A forced circulation evaporator

Abstract

The application relates to the field of wastewater treatment, and particularly discloses a forced circulation evaporator which comprises a heating chamber, a wastewater storage tank arranged at one side of the heating chamber, a lower circulation pipe arranged at the lower ends of the heating chamber and the wastewater storage tank, a circulation pump arranged at one end of the lower circulation pipe, and an upper circulation pipe arranged at the upper ends of the heating chamber and the wastewater storage tank, wherein the heating chamber is provided with a heating mechanism, the heating mechanism comprises a vertical shaft rotatably connected to the middle part of the heating chamber, and the side walls of the vertical shaft are uniformly and circumferentially provided with heating plates; and the inner side of the heating chamber is provided with a water pressure cleaning mechanism for cleaning the heating plates. The forced circulation evaporator is rotatably arranged in the heating chamber through the arranged heating mechanism, which helps to reduce the temperature gradient in the liquid, improve the uniformity of heating, facilitate the subsequent evaporation and crystallization of the wastewater storage tank, and realize the evaporation of the wastewater in a forced circulation mode, so that the efficiency is high and the effect is good.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to a forced circulation evaporator. Background Technology

[0002] Wastewater evaporation is a key process that uses heating to vaporize and separate water in wastewater, achieving pollutant concentration and water resource recovery. Its core objectives are: to reduce wastewater volume, thereby lowering the scale and cost of subsequent treatment; to separate and recover pure condensate to meet reuse water quality standards; and to treat special wastewater that is difficult to biodegrade, such as high-concentration organic wastewater and wastewater containing heavy metals. Due to its physical treatment characteristics, evaporation technology requires no chemical additives and is applicable to various complex water qualities, making it an important means of advanced industrial wastewater treatment.

[0003] Existing evaporation equipment generally adopts a fixed heating plate or heating tube structure, which leads to significant technical defects: the fixed position of the heating element causes a temperature gradient to form during the flow of wastewater, and the water far from the heating surface cannot be fully heated, resulting in a decrease in evaporation efficiency. The fixed structure restricts fluid turbulence, exacerbates local overheating and scale deposition, and forms a vicious cycle. In addition, high-salt wastewater is prone to forming hard scale such as calcium sulfate and calcium carbonate on the heating surface, which leads to a decrease in heat transfer coefficient. Moreover, after scaling, frequent shutdowns for acid washing or mechanical cleaning are required, affecting continuous operation.

[0004] Therefore, it is necessary to propose a forced circulation evaporator to solve the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide a forced circulation evaporator that can effectively solve the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A forced circulation evaporator is characterized by comprising a heating chamber, a wastewater storage tank disposed on one side of the heating chamber for storing wastewater, a lower circulation pipe connecting the heating chamber and the lower end of the wastewater storage tank, a circulation pump disposed at one end of the lower circulation pipe, and an upper circulation pipe connecting the heating chamber and the upper end of the wastewater storage tank. The heating chamber, wastewater storage tank, upper circulation pipe, and lower circulation pipe form a closed-loop structure. The circulation pump is used to transport wastewater from the bottom of the wastewater storage tank upwards from the heating chamber. The heating chamber is provided with a heating mechanism, which includes a vertical shaft rotatably connected to the middle of the heating chamber. Heating plates are uniformly arranged around the side wall of the vertical shaft. The upper end of the vertical shaft extends to the top of the heating chamber and is fixedly provided with a driven wheel. A driving wheel that meshes with the driven wheel is rotatably connected to one end of the top of the heating chamber. A motor for driving the driving wheel to rotate is provided at one end of the top of the heating chamber.

[0008] The wastewater storage tank is provided with a steam outlet on one side of its upper end, and the steam outlet is used to connect an external condenser. The wastewater storage tank is provided with a filter screen for removing impurities on its inner side.

