Forced circulation evaporator

Abstract

The invention relates to the field of wastewater treatment, and particularly discloses a forced circulation evaporator which comprises a heating chamber, a wastewater storage tank arranged on 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. The heating chamber is provided with a heating mechanism, the heating mechanism comprises a vertical shaft rotationally connected to the middle of the heating chamber, and heating plates are evenly arranged on the side wall of the vertical shaft in a surrounding mode. A water pressure cleaning mechanism used for cleaning the heating plate is arranged on the inner side of the heating chamber. According to the forced circulation evaporator, the heating mechanism is arranged in the heating chamber in a rotating mode, so that the temperature gradient in liquid is reduced, the heating uniformity is improved, subsequent evaporative crystallization of a wastewater storage tank is facilitated, wastewater is evaporated in a forced circulation mode, the efficiency is high, and the effect is good.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and particularly to a forced circulation evaporator. Background Art

[0002] Wastewater evaporation operation is a key process for vaporizing and separating water in wastewater by heating to achieve pollutant concentration and water resource recovery. Its core objectives are: to achieve wastewater reduction, reduce the scale and cost of subsequent treatment; to separate and recover pure condensed water to meet the reclaimed water quality standard; to treat special sewage such as high-concentration organic wastewater and heavy metal-containing wastewater that is difficult to biodegrade; evaporation technology, due to its physical treatment characteristics, does not require the addition of chemical agents and is applicable to various complex water qualities, thus becoming an important means for the advanced treatment of industrial wastewater.

[0003] Existing evaporation equipment generally adopts a fixed heating plate or heating tube structure, resulting in significant technical defects: the position of the heating element is fixed, causing a temperature gradient to form during the flow of wastewater, and the water body far from the heating surface is difficult to be fully heated, resulting in a reduction in evaporation efficiency. The fixed structure limits fluid disturbance, exacerbates local overheating and scale deposition, forming a vicious cycle; in addition, high-salt wastewater is prone to form hard scales such as calcium sulfate and calcium carbonate on the heating surface, leading to a decrease in the heat transfer coefficient, and after scaling, it is necessary to frequently stop the machine for pickling or mechanical cleaning, 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 purpose of the present invention is to provide a forced circulation evaporator, which can effectively solve the problems in the background art.

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

[0007] A forced circulation evaporator, characterized in that it includes a heating chamber, a wastewater storage tank arranged on one side of the heating chamber for storing wastewater, a lower circulation pipe connected in communication 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 connected in communication at the upper ends of the heating chamber and the wastewater storage tank. The heating chamber, the wastewater storage tank, the upper circulation pipe, and the lower circulation pipe form a closed-loop structure. The circulation pump is used to convey the wastewater in the wastewater storage tank upward from the bottom of the heating chamber. The heating chamber is provided with a heating mechanism. The heating mechanism includes a vertical shaft rotatably connected to the middle of the heating chamber. The side wall of the vertical shaft is evenly and circumferentially provided with heating plates. The upper end of the vertical shaft extends to the top of the heating chamber and is fixedly provided with a driven wheel. One end of the top of the heating chamber is rotatably connected with a driving wheel meshing with the driven wheel. One end of the top of the heating chamber is provided with a motor for driving the driving wheel to rotate;

[0008] One side of the upper end of the waste water storage tank is provided with a steam outlet, and the steam outlet is used for externally connecting a condenser. An impurity removal filter screen is arranged inside the waste water storage tank.

