Desulfurization wastewater thallium removal device with pretreatment module

Abstract

The desulfurization wastewater thallium removal device comprises a pretreatment tank and a water outlet pipe, the water outlet pipe is fixedly installed at the position, close to the bottommost part, of the side face of the pretreatment tank, a feeding port is formed in the top of the pretreatment tank, and a support is fixedly installed at the position, located on the outer side of the feeding port, of the top of the pretreatment tank; a driving motor is fixedly mounted at the top of the bracket. The central stirring assembly is arranged to be matched with the multiple sets of side stirring assemblies, comprehensive and efficient stirring of a solution in the pretreatment tank is achieved, the central stirring assembly is directly driven by the driving motor and provides main stirring power, and the six sets of side stirring assemblies are distributed in an annular array and fill the free area in the tank body; the stirring device and the central stirring device are mutually staggered and synchronously run, so that the stirring coverage range is obviously expanded, a mixing dead zone is effectively eliminated, a medicament and wastewater can be quickly and uniformly dispersed, and the reaction efficiency and the pretreatment effect are improved.

Description

A thallium removal device for desulfurization wastewater with a pretreatment module Technical Field

[0001] This invention relates to the field of thallium removal technology for wastewater, and more particularly to a thallium removal device for desulfurization wastewater with a pretreatment module. Background Technology

[0002] Currently, in the treatment of desulfurization wastewater in industrial sectors such as coal-fired power plants, the thallium removal process typically adopts a combined device mode of "pretreatment + deep thallium removal". Common pretreatment modules often use simple tank mixing devices, whose main function is to prepare the preliminary chemical conditions for wastewater, such as pH adjustment, oxidant addition, and initial thallium removal reaction. The subsequent core unit for thallium removal is generally a mechanically stirred reaction tank. Therefore, one tank in the entire thallium removal device is the pretreatment device, and the other is the stirred reaction tank. By adding precipitants such as sulfides and iron salts into the tank and using a stirrer to mix the reagents with the wastewater, thallium-containing precipitates are generated to achieve thallium removal. This type of device has a relatively simple structure and is finally transported to a settling tank for flocculation and sedimentation treatment.

[0003] However, the existing mixing devices for the aforementioned treatment tanks have significant technical defects in actual operation, especially in the mixing stage, which severely restrict the efficiency and economic efficiency of thallium removal. Specifically, the simple mixing devices in the pretreatment stage often have insufficient mixing intensity or too short a residence time, resulting in the failure of the reagent and wastewater to achieve rapid and uniform dispersion, affecting the effect of the chemical reaction and creating unfavorable initial conditions for flocculation and sedimentation in subsequent thallium removal work. More importantly, the core thallium removal mixing tank usually uses conventional paddle agitators, and its flow field design is often not optimal. Insufficient mixing can easily create a mixing dead zone within the tank, preventing thallium ions, precipitants, and flocculants from fully contacting and completing mass transfer and reaction within a short time. This inadequate mixing directly leads to a slow chemical reaction rate, requiring a longer hydraulic residence time to ensure the reaction is completed. This not only increases the volume requirement and infrastructure investment of the reaction tank but also increases the risk of overdosing of reagents. In addition, uneven mixing in certain areas can also result in fine precipitate particles with poor settling performance, increasing the load on subsequent solid-liquid separation units and potentially causing fluctuations or exceedances in effluent thallium concentration.

[0004] Therefore, how to provide a thallium removal device for desulfurization wastewater with a pretreatment module is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One object of the present invention is to provide a thallium removal device for desulfurization wastewater with a pretreatment module, which solves the problems mentioned in the background art.

