A wastewater recovery device for producing a papermaking aid AKD crude powder

Abstract

This invention discloses a wastewater recovery device for the production of AKD raw powder, a papermaking additive, specifically relating to the field of wastewater treatment technology. It includes a reaction cylinder, a settling cylinder, and a heating separation cylinder. One end of the reaction cylinder is equipped with an inlet pipe communicating with its interior. A filter screen is connected between the reaction cylinder and the settling cylinder. A central reaction assembly is installed inside the reaction cylinder, which is used to achieve diversion and coordinated treatment of wastewater inside the reaction cylinder, while simultaneously stabilizing the settling of wastewater contained inside the settling cylinder. This invention constructs a progressively energy-dissipating hydraulic structure through a multi-layered, staggered arrangement of flow-dissipating frames. The upper flow-dissipating frame dissipates the concentrated impact kinetic energy of newly entering wastewater, the middle flow-dissipating frame completes secondary homogenization of the water flow, and the lower flow-dissipating frame achieves effluent rectification, resulting in a stepped decrease in wastewater flow velocity. This completely solves the problems of turbulent flow and uncontrollable mixing caused by traditional direct water intake methods.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a wastewater recovery device for the production of AKD raw powder, a papermaking additive. Background Technology

[0002] Alkyl ketene dimer (AKD) is a high-performance reactive neutral sizing agent widely used in the paper industry. During its industrial production, a large amount of acidic wastewater is generated, mainly containing triethylamine hydrochloride, residual AKD, fatty acids, and other pollutants. Direct discharge would cause serious environmental pollution, and the recoverable components in the wastewater would also be wasted. To achieve harmless treatment and resource recovery of this type of wastewater, the industry generally adopts a comprehensive treatment process of "neutralization treatment—cooling transformation—solid-liquid separation" to complete wastewater purification and recovery of valuable components. In this process, the neutralization cylinder is the first core treatment unit for wastewater entering the treatment system, combining multiple functions such as wastewater collection, acid-base neutralization reaction, and preliminary sedimentation separation. The rationality of its structural design directly determines the completion of the neutralization reaction, thus affecting the operational stability, treatment efficiency, and final treatment effect of the entire treatment system. Currently, in the deep treatment of AKD raw powder production wastewater, the neutralization cylinder, as the core unit for wastewater collection and pretreatment, directly affects the subsequent sedimentation and separation effects due to its internal hydraulic state. Existing neutralization cylinders mostly employ a water distribution method where the inlet pipe extends directly into the cylinder. Wastewater is injected directly into the cylinder through the inlet pipe, mixes and reacts with the neutralizing agent added inside, and then flows into the subsequent sedimentation unit after being filtered through the internal filter screen. Under this water distribution method, the mixing of newly introduced wastewater with the existing wastewater and neutralizing agent in the cylinder relies solely on the turbulent diffusion generated by the inlet jet. The mixing process is violent and the flow pattern is uncontrollable, making it impossible to form a stable and orderly reaction flow field. This easily leads to some newly introduced wastewater not fully contacting the neutralizing agent and completing the neutralization reaction before being pushed to the filter screen outlet and flowing out of the cylinder by the continuously entering wastewater. This results in insufficient neutralization, and the incompletely reacted wastewater cannot achieve preliminary flocculation and sedimentation of suspended solids, leading to an increase in the suspended solids content entering subsequent units. This increases the treatment effect of the cooling transformation and solid-liquid separation stages, reducing the overall treatment efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a wastewater recovery device for the production of AKD raw powder, a papermaking additive, to address the aforementioned shortcomings in the technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a wastewater recycling device for the production of AKD raw powder, a papermaking additive, comprising a reaction cylinder, a settling cylinder, and a heating separation cylinder. One end of the reaction cylinder is equipped with a water inlet pipe communicating with its interior. A filter screen is connected between the reaction cylinder and the settling cylinder. The interior of the reaction cylinder is provided with a medium-reaction component, which is used to achieve the diversion and coordinated treatment of wastewater inside the reaction cylinder, and at the same time to complete the stable settling operation of the wastewater contained inside the settling cylinder. The intermediate reaction assembly includes an intermediate reaction cavity housed inside the reaction cylinder and several baffles movably connected inside the intermediate reaction cavity, and the shape of each baffle is different. A hair separating and cleaning frame is movably connected to the side of the intermediate reaction cavity near the filter screen, and the hair separating and cleaning frame moves horizontally along one side of the filter screen. A power assembly is installed outside the reaction cylinder, and the power assembly is used to drive the several baffles to rotate synchronously. A side disturbance assembly is provided between the reaction cylinder and the settling cylinder to drive the hair separation and cleaning frame to move up and down and left and right. One of the aforementioned spoiler frames is provided with a self-cleaning component between it and the hair-separating and cleaning frame, and the self-cleaning component is used to perform coarse cleaning on the hair-separating and cleaning frame; An oblique cutting component is provided between the settling cylinder and the filter screen, and the oblique cutting component guides and slows the flow of wastewater inside the settling cylinder in an oblique manner.

