A solar seawater desalination device and control method thereof

Abstract

The present invention discloses a solar desalination device and a control method thereof, comprising a solar heat collecting device, an evaporation chamber and a seawater extraction device; the improvement is that a first heat conducting plate is provided on the top of the evaporation chamber, a first channel is provided in the first heat conducting plate for connecting the first porous hydrophilic plate with the first water outlet pipe, and a second channel is provided for connecting each second porous hydrophilic plate with the second water outlet pipe; a first valve is provided on the second water outlet pipe, the first valve is electrically connected to a controller, the controller is electrically connected to a temperature sensor, and the temperature sensor is used to obtain the temperature in the evaporation chamber. Due to the adoption of the above technical solution, compared with the prior art, the present invention directly replenishes water to the second porous hydrophilic plate through the first channel, and the water replenishment flow rate increases as the temperature value increases, thereby realizing adaptive adjustment of the evaporation efficiency according to the lighting conditions, improving the energy conversion efficiency and water production. Secondly, it also effectively solves the problem of energy attenuation during the layer-by-layer transfer of heat energy leading to evaporation weakness.

Description

Technical Field

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

[0002] From 1970 to 2018, although the growth rate of global water withdrawal declined, the total amount still increased from 2.5 million cubic meters per year to 4.2 million cubic meters per year. Over the past 100 years, global freshwater use has increased sixfold. Desalination, one of the earliest known water treatment methods, is the most viable and sustainable solution to addressing freshwater scarcity. Desalination, which desalinates seawater to produce freshwater, is an open-source, incremental technology for water resource utilization. It can increase the total amount of freshwater, unaffected by time, space, and climate. Its high quality and increasingly reasonable price ensure a stable water supply for coastal residents, drinking water, and industrial boiler water replenishment.

[0003] Desalination technology has made significant progress over the past few decades. Existing desalination technologies include multi-effect distillation, multi-stage flash evaporation, and reverse osmosis. Chinese invention patent application publication number CN109231325A discloses a solar thermal focusing capillary-driven multi-stage desalination system. This system utilizes thermal focusing to recycle low-grade steam generated by solar energy and multi-stage recovery of the latent heat of condensation to achieve desalination.

[0004] However, the above technology has at least the following technical problems: it is impossible to adaptively adjust the evaporation efficiency according to the lighting conditions, and the energy conversion efficiency and water production are low. Summary of the Invention

[0005] The present invention provides a solar seawater desalination device and a control method thereof to solve the technical problems that the existing seawater desalination system cannot adaptively adjust the evaporation efficiency according to the lighting conditions, and has low energy conversion efficiency and water production.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0007] In one aspect, a solar desalination device is provided, comprising a solar heat collecting device, an evaporation chamber, and a seawater extraction device;

[0008] The solar thermal collector device includes a heat collector and a concentrator for focusing sunlight onto the heat collector; the heat collector is in close contact with the outer side of the first side wall of the evaporation chamber, and a first porous hydrophilic plate in close contact with the first side wall is vertically provided on the inner side of the first side wall; a plurality of second porous hydrophilic plates are vertically provided in the evaporation chamber in sequence from the first side wall to the second side wall opposite to the first side wall, and a hydrophobic layer is provided on the side of the second porous hydrophilic plate facing the first porous hydrophilic plate; a first water reservoir is provided at the bottom of the first porous hydrophilic plate, and a second water reservoir is provided on the side of the bottom of each second porous hydrophilic plate facing the first porous hydrophilic plate, and a third water reservoir is provided on the side facing away from the first porous hydrophilic plate;

[0009] The seawater extraction device includes an inlet pipe, a pump, a first outlet pipe, a second outlet pipe, and a third outlet pipe. One end of the inlet pipe is connected to the seawater, and the other end is connected to the pump. The other end of the pump is connected to the first outlet pipe and the second outlet pipe respectively. The third outlet pipe is connected to each third water reservoir respectively.

[0010] A first heat conducting plate is provided on the top of the evaporation chamber, and a first channel is provided in the first heat conducting plate for connecting the first porous hydrophilic plate with the first water outlet pipe, and a second channel is provided for connecting each second porous hydrophilic plate with the second water outlet pipe;

[0011] The second water outlet pipe is provided with a first valve, the first valve is electrically connected to a controller, the controller is electrically connected to a temperature sensor, and the temperature sensor is used to obtain the temperature in the evaporation chamber.