[0006] According to an embodiment of the present invention, a thallium removal device for desulfurization wastewater with a pretreatment module includes a pretreatment tank and an outlet pipe. The outlet pipe is fixedly installed on the side of the pretreatment tank near the bottom. An inlet is provided at the top of the pretreatment tank. A bracket is fixedly installed on the top of the pretreatment tank outside the inlet. A drive motor is fixedly installed on the top of the bracket. A coupling is fixedly installed on the output shaft of the drive motor. A central stirring assembly is fixedly installed at the bottom of the coupling. A height self-adjusting assembly is movably sleeved on the side of the central stirring assembly near the coupling. The top of the height self-adjusting assembly is fixedly installed on the top of the inner wall of the bracket. A side stirring assembly is movably installed on the top of the pretreatment tank between the bracket and the inlet. The side stirring assembly is offset from the central stirring assembly.

[0007] A side stirring assembly is movably installed on the top of the pretreatment tank between the support and the feed inlet, and the side stirring assembly is offset from the central stirring assembly.

[0008] The number of side stirring components is six, and the six sets of side stirring components are arranged in a ring array with the stirring shaft as the array center. Each set of side stirring components includes a transmission gear, a limiting plate, a side rotating shaft, and side stirring blades. The top of the pretreatment tank has a through hole between the support and the feed inlet. The side rotating shaft is movably connected inside the through hole. The bottom end of the side rotating shaft extends into the interior of the pretreatment tank, and the top end of the side rotating shaft extends above the pretreatment tank. There are two sets of limiting plates. The two sets of limiting plates are symmetrically fixedly installed on the top and bottom of the transmission gear. The transmission gear is fixedly installed on the top end of the side rotating shaft through the limiting plates. The side stirring blades are fixedly installed on the surface of the side rotating shaft located inside the pretreatment tank.

[0009] The central stirring assembly also includes a drive gear, which is movably sleeved on the surface of the stirring shaft near the coupling. The drive gear meshes with the transmission gear, and a limiting disc is movably engaged at the top and bottom of the drive gear to limit its movement.

[0010] The stirring shaft includes a main rod and a splined shaft. The splined shaft is fixedly installed on the top of the main rod. The top end of the splined shaft is fixedly connected to the bottom end of the coupling. The drive gear is movably sleeved on the surface of the splined shaft. The height self-adjusting assembly includes a fixed ring, an annular wave groove, a fixed rod, and a roller. The fixed ring is fixedly installed on the top of the inner wall of the bracket by bolts. The annular wave groove is opened on the inner wall of the fixed ring. The fixed rod is fixedly installed on the top of the drive gear. The roller is rotatably installed on the top of the fixed rod and is tumbled inside the annular wave groove.

[0011] There are two fixing rods, and each fixing rod corresponds to two rollers. The two fixing rods are arranged in a circular array on the top of the drive gear, and the two rollers are symmetrically rotated and installed on the top of the fixing rods. The two rollers are set at different heights and are movably connected inside the annular wave groove. One roller is movably connected to the bottom of the inner wall of the annular wave groove, and the other roller is movably connected to the top of the inner wall of the annular wave groove.

[0012] The rod assembly includes a mounting base, a rotating base, and a central stirring blade. The mounting base is fixedly installed on the surface of the main rod body, the rotating base is rotatably connected to the mounting base, and the central stirring blade is fixedly connected to the side of the rotating base. The number of central stirring blades is not less than two sets. A pull rod is rotatably connected to the bottom end of the drive assembly. The bottom end of the pull rod is offset from the side stirring blades and rotatably connected to the upper surface of the central stirring blade at the bottom position. A linkage rod is rotatably connected between the not less than two sets of central stirring blades. The linkage rod is parallel to the main rod body, and the not less than two sets of central stirring blades are parallel to each other. The not less than two sets of central stirring blades and the linkage rod form a parallelogram structure.

[0013] Each set of side stirring components includes one side rotating shaft, and the number of side stirring blades corresponding to each side rotating shaft is not less than two sets. Each set of side stirring blades and each set of central stirring blades includes four side stirring blades and four central stirring blades, respectively. The four side stirring blades and four central stirring blades are distributed in a ring array. The number and position of the linkage rods and pull rods match the number and position of the four central stirring blades.

