Solar desalination equipment and use method

Abstract

The invention discloses a solar seawater desalination device and a method for using the same. The device uses a filter on a seawater inlet pipe to filter seawater. The filtered seawater enters a cooling water tank, where it can be heated by sunlight on the one hand, and condensed to absorb heat on the other hand. The seawater in the cooling water tank enters a seawater holding tank through a connecting pipe, where the seawater is preheated by a preheating mechanism on the connecting pipe. A cleaning component arranged in the preheating mechanism can reduce the precipitation and adhesion of impurities formed when the seawater is heated in the preheating mechanism, thereby avoiding affecting the heat transfer effect of the preheating mechanism and thus reducing energy consumption. The preheated seawater enters the seawater holding tank and is heated by a heating device. A scraping mechanism is arranged in the seawater holding tank, thereby avoiding salt crystals generated by evaporation of seawater from adhering to the bottom of a shell, thereby preventing the formation of a salt cover that blocks heat, thereby helping to reduce energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater desalination, and in particular to a solar seawater desalination device and a use method thereof. Background Art

[0002] Seawater desalination equipment refers to equipment specifically used to desalinate seawater. There are two main methods of desalinating seawater, namely distillation and reverse osmosis.

[0003] In large-scale seawater desalination treatment and places with abundant thermal energy, distillation is currently the main method used to desalinate seawater. However, due to the presence of impurities in seawater, direct heating of the seawater will cause part of the heat to be absorbed by the remaining impurities that are out of the essence of distillation, which will result in a certain amount of energy waste in the distillation of seawater. At the same time, at the position where the heating device contacts the seawater, the salt crystals produced by the evaporation of seawater will adhere to the surface of the heating device. After long-term use, the salt cover produced will block the heat, further leading to an increase in heating energy consumption. Summary of the invention

[0004] The purpose of the present invention is to provide a solar seawater desalination device and a method of use to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides a solar seawater desalination device, comprising a shell, the top of the shell is a conical structure, a seawater holding tank and a fresh water holding tank are arranged inside the shell, the seawater holding tank is coaxially arranged with the fresh water holding tank, and the fresh water holding tank is arranged outside the seawater holding tank, and a scraping mechanism is arranged inside the seawater holding tank; an annular retaining ring is fixedly connected to the top of the shell, a cooling water tank is formed between the annular retaining ring and the shell, a seawater inlet pipe and a connecting pipe are connected to the annular retaining ring, and the end of the connecting pipe is connected to the seawater inlet pipe. The shell is connected to a water holding tank, a filter for filtering seawater is installed on the seawater inlet pipe, a preheating mechanism connected to the solar power generation device is installed on the connecting pipe, a cleaning component is arranged inside the preheating mechanism, and the cleaning component is used to clean the inner wall of the preheating mechanism; a fresh water outlet pipe and a seawater outlet pipe are connected to the shell, the seawater outlet pipe is connected to the seawater holding tank, and the fresh water outlet pipe is connected to the fresh water holding tank; a heating device is arranged at the bottom of the shell, and the heating device is used to heat the seawater in the seawater holding tank.

[0006] Preferably, the scraping mechanism includes a rotating shaft rotatably connected to the middle of the inner bottom plate of the shell, a scraping assembly is fixedly connected to the side wall of the rotating shaft, a collecting groove is opened on the inner bottom plate of the shell, and the seawater outlet pipe is connected to the collecting groove; a mounting plate is fixedly connected to the inner wall of the shell, a motor 1 is fixedly connected to the bottom end of the mounting plate, and the output shaft of the motor 1 is coaxially fixedly arranged with the rotating shaft.

[0007] Preferably, the scraping assembly includes an arc-shaped scraper fixed on the side wall of the rotating shaft, a plurality of grooves are opened at the bottom end of the arc-shaped scraper, a plurality of scraping heads are formed at the bottom of the arc-shaped scraper through the grooves, and the scraping heads are of a plow-shaped structure; a wedge-shaped scraper is also fixedly connected to the side wall of the rotating shaft, and the distance between one end of the wedge-shaped scraper away from the rotating shaft and the other end of the arc-shaped scraper away from the rotating shaft is adapted to the collecting trough.

