Electric heating type wastewater evaporation crystallization dryer

Abstract

The present application relates to the technical fields of wastewater evaporation crystallization, and discloses an electric heating type wastewater evaporation crystallization dryer, which comprises a rack, a transmission shaft and a disc arranged on the transmission shaft, and a spiral electric heating device arranged between the discs, which is used for continuously heating the discs to realize wastewater evaporation crystallization. The device drives the disc to rotate through a driving assembly, and sprays wastewater on the surface of the disc in a fan-shaped spraying manner through a liquid spraying assembly to form a liquid film, so that continuous evaporation crystallization is realized under the action of heating and rotation. The crystallization layer moves into the processing assembly area with the disc, the processing assembly cooperates with a thickness adjusting assembly to realize self-adaptive detection of the thickness of the crystallization layer and adjustment of the scraping gap, and a pre-crushing treatment is performed on the crystallization layer through a crystal breaking assembly, so that the subsequent scraping efficiency is improved. Meanwhile, a gas cleaning assembly sends heated gas flow to the scraping and crystal breaking areas to realize anti-adhesion and cleaning effects, and a collecting assembly is used for continuously collecting and discharging the crystallization dry material after scraping.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater evaporation and crystallization, and more specifically, relates to an electrically heated wastewater evaporation and crystallization dryer. Background Technology

[0002] The wastewater disc evaporation crystallization dryer is a steam-heated disc dryer based on the principle of contact drying. Due to its large heat transfer surface within a small space and stable operation, it is suitable for industries such as chemical manufacturing, pigment production, wastewater treatment, and ceramics.

[0003] Because the heat source is saturated steam, the equipment requires numerous steam valves, instruments, and pipelines, resulting in a complex structure, difficult installation, large size, and high cost. Furthermore, the high pressure of the saturated steam necessitates more sophisticated sealing devices to prevent leakage as it enters the heating disc. The high temperature throughout the steam passage can cause the transmission system to seize up, leading to transmission failure. Using steam as a heat source increases carbon dioxide emissions, making it unsuitable for enterprises and factories employing clean energy or striving for zero emissions.

[0004] The existing technology for wastewater evaporation and crystallization still has the following drawbacks: In the prior art, during the operation of wastewater evaporation crystallization equipment, after the wastewater is evaporated, a dense and hardened crystalline layer is easily formed on the heating surface or the surface of the rotating carrier. This crystalline layer usually has strong adhesion and high structural strength. During the scraping process, problems such as severe local adhesion, incomplete scraping, and uneven force on the scraper are likely to occur, which in turn leads to scale residue and reduced equipment operation stability.

[0005] In existing technologies, during continuous evaporation and crystallization, the thickness of the crystallized layer is often significantly uneven due to factors such as fluctuations in feed concentration, uneven distribution of heating temperature, and changes in evaporation rate. In some cases, protrusions or hard lumps may even form locally. Existing scraping mechanisms mostly use fixed gaps or simple elastic compensation structures, which are difficult to adapt to changes in the thickness of the crystallized layer in real time. This can easily lead to problems such as excessive scraping causing equipment wear or insufficient scraping resulting in crystal residue, thus affecting the overall operational reliability.

[0006] In existing technologies, the crystallization crushing, scraping and cleaning processes are usually set up independently, and there is a lack of effective coordination between the functional modules. When facing hard crystals or highly adhesive crystals, it is difficult to achieve effective pre-crushing treatment before scraping. The scraper is prone to clogging or adhesion. Moreover, the cleaning process often relies on downtime maintenance, resulting in poor continuous operation capability of the equipment and limiting the overall level of automation and processing efficiency.

[0007] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided an electrically heated wastewater evaporation crystallization dryer in order to achieve a more practical and valuable purpose. Summary of the Invention

[0008] This invention provides an electrically heated wastewater evaporation crystallization dryer to overcome the above-mentioned defects in the prior art.