[0014] A docking seat is fixedly installed at the bottom of the inner wall of the pretreatment tank. A conical sealing bearing is fixedly installed inside the docking seat. The bottom end of the main rod matches the shape of the inner wall of the conical sealing bearing and is movably connected to the inner wall of the conical sealing bearing. The side stirring blades and the central stirring blades are inclined like "fan blades".

[0015] The beneficial effects of this invention are as follows: By setting a central stirring component and multiple sets of side stirring components to cooperate with each other, this invention achieves comprehensive and efficient stirring of the solution in the pretreatment tank. The central stirring component is directly driven by a drive motor, providing the main stirring power. The six sets of side stirring components are distributed in a ring array, filling the empty area in the tank. They are staggered from the central stirring component and operate synchronously, significantly expanding the stirring coverage area, effectively eliminating mixing dead zones, enabling the reagents and wastewater to be dispersed quickly and evenly, and improving the reaction efficiency and pretreatment effect.

[0016] The design combines gear meshing transmission with a height self-adjusting component, enabling dynamic adaptive adjustment of the stirring zone. The drive gear is linked to the stirring shaft via a splined shaft, and a lifting mechanism consisting of an annular wave groove, rollers, and a fixed rod allows the drive gear and its meshing transmission gear to reciprocate axially. This motion is transmitted to the side stirring blades via the side rotating shaft, causing them to periodically change their height while rotating and stirring. This disturbs the solution at different depths, further avoiding localized uneven mixing and enhancing the mass transfer and reaction efficiency of the entire tank.

[0017] By coupling the lifting and lowering motion of the central stirring blade and the drive gear through the linkage rod and tie rod, the tilt angle of the central stirring blade is synchronously and adaptively adjusted. The reciprocating motion of the drive gear is transmitted to the uppermost central stirring blade through the tie rod, and with the help of the parallelogram structure formed by the linkage rod, all the central stirring blades swing around the rotating seat in a fan shape. This design allows the central stirring blade to periodically change its tilt angle and stirring position while rotating, which significantly increases the stirring range and fluid shearing effect in the central area, and further improves the mixing intensity and reaction rate.

[0018] The structural design of this invention achieves efficient linkage and compact layout of multiple stirring units. A main stirring shaft drives six sets of side stirring shafts simultaneously through a gear system, and the lifting motion is synchronously transmitted to the side stirring blades and the central stirring blade through mechanical linkage. This integrated design achieves multi-dimensional and multi-regional coordinated stirring with a single power source, which not only simplifies the transmission system and reduces energy consumption and equipment costs, but also ensures the synchronicity and coordination of the movement of all stirring components, resulting in a more uniform flow field distribution and a more stable mixing effect.

[0019] The inclined design of the stirring blades and the optimization of the bottom support structure significantly improve the fluid dynamics and operational stability of the mixing. Both the side and center stirring blades are inclined, similar to fan blades, generating a combined axial and radial shear force on the solution during rotation, forming an upper and lower pressure difference, which effectively promotes the circulation and rapid flow of the solution. At the same time, the bottom of the stirring shaft is movably connected to the docking seat through a tapered sealed bearing, providing reliable radial and axial support, ensuring the stable operation of the main shaft system under high-speed stirring, and reducing vibration and wear.

[0020] This invention improves the economy and treatment effect of the thallium removal pretreatment system by optimizing the stirring flow field and enhancing mixing efficiency. The efficient and dead-zone-free stirring system allows thallium ions, precipitants and flocculants to come into full and rapid contact, shortening the hydraulic residence time required for the reaction. This reduces the volume of the reaction tank and lowers infrastructure investment. At the same time, uniform mixing is conducive to the generation of precipitates with larger particles and good settling performance, reducing the load on the subsequent solid-liquid separation unit. Under the premise of ensuring stable effluent quality, it reduces the risk of excessive reagent addition and long-term operating costs. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 is a schematic diagram of the overall three-dimensional structure of a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0023] Figure 2 is a partial cross-sectional three-dimensional structural diagram of the pretreatment tank position in a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0024] Figure 3 is a three-dimensional structural schematic diagram of the side stirring assembly of a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0025] Figure 4 is a three-dimensional structural diagram of the central stirring component in a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0026] Figure 5 is an exploded three-dimensional structural diagram of the side stirring component in a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0027] Figure 6 is an exploded three-dimensional structural diagram of the central stirring component in a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0028] Figure 7 is an enlarged structural schematic diagram of point A in Figure 6 of a desulfurization wastewater thallium removal device with a pretreatment module proposed in this invention.

