A device for treating wastewater in a process for producing urea for vehicles

Abstract

The application relates to a wastewater treatment device in a vehicle urea production process, which comprises a neutralization reaction tank, multiple adsorption tanks with high-efficiency activated carbon, a disinfection discharge tank and an arc-shaped stirring pipe, a limiting ring groove rotating with a limiting ring is arranged on the inner side of the arc-shaped stirring pipe, an arc-shaped rod is fixedly connected to the limiting ring, and a liquid discharge gap is arranged between the adjacent two arc-shaped rods; the device further comprises a fixing plate, a sliding rod and a pressing plate, the bottom of the fixing plate is provided with a pressing groove for reciprocating movement of the pressing plate; through rotation and stirring of the arc-shaped stirring pipe, relative movement and extrusion of the arc-shaped rods to spray wastewater from the spray holes and the liquid discharge gap, and reciprocating extrusion of the pressing plate to the bottom wastewater, multi-dimensional and multi-level three-dimensional stirring and extrusion linkage are realized; the turbulent intensity and the fluid microcirculation effect of the wastewater in the neutralization reaction tank are greatly enhanced, the mixing dead angle existing in the traditional stirring device is effectively eliminated, and the mixing uniformity and the reaction efficiency of the chemical reactants and the wastewater are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of multi-stage wastewater treatment technology in urea production, specifically a wastewater treatment device in the production process of automotive urea. Background Technology

[0002] The production process of automotive urea (i.e., diesel engine exhaust fluid, DEF) inevitably generates process wastewater containing high concentrations of organic matter, ammonia nitrogen, and suspended solids. Direct discharge of this wastewater would severely pollute aquatic environments, leading to eutrophication and depletion of dissolved oxygen. Therefore, this type of wastewater must undergo rigorous multi-stage treatment before discharge.

[0003] Currently, most common wastewater treatment devices employ a series process of "neutralization reaction + activated carbon adsorption + disinfection." The neutralization tank, as the core reaction unit, is typically equipped with a stirring mechanism to promote the mixing of chemical reactants (such as acids or alkalis) with the wastewater. However, existing stirring mechanisms are mostly simple paddle or spiral agitators with fixed rotation trajectories, relying primarily on the circulation of the overall liquid flow for mixing, resulting in dead zones. Especially at the bottom of the tank, poor fluid flow can easily lead to excessively high local concentrations of reactants or incomplete reactions, resulting in low neutralization efficiency. This, in turn, affects the treatment effect of subsequent adsorption and disinfection stages, ultimately making it difficult for the treated water quality to consistently meet standards.

[0004] Therefore, a wastewater treatment device for the production process of automotive urea is proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a wastewater treatment device in the production process of automotive urea.

[0006] The objective of this invention is achieved through the following technical solution: A wastewater treatment device for the production process of automotive urea, comprising: a multi-stage treatment system, the multi-stage treatment system including a neutralization reaction tank with a dosing mechanism, multiple adsorption tanks with high-efficiency activated carbon, and a disinfection and discharge tank; an arc-shaped stirring tube is rotatably connected inside the neutralization reaction tank, a limiting ring groove is formed on the inner side of the arc-shaped stirring tube, a limiting ring moves within the limiting ring groove, and multiple arc-shaped rods that move within the arc-shaped stirring tube are fixedly connected to the limiting ring, with a discharge gap provided between two adjacent arc-shaped rods; a fixing plate is fixedly connected to the arc-shaped stirring tube, and a sliding fit is provided within the fixing plate. The rod and slide rod drive the limiting ring to rotate; the bottom of the slide rod is equipped with a squeezing plate, and the bottom of the fixed plate is equipped with a squeezing groove for the reciprocating movement of the pressure plate, thereby squeezing the wastewater at the bottom of the neutralization reaction tank; through the rotation of the arc-shaped stirring tube, the relative movement of the arc-shaped rod squeezing the wastewater out from the spray hole and the drain gap, and the reciprocating squeezing of the wastewater at the bottom by the squeezing plate, multi-dimensional and multi-level three-dimensional stirring and squeezing linkage is realized; the turbulence intensity and fluid micro-circulation effect of the wastewater in the neutralization reaction tank are greatly enhanced, the mixing dead zone existing in traditional stirring devices is effectively eliminated, and the mixing uniformity and reaction efficiency of chemical reactants and wastewater are significantly improved.

