Flocculating agent feeding device for solid-liquid separation

Abstract

The invention belongs to the technical field of water treatment equipment, and particularly provides a flocculant dosing device for solid-liquid separation, which is applied to a fluidized bed and comprises a medicine storage mechanism, a multi-stage dosing mechanism and a flow guide mechanism, the medicine storage mechanism is used for storing a liquid flocculant, and the output end of the medicine storage mechanism is communicated with the multi-stage dosing mechanism through a pump body; the multi-stage dosing mechanism comprises a pre-dosing pipeline, a first-stage dosing assembly and a second-stage dosing assembly; the output end of the pre-dosing pipeline is communicated with a fluidized bed water inlet pipe, the first-stage dosing assembly and the second-stage dosing assembly are arranged on the lower portion of the fluidized bed in a sleeving mode at intervals, the first-stage dosing assembly and the second-stage dosing assembly can spray a flocculating agent into the fluidized bed in a multi-point distributed injection mode, and the flow guide mechanism is rotationally arranged in the fluidized bed. And the device can be pushed to rotate by a flocculating agent jet flow sprayed by the multi-stage dosing unit. Through the multi-stage dosing mechanism, the mixing uniformity of a flocculating agent and sewage is improved.

Description

Technical Field

[0001] This application belongs to the field of water treatment equipment technology, and more specifically, relates to a flocculant dosing device for solid-liquid separation. Background Technology

[0002] In fluidized bed solid-liquid separation processes, the core requirement is to target and capture suspended solids carried in the influent by adding flocculants, thereby separating solid impurities from the water and improving the solid-liquid separation effect. Taking a conventional solid-liquid separation fluidized bed as an example, the water flow in the fluidized bed is in an upward flow pattern, and the flow pattern varies significantly at different heights.

[0003] Existing dosing devices for solid-liquid separation fluidized beds typically dispense flocculants at a single location, resulting in limited coverage and an inability to meet the mixing requirements of the entire cross-section at the bottom of the fluidized bed. Furthermore, the flocculant sprayed from the dosing point is easily carried away by the rising water flow, leading to insufficient flocculant concentration in some areas and ultimately affecting the solid-liquid separation effect. Summary of the Invention

[0004] Based on the above-mentioned technical problems, this application provides a flocculant dosing device for solid-liquid separation, in order to solve the technical problems existing in the prior art, such as poor uniformity of mixing between the flocculant and the sewage in the fluidized bed, easy formation of flocculation dead zones, and thus affecting the solid-liquid separation effect.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A flocculant dosing device for solid-liquid separation, applied to a fluidized bed, includes: a flocculant storage mechanism, a multi-stage dosing mechanism, and a flow guiding mechanism; the flocculant storage mechanism stores liquid flocculant, and its output end is connected to the multi-stage dosing mechanism via a pump; the multi-stage dosing mechanism includes a pre-dosing pipe, a primary dosing assembly, and a secondary dosing assembly; the output end of the pre-dosing pipe is connected to the fluidized bed inlet pipe; the primary and secondary dosing assemblies are spaced apart and fitted into the lower part of the fluidized bed, and can inject flocculant into the fluidized bed in a multi-point distributed injection manner; the flow guiding mechanism is rotatably disposed inside the fluidized bed and can be driven to rotate by the flocculant jets sprayed from the multi-stage dosing unit.

[0006] Furthermore, the primary dosing assembly has the same structure as the secondary dosing assembly. The primary dosing assembly includes a dosing tube and multiple jet nozzles. The dosing tube has a spiral structure and is wound around the outside of the fluidized bed. The multiple jet nozzles are staggered and evenly arranged along the spiral trajectory of the dosing tube, and the output end of each jet nozzle extends through the side wall of the fluidized bed toward the direction close to the flow guiding mechanism.

[0007] Furthermore, the spiral angle of the drug delivery tube is 5 to 15 degrees, and the number of jet nozzles is eight or ten. When the number of jet nozzles is eight, the circumferential angle between two adjacent jet nozzles is 45 degrees, and when the number of jet nozzles is ten, the circumferential angle between two adjacent jet nozzles is 36 degrees.

