Seawater desalination energy recovery device and recovery method

Abstract

The invention belongs to the technical field of seawater desalination, and particularly relates to a seawater desalination energy recovery device and method. A gas conveying pipe and a water conveying pipe are arranged in the condenser; the air delivery pipe is located outside the water delivery pipe and wraps the water delivery pipe. One end of the gas conveying pipe is communicated with a gas outlet of the solar heat collector; the bottom of the gas conveying pipe is communicated with a group of water collecting pipes; a water inlet head and a water outlet head are respectively arranged at two ends of the water pipe; seawater in the solar heat collector is heated and evaporated through the vacuum heat collecting pipe, formed water vapor enters the air conveying pipe of the condenser through the air outlet and then flows along the interior of the air conveying pipe, and original seawater enters the water conveying pipe through the water inlet head and flows along the interior of the water conveying pipe; steam and seawater reversely flow along the interior of the simulated intestinal tract type pipeline and are separated from each other, heat exchange is continuously carried out between the steam and the seawater through the side wall of the water conveying pipe, and the condensation, heating and energy recovery efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of seawater desalination technology, specifically a seawater desalination energy recovery device and recovery method. Background Technology

[0002] Solar-powered seawater desalination is a technology that uses solar energy as an energy source to remove salt and impurities from seawater through physical or chemical methods, thereby obtaining freshwater suitable for drinking or agricultural and industrial use. This technology typically employs photothermal or photovoltaic conversion, using solar energy to heat seawater for evaporation or drive a reverse osmosis process. Solar-powered seawater desalination offers advantages such as being environmentally friendly and sustainable, making it particularly suitable for regions with energy scarcity and water shortages. Compared to traditional energy-intensive seawater desalination methods, solar-powered seawater desalination significantly reduces energy consumption and operating costs, making it a potential solution to the global water shortage problem.

[0003] Chinese patent application CN102320676B discloses a solar-powered seawater desalination unit. The key technical features include: a heat pipe solar collector, a fan, photovoltaic panels, a rotary regenerative adsorption device, a transmission pipeline, a condenser, and a water storage tank; the rotary regenerative adsorption device comprises a long cylindrical regenerator and an adsorber, both with semi-circular cross-sections, separated by a heat insulation plate; one end of the adsorber is connected to the fan outlet, and the other end faces the condenser; one end of the regenerator is closed, and the other end is connected to one end of the transmission pipeline, the other end of the transmission pipeline is connected to the condenser inlet, and the condenser outlet is connected to the water storage tank; the fan is electrically connected to the photovoltaic panels.

[0004] However, the above technologies have the following drawbacks: after the seawater is heated and vaporized by solar energy, the generated water vapor is usually directly fed into the condenser to form fresh water. The water vapor contains a large amount of waste heat that is not recovered and utilized. Some technologies have adopted the method of exchanging heat between water vapor and the original seawater to achieve the dual function of steam condensation and preheating of seawater. However, the heat exchange efficiency is too low, which makes it difficult to fully recover the heat in the water vapor, and there is still a phenomenon of energy waste.

[0005] Therefore, the present invention provides a seawater desalination energy recovery device and recovery method. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a seawater desalination energy recovery device according to the present invention, comprising a solar collector and a condenser; The solar collector uses vacuum collector tubes to heat and evaporate seawater; the condenser is used to condense and collect the water vapor generated by the solar collector. The condenser is equipped with a gas supply pipe and a water supply pipe; both the gas supply pipe and the water supply pipe are designed to resemble an intestinal tract; the gas supply pipe is located outside the water supply pipe and wraps around it. One end of the gas supply pipe is connected to the gas outlet of the solar collector; a set of water collection pipes are connected to the bottom of the gas supply pipe; water inlet and water outlet are respectively provided at both ends of the water supply pipe; the water outlet is connected to the water inlet of the solar collector through a conduit.

[0008] Preferably, both ends of the water pipe are rotatably connected to a rotating ring; a set of inclined blades are evenly distributed on the surface of the rotating ring; the rotating ring and the blades are both located inside the annular cavity formed between the air pipe and the water pipe.

