Water and electricity production floating type seawater desalination system and method

Abstract

The invention relates to the technical field of seawater desalination, in particular to a water and electricity dual-production floating type seawater desalination system and method. The floating type sea water desalination system capable of generating water and electricity comprises a photovoltaic heat collection device, a water supply device, a water supply device and a water supply device, and the seawater desalination device floats on the sea surface, is connected with the photovoltaic heat collection device, and is used for heating and evaporating seawater entering the seawater desalination device by utilizing heat energy generated by the photovoltaic heat collection device so as to generate fresh water and store the generated fresh water into the seawater desalination device. According to the technical scheme provided by the invention, the photovoltaic heat collection device and the seawater desalination device which float on the sea surface are arranged, so that seawater desalination can be directly carried out in a sea area by utilizing heat energy generated by photovoltaic power, electric energy generated by photovoltaic power can be collected, the effect of producing water and electricity is realized, and the cost of seawater desalination is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of seawater desalination, and in particular to a floating seawater desalination system and method for producing both water and electricity. Background Art

[0002] Desalination refers to the conversion of seawater with a high salt content into fresh water suitable for drinking or industrial use. This technology solves the problem of fresh water shortage near the ocean.

[0003] In the related technology, seawater desalination consumes a lot of energy and cannot be carried out in the sea (that is, it is usually located in land areas near thermal power plants and steel mills), which increases the cost of seawater desalination.

[0004] Therefore, how to reduce the cost of seawater desalination is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to reduce the cost of seawater desalination, an embodiment of the present invention provides a floating seawater desalination system and method for generating both water and electricity.

[0006] In a first aspect, an embodiment of the present invention provides a floating seawater desalination system for generating both water and electricity, comprising:

[0007] Photovoltaic thermal collectors float on the sea surface to generate electricity and heat;

[0008] The seawater desalination device floats on the sea surface and is connected to the photovoltaic thermal collection device. It is used to utilize the heat energy generated by the photovoltaic thermal collection device to heat and evaporate the seawater entering the seawater desalination device to generate fresh water and store the generated fresh water in the seawater desalination device.

[0009] In a second aspect, an embodiment of the present invention provides a floating seawater desalination method for generating both water and electricity, which is applied to the system described in the above embodiment, and includes:

[0010] Using the photovoltaic thermal collection device to generate electrical energy and thermal energy;

[0011] The heat energy generated by the photovoltaic heat collection device is used to heat and evaporate the seawater entering the seawater desalination device to generate fresh water, and the generated fresh water is stored in the seawater desalination device.

[0012] The embodiment of the present invention provides a floating seawater desalination system and method for dual production of water and electricity. By setting up a photovoltaic thermal collector and a seawater desalination device floating on the sea surface, the thermal energy generated by photovoltaics can be directly used to desalinate seawater in the sea area, and the electrical energy generated by photovoltaics can also be collected to achieve the dual production of water and electricity, thereby reducing the cost of seawater desalination. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are 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.

[0014] Figure 1 It is a structural schematic diagram of a floating seawater desalination system for generating both water and electricity provided by an embodiment of the present invention.

[0015] Reference numerals:

[0016] 1- Photovoltaic thermal collector;

[0017] 11- Photovoltaic panels;

[0018] 12-circulating water pipeline;

[0019] 121-rising pipe;

[0020] 122-down pipe;

[0021] 123-water inlet pipe;

[0022] 124-water outlet pipe;

[0023] 2-Seawater desalination plant;

[0024] 21-Ship-shaped container;

[0025] 22-porous media;

[0026] 23-Seawater pipe;

[0027] 24-Sprinkler;

[0028] 25-liquid storage chamber;

[0029] 26- Drain pipe;

[0030] 27-liquid retaining plate;

[0031] 28- condenser;

[0032] 291-First Space;

[0033] 292-The second space. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Figure 1 This is a flow chart of a floating seawater desalination system for both water and electricity production provided by one embodiment of the present invention. Figure 1 As shown, the floating desalination system for hydropower generation includes:

[0036] A photovoltaic thermal collector 1, floating on the sea surface, is used to generate electrical energy and thermal energy;

[0037] The desalination device 2 floats on the sea surface and is connected to the photovoltaic thermal collector 1. It is used to use the heat energy generated by the photovoltaic thermal collector 1 to heat and evaporate the seawater entering the desalination device 2 to generate fresh water and store the generated fresh water in the desalination device 2.