[0009] Preferably, the heating chamber is equipped with a water pressure cleaning mechanism for cleaning the heating plate. The water pressure cleaning mechanism includes a fixed ring vertically movably connected to the lower inner wall of the heating chamber. A pair of drive rings are arranged along the height direction on the inner side of the fixed ring. Each drive ring has a multi-segment end face tooth, with each segment evenly spaced. The multi-segment end face teeth on the two drive rings are spaced apart. A hollow floating shaft is longitudinally movably connected to the lower end of the vertical shaft. A lifting column is vertically movably connected to the inner side of the floating shaft. A second rack is evenly fixed around the side wall of the lifting column. A rotating shaft corresponding to the second rack is evenly rotatably connected around the side of the floating shaft. A fan-shaped blade is fixedly arranged at the outer end of the rotating shaft, and a third gear meshing with the second rack is fixedly arranged at the inner end of the rotating shaft. The lower end of the moving shaft is laterally rotatably connected to a horizontal shaft, and the end of the horizontal shaft extends between two drive rings and is provided with a first gear that intermittently meshes with multiple end face gear teeth. The middle part of the horizontal shaft is located inside the floating shaft, and a second gear is fixedly provided in the middle part of the horizontal shaft. A first rack that meshes with the second gear is vertically provided at one end of the bottom of the lifting column, and it is configured such that the fan-shaped blades can rotate 90 degrees when each end face gear meshes with the first gear. A cleaning plate that can be radially displaced along the vertical axis is sleeved on the heating plate. A traction plate corresponding to the floating shaft is provided at the bottom of the cleaning plate. A second guide groove is inclinedly provided on the side of the traction plate. A horizontal arm corresponding to the traction plate is fixedly provided on the side wall of the floating shaft. A drive wheel that cooperates with the movable guide disc of the second guide groove is provided on the side wall of the horizontal arm, so that when the drive wheel moves upward, the traction plate drives the cleaning plate to move.

[0010] Preferably, a partition is fixedly provided on the upper inner side of the floating shaft, a guide post is fixedly provided on the bottom of the partition, a first guide groove adapted to the guide post is provided on the top of the lifting post, and the lifting post is movably guided and connected to the outside of the guide post through the first guide groove, and the cross-section of the guide post is a regular polygon.

[0011] Preferably, a second spring is vertically disposed between the top of the partition and the bottom of the vertical shaft.

[0012] Preferably, each heating plate is provided with two cleaning plates, and the two second guide grooves at the bottom of the two cleaning plates corresponding to the same heating plate are in the shape of an "eight".

[0013] Preferably, agitator plates are symmetrically arranged on both sides of the cleaning plate.

[0014] Preferably, a second guide rod is fixedly provided on the side wall of the vertical shaft, which is perpendicular to the vertical shaft. The second guide rod is located at the upper and lower ends of the heating plate. The upper and lower ends of the cleaning plate are movably guided by the second guide rod, and the cross section of the second guide rod is "T" shaped.

[0015] Preferably, the heating plate has a vertical scraper corresponding to the inner wall of the heating chamber at one end away from the vertical axis. The upper and lower ends of the scraper near the heating plate are provided with sliding frames corresponding to the second guide rod. The sliding frame is a hollow structure and is movably connected to the outside of the second guide rod. A first spring is sleeved on the outside of the end of the second guide rod away from the vertical axis, and the first spring is located inside the sliding frame. Thus, when the scraper moves away from the vertical axis, the first spring is compressed, and in the initial state, there is a gap between the scraper and the inner wall of the heating chamber.

[0016] Preferably, a U-shaped bracket is fixedly provided at the end of the horizontal axis away from the floating axis, and the upper and lower ends of the bracket are respectively located on opposite sides of the two drive rings. The inner sides of the two ends of the bracket are rotatably connected with support rollers protruding from the bracket, and the support rollers are in rolling engagement with the outer side of the drive ring.

[0017] Preferably, the outer side of the fixing ring is uniformly surrounded by grooves, and the lower inner wall of the heating chamber is vertically fixed with a first guide rod corresponding to each groove. The fixing ring is movably guided and connected to the first guide rod through the grooves.

[0018] Compared with the prior art, the present invention provides a forced circulation evaporator with the following advantages:

[0019] 1. This forced circulation evaporator is set in the heating chamber in a rotating manner through a heating mechanism. While the heating plate heats the liquid, it agitates the upward-flowing liquid, which helps to achieve more uniform heating of the liquid. Through rotation, different parts of the liquid can approach the heating plate in turn, thereby receiving similar heat input. This helps to reduce the temperature gradient in the liquid, improve the uniformity of heating, facilitate the evaporation and crystallization of the wastewater in the subsequent wastewater storage tank, and improve efficiency.

