Hypergravity freezing seawater desalination device and desalination method

Abstract

The present application relates to the field of seawater desalination, and particularly to a supergravity freezing seawater desalination method and device. The device comprises a supergravity crystallization mechanism and an ice-water separation mechanism arranged in a sealed shell. The supergravity crystallization mechanism comprises a supergravity circular freezing crystallization plate and a scraper. The supergravity circular freezing crystallization plate rotates at high speed to form a supergravity field. The refrigerant in the supergravity circular freezing crystallization plate exchanges heat with seawater. The seawater crystallizes and adheres to the outer surface of the supergravity circular freezing crystallization plate. The inner side of the sealed shell is provided with a scraper. The ice-water separation mechanism is located below the supergravity crystallization mechanism to separate ice crystals from concentrated brine. The characteristics of mass transfer strengthening of the supergravity field are used to make the concentrated brine remaining in the ice crystals overcome the surface tension and capillary adhesion force, thereby avoiding the formation of salt cells. Under the centrifugal action, the salt water adhering to the surface of the ice crystals is more easily separated, which can further improve the desalination rate. The continuous crystallization and separation of seawater are realized, and the desalination efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seawater desalination, and particularly to a supergravity freezing seawater desalination method and device. BACKGROUND

[0002] With the continuous growth of global population, water resource shortage has become a serious challenge. It is estimated that by 2030, global water resource shortage will exceed 4 trillion cubic meters / year, and more than 5 billion people will face water shortage.

[0003] Seawater desalination refers to the process of separating fresh water from seawater. 70% of the earth's surface is covered by oceans, and developing seawater desalination technology in coastal areas is beneficial to increasing fresh water resources from the source. At present, more than 19000 various seawater desalination plants have been built worldwide, and the global seawater desalination capacity can reach 100 million cubic meters / day.

[0004] Seawater desalination technology can be divided into thermal and membrane seawater desalination according to whether there is a phase change. Membrane seawater desalination represented by reverse osmosis has become the main way of seawater desalination in the world today due to its low energy consumption, simple structure and other characteristics. Thermal seawater desalination represented by multi-effect evaporation and multi-stage flash evaporation is easy to be large-scale, but has high energy consumption and is more commonly used in regions rich in fossil energy such as the Middle East. Freezing seawater desalination is a kind of thermal seawater desalination, which is more suitable for desalination of low-temperature seawater compared to the above mainstream seawater desalination methods. On the one hand, the energy consumption is low, and on the other hand, the desalination cost is relatively small. However, due to the different heat and mass transfer rates in the seawater freezing crystallization process, solute enrichment occurs, salt cells affect the desalination effect, and it has not been widely applied.

[0005] Supergravity field refers to the acceleration of an object greater than the gravitational acceleration on the surface of the earth. In a supergravity environment, the shear force on the liquid is much greater than the surface tension, and the liquid can be easily stretched into micron to nanometer liquid film, liquid filament or liquid droplet, the contact area is large and the phase interface is updated quickly, which is beneficial to improve the mass transfer rate between phases. As a frontier separation technology, supergravity field has been successfully applied in many fields such as rectification, absorption and metallurgy, but its application in seawater desalination, especially in freezing seawater desalination, is still rarely reported. SUMMARY

[0006] The present application aims to overcome the above-mentioned defects in the prior art and proposes a supergravity freezing seawater desalination device and method. The supergravity field is used to strengthen the mass transfer characteristics, so that the concentrated salt water remaining in the ice crystals overcomes the surface tension and capillary adhesion force, avoiding the formation of salt cells. Under the action of centrifugal force, the salt water attached to the surface of the ice crystals is more easily separated, which can further improve the desalination rate, realize the continuous crystallization and separation of seawater, and has high desalination efficiency.

[0007] The technical scheme of the present application is: a supergravity freezing seawater desalination device, comprising a sealed shell, wherein, further comprising a supergravity crystallization mechanism and an ice-water separation mechanism arranged in the sealed shell;

[0008] The supergravity crystallization mechanism comprises a supergravity circular freezing crystallization plate and a scraper, the supergravity circular freezing crystallization plate rotates at high speed to form a supergravity field, the refrigerant in the supergravity circular freezing crystallization plate exchanges heat with seawater, seawater crystallizes and adheres to the outer surface of the supergravity circular freezing crystallization plate, and the inner side of the sealed shell is provided with the scraper;

[0009] The ice-water separation mechanism is located below the supergravity crystallization mechanism and realizes the separation of ice crystals and concentrated brine.