[0038] In this embodiment, by setting up a photovoltaic thermal collector 1 and a seawater desalination device 2 floating on the sea surface, the thermal energy generated by photovoltaics can be directly used to desalinate seawater in the sea area, and the electrical energy generated by photovoltaics can also be collected to achieve the dual production of water and electricity, thereby reducing the cost of seawater desalination.

[0039] In one embodiment of the present invention, the photovoltaic thermal collector device 1 includes a photovoltaic panel 11 and a circulating water pipe 12, both of which are arranged obliquely. The lower end of the circulating water pipe 12 is in contact with the back of the photovoltaic panel 11 to absorb the heat energy generated by the photovoltaic panel 11, and the upper end is arranged inside the photovoltaic thermal collector device 1.

[0040] In this embodiment, the photovoltaic thermal collection device 1 includes a photovoltaic panel 11 and a circulating water pipe 12, both of which are arranged obliquely. The lower end of the circulating water pipe 12 is in contact with the back of the photovoltaic panel 11. In this way, the density and natural seawater convection can be utilized to save the power consumption of circulating hot water and cooling water, and the seawater can be desalinated with low power consumption while cooling the photovoltaic panel and increasing its efficiency.

[0041] In one embodiment of the present invention, the circulating water pipeline 12 includes an ascending pipe 121 and a downpipe 122 which are arranged obliquely, and an inlet pipe 123 and an outlet pipe 124 which are arranged horizontally. The ascending pipe 121 is in contact with the back of the photovoltaic panel 11. The ascending pipe 121, the inlet pipe 123, the outlet pipe 124 and the downpipe 122 are connected end to end in sequence to form a loop. The inlet pipe 123 and the outlet pipe 124 are arranged inside the photovoltaic collector 1. The hot water after absorbing heat energy enters the inlet pipe 123 from the ascending pipe 121. The inlet pipe 123 releases heat to heat and evaporate the seawater entering the desalination device 2. The cold water after releasing heat enters the downpipe 122 from the outlet pipe 124.

[0042] In this embodiment, by making the riser 121 fit against the back of the photovoltaic panel 11, the photovoltaic panel 11 can be cooled by the cold water from the downcomer 122, so as to improve the power generation efficiency and service life of the photovoltaic panel 11. At the same time, the hot water after absorbing heat rises to the water inlet pipe 123 by utilizing the density difference, so that high-energy-consuming pumps such as hot water pumps and cooling water pumps can be eliminated, thereby reducing power consumption. Then, heat is released in the water inlet pipe 123 to heat and evaporate the seawater entering the seawater desalination device 2, thereby heating the seawater to obtain fresh water; the circulating water after heat release enters the downcomer 122 from the water outlet pipe 124 due to the density difference, and this process is repeated.

[0043] In one embodiment of the present invention, the seawater desalination device 2 includes a ship-shaped container 21 and a porous medium 22 arranged inside the ship-shaped container 21. The ship-shaped container 21 floats on the sea surface, and the water inlet pipe 123 is penetrated through the porous medium 22. The seawater entering the seawater desalination device 2 is sprayed onto the porous medium 22. The porous medium 22 has a plurality of micron channels that penetrate the inner and outer surfaces.

[0044] In one embodiment of the present invention, the seawater desalination device 2 also includes a seawater pipe 23 and a sprinkler 24. One end of the seawater pipe 23 is inserted under the sea surface, and the other end is connected to the sprinkler 24. The sprinkler 24 is arranged inside the ship-shaped container 21 and located above the porous medium 22.

[0045] In one embodiment of the present invention, the seawater desalination device 2 further includes a liquid storage chamber 25 connected to the seawater pipe 23. The liquid storage chamber 25 is disposed outside the ship-shaped container 21 and is used to store seawater.

[0046] In one embodiment of the present invention, the seawater desalination device 2 further includes a drain pipe 26, one end of the drain pipe 26 is located inside the boat-shaped container 21, and the other end extends out of the boat-shaped container 21. The drain pipe 26 is used to discharge evaporated seawater.

[0047] In one embodiment of the present invention, the seawater desalination device 2 also includes a liquid baffle plate 27 arranged inside the boat-shaped container 21, the top of the liquid baffle plate 27 is fixed to the top of the boat-shaped container 21, and the bottom is fixed to the drain pipe 26. The sprayer 24 is arranged at the top of the first space 291 formed by the liquid baffle plate 27, the boat-shaped container 21 and the drain pipe 26. The liquid baffle plate 27 is used to prevent the seawater sprayed by the sprayer 24 from leaving the first space 291.

