Solar seawater desalination device and control method thereof

Abstract

The invention discloses a solar seawater desalination device and a control method thereof. The solar seawater desalination device comprises a solar heat collection device, an evaporation chamber and a seawater extraction device, the improvement point is that a first heat conducting plate is arranged at the top of the evaporation chamber, and a first channel for communicating the first porous hydrophilic plate with the first water outlet pipe and a second channel for communicating each second porous hydrophilic plate with the second water outlet pipe are arranged in the first heat conducting plate; a first valve is arranged on the second water outlet pipe and electrically connected with a controller, the controller is electrically connected with a temperature sensor, and the temperature sensor is used for obtaining the temperature in the evaporation chamber. Due to the adoption of the technical scheme, compared with the prior art, water is directly supplemented to the second porous hydrophilic plate through the first channel, and the water supplementing flow is increased along with the increase of the temperature value, so that the evaporation efficiency is adaptively adjusted according to the illumination condition, and the energy conversion efficiency and the water yield are improved. And secondly, the problem of evaporation weakness caused by energy attenuation in the layer-by-layer heat transfer process is effectively solved.

Description

Technical Field

[0001] The 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 has declined, its total amount has still increased from 2.5 million cubic meters per year to 4.2 million cubic meters per year. In the past 100 years, global freshwater consumption has increased sixfold. As one of the earliest water treatment methods known to mankind, seawater desalination is the most feasible and sustainable solution to the shortage of freshwater resources. Seawater desalination is the use of seawater desalination to produce fresh water. It is an open source incremental technology for realizing water resource utilization. It can increase the total amount of fresh water and is not affected by time, space and climate. The water quality is good and the price is becoming more reasonable. It can ensure a stable water supply for drinking water for coastal residents and water replenishment for industrial boilers.

[0003] In the past few decades, seawater desalination technology has made great progress. Existing seawater desalination technologies include multi-effect distillation, multi-stage flash evaporation, reverse osmosis, etc. The Chinese invention patent application with publication number CN109231325A discloses a solar thermal focusing capillary driven multi-stage seawater desalination system, which realizes seawater desalination by realizing the recycling of low-grade steam generated by solar energy and multi-stage recovery of steam condensation latent heat through thermal focusing method.

[0004] However, the above technology has at least the following technical problems: the evaporation efficiency cannot be adaptively adjusted 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 illumination conditions, and the energy conversion efficiency and water production are low.

[0006] To achieve the above object, the present invention adopts the following technical solution.

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

[0008] The solar thermal collector comprises a heat collector and a condenser for focusing sunlight on 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 of the second porous hydrophilic plates 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 comprises a water inlet pipe, a pump, a first water outlet pipe, a second water outlet pipe and a third water outlet pipe, one end of the water inlet pipe is connected to the seawater, and the other end is connected to the pump, and the other end of the pump is respectively connected to the first water outlet pipe and the second water outlet pipe; the third water outlet pipe is respectively connected to each third water storage tank;

[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; 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 disposed in the first channel.

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

[0015] A circle of overflow plates is arranged 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 close to the center of the filter device is lower than the end far from the center of the filter device; there is a gap between the overflow plate and the top edge of the filter device; the 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 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.

[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 plate 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 opening of the wedge-shaped grooves gradually decreases 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] On the other hand, a control method for the above-mentioned solar desalination device is provided, comprising the following steps:

[0023] When the temperature inside the evaporation chamber is greater than a first preset temperature value, the first valve and the second valve are opened, and the opening degree of the first valve is controlled to increase as the temperature inside the evaporation chamber increases, and to decrease as the temperature inside 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, the first valve and the second valve are opened and the opening of the first valve is adjusted to the maximum, and the third valve is closed.

[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 replenishment flow rate increases with the increase of temperature, thereby realizing 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 leading to evaporation weakness during the layer-by-layer transfer of heat energy.

[0030] 3. Use the filtering 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 rapid nucleation, aggregation and growth of droplets at the tail end of the wedge-shaped groove and the condensation migration are significantly improved.

[0033] 6. By adding a baffle bead in the water inlet, the Reynolds number can be quickly reduced, so that liquid and solid can be better separated. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 2 It is a three-dimensional schematic diagram of a solar seawater desalination device in one embodiment of the present invention;

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

[0037] Figure 4 A schematic diagram of the working state of a solar seawater desalination device when 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 desalination device during flushing in one embodiment of the present invention;

[0039] Figure 6 It is an exploded schematic diagram (partial cutaway) of a filtering device in one embodiment of the present invention;

[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 in one embodiment of the present invention;

[0042] Fig. 9 It is a schematic diagram of the structure of the wing plate and the wedge-shaped groove in one embodiment of the present invention;

[0043] Fig.10 The temperature distribution and velocity field distribution diagram of the evaporation chamber in one embodiment of the present invention;

[0044] Fig.11 is a distribution diagram of water vapor partial pressure gradient in an evaporation chamber in one embodiment of the present invention;

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

[0046] Fig.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 in conjunction with the accompanying drawings and specific implementation methods.

