaporation freezing system is connected with an air inlet of a dehumidifier 16, a first fan 15 is arranged on a connected pipeline, an air outlet of the dehumidifier 16 is connected with a pipeline inlet inside an evaporator 30 in the heat pump system, a second fan 28 is arranged on the connected pipeline, and a pipeline outlet inside the evaporator 30 is connected with an air inlet of the evaporation freezing chamber 14 to form air circulation.
In the solution regeneration process, the dilute solution outlet of the dehumidifier 16 is connected with the inlet of the liquid storage tank 18, the outlet of the liquid storage tank 18 is connected with the inlet of the internal pipeline of the liquid storage tank 25, a seventh screwed valve 19 and a solution pump 20 are arranged on the connected pipelines, the outlet of the internal pipeline of the liquid storage device 25 is connected with the inlet of the internal pipeline of a condenser 31 in the heat pump system, the outlet of the internal pipeline of the condenser 31 is connected with the solution inlet of a regenerator 27, the solution outlet of the regenerator 27 is connected with the shell inlet of the liquid storage device 25, the shell outlet of the liquid storage device 25 is connected with the inlet of the internal pipeline of the first heat exchanger 21, an eighth screwed valve 24 and an anticorrosive pump 23 are arranged on the connected pipelines, the outlet of the pipeline inside the first heat exchanger 21 is connected with the solution inlet of the dehumidifier 16, the shell inlet of the first heat exchanger 21 is connected with an external cooling water system 22, and the shell outlet of the first heat exchanger 21 is connected with the environment;
specifically, the heat pump system is composed of a compressor 32, a condenser 31, a throttle valve 29 and an evaporator 30, wherein the outlet of the compressor 32 is connected with the refrigerant inlet of the shell of the condenser 31, the refrigerant outlet of the shell of the condenser 31 is connected with the inlet of the throttle valve 29, the outlet of the throttle valve 29 is connected with the refrigerant inlet of the shell of the evaporator 30, and the refrigerant outlet of the shell of the evaporator 30 is connected with the inlet of the compressor 32.
As shown in fig. 1, the bottom of the dehumidifier 16, the regenerator 27 and the water storage tank 6 are respectively provided with a sixth screw valve 17, a ninth screw valve 26 and a tenth screw valve 34 for discharging liquid according to actual needs.
The working principle and the working process of the invention are as follows:
sending the cooled seawater into an evaporation freezing chamber 14, spraying the seawater in an air environment with low temperature and low moisture content for evaporation and freezing to separate out ice crystals to form ice crystal-brine slurry, separating and washing to remove salt attached to the surfaces and wrapped inside the ice crystals, and then melting to obtain fresh water; the low-moisture-content air is prepared by absorbing the moisture of the air by using the concentrated solution from the solution regenerator, and then exchanges heat with the evaporator 30 of the heat pump circulating system to obtain the low-temperature low-moisture-content air for evaporating and freezing the seawater; the heat released in the condenser 31 in the heat pump system is used for solution regeneration and the cold in the evaporator 30 is used for cooling the air with low moisture content used for evaporating seawater.
Specifically, the working principle of the heat pump system is as follows:
the input of electrical energy drives the operation of the compressor 32, the refrigerant circulates internally in the system, generates heat in the condenser 31, heats the solution fed to the regenerator 27, generates cold in the evaporator 30, and cools the air with low moisture content fed to the evaporative freezing chamber 14.
The working principle of the solution dehumidification system is as follows:
after absorbing the heat released by the condenser 31 in the heat pump system, the dilute solution is uniformly sprayed on the packing plate inside the regenerator 27 through the disperser, the dehumidifying solution flows downwards along the packing plate under the action of gravity to form a reverse convection heat transfer mass transfer with the air coming from the bottom of the regenerator 27, at this time, because the dehumidifying solution has higher temperature and the partial pressure of the water vapor is higher than the partial pressure of the water vapor in the air, the water vapor in the solution is transferred to the air under the action of differential pressure, the regenerating process of the dehumidifying solution is completed, and the dehumidifying solution is stored in the reservoir 25 of the concentrated solution. The regenerated dehumidifying solution in the reservoir 25 is sent to the first heat exchanger 21 through the anti-corrosion pump 23, the concentrated solution is sent to the dehumidifier 16 after being cooled by the cooling water system 22, and is sprayed onto the packing plate in the dehumidifier 16 through the disperser, and forms a counter-current heat and mass transfer with the air coming out of the evaporation freezing chamber 14, at this time, because the dehumidifying solution is low in temperature and the partial pressure of the water vapor is lower than that of the water vapor in the air, the water vapor in the solution is transferred to the solution under the action of pressure difference, and the dehumidifying process of the air is completed.
