Double-effect concentration device and use method thereof

Abstract

The invention discloses a double-effect concentration device and a use method thereof, and relates to the technical field of double-effect concentration equipment, the double-effect concentration device comprises a first concentration tank, a second concentration tank, a first condenser and a second condenser; the first concentration tank, the second concentration tank, the first condenser and the second condenser are sequentially arranged and communicated through pipelines, cleaning assemblies are arranged in the first concentration tank, the second concentration tank, the first condenser and the second condenser, a first communicating pipe is fixedly arranged between the first concentration tank and the second concentration tank, and a material conveying pump is fixedly arranged on the first communicating pipe. The first concentration tank is communicated with a breather pipe, the side edge of the second condenser is connected with a gas-liquid separator through a pipeline, the side edges of the first concentration tank and the first condenser are provided with U-shaped return pipes, and the upper end and the lower end of each of the first condenser and the second condenser are provided with breather pipes; the breather pipe is fixedly connected with the U-shaped return pipe, so that the problem that residues on the inner wall of the concentration tank cannot be cleaned thoroughly in the prior art, and the next use is easily influenced is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of double-effect concentration equipment, and specifically relates to a double-effect concentration device and a using method thereof. Background Art

[0002] The double-effect concentration device is a highly energy-efficient equipment for solution concentration, commonly used in fields such as chemical industry, food, pharmaceuticals, and environmental protection. Its core principle is to recycle heat energy through two evaporation (double-effect) processes, significantly reducing energy consumption. In existing double-effect concentration equipment, due to the tight connection of pipelines, the cleaning of its inner wall is rather cumbersome;

[0003] The Chinese invention with the authorization announcement number CN113842653B proposes a circulating vacuum decompression double-effect concentrator: including a concentration tank, a first condenser, a gas-liquid separator, a second condenser, a cooler, a liquid receiving bucket, a high-temperature steam rack, a filter rack, a drain pipe, and a collection pipe. The collection pipe includes a П-shaped pipe, a branch pipe, a moving ring, a magnetic attraction plate, an electric telescopic rod, a magnetic stone ring, a gear ring, a water spraying pipe, and a rotating cleaning ball. The inner wall of the concentrator is cleaned through the collection pipe, and the water sprayed by multiple rotating cleaning balls can completely contact the inner wall of the concentrator to ensure that the inner wall of the concentrator is completely cleaned. The water required for cleaning is generated by the concentrator to achieve the recycling of water, reduce water waste, and at the same time, the filter rack is used to prevent substances in the original liquid from entering the connected pipelines, thereby polluting the pipelines.

[0004] However, there are still deficiencies in the existing technology:

[0005] The above settings drive the magnetic stone ring to move upward to contact the moving ring and the gear ring by starting the electric telescopic rod. The water spraying pipe is arranged in the moving ring and is pushed upward at the bottom of the water spraying pipe, which easily causes the movement trajectory of the water spraying pipe to be unstable, and only cleaning the residues on the inner wall of the concentration tank by flushing is not thorough, which easily affects the next use. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention provides a double-effect concentration device and a using method thereof to solve the problems in the prior art that pushing the water spraying pipe upward at the bottom of the water spraying pipe easily causes the movement trajectory of the water spraying pipe to be unstable, and only cleaning the residues on the inner wall of the concentration tank by flushing is not thorough, which easily affects the next use.

[0007] To achieve the above object, the present invention provides a double-effect concentration device and its use method, including a first concentration tank, a second concentration tank, a first condenser, and a second condenser; the first concentration tank, the second concentration tank, the first condenser, and the second condenser are arranged in sequence and connected by pipelines, and cleaning components are provided inside all of them. A first connecting pipe is fixedly arranged between the first concentration tank and the second concentration tank, and a feed pump is fixedly arranged on the first connecting pipe. A ventilation pipe is connected to the first concentration tank. A gas-liquid separator is connected to the side of the second condenser through a pipeline. A U-shaped return pipe is arranged on the sides of the first concentration tank and the first condenser. Ventilation pipes are arranged at the upper and lower ends of the first condenser and the second condenser, and are fixedly connected to the U-shaped return pipe through the ventilation pipes. A booster pump is arranged at a part of the lower end of the U-shaped return pipe close to the first connecting pipe.