[0008] Preferably, the preheating mechanism includes a preheating cylinder connected to the connecting pipe, and the cleaning assembly is arranged in the preheating cylinder; a heat-reflecting cover is provided on the outer side of the preheating cylinder, and a heating chamber is formed between the heat-reflecting cover and the preheating cylinder; an electric heater is installed on the outer wall of the preheating cylinder, and the solar power generation device is used to supply power to the electric heater; and an insulation layer is provided on the outer side of the heat-reflecting cover.

[0009] Preferably, one end of the preheating cylinder is an open end, a filter box is fixedly installed on the open end of the preheating cylinder, and a filter element is detachably connected to the end of the filter box away from the preheating cylinder; the cleaning assembly includes a horizontal axis, a support seat is fixedly connected to the inner wall of the preheating cylinder, the horizontal axis is rotatably connected to the inner wall of the preheating cylinder through the support seat, a brush plate is fixedly connected to the horizontal axis, and the brush plate is in contact with and cooperates with the inner wall of the preheating cylinder; one end of the horizontal axis is fixedly connected to motor 2, the motor 2 is located in the filter box, and the motor 2 is fixedly installed on the support seat.

[0010] Preferably, a preheating tank is sleeved on the connecting pipe, the preheating tank is located at the water inlet end of the preheating cylinder, a pump is installed on the seawater outlet pipe, and the seawater outlet pipe is connected to the preheating tank.

[0011] Preferably, the heating device includes a heat-insulating cover fixedly mounted on the bottom end of the shell, the heat-insulating cover is filled with heat storage material, a heating component is arranged between the heat storage material and the shell, and the heating component is one of electric heater 2 or solar separation heat pipe; when the heating component is electric heater 2, the heating component is electrically connected to the solar power generation device.

[0012] Preferably, a plurality of diversion nozzles are installed at the bottom of one end of the connecting pipe located in the seawater holding tank.

[0013] Preferably, the top of the shell is a transparent structure, and a hydrophobic coating is provided on the inner wall of the top of the shell.

[0014] A method for using a solar desalination device comprises the following steps:

[0015] S1. Installation of equipment;

[0016] S2, filtering the seawater using a filter on the seawater inlet pipe;

[0017] S3, the filtered seawater is preheated by a preheating mechanism on the connecting pipe;

[0018] S4, the preheated seawater enters the seawater holding tank for desalination treatment. After the seawater is desalinated in the seawater holding tank, it is discharged through the seawater outlet pipe, and the fresh water collected in the fresh water holding tank is discharged through the fresh water outlet pipe;

[0019] S5. Repeat the above steps S2-S4.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The solar desalination equipment provided by the present invention uses a filter on a seawater inlet pipe to filter seawater; the filtered seawater enters a cooling water tank, where it can be heated by sunlight on the one hand, and can be condensed to absorb heat after the seawater evaporates on the other hand. During this process, the temperature of the seawater in the cooling water tank tends to rise continuously, and then the seawater in the cooling water tank enters a seawater holding tank through a connecting pipe, and the seawater can be preheated by a preheating mechanism on the connecting pipe. A cleaning component arranged in the preheating mechanism can reduce the precipitation and attachment of impurities formed when the seawater is heated in the preheating mechanism, and avoid affecting the heat transfer effect of the preheating mechanism, thereby reducing energy consumption; the preheated seawater enters the seawater holding tank and is heated by a heating device, and the water vapor generated by the heating is condensed on the top of the shell and converges into the fresh water holding tank. By arranging a scraping mechanism in the seawater holding tank, it can be avoided that the salt crystals generated by the evaporation of the seawater are attached to the bottom of the shell, and the salt cover generated is prevented from blocking the heat, thereby helping to reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1It is a structural schematic diagram of the solar seawater desalination equipment of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of the solar seawater desalination equipment of the present invention;

[0025] Figure 3 It is a schematic diagram of the internal structure of the preheating mechanism of the present invention;