[0007] As a further description of the above technical solution:

[0008] The neutralization reaction vessel is fixedly connected to a motor, and the output shaft of the motor is fixedly connected to a rotating main shaft that is connected to and fixed to the arc-shaped stirring tube. Through the direct transmission between the motor and the rotating main shaft, a stable and reliable power input is provided for the continuous rotation of the arc-shaped stirring tube, ensuring that the stirring process can be carried out continuously.

[0009] As a further description of the above technical solution:

[0010] Inside the neutralization reaction vessel, there are inclined guide discs fixedly connected by connecting rods. The guide discs have clearance grooves in the middle for the rotation of the main shaft. Two connecting plates located on the top and bottom surfaces of the guide discs are fixedly connected to the top of the sliding rods.

[0011] As a further description of the above technical solution:

[0012] A rotating column is rotatably connected to the connecting plate. The end of the rotating column is provided with a pressing inclined surface that presses against the guide plate. Through the reaction action of the guide plate, the sliding rod that makes circular motion moves up and down reciprocally.

[0013] As a further description of the above technical solution:

[0014] The slide bar has a raised plate in the middle and a movable groove on the side of the fixed plate. The slide bar is fixedly connected to a sliding plate, and multiple baffles with different inclination angles are fixedly connected to the end of the sliding plate. The baffles with different inclination angles will cause disturbances to the wastewater in different directions and with different forces during the movement.

[0015] As a further description of the above technical solution:

[0016] The bottom end of the slide rod is fixedly connected to a toothed plate that is also fixedly connected to the extrusion plate. A rotating shaft is rotatably connected to the fixed plate. One end of the rotating shaft is fixedly connected to a gear that meshes with the toothed plate, and the other end of the rotating shaft is fixedly connected to a connecting rod between it and the limiting ring, which converts the linear reciprocating motion of the slide rod into the rotational motion of the limiting ring.

[0017] As a further description of the above technical solution:

[0018] The fixed plate is fixedly connected to a limiting sleeve that rotates with the shaft. The limiting sleeve provides stable rotational support and axial limiting for the shaft, ensuring that the shaft will not deviate or wobble when it is rotated under force. This ensures the accuracy of gear meshing with the gear plate and the stability of the connecting rod drive limiting ring, thereby improving the reliability of the entire transmission system.

[0019] As a further description of the above technical solution:

[0020] The bottom of the fixed plate is fixedly connected to a diffusion guide frame that is wide at the bottom and narrow at the top. When the wastewater enters from the narrow top and exits from the wide bottom, the flow rate will change.

[0021] As a further description of the above technical solution:

[0022] The arc-shaped stirring tube is provided with a spray hole, which is matched with the liquid discharge gap to achieve spraying in multiple directions.

[0023] As a further description of the above technical solution:

[0024] The total circumference of the multiple arc-shaped rods is greater than the circumference of the arc-shaped stirring tube, ensuring that the arc-shaped rods are always connected to the arc-shaped stirring tube.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] When the arc-shaped stirring tube rotates as a whole for basic stirring, the slide rod slides up and down reciprocally under the action of the guide plate during rotation. On the one hand, it drives the bottom extrusion plate to reciprocate within the extrusion groove, repeatedly extruding the wastewater at the bottom of the neutralization reaction tank, forcing the bottom liquid to participate in circulation and eliminating mixing dead zones. On the other hand, the slide rod, through the meshing transmission of the toothed plate and gears, drives the limiting ring and the arc-shaped rod to rotate relative to the arc-shaped stirring tube. During rotation, the arc-shaped rod continuously extrudes the wastewater within the arc-shaped stirring tube, causing the water to be ejected at high speed from the spray hole and the discharge gap, forming a local jet. The synergistic effect of these structures significantly enhances the turbulence intensity and fluid micro-circulation effect of the wastewater within the neutralization reaction tank, thereby greatly improving the mixing uniformity of the chemical reactants and wastewater and the reaction efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram showing the neutralization reaction vessel and its internal structure as described in this invention.

