CN114105240B - Solar energy distillation sea water desalination - Google Patents

Abstract

The application provides a solar energy distillation sea water desalination system, includes: a distillation subsystem and a heat supply subsystem; the distillation subsystem includes: the system comprises a low-temperature seawater storage tank, an immersion cooling tank and a tubular distiller arranged in the immersion cooling tank; the low-temperature seawater in the low-temperature seawater storage tank enters the immersion cooling tank through a seawater pipeline and is preheated by heat emitted when the tubular distiller distills the seawater to obtain high-temperature seawater, and the high-temperature seawater enters the tubular distiller to be distilled to obtain fresh water; the heating subsystem includes: a solar heat collector and a phase-change heat storage tank; when the solar radiation is sufficient, the solar heat collector heats the heat exchange fluid in the solar heat collector, and the heated heat exchange fluid is input into the tubular distiller and the phase change heat storage tank through the heat exchange pipeline; when the sun is not sufficiently irradiated, the phase change heat storage tank inputs the stored heat exchange fluid into the tubular distiller through the heat exchange pipeline. This application can utilize the latent heat of condensation of vapor and the heat in the phase transition heat storage jar to carry out seawater desalination.

Description

A solar distillation seawater desalination system

technical field

The invention belongs to the technical field of solar energy utilization and seawater desalination, in particular to a solar distillation seawater desalination system based on phase change heat storage technology.

Background technique

In the process of marine resources development, the scarcity of fresh water has always been a development bottleneck, and desalination of seawater nearby is an ideal choice. There are many seawater desalination technologies at present, among which, compared with seawater desalination technologies such as multi-stage flash evaporation, multi-effect distillation, electrodialysis and reverse osmosis, solar seawater distillation has the advantages of low cost, simple structure and low salinity of produced water. Become a method with great development potential.

However, there are still a series of problems that cannot be ignored in the actual operation of the traditional solar distillation system: first, the latent heat of condensation of water vapor is dissipated into the environment, causing a large amount of heat loss; second, the normal operation of the system is limited by the inherent intermittent nature of solar energy. Due to the influence of fluctuations in environmental factors such as nature and weather, the water production rate is unstable; when operating under normal pressure, the gasification temperature of water is high, resulting in low water production. Therefore, it is urgent to carry out reasonable transformation on the existing solar distillation seawater desalination system to avoid unnecessary waste of heat energy, improve the stability of system operation, and increase the water production as much as possible.

Contents of the invention

In view of the problems in the prior art, the present application provides a solar distillation seawater desalination system, which can utilize the latent heat of condensation of water vapor and the heat in a phase change heat storage tank to desalinate seawater.

In order to solve the above technical problems, the application provides the following technical solutions:

In the first aspect, the present application provides a solar distillation seawater desalination system, including: a distillation subsystem and a heating subsystem;

The distillation subsystem includes: a low-temperature seawater storage tank, an immersion cooling tank, and a tubular still arranged in the immersion cooling tank;

Wherein, the low-temperature seawater in the low-temperature seawater storage tank enters the immersion cooling tank through the seawater pipeline and is preheated by the heat emitted when the seawater is distilled by the tubular still to obtain high-temperature seawater, and the high-temperature seawater enters the immersion cooling tank. Obtain fresh water after distillation in the tube still;

The heating subsystem includes: a solar collector and a phase change heat storage tank;

Wherein, when the sunlight is sufficient, the solar heat collector heats the heat exchange fluid therein, and the heated heat exchange fluid is input to the tubular distiller and the phase change heat storage tank through the heat exchange pipeline ; when the solar radiation is insufficient, the phase-change heat storage tank inputs the stored heat-exchange fluid to the tubular still through the heat-exchange pipeline.

Further, the solar distillation seawater desalination system, the distillation subsystem also includes:

A high-temperature seawater storage tank, used for storing the high-temperature seawater;

The first circulating water pump draws the high-temperature seawater from the high-temperature seawater storage tank and supplies it to the tubular still through the seawater pipeline.

Further, the solar distillation seawater desalination system, the distillation subsystem also includes:

The fresh water storage tank is connected to the tubular still through a fresh water pipeline, and is used for receiving and storing the fresh water.