[0008] As a further solution of the present invention: Feed pipes and discharge pipes are fixedly arranged on the sides of the first concentration tank and the second concentration tank.

[0009] As a further solution of the present invention: A fourth connecting pipe is fixedly connected between the first concentration tank and the first condenser, a fifth connecting pipe is fixedly arranged between the first condenser and the second condenser, a pipeline on the second concentration tank is connected to the fifth connecting pipe, a second connecting pipe is fixedly arranged between the second condenser and the gas-liquid separator, a liquid storage barrel is arranged on the side of the gas-liquid separator, a cooling pipe is fixedly arranged on the liquid storage barrel, a third connecting pipe is fixedly arranged between the cooling pipe and the gas-liquid separator, and a vacuum machine is fixedly arranged at the end of the third connecting pipe.

[0010] As a further solution of the present invention: A heater is fixedly installed on the fifth connecting pipe.

[0011] As a further solution of the present invention: First branch pipes are fixedly arranged between both sides of the first connecting pipe and the U-shaped return pipe, electric valves are arranged on the first branch pipes, and a second L-shaped pipe is arranged between the gas-liquid separator and the U-shaped return pipe.

[0012] As a further solution of the present invention: The upper end of the U-shaped return pipe is closed, and a through port is arranged at the lower end.

[0013] As a further solution of the present invention: The cleaning component includes a positioning sleeve, a flushing pipe, a rotary cleaning ball, and a scraping component; the flushing pipe is slidably arranged in the positioning sleeve, a pair of electric push rods are symmetrically and fixedly arranged in the positioning sleeve, the output shafts of the electric push rods are fixedly connected with magnetic ring, a pair of magnetic attraction plates are fixedly arranged on the side of the flushing pipe close to the bottom, a limiting sliding ring is fixedly arranged at the bottom of the flushing pipe, and a plurality of rotary cleaning balls are equidistantly arranged on the positioning sleeve.

[0014] As a further solution of the present invention: a snap ring is fixedly arranged at the upper end of the flushing pipe, and a scraping component is fixedly arranged on one side of the flushing pipe close to the snap ring; mounting rings are fixedly arranged in the first concentration tank, the second concentration tank, the first condenser and the second condenser, a filter plate is clamped in the mounting ring, and a clamping seat is fixedly arranged below the filter plate, and the inner diameter of the clamping seat is the same as the outer diameter of the snap ring.

[0015] As a further solution of the present invention: the scraping component includes a positioning ring, a first scraping plate, a second scraping plate and a connecting rod; the positioning ring is fixedly connected with the flushing pipe, the positioning ring is fixedly connected with the first scraping plate, the first scraping plate abuts against the inner side wall of the first condenser, the first scraping plate and the second scraping plate are fixedly connected through the connecting rod, and the second scraping plate also abuts against the inner side wall of the first condenser.

[0016] The usage method for the above double-effect concentration device includes the following steps;

[0017] Step 1: Inject the liquid to be concentrated into the first concentration tank, and introduce high-temperature steam through the ventilation pipe;

[0018] Step 2: The secondary steam generated by the first-effect concentration is heated by the heater and then input into the second concentration tank for secondary concentration, and the original liquid is discharged after the secondary concentration is completed;

[0019] Step 3: Start the cleaning component, start the electric push rod, push the magnet ring to move upward in the positioning sleeve, drive the flushing pipe to move upward to engage the snap ring with the clamping seat through the magnetic attraction between the magnet ring and the magnetic attraction plate, and at the same time drive the scraping component to achieve preliminary cleaning;