[0008] Furthermore, the flow guiding mechanism corresponds to the primary dosing assembly and the secondary dosing assembly. The flow guiding mechanism includes a shaft and a damping disk with multiple flow guiding blades. The shaft is coaxially rotatably disposed within the fluidized bed. The damping disk is fixed to the top of the outer side of the fluidized bed, and the top of the shaft passes through the damping disk and is frictionally connected to the damping disk. The number of the multiple flow guiding blades is the same as the number of the multiple jet nozzles, and they are spirally arranged around the outer side of the shaft. The helix angle of the multiple flow guiding blades is consistent with the helix angle of the dosing tube, and the output ends of the multiple jet nozzles face the flow-receiving surface of the multiple flow guiding blades.

[0009] Furthermore, each of the guide vanes has multiple guide grooves on its flow-carrying surface, and the multiple guide grooves are evenly arranged along the extension direction of the guide vane.

[0010] Furthermore, a water distribution plate is provided at the bottom of the fluidized bed, and the water inlet pipe of the fluidized bed is connected to the water distribution plate.

[0011] Furthermore, a liquid delivery pipe is provided on one side of the fluidized bed, and one end of the liquid delivery pipe is connected to the drug storage mechanism; the pre-dosing pipeline, the primary dosing assembly, and the secondary dosing assembly are respectively connected to the liquid delivery pipe through the liquid distribution pipe.

[0012] Furthermore, each of the dispensing pipes is equipped with a solenoid valve, and the distribution ratio of the pre-dosing pipeline, the primary dosing component, and the secondary dosing component to the total dosing amount is 2:5:3.

[0013] Furthermore, the fluidized bed includes an inner cylinder and an outer cylinder, which are fixedly connected by a plurality of connecting pipes. The first end of each connecting pipe is connected to the interior of the inner cylinder, and the second end extends downward at an angle and passes through the outer cylinder to communicate with the outside. A plurality of jet nozzles are inserted into the plurality of connecting pipes and are sealed to the connecting pipes.

[0014] Furthermore, multiple connecting elbows are provided between the fluidized bed and the drug delivery pipe. Each connecting elbow has its two ends connected to the corresponding drug delivery pipe and the connecting pipe via a union joint, so that the two ends of the connecting elbow are respectively connected to the drug delivery pipe and the jet nozzle.

[0015] Compared with the prior art, the beneficial effects of the flocculant dosing device for solid-liquid separation provided in this application are: 1. Flocculant is injected into the bottom of the fluidized bed through a pre-dosing pipeline, and then injected into the lower part of the fluidized bed through a primary dosing assembly and a secondary dosing assembly at intervals. This improves the uniformity of mixing between the flocculant and the wastewater in the fluidized bed after injection. At the same time, multi-point distributed injection combined with the rotation of the jet-driven flow guiding mechanism avoids the lag in flocculant diffusion, effectively eliminates dead zones in flocculation, and avoids flocculation failure caused by insufficient local dosage. In addition, the flocculant injected by the multi-stage dosing mechanism does not require additional power to drive the flow guiding mechanism, which simplifies the structure and improves energy utilization. 2. By matching the blades with the nozzles and coordinating the uniform staggered arrangement of the nozzles around the circumference, it is ensured that at least two jets act on different guide blades at the same time, forming a continuous and uniform driving force. This avoids the guide mechanism from jamming due to overload or uneven force on a single blade, achieving smooth rotation. The spiral upward flow formed by the spiral blades can prolong the contact path and contact time between the flocculant and the wastewater compared to disordered water flow, thus improving the mixing uniformity. 3. The combination design of connecting pipes, connecting elbows and unions allows for nozzle disassembly and cleaning without disassembling the main body of the bed, reducing maintenance difficulty. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a flocculant dosing device for solid-liquid separation according to the present invention; Figure 2 This is a schematic cross-sectional view of a flocculant dosing device for solid-liquid separation according to the present invention. Figure 3 This is a three-dimensional structural diagram of the flow guiding mechanism of the present invention; Figure 4 This is a structural diagram of the connecting elbow of the present invention; Figure 5 This is a cross-sectional view of the mounting structure of the jet nozzle of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Fluidized bed; 11. Inner cylinder; 12. Outer cylinder; 13. Water distribution plate; 131. Water distribution head; 14. Connecting pipe; 15. Inlet pipe; 2. Drug storage mechanism; 21. Drug storage tank; 22. Motor; 23. Pump body; 3. Multi-stage dosing mechanism; 31. Liquid delivery pipe; 32. Liquid distribution pipe; 33. Pre-dosing pipeline; 34. Primary dosing assembly; 341. Dosing tube; 342. Jet nozzle; 35. Secondary dosing assembly; 36. Connecting elbow; 37. Union joint; 38. Solenoid valve; 6. Flow guiding mechanism; 61. Shaft; 62. Flow guiding blade; 621. Flow guiding groove; 63. Damping disc. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Please refer to the following: Figures 1 to 5As shown, the following describes a flocculant dosing device for solid-liquid separation provided in an embodiment of this application. This invention provides a flocculant dosing device for solid-liquid separation, applied to a fluidized bed 1. It should be noted that the fluidized bed 1 is a prior art device, comprising an axially penetrating inner cylinder 11 and an outer cylinder 12 sleeved outside the inner cylinder 11. Both ends of the outer cylinder 12 are closed structures. Wastewater to be purified enters from the inlet pipe 15 at the bottom of the fluidized bed 1 and flows upwards. Suspended solids carried in the wastewater migrate with the upward flow. Therefore, flocculant needs to be added to the fluidized bed 1 to target and flocculate the suspended solids, forming flocs that then flow with the water into the connecting area between the inner and outer cylinders 12. Finally, solid-liquid separation is achieved in the external sedimentation zone. The purified water is stored in the top clear water zone, completing the solid-liquid separation process. This invention, by optimizing the dosing layout and adding a flow guiding mechanism, achieves efficient and uniform mixing of the flocculant and wastewater, eliminates flocculation dead zones, and improves solid-liquid separation efficiency.

