High-salinity wastewater mvr evaporation crystallization device

Abstract

This invention discloses an MVR evaporation and crystallization device for high-salinity wastewater, specifically relating to the technical field of wastewater treatment equipment. It includes a tank, a discharge pipe, a steam exhaust pipe, and a feed pipe. A partition plate is provided in the upper part of the tank. A first sleeve is slidably connected to the middle of the partition plate, and a second sleeve is slidably fitted inside the first sleeve. A first annular scraper and a second annular scraper are respectively provided at the bottom of the first and second sleeves. A rotating shaft and a pressure plate are rotatably arranged inside the tank. A tamping rod is provided at the bottom of the pressure plate. A first driving mechanism is provided inside the tank to drive the relative movement of the first and second annular scrapers. This invention can continuously and automatically remove salt scale from the tank wall, effectively avoiding problems such as decreased heat transfer efficiency and reduced effective evaporation volume caused by salt scale accumulation, ensuring long-term stable operation of the device. The anti-clogging mechanism can complete the unblocking action while scraping the wall, fundamentally solving the problem of needing to stop the machine for manual cleaning when the discharge pipe is blocked.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and more specifically, to a high-salt wastewater MVR evaporation and crystallization device. Background Technology

[0002] With the rapid development of the chemical industry, the discharge of high-salinity wastewater from various sectors has continued to rise, posing an increasingly serious threat to the ecological environment and human health. High-salinity wastewater typically refers to wastewater with a total dissolved solids (TDS) content of not less than 3.5%, primarily containing Cl-. - SO4 2- Na + Ca 2+ Soluble inorganic ions, etc. The promulgation and implementation of the "Water Pollution Prevention and Control Action Plan" has put forward stricter requirements for comprehensively strengthening the control of pollutant discharge, enhancing the treatment of industrial pollution sources, and especially the treatment of high-salinity wastewater.

[0003] Currently, high-salinity wastewater treatment often employs MVR (Mechanical Vapor Recompression) evaporation crystallization technology. This process recovers the latent heat of secondary steam through a compression system, achieving heat energy recycling and thus energy-saving evaporation. Its basic principle is to heat the solution to vaporize part of the solvent, gradually increasing the salt concentration and creating conditions for solute crystallization.

[0004] In actual operation, as water evaporates continuously, salt crystals precipitate and settle at the bottom of the evaporator, requiring periodic discharge through the outlet pipe. However, existing MVR evaporation units exhibit two prominent problems in application: firstly, hard salt scale easily forms on the inner wall of the evaporator, reducing both heat transfer efficiency and effective evaporation volume; secondly, bottom crystallized salt often bridges or blocks the outlet pipe, leading to poor salt discharge, and in severe cases, even requiring shutdown for manual cleaning, significantly reducing production efficiency and the equipment's continuous operation capability.

[0005] To address these issues, this invention proposes an MVR evaporation and crystallization device for high-salt wastewater. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a high-salt wastewater MVR evaporation crystallization device, which solves the problems mentioned in the background art by setting a wall cleaning mechanism and an anti-clogging mechanism.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a high-salinity wastewater MVR evaporation and crystallization device, including a tank and a discharge pipe disposed at the bottom of the tank, and further comprising: A steam exhaust pipe is installed at the top of the tank body to discharge the steam generated inside the tank. A feed pipe is installed on the side wall of the tank for the flow of concentrated liquid; The wall cleaning mechanism includes a partition plate disposed in the upper part of the tank body, which divides the interior of the tank body into an upper component movement space and a lower steam generation space. A first sleeve is vertically slidably connected to the middle of the partition plate, and a second sleeve is slidably sleeved inside the first sleeve. A first annular scraper and a second annular scraper are respectively provided at the bottom of the first sleeve and the second sleeve. Both the first annular scraper and the second annular scraper are in contact with the inner wall of the tank body and are used to scrape off the salt scale on the inner wall of the tank body to improve the heat transfer efficiency of the tank body. The anti-clogging mechanism includes a rotating shaft rotatably disposed inside the tank and a pressure plate disposed at the bottom of the rotating shaft. At least one tamping rod is provided at the bottom of the pressure plate. The second sleeve is sleeved in the middle of the rotating shaft. The pressure plate can be driven by the wall cleaning mechanism to move downward, thereby driving the tamping rod to extend into the discharge pipe to break up the clumps of salt. The first driving mechanism is used to drive the first annular scraper and the second annular scraper to move relative to each other, thereby scraping off the salt scale on the inner wall of the tank. The first annular scraper and the second annular scraper work together to improve the scraping efficiency.