[0020] Step 4: Open the electric valve, start the booster pump, and use the pressurized condensed water to rotate and spray the inner walls of the first concentration tank, the second concentration tank, the first condenser and the second condenser.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By setting up a cleaning component; after the secondary concentration of the stock solution, the stock solution is discharged, and the recycling of condensed water is utilized. In cooperation with starting the cleaning component and the through port, the magnet ring is pushed to move upward in the positioning sleeve. Through the magnetic attraction between the magnet ring and the magnetic attraction plate, the flushing pipe is driven to move upward until the snap ring is engaged with the snap seat; the steam after secondary concentration is liquefied by the second condenser. After the gas-liquid separator separates the gas and liquid, part of the condensed water is recycled to the U-shaped return pipe through the ventilation pipe and the second L-shaped pipe, and part flows into the liquid storage tank again through the third communication pipe for further cooling. The electric valve is opened, and the booster pump is started. The pressurized condensed water is used to rotate and spray the inner walls of the first concentration tank, the second concentration tank, the first condenser, and the second condenser. When less condensed water is recycled, the cleaning liquid can also be injected through the through port, and the cleaning component is used to clean the device. The cleaning component includes a scraping component, which scrapes the adhesion on the inner side wall of the device before flushing the inner side wall, enhancing the cleaning effect.

[0023] 2. All the multiple pipes in the device are fixedly connected through quick-installation flanges, which facilitates the overall installation, disassembly, and cleaning of the device. Brief Description of the Drawings

[0024] Figure 1 is a three-dimensional structure diagram of the present invention;

[0025] Figure 2 is a cross-sectional view of the first condenser of the present invention;

[0026] Figure 3 of the present invention Figure 2 is a schematic structural diagram of the state where the flushing pipe extends out;

[0027] Figure 4 is a cross-sectional structural diagram of the flushing pipe and the positioning sleeve of the present invention;

[0028] Figure 5 of the present invention Figure 1 is an enlarged view of part A;

[0029] Figure 6 of the present invention Figure 1 is an enlarged view of part B;

[0030] Figure 7 of the present invention Figure 3 is an enlarged view of part C;

[0031] Figure 8 of the present invention Figure 4 is an enlarged view of part D.

[0032] In the figure: 1. First concentration tank; 2. Second concentration tank; 3. First condenser; 4. Second condenser; 5. Gas-liquid separator; 6. Liquid storage bucket; 7. First support; 8. Second support; 9. U-shaped return pipe; 10. Feed pipe; 11. First connecting pipe; 12. Feed pump; 13. Vent pipe; 14. Second L-shaped pipe; 15. Second connecting pipe; 16. Third connecting pipe; 17. Cooling pipe; 18. Vacuum machine; 19. Booster pump; 20. Electric push rod; 21. First branch pipe; 22. Electric valve; 23. Positioning sleeve; 24. Installation ring; 25. Filter plate; 26. Scraping assembly; 27. Positioning ring; 28. First scraper; 29. Second scraper; 30. Link; 31. Clamping seat; 32. Snap ring; 33. Through port; 34. Magnet ring; 35. Block; 36. Protrusion; 37. Magnetic attraction plate; 38. Limit sliding ring; 39. Flushing pipe; 40. Rotary cleaning ball; 41. Heater; 42. Fifth connecting pipe; 43. Quick installation flange; 44. Fourth connecting pipe. Detailed implementation mode