[0020] 2. This forced circulation evaporator, through the combination of a water pressure cleaning mechanism and a heating mechanism, can use water pressure as a power source to clean the outside of the heating plate during rotation, avoiding scale buildup that affects use and eliminating the need for manual disassembly and cleaning, thus extending its service life. Moreover, the fan-shaped blades in the water pressure cleaning mechanism constantly open and close, causing the upward-flowing liquid at the bottom to continuously change its upward flow path, facilitating the heating of the heating plate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the heating chamber of the present invention;

[0023] Figure 3 This is the present invention. Figure 2 A schematic diagram of the structure with the heating chamber removed from the foundation.

[0024] Figure 4 This is the present invention. Figure 3 A schematic diagram of the structure in its disassembled state.

[0025] Figure 5 This is a structural diagram of the drive ring, the first guide rod, and the fixing ring of the present invention in a disassembled state;

[0026] Figure 6 This is a schematic diagram of the overall structure of the vertical axis and floating axis of the present invention;

[0027] Figure 7 This is the present invention. Figure 6 A schematic diagram of the structure after the floating shaft is removed from the foundation;

[0028] Figure 8 This is a schematic diagram of the structure of the fan-shaped blades on the floating shaft of the present invention in a horizontal state;

[0029] Figure 9 This is a schematic diagram of the structure of the fan-shaped blades on the floating shaft of the present invention in a vertical state;

[0030] Figure 10 This is a cross-sectional structural diagram of the floating shaft of the present invention;

[0031] Figure 11 This is a structural schematic diagram of the floating shaft and lifting column of the present invention in their disassembled state;

[0032] Figure 12 This is the present invention. Figure 11 A structural diagram from another perspective based on the above;

[0033] Figure 13 This is a schematic diagram of the structure of the present invention in the state where the lifting column and the third gear are separated;

[0034] Figure 14 This is a schematic diagram of the heating plate of the present invention;

[0035] Figure 15 This is a structural diagram of the cleaning plate and heating plate of the present invention in their disassembled state.

[0036] In the diagram: 1. Heating chamber; 2. Wastewater storage tank; 3. Circulation pump; 4. Upper circulation pipe; 5. Lower circulation pipe; 6. Motor; 7. Vertical shaft; 8. Heating plate; 9. Fan-shaped blade; 10. Fixed ring; 11. Scraper; 12. Driven wheel; 13. Driving wheel; 14. Drive ring; 15. End face gear teeth; 16. First guide rod; 17. Stirring plate; 18. Floating shaft; 19. Horizontal shaft; 20. Traction plate; 21. Telescopic cover; 22. Horizontal arm; 23. Groove 24. Drive wheel; 25. First gear; 26. Bracket; 27. Support roller; 28. First rack; 29. ​​Second gear; 30. Partition; 31. Guide column; 32. Lifting column; 33. First guide groove; 34. Rotating shaft; 35. Second rack; 36. Third gear; 37. Second guide rod; 38. Cleaning plate; 39. Second guide groove; 40. Sliding frame; 41. First spring; 42. Second spring; 43. Steam outlet; 44. Impurity removal filter. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1-4 , Figures 6-7 As shown, a forced circulation evaporator includes a heating chamber 1, a wastewater storage tank 2 disposed on one side of the heating chamber 1, a lower circulation pipe 5 connecting the heating chamber 1 and the lower end of the wastewater storage tank 2, a circulation pump 3 disposed at one end of the lower circulation pipe 5, and an upper circulation pipe 4 connecting the heating chamber 1 and the upper end of the wastewater storage tank 2. The wastewater storage tank 2, the heating chamber 1, the lower circulation pipe 5, and the upper circulation pipe 4 form a closed-loop structure. The circulation pump 3 can transport wastewater from the bottom of the wastewater storage tank 2 upwards from the bottom of the heating chamber 1. The heating chamber 1 is provided with a heating mechanism, which includes a vertical shaft 7 rotatably connected to the middle of the heating chamber 1. The sidewall of the vertical shaft 7 is uniformly surrounded. A heating plate 8 is provided. The upper end of the vertical shaft 7 extends to the top of the heating chamber 1 and is fixedly provided with a driven wheel 12. One end of the top of the heating chamber 1 is rotatably connected to a driving wheel 13 that meshes with the driven wheel 12. One end of the top of the heating chamber 1 is provided with a motor 6 for driving the driving wheel 13 to rotate. The vertical shaft 7 is a hollow structure. The wire of the heating plate 8 extends to the inside of the vertical shaft 7 and then extends upward. An electric slip ring can be provided at the upper end of the vertical shaft 7 to allow the wire to adapt to the rotation of the vertical shaft 7. A steam outlet 43 is provided on one side of the upper end of the wastewater storage tank 2, and the steam outlet 43 is used to connect an external condenser. A filter screen 44 is provided on the inside of the wastewater storage tank 2.