[0008] Furthermore, the first annular scraper and the first sleeve are fixedly connected by a plurality of circumferentially distributed first connecting rods, and the second annular scraper and the second sleeve are fixedly connected by a plurality of circumferentially distributed second connecting rods.

[0009] Furthermore, the longitudinal section of the first and second annular scrapers is double-wedge shaped, so that both the upper and lower end faces form scraping slopes, thereby achieving a better scraping effect.

[0010] Furthermore, the first driving mechanism includes two symmetrically arranged rocker arms. The top of the first sleeve and the second sleeve are respectively provided with a first fixed rod and a second fixed rod. Both the first fixed rod and the second fixed rod are provided with two free ends. Both rocker arms are located between the first fixed rod and the second fixed rod. The free end of each first fixed rod is hinged to one end of the corresponding rocker arm through a first pull rod. The free end of each second fixed rod is hinged to the other end of the same rocker arm through a second pull rod. The rocker arms can rotate around their middle parts to drive the first sleeve and the second sleeve to move in opposite directions.

[0011] Furthermore, the upper part of the tank body is provided with two symmetrical fixed plates. The bottom of the fixed plates is fixed to the partition plate. Each fixed plate is rotatably connected with two driven pulleys and one driving pulley. The driving pulley is connected to the two driven pulleys by belt drive. Each driven pulley is provided with a rocker arm. The free end of the rocker arm is hinged to the end of the corresponding swing arm.

[0012] As a further preferred technical solution, the bottom of the tank is conical with a larger top and a smaller bottom, and a connecting cylinder is vertically slidably fitted on the lower part of the rotating shaft. The connecting cylinder is equipped with a scraper that matches the shape of the bottom of the tank.

[0013] As a further preferred technical solution, a movable space is provided between the connecting cylinder and the rotating shaft. A first elastic element is provided in the movable space for continuously applying downward pressure to the connecting cylinder and acting on the scraper, so that the scraper keeps in contact with the bottom of the tank, thereby ensuring that the scraper maintains a good scraping effect.

[0014] As a further preferred technical solution, the bottom of the pressure plate is provided with a pressure cylinder sleeved outside the rotating shaft, the connecting cylinder is provided with a retaining ring located below the pressure cylinder, and the rotating shaft is sleeved with a second elastic element located between the retaining ring and the pressure cylinder for resetting the pressure plate upward.

[0015] Furthermore, a second drive mechanism is provided on the top of the tank body. The second drive mechanism includes an electric motor. The bottom of the electric motor is fixed to the top of the tank body, and the output end of the electric motor is fixed to the top of the rotating shaft. A first bevel gear is provided on the top of the rotating shaft, and a second bevel gear that meshes with the first bevel gear is provided on the drive pulley, so that the second drive mechanism drives the first drive mechanism simultaneously.

[0016] Furthermore, the outer wall of the tank is provided with multiple mounting plates evenly distributed along its circumference, which facilitates the installation of the tank in the working environment.

[0017] The technical effects and advantages of this invention are as follows: 1. This invention divides the tank interior into upper and lower spaces using a partition plate. A first annular scraper and a second annular scraper are respectively installed in the first and second sleeves, both in close contact with the inner wall of the tank. The longitudinal section of the two scrapers is double-wedge-shaped, with sharp scraping bevels on both the upper and lower ends, effectively cutting away salt scale in both upward and downward movements. The first drive mechanism, through the linkage of a swing rod and a pull rod, drives the two sleeves to move in opposite directions, causing the salt scale between the two scrapers to be repeatedly squeezed and sheared, making it easier to detach. This design continuously and automatically removes salt scale from the tank wall, effectively avoiding problems such as decreased heat transfer efficiency and reduced effective evaporation volume caused by salt scale accumulation, ensuring long-term stable operation of the device.