Further, the solar distillation seawater desalination system, the distillation subsystem also includes:

The vacuum pump is used to maintain the negative pressure in the tubular still, the fresh water storage tank and the high-temperature seawater storage tank, so as to reduce the distillation boiling point of seawater and improve the distillation efficiency.

Further, the solar distillation seawater desalination system, the distillation subsystem also includes:

The filter is arranged on the seawater pipeline between the seawater inlet and the low-temperature seawater storage tank, and is used for preliminarily filtering impurities in the seawater.

Further, in the solar distillation seawater desalination system, the bottom of the tubular still is provided with insulation material to maintain the distillation efficiency of seawater.

Further, the solar distillation seawater desalination system, the heating subsystem also includes:

The second circulating water pump is used to input the heated heat exchange fluid to the tubular still and/or the phase change heat storage tank through the heat exchange pipeline.

Further, the solar distillation seawater desalination system also includes: a power supply subsystem, and the power supply subsystem includes:

The photovoltaic panel is used to absorb solar energy and convert the solar energy into electrical energy to drive the first circulating water pump, the second circulating water pump and the vacuum pump.

Further, the solar distillation seawater desalination system, the power supply subsystem also includes:

Power controller and battery;

Wherein, the power controller is used for inputting the electric energy into the storage battery with preset power, and the storage battery drives the first circulating water pump, the second circulating water pump and the vacuum pump.

Further, the solar distillation seawater desalination system, the power supply subsystem also includes:

The circuit switch is used to connect and/or cut off the circuit between the power controller and the storage battery.

Aiming at the problems in the prior art, the solar distillation seawater desalination system provided by this application can preheat the seawater by using the latent heat of water vapor condensation, and use the phase change heat storage tank to desalinate the tubular distillation in the distillation sub-system when the sunlight is insufficient. The vacuum pump is used to draw negative pressure to reduce the evaporation temperature of seawater to increase the water production rate. By reasonably adjusting the opening of the valve and selecting the appropriate vacuum pump and circulating water pump, the entire system is in a dynamic balance.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the general structural diagram of the solar distillation seawater desalination system in the embodiment of the present application;

Fig. 2 is an internal structure diagram of the tube still in the embodiment of the present application.

【Symbol Description】

1. Seawater inlet; 2. Valve; 3. Filter; 4. Low temperature seawater storage tank; 5. Valve; 6. Seawater inlet of immersion cooling tank; Outlet; 10. Mechanical pressure gauge; 11. Seawater outlet of immersion cooling tank; 12. Right end face of tube still; 13. Seawater outlet of immersion cooling tank; 14. Seawater inlet of tube still; 15. Overflow of tube still 16. U-shaped heat exchange tube outlet; 17. U-shaped heat exchange tube inlet; 18. Fresh water storage tank; 19. Vacuum pump; 20. High temperature seawater storage tank; 21. Circulating water pump; 22. Valve; 23. Valve; 24. Valve; 25. Solar collector; 26. Circulating water pump; 27. Valve; 28. Valve; 29. Valve; 30. Phase change heat storage tank; 31. Circuit switch; 32. Circuit switch; 33. Circuit switch 34. Battery; 35. Power controller; 36. Photovoltaic panel; 37. Water storage tank; 38. U-shaped heat exchange tube; 39. Thermal insulation material; 40. Seawater pipeline;

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some, not all, embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

In one embodiment, referring to Fig. 1, in order to utilize the latent heat of condensation of water vapor and the heat in the phase change heat storage tank for seawater desalination, the present application provides a solar distillation seawater desalination system, including: a distillation subsystem and a heating subsystem .