[0012] In some embodiments, a second heat conducting plate is connected to the side of the second porous hydrophilic plate facing the first porous hydrophilic plate, and the top of the second heat conducting plate is connected to the bottom of the first heat conducting plate; and the hydrophobic layer is provided on the side of the second heat conducting plate facing the first porous hydrophilic plate.

[0013] In some embodiments, a heating device is provided in the first channel.

[0014] In some embodiments, the filter device further comprises a filter, wherein the filter is provided with a cover plate on the top and a funnel-shaped water outlet at the center of the bottom, with a cavity formed between the cover plate and the bottom;

[0015] An overflow plate is provided along the edge of the top of the filter device. The cross-section of the overflow plate is arc-shaped, and the end of the overflow plate closer to the center of the filter device is lower than the end farther away from the center of the filter device. A gap is provided between the overflow plate and the top edge of the filter device. Liquid in the filter device flows out of the gap and flows into the first outlet pipe and the second outlet pipe respectively.

[0016] The cover plate is provided with an annular first baffle and a second baffle, both of which protrude from the lower surface of the cover plate, and the first baffle is located radially inward of the second baffle;

[0017] A funnel-shaped water inlet is provided directly above the water outlet, and a water inlet pipe is connected to the end of the water inlet with a smaller diameter. The water inlet pipe passes through the water outlet and is connected to the pump; a retaining bead is provided in the water inlet, and the retaining bead is connected to the inner wall of the water inlet through a flexible connector.

[0018] In some embodiments, a water reservoir is provided at the bottom of each second porous hydrophilic plate; the liquid in the cavity flows out from the gap and flows into the first water outlet pipe, the second water outlet pipe and the water reservoir respectively.

[0019] In some embodiments, a plurality of wing plates are vertically provided on the side of the second heat conducting plate facing the first porous hydrophilic plate, the angle between the wing plates and the second heat conducting plate is less than 90°, and the end of the wing plate away from the second heat conducting plate is lower than the end close to the second heat conducting plate.

[0020] In some embodiments, a plurality of wedge-shaped grooves are provided on the upper surface of the wing plate, and the plurality of wedge-shaped grooves are distributed in parallel along the width direction of the second heat conducting plate; the wedge-shaped grooves gradually decrease from the outer side of the wing plate to the inner side of the wing plate.

[0021] In some embodiments, the second porous hydrophilic plates are provided with four pieces; one piece is connected to the second side wall, and the other three pieces divide the space between the first side wall and the second side wall into four independent subspaces; from the first side wall to the second side wall, the distances between two adjacent second porous hydrophilic plates are 1:2:4 respectively.

[0022] In another aspect, a control method for the solar desalination device is provided, comprising the following steps:

[0023] When the temperature in the evaporation chamber is greater than a first preset temperature value, the first valve and the second valve are opened, and the opening of the first valve is controlled to increase as the temperature in the evaporation chamber increases and to decrease as the temperature in the evaporation chamber decreases;

[0024] When the temperature in the evaporation chamber is lower than a first preset temperature value, the first valve is closed and the second valve is opened;

[0025] The second valve is arranged on the first water outlet pipe.

[0026] In some embodiments, the control method further includes the following steps: when flushing, opening the first valve and the second valve and adjusting the opening of the first valve to the maximum, and closing the third valve.

[0027] The present invention has at least the following technical effects or advantages:

[0028] 1. Water is directly replenished to the second porous hydrophilic plate through the first channel. The water replenishment flow rate increases with the increase of temperature, thereby realizing the adaptive adjustment of evaporation efficiency according to light conditions, improving energy conversion efficiency and water production.

[0029] 2. The distance ratio of 1:2:4 between two adjacent second porous hydrophilic plates in the evaporation chamber increases the step size of the space, effectively solving the problem of energy attenuation during the layer-by-layer transfer of heat energy leading to evaporation weakness.

[0030] 3. Use the filter device to efficiently filter large particles of impurities to prevent the porous hydrophilic plate from being blocked.

[0031] 4. By flushing the porous hydrophilic plate, dissolving the salt, and completing the internal self-cleaning, the service life of the porous hydrophilic plate is extended and the replacement frequency of the porous hydrophilic plate is reduced.

[0032] 5. By setting the wing plate and the wedge-shaped groove on the wing plate, the droplets can rapidly nucleate, aggregate, grow and condense and migrate at the tail end of the wedge-shaped groove.

