Phosphorus recovery crystallization reactor

Abstract

The application relates to the technical field of water treatment equipment, in particular to a phosphorus recovery crystallization reactor. A medicament adding assembly comprises a bottom disc, a cover plate fixed to the top of the bottom disc and a feeding hopper. A water inlet pipe head is sleeved to the right side of the front wall of the bottom disc, and a water outlet pipe head is sleeved to the bottom surface of the bottom disc. A plurality of arc-shaped grooves are arranged on the inner edge of the C-shaped groove on the outer edge of the top surface of the bottom disc in the circumferential direction. Stirring mechanisms are respectively arranged at the corresponding positions of the arc-shaped grooves in a rotating mode. The feeding hopper comprises a bucket-shaped shell and a cylindrical shell butted to the bottom end of the bucket-shaped shell. The cover plate is provided with a bushing. The output end of a water pump is connected with the water inlet pipe head. A connecting pipe is butted to the water outlet pipe head, and the bottom end of the connecting pipe is sleeved to the sidewall of the bottom end of a tank body. A crystal recovery assembly comprises an inverted conical shell butted to the bottom end of the tank body, an inclined shell sleeved to the bottom end of the inverted conical shell, a plurality of rollers, a flexible filter screen wrapped outside the rollers, a motor for driving the rollers to rotate and a discharge hopper connected to the bottom surface of the top end of the inclined shell. The phosphorus can be efficiently recovered during water treatment.

Description

Technical Field

[0001] This invention relates to the field of water treatment equipment technology, specifically to a phosphorus recovery crystallization reactor. Background Technology

[0002] Phosphorus is a major contributor to eutrophication in water bodies, but it is also an essential resource for production and daily life. Many industrial and agricultural processes generate large amounts of wastewater containing high concentrations of phosphorus, such as livestock and poultry farming wastewater and fertilizer production wastewater. Therefore, how to effectively recover phosphorus from wastewater during water treatment is an important issue.

[0003] In water treatment, using chemical methods to precipitate phosphorus as phosphate is an effective method for phosphorus removal from wastewater, and it also allows for the recovery of phosphorus resources. However, current phosphorus recovery methods mostly employ mechanical stirring, which significantly disturbs the crystallization process. Furthermore, the recovered phosphorus products tend to adhere to the paddles, reducing stirring efficiency and making it difficult to recover the phosphorus products. Some reactors use full aeration air stirring, but this is energy-intensive, and current air stirring methods generally suffer from low efficiency in separating the water, gas, and solid phases. In addition, current reactors discharge a large amount of water along with the phosphorus-containing products, resulting in excessively high water content in the phosphorus-containing products, increasing the workload of subsequent treatment, and thus affecting the efficiency of phosphorus recovery during water treatment. Summary of the Invention

[0004] The purpose of this invention is to provide a phosphorus recovery crystallization reactor to solve the problem of low phosphorus recovery efficiency in water treatment in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a phosphorus recovery crystallization reactor, comprising a tank, a base frame fixed to the bottom end of the tank, a drain outlet at the top of the side wall of the tank, a reagent addition assembly comprising a chassis, a cover plate fixed to the top of the chassis, and a feed hopper, an inlet pipe head tangentially fitted to the right side of the front wall of the chassis, an outlet pipe head fitted to the front left side of the bottom surface of the chassis, a C-shaped groove with two ends corresponding to the rear end of the inlet pipe head and the top end of the outlet pipe head respectively on the outer edge of the top surface of the chassis, a plurality of arc-shaped grooves circumferentially provided on the inner edge of the C-shaped grooves, and a stirring mechanism with a central shaft extending vertically rotatably mounted at the corresponding positions of the arc-shaped grooves, the feed hopper comprising a hopper-shaped shell and a fixed docking point. At the bottom of the bucket-shaped shell, the cover plate has an insertion hole corresponding to the right end of the C-shaped groove, which matches the bottom of the cylindrical shell; the output end of the water pump is connected to the front end of the inlet pipe; the top end of the connecting pipe is connected to the bottom end of the outlet pipe, and the bottom end of the connecting pipe is sleeved on the side wall of the bottom end of the tank; the crystal recycling assembly includes an inverted conical shell with its top end connected to the bottom end of the tank, an inclined shell with its bottom top surface sleeved on the bottom end of the inverted conical shell, multiple rollers with their front and rear ends respectively rotatably sleeved on the front and rear walls of the inclined shell, a flexible filter screen wrapped around the outside of the rollers and connected end to end, a motor driving the rollers to rotate, and a discharge hopper connected to the bottom surface of the top end of the inclined shell.