[0025] The solid-liquid separation flocculant dosing device of the present invention (hereinafter referred to as the device) includes a flocculant storage mechanism 2, a multi-stage dosing mechanism 3, and a flow guiding mechanism 6. The flocculant storage mechanism 2 is used to store and dilute the liquid flocculant, and its output end is connected to the multi-stage dosing mechanism 3 via a pump body 23. Specifically, the flocculant storage mechanism 2 includes a storage tank 21, a stirring assembly (not shown in the figure), and a motor 22. The stirring assembly is a prior art device, rotatably mounted inside the storage tank 21, such as a common paddle mixer or anchor mixer; its specific structure and connection method will not be described here. The motor 22 is fixedly mounted on the top of the storage tank 21, and its output end passes through the top of the storage tank 21 and is fixedly connected to the stirring assembly.

[0026] During implementation, workers fill the storage tank 21 with liquid or dry flocculant, then pour in clean water. Next, they start the motor 22 at the top of the storage tank 21, which drives the stirring assembly to continuously mix the liquid flocculant. This prevents sedimentation and stratification of the flocculant due to settling. The mixed flocculant maintains a uniform concentration and enters the pump body 23 through the outlet at the bottom of the storage tank 21 for stable and quantitative delivery. This ensures consistent flocculant concentration delivered to the multi-stage dosing mechanism 3, preventing localized over- or under-flocculation due to concentration fluctuations, and guaranteeing thorough mixing of wastewater and flocculant within the fluidized bed 1.

[0027] Preferably, the inlet of the chemical storage unit 2 is connected to the clean water area of ​​the fluidized bed through a pipeline. That is, the chemical storage unit draws clean water from the fluidized bed after solid-liquid separation. In this way, there is no need for an external clean water source, eliminating the need for external pipelines, valves, filters and other accessories, simplifying the overall system structure, reducing the difficulty of equipment installation and maintenance, and realizing internal water resource circulation through clean water reuse. This significantly reduces water resource consumption costs without consuming external clean water. In addition, the water quality parameters (such as pH, calcium and magnesium ion concentration) of external water sources may differ from those of the clean water in the fluidized bed 1. Large-scale access can cause fluctuations in the overall water quality in the bed, which in turn affects the targeted capture effect of the flocculant. Reusing its own clean water can avoid this problem, thereby ensuring stable mixing reaction conditions between the flocculant and the wastewater.

[0028] The multi-stage dosing mechanism 3 includes a pre-dosing pipeline 33, a primary dosing assembly 34, and a secondary dosing assembly 35. In this embodiment, a delivery pipe 31 is provided on one side of the fluidized bed 1. One end of the delivery pipe 31 is connected to the storage mechanism 2. The pre-dosing pipeline, the primary dosing assembly 34, and the secondary dosing assembly 35 are respectively connected to the delivery pipe 31 through distribution pipes 32. Each distribution pipe 32 is equipped with a solenoid valve 38. In practice, the flocculant output from the storage mechanism 2 is transported to the delivery pipe 31 via the pump body 23. The delivery pipe 31 serves as the main delivery channel and is connected to the pre-dosing pipeline 33, the primary dosing assembly 34, and the secondary dosing assembly 35 through multiple distribution pipes 32. At the same time, by controlling the opening / closing and the opening degree of the solenoid valves 38 on each distribution pipe 32, the independent start and stop of each dosing path and the precise adjustment of the dosing flow rate of each path are achieved to achieve dynamic adaptation. This allows the dosage of the pre-dosing pipeline 33, the primary dosing component 34, and the secondary dosing component 35 to be precisely matched to the flocculation requirements of the corresponding area, further improving the utilization rate of flocculants.