[0033] 6. By adding a baffle bead in the water inlet, the Reynolds number is quickly reduced, thereby better separating liquid and solid. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A three-dimensional perspective view of a solar seawater desalination device according to an embodiment of the present invention;

[0035] Figure 2 This is a three-dimensional schematic diagram of a solar seawater desalination device according to an embodiment of the present invention;

[0036] Figure 3 This is a front perspective view of a solar seawater desalination device according to one embodiment of the present invention;

[0037] Figure 4 Schematic diagram of the working state of a solar seawater desalination device generating fresh water in one embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the working state of a solar seawater desalination device during flushing according to one embodiment of the present invention;

[0039] Figure 6 Schematic diagram of an explosion of a filter device according to an embodiment of the present invention (partial cross-section);

[0040] Figure 7 This is a schematic diagram of the connection between the retaining bead and the water inlet in one embodiment of the present invention;

[0041] Figure 8 is a cross-sectional view of a filter device according to an embodiment of the present invention;

[0042] Figure 9 Schematic diagram of the structure of the wing plate and the wedge-shaped groove in one embodiment of the present invention;

[0043] Figure 10 Graph showing temperature distribution and velocity field distribution in the evaporation chamber according to one embodiment of the present invention;

[0044] Figure 11 2. The water vapor partial pressure gradient distribution diagram in the evaporation chamber according to one embodiment of the present invention;

[0045] Figure 12 This is a diagram showing the distribution of condensation supersaturation in the evaporation chamber in one embodiment of the present invention;

[0046] Figure 13 Schematic diagram comparing the displacement of the center of mass of a droplet on a wedge-shaped surface and a smooth surface in one embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0048] Example 1 See Figure 1-Figure 5 , a solar seawater desalination device, including a solar heat collecting device, an evaporation chamber and a seawater extraction device.

[0049] The solar thermal collector is located on one side of the evaporation chamber and includes a collector 5 and a concentrator 3 for focusing sunlight onto the collector 5. The collector 5 is in close contact with the outer side of the first side wall of the evaporation chamber. Preferably, to achieve a better heat collection effect, the solar thermal collector is enclosed by a curved base plate 1, side plates 2, a Low-E glass plate 4, and the collector 5 to form a closed cavity. The collector 5 is vertically mounted on the outer side of the first side wall of the evaporation chamber. The upper and lower ends of the collector 5 are respectively connected to the Low-E glass plate 4 and one end of the curved base plate 1. The other end of the curved base plate 1 is bent upward and connected to the other end of the Low-E glass plate 4. The concentrator 3 is mounted on the inner wall of the curved base plate 1. More preferably, thermal insulation is also mounted on the outer wall of the curved base plate 1.

[0050] The evaporation chamber is also a closed cavity. A first porous hydrophilic plate 61 is vertically provided on the inner side of the first side wall of the evaporation chamber, closely adjacent to the first side wall. A plurality of second porous hydrophilic plates 62 are vertically provided in the evaporation chamber, spaced sequentially from the first side wall to the second side wall opposite the first side wall. A second heat conducting plate 72 is provided on the side of the second porous hydrophilic plate 62 facing the first porous hydrophilic plate 61. A hydrophobic layer is provided on the second heat conducting plate 72. A first water reservoir 611 (concentrated brine pool) is provided at the bottom of the first porous hydrophilic plate 61. A second water reservoir 621 (fresh water pool) is provided on the bottom of each second porous hydrophilic plate 62 facing the first porous hydrophilic plate 61, and a third water reservoir 622 (seawater pool) is provided on the side facing away from the first porous hydrophilic plate 61.

[0051] Preferably, there are four second porous hydrophilic plates 62. One of them is connected to the second side wall, and the other three divide the space between the first side wall and the second side wall into four independent subspaces. From the first side wall to the second side wall, the distance between two adjacent second porous hydrophilic plates 62 is 1:2:4. Such a space ratio can match the evaporation amount and condensation amount in each subspace, thereby improving the evaporation efficiency. Figure 10-12 As shown, the results show that such a distance ratio increases the spatial steps, effectively solving the problem of energy attenuation leading to evaporation weakening during the layer-by-layer heat energy transfer.

