Solar seawater desalination device

Abstract

The invention relates to a solar seawater desalination plant, and relates to the technical field of seawater desalination, the solar seawater desalination plant comprises a raw water temporary storage tank, an evaporation tank and a fresh water storage tank, the evaporation tank is arranged at the upper part of the raw water temporary storage tank, an evaporation assembly and a collection assembly are arranged on the evaporation tank, and a flow guide assembly is arranged in the raw water temporary storage tank; the flow guiding assembly is connected with the collecting assembly and used for guiding condensate water to the fresh water storage tank. Seawater to be treated is guided into the raw water temporary storage tank, the water level rises to the evaporation tank, the evaporation assembly is started, condensed water formed after evaporation of the seawater is collected by the collection assembly, and the collected condensed water is guided to the fresh water storage tank through the flow guide assembly, so that condensation desalination of the seawater is realized, and a vacuum pump and a pressurizing device are not needed; the flow guide assembly is arranged in the raw water temporary storage tank, so that heat of condensed fresh water can remain in the raw water temporary storage tank to preheat the seawater to be treated, energy consumption and heat loss are reduced, and subsequent seawater evaporation and condensation efficiency is improved.

Description

Technical Field

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

[0002] Seawater desalination is currently the main means to alleviate the shortage of fresh water resources. Compared with traditional seawater desalination technology, solar interfacial evaporation technology has simple equipment, low price, no need to consume fossil energy, and is green and environmentally friendly. In recent years, it has been considered as one of the most promising technologies to replace traditional seawater desalination technology. Although solar interfacial evaporation technology consumes less energy, it produces less water than other technologies. Since the water production of solar interfacial evaporation technology is positively correlated with the evaporation rate, many scholars have focused their research on how to synthesize photothermal conversion materials with high evaporation rates, but have not paid enough attention to the improvement of solar interfacial evaporation devices, resulting in low water production efficiency of existing solar interfacial evaporation devices.

[0003] In the related technology, reference can be made to the Chinese utility model patent with authorization announcement number CN220597099U, which discloses a solar seawater desalination device based on interface evaporation, including a solar interface evaporation device, a pressurized condensation device, a water delivery device and a water storage device. The solar interface evaporation device uses solar energy to evaporate seawater to form water vapor, the pressurized condensation device condenses the water vapor into water and sends it into a fresh water storage tank for storage, the water delivery device delivers seawater into an evaporation water tank and a seawater storage tank, and delivers wastewater into a wastewater tank, and the water delivery and storage device stores the desalinated seawater; a low-pressure environment is created by a vacuum pump to reduce evaporation conditions, and interface evaporation technology is used to improve solar energy utilization, accelerate the evaporation of seawater into water vapor, use a pressurized fan to reduce condensation conditions, and use a condenser to condense water vapor and exchange heat with seawater, thereby improving the efficiency of seawater desalination.

[0004] With respect to the above-mentioned related technologies, the inventors found that there are the following defects: although the desalination efficiency of seawater is improved by a vacuum pump and a pressurizing device, this method increases energy consumption while improving the desalination efficiency; its water vapor transmission channel is long and directly exposed to the outside air, which also increases heat loss. Summary of the invention

[0005] In order to improve the efficiency of seawater desalination and reduce energy consumption and heat loss, the present application provides a solar seawater desalination device.

[0006] The solar desalination device provided in this application adopts the following technical solution:

[0007] A solar seawater desalination device comprises a raw water temporary storage box, an evaporation box and a fresh water storage box, wherein the evaporation box is arranged on the upper part of the raw water temporary storage box, the evaporation box is provided with an evaporation component, the evaporation box is also provided with a collection component for collecting condensed water, the raw water temporary storage box is provided with a diversion component, the diversion component is connected to the collection component and is used to divert the condensed water to the fresh water storage tank.

[0008] By adopting the above technical scheme, the seawater to be treated is introduced into the raw water temporary storage tank, the water level rises to the evaporation tank, the evaporation component is started, and the condensed water formed after the evaporation of the seawater is collected by the collection component. The collected condensed water is guided to the fresh water storage tank through the diversion component. The fresh water storage tank stores the condensed fresh water, thereby realizing the condensation and desalination of seawater. There is no need to set up a vacuum pump and a pressurizing device. The diversion component is arranged in the raw water temporary storage tank, so the heat of the fresh water after condensation will remain in the raw water temporary storage tank to preheat the seawater to be treated, thereby reducing energy consumption and heat loss, and improving the efficiency of subsequent seawater evaporation and condensation.