[0010] In the present application, the supergravity crystallization mechanism further comprises:

[0011] The first rotating shaft is in transmission connection with the output shaft of the motor, and the supergravity circular freezing crystallization plate is fixedly connected with the first rotating shaft;

[0012] The seawater spraying part comprises a plurality of seawater nozzles, each column of seawater nozzles comprises a plurality of seawater nozzles arranged at intervals along the axial direction of the supergravity circular freezing crystallization plate, and the seawater nozzles are arranged on the inner wall of the sealed shell;

[0013] The inside of the supergravity circular freezing crystallization plate is provided with a refrigerant flow channel, and the outer side of the supergravity circular freezing crystallization plate is provided with a hydrophilic film;

[0014] A plurality of scrapers are arranged along the inner wall of the sealed shell, and each column of scrapers comprises a plurality of scrapers arranged at intervals along the axial direction of the supergravity circular freezing crystallization plate.

[0015] The refrigerant channel comprises:

[0016] The flow circulation ring channel is arranged at the annular outer side of the supergravity circular freezing crystallization plate and is continuously arranged along the outer side of the supergravity circular freezing crystallization plate;

[0017] The bottom flow channel is arranged at the bottom of the supergravity circular freezing crystallization plate, and the side flow circulation ring channel is communicated through the bottom flow channel;

[0018] The refrigerant channel is in communication with the refrigerant inlet and the refrigerant outlet arranged at the top of the sealed shell, and the refrigerant inlet and the refrigerant outlet are symmetrically arranged.

[0019] The cutting edge of the scraper is arranged towards the supergravity circular freezing crystallization plate;

[0020] The other side of the corresponding scraper is provided with a connecting shaft, and a connecting shaft sleeve is arranged in the inside of the sealed shell, the connecting shaft is slidingly arranged in the connecting shaft sleeve, and the connecting shaft and the sealed shell are connected through a spring, and the spring is arranged in the sliding shaft sleeve.

[0021] The blade of the scraper is trapezoidal, and there is a gap between adjacent scrapers.

[0022] The ice-water separation mechanism comprises:

[0023] The second rotating shaft is connected with the first rotating shaft through a shaft coupling at the top end and is rotationally connected with the sealing shell at the bottom end

[0024] The ice crystal filter screen is fixed on the second rotating shaft and is located below the supergravity circular freezing crystallization plate.

[0025] The base is located below the ice crystal filter screen.

[0026] The device further comprises an air extraction mechanism, and the air extraction mechanism comprises a vacuum pump in communication with the sealing shell.

[0027] The application further comprises a method for desalinating seawater by using the supergravity freezing seawater desalination device, and the method comprises the following steps:

[0028] S1. In a supergravity environment, crystallization of seawater is realized by using a refrigerant, and during the crystallization process, concentrated brine in the seawater is separated from the ice crystals being formed and is thrown out, and the ice crystals being formed are attached to the annular outer surface of the supergravity circular freezing crystallization plate.

[0029] S2. The ice crystals on the supergravity circular freezing crystallization plate are scraped off by using the scraper.

[0030] S3. The ice crystals are separated from the concentrated brine by using the ice-water separation mechanism.

[0031] In step S1, the vacuum pump is used to extract air from the sealing shell to form a vacuum environment in the sealing shell, and then the motor is actuated to drive the supergravity circular freezing crystallization plate to rotate at a high speed by the first rotating shaft to form a supergravity field.

[0032] The seawater is sprayed on the outer surface of the supergravity circular freezing crystallization plate through the seawater nozzle, the seawater is sprayed on the hydrophilic membrane of the supergravity circular freezing crystallization plate to form a brine liquid film, the brine liquid film exchanges heat with the refrigerant in the supergravity circular freezing crystallization plate, and the seawater is solidified into ice crystals.