[0009] The purpose and effectiveness of this invention, an electrically heated wastewater evaporation crystallization dryer, are achieved through the following specific technical means: An electrically heated wastewater evaporation crystallization dryer includes a frame, a drive shaft rotatably mounted on the frame, a pair of discs at one end of the drive shaft, a spiral electrically heated element between the discs, and the drive shaft being driven to rotate by a drive assembly. The dryer also includes: The spraying assembly is used to spray wastewater in a fan-shaped spray pattern onto both sides of the disk to form a continuous liquid film, so that a crystallization layer is formed under the action of disk rotation and heating. The processing component is located on the discharge side of the disc and includes a scraper actuation structure for scraping off the crystalline layer; The thickness measurement and adjustment component is connected to the scraper actuation structure of the processing component. It is used to detect the thickness of the crystalline layer on the surface of the disk and drive the scraper actuation structure to generate radial displacement relative to the disk according to the detection result, so as to adjust the scraping gap. The crystal breaking component is configured to cooperate with the front contact area of ​​the processing component and moves synchronously with the disk. It is used to periodically radially pre-crack and break the crystal layer to reduce the structural strength of the crystal layer. The gas cleaning component is connected to the internal gas path of the crystal breaking component and the processing component. It is used to provide heated airflow and perform anti-adhesion cleaning on the crystal breaking component and the scraper execution structure through circulating jet action. A collection component, located below the processing component, is used to collect the scraped-off crystallized dry material and achieve continuous discharge.

[0010] This solution enables continuous evaporation and crystallization of wastewater, crystal breaking pretreatment, adaptive scraping, and continuous discharge, thereby improving drying efficiency and stability.

[0011] In a further technical solution, the drive assembly includes a motor reducer, the output end of which is provided with a drive sprocket, and the outer wall of the transmission shaft is provided with a driven sprocket. The drive sprocket and the driven sprocket are connected by a chain drive to drive the disc to rotate stably.

[0012] In a further technical solution, the spraying assembly includes a circulating material tank, an inlet pump, and a spraying pipe. The inlet pump is used to transport wastewater from the circulating material tank to the spraying pipe, and the spraying pipe sprays the wastewater onto the surface of the disc in a fan-shaped atomization spray manner.

[0013] In a further technical solution, the processing component includes a support base, a mounting plate, and a scraper plate. The mounting plate has bending plates and V-shaped guide rails at both ends. The scraper plate is hinged in the V-shaped guide rails. The scraper plate is provided with a scraper assembly, which is used to scrape off the crystallized layer. The scraper assembly is disposed on the processing component.

[0014] A further technical solution includes a scraper assembly comprising a housing, inside which several movable shells are slidably disposed, and a fixed tube is fixedly disposed on the upper part of the movable shells; a roller is rotatably disposed on the outer periphery of the middle part of the fixed tube, the roller making rolling contact with the surface of the disc and used to sense changes in the thickness of the crystalline layer; several annular grooves and a thickness-measuring outer ring are axially disposed on the outer periphery of the roller, the annular grooves and the thickness-measuring outer ring being staggered to form a multi-point contact thickness-measuring structure; several crystal-breaking teeth are arranged in a circumferential array within the annular grooves, the crystal-breaking teeth being radially slidably disposed, one end of which is located inside the roller and provided with a reset elastic force by an elastic element, and the other end making sliding contact with the outer periphery of an eccentric wheel; several eccentric wheels are axially spaced on the outer periphery of the fixed tube, used to drive the crystal-breaking teeth to generate periodic radial reciprocating movement to pre-crack the crystalline layer.

[0015] In a further technical solution, the thickness measurement adjustment component includes a roller and a thickness measurement outer ring. The roller rolls in contact with the surface of the disk and generates a radial displacement signal as the thickness of the crystalline layer changes. The movable shell slides along the outer shell axis under the drive of the thickness measurement adjustment component, and drives the scraper component in the processing component to form an adaptive scraping gap with the disk. The thickness measurement adjustment component forms a displacement transmission structure through the roller and the thickness measurement outer ring.

[0016] A further technical solution includes: cylinders fixed to the outer periphery of both ends of the fixed tube; sleeves fixed to both ends of the roller; the inner wall of the sleeve slidingly engaging with the outer periphery of the fixed tube; a piston slidably mounted inside the cylinder; the piston axially engaging with the outer periphery of the sleeve via a spline to achieve synchronous rotation and axial sliding; a spiral groove with connected ends on the inner wall of the cylinder; a slider on the outer periphery of the piston; the slider moving spirally within the spiral groove to form a reciprocating gas pumping structure; a one-way valve connecting the inside of the cylinder and the inside of the fixed tube; an air inlet valve connecting the inside of the cylinder and the inside of the movable shell; a connection port connecting the inside of the fixed tube and the inside of the roller; and several pairs of spray holes inclined within the annular groove for directionally spraying circulating airflow to the crystal-breaking tooth area to achieve cleaning and anti-adhesion effects on the crystal-breaking and scraping components.

