Asymmetric water delivery high-salinity solar interface evaporator

Abstract

This application discloses a high-salt-tolerant solar interface evaporation device with asymmetric water supply, including a water supply bar and an insulation component. In use, the ends of the strong and weak water supply sections of the water supply bar, away from the solar thermal section, pass through the insulation component and extend into the brine as water-salt transport channels. The brine diffuses upward along the strong and weak water supply sections to the solar thermal section. The solar thermal section heats up under the action of the absorbed solar heat source, causing the water in the brine to evaporate into water vapor and dissipate. The weak water supply section has a diversion function due to the diversion water supply bar, resulting in a slower diffusion rate of the brine. The strong water supply section diffuses the brine faster. The asymmetric structure on both sides creates a unidirectional micro-liquid flow driving force for the brine to flow from the strong water supply section to the weak water supply section. The salt in the brine will return to the brine under the action of the unidirectional micro-liquid flow driving force and will not accumulate on the surface of the solar thermal section, thus affecting the absorption effect of the solar thermal section on sunlight. This can improve the water evaporation effect, increase the evaporation efficiency, and improve the stability of the device.

Description

Technical Field

[0001] This application relates to the field of brine desalination, and more particularly to a high salt-tolerant solar interface evaporator for asymmetric water delivery. Background Technology

[0002] Freshwater resources have always been a scarce resource in my country. Of the total water resources, freshwater accounts for only about 3% of the Earth's total water volume, and much of this freshwater is located in challenging terrains such as glaciers, lakes, and deep groundwater. Therefore, brine desalination has gradually become a new and popular research area. Researching how to successfully desalinate brine and transform it into usable freshwater is crucial. Currently, the mainstream brine desalination technologies include reverse osmosis (RO) and thermal methods, but the conversion efficiency of both methods is not very high.

[0003] In recent years, novel photothermal driven interfaces, as a completely new solar desalination technology, have emerged with advantages such as higher photothermal conversion efficiency, larger scale, and lower cost. They can directly produce domestic and drinking water from brine, making them suitable for medium- to large-scale desalination plants and portable water intake devices. They are particularly suitable for freshwater acquisition in scenarios such as island areas, ships, offshore platforms, and wilderness survival, becoming a research hotspot in the field of brine desalination and potentially a replacement technology for solar distillers. However, during interfacial evaporation, water diffuses out in a gaseous state, while salt in the water precipitates at the interface due to supersaturation, hindering the performance and stability of the evaporator and even causing structural damage. Therefore, researching how to achieve salt reflux and diffusion to prevent salt precipitation at the interface from affecting solar energy absorption is particularly important. Summary of the Invention

[0004] This application provides a high salt-tolerant solar interface evaporation device with asymmetric water supply, which solves the problem in the prior art where salt in the brine is absorbed and accumulates at the interface, affecting the solar energy absorption effect of the evaporation device and resulting in poor evaporation effect.

[0005] To address the aforementioned technical problems, this application provides a highly salt-tolerant solar interface evaporation device for asymmetric water supply, comprising:

[0006] The water delivery strip and the heat insulation component are fixed at the port of the container containing brine. The water delivery strip includes a strong water delivery section, a light and heat section and a weak water delivery section in sequence. The ends of the strong water delivery section and the weak water delivery section away from the light and heat section pass through the heat insulation component and extend into the brine. Diverting water delivery strips are provided on both sides of the weak water delivery section, and both ends of the diverting water delivery strips are connected to the weak water delivery section.

[0007] Preferably, the insulation component is any one of foam board, wood board, or aerogel board.

[0008] Furthermore, both the strong water conveying section and the weak water conveying section are strip-shaped hydrophilic porous fiber cloths.

[0009] It should be noted that the photothermal part includes two layers of hydrophilic porous fiber cloth.

[0010] Preferably, the width of the strong water conveying section is equal to the width of the photothermal section, and the width of the weak water conveying section gradually narrows from the connection point with the photothermal section.

[0011] Furthermore, the diversion water conveyance strips are arranged in an arc shape and are asymmetrically distributed on both sides of the weak water conveyance section.

[0012] Compared with the prior art, this application discloses a high salt-tolerant solar interface evaporation device with asymmetric water supply, including a water supply bar and an insulation component. The insulation component is fixed at the port of a container filled with brine. The water supply bar includes a strong water supply section, a photothermal section and a weak water supply section in sequence. In use, the ends of the strong water supply section and the weak water supply section away from the photothermal section pass through the insulation component and extend into the brine. Diverting water supply bars are provided on both sides of the weak water supply section, and both ends of the diverting water supply bars are connected to the weak water supply section. The strong and weak water conveyance sections are submerged in the brine, serving as water-salt transport channels. The brine diffuses upwards through these sections to the solar-thermal section. The solar-thermal section heats up under the influence of absorbed solar energy, causing the water in the brine to evaporate as water vapor. The weak water conveyance section, equipped with diversion strips, has a diversion function, resulting in slower brine diffusion. In contrast, the brine diffuses faster in the strong water conveyance section. This asymmetrical structure creates a unidirectional micro-fluid flow driving force, causing the salt in the brine to return to the brine under this force, preventing it from accumulating on the surface of the solar-thermal section and affecting its absorption of sunlight. Ultimately, this successfully achieves the evaporation of water from the brine without the remaining salt precipitating at the solar-thermal interface due to supersaturation. This improves the evaporation effect, increases evaporation efficiency, and enhances production profits. Attached Figure Description