[0029] The attached diagram shows: 1. Pretreatment tank; 2. Outlet pipe; 3. Support frame; 4. Drive motor; 5. Coupling; 6. Central stirring assembly; 7. Height self-adjusting assembly; 8. Side stirring assembly; 9. Stirring shaft; 10. Rod assembly; 11. Transmission gear; 12. Limiting plate; 13. Side rotating shaft; 14. Side stirring blade; 15. Through hole; 16. Drive gear; 17. Main rod; 18. Splined shaft; 19. Fixing ring; 20. Annular wave groove; 21. Fixing rod; 22. Roller; 23. Mounting base; 24. Rotating base; 25. Central stirring blade; 26. Tie rod; 27. Linkage rod; 28. Connecting seat. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] Referring to Figures 1-7, Example 1 includes a pretreatment tank 1 and an outlet pipe 2. The outlet pipe 2 is fixedly installed on the side of the pretreatment tank 1 near the bottom. The top of the pretreatment tank 1 has a feed inlet with a large opening, as shown in Figure 1, to facilitate feeding. Four supports 3 are fixedly installed on the top of the pretreatment tank 1 outside the feed inlet, providing stable support. A drive motor 4, a geared motor, is fixedly installed on the top of the supports 3, allowing for free speed control. It is powered by an external municipal power supply system. The motor 4 has its own built-in switch for starting and stopping the drive motor 4. It is generally used by connecting to an external controller. The output shaft of the drive motor 4 is fixedly mounted with a coupling 5. A central stirring assembly 6 is fixedly mounted at the bottom of the coupling 5. The central stirring assembly 6 includes a stirring shaft 9 and a rod assembly 10. The stirring shaft 9 is fixedly mounted at the bottom of the coupling 5, and the rod assembly 10 is fixedly mounted on the side of the stirring shaft 9. The rod assembly 10 is a central stirring structure. The stirring shaft 9 is a single drive shaft structure, and the rod assembly 10 is arranged around the stirring shaft 9.

[0032] In practice, when the drive motor 4 starts, it drives the stirring shaft 9 to rotate through the coupling 5. The rotation of the stirring shaft 9 drives the rod assembly 10 to rotate, which quickly stirs the inside of the pretreatment tank 1.

[0033] Referring to Figures 1-7, in Example 2, a side stirring assembly 8 is movably installed on the top of the pretreatment tank 1 between the support 3 and the inlet. The side stirring assembly 8 is staggered from the central stirring assembly 6 to avoid mutual interference. There are six sets of side stirring assemblies 8, arranged in a circular array with the stirring shaft 9 as the array center. The six sets fill the empty space inside the pretreatment tank 1, and the multiple sets of stirring form a stable stirring area, improving the stirring effect. Each set of side stirring assembly 8 includes a transmission gear 11, a limiting disc 12, a side rotating shaft 13, and... The side stirring blade 14 is provided. A through hole 15 is provided at the top of the pretreatment tank 1 between the support 3 and the feed inlet. The side rotating shaft 13 is movably connected inside the through hole 15. The bottom end of the side rotating shaft 13 extends into the interior of the pretreatment tank 1 body, and the top end of the side rotating shaft 13 extends above the pretreatment tank 1 body. There are two sets of limiting discs 12. The two sets of limiting discs 12 are symmetrically fixedly installed at the top and bottom of the transmission gear 11. The transmission gear 11 is fixedly installed at the top end of the side rotating shaft 13 through the limiting discs 12. The side stirring blade 14 is fixedly installed on the surface of the side rotating shaft 13 located inside the pretreatment tank 1 body.