The distillation subsystem includes: a low-temperature seawater storage tank 4, an immersion cooling tank 8, and a tubular still 7 arranged in the immersion cooling tank 8; wherein, the low-temperature seawater in the low-temperature seawater storage tank 4 enters the immersion tank through a seawater pipeline (label) After the cooling tank 8 is preheated by the heat emitted by the tubular still 7 when the seawater is distilled, high-temperature seawater is obtained, and the high-temperature seawater enters the tubular still 7 and is distilled to obtain fresh water;

The heat supply subsystem includes: a solar heat collector 25 and a phase change heat storage tank 30; wherein, when the sun is irradiated sufficiently, the solar heat collector 25 heats the heat exchange fluid therein, and passes the heated heat exchange fluid through the heat exchange The pipeline (label) is input to the tubular still 7 and the phase change heat storage tank 30; when the sunlight is insufficient, the phase change heat storage tank 30 inputs the stored heat exchange fluid to the tubular still 7 through the heat exchange pipeline .

In an embodiment, referring to FIG. 1 , the solar distillation seawater desalination system provided by the present application further includes: a power supply system. The power supply system includes: a photovoltaic panel 36 for absorbing solar energy and converting the solar energy into electrical energy to drive the circulating water pump 21 , the circulating water pump 26 and the vacuum pump 19 .

In one embodiment, the power supply subsystem further includes: a power controller 35 and a storage battery 34; wherein, the power controller 35 is used to input electric energy into the storage battery 34 with a preset power, and the storage battery 34 drives the circulating water pump 21, the circulating water pump 26 and the storage battery 34. Vacuum pump 19.

In one embodiment, the power supply sub-system further includes: a circuit switch for switching on and/or cutting off the circuit between the power controller 35 and the battery 34 .

It can be understood that the solar distillation seawater desalination system provided by this application is realized based on phase change heat storage technology, and its distillation subsystem, heat supply subsystem and power supply subsystem are described below in detail:

① Seawater inlet 1, valve 2, filter 3, low-temperature seawater storage tank 4, valve 5, immersion cooling tank 8, tubular still 7, mechanical pressure gauge 10, fresh water storage tank 18, high-temperature seawater storage in the distillation subsystem Tank 20, several valves, pipelines (may include seawater pipelines, freshwater pipelines and air pipelines), vacuum pump 19 and circulating water pump 21 are shown in Fig. 1 and Fig. 2 .

In the distillation subsystem, low-temperature seawater flows in from the seawater inlet 1, and enters the low-temperature seawater storage tank 4 through the preliminary filtration of the filter 3 under the control of the valve 2, and enters the immersion cooling tank through the seawater inlet 6 of the immersion cooling tank under the control of the valve 5. in slot 8. Wherein, the filter 3 is arranged on the seawater pipeline 40 between the seawater inlet 1 and the low-temperature seawater storage tank 4 .

The low-temperature seawater in the immersion cooling tank 8 is preheated by the latent heat of condensation of water vapor in the tubular still 7, and the preheated seawater can flow into the high-temperature seawater storage tank 20 (for storing the preheated seawater), and then pass through the circulating water pump 21 of the pump into the tube still 7. In other words, the circulating water pump 21 draws high-temperature seawater from the high-temperature seawater storage tank 20 and inputs it to the tubular still 7 through the seawater pipeline 40 . The so-called "high-temperature seawater" here means that the temperature of the "low-temperature seawater" has increased. Finally, the high-temperature heat exchange fluid (which can be but not limited to distilled water) heats the seawater in the tubular still 7 through the U-shaped tube heat exchange located in the tubular still 7, so that the water vapor flows upwards and meets the low-temperature top. The latent heat is rapidly released, condensed into liquid, and the formed fresh water enters the fresh water storage tank 18 through the tank wall through the action of gravity for storage, thereby completing the seawater desalination process. Wherein, the fresh water storage tank 18 is connected to the tube still 7 through a fresh water pipeline 41 .

In one embodiment, an insulating material is provided at the bottom of the tube still 7 to maintain the temperature of the tube still 7 and further maintain the distillation efficiency of seawater. In addition, when there is too much seawater in the tubular distiller 7 , the seawater therein will flow back into the high-temperature seawater storage tank 20 through the overflow port 15 . The vacuum pump 19 can maintain the negative pressure in the tubular distiller 7, the fresh water storage tank 18 and the high temperature seawater storage tank 20, and the power of the vacuum pump 19 can be adjusted by the indication change of the mechanical pressure gauge 10. To reduce the distillation boiling point of seawater and improve distillation efficiency. The circulating water pump 21 provides power for the flow of seawater in the distillation subsystem to ensure that the seawater in the pipeline can flow normally.