[0029] Figure 3 This is a schematic diagram of the disassembled structure of the motor and the rotating spindle of the present invention;

[0030] Figure 4 This is the invention Figure 3 Front view of the middle structure;

[0031] Figure 5 This is a schematic diagram showing the disassembled structure of the limiting ring and the limiting annular groove of the present invention;

[0032] Figure 6 This is a schematic diagram of the disassembled structure of the connecting rod and the rotating shaft of the present invention;

[0033] Figure 7 This is a schematic diagram of the disassembled structure of the fixing plate and the sliding rod of the present invention;

[0034] Figure 8 This is a schematic diagram of the cooperation structure between the guide plate and the rotating column of the present invention;

[0035] Figure 9 This is a cross-sectional structural diagram of the fixing plate of the present invention;

[0036] Figure 10 This is a schematic diagram of the disassembled structure of the slide bar and the fixing plate of the present invention.

[0037] Labeling Explanation: 1. Dosing Mechanism; 2. Neutralization Reaction Tank; 3. Adsorption Tank; 4. Disinfection Discharge Tank; 5. Arc-shaped Stirring Tube; 6. Limiting Ring Groove; 7. Limiting Ring; 8. Arc-shaped Rod; 9. Drainage Gap; 10. Fixing Plate; 11. Sliding Rod; 12. Extrusion Plate; 13. Extrusion Groove; 14. Motor; 15. Rotating Main Shaft; 16. Connecting Rod; 17. Guide Plate; 18. Clearance Groove; 19. Connecting Plate; 20. Rotating Column; 21. Pressing Inclined Surface; 22. Protruding Plate; 23. Movable Groove; 24. Sliding Plate; 25. Baffle Plate; 26. Toothed Plate; 27. Rotating Shaft; 28. Gear; 29. ​​Connecting Rod; 30. Limiting Sleeve; 31. Diffusion Guide Frame; 32. Injection Orifice. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0039] like Figure 1 Figure 10The diagram shows an embodiment of a wastewater treatment device for automotive urea production provided by the present invention, comprising: a multi-stage treatment system, including a neutralization reaction tank 2 with a dosing mechanism 1, multiple adsorption tanks 3 with high-efficiency activated carbon, and a disinfection discharge tank 4; an arc-shaped stirring tube 5 is rotatably connected inside the neutralization reaction tank 2; a limiting ring groove 6 is formed inside the arc-shaped stirring tube 5; a limiting ring 7 is movable inside the limiting ring groove 6; multiple arc-shaped rods 8 that move inside the arc-shaped stirring tube 5 are fixedly connected to the limiting ring 7; a drainage gap 9 is provided between two adjacent arc-shaped rods 8; a fixing plate 10 is fixedly connected to the arc-shaped stirring tube 5; a sliding rod 11 is slidably fitted inside the fixing plate 10; the sliding rod 11 drives the limiting ring 7 to rotate.

[0040] The total circumference of the multiple arc rods 8 is greater than the circumference of the arc stirring tube 5. Since the total length of the arc rods 8 is greater than the circumference of the tube wall, the arc rods 8 always maintain close contact or compression with the inner wall of the arc stirring tube 5 during the rotation process.

[0041] Inside the neutralization reaction vessel 2, a guide plate 17 with an inclined distribution is fixedly connected by a connecting rod 16. A clearance groove 18 for the rotating main shaft 15 to move through the center of the guide plate 17. Two connecting plates 19, located on the top and bottom surfaces of the guide plate 17 respectively, are fixedly connected to the top of the sliding rod 11. When the sliding rod 11 moves in a circular motion with the arc-shaped stirring tube 5, the two connecting plates 19 at its top slide along the top and bottom surfaces of the guide plate 17 respectively. Because the guide plate 17 is inclined, the connecting plates 19 will be forcibly raised or lowered during the circular motion due to changes in the height of the guide plate 17.

[0042] A rotating column 20 is rotatably connected to the connecting plate 19. The end of the rotating column 20 has a pressing inclined surface 21 that abuts against the guide plate 17. This pressing engagement effectively reduces frictional resistance during sliding, making the up-and-down reciprocating movement of the slide rod 11 smoother. Simultaneously, the rotating column 20 can rotate, adaptively adjusting the contact angle between the pressing inclined surface 21 and the guide plate 17, avoiding jamming or wear caused by hard friction, and improving the operational stability and service life of the mechanism.