[0005] Preferably, the power assembly includes two connecting discs rotatably connected inside the central reaction cavity, and one end of each connecting disc is fixedly connected to a side arm, and one end of the side arm is fixedly connected to one side of the spoiler frame; The lengths of each pair of side arms are different from each other, and the spoiler frame forms a gradient rotation inside the central cavity through the side arms; The reaction cylinder is externally fixedly connected to a first servo motor, and the output end of the first servo motor is fixedly connected to a connecting shaft. One end of the connecting shaft extends into the interior of the reaction cylinder and the intermediate reaction cavity and is fixedly connected to one of the connecting plates.

[0006] Preferably, the side disturbance assembly includes a guide groove formed between the reaction cylinder and the settling cylinder and a centering frame fixedly connected to the top of the filter screen, and the centering frame is located inside the guide groove. An L-shaped groove is formed on one side of the centering frame, and a connecting column is fixedly connected to the top of the hair separation and cleaning frame, and the connecting column is located inside the L-shaped groove. The top of the reaction cylinder is fixedly connected to a telescopic cylinder, and the telescopic end of the telescopic cylinder is fixedly connected to a support plate. The support plate is slidably connected inside the guide groove. One side of the support plate is provided with an extrusion groove for inserting a connecting column, and the connecting column achieves multi-dimensional movement along the inside of the L-shaped groove through the support plate.

[0007] Preferably, the self-cleaning assembly includes a receiving frame fixedly connected to the side of the intermediate reaction cavity near the filter screen. The receiving frame has a limiting groove on its outside. A slide is slidably connected inside the limiting groove. A self-cleaning roller is fixedly connected to the side of the slide near the filter screen. The outside of the self-cleaning roller is in contact with one side of the hair separation and cleaning frame. An arc lifting block is installed on the outside of the receiving frame to cooperate with one of the baffle frames. The arc lifting block is designed with an arc shape.

[0008] Preferably, a return spring is fixedly connected inside the center-limiting groove, and a center-limiting slide rod is fixedly connected to the end of the return spring away from the center-limiting groove. One end of the arc lifting block extends into the interior of the center-limiting groove and is fixedly connected to one side of the center-limiting slide rod. The center-limiting slide bar is fixedly connected to one side of the slide frame on the side away from the arc lifting block, and the slide frame reciprocates along the outside of the receiving frame through the center-limiting slide bar.

[0009] Preferably, the oblique cutting component includes a stabilizing frame fixedly connected inside the settling cylinder and a second servo motor fixedly connected to the top of the stabilizing frame. The drive end of the second servo motor extends into the interior of the settling cylinder and is fixedly connected to a traction plate. One end of the traction plate is obliquely fixedly connected to an inclined cone plate. A guide column is installed inside the inclined cone plate, and a restraining cylinder is fixedly sleeved on the outside of the guide column. The bottom end of the restraining cylinder is fixedly connected to a concentric disk, and the outside of the concentric disk is fixedly connected to several oblique slices, which are designed as inclined arc-shaped structures. The internal stabilizing frame is movably connected to a concentric frame, which is sleeved on the outside of the restraining cylinder. The restraining cylinder and the concentric frame are connected by a torsion assembly, which is used to drive the concentric frame to swing up and down along the inside of the stabilizing frame.

[0010] Preferably, the torsion assembly includes two concentric columns installed outside the restraining cylinder, and the interior of the concentric frame is provided with two concentric holes for the two concentric columns to be inserted, and there is a floating gap between the concentric columns and the concentric holes.

[0011] Preferably, two torsion columns are fixed to the outside of the concentric frame, and two torsion holes are opened on the outside of the connecting frame for the two torsion columns to be inserted. One end of one of the torsion columns is fixedly connected to a filter disc, and the filter disc reciprocates along one end of the filter screen through the torsion column.