[0017] In a further technical solution, the crystal-breaking component forms a radial periodic impact structure by cooperating with an eccentric wheel and an elastic element to reduce the strength of the crystal layer structure.

[0018] In a further technical solution, the gas cleaning component includes a small air pump and a heater, used to provide heated airflow to the interior of the housing to achieve anti-adhesion and thermal cleaning.

[0019] In a further technical solution, the collection component includes a dry material guide trough and a dry material receiving box, used to guide and collect the scraped crystallized dry material and achieve continuous discharge. Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses an electrically heated wastewater evaporation crystallization dryer, which consists of a frame, a drive shaft and a disc forming a rotary evaporation body. The disc is continuously heated by electric heating. With the synergistic action of the spray pipe, the circulating material tank and the inlet pump, wastewater is evenly sprayed onto the surface of the disc to form a liquid film. Under the action of rotation and heating, the disc achieves continuous evaporation and crystallization, thereby improving the uniformity of crystal formation and the overall evaporation efficiency.

[0020] The present invention discloses an electrically heated wastewater evaporation crystallization dryer. Through the synergistic action of the processing components and the scraper components, the mounting plate, bending pressure plate, V-shaped guide rail, scraper pressure plate, adjusting pressure plate, adjusting stud, spring and wing nut form an adjustable scraping structure. Combined with the support base and the placement plate, stable support is achieved. The scraper continuously scrapes off the crystallized layer on the surface of the disc under the action of the outer shell, movable shell and fixed tube, and guides it to the dry material receiving box through the dry material guide trough to achieve continuous discharge.

[0021] This invention discloses an electrically heated wastewater evaporation crystallization dryer. A thickness-measuring adjustment structure is constructed using a thickness-measuring outer ring, rollers, annular groove, movable shell, and elastic components. This structure enables real-time sensing and response to changes in the thickness of the crystallized layer. The movable shell, guided by a fixed tube, shifts, thereby driving the scraper to form an adaptive scraping gap relative to the disc, preventing over- or under-scraping and improving scraping accuracy and stability. Simultaneously, the crystal-breaking teeth, in conjunction with an eccentric wheel, achieve pre-cracking and fissuring of the crystallized layer, reducing the strength of the crystallized structure.

[0022] The present invention discloses an electrically heated wastewater evaporation crystallization dryer, which comprises a circulating airflow jet structure consisting of a cylinder, sleeve, piston, slider, spiral groove, one-way valve, air inlet valve, and nozzle. It is combined with a small air pump, heater, elastic airbag, one-way solenoid valve, first nozzle, and second nozzle to achieve hot air cleaning and anti-adhesion treatment. At the same time, it is equipped with a motor reducer, drive sprocket, driven sprocket, chain, and conductive slip ring to ensure stable drive. The steam and waste gas are discharged under negative pressure through an induced draft fan and induced draft hood, thereby achieving continuous and stable operation of the system and efficient self-cleaning capability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the first isometric structure of the present invention; Figure 2 This is a schematic diagram of the second isometric structure of the present invention; Figure 3 This is an isometric structural diagram of the disk and electric heating element in this invention; Figure 4 This is an isometric structural diagram of the processing component in this invention; Figure 5 This is an isometric structural diagram of the scraper assembly in this invention; Figure 6 This is a first front view schematic diagram of the processing component in this invention; Figure 7 This is a schematic diagram of the second front view structure of the processing component in this invention; Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure at point AA; Figure 9 This is a front view of the scraper assembly in this invention. Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure at point BB; Figure 11 for Figure 9 Schematic diagram of the cross-sectional structure at the CC section; Figure 12 for Figure 9 Schematic diagram of the cross-sectional structure at the middle DD section; Figure 13 for Figure 12 A magnified schematic diagram of the structure at point E in the middle.