[0009] Optionally, the upper end of the raw water temporary storage box is open and communicated with the interior of the evaporation box, and the evaporation component includes:

[0010] A light collecting cover plate, which is arranged at the top of the evaporation box and is arc-shaped with the concave surface facing upwards;

[0011] The light-absorbing evaporation component is arranged in the raw water temporary storage box and floats on the water surface. The light-absorbing evaporation component is located below the light-collecting cover plate.

[0012] By adopting the above technical solution, the focusing cover plate focuses sunlight onto the light-absorbing evaporation element, and the water absorbs heat through the light-absorbing evaporation element and evaporates into water vapor. The water vapor rises and contacts the focusing cover plate or the inner wall of the evaporation box and then condenses. The collecting component collects the condensed water, thereby realizing the evaporation and condensation of seawater. The arc-shaped focusing cover plate improves the concentration and utilization of sunlight, and cooperates with the light-absorbing evaporation element to improve the desalination efficiency of seawater.

[0013] Optionally, the collection component includes:

[0014] A collecting baffle, the collecting baffle is annular and coaxially arranged in the evaporation box, the lower end of the collecting baffle is connected to the raw water temporary storage box as a whole, the collecting baffle divides the evaporation box into a collecting space and an evaporation space, the collecting space is located between the inner wall of the evaporation box and the collecting baffle, and the light absorbing evaporation element is arranged in the evaporation space;

[0015] A cross tube, which is arranged in the evaporation space and communicates with the collection space;

[0016] The collecting tube is fixed at the center of the cross tube and extends upward, and the top of the collecting tube is located directly below the lowest point of the focusing cover plate.

[0017] By adopting the above technical solution, a part of the water vapor adheres to the focusing cover plate, gathers to the lowest point of the focusing cover plate under the action of gravity after condensation, and then drips into the collecting tube and merges into the cross tube. The other part of the water vapor condenses after contacting the inner wall of the evaporation box, and gathers in the collecting space and merges into the cross tube after condensation. The guide component guides the condensed water in the cross tube to the fresh water storage tank for storage, thereby realizing the collection of condensed water after condensation, and improving the collection efficiency of condensed water through the central collection tube and the surrounding annular collection space, reducing the probability of condensed water adversely affecting the subsequent evaporation and condensation of seawater, thereby improving the efficiency of seawater desalination.

[0018] Optionally, the flow guide component includes:

[0019] A gradient flow guide pipe, which is arranged in the raw water temporary storage box and is connected to the cross pipe;

[0020] The spiral tube is arranged in the raw water temporary storage tank, the top of the spiral tube is connected with the gradient guide tube, the spiral tube extends downward and the bottom end is connected with the fresh water storage tank through a connecting pipe.

[0021] By adopting the above technical solution, the condensed water in the cross tube is guided by the gradient guide tube and the spiral tube and then enters the fresh water storage tank through the connecting pipe for storage. The spiral tube contacts the seawater in the raw water temporary storage tank, so that the waste heat during the condensation of water vapor heats the water body, thereby improving the condensation efficiency of the device while reducing energy consumption and heat loss.

[0022] Optionally, a heat-insulating component is provided on the evaporator.

[0023] By adopting the above technical solution, the heat-insulating component can insulate the evaporator box and reduce heat loss.

[0024] Optionally, the focusing cover plate is a high-transmittance glass plate or a transparent acrylic plate.

[0025] By adopting the above technical solution, the material of the focusing cover plate is optimized to improve the collection and utilization of sunlight.

[0026] Optionally, the light-absorbing evaporation element is a polyurethane sponge material modified by polypyrrole.

[0027] By adopting the above technical scheme, the polyurethane sponge material has low cost, a through-hole sponge structure that is convenient for conveying water, and excellent thermal insulation performance. Polypyrrole, an amorphous polymer material with a conjugated structure, has excellent electrical conductivity, excellent light absorption and heat conversion capabilities, and is a new choice for preparing photothermal conversion materials. Compared with inorganic materials, polypyrrole has better compatibility with polymer materials, and pyrrole monomers can be in situ polymerized on a carrier, so the composite material prepared by its modification is more stable and reliable. The polyurethane sponge material modified with polypyrrole combines the properties of polyurethane sponge material and pyrrole, and is an excellent photothermal conversion material. Compared with ordinary sponge materials, the efficiency of seawater evaporation and desalination is improved.