[0012] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. This invention constructs a hydraulic structure for energy dissipation through a multi-layered, staggered arrangement of baffles. The upper baffle dissipates the concentrated impact energy of the incoming wastewater, the middle baffle completes secondary homogenization of the water flow, and the lower baffle achieves effluent rectification, resulting in a stepwise decrease in wastewater velocity. This completely solves the problems of turbulent and uncontrollable mixing caused by traditional direct influent methods. At the same time, through the design of an alternating laminar and turbulent flow field, the incoming wastewater forms a gentle tangential gradient mixing with the existing wastewater and neutralizing agent in the cylinder. This ensures sufficient contact between the wastewater and the neutralizing agent, eliminates short-circuiting in the neutralization reaction, avoids large fluctuations in the effluent pH value, and does not cause severe disturbance to the settled suspended solids. This effectively reduces the processing load of subsequent cooling transformation and solid-liquid separation processes, laying the foundation for the stable operation of the entire wastewater recycling and treatment process. 2. This invention utilizes the pre-rectification effect of the flow-dispersing frame to allow wastewater to enter the filter area at a stable and low flow rate, significantly reducing the instantaneous flow impact and local hydraulic load on the filter, and decreasing the probability of suspended solids deposition on the filter surface. Simultaneously, through the cooperation of the telescopic cylinder, support plate, and L-shaped groove, the hair-separating cleaning frame is driven to form a two-dimensional composite cleaning trajectory covering the entire filter surface. Compared with traditional one-dimensional linear cleaning, this achieves thorough cleaning of the filter surface without dead angles, and can scrape off the filter cake layer and attached impurities on the surface of the filter holes in real time, eliminating dead zones in the water flow of the filtration area, effectively preventing filter hole blockage, ensuring the long-term stability of the filter flux, and significantly extending the effective working cycle of the filter. 3. This invention utilizes the existing rotational motion of the baffle frame, through its intermittent contact with the arc lifting block, to drive the slide and self-cleaning roller to achieve reciprocating lifting and lowering. This eliminates the need for an additional independent drive source, enabling online self-cleaning of the hair separating and cleaning frame, simplifying the equipment structure, reducing the complexity of the control system, and lowering equipment manufacturing costs. Through the staggered scraping action of the self-cleaning roller and the hair separating and cleaning frame, suspended matter and fibrous impurities adhering to the surface of the frame can be removed in real time, preventing cleaning failures caused by impurities and ensuring the frame remains clean. This maintains the frame's ability to clean the filter screen over a long period, guaranteeing the reliability of continuous operation of the filter unit. 4. This invention uses a second servo motor to drive the concentric frame to reciprocate and tilt, thereby causing the oblique slices to actively reconstruct the flow field in the settling cylinder in three dimensions. This promotes the wastewater to form a controllable flow state with uniform circumferential mixing, vertical circulation and exchange, and tangential micro-vortex dispersion, eliminating local deviations in water concentration and suspended solids distribution within the settling cylinder. At the same time, the disturbance intensity is controlled within a moderate range, which maintains the suspension state of small-diameter suspended solids through micro-vortices, preventing them from settling too quickly and causing blockage and caking at the bottom of the cylinder, while not hindering the normal gravity settling of large-diameter suspended solids, thus achieving particle size classification and control of suspended solids. 5. This invention achieves full-process synergy through front-end neutralization and mixing, mid-stage filtration and cleaning, and rear-end sedimentation and separation with heating: the homogenizing and mixing effect of the front-end baffle ensures the sufficiency of the neutralization reaction and provides stable water quality for the filtration unit; the slow-flow cleaning mechanism of the filtration unit ensures the stability of the suspended solids content in the effluent and provides stable water inlet conditions for the sedimentation unit; the flow field reconstruction effect of the sedimentation unit precisely controls the particle size distribution and water quality uniformity of the effluent, creating homogeneous and stable water inlet conditions for the subsequent heating separation cylinder. This effectively solves the problems of large fluctuations in treatment load and low separation efficiency caused by independent operation of each process and mismatch of hydraulic conditions in traditional processes, and significantly improves the operational stability, treatment efficiency, and resource recovery effect of the entire process of AKD production wastewater treatment. 6. This invention utilizes a rotating structure supported by double connecting discs on the spoiler frame, improving the coaxiality and stability of the rotation process and avoiding swaying and vibration during long-term operation; the self-cleaning mechanism employs a guide cooperation between a center-limiting slide rod and a center-limiting groove, ensuring the accuracy of lifting and lowering movements and preventing jamming; the settling unit adopts a cooperative structure of a connecting and stabilizing frame and a concentric frame, ensuring the stability of the reciprocating swing process and preventing motion interference; the overall structure is compact, the transmission path is clear, and the coordination between various moving parts is precise, significantly improving the stability and reliability of the equipment during long-term continuous operation. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the spoiler frame of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of section A in the image; Figure 4 This is a schematic diagram of the assembly of the filter disc and filter screen of the present invention; Figure 5 This is an exploded view of the side disturbance component of the present invention; Figure 6 This is a schematic diagram of the structure of the reset spring of the present invention; Figure 7 This is a schematic diagram of the first motion state structure of the traction cylinder of the present invention; Figure 8 This is a schematic diagram of the second motion state of the restraining cylinder of the present invention; Figure 9 This is a schematic diagram of the third motion state of the restraining cylinder of the present invention; Figure 10 This is a schematic diagram of the fourth motion state of the restraining cylinder of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Reaction cylinder; 11. Water inlet pipe; 12. Sedimentation cylinder; 13. Heating and separation cylinder; 14. Filter screen; 2. Mid-mounted anti-reflection assembly; 21. Mid-mounted anti-reflection cavity; 22. Connecting plate; 23. Spoiler frame; 24. Side arm; 25. Connecting shaft column; 26. First servo motor; 27. Hair separation and cleaning frame; 3. Side disturbance assembly; 31. Telescopic cylinder; 32. Support plate; 33. Extrusion groove; 34. Centering frame; 35. Connecting column; 36. L-shaped groove; 37. Guide groove; 4. Self-cleaning assembly; 41. Receiving frame; 42. Slide carriage; 43. Self-cleaning roller; 44. Center limiting groove; 45. Center limiting slide rod; 46. Arc lifting block; 47. Return spring; 5. Angled cutting assembly; 51. Second servo motor; 52. Connecting and stabilizing frame; 53. Traction plate; 54. Angled cone plate; 55. Guide column; 56. Traction cylinder; 57. Concentric hole; 58. Concentric column; 59. Concentric frame; 501. Concentric disc; 502. Angled slice; 503. Torsion column; 504. Torsion hole; 505. Filter disc. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] This invention provides, for example Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The wastewater recovery device for the production of AKD raw powder, a papermaking additive, is shown. It includes a reaction cylinder 1, a settling cylinder 12, and a heating separation cylinder 13. One end of the reaction cylinder 1 is equipped with a water inlet pipe 11 that communicates with its interior. A filter screen 14 is connected between the reaction cylinder 1 and the settling cylinder 12. The reaction cylinder 1 is equipped with a medium-reaction component 2, which is used to achieve the diversion and coordinated treatment of wastewater inside the reaction cylinder 1, and at the same time to complete the stable settling operation of the wastewater contained in the settling cylinder 12. The intermediate reaction assembly 2 includes an intermediate reaction cavity 21 housed inside the reaction cylinder 1 and several baffles 23 movably connected inside the intermediate reaction cavity 21. Each baffle 23 has a different shape. A hair separating and cleaning frame 27 is movably connected to the side of the intermediate reaction cavity 21 near the filter screen 14. The hair separating and cleaning frame 27 moves horizontally along one side of the filter screen 14. A power assembly is installed outside the reaction cylinder 1. The power assembly is used to drive the several baffles 23 to rotate synchronously. The power assembly includes two connecting plates 22 rotatably connected inside the intermediate reaction cavity 21. One end of each connecting plate 22 is fixedly connected to a side arm 24, and one end of the side arm 24 is fixedly connected to one side of the baffle 23. The lengths of each pair of side arms 24 are different from each other, and the spoiler 23 forms a gradient rotation inside the central anti-reflection cavity 21 through the side arms 24; A first servo motor 26 is fixedly connected to the outside of the reaction cylinder 1, and a connecting shaft 25 is fixedly connected to the output end of the first servo motor 26. One end of the connecting shaft 25 extends into the interior of the reaction cylinder 1 and the intermediate reaction cavity 21 and is fixedly connected to one of the connecting plates 22. A side disturbance component 3 is provided between the reaction cylinder 1 and the settling cylinder 12 to drive the hair separation and cleaning frame 27 to move up and down and left and right. The side disturbance component 3 includes a guide groove 37 opened between the reaction cylinder 1 and the settling cylinder 12 and a centering frame 34 fixedly connected to the top of the filter screen 14. The centering frame 34 is located inside the guide groove 37. An L-shaped groove 36 is opened on one side of the centering frame 34. A connecting column 35 is fixedly connected to the top of the hair separation and cleaning frame 27. The connecting column 35 is located inside the L-shaped groove 36. A telescopic cylinder 31 is fixedly connected to the top of the reaction cylinder 1, and a support plate 32 is fixedly connected to the telescopic end of the telescopic cylinder 31. The support plate 32 is slidably connected inside the guide groove 37. A pressing groove 33 for inserting the connecting column 35 is opened on one side of the support plate 32, and the connecting column 35 achieves multi-dimensional movement along the inside of the L-shaped groove 36 through the support plate 32. There are four spoiler frames 23, each with a different configuration, namely an arc shape, an arch shape, a curved bridge shape, and a rake-tooth shape. At the same time, the number of side arms 24 is matched with the number of spoiler frames 23. Each spoiler frame 23 has two side arms 24 on its outer side, and the two side arms 24 on the same spoiler frame 23 have different lengths. This allows each spoiler frame 23 to be arranged in a staggered, stepped manner inside the central anti-reflection cavity 21 under the support of the corresponding side arms 24. The specific structures and principles of the reaction cylinder 1, settling cylinder 12, and heating separation cylinder 13 are all existing technologies, and therefore are not described in detail in this application.