[0039] like Figures 2-15As shown, a water pressure cleaning mechanism for cleaning the heating plate 8 is provided inside the heating chamber 1. The water pressure cleaning mechanism includes a fixed ring 10 vertically movably connected to the lower inner wall of the heating chamber 1. A pair of drive rings 14 are provided on the inner side of the fixed ring 10 along the height direction. Each of the two drive rings 14 has end face teeth 15 on opposite sides. The end face teeth 15 are multi-segmented, and each segment of end face teeth 15 is evenly distributed. The multiple segments of end face teeth 15 on the two drive rings 14 are spaced apart. A hollow floating shaft 18 is movably connected to the lower end of the vertical shaft 7. The floating shaft 18 is movably sleeved. A telescopic cover 21 is provided on the outside of the movable connection between the floating shaft 18 and the vertical shaft 7, attached to the lower end of the vertical shaft 7. The telescopic cover 21 can seal the movable connection. A lifting column 32 is vertically and movably connected to the inside of the floating shaft 18. A second rack 35 is uniformly and fixed around the side wall of the lifting column 32. A rotating shaft 34 corresponding to the second rack 35 is uniformly and rotatably connected around the side of the floating shaft 18. A fan-shaped blade 9 is fixedly provided at the outer end of the rotating shaft 34. A third gear 36 that meshes with the second rack 35 is fixedly provided at the inner end of the rotating shaft 34. The lower end of the floating shaft 18 is horizontally... A horizontal shaft 19 is rotatably connected to the upper part of the heating plate 8. The end of the horizontal shaft 19 extends between the two drive rings 14 and is provided with a first gear 25 that intermittently meshes with multiple end face teeth 15. The middle part of the horizontal shaft 19 is located inside the floating shaft 18, and a second gear 29 is fixedly provided in the middle part of the horizontal shaft 19. A first rack 28 that meshes with the second gear 29 is vertically provided at one end of the bottom of the lifting column 32. The configuration is such that when each end face tooth 15 meshes with the first gear 25, the fan-shaped blade 9 can rotate 90 degrees. A cleaning plate 38 that can be radially displaced along the vertical axis 7 is sleeved on the heating plate 8. The bottom of the cleaning plate 38 is provided with a traction plate 20 corresponding to the floating shaft 18. The side of the traction plate 20 is provided with a second guide groove 39 at an angle. The side wall of the floating shaft 18 is fixedly provided with a cross arm 22 corresponding to the traction plate 20. The side wall of the cross arm 22 is provided with a drive wheel 24 that cooperates with the movable guide plate of the second guide groove 39. When the drive wheel 24 moves upward, the traction plate 20 drives the cleaning plate 38 to move. Moreover, each heating plate 8 is provided with two cleaning plates 38, and the two second guide grooves 39 at the bottom of the two cleaning plates 38 corresponding to the same heating plate 8 are in the shape of an "eight".

[0040] like Figures 10-12 As shown, a partition plate 30 is fixedly installed on the upper inner side of the floating shaft 18, and a guide post 31 is fixedly installed at the bottom of the partition plate 30. A first guide groove 33 adapted to the guide post 31 is provided on the top of the lifting post 32, and the lifting post 32 is movably guided to the outside of the guide post 31 through the first guide groove 33. The cross-section of the guide post 31 is a regular polygon, which can guide the lifting post 32 and increase stability.

[0041] like Figures 10-12As shown, a second spring 42 is vertically arranged between the top of the partition 30 and the bottom of the vertical shaft 7. The second spring 42 facilitates the downward movement and reset of the floating shaft 18 when the water pressure is low.

[0042] like Figures 14-15 As shown, agitator plates 17 are symmetrically arranged on both sides of the cleaning plate 38. When the cleaning plate 38 moves back and forth along the radial direction of the vertical axis 7, it can increase the agitation of the liquid and further enhance the uniform heating effect.