[0052] A first heat-conducting plate 71 is installed at the top of the evaporation chamber. Preferably, to better utilize solar energy, highly transparent glass 81 and multiple spaced-apart photovoltaic panels 82 are positioned above the first heat-conducting plate 71, with a thermally conductive silicone layer 83 positioned between adjacent photovoltaic panels 82. Preferably, the top of a second heat-conducting plate 72 is connected to the bottom of the first heat-conducting plate 71, allowing heat absorbed by the first heat-conducting plate 71 to be transferred to the second porous hydrophilic plate 62 via the second heat-conducting plate 72, thereby accelerating the evaporation of the liquid within the second porous hydrophilic plate 62.

[0053] Preferably, if Figure 9As shown, in order to improve the condensation efficiency, a plurality of wing plates 73 are vertically provided on the side of the second heat conducting plate 72 facing the first porous hydrophilic plate 61. The angle between the wing plate 73 and the second heat conducting plate 72 is less than 90°, and the end of the wing plate 73 away from the second heat conducting plate 72 is lower than the end close to the second heat conducting plate 72. A plurality of wedge-shaped grooves 74 are provided on the upper surface of the wing plate 73. The plurality of wedge-shaped grooves 74 are distributed in parallel along the width direction of the second heat conducting plate 72, and the opening of the wedge-shaped grooves 74 gradually decreases from the outside of the wing plate 73 to the inside of the wing plate 73. A hydrophobic layer is provided on the wing plate 73 and the wedge-shaped grooves 74. Preferably, when the angle of the opening is in the range of 9°<α<15° and the angle β between the wing plate 73 and the second heat conducting plate 72 is ≈15°, the rapid nucleation, aggregation and growth of droplets at the tail end of the wedge-shaped groove 74 and the amount of condensation migration are significantly improved, as shown in FIG. Figure 13 shown.

[0054] The seawater extraction device includes an inlet pipe 91, a pump 92, a first outlet pipe 93, a second outlet pipe 94, and a third outlet pipe 95. One end of the inlet pipe 91 is connected to the seawater, and the other end is connected to the pump 92. The other ends of the pump 92 are respectively connected to the first outlet pipe 93 and the second outlet pipe 94. The third outlet pipe 95 is respectively connected to each third water reservoir 622. Preferably, a main water reservoir 10 is provided on the side of the bottom of the evaporation chamber, and each third water reservoir 622 is connected to the main water reservoir 10, and the main water reservoir 10 is connected to the third outlet pipe 95. A main freshwater tank 20 is provided on the side of the bottom of the evaporation chamber opposite the main water reservoir, and each second water reservoir 621 is connected to the main freshwater tank 20.

[0055] Preferably, a fourth water reservoir 623 is further included. The fourth water reservoir 623 contains seawater, and the water inlet pipe 91 extracts seawater from the fourth water reservoir 623. The fourth water reservoir 623 is also connected to the first water reservoir 611 via a pipe. A one-way valve is provided on the pipe to prevent the seawater in the fourth water reservoir 623 from flowing back into the first water reservoir 611.

[0056] The first heat conducting plate 71 is provided with a first channel 201 connecting the first porous hydrophilic plate 61 with the first water outlet pipe 93, and a second channel 202 connecting each second porous hydrophilic plate 62 with the second water outlet pipe 94. Essentially, both the first channel 201 and the second channel 202 are channels excavated within the first heat conducting plate 71, with the first channel 201 located above the second channel 202. The right end of the first channel 201 is connected to the first water outlet pipe 93, and the left end is connected to the first porous hydrophilic plate 61. The right end of the second channel 202 is connected to the second water outlet pipe 94, the left end is closed, and the lower end is connected to each second porous hydrophilic plate 62. Preferably, a heating device 203 is provided within the first channel 201 for heating the liquid flowing through the first channel 201.

[0057] A first valve 301 is provided on the second water outlet pipe 94. The first valve 301 is electrically connected to a controller, which is in turn electrically connected to a temperature sensor for detecting the temperature within the evaporation chamber. The solar photovoltaic panel 82 is electrically connected to a battery 84, which is in turn electrically connected to the pump 92 and the heating device 203. The battery 84 supplies electricity generated by the solar photovoltaic panel 82 to the pump 92 and the heating device 203. Preferably, the first valve 301 is a regulating valve. The first water outlet pipe 93 is provided with a second valve 302, and the third water outlet pipe 95 is provided with a third valve 303.