[0033] During the process of solidifying the seawater into ice crystals, the concentrated brine is thrown out by overcoming the surface tension and capillary adhesion.

[0034] In step S3, the ice crystals scraped off by the scraper fall into the ice crystal filter screen of the ice-water separation mechanism, the ice crystals are washed by the fresh water to flush the concentrated brine on the surface of the ice crystals, and the ice crystal filter screen drives the ice crystals to rotate, and the centrifugal force generated during the rotation process realizes the separation of the ice crystals from the concentrated brine.

[0035] Finally, the ice crystals obtained are desalinated seawater.

[0036] The beneficial effects of the present application are:

[0037] (1) Utilize the supergravity field to improve the mass transfer rate of the solidification crystallization process, alleviate the solute enrichment phenomenon of the freezing method seawater desalination process, and avoid the formation of salt cells;

[0038] (2) Under the action of the supergravity field, the salt cells in the ice crystals and the surface concentrated brine can easily overcome the capillary adhesion and surface tension, and the concentrated brine and the ice crystals are easily separated, and the desalination rate is further improved by combining with fresh water washing;

[0039] (3) The supergravity circular freezing crystallization plate structure significantly improves the crystallization area, and the scraper is designed as a trapezoidal sawtooth structure, and the remaining gap is beneficial to the discharge of ice crystals;

[0040] (4) By changing the temperature of the refrigerant, the supercooling degree of seawater crystallization can be controlled, and the crystallization rate can be adjusted;

[0041] (6) Suitable for desalination and concentration of low-temperature seawater;

[0042] (7) The present application has low energy consumption, and can use renewable energy such as wind energy and solar energy to drive, which is energy-saving and environment-friendly.

[0043] In summary, the present application can utilize the mass transfer characteristics of the supergravity field to make the concentrated brine remaining in the ice crystals overcome the surface tension and capillary adhesion, thereby avoiding the formation of salt cells. On the other hand, a part of the salt solution will adhere to the surface of the ice crystals, and under the action of centrifugation, the salt water adhered to the surface is more easily separated, which can further improve the desalination rate. The present application can realize continuous crystallization and separation of seawater, and has high desalination efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a structural schematic diagram of the seawater desalination device described in the present application;

[0045] Figure 2 is a force structure schematic diagram of the salt cell in seawater;

[0046] Figure 3 is a top view structural schematic diagram of the supergravity circular freezing crystallization plate and the scraper;

[0047] Figure 4 is a structural schematic diagram of the scraper.

[0048] In the figure: 1 sealed shell; 2 vacuum pump; 3 first rotating shaft; 4 supergravity circular freezing crystallization plate; 5 motor; 6 refrigerant flow channel; 7 refrigerant inlet; 8 refrigerant outlet; 9 seawater nozzle; 10 seawater pump; 11 hydrophilic membrane; 12 scraper; 13 connecting shaft; 14 connecting shaft sleeve; 15 spring; 16 fresh water nozzle; 17 ice crystal filter screen; 18 base; 19 second rotating shaft; 20 coupling; 21 fresh water pump; 22 concentrated brine outlet; 23 ice crystal outlet. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] The following description sets forth specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art will be able to make similar generalizations without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Example 1

[0052] The present invention discloses a high-gravity refrigerated seawater desalination device, comprising a sealed housing 1, a high-gravity crystallization mechanism, an ice-water separation mechanism, and an air extraction mechanism. The high-gravity crystallization mechanism and the ice-water separation mechanism are both disposed within the sealed housing, with the ice-water separation mechanism located below the high-gravity crystallization mechanism. The air extraction mechanism is connected to the sealed housing and is used to evacuate the sealed housing, thereby creating a vacuum state within the sealed housing.

[0053] In this embodiment, the air extraction mechanism includes a vacuum pump 2 connected to the sealed housing 1. When the vacuum pump 2 is in operation, it evacuates the interior of the sealed housing 1, maintaining a vacuum environment within the sealed housing 1 during operation. During the freezing process of the seawater, the vacuum pump extracts air from the sealed housing, preventing the increase in heat transfer resistance caused by non-condensable gases during the freezing and crystallization of the seawater. This improves the heat exchange efficiency between the seawater and the refrigerant, facilitating the growth of ice crystals.