[0048] Example 1 See Figure 1-Figure 5 , a solar seawater desalination device, including a solar thermal collector, 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 on the collector 5. The collector 5 is in close contact with the outer side of the first side wall of the evaporation chamber. Preferably, in order to achieve a better heat collection effect, the solar thermal collector is enclosed by the curved bottom plate 1, the side plate 2, the Low-E glass plate 4 and the collector 5 to form a closed cavity. The collector 5 is vertically fitted 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 bottom plate 1. The other end of the curved bottom plate 1 is bent upward and connected to the other end of the Low-E glass plate 4. The concentrator 3 is fitted on the inner wall of the curved bottom plate 1. More preferably, the outer wall of the curved bottom plate 1 is also fitted with thermal insulation cotton.

[0050] The evaporation chamber is also a closed cavity, and a first porous hydrophilic plate 61 is vertically provided on the inner side of the first side wall of the evaporation chamber, which is close to the first side wall. A plurality of second porous hydrophilic plates 62 are vertically provided in the evaporation chamber from the first side wall to the second side wall opposite to the first side wall, and 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, and 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, and a second water reservoir 621 (fresh water pool) is provided at the bottom of each second porous hydrophilic plate 62 on the side facing the first porous hydrophilic plate 61, and a third water reservoir 622 (sea water 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 and effectively solves the problem of evaporation weakening caused by energy attenuation during the layer-by-layer transfer of heat energy.

[0052] A first heat conducting plate 71 is provided on the top of the evaporation chamber. Preferably, in order to better utilize solar energy, a high light transmittance glass 81 and a plurality of spaced solar photovoltaic panels 82 are provided above the first heat conducting plate 71 in order from top to bottom, and a heat conducting silica gel layer 83 is provided between two adjacent solar photovoltaic panels 82. Preferably, the top of the second heat conducting plate 72 is connected to the bottom of the first heat conducting plate 71, so that the heat absorbed by the first heat conducting plate 71 is transferred to the second porous hydrophilic plate 62 through the second heat conducting plate 72, thereby accelerating the evaporation of the liquid in the second porous hydrophilic plate 62.

[0053] Preferably, if Fig. 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, and 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, and the plurality of wedge-shaped grooves 74 are arranged 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 outer side of the wing plate 73 to the inner side 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 condensation migration amount are significantly improved, such as Fig.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 end of the pump 92 is 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 total water reservoir 10 is provided on the side of the bottom of the evaporation chamber, each third water reservoir 622 is connected to the total water reservoir 10, and the total water reservoir 10 is connected to the third outlet pipe 95. A total fresh water tank 20 is provided on the side of the bottom of the evaporation chamber opposite to the total water tank, and each second water reservoir 621 is connected to the total fresh water tank 20.

[0055] Preferably, a fourth water reservoir 623 is further included, and 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 through a pipeline, and a one-way valve is provided on the pipeline to prevent the seawater in the fourth water reservoir 623 from flowing back to the first water reservoir 611.

[0056] The first heat conducting plate 71 is provided with a first channel 201 for connecting the first porous hydrophilic plate 61 with the first water outlet pipe 93, and a second channel 202 for connecting each second porous hydrophilic plate 62 with the second water outlet pipe 94. In essence, the first channel 201 and the second channel 202 are channels dug in the first heat conducting plate 71, and the first channel 201 is 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 in the first channel 201 for heating the liquid flowing through the first channel 201.

[0057] The second water outlet pipe 94 is provided with a first valve 301, the first valve 301 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. The solar photovoltaic panel 82 is electrically connected to the battery 84, and the battery 84 is electrically connected to the pump 92 and the heating device 203 respectively, and the electricity generated by the solar photovoltaic panel 82 is supplied 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, 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 on the top and a funnel-shaped outlet 13 at the center of the bottom, and 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 cross section of the overflow plate 14 is arc-shaped, and the end of the overflow plate 14 close to the center of the filter device 11 is lower than the end away from the center of the filter device 11. There is a gap between the overflow plate 14 and the top edge of the filter device 11. The liquid in the filter device 11 flows out of 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. 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, and the first baffle 15 is located on the radial inner side of the second baffle 16. A funnel-shaped water inlet 17 is provided just above the water outlet 13, and a water inlet pipe 18 is connected to the small end of the water inlet 17, and 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 through a pipeline. A retaining bead 19 is provided in the water inlet 17, and the retaining bead 19 is connected to the inner wall of the water inlet 17 through 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 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 retaining bead 19 is added in the water inlet 17 to quickly reduce the Reynolds number, so that the liquid and solid can be better separated. After the beads 19 are added, the minimum value in the cavity (except for the area near the boundary layer) is reduced to 20. For lighter floccules, the first baffle 15 and the second baffle 16 are used to block them.