[0043] like Figures 14-15 As shown, in order to facilitate the positioning and guidance of the cleaning plate 38, a second guide rod 37 is fixedly installed on the side wall of the vertical axis 7, which is perpendicular to the vertical axis 7. The second guide rod 37 is located at the upper and lower ends of the heating plate 8. The upper and lower ends of the cleaning plate 38 are in movable guidance cooperation with the second guide rod 37, and the cross section of the second guide rod 37 is "T" shaped.

[0044] like Figures 3-4 , Figures 6-7 14- Figure 15 As shown, in order to clean the inner wall of the heating chamber 1, a scraper 11 corresponding to the inner wall of the heating chamber 1 is vertically arranged at the end of the heating plate 8 away from the vertical axis 7. The upper and lower ends of the scraper 11 near the heating plate 8 are provided with sliding frames 40 corresponding to the second guide rod 37. The sliding frame 40 is a hollow structure and is movably connected to the outside of the second guide rod 37. A first spring 41 is sleeved on the outside of the end of the second guide rod 37 away from the vertical axis 7, and the first spring 41 is located inside the sliding frame 40. When the scraper 11 moves away from the vertical axis 7, the first spring 41 is compressed, and in the initial state, there is a gap between the scraper 11 and the inner wall of the heating chamber 1.

[0045] like Figures 8-9 , Figures 11-13 As shown, in order to drive the drive ring 14 and the fixed ring 10 to move up and down as a whole when the floating shaft 18 is raised and lowered, and to avoid excessive pressure between the first gear 25 and the end face gear teeth 15, a "U"-shaped bracket 26 is fixedly provided at the end of the horizontal shaft 19 away from the floating shaft 18. The upper and lower ends of the bracket 26 are located on opposite sides of the two drive rings 14, and the inner sides of both ends of the bracket 26 are rotatably connected to the support rollers 27 protruding from the bracket 26, and the support rollers 27 are in rolling engagement with the outer side of the drive ring 14.

[0046] like Figure 5 As shown, in order to prevent the fixed ring 10 from rotating relative to the inner wall of the heating chamber 1, grooves 23 are uniformly arranged around the outer side of the fixed ring 10. The lower inner wall of the heating chamber 1 is vertically fixed with first guide rods 16 corresponding to the grooves 23. The fixed ring 10 is movably guided and connected to the first guide rods 16 through the grooves 23.

