CN110563064A - Solar distillation device with interface heating function - Google Patents
Solar distillation device with interface heating function Download PDFInfo
- Publication number
- CN110563064A CN110563064A CN201910941081.8A CN201910941081A CN110563064A CN 110563064 A CN110563064 A CN 110563064A CN 201910941081 A CN201910941081 A CN 201910941081A CN 110563064 A CN110563064 A CN 110563064A
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- China
- Prior art keywords
- water
- solar
- interface
- pipe
- heat
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000004821 distillation Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000001704 evaporation Methods 0.000 claims abstract description 23
- 239000011521 glass Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000008020 evaporation Effects 0.000 claims abstract description 21
- 239000011810 insulating material Substances 0.000 claims abstract description 12
- 239000011358 absorbing material Substances 0.000 claims abstract description 10
- 239000013505 freshwater Substances 0.000 claims abstract description 10
- 238000010248 power generation Methods 0.000 claims abstract description 5
- 239000012774 insulation material Substances 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims 2
- 239000003381 stabilizer Substances 0.000 claims 2
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 239000002918 waste heat Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses an interface heating solar distillation device which comprises an overflow water storage tank, a double-layer glass cover plate, a photovoltaic panel, a water collecting tank, a solar energy absorbing material, a heat insulating material, a hydrophilic material, an evaporation tank body and a pipeline part. The device can realize the function of heating and evaporating water at the interface, and can reduce the heat loss of the heat energy converted by solar energy to the environment by combining with a heat insulation design, and the cooling of the glass plate can simultaneously recover and utilize the latent heat released by the condensation of water vapor and the waste heat generated by photovoltaic power generation. The fresh water yield per unit area and the solar energy utilization rate of the device are greatly improved compared with those of the traditional passive solar distiller.
Description
Technical Field
The invention belongs to the technical field of solar seawater desalination, and particularly relates to a solar distillation device for heating an interface.
Background
The conventional seawater desalination methods mainly include the following types: distillation, reverse osmosis, dialysis, multi-effect distillation, multi-stage flash evaporation, etc., but these methods all require the consumption of conventional energy to drive the system to produce fresh water. Compared with the conventional energy, the solar energy resource has the advantages of inexhaustibility, cleanness and safety. The solar distiller is a device for distilling seawater or brackish water by using solar energy to obtain fresh water. The traditional solar still has a very simple structure and mainly consists of a water tank with black-coated bottom and filled with raw material water and a glass cover plate covering the water tank. The lower part of the glass cover plate is provided with a water collecting tank which is connected with an external water collecting device. Sunlight irradiates the bottom of the water tank through the glass cover plate, the bottom of the water tank is heated by the sunlight, raw material water in the water tank is heated to generate water vapor, and the water vapor is condensed into water drops after rising to be in contact with the glass cover plate. The water droplets flow by gravity along the inclined glass cover plate into the water collection sump and then into the water collection device. However, although the conventional solar still has a simple structure, the absorbed solar energy is converted into heat energy, and then the whole water in the water tank needs to be heated and heated, and then evaporated to generate steam. Because the specific heat capacity of water is large, most of heat is used in the process of heating and heat loss to the environment, so that the solar energy utilization rate of the distiller is low, the water yield per unit area is low, and the popularization and the application of the distiller are greatly limited. In order to improve the performance, researchers propose that a solar heat collector is introduced to improve the photothermal conversion efficiency, a condenser is introduced to improve the temperature of an evaporation water body, a multi-effect distiller is introduced to reuse latent heat, and the like. The method improves the water yield per unit area of the distiller to a certain extent, but also has the problems of equipment investment per unit yield increase, difficult operation of the device and the like.
Disclosure of Invention
In order to solve the technical problems of large heat loss and low solar energy utilization rate of the distiller in the background, the invention provides an interface heating solar energy distillation device. The solar water heater comprises an overflow water storage tank, a double-layer glass cover plate, a photovoltaic panel, a water collecting tank, a solar energy absorbing material, a heat insulating material, a hydrophilic material, an evaporation tank body and a pipeline part; the solar water heater is characterized in that a water inlet pipe is connected with an overflow water storage tank, an overflow plate is arranged in the overflow water storage tank, the overflow water storage tank is directly communicated with a double-layer glass cover plate, the double-layer glass cover plate is communicated with a photovoltaic plate back water channel through a connecting pipe, the photovoltaic plate back water channel is connected with an evaporation tank body through a connecting pipe, a thermal insulation material is arranged at the bottom of the evaporation tank body, a hydrophilic material is covered on the thermal insulation material, a solar energy absorption material is covered on the hydrophilic material, water collecting grooves are distributed on the side wall of the evaporation tank body, and.