[0028] Optionally, the polyurethane sponge material is divided into four parts and respectively inserted into four spaces surrounded by the cross tube and the collecting partition.

[0029] By adopting the above technical solution, four parts of polyurethane sponge material are respectively inserted into the four spaces surrounded by the cross tube and the collecting partition, so that the bottom is in contact with the water surface, thereby increasing the contact area with seawater, thereby improving the transportation and evaporation effect of seawater.

[0030] Optionally, the number of spiral turns of the spiral tube is not less than three.

[0031] By adopting the above technical solution, the number of spiral turns is increased to increase the contact area between the spiral tube and the seawater to be treated, so that the spiral tube with condensed water vapor can fully contact the water in the raw water storage tank, so that the waste heat when the water vapor is condensed can heat the water body, thereby improving the condensation efficiency of the device.

[0032] Optionally, the heat-insulating component is a heat-insulating sponge, and the heat-insulating sponge is arranged around the outer wall of the evaporator box.

[0033] By adopting the above technical solution, the cost of the thermal insulation sponge is low and it is easy to install. By wrapping the evaporator box with the thermal insulation sponge, the heat loss is reduced, thereby improving the evaporation and condensation efficiency of seawater.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The seawater to be treated is introduced into the raw water temporary storage tank, the water level rises to the evaporation tank, the evaporation component is started, and the condensed water formed after the evaporation of the seawater is collected by the collection component. The collected condensed water is guided to the fresh water storage tank through the diversion component. The fresh water storage tank stores the condensed fresh water, thereby realizing the condensation and desalination of seawater. There is no need to set up a vacuum pump and a pressurizing device. The diversion component is arranged in the raw water temporary storage tank, so the heat of the condensed fresh water will remain in the raw water temporary storage tank to preheat the seawater to be treated, thereby reducing energy consumption and heat loss, and improving the efficiency of subsequent seawater evaporation and condensation.

[0036] 2. The focusing cover focuses sunlight onto the light-absorbing evaporation element. Water absorbs heat through the light-absorbing evaporation element and evaporates into water vapor. The insulation element insulates the evaporation box to reduce heat loss. Part of the water vapor adheres to the focusing cover. After condensation, it gathers to the lowest point of the focusing cover under the action of gravity, and then drips into the collection tube and merges into the cross tube. The other part of the water vapor condenses after contacting the inner wall of the evaporation box. After condensation, it gathers in the collection space and merges into the cross tube. The collection efficiency of condensed water is improved through the central collection tube and the surrounding annular collection space, reducing the probability of condensed water having an adverse effect on subsequent seawater evaporation and condensation, thereby improving the efficiency of seawater desalination.

[0037] 3. The condensed water in the cross tube is guided by the gradient guide tube and the spiral tube and then enters the fresh water storage tank through the connecting pipe. The spiral tube contacts the seawater in the raw water temporary storage tank, so that the waste heat from the condensation of water vapor heats the water body, thereby reducing energy consumption and heat loss while improving the condensation efficiency of the device, thereby improving the overall heat utilization of the device.

[0038] 4. The overall device is simple and easy to install. During use, it only needs to use solar energy, and there is no need to forcibly add ventilation devices in the device. Therefore, it can realize fully automatic seawater desalination in some power-deficient areas. Therefore, the device has a wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a front view of the seawater desalination device in the present application;

[0040] Figure 2 is a side view of the seawater desalination device in the present application;

[0041] Figure 3 It is a top view of the seawater desalination device in this application.

[0042] Figure numerals: 1. Raw water temporary storage box; 2. Evaporation box; 21. Water inlet pipe; 22. Insulation component; 23. Collection space; 24. Evaporation space; 3. Fresh water storage tank; 31. Water outlet pipe; 32. Connecting pipe; 4. Evaporation component; 41. Focusing cover plate; 42. Light-absorbing evaporation component; 5. Collection component; 51. Collection partition; 52. Cross pipe; 53. Collection pipe; 6. Guide component; 61. Gradient guide pipe; 62. Spiral pipe. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-3 This application is described in further detail.