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1-8 shown, a double-effect concentration device and its use method include a first concentration tank 1, a second concentration tank 2, a first condenser 3, and a second condenser 4; the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4 are arranged in sequence. A first connecting pipe 11 is fixedly arranged between the first concentration tank 1 and the second concentration tank 2. The first concentration tank 1 and the second concentration tank 2 are used to store the stock solution to be concentrated; the first concentration tank 1 and the second concentration tank 2 are connected through the first connecting pipe 11; a feed pump 12 is fixedly arranged on the first connecting pipe 11 to perform the first-effect concentration on the stock solution in the first concentration tank 1; after the concentration of the stock solution in the first concentration tank 1 is completed, the stock solution in the first concentration tank 1 is pumped into the second concentration tank 2 through the feed pump 12; the second-effect concentration is performed in the second concentration tank 2; a feed pipe 10 is fixedly arranged on the sides of the first concentration tank 1 and the second concentration tank 2 for adding the stock solution; a discharge pipe is arranged on the sides of the first concentration tank 1 and the second concentration tank 2.

[0035] As an implementation mode in this embodiment, a ventilation pipe 13 is connected to the first concentration tank 1, and steam is injected through the ventilation pipe 13; a fourth communication pipe 44 is fixedly connected between the first concentration tank 1 and the first condenser 3, and a fifth communication pipe 42 is fixedly arranged between the first condenser 3 and the second condenser 4. A pipe on the second concentration tank 2 is communicated with the fifth communication pipe 42. A gas-liquid separator 5 is arranged on the side of the second condenser 4. A second communication pipe 15 is fixedly arranged between the second condenser 4 and the gas-liquid separator 5. A liquid storage bucket 6 is arranged on the side of the gas-liquid separator 5. A cooling pipe 17 is fixedly arranged on the liquid storage bucket 6. A third communication pipe 16 is fixedly arranged between the cooling pipe 17 and the gas-liquid separator 5. A vacuum machine 18 is fixedly arranged at the end of the third communication pipe 16. The hot steam passing through the ventilation pipe 13 heats the stock solution in the first concentration tank 1 to accelerate the evaporation and concentration rate of the stock solution; the steam enters the second concentration tank 2 through the fourth communication pipe 44 and the fifth communication pipe 42 to heat the stock solution in the second concentration tank 2. Since the temperature of the steam drops after heating the stock solution in the first concentration tank 1, in order to ensure the evaporation rate in the second concentration tank 2, a heater 41 is fixedly installed on the fifth communication pipe 42 to heat the steam entering the fifth communication pipe 42; the steam after heating the stock solution in the first concentration tank 1 and the second concentration tank 2 and the steam evaporated from the stock solution are collected in the liquid storage bucket 6 together through the second communication pipe 15, the gas-liquid separator 5, and the third communication pipe 16; by setting the vacuum machine 18, the device is kept in a vacuum environment. After the steam passes through the gas-liquid separator 5, the vacuum machine 18 assists in removing the non-condensable gas to maintain the low-pressure state inside the first condenser 3 and the second condenser 4, ensuring that the steam is quickly condensed into a liquid and smoothly flows into the liquid receiving bucket, the liquid storage bucket 6; by maintaining the low pressure of the system through the vacuum machine 18, the boiling point of the second effect is further reduced, and the stock solution evaporates at a lower temperature to protect the heat-sensitive components;

[0036] As an implementation method in this embodiment, a U-shaped reflux pipe 9 is arranged on the sides of the first concentration tank 1 and the first condenser 3. Vent pipes 13 are arranged at the upper and lower ends of the first condenser 3 and the second condenser 4, and are fixedly connected to the U-shaped reflux pipe 9 through the vent pipes 13. First branch pipes 21 are fixedly arranged between both sides of the first connecting pipe 11 and the U-shaped reflux pipe 9. Electric valves 22 are arranged on the first branch pipes 21. A second L-shaped pipe 14 is arranged between the gas-liquid separator 5 and the U-shaped reflux pipe 9 and is communicated with the U-shaped reflux pipe 9 through the second L-shaped pipe 14. A booster pump 19 is arranged at a part of the lower end of the U-shaped reflux pipe 9 close to the first connecting pipe 11. The upper end of the U-shaped reflux pipe 9 is closed, and a through port 33 is arranged at the lower end. During use, the through port 33 can be closed, or after injecting a cleaning liquid through the through port 33 and then closing it, the electric valve 22 is opened, and pressurized by the booster pump 19, the condensed water or the cleaning liquid is injected into the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4 to clean the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4;