[0009] Preferably, a water pressure cleaning mechanism for cleaning the heating plate is arranged inside the heating chamber. The water pressure cleaning mechanism includes a fixed ring vertically and movably connected to the inner wall of the lower end of the heating chamber. A pair of driving rings are arranged inside the fixed ring along the height direction. End face gear teeth are arranged on the opposite sides of the two driving rings, and the end face gear teeth are in multiple segments. Each segment of the end face gear teeth is evenly arranged, and the multiple segments of the end face gear teeth on the two driving rings are arranged at intervals. The lower end of the vertical shaft is longitudinally and movably connected with a hollow floating shaft. An elevating column is vertically and movably connected inside the floating shaft. Second rack teeth are evenly and circumferentially fixed on the side wall of the elevating column. Rotating shafts corresponding to the second rack teeth one by one are evenly and circumferentially rotatably connected to the side surface of the floating shaft. A sector blade is fixedly arranged at the outer end of the rotating shaft. A third gear meshing with the second rack teeth is fixedly arranged at the inner end of the rotating shaft. The lower end of the floating shaft is horizontally rotatably connected with a horizontal shaft, and the end of the horizontal shaft extends between the two driving rings and is provided with a first gear meshing intermittently with the multiple segments of the end face gear teeth. The middle part of the horizontal shaft is located inside the floating shaft, and a second gear is fixedly arranged at the middle part of the horizontal shaft. A first rack tooth meshing with the second gear is vertically arranged at one end of the bottom of the elevating column, and it is configured that when each segment of the end face gear teeth meshes with the first gear, the sector blade can rotate 90 degrees. A cleaning plate capable of radially displacing along the vertical shaft is sleeved on the heating plate. A traction plate corresponding to the floating shaft is arranged at the bottom of the cleaning plate. A second guide groove is obliquely arranged on the side surface of the traction plate. A cross arm corresponding to the traction plate is fixedly arranged on the side wall of the floating shaft. A driving wheel cooperating with the second guide groove of the movable guide disc is arranged on the side wall of the cross arm, so that when the driving wheel moves upward, the traction plate drives the cleaning plate to displace.

[0010] Preferably, a partition plate is fixedly arranged at the upper end inside the floating shaft. A guide post is fixedly arranged at the bottom of the partition plate. A first guide groove adapted to the guide post is arranged at the top of the elevating column, and the elevating column is movably and guidingly 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 arranged between the top of the partition plate and the bottom of the vertical shaft.

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

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

[0014] Preferably, a second guide rod perpendicular to the vertical shaft is fixedly arranged on the side wall of the vertical shaft, and the second guide rod is located at the upper and lower ends of the heating plate. Both the upper and lower ends of the cleaning plate are movably and guidingly engaged with the second guide rod, and the cross section of the second guide rod is in a "T" shape.

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

[0016] Preferably, a "U" - shaped bracket is fixedly arranged at one end of the horizontal shaft away from the floating shaft, and the upper and lower ends of the bracket are respectively located on the opposite sides of the two driving rings. The inner sides of the two ends of the bracket are rotatably connected with supporting wheels protruding from the bracket, and the supporting wheels are in rolling cooperation with the outside of the driving rings.

[0017] Preferably, grooves are evenly arranged around the outside of the fixing ring. The lower inner wall of the heating chamber is vertically and fixedly provided with first guide rods corresponding to the grooves one by one. The fixing ring is movably and guidingly connected to the first guide rods through the grooves.

[0018] Compared with the prior art, the present invention provides a forced - circulation evaporator, which has the following beneficial effects:

[0019] 1. In this forced - circulation evaporator, the heating mechanism is arranged in the heating chamber in a rotating manner. While the heating plate heats, it stirs the liquid flowing upward, which helps to achieve more uniform heating of the liquid. Through rotation, different parts of the liquid can successively approach the heating plate, 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 subsequent wastewater storage tank, and improve the efficiency.

[0020] 2. In this forced - circulation evaporator, the water - pressure cleaning mechanism is arranged in cooperation with the heating mechanism. It can use water pressure as power to clean the outside of the heating plate during rotation, avoiding fouling from affecting the use and eliminating the need for manual disassembly and cleaning, improving the service life. Moreover, the fan - shaped leaves in the water - pressure cleaning mechanism continuously open and close, which can cause the liquid flowing upward from the bottom to continuously change the upward - flowing path, facilitating the heating of the heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a schematic structural diagram inside the heating chamber of the present invention;

[0023] Figure 3 It is the present invention Figure 2 Schematic structural diagram in the state where the heating chamber is removed based on this;

[0024] Figure 4 It is the present invention Figure 3 Schematic structural diagram in the disassembled state based on this;

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

[0026] Figure 6 It is a schematic overall structural diagram of the vertical shaft and the floating shaft of the present invention;

[0027] Figure 7 It is the present invention Figure 6 Schematic structural diagram after the floating shaft is removed based on this;

[0028] Figure 8 It is a schematic structural diagram of the sector blades on the floating shaft in the horizontal state of the present invention;

[0029] Figure 9 It is a schematic structural diagram of the sector blades on the floating shaft in the vertical state of the present invention;

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

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

[0032] Figure 12 It is the present invention Figure 11 Schematic structural diagram from another perspective based on this;

[0033] Figure 13 It is a schematic structural diagram in the state where the lifting column is separated from the third gear of the present invention;