[0009] Preferably, a set of copper plates are evenly distributed between the inner side of the gas pipe and the outer side of the water pipe; a set of drainage grooves are evenly distributed on the surface of the copper plates; and the drainage grooves of adjacent copper plates are staggered.

[0010] Preferably, the gas supply pipe is slidably fitted inside the condenser; a support ring is fixedly connected inside the gas outlet; the end of the gas supply pipe is sealed and slidably fitted inside the gas outlet; a spring is fixedly connected between the support ring and the gas supply pipe; a set of through holes are evenly distributed at the end of the gas supply pipe; and an annular groove is formed on the inner side of the gas outlet.

[0011] Preferably, a set of fixing plates is fixedly connected inside the condenser between the gas pipes; a set of connecting ropes is evenly distributed on both sides of the fixing plates; the connecting ropes extend into the water pipe and are fixedly connected to an elastic pad; the connecting ropes pass through the side walls of the gas pipe and the water pipe and slide and seal with them; an elastic element is fixedly connected between the elastic pad and the water pipe.

[0012] Preferably, the elastic pad and the side wall of the water pipe form a closed space; a set of guide holes are evenly distributed on the surface of the elastic pad.

[0013] Preferably, a mounting base is fixedly connected inside the water collection pipe; a flow guide groove is provided in the middle of the mounting base; a baffle is hinged to the lower side of the mounting base by a pivot pin; and a spring is fixedly connected between the baffle and the mounting base.

[0014] Preferably, annular recessed groove one and recessed groove two are respectively provided at the bottom of the mounting base and the upper side of the baffle; both recessed groove one and recessed groove two are filled with water-absorbing material.

[0015] A method for recovering energy from seawater desalination, using the aforementioned seawater desalination energy recovery device, includes the following steps: A1. The seawater inside the solar collector is heated and evaporated by the vacuum collector tube. The steam pressure inside the outlet gradually increases, pushing the end of the gas transmission pipe to slide inside the outlet until the steam can enter the gas transmission pipe through the annular groove and through hole. A2. The raw seawater enters the water supply pipe through the inlet head and flows along its interior. The steam and seawater flow in opposite directions and separate from each other along the simulated intestinal-shaped pipe. The two exchange heat through the side wall of the water supply pipe, realizing the condensation of water vapor and preheating of the raw seawater. A3. Water vapor drives the blades and the rotating ring to rotate. The blades apply tangential force to the airflow, causing the steam to form a spiral movement path around the water pipe inside the gas pipe, promoting heat transfer to the seawater. A4. As the condensate collects at the bottom of the gas pipeline, the gravity of the condensate applied to the upper side of the baffle gradually increases, causing the baffle to deflect downwards, and the water inside the gas pipeline is discharged downwards and collected through the guide channel. A5. As the amount of condensate on the upper side of the baffle gradually decreases, the second spring pulls the baffle upward to deflect and reset, and re-closes the guide channel. A6. A water seal is formed by the water-absorbing material in recessed groove one and recessed groove two, which seals the gap between the baffle and the mounting base to prevent water vapor from leaking out through the guide groove.

[0016] The beneficial effects of this invention are as follows: 1. The seawater desalination energy recovery device and method of the present invention heats and evaporates seawater inside a solar collector using a vacuum collector tube. The resulting water vapor enters the gas supply pipe of the condenser through the gas outlet and flows along the inside of the gas supply pipe. At the same time, the raw seawater enters the water supply pipe through the water inlet and flows along its inside. The heat of the steam is conducted to the seawater, thereby recovering and utilizing the waste heat of the water vapor, realizing the condensation of water vapor and preheating of the raw seawater, improving the heating efficiency of the subsequent solar collector for seawater. Furthermore, the steam and seawater flow in opposite directions and are separated from each other along the inside of the simulated intestinal-shaped pipe. The two continuously exchange heat through the side wall of the water supply pipe, which can fully transfer heat from the steam to the seawater, improving the efficiency of condensation, heating and energy recovery.