To sum up, the distillation subsystem can heat the seawater in the tubular still 7, realize the negative pressure distillation of the seawater under the action of the vacuum pump 19, and improve the efficiency of seawater desalination.

② The solar heat collector 25, phase change heat storage tank 30, valves, pipelines (including seawater pipelines, fresh water pipelines and air pipelines) and circulating water pump 26 in the heating subsystem are shown in FIG. 1 .

When the sunlight is sufficient, the high-temperature heat exchange fluid (which may be but not limited to distilled water) in the heating subsystem is output from the solar heat collector 25 under the action of the circulating water pump 26 . Wherein, a part of the high-temperature heat exchange fluid directly enters the tubular still 7, and after the high-temperature heat exchange fluid passes through the U-shaped tube to exchange heat with seawater, it returns to the solar heat collector 25, and then is heated by the solar heat collector 25. Carry out a new cycle; another part of the high-temperature heat exchange fluid enters the phase change heat storage tank 30 to store heat in the phase change material. After the heat storage is completed, the high-temperature heat exchange fluid returns to the solar heat collector 25, and the 25 heating, a new cycle.

When the solar radiation is less, the heat energy provided by the solar collector 25 is only used to maintain the normal operation of the distillation subsystem, and the high-temperature heat exchange fluid flowing out from the solar collector 25 only enters the tubular still 7 and passes through the U-shaped The pipe exchanges heat with the seawater in the tubular distiller 7, returns to the solar heat collector 25 after the heat exchange is completed, and is then heated by the solar heat collector 25 to carry out a new cycle.

When the sunlight is insufficient, the high-temperature heat exchange fluid in the solar heat collector 25 enters the heat exchange coil in the phase change heat storage tank 30 through the circulating water pump 26, and enters the tubular distiller 7 after exchanging heat with the high temperature phase change material. , and exchange heat with the seawater in the tubular distiller 7 through the U-shaped tube, and return to the phase change heat storage tank 30 after the heat exchange is completed to perform a new cycle. That is to say, the circulating water pump 26 can input the heated distilled water to the tubular still 7 and/or the phase change heat storage tank 30 through the heat exchange pipeline.

To sum up, the heat supply subsystem can continuously heat the heat exchange fluid and exchange heat with seawater.

③ Photovoltaic panel 36 , power controller 35 , circuit switch 31 , circuit switch 32 and battery 34 in the power supply system are shown in FIG. 1 . When the sunlight is sufficient, the electric energy generated by the photovoltaic panel 36 in the power supply system is converted by the power controller 35 and stored in the battery 34 , and partly supplies energy for the circulating water pump 21 , the circulating water pump 26 and the vacuum pump 19 . When the sunlight is less, the electric energy generated by the photovoltaic panel 36 is converted by the power controller 35 to only supply energy for the circulating water pump 21, the circulating water pump 26 and the vacuum pump 19, and is not input into the battery 34 for storage. When the sunlight is insufficient, the energy required by the circulating water pump 21 , the circulating water pump 26 and the vacuum pump 19 is supplemented by the battery 34 . Wherein, the power controller 35 is used to control the output power of electric energy, and the circuit switch 31 is used to switch on/off the circuit. To sum up, the power supply system can use photovoltaic panels to convert solar energy into electrical energy, and continuously supply energy for vacuum pumps and circulating water pumps.

It can be seen from the above description that the solar distillation seawater desalination system provided by the present application can use the latent heat of water vapor condensation to preheat seawater, and use the phase change heat storage tank to supply heat to the tubular still in the distillation subsystem when the sun is insufficient. Heat, use the vacuum pump to draw negative pressure to reduce the evaporation temperature of seawater and increase the water production rate. By reasonably adjusting the valve opening and selecting the appropriate vacuum pump and circulating water pump, the entire system is in a dynamic balance. Wherein, the heat supply subsystem provides high-temperature thermal fluid for the distillation subsystem to heat distilled seawater. The power supply system supplies energy for the vacuum pump and the circulating water pump. The vacuum pump can ensure the negative pressure in the distillation subsystem, reduce the evaporation temperature of seawater, and then increase the fresh water production rate. The circulating water pump can ensure that the high-temperature heat exchange fluid is in the distillation subsystem and heat supply Continuous cyclic flow between subsystems. The three subsystems are independently connected and functionally coordinated. They can rationally integrate solar energy technology, seawater distillation technology and phase change heat storage technology, and realize 24-hour stable and uninterrupted high-efficiency desalination of seawater under the negative pressure distillation method.