[0029] Preferably, the pre-dosing pipeline, primary dosing assembly, and secondary dosing assembly are distributed in a 2:5:3 ratio to the total dosing volume. Specifically, the pre-dosing pipeline accounts for 20% of the total dosing volume, used for pre-mixing with wastewater to form micro-flocculations, laying the foundation for subsequent mixing reactions; the primary dosing assembly, as the core dosing unit, accounts for 50% of the total dosing volume, achieving primary mixing of flocculant and wastewater through multi-point distributed jetting, avoiding local concentration deviations; the secondary dosing assembly, as a supplementary dosing unit, accounts for 30% of the total dosing volume, precisely filling local concentration blind spots after primary dosing. The three work together to form a stepped dosing structure of pre-mixing, primary mixing, and supplementary mixing, ensuring uniform distribution of flocculant across the entire cross-section in the lower dosing reaction zone. This allows the dosage distribution of the pre-dosing pipeline 33, the primary dosing component 34, and the secondary dosing component 35 to be precisely matched with the flow characteristics and flocculation requirements of the lower dosing reaction zone, thus avoiding the concentration gradient problem of single dosing and maximizing the utilization rate of flocculants.

[0030] The output end of the pre-dosing pipe 33 is connected to the inlet pipe 15 of the fluidized bed 1. Preferably, a water distribution plate 13 is provided at the bottom of the fluidized bed 1, and the inlet pipe 15 of the fluidized bed 1 is connected to the water distribution plate 13. Specifically, the water distribution plate 13 has an internal hollow box structure, and the inlet pipe 15 is connected to the interior of the water distribution plate 13. Multiple water distribution heads 131 are connected to the top surface of the water distribution plate 13 to achieve uniform water distribution. In implementation, after the pre-dosing pipe 33 delivers the flocculant to the inlet pipe 15, it is mixed with the sewage in advance to form a mixed water flow containing micro-flocs. The mixed water flow enters the interior of the water distribution plate 13 at the bottom of the fluidized bed 1 through the inlet pipe 15, and then the water flow is evenly distributed to the entire cross-section of the bottom of the fluidized bed 1 through the multiple water distribution heads 131, so that the water flow rises steadily, and at the same time lays a stable flow foundation for the mixing effect of the primary dosing component 34, the secondary dosing component 35 and the flow guiding mechanism 6 described later.

[0031] It should be noted that the tiny flocs formed by pre-mixing the flocculant with the wastewater through the pre-dosing pipe 33 will not clog the water distribution head 131. Simultaneously, it reduces the deposition of suspended solids on the surface of the water distribution plate 13, ensuring uniform water distribution. Furthermore, the uniform upward flow achieved by the water distribution plate 13 prevents localized areas of excessively fast or slow water flow within the bed. The pre-doped mixed water flows evenly through the water distribution plate 13, ensuring that the pre-mixed flocculant evenly covers the bottom area of ​​the bed, preventing uneven flocculant concentration in the bottom region.

[0032] The primary dosing assembly 34 and the secondary dosing assembly 35 are spaced apart and mounted at the bottom of the fluidized bed 1. Both the primary and secondary dosing assemblies 34 and 35 can inject flocculant into the fluidized bed 1 in a multi-point distributed injection manner. The flow guiding mechanism 6 is rotatably installed inside the fluidized bed 1 and can be driven to rotate by the flocculant jets sprayed from the multi-stage dosing units. In practice, the primary and secondary dosing assemblies 34 and 35 are spaced apart and mounted at the bottom of the fluidized bed 1 along the height direction of the fluidized bed, and inject flocculant into the lower part of the bed in a multi-point distributed injection manner. The flocculant sprayed by the primary and secondary dosing assemblies 34 and 35 forms a high-speed jet, which impacts the flow guiding mechanism 6 inside the fluidized bed 1, driving the flow guiding mechanism 6 to rotate around its own axis. The rotating flow guiding mechanism 6 drives the water flow in the bed to form an orderly spiral flow, further promoting the uniform mixing of flocculant and sewage.