[0026] In the figure: 1. shell; 2. seawater holding tank; 3. fresh water holding tank; 4. annular retaining ring; 5. seawater inlet pipe; 6. connecting pipe; 7. filter; 8. fresh water outlet pipe; 9. seawater outlet pipe; 10. rotating shaft; 11. collecting tank; 12. mounting plate; 13. motor 1; 14. arc scraper; 15. wedge scraper; 16. preheating cylinder; 17. anti-heat cover; 18. electric heater 1; 19. filter box; 20. filter element; 21. horizontal axis; 22. support seat; 23. brush plate; 24. motor 2; 25. preheating tank; 26. insulation cover; 27. electric heater 2; 28. diverter nozzle. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] like Figures 1 to 3 As shown, the present invention provides a solar seawater desalination device, including a shell 1, the top of the shell 1 is a conical structure, a seawater holding tank 2 and a freshwater holding tank 3 are arranged inside the shell 1, the seawater holding tank 2 and the freshwater holding tank 3 are arranged coaxially, and the freshwater holding tank 3 is arranged outside the seawater holding tank 2, and a scraping mechanism is arranged inside the seawater holding tank 2; an annular retaining ring 4 is fixedly connected to the top of the shell 1, a cooling water tank is formed between the annular retaining ring 4 and the shell 1, a seawater inlet pipe 5 and a connecting pipe 6 are connected to the annular retaining ring 4, and the end of the connecting pipe 6 is connected to the seawater inlet pipe 5 and the connecting pipe 6. The shell 1 is connected to the water holding tank 2, a filter 7 for filtering seawater is installed on the seawater inlet pipe 5, a preheating mechanism connected to the solar power generation device is installed on the connecting pipe 6, and a cleaning component is arranged inside the preheating mechanism, and the cleaning component is used to clean the inner wall of the preheating mechanism; a fresh water outlet pipe 8 and a seawater outlet pipe 9 are connected to the shell 1, the seawater outlet pipe 9 is connected to the seawater holding tank 2, and the fresh water outlet pipe 8 is connected to the fresh water holding tank 3; a heating device is arranged at the bottom of the shell 1, and the heating device is used to heat the seawater in the seawater holding tank 2.

[0029] When the present invention is used, first, the seawater is filtered by the filter 7 on the seawater inlet pipe 5; the filtered seawater enters the cooling water tank, where it can be heated by sunlight on the one hand, and the water vapor after evaporation of the seawater can be condensed and absorbed by heat on the other hand. In this process, the temperature of the seawater in the cooling water tank tends to rise continuously, and then the seawater in the cooling water tank enters the seawater holding tank 2 through the connecting pipe 6, and the seawater can be preheated by the preheating mechanism on the connecting pipe 6. The cleaning component provided in the preheating mechanism can reduce the precipitation of impurities formed when the seawater is heated in the preheating mechanism. The preheating mechanism can avoid affecting the heat transfer effect of the preheating mechanism, thereby reducing energy consumption; the preheated seawater enters the seawater holding tank 2 and is heated by the heating device, and the water vapor generated by the heating is condensed on the top of the shell 1 and converges into the fresh water holding tank 3. By arranging a scraping mechanism in the seawater holding tank 2, it is possible to avoid the salt crystals generated by the evaporation of seawater from adhering to the bottom of the shell 1, and prevent the formation of salt cover to block the heat, thereby helping to reduce energy consumption. After the seawater is desalinated in the seawater holding tank 2, it is discharged through the seawater outlet pipe 9, and the fresh water collected in the fresh water holding tank 3 is discharged through the fresh water outlet pipe 8.

[0030] A further optimized solution is provided. To facilitate the collection of salt crystals, the scraping mechanism includes a rotating shaft 10 rotatably connected to the middle of the inner bottom plate of the shell 1, a scraping assembly is fixedly connected to the side wall of the rotating shaft 10, a collecting tank 11 is provided on the inner bottom plate of the shell 1, and the seawater outlet pipe 9 is connected to the collecting tank 11; a mounting plate 12 is fixedly connected to the inner wall of the shell 1, a motor 13 is fixedly connected to the bottom end of the mounting plate 12, and the output shaft of the motor 13 is coaxially fixed with the rotating shaft 10.