[0034] In specific implementation, a guide sleeve is fixedly installed inside the through hole 15, and the side rotating shaft 13 is rotatably connected inside the guide sleeve. Specifically, the transmission gear 11 rotates synchronously to drive the six sets of side rotating shafts 13 to rotate, the side rotating shafts 13 rotate to drive the stirring blades to rotate, and the side stirring blades 14 rotate to stir the solution inside the pretreatment tank 1.

[0035] The central stirring assembly 6 also includes a drive gear 16, which is movably sleeved on the surface of the stirring shaft 9 near the coupling 5. The drive gear 16 meshes with the transmission gear 11, and the limiting plate 12 is movably engaged at the top and bottom positions of the drive gear 16 to limit the drive gear 16.

[0036] In practice, the drive gear 16 rotates synchronously with the stirring shaft 9. The rotation of the drive gear 16 drives the transmission gear 11 that meshes with it to rotate, thereby achieving the purpose of efficient transmission. The limiting plate 12 is used to ensure that the drive gear 16 is always meshed with the transmission gear 11 during the movement, and is used to limit the drive gear 16.

[0037] Referring to Figures 1-7, in Example 3, a height self-adjusting component 7 is movably fitted onto the side of the central stirring assembly 6 near the coupling 5. This component 7 drives the drive gear 16 and transmission gear 11 to adjust vertically, thus changing the height of the side rotating shaft 13 and the side stirring blades 14 to achieve stirring of the solution in different areas. The top of the height self-adjusting component 7 is fixedly installed on the top of the inner wall of the bracket 3. The stirring shaft 9 includes a main rod 17 and a splined shaft 18, with the splined shaft 18 fixedly installed on the main rod 17. The top of the spline shaft 18 is fixedly connected to the bottom of the coupling 5. The drive gear 16 is movably sleeved on the surface of the spline shaft 18. The height self-adjusting assembly 7 includes a fixed ring 19, an annular wave groove 20, a fixed rod 21, and a roller 22. The fixed ring 19 is fixedly installed at the top of the inner wall of the bracket 3 by bolts. The annular wave groove 20 is opened on the inner wall of the fixed ring 19. The fixed rod 21 is fixedly installed at the top of the drive gear 16. The roller 22 is rotatably installed at the top of the fixed rod 21. The roller 22 is rolled inside the annular wave groove 20.

[0038] In specific implementation, the drive gear 16 is movably sleeved on the surface of the spline shaft 18. The rotation of the spline shaft 18 drives the drive gear 16 to rotate synchronously. Simultaneously, the drive gear 16 can move up and down on the surface of the spline shaft 18. The rotation of the drive gear 16 drives the fixed rod 21 to rotate, which in turn drives the roller 22 to move along the annular wave groove 20. Guided and limited by the annular wave groove 20, the annular wave groove 20 drives the roller 22 and the fixed rod 21 to reciprocate up and down. The fixed rod 21 then drives the drive gear 16 to reciprocate up and down along the spline shaft 18. The up-and-down movement of the drive gear 16 is limited by the limiting plate 12, thus driving the transmission gear 11 to reciprocate up and down. The reciprocating movement of the transmission gear 11, through the limiting plate 12, drives the side rotating shaft 13 and the side stirring blade 14 to reciprocate up and down, thereby changing the area stirred by the side stirring blade 14 and further improving the stirring effect.

[0039] There are two fixing rods 21, and each fixing rod 21 corresponds to two rollers 22. The two fixing rods 21 are arranged in a ring array on the top of the drive gear 16. The two rollers 22 are symmetrically rotated and installed on the top of the fixing rods 21. The two rollers 22 are set at different heights. Both rollers 22 are movably connected to the inside of the annular wave groove 20. One roller 22 is movably connected to the bottom of the inner wall of the annular wave groove 20, and the other roller 22 is movably connected to the top of the inner wall of the annular wave groove 20.