[0006] Preferably, a support plate with its top tip tilted outward is fixed to the bottom surface of the inclined housing cavity at a position corresponding to the lower side of the top opening of the discharge hopper, and a brush that contacts the surface of the flexible filter screen is fixed to the top of the support plate.

[0007] Preferably, the stirring mechanism includes a vertical shaft with its bottom end rotatably sleeved at the center of the bottom surface of the arc-shaped groove, and a plurality of plates and grid plates that are radially fixed to the outer peripheral wall of the vertical shaft and whose rotating outer contours are respectively tangent to the outer side wall of the inner cavity of the C-shaped groove, wherein the plates and grid plates are alternately spaced.

[0008] Preferably, the cover plate is fitted with an outer bushing that rotatably engages with the vertical shaft near its top end, the cover plate has a central bushing fitted at its center, the central bushing is rotatably fitted with a central gear, and the top end of the vertical shaft is fixedly fitted with an outer gear that meshes with the central gear.

[0009] Preferably, a rotating feeding component is rotatably mounted at the bottom of the inner cavity of the cylindrical shell, and a side groove is provided on the side wall of the cylindrical shell near the bottom end. The peripheral gear corresponding to the cylindrical shell meshes with the rotating feeding component through the side groove for transmission.

[0010] Preferably, the rotating feeding component includes a ring body rotatably fitted onto the bottom end of the inner cavity of the cylindrical shell, an outer gear ring fixed to the top surface of the ring body and meshing with the corresponding peripheral gear, and a spiral blade with its bottom outer edge fixed to the inner circumferential wall of the outer gear ring.

[0011] Preferably, a top cover is detachably and fixedly fitted to the top of the bucket-shaped shell.

[0012] Preferably, a protective cover is fixedly connected to the outer edge of the top surface of the cover plate. The top surface of the protective cover is provided with a sleeve hole that matches the cylindrical shell. A fixing ring is fixed to the outer peripheral wall of the cylindrical shell at a position corresponding to the top surface of the protective cover. The fixing ring is fixedly connected to the top surface of the protective cover with screws.

[0013] Preferably, a guide tube is provided in the middle of the inner cavity of the tank. The guide tube includes an outer cylinder extending vertically along the center of the inner cavity of the tank, a bracket fixedly connected between the outer peripheral wall of the outer cylinder and the inner peripheral wall of the tank, an inner cylinder located at the bottom center of the inner cavity of the outer cylinder and whose bottom end is fixedly connected to the output end of the connecting pipe, and a support rod fixedly connected between the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder.

[0014] Preferably, an annular overflow groove is fixedly connected to the inner peripheral wall of the tank near the top, and the inner end of the drain outlet corresponds to the bottom surface of the inner cavity of the annular overflow groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The present invention relates to a phosphorus recovery crystallization reactor in which a reagent addition component is used to fully mix with the reagent in the early stage of wastewater treatment, so that phosphorus in the wastewater can crystallize and precipitate in the form of phosphate in the tank; and the crystals in the wastewater in the tank are collected efficiently by a filter screen with a "conveyor belt" structure, thereby achieving efficient recovery of phosphorus from the wastewater. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0018] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A;

[0019] Figure 3 This is an exploded structural diagram of the pharmaceutical additive component of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the chassis of the present invention;

[0021] Figure 5 This is a three-dimensional structural diagram of the stirring mechanism of the present invention;

[0022] Figure 6 This is a three-dimensional structural diagram of the cover plate of the present invention;

[0023] Figure 7 This is an exploded structural diagram of the feed hopper of the present invention;

[0024] Figure 8 This is a three-dimensional structural diagram of the bucket-shaped shell of the present invention;

[0025] Figure 9 This is a three-dimensional structural diagram of the rotating feeder of the present invention;

[0026] Figure 10 This is a three-dimensional structural diagram of the protective cover of the present invention;

[0027] Figure 11 This is an exploded structural diagram of the crystal recycling component of the present invention;

[0028] Figure 12 This is a three-dimensional structural diagram of the guide tube of the present invention.