[0031] A further optimization scheme is adopted to improve the scraping of salt crystals attached to the bottom of the shell 1. The scraping assembly includes an arc-shaped scraper 14 fixed on the side wall of the rotating shaft 10. A plurality of grooves are provided at the bottom end of the arc-shaped scraper 14. A plurality of scraping heads are formed at the bottom of the arc-shaped scraper 14 through the grooves. The scraping heads are of a plow-shaped structure. A wedge-shaped scraper 15 is also fixedly connected to the side wall of the rotating shaft 10. The distance between one end of the wedge-shaped scraper 15 away from the rotating shaft 10 and one end of the arc-shaped scraper 14 away from the rotating shaft 10 is adapted to the collecting tank 11.

[0032] A further optimization scheme is adopted to improve the preheating effect of seawater. The preheating mechanism includes a preheating tube 16 connected to the connecting pipe 6. The preheating tube 16 is made of heat-conducting ceramic material, and a cleaning component is arranged in the preheating tube 16. A heat-reflecting cover 17 is provided on the outer side of the preheating tube 16 to form a heating chamber between the heat-reflecting cover 17 and the preheating tube 16. An electric heater 18 is installed on the outer wall of the preheating tube 16, and a solar power generation device is used to power the electric heater 18. A thermal insulation layer is provided on the outer side of the heat-reflecting cover 17.

[0033] A further optimization scheme is to further reduce the impurities in the seawater entering the seawater holding tank 2 and improve the preheating effect of the seawater. One end of the preheating cylinder 16 is an open end, and a filter box 19 is fixedly installed at the open end of the preheating cylinder 16. The end of the filter box 19 away from the preheating cylinder 16 is detachably connected to a filter element 20; the cleaning component includes a horizontal axis 21, and a support seat 22 is fixedly connected to the inner wall of the preheating cylinder 16. The horizontal axis 21 is rotatably connected to the inner wall of the preheating cylinder 16 through the support seat 22. A brush plate 23 is fixedly connected to the horizontal axis 21, and the brush plate 23 contacts and cooperates with the inner wall of the preheating cylinder 16; one end of the horizontal axis 21 is fixedly connected to a motor 24, and the motor 24 is located in the filter box 19, and the motor 24 is fixedly installed on the support seat 22.

[0034] To further optimize the solution and reduce energy waste, a preheating tank 25 is provided on the connecting pipe 6 , the preheating tank 25 is located at the water inlet end of the preheating cylinder 16 , a pump is installed on the seawater outlet pipe 9 , and the seawater outlet pipe 9 is connected to the preheating tank 25 .

[0035] A further optimization scheme is to facilitate the heating of seawater in the seawater holding tank 2 and improve the utilization rate of the heat generated by the heating device. The heating device includes a heat preservation cover 26 fixedly installed at the bottom end of the shell 1. The heat preservation cover 26 is filled with heat storage material. A heating component is arranged between the heat storage material and the shell 1. The heating component is an electric heater 27 or a solar separation heat pipe. When the heating component is an electric heater 27, the heating component is electrically connected to the solar power generation device.

[0036] According to a further optimized solution, a plurality of flow diversion nozzles 28 are installed at the bottom of one end of the connecting pipe 6 located in the seawater storage tank 2 .

[0037] According to a further optimization scheme, in order to facilitate the water vapor to flow into the fresh water storage tank 3 after condensation, the top of the shell 1 is a transparent structure, and a hydrophobic coating is provided on the inner wall of the top of the shell 1.

[0038] As a further optimization scheme, in order to improve the utilization of solar heat, the inner wall of the seawater holding tank 2 is coated with a black heat-resistant coating, and the black coating is used to absorb the heat of the sunlight irradiated from the top of the shell 1, thereby assisting in heating the seawater.