[0044] The embodiment of the present application discloses a solar seawater desalination device.

[0045] Reference Figure 1and Figure 2 A solar seawater desalination device comprises a raw water temporary storage box 1, an evaporation box 2 and a fresh water storage box 3. The evaporation box 2 is arranged on the upper part of the raw water temporary storage box 1. The evaporation box 2 is provided with an evaporation component 4. The evaporation box 2 is also provided with a collecting component 5 for collecting condensed water. A diversion component 6 is provided in the raw water temporary storage box 1. The diversion component 6 is connected to the collecting component 5 and is used to divert the condensed water to the fresh water storage tank 3.

[0046] Reference Figure 1 and Figure 3 In the present application, the raw water temporary storage tank 1, the evaporation tank 2 and the fresh water storage tank 3 are all cylindrical and their axes coincide. In other feasible embodiments, the raw water temporary storage tank 1, the evaporation tank 2 and the fresh water storage tank 3 can be other shapes, which is not limited in the present application.

[0047] Reference Figure 1 and Figure 2 The upper end of the raw water temporary storage box 1 is open and the lower end is sealed. The upper and lower ends of the evaporation box 2 are both open. The upper end of the raw water temporary storage box 1 is connected to the lower end of the evaporation box 2. An inlet pipe 21 for introducing seawater is provided on the outer wall of the evaporation box 2. The inlet pipe 21 extends horizontally into the evaporation box 2 and then extends vertically downward and into the raw water temporary storage box 1.

[0048] Reference Figure 1 and Figure 2 The evaporation assembly 4 is used to evaporate seawater. The evaporation assembly 4 includes a focusing cover plate 41 and a light-absorbing evaporation element 42. The focusing cover plate 41 is covered on the top of the evaporation box 2. The focusing cover plate 41 is arc-shaped with the concave surface facing upward. In this embodiment, the focusing cover plate 41 is a highly light-transmitting glass plate. In other embodiments, the focusing cover plate 41 can also be a transparent acrylic plate or other light-transmitting focusing plate material. The outer edge of the focusing cover plate 41 and the top of the evaporation box 2 can be connected by bolts or other detachable means.

[0049] Reference Figure 1 and Figure 2 The light-absorbing evaporation component 42 is arranged in the raw water temporary storage box 1 and floats on the water surface. The light-absorbing evaporation component 42 is located below the focusing cover plate 41, and the bottom end of the water inlet pipe 21 is located below the light-absorbing evaporation component 42. The evaporation box 2 is also provided with a heat-insulating component 22, which is a heat-insulating sponge. The heat-insulating sponge is arranged around the outer wall of the evaporation box 2.

[0050] In the embodiment of the present application, the light-absorbing evaporation element 42 is a polyurethane sponge material modified with polypyrrole, and the preparation method is as follows: first immerse the polyurethane sponge in a 5% concentration of pyrrole solution for 8 hours, then take it out and dry it, repeat the operation 3-5 times, and then immerse it in a 2% concentration of ferric chloride solution for 8 hours, take it out and dry it, and you can get a polypyrrole@polyurethane sponge. The reagents and equipment used in the preparation are all conventional products that can be purchased commercially. Other specific conditions not specified are carried out according to conventional conditions or conditions recommended by the manufacturer; in other feasible embodiments, the light-absorbing evaporation element 42 can also be replaced by other photothermal evaporation materials, such as carbon-based photothermal aerogels, carbon-based biomass materials, carbon-based photothermal water gels, etc.

[0051] Reference Figure 1 , Figure 2 and Figure 3 The collecting assembly 5 includes a collecting baffle 51, a cross tube 52 and a collecting tube 53. The collecting baffle 51 is annular and coaxially arranged in the evaporation box 2. The lower end of the collecting baffle 51 is connected to the inner wall of the raw water temporary storage box 1 as a whole. The collecting baffle 51 divides the evaporation box 2 into a collecting space 23 and an evaporation space 24. The collecting space 23 is located between the inner wall of the evaporation box 2 and the collecting baffle 51. The light-absorbing evaporation element 42 is arranged in the evaporation space 24.