The working principle of the seawater evaporation, refrigeration and desalination system is as follows:
air from the dehumidifier 16 has low moisture content but high temperature, is cooled by an evaporator 30 of a heat pump system to obtain air with low temperature and low moisture content, and then is sent into the evaporation freezing chamber 14, seawater is pre-cooled and then is uniformly sprayed in the evaporation freezing chamber 14 through a distributor, at the moment, the partial pressure of water vapor of the air in the evaporation freezing chamber 14 is lower than the saturated partial pressure 609Pa of the saturated water vapor at the triple point of the seawater, and seawater droplets are evaporated under the driving of the partial pressure difference of the water vapor, and then generate heat and mass transfer with ambient air. The moisture content of the vapor evaporated by the air absorbing the liquid drops is increased, the temperature of the seawater liquid drops is continuously reduced because the surface of the seawater liquid drops is gradually evaporated and the latent heat of vaporization is continuously taken away, the liquid drops are changed into ice crystals when encountering a refrigerator after being supercooled, and the salt in the seawater is extruded to the surfaces of the ice crystals because of the icing of the water. The ice crystals with salt attached on the surface and the concentrated seawater (salt water) which is not changed into the ice crystals are separated by a filter screen, the ice crystals enter a washing separator 12, part of fresh water is introduced into a fresh water storage tank 6 and enters the washing separator 12, the ice crystals are sprayed by a distributor to remove the salt on the surfaces of the ice crystals, the ice crystals and the salt water are separated by the filter screen, the ice crystals enter an ice melting tank 10, the salt water and the concentrated seawater separated from an evaporation freezing chamber 14 are converged and enter a second heat exchanger 4 to pre-cool the seawater which is not desalinated, the ice crystals in the ice melting tank 10 pre-cool the seawater which is sent into the evaporation freezing chamber 14, and the seawater is sent into the fresh water storage tank 6 after being melted. The air from the evaporative freezing chamber 14, which has a high moisture content, is sent to the dehumidifier 16 for dehumidification under the action of the fan, and is changed into reusable air with a low moisture content again, so that the system is operated circularly.
The invention utilizes the air drying technology of solution dehumidification, seawater is sent into an evaporation freezing chamber after being precooled, and is atomized into water drops, and simultaneously, the air with low moisture content and dehumidified by the solution is also sent into the evaporation freezing chamber after being precooled, so that the water drops of the seawater can be rapidly evaporated in the air with low temperature and low moisture content, vaporization latent heat absorbed by the evaporation of the water drops of the seawater can be rapidly formed into ice crystals, and simultaneously, salt in the water drops is extruded to the surface of the ice crystals, thereby avoiding the problem that the taste of fresh water is poor because of a large ice making volume and a large amount of salt cells in the prepared ice blocks in the seawater desalination by a freezing method. Meanwhile, the stability of the system in the process of seawater desalination by a freezing method is greatly improved, and the cold quantity generated from the outside required by icing is greatly reduced through the cold quantity brought by self vaporization.
The invention is based on the principle that the seawater desalination by a vacuum method utilizes the pressure difference of water vapor in air to drive seawater to evaporate and freeze, and selects air with low moisture content to realize the evaporation and the freezing of the seawater in order to avoid huge energy consumption caused by vacuum pumping. Compared with the vacuum method for seawater desalination, the method has great energy-saving potential, is beneficial to energy conservation and environmental protection, and effectively improves the operating efficiency of the system.
Claims (7)
1. A seawater desalination device based on solution dehumidification is characterized by comprising a solution dehumidification system for preparing air with low moisture content, a heat pump system for cooling air and heating dilute solution and a seawater evaporation refrigeration system for seawater evaporation refrigeration desalination;
the solution dehumidification system comprises a regenerator (27) for solution regeneration and a dehumidifier (16) for air dehumidification, wherein the regenerator (27) generates a concentrated solution by using heat released by a condenser (31) in the heat pump system, the concentrated solution is transferred to the dehumidifier (16) to perform heat and mass transfer with air so as to prepare air with low moisture content, and cold released by an evaporator (30) in the heat pump system is used to prepare air with low temperature and low moisture content; the low-temperature low-moisture-content air and the seawater precooled by the seawater evaporation freezing system are subjected to heat and mass transfer in the evaporation freezing chamber (14), so that the seawater is frozen into ice crystals in the evaporation freezing chamber (14);
the solution dehumidification system further comprises a liquid reservoir (25), a first heat exchanger (21); the solution in the regenerator (27) is output from a solution outlet, sequentially passes through a liquid storage device (25) and a first heat exchanger (21), is input from a solution inlet of a dehumidifier (16), is output from a solution outlet of the dehumidifier (16) after mass and heat transfer with air in the dehumidifier (16), sequentially passes through the liquid storage device (25) and a condenser (31) of a heat pump system, and is input to a solution inlet of the regenerator (27);
after the mass and heat transfer between the air in the dehumidifier (16) and the solution, the air flows through an evaporator (30) of the heat pump system for heat exchange and is conveyed into the evaporation freezing chamber (14), and an air outlet of the evaporation freezing chamber (14) is connected with an air inlet of the dehumidifier (16) to form a circulation loop;
the seawater evaporation freezing system also comprises a washing separator (12), an ice melting tank (10) and a second heat exchanger (4); seawater is introduced into the second heat exchanger (4) through a pipeline, a seawater outlet of the second heat exchanger (4) is connected with a seawater inlet of the ice melting tank (10), and a seawater outlet of the ice melting tank (10) is connected with a seawater inlet of the evaporation freezing chamber (14);
an ice crystal outlet of the evaporation freezing chamber (14) is connected with an ice crystal inlet of the washing separator (12), and an ice crystal outlet of the washing separator (12) is connected with the ice melting tank (10).