[0029] In the diagram: 1-Tank body; 1.1-Annular overflow trough; 1.2-Drain outlet; 1.3-Base frame;

[0030] 2-Reagent Addition Component; 2.1-Chassis; 2.1.1-C-shaped Groove; 2.1.2-Arc-shaped Groove; 2.1.3-Inlet Pipe; 2.1.4-Outlet Pipe; 2.2-Stirring Mechanism; 2.2.1-Vertical Shaft; 2.2.2-Plate; 2.2.3-Grid Plate; 2.3-Cover Plate; 2.3.1-Insertion Hole; 2.3.2-Central Bushing; 2.3.3-Outer Bushing; 2.4-Outer Peripheral 2.5-Central gear; 2.6-Feed hopper; 2.6.1-Hopper-shaped shell; 2.6.1.1-Cylindrical shell; 2.6.1.2-Side groove; 2.6.1.3-Fixing ring; 2.6.2-Rotating feeder; 2.6.2.1-Ring body; 2.6.2.2-External gear ring; 2.6.2.3-Helical blade; 2.6.3-Top cover; 2.7-Guard cover; 2.7.1-Sleeve hole;

[0031] 3-Water pump;

[0032] 4-Connecting pipe;

[0033] 5-Crystal recovery assembly; 5.1-Inverted conical shell; 5.2-Inclined shell; 5.3-Roller; 5.4-Flexible filter screen; 5.5-Motor; 5.6-Discharge hopper; 5.7-Support plate; 5.8-Brush;

[0034] 6-Guide tube; 6.1-Outer cylinder; 6.2-Inner cylinder; 6.3-Support; 6.4-Support rod. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-12 The present invention provides a technical solution, a phosphorus recovery crystallization reactor, wherein a base frame 1.3 is fixed at the bottom end of the tank body 1, and a drain outlet 1.2 is provided at the top of the side wall of the tank body 1. An annular overflow groove 1.1 is fixedly connected to the inner peripheral wall of the tank body 1 near the top end, and the inner end of the drain outlet 1.2 corresponds to the bottom surface of the inner cavity of the annular overflow groove 1.1.

[0037] The reagent addition assembly 2 includes a chassis 2.1, a cover plate 2.3 fixed to the top of the chassis 2.1, and a feed hopper 2.6. A water inlet pipe head 2.1.3 is tangentially fitted onto the right side of the front wall of the chassis 2.1, and a water outlet pipe head 2.1.4 is fitted onto the front left side of the bottom surface of the chassis 2.1. The outer edge of the top surface of the chassis 2.1 has a C-shaped groove 2.1.1 with two ends corresponding to the rear end of the water inlet pipe head 2.1.3 and the top end of the water outlet pipe head 2.1.4, respectively. The C-shaped groove 2.1.1 contains… The circumferential edge is provided with multiple arc-shaped grooves 2.1.2. A stirring mechanism 2.2 with a central shaft extending vertically is rotatably installed at the corresponding position of the arc-shaped grooves 2.1.2. The feed hopper 2.6 includes a hopper-shaped shell 2.6.1 and a cylindrical shell 2.6.1.1 fixedly connected to the bottom end of the hopper-shaped shell 2.6.1. The cover plate 2.3 has an insertion hole 2.3.1 at the right end of the C-shaped groove 2.1.1, which matches the bottom end of the cylindrical shell 2.6.1.1. The stirring mechanism 2.2 includes a vertical shaft 2.2.1 with its bottom end rotatably connected to the center of the bottom surface of the arc-shaped groove 2.1.2, and multiple plates 2.2.2 and grid plates 2.2.3 fixed radially to the outer peripheral wall of the vertical shaft 2.2.1 and whose rotating outer contours are tangent to the outer side wall of the inner cavity of the C-shaped groove 2.1.1. The plates 2.2.2 and grid plates 2.2.3 are alternately arranged. A peripheral bushing 2.3.3 is fitted onto the cover plate 2.3, which rotatably engages with the vertical shaft 2.2.1 near its top. A central bushing 2.3.2 is fitted around the center of the cover plate 2.3, and a central gear 2.5 is rotatably fitted onto the central bushing 2.3.2. A peripheral gear 2.4, meshing with the central gear 2.5, is fixedly fitted onto the top of the vertical shaft 2.2.1. A rotating feeding component 2.6.2 is rotatably fitted onto the bottom of the inner cavity of the cylindrical shell 2.6.1.1. A side groove 2.6.1.2 is formed on the side wall near the bottom of the cylindrical shell 2.6.1.1. The peripheral gear 2.4 corresponding to the cylindrical shell 2.6.1.1 engages with the rotating feeding component 2.6.2 through the side groove 2.6.1.2 for transmission. The rotating feeder 2.6.2 includes a ring 2.6.2.1 rotatably fitted onto the bottom of the inner cavity of the cylindrical shell 2.6.1.1, an outer gear ring 2.6.2.2 fixed to the top surface of the ring 2.6.2.1 and meshing with the corresponding peripheral gear 2.4, and a helical blade 2.6.2.3 with its bottom outer edge fixed to the inner circumferential wall of the outer gear ring 2.6.2.2. The diameter of the inner cavity at the top of the cylindrical shell 2.6.1.1 is the same as the diameter of the inner cavity of the outer gear ring 2.6.2.2, and a rotating sealing structure is provided between the top surface of the outer gear ring 2.6.2.2 and the cylindrical shell 2.6.1.1. A top cover 2.6.3 is detachably and fixedly fitted onto the top of the bucket-shaped shell 2.6.1. The outer edge of the protective cover 2.7 is bolted to the outer edge of the cover plate 2.3 and the outer edge of the top of the chassis 2.1.The top surface of the protective cover 2.7 is provided with a matching sleeve hole 2.7.1 that fits into the cylindrical shell 2.6.1.1. The outer peripheral wall of the cylindrical shell 2.6.1.1 is fixed with a fixing ring 2.6.1.3 at a position corresponding to the top surface of the protective cover 2.7. The fixing ring 2.6.1.3 is fixedly connected to the top surface of the protective cover 2.7 with screws.