[0052] Reference Figure 1 , Figure 2 and Figure 3 The cross tube 52 is arranged in the evaporation space 24 and is connected with the collecting space 23. The polyurethane sponge material is divided into four parts and is respectively inserted into the four spaces surrounded by the cross tube 52 and the collecting partition 51. The outer surface of the polyurethane sponge material is in conflict with the inner wall of the collecting partition 51. The collecting tube 53 is fixed at the center of the cross tube 52 and extends upward. The top of the collecting tube 53 is located directly below the lowest point of the focusing cover 41.

[0053] Reference Figure 1 , Figure 2 and Figure 3 , seawater is introduced into the raw water temporary storage box 1 through the water inlet pipe 21, and the water level rises to the evaporation box 2. The focusing cover 41 focuses sunlight on the light-absorbing evaporation component 42, and the water absorbs heat through the light-absorbing evaporation component 42 and evaporates into water vapor. The insulation component 22 insulates the evaporation box 2 to reduce heat loss. Part of the water vapor adheres to the focusing cover 41, and after condensation, it gathers to the lowest point of the focusing cover 41 under the action of gravity, and then drips into the collection pipe 53 and merges into the cross tube 52. Another part of the water vapor condenses after contacting the inner wall of the evaporation box 2. After condensation, it gathers in the collection space 23 and merges into the cross tube 52. The collection efficiency of condensed water is improved through the central collection pipe 53 and the surrounding annular collection space 23, and the probability of condensed water adversely affecting the subsequent evaporation and condensation of seawater is reduced, thereby improving the efficiency of seawater desalination.

[0054] Reference Figure 1 , Figure 2 and Figure 3 The fresh water storage tank 3 is located directly below the raw water temporary storage tank 1. An outlet pipe 31 for conducting fresh water is provided on the outer wall of the fresh water storage tank 3. The guide assembly 6 is used to guide the condensed water in the cross pipe 52 to the odd storage tank.

[0055] Reference Figure 1 , Figure 2 and Figure 3 The flow guide component 6 includes a gradient flow guide pipe 61 and a spiral tube 62. The gradient flow guide pipe 61 is arranged in the raw water temporary storage tank 1 and is connected to the cross tube 52. The spiral tube 62 is arranged in the raw water temporary storage tank 1. The top of the spiral tube 62 is connected to the gradient flow guide pipe 61. The spiral tube 62 extends downward in a spiral and the bottom end is connected to the fresh water storage tank 3 through the connecting pipe 32. The number of spiral turns of the spiral tube 62 is not less than three turns.

[0056] Reference Figure 1 and Figure 2 The condensed water in the cross tube 52 is guided by the gradient guide tube 61 and the spiral tube 62 and then enters the fresh water storage tank 3 through the connecting tube 32 for storage. The spiral tube 62 contacts the seawater in the raw water temporary storage tank 1, so that the waste heat during the condensation of the water vapor heats the water body, thereby reducing energy consumption and heat loss while improving the condensation efficiency of the device, thereby improving the overall heat utilization of the device, and thus improving the efficiency of seawater desalination.

[0057] The working principle of the embodiment of the present application is as follows:

[0058] The focusing cover plate 41 focuses sunlight onto the light-absorbing evaporation element 42, and the water absorbs heat through the light-absorbing evaporation element 42 and evaporates to become water vapor. A part of the water vapor adheres to the focusing cover plate 41, and after condensation, it gathers at the lowest point of the focusing cover plate 41 under the action of gravity, and then drips into the collecting pipe 53 and merges into the cross tube 52. Another part of the water vapor condenses after contacting the inner wall of the evaporation box 2, and after condensation, it gathers in the collecting space 23 and merges into the cross tube 52. The collection efficiency of condensed water is improved by the central collecting pipe 53 and the surrounding annular collecting space 23, and the probability of condensed water causing adverse effects on subsequent seawater evaporation and condensation is reduced. The condensed water in the cross tube 52 is guided by the gradient guide pipe 61 and the spiral tube 62, and then enters the fresh water storage tank 3 through the connecting pipe 32 for storage. The spiral tube 62 contacts the seawater in the raw water temporary storage tank 1, so that the waste heat during the condensation of the water vapor heats the water body, thereby improving the condensation efficiency of the device while reducing energy consumption and heat loss, thereby improving the overall heat utilization of the device, and thus improving the efficiency of seawater desalination.