[0039] A method for using a solar desalination device comprises the following steps:

[0040] S1. Installation of equipment;

[0041] S2, filtering the seawater using the filter 7 on the seawater inlet pipe 5;

[0042] S3, the filtered seawater is preheated by the preheating mechanism on the connecting pipe 6;

[0043] The filtered seawater enters the cooling water tank. On the one hand, it can be heated by sunlight in the cooling water tank. On the other hand, the water vapor after evaporation of the seawater can be condensed and absorbed. In this process, the temperature of the seawater in the cooling water tank tends to rise continuously. Then the seawater in the cooling water tank enters the seawater holding tank 2 through the connecting pipe 6. The seawater can be preheated by the preheating mechanism on the connecting pipe 6. The electricity generated by the solar power generation device is used to operate the electric heater 18. The heat generated by the electric heater 18 is heated by the preheating tube 16. At the same time, the heat generated by the electric heater 18 can be used to heat the seawater inside it. The heat is reflected to prevent the heat from dissipating, and it is helpful to concentrate the heat, so as to improve the preheating effect of the seawater. The cleaning component arranged in the preheating mechanism drives the horizontal shaft 21 to rotate through the motor 24, and the horizontal shaft 21 drives the brush plate 23 to rotate to realize the cleaning of the inner wall of the preheating cylinder 16, which can reduce the precipitation and adhesion of impurities formed when the seawater is heated in the preheating mechanism, avoid affecting the heat transfer effect of the preheating mechanism, and thus reduce energy consumption; moreover, the setting of the filter box 19 and the filter element 20 can not only filter the seawater again, but also slow down the flow speed of the seawater, so as to improve the preheating effect of the seawater;

[0044] S4, the preheated seawater enters the seawater holding tank 2 and is heated by a heating device. The water vapor generated by the heating is condensed at the top of the shell 1 and converges into the fresh water holding tank 3. A scraping mechanism is set in the seawater holding tank 2, and the motor 13 is used to drive the rotating shaft 10 to rotate. The rotating shaft 10 drives the arc scraper 14 and the wedge scraper 15 to rotate together. The scraper head on the arc scraper 14 can not only better separate the salt crystals from the shell 1, but also avoid the formation of large pieces of salt crystals. Then, the wedge scraper 15 is used to scrape the salt crystals into the collecting tank 11 for easy discharge, thereby avoiding the salt crystals generated by seawater evaporation from adhering to the bottom of the shell 1, preventing the formation of salt cover to block heat, thereby helping to reduce energy consumption. After the seawater is desalinated in the seawater holding tank 2, it is discharged through the seawater outlet pipe 9, and the fresh water collected in the fresh water holding tank 3 is discharged through the fresh water outlet pipe 8;

[0045] S5. Repeat the above steps S2-S4.