[0018] refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a self-cleaning component 4 is provided between one of the baffle frames 23 and the hair-separating cleaning frame 27. The self-cleaning component 4 is used to perform coarse cleaning on the hair-separating cleaning frame 27. The self-cleaning component 4 includes a receiving frame 41 fixedly connected to the side of the intermediate reaction cavity 21 near the filter screen 14. A center groove 44 is opened on the outside of the receiving frame 41. A slide 42 is slidably connected inside the center groove 44. A self-cleaning roller 43 is fixedly connected to the side of the slide 42 near the filter screen 14. The outside of the self-cleaning roller 43 is in contact with one side of the hair-separating cleaning frame 27. An arc lifting block 46 that cooperates with one of the baffle frames 23 is installed on the outside of the receiving frame 41. The arc lifting block 46 is set as an arc structure. A return spring 47 is also fixedly connected inside the center groove 44. A center sliding rod 45 is fixedly connected to the end of the return spring 47 away from the center groove 44. One end of the arc lifting block 46 extends into the inside of the center groove 44 and is fixedly connected to one side of the center sliding rod 45. The side of the center-limiting slide bar 45 away from the arc lifting block 46 is fixedly connected to one side of the slide 42, and the slide 42 reciprocates along the outside of the receiving frame 41 through the center-limiting slide bar 45.