Furthermore, the inlet tube is connected to the outlet of the water pump, and raw water after coarse filtration is pumped by the water pump to enter the overflow water storage tank.
Furthermore, the outer surface of the evaporation box body is wrapped by a heat-insulating material, and the inner surface of the evaporation box body is coated with a reflective coating.
Furthermore, the connecting pipe and the connecting pipe can be made of PVC pipes, PE pipes, copper pipes, aluminum pipes or other hard materials.
Furthermore, after the back of the photovoltaic panel is subjected to waterproof treatment, the back of the photovoltaic panel is provided with a water feeding channel.
Furthermore, two conducting wires led out from the photovoltaic panel are connected to the solar power generation voltage stabilizing device, and then the conducting wires led out from the solar power generation voltage stabilizing device are connected to the water pump.
Further, the area of the photovoltaic panel is calculated and required to be at a solar radiation intensity (1000W/m)2) The generated power is larger than the rated power of the water pump.
Further, the solar energy absorbing material is a hydrophilic porous material having a high absorptivity to sunlight.
Furthermore, the thermal conductivity coefficient of the thermal insulation material is less than or equal to 0.12, the density of the thermal insulation material is less than that of water, and the thermal insulation material can float on the water surface; the insulating material has the pore channels uniformly distributed thereon and the pore channels are densely filled with cotton wool.
Furthermore, the hydrophilic material is cotton fiber or other synthetic hydrophilic fiber materials, is laid on the heat insulation material and is in tight contact with the cotton wool in the pore channel.
The invention has the following beneficial effects:
1. The device of the invention can prepare fresh water by only utilizing solar energy without using conventional energy at all;
2. The device provided by the invention improves the shielding problem of the side wall of the evaporation box body on incident sunlight, so that the solar energy absorption material can receive more illumination;
3. The device reduces the temperature of the double-layer glass cover plate, improves the condensation effect of water vapor, and greatly improves the water yield per unit area compared with the common passive solar distiller at present;
4. The device reduces the heat loss from the heat energy converted by solar energy to the non-evaporation water body, simultaneously recovers the latent heat condensed by water vapor and the waste heat generated by photovoltaic power generation, and further improves the utilization rate of photo-thermal;
5. The device has the advantages of simple structure, low manufacturing cost, low maintenance cost and long service life.
drawings
FIG. 1 is a schematic structural view of an interface heated solar still apparatus according to the present invention;
FIG. 2 is a three-dimensional view of the interface heated solar still apparatus of the present invention;
FIG. 3 is an exploded view of the interface heated solar still apparatus of the present invention;
wherein: 1-water inlet pipe; 2-a water inlet; 3-an overflow plate; 4-an overflow water storage tank; 5-double-layer glass cover plate; 6-water outlet; 7-connecting pipe; 8-a photovoltaic panel; 9-pipe connection; 10-rich liquid drainage port; 11-a fresh water outlet; 12-a water inlet; 13-fresh water outlet; 14-a water collecting tank; 15-a water collecting tank; 16-a solar energy absorbing material; 17-an insulating material; 18-a pore channel; 19-a hydrophilic material; 20-evaporating the box body; 21-fresh water collecting pipe; 22-rich liquid drainage pipe
Detailed Description
In order to more clearly describe the technical contents of the present invention, the detailed operation of the apparatus from the feed water to the distilled water is given below. The invention is further illustrated with reference to the following figures and examples.
The invention provides an interface heating solar distillation device, which comprises the following working procedures:
The raw material water after rough filtration is pumped by a water pump and stored in an overflow water storage tank 4) through a water inlet pipe 1) and a water inlet 2). In the process, the electric energy required by the water pump to work is provided by the photovoltaic panel 8. The area of the photovoltaic panel 8 is obtained by calculation, which is required to be within one phaseThe solar radiation intensity is 1000W/m2The generated power is larger than the rated power of the water pump.
When the water level in the overflow water storage tank 4 is higher than the overflow plate 3, raw material water forms a uniform water film under the action of gravity and flows downwards into the double-layer glass cover plate 5 with a hollow inner part; further, the water film flows down along the channel in the middle of the double-glass cover plate 5. The water flows to take away the heat released by the condensation of the water vapor, thereby reducing the temperature of the wall surface of the double-layer glass cover plate 5, reducing the temperature difference between the water vapor and the double-layer glass cover plate 5 and improving the condensation effect of the water vapor.