[0047] During operation, wastewater is fed into wastewater storage tank 2, and circulation pump 3 is started. Under the action of circulation pump 3, the liquid flows rapidly and enters heating chamber 1 through lower circulation pipe 5 for heating. Then, wastewater and steam enter wastewater storage tank 2 through upper circulation pipe 4 for evaporation. Solid impurities are filtered and blocked by impurity removal filter screen 44. The liquid continues to fall and is drawn into heating chamber 1, while steam is discharged through steam outlet 43. Steam outlet 43 is connected to an external condenser for condensation and recovery of steam. This cycle continues. During this process, motor 6 drives driven wheel 12 to rotate via drive wheel 13. Driven wheel 12 drives heating plate 8 to rotate via vertical shaft 7. Heating plate 8 can agitate the upward-flowing liquid, which helps to achieve more uniform heating of the liquid. Through rotation, different parts of the liquid can approach heating plate 8 in sequence. This allows for similar heat input, which helps reduce the temperature gradient in the liquid and improve heating uniformity. Furthermore, impurities in the liquid in the heating chamber 1 easily accumulate and form scale on the inner wall of the heating chamber 1 and the heating plate 8. This scale can be cleaned by a water pressure cleaning mechanism. Specifically, when the vertical shaft 7 rotates, it drives the floating shaft 18 to rotate synchronously. The floating shaft 18 then drives the horizontal shaft 19 to rotate accordingly. Consequently, the first gear 25 moves between the two drive rings 14, intermittently meshing with the multi-segment end-face teeth 15 on the two drive rings 14. When meshing with one segment of the end-face teeth 15 on one of the drive rings 14, the horizontal shaft 19 can rotate at a certain angle. The horizontal shaft 19, through the second gear 29, drives the first rack 28 to move longitudinally, thereby raising and lowering the column 3. 2. Longitudinal displacement: The lifting column 32 drives the second rack 35 to move longitudinally. The second rack 35 drives the fan-shaped blade 9 to rotate 90 degrees through the third gear 36. When it meshes with a section of end face gear 15 on another drive ring 14, the fan-shaped blade 9 reverses and resets. Therefore, the fan-shaped blade 9 can flip from vertical to horizontal and from horizontal to vertical. When multiple fan-shaped blades 9 are horizontal, the upward water pressure is the greatest, and when vertical, it is the least. When subjected to high water pressure, the fan-shaped blade 9 will drive the floating shaft 18 to move upward by a certain amount. Under the action of the bracket 26, the drive ring 14 and the fixed ring 10 as a whole also move upward by a certain amount. Then, the floating shaft 18 drives the horizontal arm 22 to move upward. The horizontal arm 22, through the cooperation of the drive wheel 24 and the second guide groove 39, moves the two cleaning plates 38 on each heating plate 8 back to back. The displacement mechanism cleans the outer side of the heating plate 8 by scraping. The scraper 11, subjected to centrifugal force, moves outwards. The sliding frame 40, in conjunction with the second guide rod 37, compresses the first spring 41, causing the scraper 11 to contact the inner wall of the heating chamber 1, thus cleaning the inner wall. As the water pressure on the fan-shaped blade 9 decreases, the blade gradually straightens. Under the influence of gravity and the reverse force of the second spring 42, the floating shaft 18 moves downwards and resets, and the cleaning plate 38 resets to scrape the heating plate 8 again. This process repeats. The first gear 25, rotating continuously between the two drive rings 14, changes the angle of the fan-shaped blade 9, thereby changing the water pressure on it. Using water pressure as a power source continuously cleans the heating plate 8, preventing scale buildup and improving usability.The cleaning of the inner wall of heating chamber 1 is mainly achieved using centrifugal force, thus preventing scale buildup.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A forced circulation evaporator, characterized in that, The system includes a heating chamber (1), a wastewater storage tank (2) located on one side of the heating chamber (1) for storing wastewater, a lower circulation pipe (5) connecting the heating chamber (1) and the wastewater storage tank (2) at their lower ends, a circulation pump (3) located at one end of the lower circulation pipe (5), and an upper circulation pipe (4) connecting the heating chamber (1) and the wastewater storage tank (2) at their upper ends. The heating chamber (1), wastewater storage tank (2), upper circulation pipe (4), and lower circulation pipe (5) form a closed-loop structure. The circulation pump (3) is used to pump wastewater from the wastewater storage tank (2) out of the heating chamber (1). The heating chamber (1) is equipped with a heating mechanism, which includes a vertical shaft (7) rotatably connected to the middle of the heating chamber (1). Heating plates (8) are evenly arranged around the side wall of the vertical shaft (7). The upper end of the vertical shaft (7) extends to the top of the heating chamber (1) and is fixedly provided with a driven wheel (12). One end of the top of the heating chamber (1) is rotatably connected with a driving wheel (13) that meshes with the driven wheel (12). One end of the top of the heating chamber (1) is provided with a motor (6) for driving the driving wheel (13) to rotate. A steam outlet (43) is provided on one side of the upper end of the wastewater storage tank (2), and the steam outlet (43) is used to connect an external condenser. A filter screen (44) is provided on the inner side of the wastewater storage tank (2). The heating chamber (1) is equipped with a water pressure cleaning mechanism for cleaning the heating plate (8). The water pressure cleaning mechanism includes a fixed ring (10) vertically movably connected to the lower inner wall of the heating chamber (1). A pair of drive rings (14) are arranged along the height direction on the inner side of the fixed ring (10). Each of the two drive rings (14) has end face teeth (15) on its opposite side. The end face teeth (15) are multi-segmented, and each segment of end face teeth (15) is evenly arranged. The multiple segments of end face teeth (15) on the two drive rings (14) are spaced apart. The lower end of the vertical shaft (7) is longitudinally movably connected to a hollow floating shaft (18). A lifting column (32) is vertically movably connected to the inner side of the floating shaft (18). A second rack (35) is uniformly and fixedly arranged around the side wall of the lifting column (32). A rotating shaft (34) corresponding to the second rack (35) is uniformly and rotatably connected around the side of the floating shaft (18). A fan-shaped blade (9) is fixedly arranged at the outer end of the rotating shaft (34). A third gear (36) meshing with the second rack (35) is fixedly arranged at the inner end of the rotating shaft (34). The lower end of the moving shaft (18) is laterally rotatably connected to a horizontal shaft (19), and the end of the horizontal shaft (19) extends between two drive rings (14) and is provided with a first gear (25) that intermittently meshes with multiple end face gear teeth (15). The middle part of the horizontal shaft (19) is located inside the floating shaft (18), and a second gear (29) is fixedly provided in the middle part of the horizontal shaft (19). The bottom end of the lifting column (32) is vertically provided with a first rack (28) that meshes with the second gear (29), and is configured such that each end face gear tooth (15) meshes with the first gear (19). 25) When engaged, the fan-shaped blades (9) can rotate 90 degrees. A cleaning plate (38) that can be radially displaced along the vertical axis (7) is sleeved on the heating plate (8). A traction plate (20) corresponding to the floating shaft (18) is provided at the bottom of the cleaning plate (38). A second guide groove (39) is inclinedly provided on the side of the traction plate (20). A cross arm (22) corresponding to the traction plate (20) is fixedly provided on the side wall of the floating shaft (18). A drive wheel (24) that cooperates with the movable guide plate of the second guide groove (39) is provided on the side wall of the cross arm (22).