[0013] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0014] Figure 1 A schematic diagram of a highly salt-tolerant solar interface evaporation device for asymmetric water delivery provided in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of a water conveying strip provided in an embodiment of the present invention;

[0016] In the diagram: 1. Water delivery strip; 2. Insulation component; 3. Brine; 4. Container; 11. Strong water delivery section; 12. Light and heat section; 13. Weak water delivery section; 5. Diversion water delivery strip. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0018] The core of this application is to provide a high salt-tolerant solar interface evaporation device for asymmetric water supply, which can solve the problem in the prior art where salt in the brine is absorbed and accumulates at the interface, affecting the solar energy absorption effect of the evaporation device and resulting in poor evaporation effect.

[0019] Figure 1 This is a schematic diagram of a highly salt-tolerant solar interface evaporation device for asymmetric water supply provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a water conveying strip provided in an embodiment of the present invention, as shown below. Figures 1 to 2 As shown in the diagram. The arrows in the diagram indicate the direction of water flow.

[0020] Currently, solar evaporators primarily employ passive designs, utilizing the concentration difference between the evaporation site and the water below to achieve passive salt recirculation and diffusion, thus preventing salt precipitation. Specific designs fall into four main categories: First, manually removing precipitated salt through washing or draining it from the edge of the evaporation site; second, using hydrophobic effects to trap water and salt beneath the photothermal material, then allowing salt recirculation through the concentration difference between the material and the water; third, utilizing the low evaporation rate at night to dissolve and recirculate salt accumulated during the day; and fourth, using a three-dimensional water supply channel to enhance the diffusion mode and facilitate salt recirculation. However, these methods are limited by the passive concentration diffusion rate, allowing for intermittent operation or stable operation only under low light intensity (below twice the standard solar intensity) and salt concentration (below 5 wt% salinity).

[0021] To address the shortcomings of current salt-resistant designs and achieve uninterrupted stable operation of solar evaporators under high light intensity and high salt concentration conditions, a special evaporator structural design is needed to rapidly remove salt during high-speed evaporation, preventing its accumulation and precipitation. Passive low-concentration diffusion rates cannot meet the requirements for continuous operation under strong light concentration and high salt conditions. Therefore, the main objective of this application is to design a highly salt-resistant solar interface evaporation device with asymmetric water delivery that can actively remove salt in a timely manner based on different evaporation rates / salt accumulation rates.

[0022] Example 1

[0023] A high-salt-tolerant solar interface evaporation device with asymmetric water supply includes a water supply strip 1 and an insulation component 2. The insulation component 2 is fixed at the port of a container 4 containing brine 3. The water supply strip 1 includes a strong water supply section 11, a photothermal section 12, and a weak water supply section 13. The insulation component 2 is used to separate the photothermal section 12 and the brine 3. Both the strong water supply section 11 and the weak water supply section 13 are made of strip-shaped hydrophilic porous fiber cloth. The photothermal section 12 includes two layers of hydrophilic porous fiber cloth. Specifically, a hydrophilic porous fiber cloth with photothermal function is loaded on a layer of hydrophilic porous fiber cloth. The upper layer is a light-absorbing layer, and the lower layer is a hydrophilic porous fiber cloth connecting the strong water supply section 11 and the weak water supply section 13, which serves as a photothermal conversion and vapor escape site. The ends of the strong water conveying section 11 and the weak water conveying section 13 away from the light and heat section 12 respectively pass through the heat insulation member 2 and extend into the brine 3, serving as water and salt transmission channels. Diverting water conveying strips 5 are provided on both sides of the weak water conveying section 13, and both ends of the diverting water conveying strips 5 are connected to the weak water conveying section 13. The arrangement of the weak water conveying section 13 in conjunction with the diverting water conveying strips 5 can enable the weak water conveying section 13 to have a water flow slowing effect. The asymmetrical arrangement of the strong water conveying section 11 and the weak water conveying section 13 can form a unidirectional micro-liquid flow driving force from the strong water conveying section 11 to the weak water conveying section 13.

[0024] Example 2

[0025] A high-salt-tolerant solar interface evaporator with asymmetric water delivery, to improve insulation and ensure fixation of the strong water delivery section 11 and the weak water delivery section 13, preferably, the insulation component 2 can be any one of foam board, wood board, or aerogel board. To improve evaporation effect and water delivery intensity of the strong water delivery section 11, preferably, the width of the strong water delivery section 11 can be set to be the same as the width of the photothermal section 12, and the width of the weak water delivery section 13 gradually narrows from the connection with the photothermal section 12. The weak water delivery section 13 has the same width at the connection with the photothermal section 12, but because the weak water delivery section 13 is provided with a diversion water delivery strip 5, the water supply line can be diverted and the flow of the main stream can be offset to a certain extent by the tributary, thereby producing a water supply deceleration effect, so that the water supply rate and water supply volume of the weak water delivery section 13 are lower than those of the strong water delivery section 11, thus generating a unidirectional micro-liquid flow driving force from the strong water delivery section 11 to the weak water delivery section 13.