[0038] The output end of water pump 3 is connected to the front end of water inlet pipe 2.1.3.

[0039] The top end of the connecting pipe 4 is connected to the bottom end of the water outlet pipe head 2.1.4, and the bottom end of the connecting pipe 4 is sleeved on the bottom side wall of the tank body 1;

[0040] The crystal recycling assembly 5 includes an inverted conical shell 5.1 with its top end connected to the bottom end of the tank 1, an inclined shell 5.2 with its bottom end top surface sleeved on the bottom end of the inverted conical shell 5.1, multiple rollers 5.3 with their front and rear ends respectively rotatably sleeved on the front and rear walls of the inclined shell 5.2, a flexible filter screen 5.4 wrapped around the outside of the rollers 5.3 and connected end to end, a motor 5.5 driving the rollers 5.3 to rotate, and a discharge hopper 5.6 connected to the bottom surface of the top end of the inclined shell 5.2. A support plate 5.7 with its top end tilted outward is fixed to the bottom surface of the inner cavity of the inclined shell 5.2, corresponding to the lower side of the top opening of the discharge hopper 5.6. A brush 5.8 with its top end fixed to the top of the support plate 5.7, contacting the surface of the flexible filter screen 5.4. A sealing structure is provided between the front and rear walls of the inner cavity of the inclined shell 5.2 and the edge of the flexible filter screen 5.4, and an air vent valve is installed on the bottom surface of the bottom end of the inclined shell 5.2.

[0041] The guide tube 6 includes an outer tube 6.1 extending vertically along the center of the inner cavity of the tank body 1, a bracket 6.3 fixedly connected between the outer peripheral wall of the outer tube 6.1 and the inner peripheral wall of the tank body 1, an inner tube 6.2 located at the bottom center of the inner cavity of the outer tube 6.1 and fixedly connected to the output end of the connecting pipe 4, and a support rod 6.4 fixedly connected between the outer peripheral wall of the inner tube 6.2 and the inner peripheral wall of the outer tube 6.1.

[0042] In summary, the input end of the water pump 3 is connected to the wastewater pool. The wastewater is pumped into the C-shaped groove 2.1.1 by the water pump 3 through the inlet pipe 2.1.3. After flowing through the C-shaped groove 2.1.1, the wastewater is discharged into the bottom of the inner cavity of the tank 1 through the outlet pipe 2.1.4 and the connecting pipe 4.

