Evaporation device for seawater desalination

Abstract

The invention belongs to the technical field of seawater desalination, and particularly discloses an evaporation device for seawater desalination, which comprises a device main body, a preheating tank and an evaporation tank are fixedly mounted in the device main body, the top of the preheating tank is fixedly connected with a first connector, and the top of the evaporation tank is fixedly connected with a second connector. A steam pipe and a seawater pipe are fixedly connected between the first connector and the second connector; the preheating assembly is used for preheating seawater and cooling steam, and the preheating assembly is connected with the preheating tank and the first connector; the liquid discharge assembly is used for concentrating and discharging the preliminarily evaporated seawater, and the liquid discharge assembly is connected with the evaporation tank and the second connector. By arranging the heat exchange assembly, the steam and the seawater can be subjected to sufficient heat exchange, and the situations that the seawater is not subjected to sufficient heat exchange and the steam is not subjected to sufficient cooling due to the fact that the heat exchange time of the seawater and the steam is too short, consumption of subsequent seawater heating and evaporation is too large, and the subsequent steam cooling pressure is increased are avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of seawater desalination, and particularly relates to an evaporation device for seawater desalination. BACKGROUND

[0002] Seawater desalination, that is, producing fresh water by desalting seawater, is an open-source incremental technology for realizing water resource utilization, can increase the total amount of fresh water, and is not affected by time and space and climate, so as to guarantee stable water supply for coastal residents and industrial boiler water replenishment, etc. Seawater desalination methods include seawater freezing method, electrodialysis method, distillation method, reverse osmosis method, and ammonium carbonate ion exchange method, and the application of reverse osmosis membrane method and distillation method is the mainstream in the market.

[0003] In the method of seawater desalination by evaporation such as distillation, the evaporated steam is usually used to preheat the seawater to be heated and evaporated, so as to reduce the cost of heating the seawater and reduce the temperature of the steam, and reduce the pressure of subsequent steam cooling and condensation, but the steam in the prior art only heats the seawater to be evaporated, and the preheating time of the seawater is short, resulting in a large amount of heat waste in the steam and the high-temperature fresh water condensed from the steam, and the preheating effect of the seawater is poor. Meanwhile, when the evaporation device evaporates seawater, the seawater with increased salt content after preliminary evaporation is directly discharged, and the discharged seawater is either discharged into the sea or introduced into an evaporation pond, which will cause waste and loss of the evaporated steam. In view of this problem, how to design an evaporation device for seawater desalination has become a problem to be solved at present. SUMMARY

[0004] The application aims to solve the problems in the prior art and provides an evaporation device for seawater desalination.

[0005] To achieve the above-mentioned purposes, the application provides an evaporation device for seawater desalination, which comprises a device main body, a preheating tank and an evaporation tank are fixedly installed in the inside of the device main body, a first connecting head is fixedly connected to the top of the preheating tank, a second connecting head is fixedly connected to the top of the evaporation tank, a steam pipe and a seawater pipe are fixedly connected between the first connecting head and the second connecting head, a water inlet pipe is fixedly connected to the outer wall of the first connecting head, and the water inlet pipe is fixedly connected to the inside of the device main body. A preheating assembly is arranged for preheating seawater and cooling steam, and the preheating assembly is connected with the preheating tank and the first connecting head. A liquid discharging assembly is arranged for concentrating and discharging seawater after preliminary evaporation, and the liquid discharging assembly is connected with the evaporation tank and the second connecting head.

[0006] In the above technical solution, further, a bent pipe is fixedly connected inside the second connector, the bent pipe is connected to the seawater pipe through the second connector, a water distribution plate is fixedly connected to the end of the bent pipe away from the second connector, a water distribution groove is opened at the bottom of the water distribution plate, the water distribution plate is fixedly installed inside the evaporator, an annular baffle is fixedly installed inside the evaporator, the water distribution plate is set on the top of the annular baffle, and multiple heating elements are arranged in a ring-shaped and equidistant manner between the evaporator and the annular baffle.