[0037] As an implementation mode in this embodiment, a cleaning component is provided in the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4. The cleaning component includes a positioning sleeve 23, a flushing water pipe 39, a rotating cleaning ball 40, and a scraping component 26. The flushing water pipe 39 is slidably arranged in the positioning sleeve 23. A pair of electric push rods 20 are symmetrically and fixedly arranged in the positioning sleeve 23. The output shaft of the electric push rod 20 is fixedly connected with a magnet ring 34. A pair of magnetic attraction plates 37 are fixedly arranged on the side of the flushing water pipe 39 near the bottom. A limiting sliding ring 38 is fixedly arranged at the bottom of the flushing water pipe 39. The limiting sliding ring 38 is used to realize the sealing between the flushing water pipe 39 and the positioning sleeve 23. A plurality of rotating cleaning balls 40 are equidistantly arranged on the positioning sleeve 23. The rotating cleaning balls 40 rotate during the process of the flushing water pipe 39 spraying water, increasing the uniformity of the sprayed condensed water. A clamping ring 32 is fixedly arranged at the upper end of the flushing water pipe 39. A scraping component 26 is fixedly arranged on one side of the flushing water pipe 39 close to the clamping ring 32. Installation rings 24 are fixedly arranged in the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4. A filter plate 25 is clamped in the installation ring 24. A pressure hatch is arranged in the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4. The installation of the filter plate 25 is conveniently realized by opening and closing the pressure hatch. A clamping seat 31 is fixedly arranged below the filter plate 25. The inner diameter of the clamping seat 31 is the same as the outer diameter of the clamping ring 32. When the electric push rod 20 is started, the magnet ring 34 is pushed to move upward in the positioning sleeve 23. Through the magnetic attraction force between the magnet ring 34 and the magnetic attraction plates 37, the flushing water pipe 39 is driven to move upward until the clamping ring 32 is engaged with the clamping seat 31, that is, the upper end of the flushing water pipe 39 is closed, facilitating the spraying of condensed water from the side of the flushing water pipe 39. The scraping component 26 includes a positioning ring 27, a first scraping plate 28, a second scraping plate 29, and a connecting rod 30. The positioning ring 27 is fixedly connected with the flushing water pipe 39. The positioning ring 27 is fixedly connected with the first scraping plate 28. The first scraping plate 28 abuts against the inner wall of the first condenser 3. The first scraping plate 28 and the second scraping plate 29 are fixedly connected by a connecting rod 30. The second scraping plate 29 also abuts against the inner wall of the first condenser 3. In specific implementation, one layer of the first scraping plate 28 can be arranged according to needs, or a multi-layer structure similar to the first scraping plate 28 and the second scraping plate 29. When the flushing water pipe 39 rises, the first scraping plate 28 and the second scraping plate 29 are pushed to slide along the inner wall of the first condenser 3, preliminarily cleaning the inner wall of the first condenser 3. The difference between the first concentration tank 1, the second concentration tank 2 and the first condenser 3, the second condenser 4 is that the evaporation of the original liquid needs to be carried out in the first concentration tank 1 and the second concentration tank 2. Therefore, the positioning sleeve 23 in the cleaning component is arranged on the lower side of the first concentration tank 1 and the second concentration tank 2.When the device is working, part of the cooling water enters the U-shaped return pipe 9 through the ventilation pipe 13 and the second L-shaped pipe 14. After the evaporation and concentration are completed, the original liquid in the second concentration tank 2 is discharged. Subsequently, the electric valve 22 is opened, and the booster pump 19 is started to inject the condensed water in the U-shaped return pipe 9 into the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4, and the cleaning of the inner side walls of the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4 is realized by spraying through the rotating cleaning ball 40; in order to increase the stability of the movement of the flushing pipe 39, a stopper 35 is fixedly arranged in the mounting ring 24, and several convex blocks 36 are arranged at the upper end of the magnet ring 34. The electric push rod 20 is started until the convex block 36 abuts against the stopper 35 to realize the clamping of the clamping ring 32 and the clamping seat 31; second brackets 8 are fixedly arranged below both the gas-liquid separator 5 and the liquid storage barrel 6, and first brackets 7 are fixedly arranged below the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4; all the pipelines of the device are fixedly connected through quick-installation flanges 43, which is convenient for disassembling and cleaning the pipelines;