[0033] This method utilizes a three-stage dosing system: flocculant is injected into the bottom of the fluidized bed 1 (at the water distribution plate 13) via the pre-dosing pipe 33; and then injected into the lower part of the fluidized bed 1 via the primary dosing assembly 34 and the secondary dosing assembly 35. This three-stage dosing system effectively addresses the limited coverage of traditional single-dosing systems. Simultaneously, the multi-point distributed injection, combined with the jet-driven flow guiding mechanism 6, breaks the rapid carry-away effect of the rising water flow on the flocculant, preventing delayed flocculant diffusion and effectively eliminating flocculation dead zones. This ensures uniform contact of the flocculant with fine particles and suspended solids, preventing flocculation failure due to insufficient local dosage and guaranteeing solid-liquid separation. Furthermore, the flocculant injected through the multi-stage dosing mechanism 3 eliminates the need for additional power to drive the flow guiding mechanism 6, simplifying the structure and improving energy utilization.

[0034] Specifically, the primary dosing assembly 34 and the secondary dosing assembly 35 of this device have the same structure. Taking the primary dosing assembly 34 as an example, it includes a dosing pipe 341 and multiple jet nozzles 342. The dosing pipe 341 has a spiral structure and is wound around the outside of the fluidized bed 1. The multiple jet nozzles 342 are staggered and evenly arranged along the spiral trajectory of the dosing pipe 341. The output end of each jet nozzle 342 extends through the side wall of the fluidized bed 1 towards the direction close to the flow guiding mechanism 6. In practice, the flocculant delivered by the pump body 23 enters the dosing pipes 341 of the primary dosing assembly 34 and the secondary dosing assembly 35 respectively. Due to the staggered and evenly arranged nozzles, a multi-directional and multi-height diffused flow is formed.

[0035] It should be noted that staggered and uniform arrangement specifically refers to the nozzles not only achieving axial uniform distribution along the extension trajectory of the spiral dosing tube 341 (i.e., uniform spacing along the height of the bed), but also maintaining a uniform angular spacing in the circumferential direction (along the circumference of the bed), avoiding overlap of adjacent nozzles in the same radial plane, and achieving dual uniform dispersion in the axial and circumferential directions; each nozzle is distributed in the above manner, and after its output end passes through the side wall of the fluidized bed 1, it accurately sprays flocculant in the direction of the flow guiding mechanism 6, forming a multi-directional and multi-height diffused flow.

[0036] Preferably, each drug delivery tube 341 has two spiral turns, and the number of jet nozzles 342 is eight or ten, with a spiral angle of 5 to 15 degrees. In practice, when there are eight jet nozzles 342, the circumferential angle between two adjacent jet nozzles 342 is 45 degrees; when there are ten nozzles, the circumferential angle between two adjacent jet nozzles 342 is 36 degrees.

[0037] It should be noted that by using the dosing tube 341 with a spiral angle of 5 to 15 degrees, the flocculant is evenly distributed along the axial direction of the fluidized bed as it flows within the dosing tube 341, and simultaneously delivered to each jet nozzle 342. Combined with the adaptive design of the number of nozzles and the circumferential angle (eight nozzles corresponding to a 45-degree angle, ten nozzles corresponding to a 36-degree angle), each jet forms a complete, dead-angle-free impact point around the fluidized bed 1. Furthermore, in conjunction with the spiral angle of the dosing tube 341, it achieves both axial dosing coverage at different heights through two spiral turns and full cross-sectional coverage through uniform circumferential distribution. In addition, the above parameter combination ensures that the jet impact force accurately matches the force requirements of the flow guiding mechanism 6 (described later), ensuring the smooth rotation of the flow guiding mechanism 6.

[0038] The fluidized bed 1 includes an inner cylinder 11 and an outer cylinder 12. In the prior art, the inner cylinder 11 and the outer cylinder 12 are fixedly welded together by multiple connecting rods. In this embodiment, the inner cylinder 11 and the outer cylinder 12 are fixedly connected by multiple connecting pipes 14. The first end of each connecting pipe 14 is connected to the inside of the inner cylinder 11, and the second end extends downward at an angle and passes through the outer cylinder 12 to communicate with the outside. Multiple jet nozzles 342 are inserted into the multiple connecting pipes 14 and are sealed to the connecting pipes 14. That is, the multiple connecting pipes 14 are spirally arranged between the inner cylinder 11 and the outer cylinder 12, and are adapted to the drug distribution pipe 341 and the multiple jet nozzles 342 arranged on the drug distribution pipe 341.