[0046] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A solar desalination device, characterized in that: The invention comprises a shell (1), the top of the shell (1) is a conical structure, a seawater holding tank (2) and a freshwater holding tank (3) are arranged inside the shell (1), the seawater holding tank (2) and the freshwater holding tank (3) are arranged coaxially, and the freshwater holding tank (3) is arranged outside the seawater holding tank (2), and a scraping mechanism is arranged inside the seawater holding tank (2); an annular retaining ring (4) is fixedly connected to the top of the shell (1), a cooling water tank is formed between the annular retaining ring (4) and the shell (1), a seawater inlet pipe (5) and a connecting pipe (6) are connected to the annular retaining ring (4), and the end of the connecting pipe (6) is connected to the seawater holding tank ( 2), the seawater inlet pipe (5) is provided with a filter (7) for filtering seawater, the connecting pipe (6) is provided with a preheating mechanism connected to the solar power generation device, the preheating mechanism is provided with a cleaning component inside, the cleaning component is used to clean the inner wall of the preheating mechanism; the shell (1) is connected with a fresh water outlet pipe (8) and a seawater outlet pipe (9), the seawater outlet pipe (9) is connected with the seawater holding tank (2), and the fresh water outlet pipe (8) is connected with the fresh water holding tank (3); the bottom of the shell (1) is provided with a heating device, the heating device is used to heat the seawater in the seawater holding tank (2); The scraping mechanism comprises a rotating shaft (10) rotatably connected to the middle of the inner bottom plate of the shell (1); a scraping assembly is fixedly connected to the side wall of the rotating shaft (10); a collecting groove (11) is provided on the inner bottom plate of the shell (1); the seawater outlet pipe (9) is in communication with the collecting groove (11); a mounting plate (12) is fixedly connected to the inner wall of the shell (1); a motor 1 (13) is fixedly connected to the bottom end of the mounting plate (12); an output shaft of the motor 1 (13) is coaxially fixedly arranged with the rotating shaft (10); The scraping assembly comprises an arc-shaped scraper (14) fixed on the side wall of the rotating shaft (10), a plurality of grooves being formed at the bottom end of the arc-shaped scraper (14), a plurality of scraping heads being formed at the bottom of the arc-shaped scraper (14) through the grooves, and the scraping heads are of a plough-shaped structure; a wedge-shaped scraper (15) is also fixedly connected to the side wall of the rotating shaft (10), and the distance between one end of the wedge-shaped scraper (15) away from the rotating shaft (10) and one end of the arc-shaped scraper (14) away from the rotating shaft (10) is adapted to the collecting trough (11); The preheating mechanism comprises a preheating cylinder (16) connected to the connecting pipe (6), and the cleaning assembly is arranged in the preheating cylinder (16); a heat-reflecting cover (17) is sleeved on the outer side of the preheating cylinder (16), and a heating chamber is formed between the heat-reflecting cover (17) and the preheating cylinder (16); an electric heater (18) is installed on the outer wall of the preheating cylinder (16), and the solar power generation device is used to supply power to the electric heater (18); and a heat-insulating layer is arranged on the outer side of the heat-reflecting cover (17); One end of the preheating cylinder (16) is an open end, a filter box (19) is fixedly mounted on the open end of the preheating cylinder (16), and an end of the filter box (19) away from the preheating cylinder (16) is detachably connected to a filter element (20); the cleaning assembly comprises a horizontal shaft (21), a support seat (22) is fixedly connected to the inner wall of the preheating cylinder (16), the horizontal shaft (21) is rotatably connected to the inner wall of the preheating cylinder (16) through the support seat (22), a brush plate (23) is fixedly connected to the horizontal shaft (21), and the brush plate (23) is in contact with the inner wall of the preheating cylinder (16); one end of the horizontal shaft (21) is fixedly connected to a second motor (24), the second motor (24) is located in the filter box (19), and the second motor (24) is fixedly mounted on the support seat (22).

2. The solar desalination equipment according to claim 1, characterized in that: A preheating tank (25) is sleeved on the connecting pipe (6), and the preheating tank (25) is located at the water inlet end of the preheating cylinder (16). A pump is installed on the seawater outlet pipe (9), and the seawater outlet pipe (9) is in communication with the preheating tank (25).

3. The solar desalination equipment according to claim 1, characterized in that: The heating device comprises a heat-insulating cover (26) fixedly mounted on the bottom end of the shell (1), the heat-insulating cover (26) being filled with a heat-storage material, a heating component being arranged between the heat-storage material and the shell (1), the heating component being one of an electric heater 2 (27) or a solar separation heat pipe; when the heating component is an electric heater 2 (27), the heating component is electrically connected to the solar power generation device.

4. The solar desalination equipment according to claim 1, characterized in that: A plurality of flow splitting nozzles (28) are installed at the bottom of one end of the connecting pipe (6) located in the seawater storage tank (2).

5. The solar desalination equipment according to claim 1, characterized in that: The top end of the shell (1) is a transparent structure, and a hydrophobic coating is provided on the inner wall of the top end of the shell (1).

6. A method for using the solar desalination equipment according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Installation of equipment; S2, filtering the seawater using the filter (7) on the seawater inlet pipe (5); S3, the filtered seawater is preheated by a preheating mechanism on the connecting pipe (6); S4, the preheated seawater enters the seawater holding tank (2) for desalination treatment. After the seawater is desalinated in the seawater holding tank (2), it is discharged through the seawater outlet pipe (9). The fresh water collected in the fresh water holding tank (3) is discharged through the fresh water outlet pipe (8); S5. Repeat the above steps S2-S4.

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