[0054] The high-gravity crystallization mechanism includes a first rotating shaft 3, a circular high-gravity frozen crystallization plate 4, a seawater spraying section, and a scraper section. The first rotating shaft 3 is fixedly connected to the output shaft of a motor 5, and the circular high-gravity frozen crystallization plate 4 is in transmission connection with the first rotating shaft 3. During operation, the motor 4 drives the first rotating shaft 3 and the circular high-gravity frozen crystallization plate 4 to rotate via its output shaft.

[0055] In the present application, a first rotating shaft 3 is disposed in the middle of a sealed housing 1 and is rotatably connected to the sealed housing in a sealed manner. The operation of a motor 4 causes the first rotating shaft 3 and the high-gravity circular frozen crystallization plate 4 to rotate at high speed, thereby generating a high-gravity field during the high-speed rotation.

[0056] In the present application, the supergravity circular frozen crystallization plate 4 is cylindrical. A refrigerant flow channel 6 is provided in the supergravity circular frozen crystallization plate 4. The refrigerant flow channel 6 includes a circulation loop provided near the annular outer side surface of the supergravity circular frozen crystallization plate and along its annular circumferential surface. The circulation loop is connected through a bottom flow channel located at the bottom of the supergravity circular frozen crystallization plate. Correspondingly, a refrigerant inlet 7 and a refrigerant outlet 8 are symmetrically provided at the top of the sealed shell, and the refrigerant inlet 7 and the refrigerant outlet 8 are both connected to the refrigerant flow channel 6. During operation, the refrigerant flows into the supergravity circular frozen crystallization plate from the refrigerant inlet 7, circulates along the refrigerant flow channel 6 in the supergravity circular frozen crystallization plate, and then flows out from the refrigerant outlet 8.

[0057] A seawater spray system is provided along the inner wall of the sealed housing, located outside the circular high-gravity frozen crystallization plate. This system includes a seawater pipeline and several seawater nozzles 9 evenly spaced along the pipeline. The nozzles 9 are arranged axially along the high-gravity circular frozen crystallization plate. A seawater pump 10 draws pretreated seawater into the pipeline and sprays it onto the outer surface of the circular high-gravity frozen crystallization plate 4 through the seawater nozzles 9.

[0058] The annular outer surface of the high-gravity circular frozen crystallization plate 4 is provided with a hydrophilic membrane 11. When seawater is sprayed onto the surface of the high-gravity circular frozen crystallization plate, it contacts the hydrophilic membrane 11, forming a brine liquid film. After exchanging heat with the low-temperature refrigerant inside the high-gravity circular frozen crystallization plate, the brine solidifies into ice crystals, which adhere to the outer surface of the high-gravity circular frozen crystallization plate 4. By controlling the temperature of the refrigerant, the degree of supercooling of the seawater crystallization can be adjusted.

[0059] During the crystallization of seawater, due to the high-speed rotation of the high-gravity circular freezing crystallization plate 4, under the action of the high-gravity field, the high-concentration salt water is more likely to overcome capillary adhesion and surface tension, and is less likely to form salt cells. Figure 2 As shown in the figure, under the high gravity working environment, the centrifugal force F exerted on the concentrated brine is c Therefore, during the formation of ice crystals, concentrated brine is more easily separated from the ice crystals, thereby effectively avoiding the formation of high-concentration salt cells in the ice crystals.

[0060] In the present application, a row of seawater nozzles arranged at intervals is provided in the sealed housing 1. When the volume of the sealed housing is large, in order to improve the desalination efficiency of the device, multiple rows of seawater nozzles can be provided on the inner wall of the sealed housing.

[0061] As the seawater is continuously frozen and crystallized, the ice layer adhered to the surface of the supergravity circular freezing and crystallizing plate is continuously thickened, and the ice layer adhered to the supergravity circular freezing and crystallizing plate is scraped off by the scraper part at this time. The scraper part includes a plurality of scrapers 12 arranged along the axial direction of the supergravity circular freezing and crystallizing plate. One end of the scraper 12 is connected with the sealing shell 1, and the blade of the scraper 12 is directed towards the supergravity circular freezing and crystallizing plate 4.