[0039] It should be noted that by forming a through-channel for the jet nozzle 342 inside the connecting pipe 14, the sealing failure caused by the rigid connection between the jet nozzle 342 and the fluidized bed 1 cylinder wall is avoided, and leakage of high-pressure water / flocculator from the through-channel is also prevented. In addition, the connecting pipe 14 provides an independent installation and removal channel for the nozzle. When the nozzle becomes clogged due to long-term operation, it is not necessary to disassemble the main structure of the fluidized bed 1. The nozzle can be directly removed through the connecting pipe 14 for cleaning or replacement, which greatly reduces maintenance difficulty and shortens downtime.

[0040] Preferably, the second end of the connecting pipe 14 is tilted downwards by 15 to 25 degrees, thereby the jet nozzle 342 is installed inside the connecting pipe 14 and is simultaneously tilted under the constraint of the tilt angle of the connecting pipe 14, so that the jet nozzle 342 can spray in the direction of the guide mechanism 6 in an tilted posture, so as to better drive the guide mechanism 6 described later to rotate.

[0041] In this embodiment, multiple connecting elbows 36 are provided between the fluidized bed 1 and the drug delivery pipe 341. Both ends of the connecting elbows 36 are connected to the drug delivery pipe 341 and the connecting pipe 14 via unions 37, respectively, so that both ends of the connecting elbows 36 are connected to the drug delivery pipe 341 and the jet nozzle 342. In other words, the flocculant transported by the drug delivery pipe 341 is connected to the jet nozzle 342 through the connecting elbows 36; that is, one end of the connecting elbow 36 is connected to the drug delivery pipe 341 via the union 37, and the other end is connected to the second end of the connecting pipe 14 via the union 37. The union 37 is existing technology and is a detachable pipe connector, which will not be described in detail here. When it is necessary to inspect or repair the nozzle or the drug delivery pipe 341, only the union 37 needs to be disassembled to separate the connecting elbow 36 from the connecting pipe 14, thereby removing the nozzle or inspecting or repairing the drug delivery pipe 341. Therefore, by combining the union 37 with the connecting elbow 36, pipeline separation and nozzle maintenance can be achieved without disassembling the entire drug distribution pipe 341 or the external structure of the fluidized bed 1, which greatly reduces the difficulty and workload of maintenance. At the same time, the standardized union 37 and connecting elbow 36 are easy to replace, reducing the later maintenance cost.

[0042] The flow guiding mechanism 6 corresponds to the primary dosing assembly 34 and the secondary dosing assembly 35, respectively. The flow guiding mechanism 6 includes a shaft 61, a damping disk 63, and multiple guide vanes 62. The shaft 61 is coaxially rotatably disposed within the fluidized bed 1. The damping disk 63 is fixed to the top of the outer side of the fluidized bed 1. The top of the shaft 61 passes through the top wall of the fluidized bed, rotatably disposed within the damping disk 63, and frictionally connected to the damping disk 63 to limit the rotational speed of the shaft. It should be noted that the damping disk is existing technology, mainly used to generate controllable resistance through friction and adjust the rotational speed of the rotating component (shaft 61). It is widely used in scenarios requiring stable rotational speeds, such as motors, transmission mechanisms, and automated equipment, and will not be elaborated further here.

[0043] The number of multiple guide vanes 62 is the same as the number of multiple jet nozzles 342 (including multiple jet nozzles 342 of the primary dosing assembly 34 and the secondary dosing assembly 35), and they are spirally wound around the outside of the shaft 61. The spiral angle of the multiple guide vanes 62 is the same as the spiral angle of the dosing tube 341, and the output end of the multiple jet nozzles 342 faces the flow surface of the multiple guide vanes 62.

[0044] During implementation, the jets from the primary dosing assembly 34 and the secondary dosing assembly 35 impact the corresponding guide vanes 62. Since the number of guide vanes 62 is the same as the number of jet nozzles 342, and the helix angle of the guide vanes 62 is consistent with the helix angle of the distribution pipe 341, the jets can precisely act on the flow-bearing surface of the guide vanes 62, forming a uniform driving force that drives the shaft 61 to rotate coaxially. It should be noted that the jets formed by the jet nozzles 342 do not always act on the same guide vane 62, but at least two jets can act on different flow-bearing surfaces of the guide vanes 62 simultaneously, forming a continuous and uniform driving force that drives the shaft 61 to rotate smoothly coaxially. Simultaneously, the rotating guide vanes 62 can cause the water flow within the sulfurized bed 1 to form a spiral upward flow consistent with the helix direction of the vanes, allowing the flocculant jets and wastewater to be fully mixed in the spiral flow, while simultaneously guiding the flocculant to diffuse throughout the entire area.