[0018] 2. This invention incorporates an anti-clogging mechanism consisting of a rotating shaft, a pressure plate, and a tamping rod. When the second sleeve descends, it presses against the pressure plate, causing the tamping rod to extend into the discharge pipe and crush bridged or clumped crystalline salt. Simultaneously, the motor drives the rotating shaft to rotate, causing the tamping rod to rotate and stir synchronously within the discharge pipe, further enhancing the crushing effect. This mechanism shares a single motor with the wall-cleaning mechanism, eliminating the need for an additional power source. It completes the unblocking action while scraping the wall, fundamentally solving the problem of needing to stop the machine for manual cleaning when the discharge pipe is clogged, and significantly improving the equipment's continuous operation capability.

[0019] 3. This invention requires only one electric motor, which drives the cleaning mechanism and the anti-clogging mechanism simultaneously through a bevel gear and pulley transmission chain. It features a compact structure, low cost, and good operational coordination. In Embodiment 2 of this invention, the bottom of the tank is conical to facilitate salt particle aggregation. A scraper is also provided below the rotating shaft and continuously adheres to the tank bottom through an elastic element. As the pressure plate moves downward, the scraper pressure is further increased, achieving active cleaning and pushing of the crystallized salt at the tank bottom, further improving the thoroughness of salt removal, and demonstrating significant overall practical value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a front view sectional diagram of the overall structure of the present invention.

[0022] Figure 3 For the present invention Figure 2 An enlarged schematic diagram of part A in the middle.

[0023] Figure 4 This is a schematic diagram of the overall structure of the present invention cut along the end face of the rocker arm.

[0024] Figure 5 This is a schematic diagram of the structure of the first driving mechanism in this invention.

[0025] Figure 6 This is an exploded view of the wall-cleaning mechanism in this invention.

[0026] Figure 7 This is a schematic diagram of the overall structure of the present invention cut along the end face of the drive pulley.

[0027] Figure 8 This is a top sectional view of the overall structure of the present invention.

[0028] Figure 9 This is a stepped cross-sectional view of the overall structure of the present invention.

[0029] Figure 10 For the present invention Figure 9 Enlarged schematic diagram of part B.

[0030] Figure 11 For the present invention Figure 9 An enlarged schematic diagram of section C.

[0031] The attached figures are labeled as follows: 1. Tank body; 2. Discharge pipe; 3. Exhaust pipe; 4. Feed pipe; 5. Cleaning mechanism; 501. Divider plate; 502. First sleeve; 503. Second sleeve; 504. First annular scraper; 505. Second annular scraper; 6. Anti-blocking mechanism; 601. Rotating shaft; 602. Pressure plate; 603. Tamping rod; 7. First drive mechanism; 701. Swing rod; 702. First fixing rod; 703. Second fixing rod; 704. 705. Pull rod; 8. Second pull rod; 9. First connecting rod; 10. Second connecting rod; 11. Fixing plate; 12. Drive pulley; 13. Belt; 14. Rocker arm; 15. Connecting cylinder; 16. Scraper frame; 17. First elastic element; 18. Pressure cylinder; 19. Retaining ring; 20. Second elastic element; 21. Second drive mechanism; 2001. Electric motor; 2002. First bevel gear; 2003. Second bevel gear; 21. Mounting plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1 Please refer to Figures 1 to 8 As shown, this embodiment provides a high-salinity wastewater MVR evaporation crystallization device. The device mainly includes a vertically arranged tank 1. The top of the tank 1 is equipped with a steam exhaust pipe 3 for discharging secondary steam, and the side wall of the tank 1 is equipped with a feed pipe 4 for inputting waste liquid. The bottom of the tank 1 is constricted and connected to a discharge pipe 2 for discharging crystallized salt. For ease of installation, the outer wall of the tank 1 is also equipped with multiple mounting plates 21 evenly distributed along its circumference.

[0034] The core improvement of this invention lies in the inclusion of a wall-cleaning mechanism 5, an anti-blocking mechanism 6, and a first driving mechanism 7.

[0035] The wall cleaning mechanism 5 includes a partition plate 501, which is horizontally positioned above the interior of the tank body 1. A through hole is formed in the center of the partition plate 501, and a first sleeve 502 is slidably fitted within this through hole. A second sleeve 503 is slidably fitted inside the first sleeve 502, and both the first and second sleeves 502 extend vertically. A first annular scraper 504 is fixedly connected to the bottom of the first sleeve 502 via multiple circumferentially distributed first connecting rods 8. Similarly, a second annular scraper 505 is fixedly connected to the bottom of the second sleeve 503 via multiple circumferentially distributed second connecting rods 9. The outer edges of both the first and second annular scrapers 504 and 505 maintain close contact with the inner wall of the tank body 1.