[0026] To improve the diversion effect, preferably, the diversion water conveying strip 5 can be set in an arc shape and arranged asymmetrically on both sides of the weak water conveying section 13, that is, the diversion water conveying strip 5 is arranged alternately on both sides of the weak water conveying section 13. Of course, the diversion water conveying strip 5 can also be arranged symmetrically with respect to the weak water conveying section 13, and the diversion water conveying strip 5 can also be a line segment, with at least one diversion water conveying strip 5 provided.

[0027] This application discloses a high salt-tolerant solar interface evaporation device with asymmetric water supply, including a water supply bar 1 and an insulation component 2. The insulation component 2 is fixed at the port of a container 4 containing brine 3. The water supply bar 1 includes a strong water supply section 11, a photothermal section 12 and a weak water supply section 13 in sequence. In use, the ends of the strong water supply section 11 and the weak water supply section 13 away from the photothermal section 12 pass through the insulation component 2 and extend into the brine 3. Diverting water supply bars 5 are provided on both sides of the weak water supply section 13, and both ends of the diverting water supply bars 5 are connected to the weak water supply section 13. The strong water conveyance section 11 and the weak water conveyance section 13 are submerged in the brine 3, serving as water-salt transport channels. The brine 3 diffuses upwards along the strong and weak water conveyance sections 11 and 13, reaching the solar-thermal section 12. The solar-thermal section 12 heats up under the influence of absorbed solar energy, causing the water in the brine 3 to evaporate into water vapor and escape. This escaped water vapor can be recovered by a subsequent recycling system for use as domestic water. The weak water conveyance section 13, due to the presence of diversion strips 5, has a diversion function, resulting in slower diffusion of the brine 3. In contrast, the brine 3 diffuses faster in the strong water conveyance section 11. This asymmetrical structure on both sides... The structure creates a unidirectional micro-liquid flow driving force for the brine 3 from the strong water conveyance section 11 to the weak water conveyance section. Under the action of the unidirectional micro-liquid flow driving force, the salt in the brine 3 will return to the brine. Only a small portion will precipitate at the end of the photothermal section 12 near the weak water conveyance section 13. It will not accumulate on a large area of ​​the surface of the photothermal section 12 and affect the absorption effect of the photothermal section 12 on sunlight, thereby affecting the evaporation effect of the brine 3. In the end, the evaporation of water in the brine is successfully achieved, and the remaining salt will not precipitate at the interface of the photothermal section due to supersaturation. This can improve the water evaporation effect, increase the evaporation efficiency, and increase production benefits.

[0028] The evaporation device provided in this application can actively remove salt from the solar thermal unit back to the water body below, achieving optimal evaporation and salt resistance performance under different light intensities and salt concentrations. In brine desalination applications, it can maintain efficient, stable, and uninterrupted steam generation for extended periods. Furthermore, the evaporation device allows solar thermal heating to occur only at the air / surface water interface, thereby increasing the solar energy conversion efficiency to over 80%.

[0029] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0030] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A high-salt-tolerant solar interface evaporator with asymmetric water supply, characterized in that, include: Water delivery strip (1) and heat insulation component (2), the heat insulation component (2) is fixed at the port of container (4) containing brine (3), the water delivery strip (1) includes a strong water delivery section (11), a light and heat section (12) and a weak water delivery section (13) in sequence, the end of the strong water delivery section (11) and the weak water delivery section (13) away from the light and heat section (12) respectively penetrates the heat insulation component (2) and extends into the brine (3), the two sides of the weak water delivery section (13) are provided with diversion water delivery strips (5), and both ends of the diversion water delivery strips (5) are connected to the weak water delivery section (13); The diversion water conveyance strip (5) is arranged in an arc shape and is asymmetrically distributed on both sides of the weak water conveyance section (13).

2. The high salt-tolerant solar interface evaporator for asymmetric water supply according to claim 1, characterized in that, The insulation component (2) is any one of foam board, wood board, or aerogel board.

3. The high salt-tolerant solar interface evaporator for asymmetric water supply according to claim 1, characterized in that, Both the strong water conveying section (11) and the weak water conveying section (13) are strip-shaped hydrophilic porous fiber cloths.

4. The high salt-tolerant solar interface evaporator for asymmetric water supply according to claim 3, characterized in that, The photothermal unit (12) comprises two layers of hydrophilic porous fiber cloth.

5. A high-salt-tolerant solar interface evaporator for asymmetric water supply according to claim 4, characterized in that, The width of the strong water delivery section (11) is equal to the width of the photothermal section (12), and the width of the weak water delivery section (13) gradually narrows from the connection point with the photothermal section (12).

Images