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

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

[0036] In the figure: 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. Sector blade; 10. Fixed ring; 11. Scraping bar; 12. Driven wheel; 13. Driving wheel; 14. Driving ring; 15. End face gear teeth; 16. First guide rod; 17. Turbulence plate; 18. Floating shaft; 19. Horizontal shaft; 20. Traction plate; 21. Telescopic cover; 22. Cross arm; 23. Groove; 24. Driving wheel; 25. First gear; 26. Bracket; 27. Supporting wheel; 28. First rack; 29. Second gear; 30. Partition board; 31. Guide post; 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 screen. Detailed implementation manner

[0037] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0038] As Figures 1-4 、 Figures 6-7 shown, a forced circulation evaporator includes a heating chamber 1, a wastewater storage tank 2 arranged on one side of the heating chamber 1, a lower circulation pipe 5 connected and arranged at the lower ends of the heating chamber 1 and the wastewater storage tank 2, a circulation pump 3 arranged at one end of the lower circulation pipe 5, and an upper circulation pipe 4 connected and arranged at the upper ends of the heating chamber 1 and 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 the wastewater in the wastewater storage tank 2 upward from the bottom of the heating chamber 1. The heating chamber 1 is provided with a heating mechanism. The heating mechanism includes a vertical shaft 7 rotatably connected to the middle of the heating chamber 1. The side wall of the vertical shaft 7 is evenly and circumferentially provided with heating plates 8. 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 meshing 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 wires of the heating plates 8 extend to the inside of the vertical shaft 7 and then extend upward. And an electric slip ring can be arranged at the upper end of the vertical shaft 7 for the wires to adapt to the rotation of the vertical shaft 7. One side of the upper end of the wastewater storage tank 2 is provided with a steam outlet 43, and the steam outlet 43 is used for connecting an external condenser. An impurity removal filter screen 44 is arranged inside the wastewater storage tank 2;

[0039] As Figures 2-15As shown in the figure, 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 and movably connected to the inner wall of the lower end of the heating chamber 1. A pair of driving rings 14 are arranged along the height direction inside the fixed ring 10. End face gear teeth 15 are arranged on the opposite sides of the two driving rings 14. The end face gear teeth 15 are in multiple segments, each segment of the end face gear teeth 15 is evenly arranged, and the multiple segments of the end face gear teeth 15 on the two driving rings 14 are arranged at intervals. The lower end of the vertical shaft 7 is longitudinally and movably connected to a hollow floating shaft 18. The floating shaft 18 is movably sleeved outside the lower end of the vertical shaft 7. A telescopic cover 21 is arranged outside the movable connection between the floating shaft 18 and 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. Second rack teeth 35 are evenly and circumferentially fixed to the side wall of the lifting column 32. Rotating shafts 34 corresponding to the second rack teeth 35 one by one are evenly and circumferentially rotatably connected to the side of the floating shaft 18. A sector blade 9 is fixedly arranged at the outer end of the rotating shaft 34. A third gear 36 meshing with the second rack teeth 35 is fixedly arranged at the inner end of the rotating shaft 34. A horizontal shaft 19 is horizontally and rotatably connected to the lower end of the floating shaft 18. The end of the horizontal shaft 19 extends between the two driving rings 14 and is provided with a first gear 25 that intermittently meshes with the multiple segments of the 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 arranged at the middle part of the horizontal shaft 19. A first rack tooth 28 meshing with the second gear 29 is vertically arranged at one end of the bottom of the lifting column 32. It is configured that when each segment of the end face gear teeth 15 meshes with the first gear 25, the sector blade 9 can rotate 90 degrees. A cleaning plate 38 capable of radially displacing along the vertical shaft 7 is sleeved on the heating plate 8. A traction plate 20 corresponding to the floating shaft 18 is arranged at the bottom of the cleaning plate 38. A second guide groove 39 is obliquely arranged on the side of the traction plate 20. A cross arm 22 corresponding to the traction plate 20 is fixedly arranged on the side wall of the floating shaft 18. A driving wheel 24 cooperating with the second guide groove 39 of the movable guide disc is arranged on the side wall of the cross arm 22. Thus, when the driving wheel 24 moves upward, the traction plate 20 drives the cleaning plate 38 to displace. Moreover, two cleaning plates 38 are arranged on each heating plate 8, and the two second guide grooves 39 at the bottoms of the two cleaning plates 38 corresponding to the same heating plate 8 are in a "V" shape.