[0038] The usage method of the upper double-effect concentration device includes the following steps:

[0039] Step 1: Inject the liquid to be concentrated into the first concentration tank 1, and introduce high-temperature steam through the ventilation pipe 13;

[0040] Step 2: The secondary steam generated by the first-effect concentration is heated by the heater 41 and then input into the second concentration tank 2 for secondary concentration. After the secondary concentration is completed, the original liquid is discharged;

[0041] Step 3: Start the cleaning assembly, start the electric push rod 20, push the magnet ring 34 to move upward in the positioning sleeve 23, and drive the flushing pipe 39 to move upward until the clamping ring 32 and the clamping seat 31 are clamped through the magnetic attraction between the magnet ring 34 and the magnetic attraction plate 37, and at the same time drive the scraping assembly 26 to realize preliminary cleaning;

[0042] Step 4: The steam after secondary concentration is liquefied by the second condenser 4. After the gas-liquid separation by the gas-liquid separator 5, part of the condensed water is recovered to the U-shaped return pipe 9 through the ventilation pipe 13 and the second L-shaped pipe 14, and part of it is cooled again through the third connecting pipe 16 and flows into the liquid storage barrel 6. The electric valve 22 is opened, and the booster pump 19 is started to use the pressurized condensed water to perform rotary spraying on the inner walls of the first concentration tank 1, the second concentration tank 2, the first condenser 3, and the second condenser 4.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] The above has described in detail one embodiment of the present invention, but the described content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A double-effect concentrator, characterized in that: The invention comprises a first concentrating tank (1), a second concentrating tank (2), a first condenser (3), and a second condenser (4); the first concentrating tank (1), the second concentrating tank (2), the first condenser (3), and the second condenser (4) are arranged in sequence and connected through a pipeline, and a cleaning component is arranged inside each of the first concentrating tank (1) and the second concentrating tank (2); a first connecting pipe (11) is fixedly arranged between the first concentrating tank (1) and the second concentrating tank (2); a feed pump (12) is fixedly arranged on the first connecting pipe (11); A vent pipe (13) is provided, a gas-liquid separator (5) is provided on the side of the second condenser (4) through a pipeline connection, a U-shaped reflux pipe (9) is provided on the side of the first concentrator (1) and the first condenser (3), the first condenser (3) and the second condenser (4) are provided with vent pipes (13) at the upper and lower ends, and are fixedly connected to the U-shaped reflux pipe (9) through the vent pipe (13), and a booster pump (19) is provided at the lower end of the U-shaped reflux pipe (9) close to the first connecting pipe (11).

2. A double-effect concentrator according to claim 1, characterized in that: A feed pipe (10) and a discharge pipe are fixedly arranged on the sides of the first concentration tank (1) and the second concentration tank (2).

3. A double-effect concentrator according to claim 1, characterized in that: A fourth connecting pipe (44) is fixedly connected between the first concentrating tank (1) and the first condenser (3), a fifth connecting pipe (42) is fixedly arranged between the first condenser (3) and the second condenser (4), a pipeline is arranged on the second concentrating tank (2) and is connected to the fifth connecting pipe (42), a second connecting pipe (15) is fixedly arranged between the second condenser (4) and the gas-liquid separator (5), a liquid storage barrel (6) is arranged on the side of the gas-liquid separator (5), a cooling pipe (17) is fixedly arranged on the liquid storage barrel (6), a third connecting pipe (16) is fixedly arranged between the cooling pipe (17) and the gas-liquid separator (5), and a vacuum machine (18) is fixedly arranged at the end of the third connecting pipe (16).