[0019] refer to Figure 4 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, a slanted cutting component 5 is provided between the settling cylinder 12 and the filter screen 14. The slanted cutting component 5 guides and slows the flow of wastewater inside the settling cylinder 12 in a slanted manner. The slanted cutting component 5 includes a connecting frame 52 fixedly connected inside the settling cylinder 12 and a second servo motor 51 fixedly connected to the top of the connecting frame 52. The drive end of the second servo motor 51 extends into the interior of the settling cylinder 12 and is fixedly connected to a traction plate 53. One end of the traction plate 53 is fixedly connected to a slanted cone plate 54. A guide post 55 is installed inside the slanted cone plate 54. A restraining cylinder 56 is fixedly sleeved on the outside of the guide post 55. The bottom end of the restraining cylinder 56 is fixedly connected to a concentric disk 501, and a number of oblique slices 502 are fixedly connected to the outside of the concentric disk 501, and the oblique slices 502 are designed as an inclined arc structure. The internal structure of the stabilizing frame 52 is movably connected to a concentric frame 59, which is sleeved on the outside of the restraining cylinder 56. The restraining cylinder 56 and the concentric frame 59 are connected by a torsion assembly, which is used to drive the concentric frame 59 to swing up and down along the inside of the stabilizing frame 52. The torsion assembly includes two concentric columns 58 installed on the outside of the restraining cylinder 56. The concentric frame 59 has two concentric holes 57 inside for the two concentric columns 58 to be inserted, and there is a floating gap between the concentric columns 58 and the concentric holes 57. Two torsion columns 503 are fixed to the outside of the concentric frame 59. Two torsion holes 504 are provided on the outside of the connecting frame 52 for the two torsion columns 503 to be inserted. One end of one of the torsion columns 503 is fixedly connected to a filter disc 505, and the filter disc 505 reciprocates along one end of the filter screen 14 through the torsion column 503.