[0026] Explanation of reference numerals in the attached figures: Frame 10, Drive shaft 11, Disc 12, Electric heater 13, Motor reducer 14, Drive sprocket 15, Driven sprocket 16, Chain 17, Conductive slip ring 18, Placement plate 19, Circulating hopper 20, Dry material receiving box 21, Liquid inlet pump 22, Spray pipe 23, Processing assembly 24, Support base 25, Mounting plate 26, Bending pressure plate 27, V-shaped guide rail 28, Adjusting pressure plate 29, Adjusting stud 30, Spring 31, Wing nut 32, Scraper pressure plate 33, Scraper assembly 34, Housing 35, Dry material guide trough 36, Movable housing 37, Fixed 38. Pipe 39. Roller 40. Annular groove 41. Crystal breaking tooth 42. Elastic component 43. Eccentric wheel 44. Cylinder 45. Sleeve 46. Piston component 46. Slider 47. Spiral groove 48. One-way valve 49. Connection port 50. Spray hole 51. Thickness measuring outer ring 52. Small air pump 53. Heater 54. Movable block 55. Elastic connector 56. Elastic airbag 57. One-way solenoid valve 58. First nozzle 59. Air inlet valve 60. Second nozzle 61. Fixed seat 62. Scraper 63. Groove 64. Reset elastic component 65. Fan 66. Fan hood 67. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] As attached Figure 1 To be continued Figure 13 As shown: This invention provides an embodiment of an electrically heated wastewater evaporation crystallization dryer. See attached document Figure 1 To be continued Figure 13 The system includes a frame 10, on which a drive shaft 11 is rotatably mounted. One end of the drive shaft 11 has a pair of discs 12, and a spiral electric heater 13 is located between the discs 12. The drive shaft 11 is driven to rotate by a drive assembly. The system also includes: The spraying assembly is used to spray wastewater in a fan-shaped spray pattern onto both sides of the disk 12 to form a continuous liquid film, so as to form a crystallization layer under the action of the rotation and heating of the disk 12. The processing component 24 is disposed on the discharge side of the disc 12 and includes a scraper actuation structure for scraping off the crystalline layer; The thickness measurement and adjustment component is connected to the scraper execution structure of the processing component 24 for detecting the thickness of the crystalline layer on the surface of the disk 12, and driving the scraper execution structure to generate radial displacement relative to the disk 12 according to the detection result, so as to adjust the scraping gap. The crystal breaking component is configured to cooperate with the front contact area of ​​the processing component 24 and moves synchronously with the disk 12. It is used to periodically radially pre-crack and break the crystal layer to reduce the structural strength of the crystal layer. The gas cleaning component is connected to the internal gas path of the crystal breaking component and the processing component 24, and is used to provide heated airflow and perform anti-adhesion cleaning on the crystal breaking component and the scraper execution structure through circulating jet action. A collection component, located below the processing component 24, is used to collect the scraped-off crystallized dry material and achieve continuous discharge.

[0031] In practice, the drive assembly drives the transmission shaft 11 to rotate the disk 12; the spraying assembly sprays wastewater onto the surface of the disk 12 to form a liquid film; the electric heating 13 heats the disk 12 to cause the liquid film to evaporate and crystallize; the crystallized layer enters the processing assembly 24 area along with the disk 12; the thickness measurement and adjustment assembly detects the thickness of the crystallized layer and drives the processing assembly 24 to adjust the scraping gap; the crystal breaking assembly performs pre-cracking treatment on the crystallized layer; the gas cleaning assembly performs hot gas cleaning on the processing assembly 24 and the crystal breaking assembly; and the collection assembly collects the crystallized dry material.

[0032] Preferred options are shown in the appendix. Figure 1 To be continued Figure 4A drive shaft 11 is rotatably mounted on the side wall of the frame 10. A pair of discs 12 are mounted at one end of the drive shaft 11, and a spiral electric heater 13 is installed between the discs 12 to continuously heat them for wastewater evaporation and crystallization. A drive assembly is located inside the frame 10 to drive the drive shaft 11 to rotate. A conductive slip ring 18 is mounted at the other end of the drive shaft 11 to ensure stable power supply during rotation. A placement plate 19 is located on the outside of the frame 10. A processing assembly 24, a circulating material tank 20, and a dry material receiving box 21 are arranged on the placement plate 19. A pair of spray pipes 23 are located above the circulating material tank 20, with their nozzles positioned on either side of the discs 12 to evenly spray the wastewater concentrate onto the surface of the discs 12. A liquid inlet pump 22 is located at the bottom of the frame 10. One end of the liquid inlet pump 22 is connected to the inside of the circulating material tank 20, and the other end is connected to the spray pipes 23, enabling wastewater circulation and spray feeding.