[0043] The bottom of the slide rod 11 is equipped with a squeezing plate 12, and the bottom of the fixed plate 10 is equipped with a squeezing groove 13 for the reciprocating movement of the pressure plate, thereby squeezing the wastewater at the bottom of the neutralization reaction tank 2. The core of this device lies in the special stirring structure inside the neutralization reaction tank 2. An arc-shaped stirring tube 5 is rotatably connected inside the neutralization reaction tank 2, and a limiting ring groove 6 is opened on its inner side. A limiting ring 7 is movably installed in the limiting ring groove 6 and can move along its trajectory. Multiple arc-shaped rods 8 are fixedly connected to the limiting ring 7. These arc-shaped rods 8 move inside the arc-shaped stirring tube 5, and a drainage gap 9 is left between adjacent arc-shaped rods 8. A fixed plate 10 is fixed on the arc-shaped stirring tube 5, and a slide rod 11 is slidably fitted inside the fixed plate 10. When the slide rod 11 slides up and down, it will drive the limiting ring 7 to rotate. The bottom of the slide rod 11 is equipped with a squeezing plate 12, and the bottom of the fixed plate 10 is correspondingly equipped with a squeezing groove 13. The squeezing plate 12 reciprocates in the squeezing groove 13, thereby squeezing the wastewater at the bottom of the neutralization reaction tank 2.

[0044] The neutralization reaction vessel 2 in this application is fixedly connected to a motor 14. The output shaft of the motor 14 is fixedly connected to a rotating main shaft 15 that is connected and fixed to the arc-shaped stirring tube 5. After the motor 14 is started, the output shaft drives the rotating main shaft 15 to rotate, and the rotating main shaft 15 in turn drives the arc-shaped stirring tube 5 to rotate in the horizontal direction.

[0045] The slide rod 11 has a raised plate 22 in the middle, and the fixed plate 10 has a movable groove 23 on its side. The slide rod 11 is fixedly connected to a sliding plate 24, and multiple baffles 25 with different inclination angles are fixedly connected to the end of the sliding plate 24. When the slide rod 11 moves up and down, it drives the sliding plate 24 and the multiple baffles 25 with different inclination angles to move up and down synchronously, which further increases the turbulence and mixing effect of the wastewater in the vertical direction and enhances the uniformity of the neutralization reaction.

[0046] The slide rod 11 has a toothed plate 26 fixedly connected to the bottom end and connected to the extrusion plate 12. A rotating shaft 27 is rotatably connected to the fixed plate 10. One end of the rotating shaft 27 is fixedly connected to a gear 28 that meshes with the toothed plate 26. The other end of the rotating shaft 27 is fixedly connected to a connecting rod 29 between it and the limiting ring 7. When the slide rod 11 moves up and down, it drives the toothed plate 26 to move up and down synchronously. The toothed plate 26 drives the gear 28 to rotate. The gear 28 drives the rotating shaft 27 to rotate. The rotating shaft 27 then drives the limiting ring 7 to rotate along the limiting ring groove 6 through the connecting rod 29. A limiting sleeve 30 that rotates with the rotating shaft 27 is fixedly connected to the fixed plate 10. The rotating shaft 27 passes through the limiting sleeve 30 and can rotate freely.

[0047] The bottom of the fixed plate 10 is fixedly connected to a diffusion guide frame 31 that is wider at the bottom and narrower at the top. The diffusion guide frame 31 has a trumpet-shaped structure that is narrower at the top and wider at the bottom. When the extrusion plate 12 reciprocates within the extrusion groove 13, the wastewater is forced into the diffusion guide frame 31, generating a local jet and diffusion effect. This structure helps to diffuse the wastewater at the bottom of the neutralization reaction tank 2 more evenly to the surrounding area, preventing the accumulation of sediment at the bottom and further eliminating mixing dead zones.

[0048] The arc-shaped stirring tube 5 is provided with a spray hole 32, which cooperates with the drainage gap 9. When the limiting ring 7 drives the arc-shaped rod 8 to rotate inside the arc-shaped stirring tube 5, the arc-shaped rod 8 squeezes the wastewater inside the tube, causing the wastewater to be squeezed out from the end of the arc-shaped stirring tube 5 and from the spray hole 32. The cooperation between the spray hole 32 and the drainage gap 9 allows the wastewater to be sprayed out from multiple directions simultaneously, forming multiple jets, which greatly increases the contact area and mixing degree between the wastewater and the chemical reactants, and improves the efficiency of the neutralization reaction.