[0007] In the above technical solution, the preheating component further includes a connecting pipe and a spiral pipe fixedly connected inside the first connector. The connecting pipe is connected to the water inlet pipe through the first connector, and the spiral pipe is connected to the steam pipe through the first connector. Both the connecting pipe and the spiral pipe are inserted into the interior of the preheating tank. A spiral component is fixedly connected to the end of the spiral pipe away from the first connector. The spiral component is disposed inside the preheating tank. A drain pipe is fixedly connected to the end of the spiral component away from the spiral pipe. The drain pipe is fixedly connected inside the preheating tank.

[0008] In the above technical solution, the draining assembly further includes a motor fixedly connected inside the evaporator. A synchronous belt is tensioned on the outer wall of the output shaft of the motor. A pulley is tensioned inside the synchronous belt. The pulley is rotatably connected inside the evaporator. A screw is fixedly connected to the top of the pulley. A threaded sleeve is threadedly connected to the outer wall of the screw. An evaporation cup is fixedly connected to the outer wall of the threaded sleeve. The evaporation cup is slidably connected inside the annular partition.

[0009] In the above technical solution, the top of the screw sleeve is fixedly connected to a connecting sleeve, the inside of the connecting sleeve is provided with a spiral groove, the inside of the spiral groove is slidably connected to a slider, the top of the slider is fixedly connected to a connecting frame, the slider and the connecting frame are both inserted into the inside of the connecting sleeve, the outer wall of the connecting frame is fixedly connected to a floating ring, and the floating ring is sleeved on the outer wall of the evaporation cup.

[0010] In the above technical solution, further, a connector is slidably connected to the outer wall of the connecting frame, a scraper is fixedly connected to the bottom of the connector, the scraper is rotatably connected to the inside of the evaporation cup, a sealing plate is fixedly connected to the bottom of the scraper, a circular groove is opened inside the sealing plate, a drainage groove is opened at the bottom of the evaporation cup, the sealing plate is set at the top of the drainage groove, a hose is fixedly connected to the bottom of the drainage groove, and the hose is fixedly installed inside the evaporation tank and the annular partition.

[0011] Compared with the prior art, the present invention has the following beneficial effects: By setting up heat exchange components, the heat exchange time and area of ​​steam inside the preheating tank can be guaranteed. Most of the heat of the steam is consumed by the seawater above the preheating tank, allowing the temperature of the seawater inside the preheating tank to rise continuously from low to high. This heats the seawater at the top to a sufficient temperature, avoiding situations where the heat exchange time between seawater and steam is too short, resulting in insufficient heat exchange between the seawater and steam, insufficient cooling of the steam, excessive consumption of subsequent seawater heating and evaporation, and increased pressure on subsequent steam cooling. By setting up a drainage component, the seawater after initial evaporation can be concentrated and further evaporated. After the seawater is concentrated, the concentrated seawater can be automatically discharged from the evaporation cup. At the same time, the evaporation cup and hose that come into contact with the concentrated seawater can be self-cleaned to prevent salt crystals and impurities from adhering to the inner wall of the evaporation cup and hose, which would affect the normal use of the evaporation cup and hose. By setting up a water distribution plate and a water distribution trough, seawater can be diverted to the inner wall of the annular baffle, forming a water curtain that flows down the inner wall of the annular baffle. This allows the heating element to quickly heat the seawater in the water curtain state, improving the heating efficiency of the seawater. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure proposed in this invention; Figure 2 This is a cross-sectional view of the preheating tank structure proposed in this invention; Figure 3 The present invention proposes Figure 2 Enlarged view of the A-section structure; Figure 4 This is a cross-sectional view of the evaporator structure proposed in this invention; Figure 5 The present invention proposes Figure 4 Enlarged view of the structure of section B; Figure 6 The present invention proposes Figure 4 Enlarged view of the C-section structure.