4. A double-effect concentrator according to claim 3, characterized in that: A heater (41) is fixedly mounted on the fifth connecting pipe (42).

5. A double-effect concentrator according to claim 1, characterized in that: A first branch pipe (21) is fixedly arranged between the two sides of the first connecting pipe (11) and the U-shaped return pipe (9), an electric valve (22) is arranged on the first branch pipe (21), and a second L-shaped pipe (14) is arranged between the gas-liquid separator (5) and the U-shaped return pipe (9).

6. A double-effect concentrator according to claim 1, characterized in that: The upper end of the U-shaped reflux pipe (9) is closed, and the lower end is provided with a through opening (33).

7. A double-effect concentrator according to claim 1, characterized in that: The cleaning assembly comprises a positioning sleeve (23), a flushing pipe (39), a rotating cleaning ball (40), and a scraping assembly (26); the flushing pipe (39) is slidably arranged in the positioning sleeve (23); a pair of electric push rods (20) are symmetrically fixedly arranged in the positioning sleeve (23); the output shafts of the electric push rods (20) are fixedly connected to a magnet ring (34); a pair of magnetic suction plates (37) are fixedly arranged on the side of the flushing pipe (39) near the bottom; a limiting slip ring (38) is fixedly arranged at the bottom of the flushing pipe (39); and a plurality of rotating cleaning balls (40) are equidistantly arranged on the positioning sleeve (23).

8. A double-effect concentrator according to claim 7, characterized in that: A clamping ring (32) is fixedly provided at the upper end of the flushing pipe (39), and a scraping assembly (26) is fixedly provided on one side of the flushing pipe (39) close to the clamping ring (32); a mounting ring (24) is fixedly provided inside the first concentrating tank (1), the second concentrating tank (2), the first condenser (3), and the second condenser (4), a filter plate (25) is clamped inside the mounting ring (24), and a clamping seat (31) is fixedly provided below the filter plate (25), and the inner diameter of the clamping seat (31) is the same as the outer diameter of the clamping ring (32).

9. A double-effect concentrator according to claim 8, characterized in that: The scraping assembly (26) includes a positioning ring (27), a first scraper (28), a second scraper (29), and a connecting rod (30); the positioning ring (27) is fixedly connected to the flushing pipe (39), the positioning ring (27) is fixedly connected to the first scraper (28), the first scraper (28) abuts against the inner wall of the first condenser (3), the first scraper (28) and the second scraper (29) are fixedly connected via the connecting rod (30), and the second scraper (29) also abuts against the inner wall of the first condenser (3).

10. A method for using a double-effect concentrator according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: injecting the liquid to be concentrated into the first concentration tank (1), and introducing high-temperature steam through the ventilation pipe (13); Step 2: The secondary steam generated by the first effect concentration is heated by the heater (41) and then input into the second concentration tank (2) for secondary concentration, and the original liquid is discharged after the secondary concentration is completed; Step 3: Start the cleaning component, start the electric push rod (20), push the magnetic ring (34) to move upward in the positioning sleeve (23), and drive the flushing pipe (39) to move upward until the clamping ring (32) and the clamping seat (31) are engaged through the magnetic attraction of the magnetic ring (34) and the magnetic attraction plate (37), and at the same time drive the scraping component (26) to achieve preliminary cleaning; Step 4: Open the electric valve (22), start the booster pump (19), and use the pressurized condensed water to perform rotational spray cleaning on the inner walls of the first concentration tank (1), the second concentration tank (2), the first condenser (3), and the second condenser (4).

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