[0048] In one embodiment of the present invention, the seawater desalination device 2 also includes a condenser 28 arranged at the bottom of the ship-shaped container 21. The condenser 28 is located below the sea surface, and seawater can flow through the condenser 28. The liquid baffle 27, the ship-shaped container 21 and the drain pipe 26 also form a second space 292. The second space 292 and the first space 291 constitute the internal space of the ship-shaped container 21. The condenser 28 is used to use seawater to cool the steam discharged from the liquid baffle 27 to generate fresh water and store the generated fresh water at the bottom of the second space 292.

[0049] In this embodiment, since the desalination device 2 is in a negative pressure state inside, after the seawater evaporates and condenses, the seawater pipe 23 will automatically suck seawater from the sea for water replenishment. A liquid storage chamber 25 is added in the middle to prevent the water inlet from leaving the sea surface when the boat-shaped container 21 floats, resulting in the inability to take water in time. The seawater is sprayed onto the porous medium 22 through the sprayer 24, and the inner side of the porous medium 22 is replenished with water under the action of capillary force. After the circulating hot water enters the desalination device 2, the seawater inside the porous medium 22 is heated to evaporate, and the steam flows out from the micron pores. The remaining salt water (i.e., the evaporated seawater) flows into the drain pipe 26 and flows out under the action of gravity and a low-power pump. The steam discharged from the micron pores flows over the liquid baffle 27 under the action of the pressure difference to the surface of the condenser 28 immersed in the seawater. Under the cooling effect of the seawater, the steam condenses into fresh water.

[0050] The following introduces the specific working principle of the floating seawater desalination system for hydropower and electricity production.

[0051] During the day when the photovoltaic panel 11 is working, the circulating water on the back of the photovoltaic panel 11 is heated and heated. Since the circulating water on the back of the photovoltaic panel 11 located at the riser 121 has a high temperature and low density, and the circulating water entering the downcomer 122 after cooling down in the seawater desalination device 2 has a low temperature and a high density, the water in the entire circulation pipeline realizes natural flow. The circulating water continuously takes away the heat of the photovoltaic panel 11, cools the photovoltaic panel 11, and increases the power generation efficiency of the photovoltaic cell. After the circulating hot water enters the seawater desalination device 2, the seawater in the porous medium 22 is heated and evaporated, and the steam enters the second space 292. The remaining salt water flows into the drain pipe 26 and flows out under the action of gravity and a low-power pump. Since the first space 291 is in a negative pressure state, after the seawater is consumed by evaporation, the seawater pipe 23 will automatically suck seawater from the sea into the liquid storage chamber 25. The steam in the first space 291 flows to the condenser 28 immersed in the seawater through the liquid baffle 27 under the action of the pressure difference, and the steam condenses into fresh water under the cooling action of the seawater. In the whole system, only the drainage pump consumes a small amount of electricity, which can be fully covered by the increased power generation efficiency of the photovoltaic panels, thus achieving the dual production of water and electricity.

[0052] In summary, the above technical solution has the following advantages:

[0053] 1) By connecting the circulating water pipelines 12 in series and arranging them in an overall tilted manner in the heat collecting device 1, the circulating water can circulate naturally by utilizing the density difference, thereby saving the power consumption of circulating hot water;

[0054] 2) By immersing the condenser tube 28 in seawater, the natural flow of seawater is used for cooling, thereby eliminating the power consumption of cooling water;

[0055] 3) The outflow of salt water utilizes gravity to compensate for part of the power consumption, thus reducing the power consumption of salt water outflow;

[0056] 4) Seawater desalination utilizes the waste heat from photovoltaics. In addition to producing fresh water, it also cools the photovoltaic panels, increasing the power generation, which can cover the power consumption of the brine pump. The overall system not only does not consume electricity, but generates more electricity.

[0057] In addition, an embodiment of the present invention further provides a floating seawater desalination method for generating both water and electricity, which is applied to the system mentioned in any of the above embodiments, including:

[0058] Using the photovoltaic thermal collector 1 to generate electrical energy and thermal energy;

[0059] The heat energy generated by the photovoltaic thermal collection device 1 is used to heat and evaporate the seawater entering the seawater desalination device 2 to generate fresh water, and the generated fresh water is stored in the seawater desalination device 2 .

[0060] It can be understood that the method embodiment and system embodiment provided by the present invention are based on the same inventive concept and have the same beneficial effects, and the beneficial effects of the method embodiment will not be elaborated herein.