[0045] Taking the primary dosing assembly 34 as an example, if there are 8 jet nozzles 342 and the circumferential angle between adjacent jet nozzles is 45 degrees, the jet from the jet nozzle 342 at the 0-degree position will accurately impact the flow surface of one of the guide vanes 62, while the jet from the jet nozzle at the 90-degree position will impact the flow surface of another guide vane 62. As the guide vane 62 rotates, there will be a continuous connection where the first vane just leaves the jet range and the next vane immediately enters the jet range. At this time, the jets from the other nozzles will also impact other guide vanes 62. In this way, the jets from at least two jet nozzles 342 hit different vanes at the same time, forming a continuous and uniform driving force, avoiding the jamming of the guide mechanism 6 caused by overload or uneven force on a single vane, and achieving smooth rotation.

[0046] The spiral upward flow guided by helical blades extends the contact path and time between the flocculant and wastewater compared to disordered water flow, improving mixing uniformity and further eliminating flocculation dead zones. The flow guiding mechanism 6, in conjunction with the primary dosing component 34 and the secondary dosing component 35, achieves precise matching between the dosing area and the flow guiding area, allowing the flocculant to fully diffuse within the corresponding flow region, enhancing the targeted capture of fine crystals and suspended solids. Furthermore, by relying on the jet nozzle 342 to drive the flow guiding mechanism 6, no additional motors or other drive components are required, simplifying the structure, reducing energy consumption, and preventing the failure of additional power components under high-temperature conditions.

[0047] Preferably, each guide vane 62 has multiple guide grooves 621 on its flow-bearing surface, and these grooves 621 are evenly arranged along the extension direction of the guide vane 62. Since the output end of the jet nozzle 342 faces the flow-bearing surface of the guide vane 62, the jet directly impacts the guide grooves 621 on the flow-bearing surface. The multiple guide grooves 621 are arranged along the extension trajectory of the vane, which on the one hand can concentrate the impact force of the jet to the vane, prevent the jet from slipping off the vane surface, maximize the conversion of the jet impact force into the rotational driving force of the guide mechanism 6, reduce energy loss and enhance the driving torque; on the other hand, the diversion effect of the guide grooves 621 allows the flocculant to diffuse into the water flow along the groove, avoiding excessively high local flocculant concentrations.

[0048] In a specific implementation of the present invention, the liquid flocculant in the drug storage device 2 is continuously stirred by the stirring component 22 to avoid sedimentation and stratification, maintain uniform concentration, and is quantitatively delivered to the liquid delivery pipe 31 by the pump body 23. The start-up, shutdown and flow rate of the pre-dosing pipe 33, the primary dosing component 34 and the secondary dosing component 35 are precisely controlled by the solenoid valves 38 on each dispensing pipe 32.

[0049] The flocculant enters the inlet pipe 15 of the fluidized bed 1 through the pre-dosing pipe 33, and mixes with the sewage in advance to form micro flocs. The mixed water flows through the water distribution head 131 of the bottom water distribution plate 13 and is evenly distributed to the bottom section of the bed. At the same time, the flocculant enters the primary dosing component 34 and the secondary dosing component 35 respectively, and is distributed to the jet nozzles 342 that are evenly arranged in a staggered manner in the circumferential / axial direction through the spiral dosing pipe 341. The jet nozzles are constrained by the connecting pipe 14 that is inclined at 15 to 25 degrees, and are precisely sprayed into the bed to form a multi-directional and multi-height diffused flow. At this time, the guide blades 62 of the first guide group 61 and the second guide group 62, which are set accordingly for jet impact, are designed with the number of blades matching the nozzle and the same spiral angle to ensure that at least two jets act on different blades at the same time, thereby driving the guide mechanism 6 to rotate smoothly. The rotating spiral blades drive the water flow in the bed to form a spiral upward flow. With the diversion and vortex effect of the blade guide groove 621, the flocculant and sewage are fully mixed, and the flocculant is guided to diffuse throughout the area.