[0017] 2. The seawater desalination energy recovery device and method of the present invention, by setting multiple copper plates, the heat of steam can be transferred to seawater through the copper plates and water pipes, increasing the heat exchange area between steam and seawater. In addition, the copper plates form a labyrinth structure, and the airflow can only flow through the guide grooves of the copper plates, which promotes the impact, contact and heat exchange of steam on the copper plates, extends the flow path of the airflow, and allows the seawater to fully absorb the waste heat of steam.

[0018] 3. The seawater desalination energy recovery device and method of the present invention, when the seawater inside the solar collector is gradually heated and evaporated to a certain extent, the steam pressure inside the outlet gradually increases, pushing the end of the gas pipe to slide inside the outlet. Spring 1 deforms and extends until the end face of the gas pipe is aligned with the annular groove, and the through hole and the annular groove are interconnected. At this time, the steam inside the outlet can enter the gas pipe through the annular groove and the through hole and depressurize. After that, the gas pressure is insufficient to maintain the deformation of spring 1, so spring 1 pulls the end of the gas pipe to slide back to its original position. When the gas pressure inside the outlet increases again, the above action is repeated to realize that the gas pipe and water pipe as a whole move back and forth in a small amplitude in the condenser, shaking and agitating the water droplets on the surface of the copper sheet, promoting the condensate to flow downward along the guide groove. On the one hand, it improves the collection efficiency of fresh water. On the other hand, after the water droplets on the surface of the copper sheet are removed, the probability of contact between them and the steam increases, continuing to provide an adhesion area for water vapor, preventing the water droplets from blocking a large area of ​​the copper sheet and affecting the heat exchange effect. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of the solar collector and condenser in this invention; Figure 2 This is a schematic diagram of the condenser in this invention; Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the gas transmission pipe in this invention; Figure 5 This is a schematic diagram of the copper sheet structure in this invention; Figure 6 This is a cross-sectional view of the condenser in this invention; Figure 7 yes Figure 6 Enlarged view of a section at point B in the middle; Figure 8 yes Figure 6 Enlarged view of a section at point C; Figure 9 This is a schematic diagram of the method flow of the present invention.

[0021] In the diagram: 1. Solar collector; 2. Condenser; 3. Gas pipe; 4. Water pipe; 5. Gas outlet; 6. Water collection pipe; 7. Water inlet; 8. Water outlet; 9. Pipe; 10. Rotary ring; 11. Blade; 12. Copper sheet; 13. Drainage groove; 14. Support ring; 15. Spring 1; 16. Through hole; 17. Annular groove; 18. Fixing plate; 19. Connecting rope; 20. Elastic pad; 21. Elastic element; 22. Guide hole; 23. Mounting base; 24. Drainage groove; 25. Baffle; 26. Spring 2; 27. Recessed groove 1; 28. Recessed groove 2. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 8 As shown, the seawater desalination energy recovery device of the present invention includes a solar collector 1 and a condenser 2; The solar collector 1 uses a vacuum collector tube to heat and evaporate the seawater inside; the condenser 2 is used to condense and collect the water vapor generated by the solar collector 1. The condenser 2 is equipped with a gas supply pipe 3 and a water supply pipe 4 inside; both the gas supply pipe 3 and the water supply pipe 4 are designed to resemble intestines; the gas supply pipe 3 is located outside the water supply pipe 4 and wraps around the water supply pipe 4; the water supply pipe 4 is made of a heat-conducting material, such as copper, aluminum, graphite, etc. One end of the gas supply pipe 3 is connected to the gas outlet 5 of the solar collector 1; a set of water collection pipes 6 are connected to the bottom of the gas supply pipe 3; the two ends of the water supply pipe 4 are respectively provided with water inlet head 7 and water outlet head 8, and both water inlet head 7 and water outlet head 8 penetrate the side wall of the gas supply pipe 3; the water outlet head 8 is connected to the water inlet of the solar collector 1 through the conduit 9.