[0058] Preferably, in order to extend the service life of the porous hydrophilic plate and reduce the replacement frequency of the porous hydrophilic plate, as Figure 3 , Figure 6-Figure 8 As shown, a filter device 11 is also provided between the pump 92 and the outlet pipe. The filter device 11 is essentially a pool with a cover plate 12 at the top and a funnel-shaped outlet 13 at the center of the bottom. A cavity is formed between the cover plate 12 and the bottom of the filter device 11. A circle of overflow plates 14 are provided along the edge of the top of the filter device 11. The overflow plates 14 have an arc-shaped cross-section, with the end of the overflow plates 14 closer to the center of the filter device 11 lower than the end farther from the center. A gap exists between the overflow plates 14 and the top edge of the filter device 11. Liquid within the filter device 11 flows out of the gap and is collected in the collection tank 1101 before flowing into the first outlet pipe 93, the second outlet pipe 94, and the third outlet pipe 95, respectively. The cover plate 12 is provided with an annular first baffle 15 and a second baffle 16, both of which protrude from the lower surface of the cover plate 12. The first baffle 15 is located radially inward of the second baffle 16. A funnel-shaped water inlet 17 is located directly above the water outlet 13. A water inlet pipe 18 is connected to the smaller end of the water inlet 17. The water inlet pipe 18 passes through the water outlet 13 and is connected to the pump 92. The water outlet 13 is connected to the fourth water reservoir 623 via a pipe. A retaining bead 19 is located within the water inlet 17 and is connected to the inner wall of the water inlet 17 via a flexible connector.

[0059] like Figure 8As shown, after the seawater is pressurized by the pump 92, the mixed liquid with solid flocs enters the filter device 11 through the water inlet 17. In the filter device 11, gravity causes the flocs to settle at the bottom. The filter device 11 is provided with two outlets: the water outlet 13, which is used to discharge the flocs deposited at the bottom to the fourth water reservoir 623. The other outlet is located at the outer edge of the filter device 11, that is, the gap between the overflow plate 14 and the top edge of the filter device 11, which is used to discharge the purified seawater. The impure liquid enters the sedimentation tank in the form of a jet. The Reynolds number calculated based on the inlet velocity and the inlet diameter is 25000, indicating that the flow field is turbulent. The mixed liquid collides with the free liquid surface and diffuses, causing the turbulence generation rate to decrease with increasing radial distance. Since turbulence may enhance the mixing of liquid and solid, thereby having a negative impact on the separation process, a baffle bead 19 is added to the water inlet 17 to quickly reduce the Reynolds number, thereby enabling better separation of liquid and solid. After adding the blocking beads 19, the minimum value in the cavity (except for the area near the boundary layer) is reduced to 20. For lighter flocs, the first baffle 15 and the second baffle 16 are used to block them.

[0060] During operation, the pump 92 draws seawater from the fourth water reservoir 623 and enters the filter device 11 through the water inlet pipe 18 and the water inlet 17. The seawater filtered by the filter device 11 flows out from the gap and is collected by the collection pool 1101 and then flows into the first outlet pipe 93, the second outlet pipe 94 and the third outlet pipe 95 respectively.

[0061] During daytime operation, some of the water in the second porous hydrophilic plate 62 evaporates and enters the second channel 202. During the condensation of water vapor in the second channel 202, the heat released is absorbed by the fluid in the first channel 201 and used for preheating. In this operating state, the first valve 301 is closed, the second valve 302 is open, and the third valve 303 is open. To ensure continuous freshwater production during periods of low light during the day or at night, the system stores electrical energy in the battery 84 on sunny days and heats the fluid in the first channel 201 using the heating device 203, enabling continuous desalination even in low light conditions. In this operating state, the first valve 301 is closed, the second valve 302 is open, and the third valve 303 is open.

[0062] When the weather is clear and the sunlight is strong (the temperature inside the evaporation chamber is greater than the first preset temperature of 60°C), the evaporation efficiency reaches its peak, and the water absorption rate of the second porous hydrophilic plate 62 is lower than the evaporation rate. The first valve 301, the second valve 302, and the third valve 303 are opened, and the opening of the first valve 301 is controlled to increase as the temperature inside the evaporation chamber increases and decrease as the temperature inside the evaporation chamber decreases. The third valve 301 is controlled by the liquid level of the seawater reservoir 622. It opens when the liquid level drops to the evaporation level (20% of the storage height) and closes when it reaches the upper storage limit (80% of the storage height). In this way, seawater flows from top to bottom through the first outlet pipe 93 and the first channel 201 to replenish each second porous hydrophilic plate 62. The flow rate increases with the temperature, adaptively adjusting the evaporation efficiency according to the light conditions, improving energy conversion efficiency and water production. After long-term operation, the first porous hydrophilic plate 61 and the second porous hydrophilic plate 62 may be blocked due to capillary pressure or salt crystallization, affecting the capillary action and causing uneven temperature distribution. To ensure that the system has sufficient cooling effect, both need to be flushed. The first valve 301 and the second valve 302 are opened and the opening of the first valve 301 is adjusted to the maximum. The third valve 303 is closed and the heating device 203 is turned on to heat the fluid in the first channel 201. The heated seawater flushes the first porous hydrophilic plate 61 and the second porous hydrophilic plate 62 from top to bottom.