[0062] As shown in Figure 3 and Figure 4 , the plurality of scrapers are arranged in sequence in the vertical direction. The scraper 12 is connected with the sealing shell 1 through a connecting shaft 13 and a connecting shaft sleeve 14: the blade of the scraper 12 is directed towards the supergravity circular freezing and crystallizing plate 4, and the other side of the corresponding scraper 12 is fixed with the connecting shaft 13 which is slidingly arranged in the connecting shaft sleeve 14. The connecting shaft sleeve 14 is fixedly connected with the inner wall of the sealing shell 1, and the connecting shaft 13 is connected with the sealing shell 1 through a spring 15 arranged in the connecting shaft sleeve 14.

[0063] When the ice layer on the surface 4 of the supergravity circular freezing and crystallizing plate reaches a certain thickness, the blade of the scraper 12 directly contacts the ice layer. During the contact between the scraper 12 and the ice layer, the ice layer rotates with the crystallizing plate, so that the scraper can quickly scrape off the ice layer adhered to the outer surface of the crystallizing plate. The scraped ice layer directly falls into the ice-water separation mechanism below. Since the spring 15 is connected between the scraper 12 and the sealing shell 1, the scraper can radially expand and contract according to the thickness of the ice crystals, which not only improves the peeling efficiency of the ice crystals, but also protects the scraper.

[0064] In this embodiment, the blade of the scraper 12 is in the shape of a trapezoidal sawtooth, and there is a certain gap between adjacent scrapers. The gap between the two scrapers is conducive to the discharge of the ice crystals.

[0065] In this embodiment, a row of seawater scrapers are arranged in the sealing shell. When the volume of the sealing shell is large, in order to provide the desalination efficiency of the device, a plurality of rows of scrapers can be arranged on the inner wall of the sealing shell.

[0066] The ice-water separation mechanism comprises a fresh water nozzle 16, an ice crystal filter screen 17 and a base 18. The base 18 is arranged at the bottom of the sealed shell 1, and the ice crystal filter screen 17 is arranged above the base 18, and the base 18 supports the ice crystal filter screen 17. The ice crystal filter screen 17 is fixed on a second rotating shaft 19. In the embodiment, the second rotating shaft 19 is arranged at the middle of the sealed shell 1, the top end of the second rotating shaft 19 is connected with the first rotating shaft 3 through a coupling 20, and the bottom end of the second rotating shaft 19 is rotationally connected with the sealed shell 1. When the motor 5 drives the first rotating shaft 3 to rotate, the second rotating shaft 19 is driven to rotate through the coupling 20, so as to drive the ice crystal filter screen 17 fixedly connected with the second rotating shaft 19 to rotate. The ice crystals scraped off by the scraper fall into the ice crystal filter screen 17 below under the action of gravity.

[0067] The fresh water nozzle 16 is arranged on the bottom surface of the supergravity circular freezing crystallization plate 4, and the fresh water nozzle 16 is arranged above the ice crystal filter screen 17. Fresh water is delivered to the fresh water nozzle 16 through a fresh water pump 21, and the fresh water nozzle 16 sprays fresh water on the ice crystals of the ice crystal filter screen.

[0068] The surface of the ice crystals generated in the supergravity field freezing crystallization may be covered with concentrated brine, and in addition, the concentrated brine centrifugally thrown out by the supergravity circular freezing crystallization plate also falls on the ice crystals of the ice crystal filter screen. The fresh water sprayed by the fresh water nozzle 16 can wash the ice crystals. At the same time, the centrifugal force generated in the process that the ice crystal filter screen 17 rotates with the second rotating shaft 19 can further separate the residual salt on the surface of the ice crystals.

[0069] The bottom of the sealed shell 1 is provided with a concentrated brine outlet 22. The concentrated brine generated by the post-washing of the ice crystals falls to the bottom of the sealed shell under the action of gravity, and directly flows into an external concentrated brine collector along the concentrated brine outlet 22.

[0070] The side wall of the sealed shell 1 is provided with an ice crystal outlet 23. The ice crystals that have been washed and further removed of salt can be discharged through the ice crystal outlet 23.