[0024] In existing seawater desalination devices, the seawater is heated and vaporized by solar energy. The resulting steam is usually directly fed into the condenser 2 to form fresh water. The steam contains a large amount of waste heat that is not recovered and utilized. Some technologies have adopted the method of exchanging heat between the steam and the original seawater to achieve the dual function of steam condensation and seawater preheating. However, the heat exchange efficiency is too low, which makes it difficult to fully recover the heat in the steam and still results in energy waste.

[0025] This invention heats and evaporates seawater inside the solar collector 1 using a vacuum collector tube. The resulting steam enters the gas supply pipe 3 of the condenser 2 through the outlet 5, specifically into the annular cavity between the gas supply pipe 3 and the water supply pipe 4, and then flows along the inside of the gas supply pipe 3. Simultaneously, the original seawater enters the water supply pipe 4 through the inlet 7 and flows along its interior. The heat of the steam is transferred to the seawater, thereby recovering and utilizing the residual heat of the steam. This achieves steam condensation and preheating of the original seawater, improving the heating efficiency of the subsequent solar collector 1 for the seawater. Furthermore, the steam and seawater flow in opposite directions and separate from each other along the simulated intestinal-like pipe. They continuously exchange heat through the side wall of the water supply pipe 4, which can fully transfer heat from the steam to the seawater, improving the efficiency of condensation, heating, and energy recovery. The resulting condensed freshwater is discharged and collected downwards through the bottom water collection pipe 6, while the heated seawater enters the solar collector 1 through the outlet 8 and the conduit 9 of the water supply pipe 4 to replenish the solar collector 1.

[0026] In another embodiment of the present invention, both ends of the water supply pipe 4 are rotatably connected to a rotating ring 10; a set of inclined blades 11 are evenly distributed on the surface of the rotating ring 10; the rotating ring 10 and the blades 11 are both located inside the annular cavity formed between the air supply pipe 3 and the water supply pipe 4.

[0027] When water vapor enters the gas transmission pipe 3, it can use the airflow to drive the blades 11 and the rotating ring 10 to rotate. The rotating blades 11 can apply tangential force to the airflow, causing the steam to form a spiral motion inside the gas transmission pipe 3. This promotes the transfer of heat from different locations inside the fluid to the seawater through the water transmission pipe 4, improving the condensation efficiency of the steam and enhancing the heating effect on the seawater.

[0028] In another embodiment of the present invention, a set of copper sheets 12 are evenly distributed between the inner side of the gas pipe 3 and the outer side of the water pipe 4; a set of drainage grooves 13 are evenly distributed on the surface of the copper sheets 12; the drainage grooves 13 of adjacent copper sheets 12 are staggered with each other.

[0029] By setting multiple copper plates 12, the heat of the steam can be transferred to the seawater through the copper plates 12 and the water pipe 4, increasing the heat exchange area between the steam and the seawater. Furthermore, the copper plates 12 form a labyrinth structure, and the airflow can only flow through the guide grooves 13 of the copper plates 12, promoting the impact, contact, and heat exchange of the steam on the copper plates 12, extending the flow path of the airflow, and allowing the seawater to fully absorb the residual heat of the steam.

[0030] In another embodiment of the present invention, the gas supply pipe 3 is slidably fitted inside the condenser 2; a support ring 14 is fixedly connected inside the gas outlet 5; the end of the gas supply pipe 3 is sealed and slidably fitted inside the gas outlet 5; a spring 15 is fixedly connected between the support ring 14 and the gas supply pipe 3; a set of through holes 16 are evenly distributed at the end of the gas supply pipe 3; an annular groove 17 is opened on the inner side of the gas outlet 5; the water inlet 7 and water outlet 8 of the water supply pipe 4 are both connected to the pipeline in an elastic connection manner.