[0063] Example 2

[0064] A control method for the above-mentioned solar desalination device includes the following steps:

[0065] When the temperature in the evaporation chamber is greater than a first preset temperature value, the first valve and the second valve are opened, and the opening of the first valve is controlled to increase as the temperature in the evaporation chamber increases and to decrease as the temperature in the evaporation chamber decreases;

[0066] When the temperature in the evaporation chamber is lower than a first preset temperature value, the first valve is closed and the second valve is opened;

[0067] The second valve is arranged on the first water outlet pipe.

[0068] Preferably, the control method comprises the following steps: when flushing, opening the first valve and the second valve and adjusting the opening of the first valve to the maximum, and closing the third valve.

[0069] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0070] Similarly, it should be understood that in order to streamline the present disclosure and aid understanding of one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the invention.

[0071] Those skilled in the art will appreciate that the modules, units, or groups of devices in the examples disclosed herein may be arranged in the device described in the embodiment, or alternatively may be located in one or more devices different from the devices in the examples. The modules in the aforementioned examples may be combined into one module or further divided into multiple submodules.

[0072] It will be appreciated by those skilled in the art that the modules in the devices of the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or groups in the embodiments may be combined into one module or unit or group, and furthermore they may be divided into a plurality of submodules or subunits or subgroups. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed herein may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0073] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features and not other features included in other embodiments, the combination of features from different embodiments is intended to be within the scope of the invention and to form different embodiments.

[0074] In addition, some of the embodiments are described herein as methods or combinations of method elements that can be implemented by a processor of a computer system or by other devices that perform the functions described. Thus, a processor having the necessary instructions for implementing the method or method element forms a device for implementing the method or method element. Furthermore, the elements described herein of the device embodiments are examples of devices for implementing the functions performed by the elements for the purpose of implementing the invention.

[0075] The various techniques described herein may be implemented in conjunction with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions of the methods and apparatus of the present invention, may take the form of program code (i.e., instructions) embedded in a tangible medium, such as a floppy disk, CD-ROM, hard drive, or any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes an apparatus for practicing the present invention.

[0076] When the program code is executed on a programmable computer, the computing device generally includes a processor, a storage medium readable by the processor (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store the program code; the processor is configured to execute the method of the present invention according to the instructions in the program code stored in the memory.

[0077] By way of example and not limitation, computer-readable media include computer storage media and communication media. Computer-readable media include computer storage media and communication media. Computer storage media stores information such as computer-readable instructions, data structures, program modules, or other data. Communication media generally embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and includes any information delivery media. Combinations of any of the above are also included within the scope of computer-readable media.

[0078] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved and are not intended to imply that the objects so described must have a given order in time, space, ranking, or in any other manner.

[0079] Although the present invention has been described with respect to a limited number of embodiments, it will be apparent to those skilled in the art, having benefit of the foregoing description, that other embodiments are contemplated within the scope of the invention thus described. Furthermore, it should be noted that the language used in this specification has been selected primarily for readability and didactic purposes, rather than for the purpose of explaining or limiting the subject matter of the present invention. Consequently, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative rather than restrictive of the scope of the invention, which is defined by the appended claims.