[0033] Preferred options are shown in the appendix. Figure 4 To be continued Figure 8 The processing component 24 includes a support base 25, a mounting plate 26, a bending pressure plate 27, a V-shaped guide rail 28, a scraper pressure plate 33, and an adjusting pressure plate 29. The bending pressure plate 27 and the V-shaped guide rail 28 are fixedly mounted on the upper inclined sides of both ends of the mounting plate 26, respectively. The scraper pressure plate 33 is hinged in the V-shaped guide rail 28 and the adjusting pressure plate 29 is provided between it and the bending pressure plate 27. The mounting plate 26 has adjusting studs 30 at both ends. The outer wall of the adjusting stud 30 and the adjusting pressure plate 29 form an axial sliding fit. The upper inclined end of the adjusting stud 30 is threaded with a wing nut 32. A spring 31 is provided between the wing nut 32 and the adjusting pressure plate 29. The spring 31 is sleeved on the outer periphery of the adjusting stud 30 to provide pre-tightening force adjustment. The upper middle part of the mounting plate 26 has a dry material guide groove 36 for collecting crystallized dry material. The scraper pressure plate 33 is equipped with a scraper assembly 34.

[0034] Preferred options are shown in the appendix. Figure 9 To be continued Figure 13 The scraper assembly 34 includes a housing 35, inside which several movable shells 37 are slidably arranged. A fixed tube 38 is fixedly arranged on the upper part of the movable shells 37. A roller 39 is rotatably arranged on the outer periphery of the middle part of the fixed tube 38. Several annular grooves 40 and a thickness measuring outer ring 52 are axially arranged on the outer periphery of the roller 39. The annular grooves 40 and the thickness measuring outer ring 52 are staggered. Several crystal breaking teeth 41 are arranged in an array on the inner periphery of the annular grooves 40. The crystal breaking teeth 41 are radially slidably arranged. One end of the crystal breaking teeth 41 is located inside the roller 39 and is provided with a reset elastic force by an elastic element 42. The other end is in sliding contact with the outer periphery of the eccentric wheel 43. Several eccentric wheels 43 are axially spaced on the outer periphery of the fixed tube 38 to drive the crystal breaking teeth 41 to generate periodic radial reciprocating motion to achieve pre-cracking of the crystal layer.

[0035] Preferred options are shown in the appendix. Figure 9 To be continued Figure 13The outer periphery of the fixed tube 38 is fixed with cylinders 44 at both ends, and the outer periphery of the roller 39 is fixed with sleeves 45 at both ends. The inner wall of the sleeve 45 is slidably fitted with the outer periphery of the fixed tube 38. The cylinder 44 is axially fitted with a piston 46. The piston 46 is axially fitted with the outer periphery of the sleeve 45 by a spline. The inner wall of the cylinder 44 is provided with a spiral groove 48 that connects the beginning and end. The outer periphery of the piston 46 is provided with a slider 47 that makes spiral motion in the spiral groove 48. The cylinder 44 is connected to the inside of the fixed tube 38 with a one-way valve 49. The cylinder 44 is connected to the inside of the movable shell 37 with an air inlet valve 60. The fixed tube 38 is connected to the inside of the roller 39 with a connection port 50. Several pairs of spray holes 51 are inclined in the annular groove 40 for directional spraying of circulating airflow to the crystal breaking tooth 41 area.

[0036] Preferred options are shown in the appendix. Figure 9 To be continued Figure 11 The lower part of the movable shell 37 is fixedly provided with a fixed base 62. The fixed base 62 is provided with several grooves 64 vertically spaced inside. A scraper 63 is slidably provided in the grooves 64. A reset elastic element 65 is provided between the connecting end of the scraper 63 and the groove 64. The distance between the scraping ends of the scrapers 63 and the disc 12 gradually decreases from top to bottom to form a graded scraping structure.

[0037] Preferred options are shown in the appendix. Figure 9 To be continued Figure 11 An elastic reset assembly is provided between the movable shell 37 and the outer shell 35. The elastic reset assembly includes an elastic airbag 57 and a pair of elastic connectors 56. Several pairs of movable blocks 55 are slidably provided inside the outer shell 35. Each pair of movable blocks 55 is located on both sides of the elastic airbag 57. One end of the elastic connector 56 is hinged to the movable shell 37, and the other end is hinged to the movable block 55. A one-way solenoid valve 58 is provided inside the elastic airbag 57 and inside the outer shell 35. A first nozzle 59 is provided inside the movable shell 37 and inside the elastic airbag 57. Several second nozzles 61 are provided on the fixed base 62. A small air pump 53 and a heater 54 are installed on one side inside the outer shell 35 to provide hot airflow.

[0038] Preferred options are shown in the appendix. Figure 1 Appendix Figure 2 The drive assembly includes a motor reducer 14, with a drive sprocket 15 at the output end of the motor reducer 14 and a driven sprocket 16 on the outer wall of the drive shaft 11. The drive sprocket 15 and the driven sprocket 16 are connected by a chain 17.