[0049] Working Principle: After the device is started, the required neutralization chemical reagents (such as acids or alkalis) are first quantitatively added to the wastewater in the neutralization reaction tank 2 through the dosing mechanism 1. Simultaneously, the motor 14, fixedly installed at the top of the neutralization reaction tank 2, is powered on and its output shaft drives the rotating main shaft 15 to rotate continuously. Since the rotating main shaft 15 is fixedly connected to the arc-shaped stirring tube 5, the arc-shaped stirring tube 5 rotates at a uniform speed in the horizontal direction. The arc-shaped stirring tube 5 acts as a support platform, and its fixed outer plate 10, movable inner limiting ring 7, and sliding rod 11 all move synchronously in the horizontal direction with the arc-shaped stirring tube 5. This basic rotation allows the main structure of the arc-shaped stirring tube 5, as well as its internal limiting ring 7 and arc-shaped rod 8, to directly act on the wastewater in the neutralization reaction tank 2, forming a preliminary macroscopic stirring flow field, promoting contact and mixing of the chemical reagents and wastewater over a large area.

[0050] More importantly, when the fixed plate 10 drives the slide rod 11 to rotate around the center of the neutralization reaction tank 2, the two connecting plates 19 at the top of the slide rod 11 and the rotating column 20 rotatably connected to them also move synchronously. Since the neutralization reaction tank 2 has an inclined guide plate 17 fixed inside by the connecting rod 16, and the two connecting plates 19 are located on the top and bottom surfaces of the guide plate 17 respectively, during the rotation of the slide rod 11, the pressure slope 21 at the end of the rotating column 20 will continuously press against the surface of the guide plate 17. Since the guide plate 17 is not horizontal, but has a specific tilt angle, the slide rod 11 is forced to slide back and forth relative to the fixed plate 10 while rotating with the fixed plate 10—when the rotating column 20 moves to the higher side of the guide plate 17, the slide rod 11 is lifted; when it moves to the lower side, the slide rod 11 moves down. The rotational capability of the rotating column 20 allows its pressing inclined surface 21 to adaptively conform to the surface of the guide plate 17, preventing jamming and ensuring smooth movement.

[0051] The reciprocating motion of the slide bar 11 has multiple driving effects. The toothed plate 26, which is fixedly connected to the bottom of the slide bar 11, moves up and down synchronously with the slide bar 11. The toothed plate 26 is engaged with the gear 28 mounted on the fixed plate 10. The linear reciprocating motion of the toothed plate 26 drives the gear 28 to rotate in both directions. The gear 28 is fixed to one end of the rotating shaft 27. The other end of the rotating shaft 27 is connected to the limiting ring 7 through the connecting rod 29. Therefore, the rotation of the gear 28 is transmitted to the limiting ring 7 through the rotating shaft 27 and the connecting rod 29, forcing the limiting ring 7 to rotate along the limiting ring groove 6 inside the arc-shaped stirring tube 5. Multiple arc-shaped rods 8 are fixedly connected to the limiting ring 7. These arc-shaped rods 8 are located in the internal cavity of the arc-shaped stirring tube 5. The rotation of the limiting ring 7 drives the arc-shaped rods 8 to make relative circular motion between the inner wall of the arc-shaped stirring tube 5 and the limiting ring 7. Because there is a drainage gap 9 between two adjacent arc-shaped rods 8, and a spray hole 32 is opened on the arc-shaped stirring tube 5, when the arc-shaped rods 8 rotate and squeeze the wastewater inside the arc-shaped stirring tube 5, the wastewater is forced to be squeezed out at high speed from both ends of the arc-shaped stirring tube 5, the drainage gap 9 between each arc-shaped rod 8, and the spray hole 32. The simultaneous action of multiple spray directions causes the wastewater to form multiple jets in the chamber, which greatly enhances the local turbulence, effectively breaks up any possible concentration stratification, and allows the reagent and wastewater to achieve full mixing at the microscale.

[0052] At the same time, the reciprocating motion of the slide bar 11 also drives the extrusion plate 12 at its bottom to reciprocate vertically within the extrusion groove 13 at the bottom of the fixed plate 10. The extrusion groove 13 is directly opposite the bottom area of ​​the neutralization reaction tank 2. Each downward press of the extrusion plate 12 applies direct extrusion force to the wastewater at the bottom of the tank, forcing the liquid at the bottom to flow upward and outward, thereby completely eliminating the bottom mixing dead zone that is difficult to reach by conventional stirring devices and preventing reactant deposition.