[0040] In practice, the purpose of the two rollers 22 is to avoid obstruction during the rolling process. The two rollers 22 are respectively located at the top and bottom of the inner wall of the annular wave groove 20, thus ensuring that the rollers 22 are in close contact with the inner wall of the annular wave groove 20, and also ensuring that the rollers 22 roll more smoothly and are less likely to be obstructed.

[0041] Referring to Figures 1-7, in Example 4, the rod assembly 10 includes a mounting base 23, a rotating base 24, and a central stirring blade 25. The mounting base 23 is fixedly mounted on the surface of the main rod 17, the rotating base 24 is rotatably connected to the mounting base 23, and the central stirring blade 25 is fixedly connected to the side of the rotating base 24. The number of central stirring blades 25 is not less than two sets. A pull rod 26 is rotatably connected to the bottom end of the drive assembly. The bottom end of the pull rod 26 is offset from the side stirring blades 14 and rotatably connected to the upper surface of the bottommost central stirring blade 25. A linkage rod 27 is rotatably connected between the not less than two sets of central stirring blades 25. The linkage rod 27 is parallel to the main rod 17, and the not less than two sets of central stirring blades 25 are parallel to each other. The not less than two sets of central stirring blades 25 and the linkage rod 27 form a parallelogram structure.

[0042] In practice, when the drive gear 16 moves up and down, it drives the central stirring blade 25 to move up and down through the rotating seat 24 via the pull rod 26. The central stirring blade 25 moves in a fan shape through the rotating seat 24. The fan-shaped up and down movement of the top central stirring blade 25 drives all the central stirring blades 25 to move up and down through the linkage rod 27, thereby further changing the stirring area of ​​the central stirring blade 25, increasing the stirring range of the central stirring blade 25, and greatly improving the stirring efficiency of the solution pretreatment.

[0043] Each set of side stirring components 8 includes one side rotating shaft 13. The number of side stirring blades 14 corresponding to each side rotating shaft 13 is not less than two sets. Each set of side stirring blades 14 and each set of central stirring blades 25 includes four side stirring blades 14 and four central stirring blades 25, respectively. The four side stirring blades 14 and four central stirring blades 25 are arranged in a ring array. The number and position of the linkage rod 27 and the pull rod 26 are matched with the number and position of the four central stirring blades 25.

[0044] In practice, the design of four units, arranged in a ring array, improves the stability of stirring.

[0045] Referring to Figures 1-7, in Example 5, a docking seat 28 is fixedly installed at the bottom of the inner wall of the pretreatment tank 1. A conical sealing bearing is fixedly installed inside the docking seat 28. The bottom end of the main rod 17 matches the shape of the inner wall of the conical sealing bearing and is movably connected to the inner wall of the conical sealing bearing. The side stirring blades 14 and the central stirring blade are inclined like "fan blades".

[0046] In practice, the bottom end of the main rod 17 is connected to the top inner wall of the conical sealed bearing. The rotation of the main rod 17 is stable through the conical sealed bearing, which also provides support. This ensures the stability of the main rod 17 during stirring. The side stirring blades 14 and the center stirring blades are inclined like "fan blades" to shear the solution, creating different pressures at the top and bottom of the solution, further agitating the solution to flow rapidly and improve the mixing effect.

[0047] A ring-shaped pipe is fixedly installed on the top of the pretreatment tank 1. Six feed pipes are arranged in a ring array on the inner wall of the ring-shaped pipe. The end faces of the six feed pipes extend from the feed inlet into the interior of the pretreatment tank 1. A main connecting pipe is fixedly installed on the surface of the ring-shaped pipe. This pipe is designed to introduce some reactants. The purpose of the ring array distribution is to ensure uniform feeding.