In practice, it can be divided into three situations: sufficient sunlight (for example, in sunny conditions), weak solar radiation (for example, in cloudy conditions) and insufficient solar radiation (for example, in cloudy conditions).

①Sufficient solar radiation: when the solar energy supply is sufficient, open valve 22, valve 24, valve 27 and valve 28, and close valve 23 and valve 29. Open the circuit switch 32 and the circuit switch 33, and close the circuit switch 31. The high-temperature heat exchange fluid in the solar heat collector 25 flows out under the action of the circulating water pump 26, and part of it continues to enter the tube still 7 to distill seawater through the valve 27, and then returns to the solar heat collector 25 through the valve 22. The other part passes through the valve 28 to store heat for the phase change heat storage tank. After the heat is stored, it returns to the solar heat collector 25 through the valve 24, and then the heat is heated by the solar heat collector 25, and the heating subsystem enters a new cycle. . After the electric energy from the photovoltaic panel 36 in the power supply system passes through the power controller 35 , part of it supplies power to the vacuum pump 19 , the circulating water pump 21 and the circulating water pump 26 , and the other part charges the battery 34 .

② Weak solar radiation: When the solar energy supply is low and the normal operation of the entire solar distillation desalination system can only be maintained, open valve 22 and valve 27, and close valve 23, valve 24, valve 28 and valve 29. Open the circuit switch 32, close the circuit switch 31 and the circuit switch 33. The high-temperature heat exchange fluid is output from the solar heat collector 25 through the circulating water pump 26, and only through the valve 27, all of which enter the tubular still 7 to distill seawater, and then return to the solar heat collector 25 through the valve 22, and the heating subsystem A new cycle. The electric energy generated by the photovoltaic panel 36 in the power supply system is only used for the power supply of the vacuum pump 19 , the circulating water pump 21 and the circulating water pump 26 after passing through the power controller 35 .

③Insufficient solar irradiation: when the solar energy supply is insufficient, open the valve 23, the valve 28 and the valve 29, and close the valve 22, the valve 24 and the valve 27. The high-temperature heat exchange fluid required by the seawater distillation subsystem is provided by the phase change heat storage tank 30. The high temperature heat exchange fluid flows out of the phase change heat storage tank 30 through the valve 29 and enters the tubular still 7 to distill seawater for heat exchange. After completion, it enters into the phase change heat storage tank 30 through the valve 23, the circulating water pump 26 and the valve 28 for heating, and then enters a new cycle. Wherein, the power required by the vacuum pump 19 , the circulating water pump 21 and the circulating water pump 26 is all provided by the battery 34 .

Compared with the prior art, the beneficial effects of the solar distillation seawater desalination system provided by this application at least include:

1. High utilization efficiency of heat energy: Most of the heat energy of solar collectors is used for seawater distillation, and the heat energy and heat dissipation loss taken away by fresh water account for very little.

2. The structure of the distillation subsystem is simple: a single-stage tubular still is used, and the latent heat of condensation of water vapor is used to preheat seawater. Compared with three-stage or even multi-stage stills, it is more economical and less difficult to install and maintain .

3. Reasonable integration of solar energy technology, seawater distillation technology and phase change heat storage technology can achieve 24-hour stable and uninterrupted desalination of seawater.

4. The water production rate of fresh water is improved, and the internal pressure of the tube still is reduced by the vacuum pump, thereby reducing the evaporation temperature of seawater and making seawater evaporate more easily.

5. It can operate independently in an isolated island environment. After the initial completion, no additional energy input is required, and only simple maintenance is required in the later stage. It has certain universality and scalability.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiment of the method implemented by the device, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to the part of the description of the method embodiment.