[0053] In addition, the protruding plate 22 in the middle of the slide rod 11 and the multiple baffles 25 with different inclination angles fixedly connected to the end of the sliding plate 24 also reciprocate up and down along the movable groove 23 on the side of the fixed plate 10 under the action of the slide rod 11. These baffles 25 with different angles generate shearing and disturbance of different directions and intensities on the surrounding wastewater during the lifting and lowering process, further increasing the complexity of the fluid microcirculation and the mixing efficiency.

Claims

1. A wastewater treatment device for the production process of automotive urea, comprising: A multi-stage treatment system, comprising a neutralization reaction tank (2) with a dosing mechanism (1), multiple adsorption tanks (3) with high-efficiency activated carbon, and a disinfection discharge tank (4), characterized in that: an arc-shaped stirring tube (5) is rotatably connected inside the neutralization reaction tank (2), a limiting ring groove (6) is opened on the inner side of the arc-shaped stirring tube (5), a limiting ring (7) is movable in the limiting ring groove (6), multiple arc-shaped rods (8) that move in the arc-shaped stirring tube (5) are fixedly connected to the limiting ring (7), and a drain gap (9) is provided between two adjacent arc-shaped rods (8); a fixing plate (10) is fixedly connected to the arc-shaped stirring tube (5), a sliding rod (11) is slidably fitted inside the fixing plate (10), and the sliding rod (11) drives the limiting ring (7) to rotate; The bottom of the slide bar (11) is provided with a squeezing plate (12), and the bottom of the fixed plate (10) is provided with a squeezing groove (13) for the pressure plate to move back and forth, thereby squeezing the wastewater at the bottom of the neutralization reaction tank (2).

2. The wastewater treatment device for the production process of automotive urea according to claim 1, characterized in that: The neutralization reaction vessel (2) is fixedly connected to a motor (14), and the output shaft of the motor (14) is fixedly connected to a rotating main shaft (15) that is connected and fixed to the arc-shaped stirring tube (5).

3. The wastewater treatment device for the production process of automotive urea according to claim 2, characterized in that: Inside the neutralization reaction vessel (2), a guide plate (17) is fixedly connected by a connecting rod (16) and is distributed at an inclination. A clearance groove (18) for the rotating spindle (15) to move is provided in the middle of the guide plate (17). Two connecting plates (19) located on the top and bottom surfaces of the guide plate (17) are fixedly connected to the top of the slide rod (11).

4. The wastewater treatment device for the production process of automotive urea according to claim 3, characterized in that: A rotating column (20) is rotatably connected to the connecting plate (19), and the end of the rotating column (20) is provided with a pressing inclined surface (21) that presses against the guide plate (17).

5. A wastewater treatment device for the production process of automotive urea according to claim 1, characterized in that: The slide bar (11) has a raised plate (22) in the middle, and the fixed plate (10) has a movable groove (23) on its side. The slide bar (11) is fixedly connected to a sliding plate (24), and the end of the sliding plate (24) is fixedly connected to multiple baffles (25) with different inclination angles.

6. A wastewater treatment device for the production process of automotive urea according to claim 1, characterized in that: The bottom end of the slide bar (11) is fixedly connected to a toothed plate (26) that is connected and fixed to the extrusion plate (12). A rotating shaft (27) is rotatably connected to the fixed plate (10). One end of the rotating shaft (27) is fixedly connected to a gear (28) that meshes with the toothed plate (26). The other end of the rotating shaft (27) is fixedly connected to a connecting rod (29) between it and the limiting ring (7).

7. A wastewater treatment device for the production process of automotive urea according to claim 6, characterized in that: A limiting sleeve (30) that rotates with the rotating shaft (27) is fixedly connected to the fixed plate (10).

8. A wastewater treatment device for the production process of automotive urea according to claim 1, characterized in that: The bottom of the fixed plate (10) is fixedly connected to a diffusion guide frame (31) that is wider at the bottom and narrower at the top.

9. A wastewater treatment device for the production process of automotive urea according to claim 1, characterized in that: The arc-shaped stirring tube (5) is provided with a spray hole (32), which is matched with the liquid discharge gap (9).

10. A wastewater treatment device for the production process of automotive urea according to claim 1, characterized in that: The total circumference of the multiple arc rods (8) is greater than the circumference of the arc stirring tube (5).

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