[0060] When working, 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] When the device is working during the day, part 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 released heat is absorbed by the fluid in the first channel 201 for preheating. In this working state, the first valve 301 is closed, the second valve 302 is opened, and the third valve 303 is opened. In order to continuously produce fresh water during the day or night when the light is insufficient, the system stores electrical energy in the battery 84 on sunny days, and heats the fluid in the first channel 201 through the heating device 203, so that seawater desalination can continue even in insufficient light. In this working state, the first valve 301 is closed, the second valve 302 is opened, and the third valve 303 is opened.

[0062] When the sunshine is strong in sunny weather (the temperature in the evaporation chamber is greater than the first preset temperature value of 60°C), the evaporation efficiency reaches the peak value, and the water absorption rate of the second porous hydrophilic plate 62 is less 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 with the increase of the temperature in the evaporation chamber and decrease with the decrease of the temperature in the evaporation chamber. The third valve 301 is controlled by the liquid level of the seawater reservoir 622, and is opened when the liquid level drops to the evaporation liquid level (20% of the storage height), and is closed when the water storage upper limit (80% of the storage height) is reached. In this way, seawater flows from top to bottom into each second porous hydrophilic plate 62 through the first outlet pipe 93 and the first channel 201 for water replenishment, and the flow rate increases with the increase of the temperature value. The evaporation efficiency is adaptively adjusted according to the light conditions to improve the 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 by 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] Embodiment 2

[0064] A control method for the above solar desalination device comprises the following steps:

[0065] When the temperature inside the evaporation chamber is greater than a first preset temperature value, the first valve and the second valve are opened, and the opening degree of the first valve is controlled to increase as the temperature inside the evaporation chamber increases, and to decrease as the temperature inside 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 in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the individual embodiments previously disclosed. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

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

[0072] Those skilled in the art will appreciate that the modules in the devices in 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 in addition they may be divided into a plurality of submodules or subunits or subgroups. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, 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 included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present 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. Therefore, a processor with necessary instructions for implementing the method or method elements forms a device for implementing the method or method elements. In addition, 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 combination with hardware or software, or a combination thereof. Thus, the method and apparatus of the present invention, or some aspects or portions of the method and apparatus of the present invention may be in the form of program codes (i.e., instructions) embedded in a tangible medium, such as a floppy disk, a CD-ROM, a hard disk 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 a device for practicing the present invention.

[0076] In the case where 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 transmission mechanism, and includes any information delivery medium. Any combination of the above is 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 is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0079] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, 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 illustrative, not restrictive, with respect to the scope of the present 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 protection scope 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 comprises a heat collector and a condenser for focusing sunlight on 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 of the second porous hydrophilic plates 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 comprises a water inlet pipe, a pump, a first water outlet pipe, a second water outlet pipe and a third water outlet pipe, one end of the water inlet pipe is connected to the seawater, and the other end is connected to the pump, and the other end of the pump is respectively connected to the first water outlet pipe and the second water outlet pipe; the third water outlet pipe is respectively connected to each third water storage tank; Features: 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 in the evaporation chamber.

2. The solar desalination device according to claim 1, characterized in that: 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.

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

4. The solar seawater desalination device according to claim 1 or 2, characterized in that: It also includes a filtering device, wherein a cover plate is provided on the top of the filtering device, a funnel-shaped water outlet is provided at the center of the bottom, and a cavity is formed between the cover plate and the bottom; A circle of overflow plates is arranged 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 close to the center of the filter device is lower than the end far from the center of the filter device; there is a gap between the overflow plate and the top edge of the filter device; the 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.

5. The solar desalination device according to claim 4, 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.

6. The solar desalination device according to claim 2, characterized in that: A plurality of wing plates are vertically arranged on one side of the second heat conducting plate facing the first porous hydrophilic plate, the angle between the wing plate 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.

7. The solar desalination device according to claim 6, characterized in that: A plurality of wedge-shaped grooves are formed on the upper surface of the wing plate, and the plurality of wedge-shaped grooves are arranged in parallel along the width direction of the second heat conducting plate; the opening of the wedge-shaped grooves gradually decreases from the outer side of the wing plate to the inner side of the wing plate.

8. The solar seawater desalination device according to claim 1 or 2, characterized in that: There are four second porous hydrophilic plates; one of which 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 distances between two adjacent second porous hydrophilic plates are 1:2:4 respectively.

9. A control method for a solar desalination device according to claims 1 to 8, characterized in that: The method comprises the following steps: when the temperature inside the evaporation chamber is greater than a first preset temperature value, opening the first valve and the second valve, and controlling the opening degree of the first valve to increase as the temperature inside the evaporation chamber increases, and to decrease as the temperature inside the evaporation chamber decreases; 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; The second valve is arranged on the first water outlet pipe.

10. The control method according to claim 9, characterized in that: The 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.

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