[0040] As Figures 10-12 shown, a partition plate 30 is fixedly arranged at the upper end inside the floating shaft 18. A guide post 31 is fixedly arranged at the bottom of the partition plate 30. A first guide groove 33 adapted to the guide post 31 is arranged at the top of the lifting column 32. The lifting column 32 is movably and guidingly connected 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 column 32 and increase the stability.

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

[0042] As Figures 14-15 shown, turbulence generating plates 17 are symmetrically arranged on both sides of the cleaning plate 38. When the cleaning plate 38 reciprocates radially along the vertical shaft 7, it can increase the agitation and interference of the liquid, further enhancing the heating uniformity effect.

[0043] As Figures 14-15 shown, to facilitate the limiting and guiding of the cleaning plate 38, a second guide rod 37 perpendicular to the vertical shaft 7 is fixedly arranged on the side wall of 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 in movable guiding cooperation with the second guide rod 37, and the cross-section of the second guide rod 37 is in a "T" shape.

[0044] As Figures 3-4 、 Figures 6-7 、14 - Figure 15 shown, to clean the inner wall of the heating chamber 1, a scraping strip 11 corresponding to the inner wall of the heating chamber 1 is vertically arranged at one end of the heating plate 8 away from the vertical shaft 7. Sliding frames 40 corresponding to the second guide rods 37 one by one are arranged at the upper and lower ends of the scraping strip 11 on the side close to the heating plate 8. The sliding frames 40 are of a hollow structure, and the sliding frames 40 are movably connected to the outside of the second guide rods 37. A first spring 41 is sleeved on the outside of the second guide rod 37 away from the vertical shaft 7, and the first spring 41 is located inside the sliding frame 40. Thus, when the scraping strip 11 moves away from the vertical shaft 7, the first spring 41 is compressed, and there is a gap between the scraping strip 11 and the inner wall of the heating chamber 1 in the initial state of the first spring 41.

[0045] As Figures 8-9 、 Figures 11-13 shown, to drive the overall lifting of the driving ring 14 and the fixing ring 10 when the floating shaft 18 moves up and down, and to avoid excessive pressure between the first gear 25 and the end face gear teeth 15, a "U" - shaped bracket 26 is fixedly arranged at one end of the horizontal shaft 19 away from the floating shaft 18. The upper and lower ends of the bracket 26 are respectively located on the opposite sides of the two driving rings 14. Rotating wheels 27 protruding from the bracket 26 are rotatably connected to the inner sides of the two ends of the bracket 26, and the rotating wheels 27 are in rolling cooperation with the outside of the driving ring 14.

[0046] As Figure 5 shown, to prevent the fixing ring 10 from rotating relative to the inner wall of the heating chamber 1, grooves 23 are uniformly arranged around the outside of the fixing ring 10. First guide rods 16 corresponding to the grooves 23 one by one are vertically and fixedly arranged on the lower inner wall of the heating chamber 1. The fixing ring 10 is movably and guidingly connected to the first guide rods 16 through the grooves 23.