[0031] Under normal circumstances, the end face of the gas pipe 3 is misaligned with the annular groove 17, so the gas in the outlet 5 cannot enter the interior of the gas pipe 3. However, as the seawater inside the solar collector 1 is gradually heated and evaporated to a certain extent, the vapor pressure inside the outlet 5 gradually increases, pushing the end of the gas pipe 3 to slide inside the outlet 5. The spring 15 deforms and elongates until the end face of the gas pipe 3 is aligned with the annular groove 17, and the through hole 16 is connected to the annular groove 17. At this time, the vapor inside the outlet 5 can enter the interior of the gas pipe 3 through the annular groove 17 and the through hole 16 and release pressure. After that, the gas pressure is insufficient to maintain the deformation of the spring 15, so the spring 15 pulls the end of the gas pipe 3. Sliding reset: When the internal air pressure of the outlet 5 increases again, the above action is repeated to achieve small-amplitude lateral reciprocating movement of the gas pipe 3 and water pipe 4 inside the condenser 2. Since a large number of water droplets will adhere to the surface of the copper plate 12 during the condensation process, the reciprocating movement of the gas pipe 3 and water pipe 4 can shake and agitate the water droplets on the surface of the copper plate 12, promoting the downward flow of condensate along the guide groove 13. On the one hand, it improves the collection efficiency of fresh water. On the other hand, after the water droplets on the surface of the copper plate 12 are removed, the probability of contact between them and the steam increases, continuing to provide an adhesion area for water vapor and preventing the water droplets from blocking a large area of ​​the copper plate 12 and affecting the heat exchange effect.

[0032] In another embodiment of the present invention, a set of fixing plates 18 are fixedly connected inside the condenser 2 between the gas supply pipes 3; a set of connecting ropes 19 are evenly distributed on both sides of the fixing plates 18; the connecting ropes 19 extend into the water supply pipe 4 and are fixedly connected to an elastic pad 20; the connecting ropes 19 pass through the side walls of the gas supply pipe 3 and the water supply pipe 4 and slide and seal with them; an elastic element 21 is fixedly connected between the elastic pad 20 and the water supply pipe 4.

[0033] During the left and right movement of the gas pipe 3 and the water pipe 4, when the gas pipe 3 moves away from the fixed plate 18, the connecting rope 19 is tightened, and the elastic pad 20 is deformed by the connecting rope 19, which increases the degree of bending and moves towards the axis of the water pipe 4. When the gas pipe 3 approaches the fixed plate 18, the connecting rope 19 is relaxed, and the elastic element 21 drives the elastic pad 20 to contract and recover. The above structure can cause the various elastic pads 20 inside the water pipe 4 to continuously bulge and contract, disturb the seawater inside the pipe, improve its turbulence effect, promote the uniform distribution of seawater at different temperatures, and enhance the heating effect of the seawater.

[0034] The elastic pad 20 and the side wall of the water pipe 4 form a closed space; a set of guide holes 22 are evenly distributed on the surface of the elastic pad 20.

[0035] When the elastic pad 20 bulges towards the middle of the water pipe 4, a negative pressure is generated inside its enclosed space, drawing seawater into the enclosed space through the guide hole 22. When the elastic pad 20 contracts towards the side wall of the water pipe 4, the seawater inside the enclosed space is squeezed out through multiple guide holes 22. The squeezed water flow is dispersed and laterally impacts the flowing seawater, promoting lateral contact between the seawater and the inner wall of the water pipe 4 and heat exchange with the steam, further enhancing the turbulence and mixing effect of the water flow and increasing the heat exchange rate.

[0036] In another embodiment of the present invention, a mounting base 23 is fixedly connected inside the water collection pipe 6; a guide groove 24 is provided in the middle of the mounting base 23; a baffle 25 is hinged to the lower side of the mounting base 23 by a pivot pin; and a spring 26 is fixedly connected between the baffle 25 and the mounting base 23.

[0037] Under normal circumstances, the baffle 25 is pulled tight by the second spring 26 and fits against the lower side of the mounting base 23 to seal the guide groove 24, reducing the downward discharge of steam inside the gas pipe 3 through the water collection pipe 6. As the condensate gradually gathers at the bottom of the gas pipe 3, the gravity of the condensate applied to the upper side of the baffle 25 gradually increases, which overcomes the force of the second spring 26 and causes the baffle 25 to deflect downward at a certain angle. As a result, a gap appears between the free end of the baffle 25 and the mounting base 23. Water at the bottom of the gas pipe 3 can be discharged downward through the guide groove 24 and this gap. Since water passes through the gap during this process, it forms an isolation effect, so water vapor cannot leak downward through this gap. When the condensate on the upper side of the baffle 25 gradually decreases, its gravity can no longer support the downward deflection of the baffle 25. Then the second spring 26 pulls the baffle 25 upward to reset and re-close the guide groove 24, waiting for the condensate to continue to gather inside the gas pipe 3.