[0013] In the diagram: 1. Main body of the device; 2. Preheating tank; 3. First connector; 4. Evaporator; 5. Second connector; 6. Steam pipe; 7. Seawater pipe; 8. Inlet pipe; 9. Connecting pipe; 10. Spiral pipe; 11. Spiral component; 12. Drain pipe; 13. Bend; 14. Water distribution plate; 15. Water distribution trough; 16. Annular baffle; 17. Heating element; 18. Motor; 19. Synchronous belt; 20. Pulley; 21. Screw; 22. Screw sleeve; 23. Evaporation cup; 24. Connecting sleeve; 25. Spiral groove; 26. Slider; 27. Connecting frame; 28. Floating ring; 29. ​​Connecting component; 30. Scraper; 31. Sealing plate; 32. Circular groove; 33. Drain trough; 34. Hose. Detailed Implementation

[0014] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figures 1 to 6 The illustrated seawater desalination evaporation device includes a main body 1. A preheating tank 2 and an evaporation tank 4 are fixedly installed inside the main body 1. A first connector 3 is fixedly connected to the top of the preheating tank 2, and a second connector 5 is fixedly connected to the top of the evaporation tank 4. Both the first connector 3 and the second connector 5 have multiple connection ports. A steam pipe 6 and a seawater pipe 7 are fixedly connected between the first connector 3 and the second connector 5. A water inlet pipe 8 is fixedly connected to the outer wall of the first connector 3, and the water inlet pipe 8 is fixedly connected inside the main body 1. A bent pipe 13 is fixedly connected inside the second connector 5, and the bent pipe 13 is connected to the seawater pipe 7 through the second connector 5. The bent pipe 13 is located at... A water distribution plate 14 is fixedly connected to one end of the second connector 5. A water distribution groove 15 is opened at the bottom of the water distribution plate 14. The water distribution plate 14 is fixedly installed inside the evaporator 4. An annular baffle 16 is fixedly installed inside the evaporator 4. The water distribution plate 14 is located on top of the annular baffle 16. Multiple heating elements 17 are arranged in a ring at equal intervals between the evaporator 4 and the annular baffle 16. A preheating component is used to preheat the seawater and cool the steam. The preheating component is connected to the preheating tank 2 and the first connector 3. A draining component is used to concentrate and discharge the seawater after preliminary evaporation. The draining component is connected to the evaporator 4 and the second connector 5.

[0016] like Figures 2 to 3 As shown, the preheating assembly includes a connecting pipe 9 and a spiral pipe 10 fixedly connected inside the first connector 3. The connecting pipe 9 is connected to the water inlet pipe 8 through the first connector 3, and the spiral pipe 10 is connected to the steam pipe 6 through the first connector 3. Both the connecting pipe 9 and the spiral pipe 10 are inserted into the preheating tank 2. A spiral component 11 is fixedly connected to the end of the spiral pipe 10 away from the first connector 3. The spiral component 11 is located inside the preheating tank 2. A drain pipe 12 is fixedly connected to the end of the spiral component 11 away from the spiral pipe 10. The drain pipe 12 is fixedly connected to the inside of the preheating tank 2. The preheating component is used to preheat seawater and cool steam to reduce the cost of seawater evaporation and reduce the pressure of subsequent steam cooling. Specifically, after the heating element 17 inside the evaporator 4 heats the seawater to produce steam, the steam is discharged into the first connector 3 through the second connector 5 and the steam pipe 6. The first connector 3 then discharges the steam into the interior of the spiral tube 10, allowing the steam to flow along the interior of the spiral tube 10 and into the interior of the spiral component 11. The steam continues to descend in a spiral shape along the interior of the spiral tube 10 and the spiral component 11, and is finally discharged through the drain pipe 12. During this process, because the diameter of the spiral tube 10 is smaller than that of the steam pipe 6, the steam will accelerate its flow inside the spiral tube 10. This allows the steam to exchange heat with the seawater above the preheating tank 2 through the spiral tube 10, reducing its temperature before it can be quickly discharged into the interior of the spiral component 11. This ensures that the seawater above the preheating tank 2 is always in contact with the high-temperature steam, ensuring that the seawater above the preheating tank 2 is preheated to a sufficient temperature. The steam is discharged into the spiral component 11 through the spiral tube 10. After entering the spiral component 11, since the steam has already undergone one round of heat exchange, and the internal size of the spiral component 11 is larger than that of the spiral tube 10, the cooled steam descends slowly in a spiral shape along the inside of the spiral component 11, and fully exchanges heat with the seawater in the rest of the preheating tank 2 until the steam is cooled into low-temperature fresh water and discharged through the drain pipe 12. This ensures that the steam has sufficient heat exchange time and heat exchange area inside the preheating tank 2, allowing most of the heat of the steam to be consumed by the seawater above the preheating tank 2, causing the temperature of the seawater inside the preheating tank 2 to rise continuously from low to high. This heats the seawater at the top, which is to be discharged into the second connector 5 through the first connector 3 and the seawater pipe 7, to a sufficient temperature, avoiding a situation where the heat exchange time between the seawater and the steam is too short, resulting in insufficient heat exchange between the seawater and the steam, insufficient cooling of the steam, excessive consumption of subsequent seawater heating and evaporation, and increased pressure for subsequent steam cooling.