[0071] Embodiment 2

[0072] The application further discloses a method for desalinating seawater by using the supergravity freezing seawater desalination device.

[0073] In the first step, the crystallization of seawater is realized by using a refrigerant in a supergravity field environment, and the ice crystals generated in the crystallization process are not easy to form high salt cells.

[0074] Before the whole device is operated, a vacuum pump is started to create a vacuum environment in the sealed shell.

[0075] The motor is started, and the motor drives the supergravity circular freezing crystallization plate to rotate at high speed through the first rotating shaft, so as to construct a supergravity field.

[0076] The pretreated seawater is pumped into the sealed shell by the seawater pump and is distributed by the nozzles arranged in the sealed shell. The seawater liquid is sprayed on the hydrophilic film on the annular outer surface of the supergravity circular freezing crystallization plate, so as to form a brine liquid film and exchange heat with the refrigerant in the supergravity circular freezing crystallization plate, and the seawater is frozen into ice crystals.

[0077] In the process of freezing the seawater into ice crystals, under the action of the supergravity field, the concentrated brine in the ice crystals can easily overcome the capillary adhesion and surface tension and be thrown away from the forming ice crystals, so that high-concentration salt cells are not easily formed in the ice crystals.

[0078] In the second step, the ice crystals formed by the seawater crystallization are continuously scraped off, and the scraped ice crystals fall into the ice-water separation mechanism.

[0079] With the continuous cooling and crystallization of the ice crystals on the annular outer surface of the supergravity circular freezing crystallization plate, the thickness of the ice crystals is continuously increased. When the ice crystals come into contact with the scraper arranged on the inner side wall of the sealed shell, the ice crystals are scraped off by the scraper and fall off the outer surface of the supergravity circular freezing crystallization plate and fall into the lower ice-water separation mechanism.

[0080] In the third step, the ice crystals in the ice-water separation mechanism are washed with fresh water, and the centrifugal force generated by the rotation of the ice-water separation mechanism realizes the separation of the fresh water and the concentrated brine.

[0081] The ice crystals scraped off by the scraper fall into the ice crystal filter screen in the ice-water separation mechanism, the fresh water pump pumps fresh water into the sealed shell, and the fresh water is sprayed on the surface of the ice crystals through the fresh water nozzle to wash the ice crystals. At the same time, the ice crystal filter screen rotates and drives the ice crystals contained in the ice crystal filter screen to rotate, and the centrifugal force generated in the rotation process realizes the separation of the ice crystals and the concentrated brine, so as to further separate the concentrated brine remaining on the surface of the ice crystals.

[0082] The concentrated brine falls into the inside of the sealed shell through the mesh holes on the ice crystal filter screen and flows out along the concentrated brine outlet at the bottom of the sealed shell. The washed ice crystals are discharged through the ice crystal outlet on the side wall of the sealed shell, and the ice crystals can be obtained after being melted.

[0083] The above is a detailed introduction to the supergravity refrigerated seawater desalination device and desalination method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The above description of the disclosed embodiments enables professionals in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A supergravity refrigerated seawater desalination device, comprising a sealed shell, characterized in that: The system also includes an ultra-gravity crystallization mechanism and an ice-water separation mechanism disposed in the sealed housing. The ultra-gravity crystallization mechanism includes an ultra-gravity circular frozen crystallization plate and a scraper. The ultra-gravity circular frozen crystallization plate rotates at high speed to form an ultra-gravity field. The refrigerant in the ultra-gravity circular frozen crystallization plate exchanges heat with the seawater, and the seawater crystallizes and adheres to the outer surface of the ultra-gravity circular frozen crystallization plate. The scraper is provided on the inside of the sealed housing. The ice-water separation mechanism is located below the ultra-gravity crystallization mechanism to separate ice crystals from concentrated brine. The high-gravity crystallization mechanism further includes: a seawater spraying portion, comprising a plurality of rows of seawater nozzles, each row of seawater nozzles comprising a plurality of seawater nozzles spaced apart along the axial direction of the high-gravity circular freezing crystallization plate, the seawater nozzles being arranged on the inner wall of the sealed housing; A refrigerant flow channel is provided inside the high-gravity circular frozen crystallization plate, and a hydrophilic film is provided on the outer side of the high-gravity circular frozen crystallization plate; several rows of scrapers are provided along the inner wall of the sealed shell, and each row of scrapers includes several scrapers spaced apart along the axial direction of the high-gravity circular frozen crystallization plate; It also includes an air extraction mechanism, which includes a vacuum pump, and the vacuum pump is connected to the sealed shell.