[0038] The mounting base 23 and the upper side of the baffle 25 are respectively provided with annular recessed groove 1 27 and recessed groove 28 at corresponding positions; the recessed groove 1 27 and recessed groove 28 are filled with water-absorbing material, such as sponge, cotton cloth, etc.

[0039] When the baffle 25 deflects downward, some of the condensed water will enter the recessed groove 28 and be absorbed by its absorbent material as it flows along the surface of the baffle 25. Therefore, when the baffle 25 deflects upward and resets, the absorbent material inside the recessed groove 27 will come into contact with the absorbent material inside the recessed groove 28 and absorb water from it. The water-absorbing material and the water in it will form a water seal, thereby sealing the gap between the baffle 25 and the mounting base 23. This will further improve the sealing effect of the baffle 25 on the guide groove 24 and prevent water vapor from leaking out through the water collection pipe 6.

[0040] like Figure 9 As shown, the present invention provides a seawater desalination energy recovery method, which uses the aforementioned seawater desalination energy recovery device and includes the following steps: A1. The seawater inside the solar collector 1 is heated and evaporated by the vacuum collector tube. The steam pressure inside the outlet 5 gradually increases, pushing the end of the gas pipe 3 to slide inside the outlet 5 until the steam can enter the gas pipe 3 through the annular groove 17 and the through hole 16. A2. The raw seawater enters the water supply pipe 4 through the water inlet head 7 and flows along its interior. The steam and seawater flow in opposite directions and separate from each other along the simulated intestinal pipe. The two exchange heat through the side wall of the water supply pipe 4 to achieve water vapor condensation and preheat the raw seawater. A3. Water vapor drives the blades 11 and the rotating ring 10 to rotate. The blades 11 apply tangential force to the airflow, causing the steam to form a spiral motion path around the water pipe 4 inside the gas pipe 3, promoting the transfer of heat to the seawater. A4. As the condensate gathers at the bottom of the gas pipe 3, the gravity of the condensate applied to the upper side of the baffle 25 gradually increases, causing the baffle 25 to deflect downwards, and the water inside the gas pipe 3 is discharged downwards and collected through the guide groove 24. A5. After the condensate on the upper side of the baffle 25 gradually decreases, the second spring 26 pulls the baffle 25 upward to deflect and reset, and re-closes the guide groove 24. A6. A water seal is formed by the water-absorbing material in the first recess 27 and the second recess 28 to seal the gap between the baffle 25 and the mounting base 23, so as to prevent water vapor from leaking out through the guide groove 24.

[0041] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0042] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seawater desalination energy recovery device, comprising a solar collector (1) and a condenser (2); The solar collector (1) uses vacuum collector tubes to heat and evaporate the seawater therein; the condenser (2) is used to condense and collect the water vapor generated by the solar collector (1); Its features are: The condenser (2) is equipped with a gas supply pipe (3) and a water supply pipe (4); both the gas supply pipe (3) and the water supply pipe (4) are designed to resemble intestines; the gas supply pipe (3) is located outside the water supply pipe (4) and wraps around the water supply pipe (4); One end of the gas supply pipe (3) is connected to the gas outlet (5) of the solar collector (1); a set of water collection pipes (6) is connected to the bottom of the gas supply pipe (3); the two ends of the water supply pipe (4) are respectively provided with a water inlet (7) and a water outlet (8); the water outlet (8) is connected to the water inlet of the solar collector (1) through a conduit (9).

2. The seawater desalination energy recovery device according to claim 1, characterized in that: Both ends of the water pipe (4) are rotatably connected to a rotating ring (10); a set of inclined blades (11) are evenly distributed on the surface of the rotating ring (10); the rotating ring (10) and the blades (11) are both located inside the annular cavity formed between the gas pipe (3) and the water pipe (4).

