A large-volume open integrated circulating agglomeration and granulation fluidized bed water treatment equipment

Abstract

The present invention provides a large-volume open-type integrated circulating agglomeration granulation fluidized bed water treatment equipment, including a tank body, wherein an inner cylinder, a middle cylinder and an outer cylinder are sequentially arranged in the tank body from the inside to the outside, and the bottom end of the middle cylinder is connected to a mixing cylinder with a closed bottom end; the position between the outer cylinder and the tank body above the top end of the middle cylinder is a water collection area; the internal cavity of the tank body below the bottom end of the outer cylinder and outside the closed mixing cylinder is a sludge concentration area; the position between the outer cylinder and the tank body below the top end of the middle cylinder is a separation area; the top of the separation area is connected to the water collection area; and the bottom of the separation area is connected to the sludge concentration area. The equipment of the present invention adopts a four-layer structure in which the inner cylinder, the middle cylinder, the outer cylinder and the tank body are coaxially arranged, and the separation area is arranged between the outer cylinder and the tank body, and the top of the tank body is open, which solves the problems of complex structure in the separation area at the top and poor adaptability to water quality and water quantity in the prior art, and further improves the economy of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, relates to a circulating agglomeration granulation fluidized bed, and particularly relates to a large-water-volume open integrated circulating agglomeration granulation fluidized bed water treatment device. Background Art

[0002] The separation of suspended solids in water is a hot topic in the water treatment field. With the continuous development of the economy and society and the continuous improvement of people's living standards, the requirements for suspended solids removal in water are constantly increasing, whether in industrial water treatment or residential and wastewater treatment. Furthermore, with the ever-changing water environment, the content of suspended solids in all types of water is also increasing. The upgrading and development of solid-liquid separation water treatment systems is an inevitable development trend in this field. Currently, water treatment technologies and equipment based on suspended solid-liquid separation are widely used. Typical devices include the Actiflo clarifier from Veolia in France and the DensaDeg high-density clarifier from Degremont in France. While these water treatment systems achieve significant water purification results in actual operation, they also present numerous challenges, such as large footprints and numerous ancillary equipment. Currently, most domestic water plants use a sedimentation and concentration process, where the supernatant is discharged or recycled after solid-liquid separation, and the sludge is discharged after dewatering. This method suffers from low efficiency, high investment, large footprint, and high operating costs.

[0003] A Chinese invention patent application with publication number CN112239257A discloses a highly efficient solid-liquid separation and highly efficient integrated mud-water separation device. The system comprises a reaction zone, a separation zone, and a sludge concentration zone. The separation zone is provided with a suspended layer filtration solid-liquid separation device. The suspended layer filtration solid-liquid separation device is divided into two parts, the upper part being a static suspended layer and the lower part being an agitated suspended layer. The static suspended layer is filled with floating lightweight suspended beads, and the agitated suspended layer is provided with a filter layer stirring blade. The reaction zone is provided with an inner cylinder and a middle cylinder. The tank body, middle cylinder, and inner cylinder are coaxially arranged in sequence from the outside to the inside. The bottom end of the inner cylinder is open, and the bottom end of the middle cylinder is contracted inward near the bottom end of the inner cylinder, forming a reflux outlet slit between the bottom end of the inner cylinder and the contracted inner wall of the middle cylinder, which is used to generate local negative pressure, provide reflux power, and thus achieve cyclic granulation. The system has the ability to treat high-concentration suspended solids and medium-concentration wastewater. In actual operation, under high water volume conditions, the suspended beads in the separation zone require regular replacement and cleaning, otherwise the effluent quality will be affected. Furthermore, the agitation device in the separation zone increases system energy consumption and operating costs. This device is constructed of a steel tank. To ensure economical transportation and installation, the tank diameter should not be too large, and the slope of the conical bottom of the tank should not be too steep. A scraper is installed at the bottom of the sludge concentration zone in continuous operation. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a large-water-volume open integrated circulating agglomeration granulation fluidized bed water treatment equipment to solve the technical problem of poor operating economy of the closed system in the existing technology under large water volume conditions.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A large-water-volume open-type integrated circulating agglomeration and granulation fluidized bed water treatment equipment comprises a tank body, wherein the tank body is sequentially provided with an inner cylinder, a middle cylinder and an outer cylinder from the inside to the outside, and the inner cylinder, the middle cylinder, the outer cylinder and the tank body are all coaxially fixedly arranged; the bottom end of the middle cylinder is open, and the bottom end of the middle cylinder is connected to a mixing cylinder with a closed bottom end.