2. The high-gravity refrigerated seawater desalination device according to claim 1, characterized in that: The ultra-gravity crystallization mechanism further includes: a first rotating shaft, which is transmission-connected to the output shaft of the motor; and a circular ultra-gravity freezing crystallization plate is fixedly connected to the first rotating shaft.

3. The high-gravity refrigerated seawater desalination device according to claim 1, characterized in that: The refrigerant channel includes: a circulation ring, which is arranged near the annular outer side surface of the high-gravity circular freezing crystallization plate and is continuously arranged along the outer side surface of the high-gravity circular freezing crystallization plate; The bottom flow channel is arranged at the bottom of the supergravity circular freezing crystallization plate, and the side circulation loop is connected through the bottom flow channel; the refrigerant channel is respectively connected to the refrigerant inlet and the refrigerant outlet arranged at the top of the sealed shell, and the refrigerant inlet and the refrigerant outlet are arranged symmetrically.

4. The high-gravity refrigerated seawater desalination device according to claim 1, characterized in that: The blade of the scraper is arranged toward the high-gravity circular freezing crystallization plate; A connecting shaft is provided on the other side of the corresponding scraper, and a connecting shaft sleeve is provided inside the corresponding sealing shell. The connecting shaft is slidably arranged in the connecting shaft sleeve, and the connecting shaft and the sealing shell are connected through a spring, which is arranged in the sliding sleeve.

5. The high-gravity refrigerated seawater desalination device according to claim 4, characterized in that: The blades of the scrapers are trapezoidal, and there are gaps between adjacent scrapers.

6. The high-gravity refrigerated seawater desalination device according to claim 1, characterized in that: The ice-water separation mechanism includes: a second rotating shaft, the top end of which is connected to the first rotating shaft through a coupling, and the bottom end of which is rotatably connected to the sealed shell; an ice crystal filter fixed on the second rotating shaft and located below the supergravity circular freezing crystallization plate; a base located below the ice crystal filter; and a fresh water nozzle located above the ice crystal filter and arranged on the bottom surface of the supergravity circular freezing crystallization plate.

7. A method for desalinating seawater using the high-gravity refrigerated seawater desalination device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. In a hypergravity environment, seawater is crystallized using a refrigerant. During the crystallization process, the concentrated brine in the seawater separates from the forming ice crystals and is ejected. The resulting ice crystals adhere to the annular outer surface of the hypergravity circular freezing crystallization plate. S2. Use a scraper to scrape off the ice crystals on the high-gravity circular frozen crystallization plate; S3. Using ice-water separation mechanism to separate ice crystals from concentrated brine; In step S1, a vacuum pump is first used to evacuate the sealed housing to create a vacuum environment inside the sealed housing; then, a motor is activated to drive the high-gravity circular frozen crystallization plate to rotate at high speed via the first rotating shaft, thereby forming a high-gravity field; The seawater is sprayed onto the outer surface of the high-gravity circular frozen crystallization plate through the seawater nozzle. The seawater is sprayed onto the hydrophilic membrane of the high-gravity circular frozen crystallization plate to form a brine liquid film, which exchanges heat with the refrigerant in the high-gravity circular frozen crystallization plate, and the seawater solidifies into ice crystals. As seawater solidifies into ice crystals, the concentrated brine overcomes surface tension and capillary adhesion and is thrown out.

8. The method according to claim 7, characterized in that In step S3, the ice crystals scraped off by the scraper fall into the ice crystal filter of the ice-water separation mechanism, where the ice crystals are washed with fresh water and the concentrated brine on the surface of the ice crystals is rinsed; at the same time, the ice crystal filter drives the ice crystals to rotate, and the centrifugal force generated during the rotation realizes the separation of the ice crystals and the concentrated brine; the ice crystals finally obtained are desalinated seawater.

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