Raw water further flows into the adapter tube 7 through the water outlet 6; then, the raw water flows through a water flow channel at the back of the photovoltaic panel 8 under the action of gravity; then, the water flows further into the adapter 9; finally, the raw water flows into the evaporation tank 20 through the water inlet 12.
after a certain amount of raw material water is stored in the evaporation tank body 20, the heat insulation material 17 with density smaller than that of water floats on the water surface under the action of buoyancy. Further, the cotton wool in the pore channels 18 inside the heat insulating material 17 absorbs water due to capillary action, and the heat insulating material 17 is in close contact with the hydrophilic material 19, so that the hydrophilic material 19 and the solar energy absorbing material 16 are slowly soaked by the raw material water. When the raw water level in the evaporation tank 20 is higher than the rich water outlet 10, the excess raw water is discharged through the rich water outlet 10.
Sunlight irradiates to the surface of the solar energy absorption material 16 through the double-layer glass cover plate 5, and the solar energy absorption material 16 converts the solar energy into heat energy which is mainly used for heating water molecules on the surface part of the solar energy absorption material 16. When the water molecules are heated to reach a saturated state, the water molecules gradually change from a liquid state to a gas state and are separated from the solar energy absorbing material 16. In the process, the solar energy absorbing material 16 has better illumination conditions at different times of the day due to the reflection of light from the inner surface of the side wall of the evaporation tank 20.
Condensation occurs when gaseous water molecules that have been detached from the solar absorbing material 16 rise to meet the lower surface of the double-glazed cover 5. The condensate flows downwards along the lower surface of the double-layer glass cover plate 5 along the wall under the action of gravity, and when more and more condensate accumulates at the lower part of the double-layer glass cover plate 5, the condensate drops downwards into the water collecting tank 14. At the same time, there will be a small portion of condensed liquid on the inner surface of the side wall of the evaporation tank 20, and this portion of liquid will eventually drip into the water collection sump 15. The condensed liquid in the water collecting tank 14 flows out through the water outlet 13, and the condensed liquid in the water collecting tank 15 flows out through the fresh water outlet 11. Finally, the two liquid portions are collected in the fresh water collecting pipe 21.
Finally, it should be noted that: the above description is only for the preferred embodiment of the present invention and should not be used to limit the scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. an interface heating solar distillation device comprises an overflow water storage tank (4), a double-layer glass cover plate (5), a photovoltaic panel (8), water collecting grooves (14) and (15), a solar energy absorbing material (16), a heat insulating material (17), a hydrophilic material (19), an evaporation tank body (20) and a pipeline part; the solar water heater is characterized in that a water inlet pipe (1) is connected with an overflow water storage tank (4), an overflow plate (3) is arranged in the overflow water storage tank (4), the overflow water storage tank (4) is directly communicated with a double-layer glass cover plate (5), the double-layer glass cover plate (5) is communicated with a back water channel of a photovoltaic plate (8) through a connecting pipe (7), the back water channel of the photovoltaic plate (8) is connected with an evaporation tank body (20) through a connecting pipe (9), a heat insulation material (17) is arranged at the bottom of the evaporation tank body (20), a hydrophilic material (19) is covered on the heat insulation material (17), a solar energy absorption material (16) is covered on the hydrophilic material (19), water collecting grooves (14) and (15) are distributed on the side wall of the evaporation tank body (20), and a fresh water collecting pipe (21) and.
2. The solar still apparatus with interface heating as claimed in claim 1, wherein the water inlet pipe (1) is connected to the outlet of a water pump, and the raw water after coarse filtration is pumped into the overflow water storage tank (4).
3. an interface heating solar still as claimed in claim 1, wherein the evaporation chamber (20) is coated with a heat insulating material on its outer surface and a light reflecting coating on its inner surface.
4. An interface heating solar still apparatus as claimed in claim 1, wherein said connecting pipes (7) and (9) are any one of rigid material pipes selected from PVC pipe, PE pipe, copper pipe and aluminum pipe.
5. an interface heating solar still apparatus according to claim 1, wherein the two conducting wires on the back of said photovoltaic panel (8) are coated with waterproof material, and the back of said photovoltaic panel (8) is provided with water channels.
6. An interface heating solar still as claimed in claim 1, wherein two wires from said photovoltaic panel (8) are connected to a solar power voltage stabilizer, and then from said solar power voltage stabilizer to a water pump.
7. an interface heated solar still apparatus according to claim 1 or 6 wherein the area of the photovoltaic panel (8) is calculated to provide a power generation at a solar radiation intensity greater than the rated power of the water pump.
8. An interface heated solar still apparatus according to claim 1 wherein said solar absorbing material (16) is a hydrophilic porous material having a high absorption of sunlight.
9. an interface heated solar still apparatus according to claim 1 wherein said insulating material (17) has a thermal conductivity less than or equal to 0.12 and a density less than that of water; the heat insulating material (17) is provided with pore channels (18) uniformly distributed, and the pore channels (18) are tightly filled with cotton wool.