[0036] To achieve the best scraping effect, the longitudinal section of the first annular scraper 504 and the second annular scraper 505 is designed as a double wedge shape, that is, both the upper and lower ends form sharp scraping slopes, which can effectively cut the salt scale on the tank wall of the tank 1 whether it moves upward or downward.

[0037] The first driving mechanism 7 is used to drive the first annular scraper 504 and the second annular scraper 505 to move relative to each other in the vertical direction. Specifically, in this embodiment, the first driving mechanism 7 includes two swing rods 701 symmetrically arranged on the top of the tank body 1. The two swing rods 701 are initially set to vertical. A first fixed rod 702 extending laterally is fixed to the top of the first sleeve 502, and a second fixed rod 703 extending laterally is fixed to the top of the second sleeve 503. Both the first fixed rod 702 and the second fixed rod 703 have two free ends. The two swing rods 701 are located between the first fixed rod 702 and the second fixed rod 703. The two free ends of the first fixed rod 702 are respectively hinged to one end of the two swing rods 701 through two first pull rods 704, and the two free ends of the second fixed rod 703 are respectively hinged to the other end of the two swing rods 701 through two second pull rods 705.

[0038] When the swing arm 701 swings around its middle part, the transmission of the first pull rod 704 and the second pull rod 705 will drive the first fixed rod 702 and the second fixed rod 703 to move in opposite directions, thereby driving the first sleeve 502 and the second sleeve 503 to move in opposite directions, which in turn drives the first annular scraper 504 and the second annular scraper 505 to move up and down relative to each other, so that the scale between the first annular scraper 504 and the second annular scraper 505 is repeatedly squeezed and sheared, making it easier to fall off.

[0039] To drive the swing arm 701 to swing, this embodiment also provides a preferred transmission structure. Two symmetrical fixed plates 10 are fixed to the upper part of the tank body 1. Each fixed plate 10 is rotatably connected to two driven pulleys 22 and one driving pulley 11. The driving pulley 11 is connected to the two driven pulleys 22 via a belt 12, forming a belt drive system. A rocker arm 13 is fixed to each driven pulley 22, and the free end of the rocker arm 13 is hinged to the end of the corresponding swing arm 701. When the driving pulley 11 rotates, it drives the two driven pulleys 22 to rotate synchronously. The driven pulleys 22 drive the rocker arm 13 to reciprocate, thereby driving the swing arm 701 to swing.

[0040] The anti-clogging mechanism 6 includes a vertically positioned rotating shaft 601 at the center of the tank 1. A pressure plate 602 is slidably mounted on the bottom of the rotating shaft 601, and one or more tamping rods 603 are fixedly mounted on the bottom of the pressure plate 602. Initially, the pressure plate 602 is positioned above the discharge pipe 2, allowing crystalline salt to enter the discharge pipe 2 from top to bottom. In this invention, the pressure plate 602 can be driven downwards by the wall-cleaning mechanism 5. Specifically, when the second sleeve 503 in the wall-cleaning mechanism 5 descends, its bottom contacts the upper surface of the pressure plate 602, thereby pushing the pressure plate 602 to slide downwards along the rotating shaft 601, causing the tamping rods 603 to extend downwards into the discharge pipe 2. The insertion of the tamping rods 603 breaks up any bridged or clumped crystalline salt in the discharge pipe 2, restoring its fluidity and allowing it to be discharged smoothly.