[0017] like Figure 4 and Figure 6As shown, the drainage assembly includes a motor 18 fixedly connected inside the evaporator 4. A synchronous belt 19 is tensioned on the outer wall of the output shaft of the motor 18. A pulley 20 is tensioned inside the synchronous belt 19. The pulley 20 is rotatably connected inside the evaporator 4. A screw 21 is fixedly connected to the top of the pulley 20. A threaded sleeve 22 is threadedly connected to the outer wall of the screw 21. An evaporation cup 23 is fixedly connected to the outer wall of the threaded sleeve 22. The evaporation cup 23 is slidably connected inside the annular baffle 16. A connecting sleeve 24 is fixedly connected to the top of the threaded sleeve 22. By installing a high-temperature pressure sensor inside the connecting sleeve 24, the sensor can be triggered when the slider 26 slides to the end of the spiral groove 25. This triggers the motor 18, causing it to rotate forward and backward according to a program. The motor 18 then drives the screw sleeve 22 to move up and down through the synchronous belt 19, pulley 20, and screw 21. This causes the screw sleeve 22 to move the evaporation cup 23 up and down. After the evaporation cup 23 descends, seawater between the annular baffle 16 and the evaporation cup 23 is drained from the top of the evaporation cup 23. After the evaporation cup 23 rises, no more seawater enters, allowing the evaporation cup 23 to begin further evaporation and concentration of the seawater inside. The connecting sleeve 24 has a spiral groove 25 inside, with a slider 26 slidably connected inside. A connecting frame 27 is fixedly connected to the top of the slider 26. Both the slider 26 and the connecting frame 27 are inserted into the connecting sleeve 24. A floating ring 28 is fixedly connected to the outer wall of the connecting frame 27 and is fitted onto the evaporation cup 23. The outer wall of the evaporating cup 23 is slidably connected to the outer wall of the connecting frame 27. The bottom of the connecting frame 27 is fixedly connected to the scraper 30. The scraper 30 is rotatably connected to the inside of the evaporating cup 23. The bottom of the scraper 30 is fixedly connected to the sealing plate 31. The sealing plate 31 has a circular groove 32 inside. The bottom of the evaporating cup 23 has a drain groove 33. The sealing plate 31 is set at the top of the drain groove 33. The bottom of the drain groove 33 is fixedly connected to the hose 34. The hose 34 is fixedly installed inside the evaporating tank 4 and the annular partition 16. The drainage component is used to evaporate and concentrate the seawater after initial evaporation and then discharge the concentrated seawater. Specifically, after the seawater is initially evaporated by the heating element 17, it slides down the annular baffle 16 into the space between the annular baffle 16 and the evaporation cup 23 for storage and gradual evaporation. As the amount of seawater stored here gradually increases, the seawater begins to push the floating ring 28 upward along the outer wall of the evaporation cup 23. This causes the floating ring 28 to drive the slider 26 through the connecting frame 27 to slide along the spiral groove 25 inside the connecting sleeve 24 until the slider 26 reaches the end of the spiral groove 25 and triggers the high-temperature pressure sensor, at which point it stops. During this process, the slider 26 drives the floating ring 28 to rise spirally along the inside of the spiral groove 25 through the connecting frame 27. This causes the connecting frame 27 to drive the scraper 30 to rotate inside the evaporation cup 23 through the connecting member 29, thereby causing the scraper... Scraping component 30 scrapes away salt crystals and other impurities adhering to the inner wall of evaporating cup 23, causing the scraper 30 to rotate along with the sealing plate 31. When the sealing plate 31 rotates the circular groove 32 past the drain groove 33, the evaporating cup 23 is temporarily connected to the hose 34. The concentrated seawater inside the evaporating cup 23 carries the scraped-off salt crystals and impurities out through the hose 34. After the sealing plate 31 rotates the circular groove 32 past the drain groove 33, the sealing plate 31 re-seals the evaporating cup 23, achieving the effect of scraping away salt crystals and impurities inside the evaporating cup 23 and discharging them with the concentrated seawater. This prevents excessive salt crystals and impurities from adhering inside the evaporating cup 23, which could affect normal operation. Meanwhile, when the high-temperature pressure sensor inside the connecting sleeve 24 is triggered, it controls motor 1... 8. The installation procedure performs one forward and reverse rotation, causing motor 18 to drive screw sleeve 22 to reciprocate up and down once via synchronous belt 19, pulley 20, and screw 21. This, in turn, causes screw sleeve 22 to drive evaporator cup 23 to reciprocate up and down once. When evaporator cup 23 descends, seawater accumulated between annular baffle 16 and evaporator cup 23 is discharged into the interior of evaporator cup 23, transferring the accumulated seawater to the interior of evaporator cup 23. When evaporator cup 23 rises, it resets. At this time, there is not enough seawater between annular baffle 16 and evaporator cup 23, causing float ring 28 to lose buoyancy and descend to reset. This causes float ring 28 to drive slider 26 to rotate along the interior of spiral groove 25 via connecting frame 27, resetting and stopping the high-temperature pressure. The force sensor triggers the connecting frame 27, which in turn drives the scraper 30 to rotate and reset via the connector 29. The scraper 30 then drives the sealing plate 31 to rotate and reset. During this process, the circular groove 32 on the sealing plate 31 will overlap with the drainage groove 33 again, allowing the evaporation cup 23 and the hose 34 to reconnect. Due to the fast reset speed, only a portion of the seawater that entered the evaporation cup 23 is discharged into the hose 34. This portion of seawater will flush the inner wall of the hose 34. When the evaporation cup 23 moves up and down and causes the hose 34 to deform, the salt crystals and other impurities that detach from the inner wall of the hose 34 are washed away, preventing excessive salt crystals and impurities from adhering to the inside of the hose 34 and affecting the discharge of concentrated seawater. This achieves the effect of self-cleaning the inner wall of the hose 34.