[0048] The working principle of this invention is as follows: After the drive motor 4 starts, it drives the stirring shaft and its splined shaft 18 to rotate through the coupling 5. The splined shaft 18 directly drives the main rod 17 and mounting base 23 of the central stirring assembly 6 to rotate, causing the central stirring blade 25 to rotate around the shaft for basic stirring. On the other hand, the splined shaft 18 drives the movable drive gear 16 to rotate synchronously through the splines on its surface. The drive gear 16, through meshing with the six transmission gears 11, drives all the side rotating shafts 13 and their side stirring blades 14 to rotate synchronously, thereby achieving synchronous central and lateral stirring. At the same time, the fixed rod 21 fixed to the top of the drive gear 16 rotates with the drive gear 16, and the roller 22 at its top rolls along the annular wave groove 20 on the inner wall of the fixed ring 19. Under the guidance of the undulation of the wave groove, the drive gear 16 together with the fixed rod 21 moves up and down along the splined shaft 18. This lifting and lowering motion is controlled by the limiting plate 1. 2. The motion is transmitted to the meshing transmission gear 11, which in turn drives all the side rotating shafts 13 and side stirring blades 14 to move up and down while rotating, so as to stir different liquid layers. In addition, the lifting motion of the drive gear 16 is transmitted to the uppermost central stirring blade 25 through the pull rod 26 connected to its bottom end, forcing the central stirring blade 25 to swing in a fan shape with the rotating seat 24 as the fulcrum. This swing is then transmitted to all the central stirring blades 25 through the parallelogram structure composed of linkage rods 27, so that they synchronously change their tilt angle and stirring position. Finally, under the synergistic action of the rotating main shaft, gear transmission system, wave groove lifting mechanism and linkage mechanism, the central stirring blade 25 and multiple sets of side stirring blades 14 simultaneously realize the composite motion of rotation, lifting and angular swing, forming a violent and dead zone-free three-dimensional turbulence in the pretreatment tank 1, so that the wastewater and the reagent can be mixed quickly and evenly, which greatly improves the reaction efficiency and pretreatment effect.

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

Claims

1. A thallium removal device for desulfurization wastewater with a pretreatment module, characterized in that, The device includes a pretreatment tank (1) and an outlet pipe (2). The outlet pipe (2) is fixedly installed on the side of the pretreatment tank (1) near the bottom. The top of the pretreatment tank (1) has a feed inlet. A bracket (3) is fixedly installed on the top of the pretreatment tank (1) outside the feed inlet. A drive motor (4) is fixedly installed on the top of the bracket (3). A coupling (5) is fixedly installed on the output shaft of the drive motor (4). A central stirring assembly (6) is fixedly installed at the bottom of the coupling (5). A height self-adjusting assembly (7) is movably sleeved on the side of the central stirring assembly (6) near the coupling (5). The top of the height self-adjusting assembly (7) is fixedly installed on the top of the inner wall of the bracket (3). A side stirring assembly (8) is movably installed on the top of the pretreatment tank (1) between the bracket (3) and the feed inlet. The side stirring assembly (8) is offset from the central stirring assembly (6).

2. The thallium removal device for desulfurization wastewater with a pretreatment module according to claim 1, characterized in that, The central stirring assembly (6) includes a stirring shaft (9) and a rod assembly (10). The stirring shaft (9) is fixedly installed at the bottom of the coupling (5), and the rod assembly (10) is fixedly installed on the side of the stirring shaft (9).

3. The thallium removal device for desulfurization wastewater with a pretreatment module according to claim 2, characterized in that, The number of the side stirring components (8) is six sets. The six sets of side stirring components (8) are arranged in a ring array with the stirring shaft (9) as the array center. Each set of side stirring components (8) includes a transmission gear (11), a limiting disk (12), a side rotating shaft (13), and a side stirring blade (14). The top of the pretreatment tank (1) is provided with a through hole (15) between the support (3) and the feed inlet. The side rotating shaft (13) is movably connected inside the through hole (15). The bottom end extends into the interior of the pretreatment tank (1) body, the top end of the side rotating shaft (13) extends to the top of the pretreatment tank (1) body, there are two sets of limiting discs (12), the two sets of limiting discs (12) are symmetrically fixedly installed on the top and bottom of the transmission gear (11), the transmission gear (11) is fixedly installed on the top end of the side rotating shaft (13) through the limiting discs (12), and the side stirring blades (14) are fixedly installed on the surface inside the pretreatment tank (1) body on the side rotating shaft (13).