[0059] The heat preservation member 22 wraps the evaporation box 2, thereby improving the sealing of the device and preventing the outer wall of the evaporation box 2 from directly contacting the air, thereby reducing the probability of the heat released during the condensation of water vapor being lost to the air through the outside of the evaporation box 2, thereby reducing heat loss and improving the overall heat utilization rate of the seawater desalination device.

[0060] The overall device is simple and easy to install. The light-absorbing evaporation component 42 can be replaced after removing the focusing cover 41. During use, only solar energy is needed, and there is no need to forcibly add ventilation devices in the device. Therefore, seawater desalination can be achieved in some power-deficient areas, thereby improving the applicability of the seawater desalination device.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A solar seawater desalination device, characterized in that: The invention comprises a raw water temporary storage box (1), an evaporation box (2) and a fresh water storage box (3); the evaporation box (2) is arranged on the upper part of the raw water temporary storage box (1); an evaporation component (4) is arranged on the evaporation box (2); a collection component (5) for collecting condensed water is also arranged on the evaporation box (2); a flow guide component (6) is arranged in the raw water temporary storage box (1); the flow guide component (6) is connected to the collection component (5) and is used to guide the condensed water to the fresh water storage tank (3).

2. The solar desalination device according to claim 1, characterized in that: The upper end of the raw water temporary storage box (1) is open and communicates with the interior of the evaporation box (2). The evaporation component (4) comprises: A light-collecting cover plate (41), the light-collecting cover plate (41) being arranged at the top of the evaporation box (2), the light-collecting cover plate (41) being arc-shaped with the concave surface facing upwards; A light-absorbing evaporation element (42), wherein the light-absorbing evaporation element (42) is arranged in the raw water temporary storage box (1) and floats on the water surface; the light-absorbing evaporation element (42) is located below the light-collecting cover plate (41).

3. The solar desalination device according to claim 2, characterized in that: The collecting component (5) comprises: a collecting baffle (51), the collecting baffle (51) being annular and coaxially arranged in the evaporation box (2), the lower end of the collecting baffle (51) being integrally connected to the raw water temporary storage box (1), the collecting baffle (51) dividing the evaporation box (2) into a collecting space (23) and an evaporation space (24), the collecting space (23) being located between the inner wall of the evaporation box (2) and the collecting baffle (51), and the light absorbing evaporation element (42) being arranged in the evaporation space (24); A cross tube (52), the cross tube (52) being arranged in the evaporation space (24) and communicating with the collection space (23); A collecting tube (53), wherein the collecting tube (53) is fixedly arranged at the center of the cross tube (52) and extends upward, and the top end of the collecting tube (53) is located directly below the lowest point of the focusing cover plate (41).

4. The solar seawater desalination device according to claim 3, characterized in that: The flow guide component (6) comprises: A gradient flow guide pipe (61), wherein the gradient flow guide pipe (61) is arranged in the raw water temporary storage box (1) and is connected to the cross pipe (52); A spiral tube (62), the spiral tube (62) is arranged in the raw water temporary storage tank (1), the top end of the spiral tube (62) is connected to the gradient guide tube (61), the spiral tube (62) extends downward in a spiral and the bottom end is connected to the fresh water storage tank (3) through a connecting pipe (32).

5. The solar seawater desalination device according to claim 3, characterized in that: The evaporation box (2) is provided with a heat-insulating component (22).

6. The solar desalination device according to claim 2, characterized in that: The light-collecting cover plate (41) is a high-light-transmittance glass plate or a transparent acrylic plate.

7. The solar seawater desalination device according to claim 3, characterized in that: The light-absorbing evaporation element (42) is a polyurethane sponge material modified by polypyrrole.

8. The solar seawater desalination device according to claim 7, characterized in that: The polyurethane sponge material is divided into four parts and is respectively inserted into four spaces surrounded by the cross tube (52) and the collecting partition (51).

9. The solar seawater desalination device according to claim 4, characterized in that: The number of spiral turns of the spiral tube (62) is not less than three.

10. The solar seawater desalination device according to claim 5, characterized in that: The heat-insulating component (22) is a heat-insulating sponge, and the heat-insulating sponge is arranged around the outer wall of the evaporation box (2).

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