[0047] When in use, the waste water is introduced into the waste water storage tank 2, and the circulating pump 3 is started. Under the action of the circulating pump 3, the liquid flows rapidly, enters the heating chamber 1 through the lower circulating pipe 5 for heating, and then the waste water and steam enter the waste water storage tank 2 through the upper circulating pipe 4 for evaporation. The solid impurities are filtered and blocked by the impurity removal filter screen 44. The liquid continues to fall and is pumped into the heating chamber 1, and the steam is discharged through the steam outlet 43. The steam outlet 43 is externally connected to a condenser for condensing and recovering the steam. This cycle continues. During this period, the motor 6 drives the driven wheel 12 to rotate through the driving wheel 13. The driven wheel 12 drives the heating plate 8 to rotate through the vertical shaft 7. The heating plate 8 can stir the upward flowing liquid, which helps to achieve more uniform heating of the liquid. Through rotation, different parts of the liquid can successively approach the heating plate 8, thereby receiving similar heat input. This helps to reduce the temperature gradient in the liquid and improve the uniformity of heating. And impurities in the liquid in the heating chamber 1 are likely to accumulate and scale on the inner wall of the heating chamber 1 and the heating plate 8. At this time, cleaning can be achieved by the water pressure cleaning mechanism. Specifically, when the vertical shaft 7 rotates, it will drive the floating shaft 18 to rotate synchronously. The floating shaft 18 drives the horizontal shaft 19 to rotate accordingly. Then the first gear 25 displaces between the two driving rings 14. Thus, the first gear 25 will intermittently engage with the multi-segment end face teeth 15 on the two driving rings 14. When engaging with a segment of the end face teeth 15 on one of the driving rings 14, the horizontal shaft 19 can rotate a certain angle. The horizontal shaft 19 drives the first rack 28 to longitudinally displace through the second gear 29. Then the lifting column 32 longitudinally displaces. The lifting column 32 drives the second rack 35 to longitudinally displace. The second rack 35 drives the sector blade 9 to rotate 90 degrees through the third gear 36. When engaging with a segment of the end face teeth 15 on the other driving ring 14, the sector blade 9 reverses and resets. Therefore, the sector blade 9 can be flipped from vertical to horizontal and from horizontal to vertical. And when multiple sector blades 9 are horizontal, the upward water pressure received is the largest, and when vertical, it is the smallest. When receiving a large water pressure, the sector blade 9 will drive the floating shaft 18 to move up a certain amplitude. Under the action of the bracket 26, the whole of the driving ring 14 and the fixing ring 10 also follows and moves up a certain amplitude. Then the floating shaft 18 drives the cross arm 22 to move up. The cross arm 22 drives the two cleaning plates 38 on each heating plate 8 to displace away from each other through the cooperation of the driving wheel 24 and the second guide groove 39 to realize the scraping and cleaning of the outside of the heating plate 8. And the scraping strip 11 is subject to centrifugal force, and the scraping strip 11 displaces outwards. The sliding frame 40 cooperates with the second guide rod 37 to compress the first spring 41. The scraping strip 11 contacts the inner wall of the heating chamber 1, and then realizes the scraping and cleaning of the inner wall of the heating chamber 1. When the water pressure received by the sector blade 9 decreases, the sector blade 9 gradually becomes vertical. Under the action of gravity and the reverse force of the second spring 42, the floating shaft 18 moves down and resets, and the cleaning plate 38 resets and scrapes the heating plate 8 again. This reciprocates. When the first gear 25 continuously rotates forward and backward between the two driving rings 14, the angle of the sector blade 9 can be changed, thereby changing the water pressure received by the sector blade 9. Using the water pressure as the power to continuously clean the heating plate 8, the influence of scaling on use is avoided, and the practicability is increased.The cleaning of the inner wall of the heating chamber 1 mainly utilizes centrifugal force, avoiding the scaling on the inner wall of the heating chamber 1.

[0048] The above shows and describes 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 by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A forced circulation evaporator, characterized in that, It includes a heating chamber (1), a wastewater storage tank (2) arranged on one side of the heating chamber (1) for storing wastewater, a lower circulation pipe (5) connected in communication at the lower ends of the heating chamber (1) and the wastewater storage tank (2), a circulation pump (3) arranged at one end of the lower circulation pipe (5), and an upper circulation pipe (4) connected in communication at the upper ends of the heating chamber (1) and the wastewater storage tank (2). The heating chamber (1), the wastewater storage tank (2), the upper circulation pipe (4), and the lower circulation pipe (5) form a closed-loop structure. The circulation pump (3) is used to convey the wastewater in the wastewater storage tank (2) upward from the bottom of the heating chamber (1). The heating chamber (1) is provided with a heating mechanism. The heating mechanism 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) meshing 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; One side of the upper end of the wastewater storage tank (2) is provided with a steam outlet (43), and the steam outlet (43) is used for external connection to a condenser. An impurity removal filter screen (44) is arranged inside the wastewater storage tank (2).