The foregoing describes specific embodiments of this specification. Other implementations are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Multitasking and parallel processing are also possible or may be advantageous in certain embodiments.

Although the embodiments of this specification provide the operation steps of the method described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive means. The sequence of steps enumerated in the embodiments is only one of the execution sequences of many steps, and does not represent the only execution sequence. The term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, product, or apparatus comprising a set of elements includes not only those elements, but also other elements not expressly listed elements, or also elements inherent in such a process, method, product, or apparatus. Without further limitations, it is not excluded that there are additional identical or equivalent elements in a process, method, product or device comprising said elements.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, refer to part of the description of the method embodiment. In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the embodiments of this specification. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

The foregoing descriptions are merely examples of the embodiments of the present specification, and are not intended to limit the embodiments of the present specification. For those skilled in the art, various modifications and changes may be made to the embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of this specification shall be included within the scope of claims of the embodiments of this specification.

Claims (8)

1. A solar distillation seawater desalination system, comprising: a distillation subsystem and a heat supply subsystem;

the distillation sub-system comprises: a low-temperature seawater storage tank (4), an immersion cooling tank (8) and a tubular distiller (7) arranged in the immersion cooling tank (8); further comprising: a high temperature seawater storage tank (20) for storing high temperature seawater; a first circulating water pump (21) which extracts high-temperature seawater from the high-temperature seawater storage tank (20) and inputs the same to the tubular still (7) through a seawater pipeline;

the low-temperature seawater in the low-temperature seawater storage tank (4) enters the immersion cooling tank (8) through a seawater pipeline and is preheated by heat emitted when the tubular distiller (7) distills the seawater to obtain high-temperature seawater, and the high-temperature seawater enters the tubular distiller (7) and is distilled to obtain fresh water;

the heating subsystem includes: a solar heat collector (25) and a phase change heat storage tank (30); further comprising: a second circulating water pump (26) for inputting the heated heat exchange fluid to the tubular still (7) and/or the phase-change heat storage tank (30) through a heat exchange pipeline;

when the solar radiation is sufficient, the solar heat collector (25) heats the heat exchange fluid therein, and the heated heat exchange fluid is input to the tubular distiller (7) and the phase-change heat storage tank (30) through a heat exchange pipeline; when the sun is not sufficiently irradiated, the phase change heat storage tank (30) inputs the stored heat exchange fluid to the tubular distiller (7) through a heat exchange pipeline.

2. The solar distillation seawater desalination system of claim 1, wherein the distillation subsystem further comprises:

a fresh water storage tank (18) connected to the tubular still (7) by a fresh water line for receiving and storing fresh water.

3. The solar distillation seawater desalination system of claim 2, wherein the distillation subsystem further comprises:

a vacuum pump (19) for maintaining a negative pressure in the tubular still (7), the fresh water storage tank (18) and the high temperature seawater storage tank (20) to reduce a distillation boiling point of seawater and improve distillation efficiency.

4. The solar distillation seawater desalination system of claim 1, wherein the distillation subsystem further comprises:

and the filter (3) is arranged on a seawater pipeline between the seawater inlet and the low-temperature seawater storage tank (4) and is used for primarily filtering impurities in seawater.

5. Solar distillative desalination system according to claim 1, characterized in that the bottom of the tubular still (7) is provided with insulation to maintain the distillation efficiency of the seawater.

6. The solar distillation seawater desalination system of claim 1, further comprising: a power supply subsystem, the power supply subsystem comprising:

and the photovoltaic panel (36) is used for absorbing solar energy and converting the solar energy into electric energy so as to drive the first circulating water pump (21), the second circulating water pump (26) and the vacuum pump (19).

7. The solar distillation seawater desalination system of claim 6, wherein the power supply subsystem further comprises:

a power controller (35) and a battery (34);

the power controller (35) is used for inputting electric energy into the storage battery (34) with preset power, and the storage battery (34) drives the first circulating water pump (21), the second circulating water pump (26) and the vacuum pump (19).

8. The solar distillation seawater desalination system of claim 7, wherein the power supply subsystem further comprises:

a circuit switch for switching on or off a circuit between the power controller (35) and the storage battery (34).

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