3. The seawater desalination energy recovery device according to claim 2, characterized in that: A set of copper plates (12) are evenly distributed between the inner side of the gas pipe (3) and the outer side of the water pipe (4); a set of drainage grooves (13) are evenly distributed on the surface of the copper plates (12); the drainage grooves (13) of adjacent copper plates (12) are staggered.

4. The seawater desalination energy recovery device according to claim 3, characterized in that: The gas supply pipe (3) is slidably fitted inside the condenser (2); a support ring (14) is fixedly connected inside the gas outlet (5); the end of the gas supply pipe (3) is sealed and slidably fitted inside the gas outlet (5); a spring (15) is fixedly connected between the support ring (14) and the gas supply pipe (3); a set of through holes (16) are evenly distributed at the end of the gas supply pipe (3); an annular groove (17) is opened on the inner side of the gas outlet (5).

5. The seawater desalination energy recovery device according to claim 4, characterized in that: A set of fixing plates (18) are fixedly connected inside the condenser (2) between the gas pipe (3); a set of connecting ropes (19) are evenly distributed on both sides of the fixing plate (18); the connecting ropes (19) extend into the water pipe (4) and are fixedly connected to an elastic pad (20); the connecting ropes (19) pass through the side wall of the gas pipe (3) and the water pipe (4) and slide and seal with them; an elastic element (21) is fixedly connected between the elastic pad (20) and the water pipe (4).

6. The seawater desalination energy recovery device according to claim 5, characterized in that: The elastic pad (20) and the side wall of the water pipe (4) form a closed space; a set of guide holes (22) are evenly distributed on the surface of the elastic pad (20).

7. The seawater desalination energy recovery device according to claim 6, characterized in that: The water collection pipe (6) is fixedly connected to a mounting base (23); a guide groove (24) is provided in the middle of the mounting base (23); a baffle (25) is hinged to the lower side of the mounting base (23) by a pivot pin; a spring (26) is fixedly connected between the baffle (25) and the mounting base (23).

8. The seawater desalination energy recovery device according to claim 7, characterized in that: The bottom of the mounting base (23) and the upper side of the baffle (25) are respectively provided with annular recessed groove one (27) and recessed groove two (28); the recessed groove one (27) and recessed groove two (28) are filled with water-absorbing material.

9. A method for recovering energy from seawater desalination, wherein the method employs the seawater desalination energy recovery device as described in claim 8, characterized in that: Includes the following steps: A1. The seawater inside the solar collector (1) is heated and evaporated by the vacuum collector tube. The steam pressure inside the outlet (5) gradually increases, pushing the end of the gas pipe (3) to slide inside the outlet (5) until the steam can enter the gas pipe (3) through the annular groove (17) and the through hole (16). A2. The raw seawater enters the water supply pipe (4) through the inlet head (7) and flows along its interior. The steam and seawater flow in opposite directions and separate from each other along the simulated intestinal pipe. The two exchange heat through the side wall of the water supply pipe (4) to achieve steam condensation and preheat the raw seawater. A3. Water vapor drives the blades (11) and the rotating ring (10) to rotate. The blades (11) apply tangential force to the airflow, causing the steam to form a spiral motion path around the water pipe (4) inside the gas pipe (3), promoting the transfer of heat to the seawater.

10. A method for energy recovery from seawater desalination according to claim 9, characterized in that: It also includes the following steps: A4. As the condensate water gathers at the bottom of the gas pipe (3), the gravity of the condensate water applied to the upper side of the baffle (25) gradually increases, causing the baffle (25) to deflect downwards, and the water inside the gas pipe (3) is discharged downwards and collected through the guide groove (24). A5. After the condensate on the upper side of the baffle (25) gradually decreases, the second spring (26) pulls the baffle (25) upward to deflect and reset, and re-closes the guide groove (24); A6. A water seal is formed by the water absorption of the absorbent material in the first recess (27) and the second recess (28) to seal the gap between the baffle (25) and the mounting base (23) to prevent water vapor from leaking out through the guide groove (24).

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