[0039] Preferred options are shown in the appendix. Figure 1 Appendix Figure 2 An induced draft fan 66 is installed on the upper part of the frame 10. An induced draft hood 67 is provided on one side of the upper part of the frame 10. One end of the induced draft fan 66 is connected to the inside of the induced draft hood 67. The opening of the induced draft hood 67 faces downwards to discharge the evaporated gas under negative pressure.

[0040] Specific usage of this invention: First, the electric heater 13 is powered on, causing the spiral heating structure between the two discs 12 to uniformly heat the discs 12. When the surface temperature of the discs 12 reaches the preset process value, the liquid inlet pump 22 is started, pumping the wastewater raw liquid in the circulating material tank 20 to the spraying system and then to a pair of spray pipes 23. The spray pipes 23 then spray the raw liquid evenly in a fan shape onto both sides of the rotating discs 12, so that the raw liquid forms a continuous liquid film on the surface of the high-temperature discs 12. At the same time, the motor reducer 14 is started and outputs power, which drives the chain 17 to move through the drive sprocket 15. The chain 17 then drives the driven sprocket 16 to rotate, thereby driving the transmission shaft 11 to rotate synchronously. The transmission shaft 11 then drives the discs 12 to rotate continuously, so that the raw liquid film sprayed on its surface gradually evaporates water and forms a solid crystal layer under the combined action of rotation and heating, thereby realizing a continuous drying and crystallization process.

[0041] During the continuous rotation of the disc 12, the dried crystalline layer enters the scraping station along with the disc 12 and then enters the working range of the scraper assembly 34. First, the roller 39 comes into contact with the crystalline layer on the surface of the disc 12 and rolls synchronously. Through rolling contact, the surface morphology of the crystalline layer is monitored. The outer ring 52 measuring the thickness changes radially with the thickness of the crystalline layer and transmits the displacement to the movable shell 37, causing the movable shell 37 to move accordingly along the sliding direction inside the outer shell 35. This compresses the elastic reset assembly, causing the elastic airbag 57 and the elastic connector 56 to deform and store elastic potential energy, thereby achieving adaptive adjustment of the gap between the scraper 63 and the disc 12. When the crystalline layer is thicker, the movable shell 37 is further pushed, and the scraper 63 moves away from the disc 12 to avoid impact damage to the scraper 63 caused by thick and hard crystalline blocks. When the crystalline layer is thinner, the movable shell 37 rebounds and resets under the action of elastic reset, allowing the scraper 63 to return to the preset scraping position, thereby ensuring scraping stability and continuity.

[0042] During the movement of the roller 39 with the disk 12, its rotational motion drives the crystal-breaking teeth 41 to rotate synchronously. Since one end of the crystal-breaking teeth 41 is in continuous contact with the outer periphery of the eccentric wheel 43, under the periodic guiding action of the eccentric wheel 43 and the elastic force of the elastic element 42, the crystal-breaking teeth 41 generate radial reciprocating displacement during rotation, causing them to extend outward when approaching the crystalline layer of the disk 12, thereby performing pre-crack treatment on the continuous crystalline layer, causing the originally dense crystalline layer to form cracks, blocks, or loose structures, reducing the structural strength and adhesion for subsequent scraping, and improving the detachment efficiency.

[0043] Meanwhile, the small air pump 53 starts, drawing external gas into the housing 35 and heating it through the heater 54 to form a high-temperature airflow. During the scraping process, the displacement of the movable housing 37 further compresses the elastic airbag 57, causing the hot air inside the elastic airbag 57 to be injected into the internal space of the movable housing 37 through the first nozzle 59 under pressure, directionally blowing and cleaning the surface of the crystal breaking teeth 41 and the scraper 63 to prevent crystal adhesion and accumulation. At the same time, the lower elastic airbag 57 sprays hot air into the multi-stage scraper 63 through the second nozzle 61 to achieve continuous cleaning and anti-clogging of the scraper 63 surface, and plays an auxiliary drying role in the local crystal layer of the disc 12, thereby improving the overall drying efficiency.