[0043] When wastewater flows through the C-shaped groove 2.1.1, it exerts an impact force on the plate 2.2.2, causing the stirring mechanism 2.2 to rotate. The rotation of the stirring mechanism 2.2 drives the central gear 2.5 to rotate via the outer gear 2.4, achieving synchronous stirring. The outer gear 2.4 at the far right front drives the rotating feeder 2.6.2.2 to rotate within the cylindrical shell 2.6.1.1 via the outer gear ring 2.6.2.2. The spiral blades 2.6.2.3 push the reagent added from the hopper-shaped shell 2.6.1 downwards into the C-shaped groove 2.1.1. Combined with the synchronous stirring action of multiple stirring mechanisms 2.2, the reagent and wastewater are uniformly mixed, meaning the uniform addition of reagents is completed before the wastewater enters the tank 1.

[0044] The process of wastewater being discharged upward from the inner cylinder 6.2 will promote the formation of circulation of wastewater in the tank 1 between the inner and outer cavities of the outer cylinder 6.1, further mixing the wastewater and the reagent evenly in the tank.

[0045] The added agent causes phosphorus in the wastewater to crystallize and precipitate in the form of phosphate. Under its own weight, the crystals gather downwards at the bottom of the inner cavity of the inverted conical shell 5.1 and the bottom of the inner cavity of the inclined shell 5.2, and finally adhere to and accumulate on the surface of the flexible filter screen 5.4.

[0046] The motor 5.5, roller 5.3, and flexible filter screen 5.4 form a "conveyor belt" structure. When the flexible filter screen 5.4 rotates to the position corresponding to the brush 5.8, the crystals attached to the surface of the flexible filter screen 5.4 are swept away and fall into the discharge hopper 5.6, from which they are discharged downwards. This completes the efficient recovery process of phosphorus from the wastewater.

[0047] It should be noted that in this article, relational terms such as first and second are only used to refer to...

[0048] Distinguishing one entity or operation from another does not necessarily require or imply any such actual relationship or order between those entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A phosphorus recovery crystallization reactor, comprising a tank (1), wherein a base frame (1.3) is fixed to the bottom end of the tank (1), and a drain outlet (1.2) is provided at the top of the side wall of the tank (1), characterized in that, Also includes: A reagent addition assembly (2) includes a chassis (2.1), a cover plate (2.3) fixed to the top of the chassis (2.1), and a feed hopper (2.6). A water inlet pipe (2.1.3) is tangentially fitted onto the right side of the front wall of the chassis (2.1), and a water outlet pipe (2.1.4) is fitted onto the front left side of the bottom surface of the chassis (2.1). The outer edge of the top surface of the chassis (2.1) has C-shaped grooves at both ends corresponding to the rear end of the water inlet pipe (2.1.3) and the top end of the water outlet pipe (2.1.4), respectively. 2.1.1), the inner edge of the C-shaped groove (2.1.1) is provided with multiple arc-shaped grooves along the circumferential direction. 2.1.2), the arc-shaped groove (2.1.2) is rotatably mounted with a stirring mechanism (2.2) extending vertically along its central shaft at the corresponding position. The feed hopper (2.6) includes a hopper-shaped shell (2.6.1) and a cylindrical shell (2.6.1.1) fixedly connected to the bottom end of the hopper-shaped shell (2.6.1). The cover plate (2.3) corresponds to the C-shaped groove ( 2.1.1) An insertion hole (2.3.1) is provided at the right end to match the bottom end of the cylindrical shell (2.6.1.1), and a rotating feeding component (2.6.2) is rotatably fitted at the bottom of the inner cavity of the cylindrical shell (2.6.1.1). Water pump (3), the output end of which is connected to the front end of the water inlet pipe (2.1.3); Connecting pipe (4), the top end of the connecting pipe (4) is connected to the bottom end of the water outlet pipe head (2.1.4), and the bottom end of the connecting pipe (4) is sleeved on the bottom side wall of the tank body (1); The crystal recycling assembly (5) includes an inverted conical shell (5.1) with its top end connected to the bottom end of the tank (1), an inclined shell (5.2) with its bottom top surface sleeved with the bottom end of the inverted conical shell (5.1), multiple rollers (5.3) with their front and rear ends respectively rotatably sleeved on the front and rear walls of the inclined shell (5.2), a flexible filter screen (5.4) wrapped around the outside of the rollers (5.3) and connected end to end, a motor (5.5) driving the rollers (5.3) to rotate, and a discharge hopper (5.6) connected to the bottom surface of the top end of the inclined shell (5.2).