4. The thallium removal device for desulfurization wastewater with a pretreatment module according to claim 3, characterized in that, The central stirring assembly (6) also includes a drive gear (16), which is movably sleeved on the surface of the stirring shaft (9) near the coupling (5). The drive gear (16) meshes with the transmission gear (11), and the limiting plate (12) is movably engaged at the top and bottom positions of the drive gear (16) to limit the drive gear (16).

5. A thallium removal device for desulfurization wastewater with a pretreatment module according to claim 4, characterized in that, The stirring shaft (9) includes a main rod (17) and a spline shaft (18). The spline shaft (18) is fixedly installed on the top of the main rod (17). The top end of the spline shaft (18) is fixedly connected to the bottom end of the coupling (5). The drive gear (16) is movably sleeved on the surface of the spline shaft (18). The height self-adjusting assembly (7) includes a fixed ring (19), an annular wave groove (20), a fixed rod (21), and a roller (22). The fixed ring (19) is fixedly installed on the top of the inner wall of the bracket (3) by bolts. The annular wave groove (20) is opened on the inner wall of the fixed ring (19). The fixed rod (21) is fixedly installed on the top of the drive gear (16). The roller (22) is rotatably installed on the top of the fixed rod (21). The roller (22) is tumbled inside the annular wave groove (20).

6. A thallium removal device for desulfurization wastewater with a pretreatment module according to claim 5, characterized in that, There are two fixed rods (21), and each fixed rod (21) corresponds to two rollers (22). The two fixed rods (21) are arranged in a ring array on the top of the drive gear (16). The two rollers (22) are symmetrically rotated and installed on the top of the fixed rods (21). The two rollers (22) are set at different heights. Both rollers (22) are movably connected to the inside of the annular wave groove (20). One roller (22) is movably connected to the bottom of the inner wall of the annular wave groove (20), and the other roller (22) is movably connected to the top of the inner wall of the annular wave groove (20).

7. A thallium removal device for desulfurization wastewater with a pretreatment module according to claim 6, characterized in that, The rod assembly (10) includes a mounting base (23), a rotating base (24), and a central stirring blade (25). The mounting base (23) is fixedly mounted on the surface of the main rod (17). The rotating base (24) is rotatably connected to the mounting base (23). The central stirring blade (25) is fixedly connected to the side of the rotating base (24). The number of central stirring blades (25) is not less than two sets. The bottom end of the drive assembly is rotatably connected to a pull rod (26). The bottom end of the pull rod (26) is offset from the side stirring blade (14) and rotatably connected to the upper surface of the central stirring blade (25) at the bottom position. The central stirring blades (25) are rotatably connected to the two sets of central stirring blades (25). The linkage rod (27) is parallel to the main rod (17). The central stirring blades (25) are parallel to each other. The central stirring blades (25) and the linkage rod (27) form a parallelogram structure.

8. A thallium removal device for desulfurization wastewater with a pretreatment module according to claim 7, characterized in that, Each set of side stirring components (8) includes a side rotating shaft (13), and the number of side stirring blades (14) corresponding to each side rotating shaft (13) is not less than two sets. Each set of side stirring blades (14) and each set of center stirring blades (25) includes four side stirring blades (14) and four center stirring blades (25), respectively. The four side stirring blades (14) and four center stirring blades (25) are distributed in a ring array. The number and position of the linkage rod (27) and the pull rod (26) match the number and position of the four center stirring blades (25).

9. A thallium removal device for desulfurization wastewater with a pretreatment module according to claim 8, characterized in that, The bottom of the inner wall of the pretreatment tank (1) is fixedly installed with a docking seat (28), and a conical sealing bearing is fixedly installed inside the docking seat (28). The bottom end of the main rod (17) matches the shape of the inner wall of the conical sealing bearing and the bottom end of the main rod (17) is movably connected to the inner wall of the conical sealing bearing. The side stirring blades (14) and the central stirring blades are inclined like "fan blades".

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