[0041] The device in this embodiment also includes a second drive mechanism 20, which includes a motor 2001 fixedly mounted on the top of the tank 1. The output shaft of the motor 2001 is fixedly connected to the top of the rotating shaft 601 for driving the rotating shaft 601 to rotate. Simultaneously, a first bevel gear 2002 is fixedly mounted on the top of the rotating shaft 601, and a second bevel gear 2003 meshing with the first bevel gear 2002 is fixed on the central shaft of each drive pulley 11. Thus, when the motor 2001 drives the rotating shaft 601 to rotate, it drives the bottom pressure plate 602 and the tamping rod 603 to rotate, playing a role in stirring and assisting in crushing; on the other hand, through the transmission of the first bevel gear 2002 and the second bevel gear 2003, it drives the drive pulley 11 to rotate, which in turn drives the first annular scraper 504 and the second annular scraper 505 of the wall cleaning mechanism 5 to perform periodic relative motion through the belt 12, the driven pulley 22, the rocker arm 13, and the swing arm 701. It can be seen that a single electric motor 2001 simultaneously performs the scraping of the tank wall and the anti-clogging function at the bottom of the tank, demonstrating high structural integration and good coordination of actions.

[0042] Example 2 This embodiment is a further optimization based on Embodiment 1, mainly addressing the issue of crystalline salt deposition and cleaning at the bottom of tank 1. For ease of description, components identical to those in Embodiment 1 are referred to using the same reference numerals in this embodiment.

[0043] Please continue to refer to this. Figures 9 to 11 As shown, the main difference between this embodiment and Embodiment 1 is that the bottom of the tank 1 is designed as a cone shape, wider at the top and narrower at the bottom. This shape facilitates the convergence of crystalline salt towards the central discharge pipe 2. Additionally, a component for cleaning the bottom wall of the tank 1 is added to the anti-clogging mechanism 6.

[0044] Specifically, a connecting sleeve 14 is vertically slidably sleeved on the lower part of the rotating shaft 601. A scraper 15 that matches the conical shape of the bottom of the tank 1 is fixedly installed on the connecting sleeve 14, and the outline of the scraper 15 is close to the conical inner wall of the tank 1.

[0045] To ensure that the scraper 15 remains in close contact with the conical inner wall of the tank 1, a space is provided between the connecting cylinder 14 and the rotating shaft 601, and a first elastic element 16, such as a compression spring, is installed within this space. One end of the first elastic element 16 abuts against the top inner wall of the connecting cylinder 14, and the other end abuts against the bottom of the rotating shaft 601. Its elastic force is used to push the connecting cylinder 14 downward, so that it remains in close contact with the conical inner wall of the tank 1 when no external force is applied.

[0046] Furthermore, this embodiment optimizes the linkage between the pressure plate 602 and the connecting cylinder 14. At the bottom of the pressure plate 602, a pressure cylinder 17 is fixedly mounted, fitted around the outside of the rotating shaft 601. Inside the connecting cylinder 14, a retaining ring 18 is fixedly mounted directly below the pressure cylinder 17. A second elastic element 19 is also fitted onto the rotating shaft 601, located between the retaining ring 18 and the pressure cylinder 17. Its elastic force is used to push the pressure plate 602 upwards, keeping the pressure plate 602 in the raised position when no external force is applied.

[0047] The working process and beneficial effects of this embodiment are as follows: When the wall cleaning mechanism 5 moves downward and pushes the pressure plate 602, the pressure plate 602 overcomes the elastic force of the second elastic element 19 and moves downward. The pressure cylinder 17 at the bottom of the pressure plate 602 moves downward accordingly. Since the scraper 15 is in close contact with the conical inner wall of the tank 1, it cannot move downward, and the second elastic element 19 is gradually compressed. The elastic force generated by the compression of the second elastic element 19 acts on the retaining ring 18. The retaining ring 18 applies a downward force to the connecting cylinder 14 and the scraper 15, increasing the pressure between the scraper 15 and the tank 1, thereby enhancing the scraping effect. At the same time, the pressure plate 602 continues to move downward, and the tamping rod 603 at its bottom also penetrates into the discharge pipe 2 to clear the blockage. When the wall cleaning mechanism 5 resets upward, the pressure plate 602 resets upward under the action of the second elastic element 19, waiting for the next cleaning action.