[0020] Working principle: When using: refer to Figure 1 , Figure 2 and Figure 3 As shown, when wastewater recycling is required; First, to achieve dynamic synergy between the existing wastewater and the newly introduced wastewater inside the reaction cylinder 1, the external wastewater to be treated is continuously introduced into the intermediate reaction cavity 21 through the inlet pipe 11. During this process, the first servo motor 26 drives the connecting shaft 25 to rotate synchronously along the end of the reaction cylinder 1. The rotation of the connecting shaft 25 drives one of the connecting discs 22 to rotate synchronously inside the intermediate reaction cavity 21. The rotation of the connecting disc 22 drives each of the baffle frames 23 to rotate circumferentially inside the intermediate reaction cavity 21. The other connecting disc 22 rotates synchronously inside the intermediate reaction cavity 21 along with the rotation of each baffle frame 23, forming a stable double-disc support. With a fixed rotating structure, when new wastewater is introduced, the first upper baffle 23 directly bears the axial impact of the water flow, dispersing the kinetic energy of the concentrated incoming water into flowing energy that diffuses circumferentially along the baffle 23. This effectively dissipates the impact energy of the new wastewater in the early stages of entering the cylinder, avoiding flow field turbulence caused by high-speed incoming water directly impacting the existing wastewater inside the cylinder. As each baffle 23 continues to rotate, through a multi-plate collaborative structural design, each baffle 23 creates a differentiated shear mixing effect on the wastewater: the upper baffle 23 focuses on energy dissipation and initial mixing of the incoming water impact, while the remaining baffles 23 are located within the central reaction cavity 21. The system consists of two independent rotating spaces, a middle layer and a lower layer. The middle layer baffle 23 performs secondary dispersion and homogenization on the wastewater that has undergone preliminary slow release from the upper layer, further homogenizing the flow velocity and concentration distribution. The lower layer baffle 23 performs final rectification on the wastewater about to enter the filter screen 14, ensuring that the water flows through the filter screen 14 in a stable and uniform manner. The baffles 23 are staggered in height, causing the wastewater to undergo multiple hydraulic buffering processes during its vertical downward flow, gradually dissipating its kinetic energy and causing the flow velocity to decrease in a stepwise manner. Based on this, the wastewater forms a ring-shaped area defined by the baffles 23. The controllable flow state of alternating laminar and turbulent flow is specifically characterized by the following: when the newly introduced wastewater passes through the annular channel between the baffle 23 and the cylinder wall, it makes tangential contact with the existing wastewater in the cylinder, forming a mild and controllable gradient mixing effect. This dynamic mixing effect promotes full contact between the newly introduced wastewater and the neutralizing agent and suspended solids in the existing wastewater, laying a homogenized material foundation for the uniform and full neutralization reaction. On the other hand, because the mixing effect is mild and controllable, it will not cause violent disturbance to the suspended solids that have settled at the bottom of the cylinder, avoiding secondary back-mixing and floating of the settled solids, and ensuring the stability of the initial settling effect. refer to Figure 4 and Figure 5As shown, the baffle 23, while performing the function of hydraulic slow release, also forms a slow flow guiding synergy mechanism with the filter screen 14: the wastewater, after being dispersed and homogenized by the baffle 23, has a significantly reduced flow velocity, and its flow direction gradually turns towards the filter screen 14 under the guidance of the bottom structure; since the inlet flow velocity has been effectively controlled in multiple stages, the wastewater passes through the filter screen 14 in a slow and stable laminar flow state, significantly reducing the instantaneous flow impact and local hydraulic load on the filter screen 14. During the process of the treated wastewater flowing towards the filter screen 14, the telescopic cylinder 31 extends, pushing the support plate 32 to move directionally along the inside of the guide groove 37. During the movement of the support plate 32, the squeezing groove 33 on its side wall and the connecting column 35 form a push in the oblique direction. In a dynamic coordination, the inner wall of the extrusion groove 33 contacts the outer side of the connecting column 35 and pushes the connecting column 35 to move downward along the inside of the L-shaped groove 36. After the connecting column 35 completes vertical displacement along the inside of the L-shaped groove 36, it forms a limiting contact with the bottom of the vertical section of the L-shaped groove 36. As the support plate 32 continues to move, the extrusion groove 33 pushes the connecting column 35 to move horizontally along the transverse section of the L-shaped groove 36. Specifically, the vertical movement of the connecting column 35 drives the hair separating and cleaning frame 27 to sweep across the entire height direction of the filter screen 14, and the horizontal reciprocating movement drives the hair separating and cleaning frame 27 to sweep across the entire circumferential direction of the filter screen 14. The two superimposed form a two-dimensional composite motion trajectory covering the entire filter surface of the filter screen 14, rather than a single-dimensional linear cleaning. refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, during this process, the cleaning frame 27 moves back and forth along the surface of the filter screen 14, creating a controllable disturbance to the wastewater near the filter screen 14. This disturbance improves the hydraulic conditions near the filter screen 14, eliminates dead zones in the water flow around the filter surface, makes the wastewater composition in the filtration area more uniform, and reduces the local deposition of suspended solids. On the other hand, it can clean the filter pores on the surface of the filter screen 14 in real time, scraping off the suspended solids and filter cake layer attached to the surface of the filter pores, avoiding filter pore blockage and continuous thickening of the filter cake layer, and ensuring the long-term stability of the filtration flux of the filter screen 14. The above-mentioned slow flow guiding synergistic mechanism reduces the probability of suspended solids deposition on the surface of the filter screen 14 by pre-controlling the flow rate, reducing the risk of filter pore blockage. On the other hand, it enables the filter screen 14 to continuously perform its filtration function under stable hydraulic conditions, significantly extending the effective working cycle of the filter screen 14 and reducing the frequency of equipment downtime maintenance. refer to Figure 2 , Figure 3 and Figure 6As shown, secondly, the lint separator 27 forms a linkage and self-cleaning synergy with the corresponding spoiler 23 during its movement: through the continuous rotation of the corresponding spoiler 23, its outer edge intermittently contacts the arc-shaped surface of the arc lifting block 46. During the rotation of the spoiler 23, it pushes the arc lifting block 46 to move upward along one side of the receiving frame 41. The center-limiting slide bar 45 moves upward synchronously along the inside of the center-limiting groove 44 as the arc lifting block 46 moves, thereby driving the slide 42 to move upward synchronously along the outside of the receiving frame 41. This causes the self-cleaning roller 43 on the slide 42 to form an alternating contact with the side wall of the reciprocating lint separator 27, performing real-time scraping and self-cleaning on the cleaning surface of the lint separator 27, removing suspended matter and fibrous impurities attached to the surface of the lint separator 27, and ensuring that the lint separator 27 is always clean. In a clean state, thus maintaining its effectiveness in cleaning the filter screen 14 for a long time, as the limiting slide bar 45 moves upward, its top pushes the return spring 47 to elastically compress along the inside of the limiting groove 44; when the corresponding spoiler frame 23 rotates to the point where it intersects and separates from the arc surface of the arc lifting block 46, the resistance of the spoiler frame 23 to the arc lifting block 46 disappears, the compressed return spring 47 releases its elastic potential energy and resets, applying a reverse pushing force to the top of the limiting slide bar 45, and then pushing the limiting slide bar 45 to move downward along the inside of the limiting groove 44. The limiting slide bar 45 simultaneously drives the slide frame 42, the self-cleaning roller 43 and the arc lifting block 46 to move downward and reset to the initial position, waiting for the next contact with the spoiler frame 23, thus realizing continuous intermittent self-cleaning operation; refer to Figure 4 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, finally, when the wastewater to be treated passes through the filter surface of the filter screen 14 and enters the settling cylinder 12, the second servo motor 51 starts, and the output end of the second servo motor 51 drives the traction plate 53 to rotate synchronously. While the traction plate 53 rotates along the inside of the settling cylinder 12 and the connecting frame 52, it drives the guide column 55 to rotate clockwise along the inside of the connecting frame 52. Under the rotation linkage of the inclined cone plate 54, it drives the guide column 55 and the restraining cylinder 56 to rotate synchronously along the inside of the concentric frame 59. The restraining cylinder 56 makes a circular motion along the inside of the concentric frame 59, which in turn drives the concentric column 58 to rotate synchronously, causing the concentric frame 59 to rotate along the settling cylinder 12. The interior of the settling cylinder 12 oscillates back and forth. At this time, the relative position of the guide column 55 and the restraining cylinder 56 with the stabilizing frame 52 changes from a horizontal state to a vertical state, causing the concentric frame 59 to switch from a horizontal state to an inclined state along the interior of the stabilizing frame 52, thereby achieving the hydraulic regulation effect of lifting and pressing the wastewater near the top of the settling cylinder 12. As the restraining cylinder 56 continues to rotate, its relative position with the concentric frame 59 and the stabilizing frame 52 returns from a vertical state to a horizontal state. During this process, the two concentric columns 58 rotate along the interior of the concentric hole 57 and are synchronously lifted, causing the concentric frame 59 to return from an inclined state to a horizontal state. refer to Figure 4 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, while the concentric frame 59 rotates, it drives the torsion column 503 to rotate synchronously along the inside of the torsion hole 504. The rotation of the torsion column 503 drives the filter disc 505 to perform auxiliary reciprocating rotation along the surface of the filter screen 14, enhancing the cleaning effect of the filter surface. When the restraining cylinder 56 continues to rotate, its relative position with the concentric frame 59 and the stabilizing frame 52 changes from a horizontal state to a vertical state again, pushing the concentric frame 59 to switch from a horizontal state to an inclined state again. Through the above continuous rotation, the inclination direction of the concentric frame 59 alternately changes along both sides of the stabilizing frame 52 until the relative position of the restraining cylinder 56 and the guide column 55 with the stabilizing frame 52 returns from a vertical state to a horizontal state. Complete one full cycle of motion, through the aforementioned reciprocating motion, the concentric disk 501 and the oblique slice 502 continuously cut into the interior of the settling cylinder 12 from the top to the middle and bottom, actively reconstructing the flow field within the settling cylinder 12. Specifically, when the oblique slice 502 swings back and forth with the concentric frame 59, its inclined arc-shaped surface applies directional thrust to the wastewater, pushing the wastewater to form a controllable flow in three dimensions: circumferential flow in the horizontal direction, allowing the wastewater to mix uniformly on the cross-section of the settling cylinder 12, eliminating local deviations in water concentration and temperature; and vertical circulation flow, allowing the upper and lower layers of wastewater to exchange fully, preventing the stratification and accumulation of suspended solids. refer to Figure 4 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, local micro-vortices are generated along the tangent of the curved surface, dispersing small suspended particles and preventing them from agglomerating and settling at the bottom of the cylinder too quickly. Simultaneously, the disturbance intensity of the oblique slice 502 is controlled within a preset moderate range, ensuring that it does not hinder the normal gravity settling of large suspended particles, achieving the ideal settling condition of gentle disturbance and heavy settling: small suspended particles are kept in suspension by the micro-vortices and continue to be transported to the heated separation cylinder 13 with the water flow; large suspended particles settle slowly and uniformly under the action of weak disturbance, avoiding blockage and caking at the bottom of the cylinder caused by rapid deposition in a static state. This flow field reconstruction effect makes the settling cylinder 1... 2. It has the dual functions of sedimentation separation and suspended solids particle size control. The oblique slice 502 controls the disturbance of the wastewater in the sedimentation cylinder 12, which not only greatly improves the sedimentation separation effect, but also forms a synergistic mechanism with the subsequent heating separation process to connect the hydraulic state. After the disturbance treatment, the wastewater has a more reasonable suspended solids particle size distribution, the water quality concentration fluctuation is significantly reduced, and the composition is more homogeneous. When the stable wastewater enters the heating separation cylinder 13, it creates stable and homogeneous inlet conditions for the subsequent heating separation process, which greatly improves the operational stability and component separation efficiency of the wastewater treatment inside the heating separation cylinder 13.