2. The phosphorus recovery crystallization reactor according to claim 1, characterized in that: The bottom surface of the inclined shell (5.2) is fixed with a support plate (5.7) that is tilted outward at the bottom, corresponding to the position below the top opening of the discharge hopper (5.6). The top of the support plate (5.7) is fixed with a brush (5.8) that contacts the surface of the flexible filter screen (5.4).

3. The phosphorus recovery crystallization reactor according to claim 1, characterized in that: The stirring mechanism (2.2) includes a vertical shaft (2.2.1) whose bottom end is rotatably sleeved at the center of the bottom surface of the arc-shaped groove (2.1.2), and a rotating outer contour fixed radially to the outer peripheral wall of the vertical shaft (2.2.1) and respectively intersecting with the C-shaped groove (2.1.2). 2.1.1) Multiple plates (2.2.2) and grid plates (2.2.3) tangent to the outer walls of the inner cavity, wherein the plates (2.2.2) and the grid plates (2.2.3) are alternately spaced.

4. The phosphorus recovery crystallization reactor according to claim 3, characterized in that: The cover plate (2.3) is fitted with an outer bushing (2.3.3) that rotates and matches the vertical shaft (2.2.1) near the top. The cover plate (2.3) is fitted with a central bushing (2.3.2). The central bushing (2.3.2) is rotatably fitted with a central gear (2.5). The top of the vertical shaft (2.2.1) is fixedly fitted with an outer gear (2.4) that meshes with the central gear (2.5).

5. A phosphorus recovery crystallization reactor according to claim 4, characterized in that, The cylindrical shell (2.6.1.1) has a side groove (2.6.1.2) on its side wall near the bottom end. The peripheral gear (2.4) corresponding to the cylindrical shell (2.6.1.1) meshes with the rotating feeder (2.6.2) through the side groove (2.6.1.2).

6. A phosphorus recovery crystallization reactor according to claim 5, characterized in that: The rotating feeder (2.6.2) includes an annular body (2.6.2.1) rotatably fitted onto the bottom end of the inner cavity of the cylindrical shell (2.6.1.1), an outer gear ring (2.6.2.2) fixed to the top surface of the annular body (2.6.2.1) and meshing with the corresponding peripheral gear (2.4), and a spiral blade (2.6.2.3) with its bottom outer edge fixed to the inner circumferential wall of the outer gear ring (2.6.2.2).

7. A phosphorus recovery crystallization reactor according to claim 1, characterized in that: The top of the bucket-shaped shell (2.6.1) is detachably and fixedly fitted with a top cover (2.6.3).

8. A phosphorus recovery crystallization reactor according to claim 1, characterized in that: A protective cover (2.7) is fixedly connected to the outer edge of the top surface of the cover plate (2.3). The top surface of the protective cover (2.7) is provided with a sleeve hole that matches the cylindrical shell (2.6.1.1). 2.7.1), a fixing ring (2.6.1.3) is fixed on the outer peripheral wall of the cylindrical shell (2.6.1.1) at a position corresponding to the top surface of the protective cover (2.7), and the fixing ring (2.6.1.3) is fixedly connected to the top surface of the protective cover (2.7) with screws.

9. A phosphorus recovery crystallization reactor according to claim 1, characterized in that: The inner cavity of the tank (1) is provided with a guide tube (6). The guide tube (6) includes an outer cylinder (6.1) extending vertically along the center of the inner cavity of the tank (1), a bracket (6.3) fixedly connected between the outer peripheral wall of the outer cylinder (6.1) and the inner peripheral wall of the tank (1), an inner cylinder (6.2) located at the bottom center of the inner cavity of the outer cylinder (6.1) and fixedly connected to the output end of the connecting pipe (4), and a support rod (6.4) fixedly connected between the outer peripheral wall of the inner cylinder (6.2) and the inner peripheral wall of the outer cylinder (6.1).

10. A phosphorus recovery crystallization reactor according to claim 1, characterized in that: An annular overflow groove (1.1) is fixedly connected to the inner circumferential wall of the tank (1) near the top, and the inner end of the drain outlet (1.2) corresponds to the bottom surface of the inner cavity of the annular overflow groove (1.1).

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