2. The forced circulation evaporator according to claim 1, characterized in that: A partition (30) is fixedly provided on the upper inner side of the floating shaft (18), and a guide post (31) is fixedly provided on the bottom of the partition (30). A first guide groove (33) adapted to the guide post (31) is provided on the top of the lifting post (32), and the lifting post (32) is movably guided to the outside of the guide post (31) through the first guide groove (33). The cross-section of the guide post (31) is a regular polygon.

3. A forced circulation evaporator according to claim 2, characterized in that: A second spring (42) is vertically arranged between the top of the partition (30) and the bottom of the vertical shaft (7).

4. A forced circulation evaporator according to claim 1, characterized in that: Each heating plate (8) is provided with two cleaning plates (38), and the two second guide grooves (39) at the bottom of the two cleaning plates (38) corresponding to the same heating plate (8) are in the shape of "eight".

5. A forced circulation evaporator according to claim 4, characterized in that: The cleaning plate (38) is symmetrically provided with agitator plates (17) on both sides.

6. A forced circulation evaporator according to claim 5, characterized in that: The side wall of the vertical shaft (7) is fixedly provided with a second guide rod (37) that is perpendicular to the vertical shaft (7), and the second guide rod (37) is located at the upper and lower ends of the heating plate (8). The upper and lower ends of the cleaning plate (38) are both movably guided and cooperated with the second guide rod (37), and the cross section of the second guide rod (37) is "T" shaped.

7. A forced circulation evaporator according to claim 6, characterized in that: The heating plate (8) is vertically provided with a scraper (11) corresponding to the inner wall of the heating chamber (1) at one end away from the vertical axis (7). The upper and lower ends of the scraper (11) near the heating plate (8) are provided with sliding frames (40) corresponding to the second guide rod (37). The sliding frame (40) is a hollow structure and is movably connected to the outside of the second guide rod (37). The second guide rod (37) is sleeved with a first spring (41) at the outside of one end away from the vertical axis (7). The first spring (41) is located inside the sliding frame (40). When the scraper (11) moves away from the vertical axis (7), the first spring (41) is compressed. In the initial state, there is a gap between the scraper (11) and the inner wall of the heating chamber (1).

8. A forced circulation evaporator according to claim 1, characterized in that: The horizontal axis (19) is fixedly provided with a "U"-shaped bracket (26) at one end away from the floating axis (18), and the upper and lower ends of the bracket (26) are respectively located on opposite sides of the two drive rings (14). The inner sides of the two ends of the bracket (26) are rotatably connected with rollers (27) protruding from the bracket (26), and the rollers (27) are in rolling cooperation with the outer side of the drive ring (14).

9. A forced circulation evaporator according to claim 1, characterized in that: The outer side of the fixing ring (10) is uniformly surrounded by grooves (23), and the lower inner wall of the heating chamber (1) is vertically fixed with a first guide rod (16) corresponding to the groove (23). The fixing ring (10) is movably guided and connected to the first guide rod (16) through the groove (23).

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