[0044] Furthermore, the rotation of the roller 39 also drives the sleeve 45 and the piston 46 to move synchronously. Under the cooperation of the spiral groove 48 and the slider 47, the piston 46 moves axially back and forth during rotation, causing the gas inside the cylinder 44 to undergo periodic compression and back suction. During the suction stage, the hot gas inside the movable shell 37 is drawn into the cylinder 44 through the air inlet valve 60. During the return stage, the gas inside the cylinder 44 enters the fixed pipe 38 through the one-way valve 49 and is transported to the roller 39 through the connection port 50. Finally, it is directionally sprayed into the crystal breaking tooth 41 area by the nozzle 51 in the annular groove 40, realizing the high-temperature airflow flushing and cleaning of the crystal breaking area, further preventing crystal adhesion and improving the stability and continuity of crystal breaking.

[0045] When the crystalline layer is thick or hard crystalline blocks are formed locally, the outer thickness measuring ring 52 and the roller 39 detect abnormal thickness, and the movable shell 37 moves back as a whole, so that the fixed seat 62 and the scraper 63 move away from the disk 12 at the same time, thereby avoiding damage to the scraper 63 from hard impacts. At this time, the crystalline layer is first pre-cracked and broken by the crystal breaking teeth 41, and then enters the graded scraping stage. The upper scraper 63 removes the loose crystalline layer first, the middle scraper 63 further scrapes away the medium hardness crystalline layer, and the lower scraper 63 is used to remove the residual crystalline layer attached to the surface of the disk 12, thereby achieving a fine scraping effect that is strengthened step by step.

[0046] When the crystalline layer thins or a hard crystalline block passes through, the movable shell 37 automatically springs back to its original position under the action of the elastic reset component, so that the scraper 63 returns to the preset graded scraping position. At the same time, since the stiffness of the reset elastic element 65 corresponding to the scraper 63 at different positions gradually increases from top to bottom, the scraping force is enhanced in a gradient, thereby ensuring the uniformity and stability of scraping. Meanwhile, during long-term operation, the preload force on the adjusting pressure plate 29 can be applied by adjusting the spring 31 of the wing nut 32, so as to realize the compensation adjustment of the contact pressure between the scraper assembly 34 and the disc 12, correct the gap changes caused by wear, and ensure stable scraping output.

[0047] Finally, the water vapor and volatile gases generated during the entire evaporation and crystallization process are guided to the induced draft fan 66 under the negative pressure of the induced draft hood 67, and then transported by the induced draft fan 66 to the external waste gas treatment system for centralized discharge treatment, thereby realizing the continuous collection and safe discharge of waste gas, while ensuring that a stable evaporation environment is continuously formed inside the equipment.

[0048] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An electrically heated wastewater evaporation crystallization dryer, comprising a frame (10), a drive shaft (11) rotatably mounted on the frame (10), a pair of discs (12) at one end of the drive shaft (11), a spiral electric heater (13) between the pair of discs (12), the drive shaft (11) being driven to rotate by a drive assembly, characterized in that, Also includes: The spraying assembly is used to spray wastewater in a fan-shaped spray pattern onto both sides of the disk (12) to form a continuous liquid film, so as to form a crystallization layer under the action of the rotation and heating of the disk (12); The processing component (24) is disposed on the discharge side of the disc (12) and includes a scraper actuation structure for scraping off the crystalline layer; The thickness adjustment component is connected to the scraper execution structure of the processing component (24) for detecting the thickness of the crystalline layer on the surface of the disk (12) and driving the scraper execution structure to generate radial displacement relative to the disk (12) according to the detection result, so as to adjust the scraping gap. The crystal breaking component is configured to cooperate with the front contact area of ​​the processing component (24) and moves synchronously with the disk (12) to periodically radially pre-crack the crystal layer in order to reduce the structural strength of the crystal layer. The gas cleaning component is connected to the internal gas path of the crystal breaking component and the processing component (24) to provide heated airflow and perform anti-adhesion cleaning on the crystal breaking component and the scraper execution structure through circulating jet action; A collection component, located below the processing component (24), is used to collect the scraped crystallized dry material and achieve continuous discharge.

2. The electrically heated wastewater evaporation crystallization dryer according to claim 1, characterized in that: The drive assembly includes a motor reducer (14), the output end of which is provided with a drive sprocket (15), and the outer wall of the drive shaft (11) is provided with a driven sprocket (16). The drive sprocket (15) and the driven sprocket (16) are connected by a chain (17) to drive the disc (12) to rotate stably.

3. The electrically heated wastewater evaporation crystallization dryer according to claim 1, characterized in that: The spraying assembly includes a circulating tank (20), an inlet pump (22), and a spray pipe (23). The inlet pump (22) is used to transport the wastewater in the circulating tank (20) to the spray pipe (23), and the spray pipe (23) sprays it onto the surface of the disc (12) in a fan-shaped atomization spray manner.