[0048] With the above structure, this embodiment not only retains all the functions of embodiment one, but also adds the ability to actively clean the conical area at the bottom of tank 1, so that the crystallized salt deposited here can be effectively flowed to the discharge port, further improving the thoroughness of salt discharge and the operational reliability of the device.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-salinity wastewater MVR evaporation and crystallization device, comprising a tank (1) and a discharge pipe (2) disposed at the bottom of the tank (1), characterized in that, Also includes: A steam exhaust pipe (3) is installed at the top of the tank body (1); The feed pipe (4) is installed on the side wall of the tank body (1); The cleaning mechanism (5) includes a partition plate (501) disposed in the upper part of the tank (1). A first sleeve (502) is vertically slidably connected in the middle of the partition plate (501). A second sleeve (503) is slidably sleeved in the first sleeve (502). A first annular scraper (504) and a second annular scraper (505) are respectively provided at the bottom of the first sleeve (502) and the second sleeve (503). The first annular scraper (504) and the second annular scraper (505) are both in contact with the inner wall of the tank (1) and are used to scrape off the salt scale on the inner wall of the tank (1). The anti-blocking mechanism (6) includes a rotating shaft (601) rotatably disposed in the tank body (1) and a pressure plate (602) disposed at the bottom of the rotating shaft (601). The bottom of the pressure plate (602) is provided with at least one tamping rod (603). The pressure plate (602) can be driven by the wall cleaning mechanism (5) to move downward, thereby driving the tamping rod (603) to extend into the discharge pipe (2) to break up the clumps of salt. The first driving mechanism (7) is used to drive the first annular scraper (504) and the second annular scraper (505) to move relative to each other.

2. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 1, characterized in that, The first annular scraper (504) and the first sleeve (502) are fixedly connected by a plurality of first connecting rods (8) evenly distributed along the circumference, and the second annular scraper (505) and the second sleeve (503) are fixedly connected by a plurality of second connecting rods (9) evenly distributed along the circumference.

3. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 1, characterized in that, The longitudinal section of the first annular scraper (504) and the second annular scraper (505) is double wedge-shaped, so that both the upper and lower end faces form scraping slopes.

4. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 1, characterized in that, The first driving mechanism (7) includes two symmetrically arranged rocker arms (701). The top of the first sleeve (502) and the second sleeve (503) are respectively provided with a first fixed rod (702) and a second fixed rod (703). The two rocker arms (701) are located between the first fixed rod (702) and the second fixed rod (703). The free end of the first fixed rod (702) is hinged to one end of the corresponding rocker arm (701) through the first pull rod (704). The free end of the second fixed rod (703) is hinged to the other end of the same rocker arm (701) through the second pull rod (705). The rocker arm (701) can rotate around its middle part to drive the first sleeve (502) and the second sleeve (503) to move in opposite directions.

5. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 4, characterized in that, The upper part of the tank body (1) is provided with two symmetrical fixed plates (10). Each fixed plate (10) is rotatably connected with two driven pulleys (22) and one driving pulley (11). The driving pulley (11) is connected to the two driven pulleys (22) by a belt (12). Each driven pulley (22) is provided with a rocker arm (13). The free end of the rocker arm (13) is hinged to the end of the corresponding swing arm (701).

6. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 1, characterized in that, The bottom of the tank (1) is a cone shape with a larger top and a smaller bottom. A connecting cylinder (14) is vertically slidably sleeved on the lower part of the rotating shaft (601). A scraper (15) matching the shape of the bottom of the tank (1) is provided on the connecting cylinder (14).

7. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 6, characterized in that, A movable space is provided between the connecting cylinder (14) and the rotating shaft (601), and a first elastic element (16) is provided in the movable space.

8. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 6, characterized in that, The connecting cylinder (14) is provided with a retaining ring (18), and the bottom of the pressure plate (602) is provided with a pressure cylinder (17) sleeved outside the rotating shaft (601) and located above the retaining ring (18). A second elastic element (19) is sleeved on the rotating shaft (601) and located between the retaining ring (18) and the pressure cylinder (17) for resetting the pressure plate (602) upward.

9. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 1, characterized in that, The top of the tank (1) is provided with a second drive mechanism (20), which includes a motor (2001). The output end of the motor (2001) is fixed to the top of the rotating shaft (601). The top of the rotating shaft (601) is provided with a first bevel gear (2002). The drive pulley (11) is provided with a second bevel gear (2003) that meshes with the first bevel gear (2002), so that the second drive mechanism (20) drives the first drive mechanism (7) at the same time.

10. The MVR evaporation and crystallization apparatus for high-salinity wastewater according to claim 1, characterized in that, The outer wall of the tank (1) is provided with a plurality of mounting plates (21) evenly distributed along its circumference.

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