[0061] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical factors in the process, method, article or device including the elements.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A floating seawater desalination system with both hydropower and electricity production, characterized in that: include: A photovoltaic thermal collector (1) floating on the sea surface for generating electrical energy and thermal energy; The seawater desalination device (2) floats on the sea surface and is connected to the photovoltaic thermal collection device (1), and is used to utilize the heat energy generated by the photovoltaic thermal collection device (1) to heat and evaporate the seawater entering the seawater desalination device (2), so as to generate fresh water, and store the generated fresh water in the seawater desalination device (2).

2. The system according to claim 1, characterized in that The photovoltaic heat collection device (1) comprises a photovoltaic panel (11) and a circulating water pipeline (12) both of which are arranged at an angle; the lower end of the circulating water pipeline (12) is in contact with the back of the photovoltaic panel (11) for absorbing heat energy generated by the photovoltaic panel (11); and the upper end is arranged inside the photovoltaic heat collection device (1).

3. The system according to claim 2, characterized in that The circulating water pipeline (12) comprises an ascending pipe (121) and a descending pipe (122) which are arranged obliquely, and a water inlet pipe (123) and a water outlet pipe (124) which are arranged horizontally. The ascending pipe (121) is in contact with the back of the photovoltaic panel (11). The ascending pipe (121), the water inlet pipe (123), the water outlet pipe (124) and the descending pipe (122) are connected end to end in sequence to form a loop. The water inlet pipe (123) and the water outlet pipe (124) are arranged inside the photovoltaic heat collecting device (1). Hot water after absorbing heat energy enters the water inlet pipe (123) from the ascending pipe (121). The water inlet pipe (123) releases heat to heat and evaporate the seawater entering the seawater desalination device (2). The cold water after releasing heat enters the descending pipe (122) from the water outlet pipe (124).

4. The system according to claim 3, characterized in that The seawater desalination device (2) comprises a ship-shaped container (21) and a porous medium (22) arranged inside the ship-shaped container (21); the ship-shaped container (21) floats on the sea surface; the water inlet pipe (123) is penetrated through the porous medium (22); the seawater entering the seawater desalination device (2) is sprayed onto the porous medium (22); and the porous medium (22) has a plurality of micrometer channels penetrating the inner and outer surfaces.

5. The system according to claim 4, characterized in that The seawater desalination device (2) further comprises a seawater pipe (23) and a sprayer (24); one end of the seawater pipe (23) is inserted below the sea surface, and the other end is connected to the sprayer (24); the sprayer (24) is arranged inside the ship-shaped container (21) and above the porous medium (22).

6. The system according to claim 5, characterized in that The seawater desalination device (2) further comprises a liquid storage chamber (25) connected to the seawater pipe (23); the liquid storage chamber (25) is arranged outside the ship-shaped container (21); and the liquid storage chamber (25) is used to store seawater.

7. The system according to claim 5, characterized in that The seawater desalination device (2) further comprises a drain pipe (26), one end of the drain pipe (26) being located inside the boat-shaped container (21) and the other end extending out of the boat-shaped container (21), and the drain pipe (26) being used to discharge evaporated seawater.

8. The system according to claim 7, characterized in that The seawater desalination device (2) further comprises a liquid baffle (27) arranged inside the boat-shaped container (21), the top end of the liquid baffle (27) being fixed to the top end of the boat-shaped container (21), and the bottom end being fixed to the drain pipe (26); the sprayer (24) being arranged at the top of a first space (291) formed by the liquid baffle (27), the boat-shaped container (21) and the drain pipe (26); the liquid baffle (27) being used to prevent the seawater sprayed by the sprayer (24) from leaving the first space (291).

9. The system according to claim 8, characterized in that The seawater desalination device (2) further comprises a condenser (28) arranged at the bottom of the boat-shaped container (21); the condenser (28) is located below the sea surface, and seawater can flow through the condenser (28); the liquid baffle plate (27), the boat-shaped container (21) and the drain pipe (26) further form a second space (292); the second space (292) and the first space (291) constitute the internal space of the boat-shaped container (21); the condenser (28) is used to use seawater to cool the steam discharged from the liquid baffle plate (27) to generate fresh water, and the generated fresh water is stored in the bottom of the second space (292).

10. A floating seawater desalination method for both hydropower and electricity production, characterized in that: A system as claimed in any one of claims 1 to 9, comprising: Using the photovoltaic thermal collection device (1) to generate electrical energy and thermal energy; The heat energy generated by the photovoltaic heat collection device (1) is used to heat and evaporate the seawater entering the seawater desalination device (2) to generate fresh water, and the generated fresh water is stored in the seawater desalination device (2).

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