2. The forced circulation evaporator according to claim 1, characterized in that: Inside the heating chamber (1), a water pressure cleaning mechanism for cleaning the heating plate (8) is provided. The water pressure cleaning mechanism includes a fixed ring (10) vertically and movably connected to the inner wall of the lower end of the heating chamber (1). Inside the fixed ring (10), a pair of driving rings (14) are arranged along the height direction. On the opposite sides of the two driving rings (14), end face gear teeth (15) are provided, and the end face gear teeth (15) are in multiple segments. Each segment of the end face gear teeth (15) is evenly arranged, and the multiple segments of end face gear teeth (15) on the two driving rings (14) are arranged at intervals. The lower end of the vertical shaft (7) is longitudinally and movably connected to a hollow floating shaft (18). Inside the floating shaft (18), a lifting column (32) is vertically and movably connected. Second racks (35) are evenly and circumferentially fixed on the side wall of the lifting column (32). On the side of the floating shaft (18), rotating shafts (34) corresponding to the second racks (35) one by one are evenly and circumferentially rotatably connected. At the outer end of the rotating shaft (34), a sector blade (9) is fixedly arranged. At the inner end of the rotating shaft (34), a third gear (36) meshing with the second rack (35) is fixedly arranged. The lower end of the floating shaft (18) is horizontally rotatably connected to a horizontal shaft (19), and the end of the horizontal shaft (19) extends between the two driving rings (14) and is provided with a first gear (25) intermittently meshing with the multiple segments of 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 arranged in the middle of the horizontal shaft (19). At the bottom end of the lifting column (32), a first rack (28) meshing with the second gear (29) is vertically arranged, and it is configured that when each segment of the end face gear teeth (15) meshes with the first gear (25), the sector blade (9) can rotate 90 degrees. A cleaning plate (38) capable of radially displacing along the vertical shaft (7) is sleeved on the heating plate (8). At the bottom of the cleaning plate (38), a traction plate (20) corresponding to the floating shaft (18) is provided. On the side of the traction plate (20), a second guide groove (39) is obliquely arranged. On the side wall of the floating shaft (18), a cross arm (22) corresponding to the traction plate (20) is fixedly arranged. On the side wall of the cross arm (22), a driving wheel (24) cooperating with the second guide groove (39) of the movable guide disc is provided.

3. A forced circulation evaporator according to claim 1, characterized in that: At the upper end inside the floating shaft (18), a partition plate (30) is fixedly arranged. At the bottom of the partition plate (30), a guide post (31) is fixedly arranged. At the top of the lifting column (32), a first guide groove (33) adapted to the guide post (31) is provided, and the lifting column (32) is movably and guidingly connected to the outside of the guide post (31) through the first guide groove (33), and the cross section of the guide post (31) is a regular polygon.

4. A forced circulation evaporator according to claim 1, wherein: A second spring (42) is vertically arranged between the top of the partition plate (30) and the bottom of the vertical shaft (7).

5. A forced circulation evaporator according to claim 1, characterized in that: Two cleaning plates (38) are arranged on each heating plate (8), and the two second guide grooves (39) at the bottoms of the two cleaning plates (38) corresponding to the same heating plate (8) are in an "eight" shape.

6. A forced circulation evaporator according to claim 5, wherein: The two sides of the cleaning plate (38) are symmetrically provided with flow stirring plates (17).

7. A forced circulation evaporator according to claim 6, characterized in that: A second guide rod (37) perpendicular to the vertical shaft (7) is fixedly arranged on the side wall of 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 movably and guidingly matched with the second guide rod (37), and the cross section of the second guide rod (37) is in a "T" shape.

8. A forced circulation evaporator according to claim 7, characterized in that: A scraping strip (11) corresponding to the inner wall of the heating chamber (1) is vertically arranged at one end of the heating plate (8) far away from the vertical shaft (7). Sliding frames (40) corresponding to the second guide rods (37) one by one are arranged at the upper and lower ends of the side of the scraping strip (11) close to the heating plate (8). The sliding frames (40) are of a hollow structure, and the sliding frames (40) are movably connected to the outer sides of the second guide rods (37). A first spring (41) is sleeved on the outer side of one end of the second guide rod (37) far away from the vertical shaft (7), and the first spring (41) is located inside the sliding frame (40). Thus, when the scraping strip (11) is displaced in the direction away from the vertical shaft (7), the first spring (41) is compressed, and there is a gap between the scraping strip (11) and the inner wall of the heating chamber (1) in the initial state of the first spring (41).

9. The forced circulation evaporator according to claim 1, wherein: A bracket (26) in a "U" shape is fixedly arranged at one end of the horizontal shaft (19) far away from the floating shaft (18), and the upper and lower ends of the bracket (26) are respectively located on the opposite sides of the two driving rings (14). Rotating wheels (27) protruding from the bracket (26) are rotatably connected to the inner sides of the two ends of the bracket (26), and the rotating wheels (27) are in rolling cooperation with the outer sides of the driving rings (14).

10. A forced circulation evaporator according to claim 1, characterized in that: Grooves (23) are evenly arranged around the outer side of the fixed ring (10). First guide rods (16) corresponding to the grooves (23) one by one are vertically and fixedly arranged on the lower inner wall of the heating chamber (1). The fixed ring (10) is movably and guidingly connected to the first guide rods (16) through the grooves (23).

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