2. The seawater desalination plant based on solution dehumidification according to claim 1, wherein the liquid reservoir (25) is of a shell-and-tube structure, a solution inlet on the shell side of the liquid reservoir (25) is connected with a solution outlet of the regenerator (27), and a solution inlet on the tube side of the liquid reservoir (25) is connected with a solution outlet of the dehumidifier (16); a liquid storage tank (18) is connected to a pipeline connecting a solution inlet on the pipe side of the liquid storage device (25) and a solution outlet of the dehumidifier (16); the first heat exchanger (21) adopts a shell-and-tube heat exchanger structure, the solution runs through the tube side, and the shell side is connected with an external cooling water system (22).
3. The seawater desalination plant based on solution dehumidification as claimed in claim 1, wherein a filler plate is arranged in the dehumidifier (16), a disperser is arranged above the filler plate and communicated with the solution inlet of the dehumidifier (16), and the solution flow direction and the air flow direction in the dehumidifier (16) are in a counter-current direction.
4. A solution dehumidification based seawater desalination plant as claimed in claim 1 wherein the regenerator (27) is further connected to an external ambient air delivery system.
5. The seawater desalination device based on solution dehumidification according to claim 1, wherein the second heat exchanger (4) is of a shell-and-tube heat exchanger structure, and comprises a housing and two tubes located in the housing, one end of the first tube of the second heat exchanger (4) is connected with a brine outlet of the evaporation freezing chamber (14), the other end of the first tube is communicated with the external environment, one end of the second tube of the second heat exchanger (4) is connected with a fresh water outlet of the ice melting tank (10), the other end of the second tube is connected with a water inlet of the fresh water storage tank (6), and a water outlet of the storage tank (6) is connected with a water inlet of the scrubbing separator (12).
6. The seawater desalination device based on solution dehumidification according to claim 5, wherein a joint is arranged on a pipeline connecting one end of the first pipe body of the second heat exchanger (4) with a brine outlet of the evaporation freezing chamber (14), and the joint is connected with the brine outlet of the washing separator (12).
7. A solution dehumidification-based seawater desalination plant as claimed in any one of claims 1 to 6, wherein the heat pump system comprises said condenser (31) and said evaporator (30), further comprising a throttle valve (29) and a compressor (32), wherein the outlet of said compressor (32) is connected to the inlet of the condenser (31), the inlet of the condenser (31) is connected to the inlet of the throttle valve (29), the outlet of the throttle valve (29) is connected to the inlet of the evaporator (30), and the outlet of the evaporator (30) is connected to the inlet of the compressor (32).
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| CN202011070031.6A CN112158903B (en) | 2020-09-30 | 2020-09-30 | Seawater desalination device based on solution dehumidification |
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| CN202011070031.6A CN112158903B (en) | 2020-09-30 | 2020-09-30 | Seawater desalination device based on solution dehumidification |
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| CN112158903A CN112158903A (en) | 2021-01-01 |
| CN112158903B true CN112158903B (en) | 2022-03-04 |
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| CN113108388A (en) * | 2021-05-08 | 2021-07-13 | 艾尔科建设工程(江苏)有限公司 | Air treatment and fresh water preparation composite type purification fresh air system |
| CN113104920A (en) * | 2021-05-08 | 2021-07-13 | 艾尔科建设工程(江苏)有限公司 | Low-level heat source driving fresh water preparation system based on solution circulation |
| CN113526601A (en) * | 2021-06-30 | 2021-10-22 | 东南大学 | Seawater desalination system based on runner deep dehumidification |
| CN115342597A (en) * | 2022-07-01 | 2022-11-15 | 中国石油化工股份有限公司 | LNG cold energy used for air separation and seawater desalination system and comprehensive utilization method thereof |
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