[0018] Working principle: When the evaporator is working, the inlet pipe 8 discharges seawater into the connecting pipe 9 through the first connector 3, allowing the seawater to flow into the bottom of the inner wall of the preheating tank 2. The seawater at the top of the inner wall of the preheating tank 2 is then discharged into the seawater pipe 7 through the first connector 3. The seawater pipe 7 then discharges into the bent pipe 13 through the second connector 5. The bent pipe 13 then distributes the seawater through the water distribution plate 14 and the water distribution trough 15 to the inner wall of the annular baffle 16, forming a water curtain flowing down the inner wall of the annular baffle 16. At this time, the heating element 17 heats the water curtain formed by the seawater through the annular baffle 16, causing the water curtain to initially evaporate, and the evaporated steam is then passed through... The seawater is discharged into the spiral tube 10 through the second connector 5, the steam pipe 6, and the first connector 3. The spiral tube 10, in conjunction with the spiral component 11, preheats the seawater inside the preheating tank 2 and cools the steam. The seawater that has been initially evaporated flows down between the annular baffle 16 and the evaporation cup 23. Once enough seawater has accumulated to push the floating ring 28 upward, the drainage component works to discharge the concentrated seawater inside the evaporation cup 23 and collect the seawater accumulated between the annular baffle 16 and the evaporation cup 23 for further evaporation and concentration. At this point, no new seawater enters the evaporation cup 23 through the drainage component, and the seawater inside the evaporation cup 23 continues to evaporate and concentrate.

[0019] 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 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 claimed invention.