[0021] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A wastewater recovery device for the production of AKD raw powder, a papermaking additive, comprising a reaction cylinder (1), a settling cylinder (12), and a heating separation cylinder (13), wherein one end of the reaction cylinder (1) is equipped with a water inlet pipe (11) communicating with its interior, and a filter screen (14) is connected between the reaction cylinder (1) and the settling cylinder (12), characterized in that: The reactor (1) is equipped with a reaction assembly (2), which is used to achieve the diversion and coordinated treatment of wastewater inside the reactor (1) and to complete the stable settling operation of wastewater contained in the settling tank (12). The intermediate reaction assembly (2) includes an intermediate reaction cavity (21) housed inside the reaction cylinder (1) and several baffles (23) movably connected inside the intermediate reaction cavity (21), and the shape of each baffle (23) is different. A hair separation and cleaning frame (27) is movably connected to the side of the intermediate reaction cavity (21) near the filter screen (14), and the hair separation and cleaning frame (27) moves horizontally along one side of the filter screen (14). A power assembly is installed outside the reaction cylinder (1), and the power assembly is used to drive several baffles (23) to rotate synchronously. A side disturbance component (3) is provided between the reaction cylinder (1) and the settling cylinder (12) for driving the hair separation and cleaning frame (27) to move up and down and left and right. A self-cleaning component (4) is provided between one of the spoiler frames (23) and the hair separation and cleaning frame (27), and the self-cleaning component (4) is used to perform coarse cleaning on the hair separation and cleaning frame (27); A slanted component (5) is provided between the settling cylinder (12) and the filter screen (14), and the slanted component (5) guides the wastewater inside the settling cylinder (12) to flow slowly in a slanted manner.