[0080] Finally, it should be noted that the present invention does not explain in detail the common knowledge recognized by technicians in this field. The above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A solar desalination device comprising a solar heat collecting device, an evaporation chamber and a seawater extraction device; The solar thermal collector device includes a heat collector and a concentrator for focusing sunlight onto the heat collector; the heat collector is in close contact with the outer side of the first side wall of the evaporation chamber, and a first porous hydrophilic plate in close contact with the first side wall is vertically provided on the inner side of the first side wall; a plurality of second porous hydrophilic plates are vertically provided in the evaporation chamber in sequence from the first side wall to the second side wall opposite to the first side wall, and a hydrophobic layer is provided on the side of the second porous hydrophilic plate facing the first porous hydrophilic plate; a first water reservoir is provided at the bottom of the first porous hydrophilic plate, and a second water reservoir is provided on the side of the bottom of each second porous hydrophilic plate facing the first porous hydrophilic plate, and a third water reservoir is provided on the side facing away from the first porous hydrophilic plate; The seawater extraction device includes an inlet pipe, a pump, a first outlet pipe, a second outlet pipe, and a third outlet pipe. One end of the inlet pipe is connected to the seawater, and the other end is connected to the pump. The other end of the pump is connected to the first outlet pipe and the second outlet pipe respectively. The third outlet pipe is connected to each third water reservoir respectively. Its characteristics are: A first heat conducting plate is provided on the top of the evaporation chamber, and a first channel is provided in the first heat conducting plate for connecting the first porous hydrophilic plate with the first water outlet pipe, and a second channel is provided for connecting each second porous hydrophilic plate with the second water outlet pipe; The second water outlet pipe is provided with a first valve, the first valve is electrically connected to a controller, the controller is electrically connected to a temperature sensor, and the temperature sensor is used to obtain the temperature within the evaporation chamber; A second heat conducting plate is connected to the side of the second porous hydrophilic plate facing the first porous hydrophilic plate, and the top of the second heat conducting plate is connected to the bottom of the first heat conducting plate; the hydrophobic layer is provided on the side of the second heat conducting plate facing the first porous hydrophilic plate; When the equipment is working during the day, the first valve is closed, and part of the water in the second porous hydrophilic plate evaporates and enters the second channel; during the condensation process, the released heat is absorbed by the fluid in the first channel; when the temperature in the evaporation chamber is higher than the first preset temperature value, the first valve is opened, and seawater flows from top to bottom through the first outlet pipe and the first channel into each second porous hydrophilic plate for water replenishment.

2. The solar seawater desalination device according to claim 1, characterized in that: A heating device is provided in the first channel.

3. The solar seawater desalination device according to claim 1, characterized in that: It also includes a filtering device, wherein the top of the filtering device is provided with a cover plate, the center of the bottom is provided with a funnel-shaped water outlet, and a cavity is formed between the cover plate and the bottom; An overflow plate is provided along the edge of the top of the filter device. The cross-section of the overflow plate is arc-shaped, and the end of the overflow plate closer to the center of the filter device is lower than the end farther away from the center of the filter device. A gap is provided between the overflow plate and the top edge of the filter device. Liquid in the filter device flows out of the gap and flows into the first outlet pipe and the second outlet pipe respectively. The cover plate is provided with an annular first baffle and a second baffle, both of which protrude from the lower surface of the cover plate, and the first baffle is located radially inward of the second baffle; A funnel-shaped water inlet is provided directly above the water outlet, and a water inlet pipe is connected to the end of the water inlet with a smaller diameter. The water inlet pipe passes through the water outlet and is connected to the pump; a retaining bead is provided in the water inlet, and the retaining bead is connected to the inner wall of the water inlet through a flexible connector.

4. The solar seawater desalination device according to claim 3, characterized in that: A water reservoir is provided at the bottom of each of the second porous hydrophilic plates; the liquid in the cavity flows out from the gap and flows into the first water outlet pipe, the second water outlet pipe and the water reservoir respectively.

5. The solar seawater desalination device according to claim 1, characterized in that: A plurality of wing plates are vertically provided on the side of the second heat conducting plate facing the first porous hydrophilic plate. The angle between the wing plates and the second heat conducting plate is less than 90°, and the end of the wing plate away from the second heat conducting plate is lower than the end close to the second heat conducting plate.

6. The solar seawater desalination device according to claim 5, characterized in that: A plurality of wedge-shaped grooves are provided on the upper surface of the wing plate, and the plurality of wedge-shaped grooves are distributed in parallel along the width direction of the second heat conducting plate; the wedge-shaped grooves gradually decrease in size from the outer side of the wing plate to the inner side of the wing plate.

7. The solar seawater desalination device according to claim 1, characterized in that: There are four second porous hydrophilic plates; one of them is connected to the second side wall, and the other three divide the space between the first side wall and the second side wall into four independent subspaces; from the first side wall to the second side wall, the distance between two adjacent second porous hydrophilic plates is 1:2:4 respectively.

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