10. An interface heating solar still apparatus as claimed in claim 1, wherein said hydrophilic material (19) is cotton fibre or other synthetic hydrophilic fibre material, which is laid over the insulating material (17) and in intimate contact with the cotton wool in the channels (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910941081.8A CN110563064A (en) | 2019-09-30 | 2019-09-30 | Solar distillation device with interface heating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910941081.8A CN110563064A (en) | 2019-09-30 | 2019-09-30 | Solar distillation device with interface heating function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110563064A true CN110563064A (en) | 2019-12-13 |
Family
ID=68783607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910941081.8A Pending CN110563064A (en) | 2019-09-30 | 2019-09-30 | Solar distillation device with interface heating function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110563064A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111302423A (en) * | 2020-02-20 | 2020-06-19 | 安徽大学 | Solar water purifier based on interface solar photothermal conversion |
| CN111847556A (en) * | 2020-06-24 | 2020-10-30 | 北京理工大学 | Solar distillation unit and distillation method |
| CN111994984A (en) * | 2020-08-28 | 2020-11-27 | 嵊州市慧洁日用品有限公司 | Self-adaptive solar water purifier |
| CN113501557A (en) * | 2021-06-11 | 2021-10-15 | 北京化工大学 | Solar water dispenser based on honeycomb bionic evaporator |
| CN113979504A (en) * | 2021-12-27 | 2022-01-28 | 中南大学 | Solar interface evaporator based on pine-tree-shaped bionic structure design |
| CN114804285A (en) * | 2022-05-23 | 2022-07-29 | 安徽农业大学 | Double-electrode mobile phase photocatalysis organic wastewater degradation device driven by sunlight |
| CN114939281A (en) * | 2022-06-15 | 2022-08-26 | 广东五星太阳能股份有限公司 | Solar distillation device convenient to maintain and efficient in distillation |
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| CN202016888U (en) * | 2011-01-13 | 2011-10-26 | 北京理工大学 | Multistage overlaid-disc type solar still with crumpled condensation bottom surface |
| CN108569811A (en) * | 2018-04-26 | 2018-09-25 | 清华大学 | The device of sewage purification is carried out using solar energy based on optical-thermal conversion material |
| CN109231325A (en) * | 2018-10-16 | 2019-01-18 | 武汉大学 | Solar heat focuses REFRIGERATION SYSTEM DRIVEN BY CAPILLARY FORCE multistage seawater desalination system |
| CN211733892U (en) * | 2019-09-30 | 2020-10-23 | 天津大学 | Solar distillation device with interface heating function |
-
2019
- 2019-09-30 CN CN201910941081.8A patent/CN110563064A/en active Pending
Patent Citations (4)
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| CN202016888U (en) * | 2011-01-13 | 2011-10-26 | 北京理工大学 | Multistage overlaid-disc type solar still with crumpled condensation bottom surface |
| CN108569811A (en) * | 2018-04-26 | 2018-09-25 | 清华大学 | The device of sewage purification is carried out using solar energy based on optical-thermal conversion material |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111302423A (en) * | 2020-02-20 | 2020-06-19 | 安徽大学 | Solar water purifier based on interface solar photothermal conversion |
| CN111847556A (en) * | 2020-06-24 | 2020-10-30 | 北京理工大学 | Solar distillation unit and distillation method |
| CN111847556B (en) * | 2020-06-24 | 2022-09-06 | 北京理工大学 | Solar distillation unit and distillation method |
| CN111994984A (en) * | 2020-08-28 | 2020-11-27 | 嵊州市慧洁日用品有限公司 | Self-adaptive solar water purifier |
| CN113501557A (en) * | 2021-06-11 | 2021-10-15 | 北京化工大学 | Solar water dispenser based on honeycomb bionic evaporator |
| CN113979504A (en) * | 2021-12-27 | 2022-01-28 | 中南大学 | Solar interface evaporator based on pine-tree-shaped bionic structure design |
| CN113979504B (en) * | 2021-12-27 | 2022-03-25 | 中南大学 | Solar interface evaporator based on pine-tree-shaped bionic structure design |
| CN114804285A (en) * | 2022-05-23 | 2022-07-29 | 安徽农业大学 | Double-electrode mobile phase photocatalysis organic wastewater degradation device driven by sunlight |
| CN114804285B (en) * | 2022-05-23 | 2024-01-16 | 安徽农业大学 | Sunlight-driven double-electrode mobile phase photocatalytic organic wastewater degradation device |
| CN114939281A (en) * | 2022-06-15 | 2022-08-26 | 广东五星太阳能股份有限公司 | Solar distillation device convenient to maintain and efficient in distillation |
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