Claims

1. An evaporation device for seawater desalination, comprising a main body (1), characterized in that, The preheating tank (2) and the evaporating tank (4) are fixedly installed inside the main body (1) of the device. A first connector (3) is fixedly connected to the top of the preheating tank (2), and a second connector (5) is fixedly connected to the top of the evaporating tank (4). A steam pipe (6) and a seawater pipe (7) are fixedly connected between the first connector (3) and the second connector (5). A water inlet pipe (8) is fixedly connected to the outer wall of the first connector (3), and the water inlet pipe (8) is fixedly connected inside the main body (1) of the device. A preheating assembly for preheating seawater and cooling steam, the preheating assembly being connected to the preheating tank (2) and the first connector (3); The drainage assembly is used to concentrate and discharge the seawater after preliminary evaporation. The drainage assembly is connected to the evaporator (4) and the second connector (5).

2. The evaporation device for seawater desalination according to claim 1, characterized in that, The second connector (5) is fixedly connected to a bend (13), which is connected to the seawater pipe (7) through the second connector (5). The end of the bend (13) away from the second connector (5) is fixedly connected to a water distribution plate (14). A water distribution groove (15) is opened at the bottom of the water distribution plate (14). The water distribution plate (14) is fixedly installed inside the evaporator (4). An annular baffle (16) is fixedly installed inside the evaporator (4). The water distribution plate (14) is located on the top of the annular baffle (16). Multiple heating elements (17) are arranged in a ring-shaped and equidistant manner between the evaporator (4) and the annular baffle (16).

3. The evaporation device for seawater desalination according to claim 1, characterized in that, The preheating assembly includes a connecting pipe (9) and a spiral pipe (10) fixedly connected inside the first connector (3). The connecting pipe (9) is connected to the water inlet pipe (8) through the first connector (3), and the spiral pipe (10) is connected to the steam pipe (6) through the first connector (3). Both the connecting pipe (9) and the spiral pipe (10) are inserted into the preheating tank (2). A spiral component (11) is fixedly connected to the end of the spiral pipe (10) away from the first connector (3). The spiral component (11) is located inside the preheating tank (2). A drain pipe (12) is fixedly connected to the end of the spiral component (11) away from the spiral pipe (10). The drain pipe (12) is fixedly connected inside the preheating tank (2).

4. An evaporation device for seawater desalination according to claim 2, characterized in that, The drain assembly includes a motor (18) fixedly connected inside the evaporator (4). A synchronous belt (19) is tensioned on the outer wall of the output shaft of the motor (18). A pulley (20) is tensioned inside the synchronous belt (19). The pulley (20) is rotatably connected inside the evaporator (4). A screw (21) is fixedly connected to the top of the pulley (20). A threaded sleeve (22) is threadedly connected to the outer wall of the screw (21). An evaporation cup (23) is fixedly connected to the outer wall of the threaded sleeve (22). The evaporation cup (23) is slidably connected inside the annular partition (16).

5. An evaporation device for seawater desalination according to claim 4, characterized in that, The top of the screw sleeve (22) is fixedly connected to a connecting sleeve (24). The connecting sleeve (24) has a spiral groove (25) inside. A slider (26) is slidably connected inside the spiral groove (25). A connecting frame (27) is fixedly connected to the top of the slider (26). The slider (26) and the connecting frame (27) are both inserted into the inside of the connecting sleeve (24). A floating ring (28) is fixedly connected to the outer wall of the connecting frame (27). The floating ring (28) is sleeved on the outer wall of the evaporation cup (23).

6. An evaporation device for seawater desalination according to claim 5, characterized in that, The outer wall of the connecting frame (27) is slidably connected to a connector (29), and a scraper (30) is fixedly connected to the bottom of the connector (29). The scraper (30) is rotatably connected to the inside of the evaporating cup (23). A sealing plate (31) is fixedly connected to the bottom of the scraper (30). A circular groove (32) is opened inside the sealing plate (31). A drain groove (33) is opened at the bottom of the evaporating cup (23). The sealing plate (31) is set at the top of the drain groove (33). A hose (34) is fixedly connected to the bottom of the drain groove (33). The hose (34) is fixedly installed inside the evaporating tank (4) and the annular partition (16).

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