2. The wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 1, is characterized in that: The power assembly includes two connecting discs (22) rotatably connected inside the central cavity (21). Each connecting disc (22) has a side arm (24) fixedly connected to one end, and one end of the side arm (24) is fixedly connected to one side of the spoiler frame (23). The lengths of each pair of side arms (24) are different from each other, and the spoiler (23) forms a gradient rotation inside the central cavity (21) through the side arms (24); The reaction cylinder (1) is fixedly connected to the outside of a first servo motor (26), and the output end of the first servo motor (26) is fixedly connected to a connecting shaft (25). One end of the connecting shaft (25) extends into the interior of the reaction cylinder (1) and the intermediate reaction cavity (21) and is fixedly connected to one of the connecting discs (22).

3. The wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 1, is characterized in that: The side disturbance assembly (3) includes a guide groove (37) opened between the reaction cylinder (1) and the settling cylinder (12) and a centering frame (34) fixedly connected to the top of the filter screen (14). The centering frame (34) is located inside the guide groove (37). An L-shaped groove (36) is opened on one side of the centering frame (34). A connecting column (35) is fixedly connected to the top of the hair separation and cleaning frame (27), and the connecting column (35) is located inside the L-shaped groove (36). The top of the reaction cylinder (1) is fixedly connected to a telescopic cylinder (31), and the telescopic end of the telescopic cylinder (31) is fixedly connected to a support plate (32). The support plate (32) is slidably connected inside the guide groove (37). A compression groove (33) for inserting a connecting column (35) is provided on one side of the support plate (32), and the connecting column (35) moves in multiple dimensions along the inside of the L-shaped groove (36) through the support plate (32).

4. The wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 3, is characterized in that: The self-cleaning assembly (4) includes a receiving frame (41) fixedly connected to the side of the intermediate reaction cavity (21) near the filter screen (14). A limiting groove (44) is opened on the outside of the receiving frame (41). A slide (42) is slidably connected inside the limiting groove (44). A self-cleaning roller (43) is fixedly connected to the side of the slide (42) near the filter screen (14). The outside of the self-cleaning roller (43) is in contact with one side of the hair separation and cleaning frame (27). An arc lifting block (46) that cooperates with one of the baffle frames (23) is installed on the outside of the receiving frame (41). The arc lifting block (46) is designed as an arc structure.

5. A wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 4, characterized in that: A return spring (47) is also fixedly connected inside the center-limiting groove (44). The end of the return spring (47) away from the center-limiting groove (44) is fixedly connected to the center-limiting slide rod (45). One end of the arc lifting block (46) extends into the interior of the center-limiting groove (44) and is fixedly connected to one side of the center-limiting slide rod (45). The center-limiting slide bar (45) is fixedly connected to one side of the slide frame (42) on the side away from the arc lifting block (46), and the slide frame (42) moves back and forth along the outside of the support frame (41) through the center-limiting slide bar (45).

6. The wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 1, is characterized in that: The oblique cutting component (5) includes a stabilizing frame (52) fixedly connected inside the settling cylinder (12) and a second servo motor (51) fixedly connected to the top of the stabilizing frame (52). The driving end of the second servo motor (51) extends into the interior of the settling cylinder (12) and is fixedly connected to a traction plate (53). One end of the traction plate (53) is obliquely fixedly connected to an inclined cone plate (54). A guide post (55) is installed inside the inclined cone plate (54), and a restraining cylinder (56) is fixedly sleeved on the outside of the guide post (55). The bottom end of the restraining cylinder (56) is fixedly connected to a concentric disk (501), and a number of oblique slices (502) are fixedly connected to the outside of the concentric disk (501), and the oblique slices (502) are designed as an inclined arc structure. The internal stabilizing frame (52) is movably connected to a concentric frame (59), and the concentric frame (59) is sleeved on the outside of the restraining cylinder (56). The restraining cylinder (56) and the concentric frame (59) are connected by a torsion assembly, which is used to drive the concentric frame (59) to swing up and down along the inside of the stabilizing frame (52).

7. A wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 6, characterized in that: The torsion assembly includes two concentric columns (58) installed outside the restraining cylinder (56). The concentric frame (59) has two concentric holes (57) inside for the two concentric columns (58) to be inserted, and there is a floating gap between the concentric columns (58) and the concentric holes (57).

8. A wastewater recovery device for the production of AKD raw powder, a papermaking additive, according to claim 7, characterized in that: Two torsion columns (503) are fixed to the outside of the concentric frame (59). Two torsion holes (504) are opened on the outside of the connecting frame (52) for the two torsion columns (503) to be inserted. One end of one of the torsion columns (503) is fixedly connected to a filter disc (505), and the filter disc (505) reciprocates along one end of the filter screen (14) through the torsion column (503).

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