[0007] The bottom end of the tank body is closed and the top end is open. The position between the outer cylinder and the tank body above the top end of the middle cylinder is the water collection area; the internal cavity of the tank body below the bottom end of the outer cylinder and outside the closed mixing cylinder is the sludge concentration area.

[0008] The bottom end of the outer cylinder is open to form a separation water inlet. The position between the outer cylinder and the tank body below the top of the middle cylinder is the separation zone; the top of the separation zone is connected to the water collection area; the bottom of the separation zone is connected to the sludge concentration area.

[0009] A water outlet weir is provided on the inner wall of the tank body in the water collection area, and a water collecting trough is provided on the top outer wall of the tank body. Clean water enters the water collecting trough after passing through the water outlet weir.

[0010] The present invention also has the following technical features:

[0011] Furthermore, the bottom end of the inner cylinder is open, and the inner cylinder is a granulation fluidization zone; the top end of the inner cylinder is open, and the top end of the middle cylinder is higher than the top end of the inner cylinder, forming a reflux water inlet, and the inner cylinder and the middle cylinder are between a circulation zone; the top end of the middle cylinder is open, and the top end of the outer cylinder is higher than the top end of the middle cylinder, forming a sludge sedimentation outlet, and the sludge sedimentation zone is between the middle cylinder and the outer cylinder, and the bottom of the sludge sedimentation zone is connected to the sludge concentration zone; the mixing cylinder is a mixing zone, and the top of the mixing zone is connected to the granulation fluidization zone and the circulation zone.

[0012] Furthermore, the bottom end of the middle tube is close to the bottom end of the inner tube and contracts inward to form a contraction inner wall, and a reflux water outlet slit is formed between the bottom end of the inner tube and the contraction inner wall of the middle tube, which is used to form a local negative pressure and provide reflux power; the bottom end of the contraction inner wall of the middle tube is connected to the mixing tube, and the reflux water outlet slit is connected to the top of the mixing zone.

[0013] The outer wall of the tank body is provided with a sludge discharge pipe communicating with the sludge concentration area in the tank body.

[0014] The inner diameter of the mixing cylinder is smaller than or equal to the inner diameter of the inner cylinder.

[0015] Furthermore, the top end of the outer cylinder is closed, and the top end of the outer cylinder is higher than the top end of the tank body; a stirring drive motor is installed at the closed top end of the outer cylinder, and the stirring drive motor drives the stirring shaft.

[0016] As a preferred solution, the stirring shaft passes through the inner cylinder and extends into the mixing cylinder; a stirring blade is installed on the stirring shaft in the inner cylinder, and the bottom end of the stirring shaft uses a water distributor fixedly installed in the mixing cylinder as a rotating support seat, and the rotation of the stirring shaft drives the stirring blade to rotate.

[0017] Further preferably, the bottom end of the mixing cylinder is connected to a water inlet pipe, and the water inlet pipe passes through the side wall of the tank body and extends to the outside of the tank body.

[0018] Further preferably, the bottom of the tank body is a conical bucket bottom, the bottom of the mixing drum is a conical bucket bottom, the tank body is made of reinforced concrete, and the tank body is fixed on the foundation.

[0019] As another preferred embodiment, the stirring shaft passes through the inner cylinder and the mixing cylinder in sequence and extends into the bottom of the tank body; the stirring shaft in the inner cylinder is provided with stirring blades, and the stirring shaft uses a water distributor fixedly installed in the mixing cylinder as a rotating support seat, and the bottom end of the stirring shaft is connected to a scraper installed at the bottom of the tank body, and the rotation of the stirring shaft drives the stirring blades and the scraper to rotate.

[0020] Further preferably, the bottom end of the mixing drum is connected to a water inlet pipe, and the water inlet pipe passes through the side wall of the tank body and extends to the outside of the tank body; a sliding sealing sleeve is provided between the bottom of the water inlet pipe and the stirring shaft.