4. The electrically heated wastewater evaporation crystallization dryer according to claim 1, characterized in that: The processing component (24) includes a support base (25), a mounting plate (26), and a scraper plate (33). The mounting plate (26) has a bent plate (27) and a V-shaped guide rail (28) at both ends. The scraper plate (33) is hinged in the V-shaped guide rail (28). The scraper plate (33) is provided with a scraper assembly (34). The scraper assembly (34) is used to scrape off the crystallized layer. The scraper assembly (34) is disposed on the processing component (24).

5. The electrically heated wastewater evaporation crystallization dryer according to claim 4, characterized in that: The scraper assembly (34) includes a housing (35), inside which several movable shells (37) are slidably disposed. A fixed tube (38) is fixedly disposed on the upper part of the movable shells (37). A roller (39) is rotatably disposed on the outer periphery of the middle part of the fixed tube (38). The roller (39) rolls in contact with the surface of the disc (12) and is used to sense the change in the thickness of the crystal layer. Several annular grooves (40) and a thickness measuring outer ring (52) are axially disposed on the outer periphery of the roller (39). The ring (52) is staggered to form a multi-point contact thickness measurement structure; the annular groove (40) is provided with a number of crystal breaking teeth (41) in a circumferential array. The crystal breaking teeth (41) are radially slidably arranged, with one end located inside the roller (39) and provided with a reset elastic force through the elastic element (42), and the other end slidingly contacting the outer circumference of the eccentric wheel (43); the fixed tube (38) is provided with a number of eccentric wheels (43) axially spaced on the outer circumference, which are used to drive the crystal breaking teeth (41) to generate periodic radial reciprocating motion to pre-crack the crystal layer.

6. The electrically heated wastewater evaporation crystallization dryer according to claim 5, characterized in that: The thickness adjustment component includes a roller (39) and a thickness-measuring outer ring (52). The roller (39) rolls in contact with the surface of the disk (12) and generates a radial displacement signal as the thickness of the crystalline layer changes. The movable shell (37) slides along the axial direction of the outer shell (35) under the drive of the thickness adjustment component, and drives the scraper assembly (34) to form an adaptive scraping gap with the disk (12). The thickness adjustment component forms a displacement transmission structure with the roller (39) and the thickness-measuring outer ring (52).

7. The electrically heated wastewater evaporation crystallization dryer according to claim 5, characterized in that: The fixed tube (38) has cylinders (44) fixed to its outer periphery at both ends, and sleeves (45) fixed to its two ends at both ends. The inner wall of the sleeve (45) slides with the outer periphery of the fixed tube (38). A piston (46) is axially slidably provided inside the cylinder (44). The piston (46) and the outer periphery of the sleeve (45) are axially engaged by a spline to achieve synchronous rotation and axial sliding. The inner wall of the cylinder (44) is provided with a spiral groove (48) that connects the beginning and end. A slider (47) is provided on the outer periphery of the piston (46). The slider (47) is located on the outer periphery of the piston (46). The spiral groove (48) moves in a spiral motion to form a reciprocating gas pumping structure; the inside of the cylinder (44) is connected to the inside of the fixed pipe (38) and a one-way valve (49) is provided; the inside of the cylinder (44) is connected to the inside of the movable shell (37) and an air inlet valve (60) is provided; the inside of the fixed pipe (38) is connected to the inside of the roller (39) and a connection port (50) is provided; the annular groove (40) is inclined with several pairs of spray holes (51) for directing the circulating airflow to the crystal breaking tooth (41) area to achieve the cleaning and anti-adhesion function of the crystal breaking and scraping components.

8. The electrically heated wastewater evaporation crystallization dryer according to claim 1, characterized in that: The crystal breaking component forms a radial periodic impact structure by cooperating with the eccentric wheel (43) and the elastic element (42) to reduce the strength of the crystal layer structure.

9. The electrically heated wastewater evaporation crystallization dryer according to claim 1, characterized in that: The gas cleaning assembly includes a small air pump (53) and a heater (54) for providing heated airflow into the housing (35) to achieve anti-adhesion and thermal cleaning.

10. An electrically heated wastewater evaporation crystallization dryer according to claim 1, characterized in that: The collection assembly includes a dry material guide trough (36) and a dry material receiving box (21), which are used to guide and collect the scraped crystallized dry material and achieve continuous discharge.

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