[0050] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present invention specification has recorded each combined embodiment and can support different combined embodiments.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flocculant dosing device for solid-liquid separation, applied to a fluidized bed, characterized in that, include: The system comprises a flocculant storage mechanism, a multi-stage dosing mechanism, and a flow guiding mechanism. The flocculant storage mechanism stores liquid flocculant, and its output end is connected to the multi-stage dosing mechanism via a pump. The multi-stage dosing mechanism includes a pre-dosing pipeline, a primary dosing assembly, and a secondary dosing assembly. The output end of the pre-dosing pipeline is connected to the fluidized bed inlet pipe. The primary and secondary dosing assemblies are spaced apart and fitted into the lower part of the fluidized bed, enabling them to inject flocculant into the fluidized bed in a multi-point distributed injection manner. The flow guiding mechanism is rotatably disposed inside the fluidized bed and can be driven to rotate by the flocculant jets ejected from the multi-stage dosing unit.

2. The flocculant dosing device for solid-liquid separation according to claim 1, characterized in that, The primary dosing assembly has the same structure as the secondary dosing assembly. The primary dosing assembly includes a dosing tube and multiple jet nozzles. The dosing tube has a spiral structure and is wound around the outside of the fluidized bed. The multiple jet nozzles are staggered and evenly arranged along the spiral trajectory of the dosing tube. The output end of each jet nozzle extends through the side wall of the fluidized bed toward the direction close to the flow guiding mechanism.

3. The flocculant dosing device for solid-liquid separation according to claim 2, characterized in that, The spiral angle of the drug delivery tube is 5 to 15 degrees, and the number of jet nozzles is eight or ten. When the number of jet nozzles is eight, the circumferential angle between two adjacent jet nozzles is 45 degrees. When the number of jet nozzles is ten, the circumferential angle between two adjacent jet nozzles is 36 degrees.

4. The flocculant dosing device for solid-liquid separation according to claim 2, characterized in that, The flow guiding mechanism corresponds to the primary dosing assembly and the secondary dosing assembly. The flow guiding mechanism includes a shaft, a damping disk, and multiple flow guiding blades. The shaft is coaxially rotatably disposed within the fluidized bed. The damping disk is fixed to the top outer side of the fluidized bed, and the top end of the shaft passes through the damping disk and is frictionally connected to the damping disk. The number of multiple flow guiding blades is the same as the number of multiple jet nozzles, and they are spirally arranged around the outside of the shaft. The helix angle of the multiple flow guiding blades is consistent with the helix angle of the dosing tube, and the output ends of the multiple jet nozzles face the flow-receiving surface of the multiple flow guiding blades.

5. The flocculant dosing device for solid-liquid separation according to claim 4, characterized in that, Each of the guide vanes has multiple guide grooves on its flow-carrying surface, and these multiple guide grooves are evenly arranged along the extension direction of the guide vane.

6. The flocculant dosing device for solid-liquid separation according to claim 1, characterized in that, The bottom of the fluidized bed is equipped with a water distribution plate, and the water inlet pipe of the fluidized bed is connected to the water distribution plate.

7. The flocculant dosing device for solid-liquid separation according to claim 1, characterized in that, A liquid delivery pipe is provided on one side of the fluidized bed, and one end of the liquid delivery pipe is connected to the drug storage mechanism; the pre-dosing pipeline, the primary dosing assembly and the secondary dosing assembly are respectively connected to the liquid delivery pipe through the liquid distribution pipe.

8. The flocculant dosing device for solid-liquid separation according to claim 7, characterized in that, Each of the dispensing pipes is equipped with a solenoid valve, and the distribution ratio of the pre-dosing pipeline, the primary dosing component, and the secondary dosing component to the total dosing amount is 2:5:

3.

9. The flocculant dosing device for solid-liquid separation according to claim 2, characterized in that, The fluidized bed includes an inner cylinder and an outer cylinder, which are fixedly connected by multiple connecting pipes. The first end of each connecting pipe is connected to the inside of the inner cylinder, and the second end extends downward at an angle and passes through the outer cylinder to communicate with the outside. Multiple jet nozzles are installed inside the multiple connecting pipes and are sealed to the connecting pipes.

10. The flocculant dosing device for solid-liquid separation according to claim 9, characterized in that, Multiple connecting elbows are provided between the fluidized bed and the drug delivery pipe. Each connecting elbow is connected to the corresponding drug delivery pipe and the connecting pipe at both ends via a union joint, so that the two ends of the connecting elbow are connected to the drug delivery pipe and the jet nozzle respectively.

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