[0021] Further preferably, the bottom of the tank body is an arc-shaped bottom, the bottom of the mixing barrel is a conical bucket bottom, the tank body is made of steel material, and the tank body is installed on a base frame.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] (I) The equipment of the present invention utilizes a four-layer structure consisting of an inner cylinder, a middle cylinder, an outer cylinder, and a tank body arranged coaxially. The separation zone is located between the outer cylinder and the tank body, with the top of the tank body open. This solves the problems of the existing top-located separation zone, such as complex structure and poor adaptability to water quality and quantity, further improving the economic efficiency of the system. The multi-cylinder structure of the present invention increases the hydraulic retention time of the system, effectively optimizes the sedimentation of fine particles, significantly reduces water turbidity and suspended solids in the separation zone, and achieves good removal efficiency under high water volume conditions.

[0024] (II) The tank of the present invention is open-top, and the system outlet is replaced by an overflow outlet instead of a top pipe. The suspended layer filtration solid-liquid separation device in the separation zone of the prior art system is eliminated, reducing the overall height of the equipment and the installation height. This also eliminates the need for regular replacement of suspended beads, reduces the workload of equipment installation and subsequent maintenance, makes operation simpler and more convenient, and reduces the equipment cost.

[0025] (III) This invention effectively utilizes the high density of particles. Fine particles in the raw water undergo agglomeration and flocculation process in the granulation zone, gradually forming spheres with a high effective density. Larger spherical particles, after passing through the inner drum, are directly transferred to the sludge concentration zone. Small particles that cannot be removed from the bottom are effectively removed through the sludge settling zone and separation zone. By eliminating the agitator blades in the separation zone, as in conventional technology, the energy consumption of the rotating motor is effectively reduced, further improving the economic benefits of the system.

[0026] (IV) The present invention has excellent treatment effects on various water qualities under various high-volume conditions. Based on the operating experience of existing technologies, when treating water with high organic matter content and low suspended solids density, the device of the present invention mainly operates by adding sand for granulation; when treating water with high dissolved organic matter content, the device mainly operates by pulverized carbon for granulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an open integrated circulating agglomeration and granulation fluidized bed water treatment equipment for reinforced concrete.

[0028] Figure 2 It is a structural diagram of an open integrated circulating agglomeration and granulation fluidized bed water treatment equipment for steel.

[0029] Figure 3 It is a schematic diagram of the overhead structure of the overflow weir and the water collection tank.

[0030] The meanings of the numbers in the figure are: 1-inner cylinder, 2-middle cylinder, 3-outer cylinder, 4-tank body, 5-mixing cylinder, 6-water collection area, 7-sludge concentration area, 8-separation water inlet, 9-separation area, 10-outlet weir, 11-water collection trough, 12-granulation fluidization area, 13-backflow water inlet, 14-circulation area, 15-sludge sedimentation outlet, 16-sludge sedimentation area, 17-mixing area, 18-contraction inner wall, 19-backflow outlet slit, 20-stirring drive motor, 21-stirring shaft, 22-stirring blade, 23-water distributor, 24-scraper, 25-water inlet pipe, 26-sliding sealing sleeve, 27-sludge discharge pipe, 28-base frame, 29-foundation.

[0031] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0032] It should be noted that, unless otherwise specified, all devices and components in the present invention are devices and components known in the prior art.

[0033] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0034] Example 1:

[0035] This embodiment provides a large water volume open integrated circulation agglomeration granulation fluidized bed water treatment equipment, such as Figure 1 and Figure 3 As shown, it includes a tank body 4, in which an inner cylinder 1, a middle cylinder 2 and an outer cylinder 3 are sequentially installed from the inside to the outside. The inner cylinder 1, the middle cylinder 2, the outer cylinder 3 and the tank body 4 are all coaxially fixed; the bottom end of the middle cylinder 2 is open, and the bottom end of the middle cylinder 2 is connected to a mixing cylinder 5 with a closed bottom end.

[0036] The bottom end of the tank body 4 is closed and the top end is open. The position between the outer cylinder 3 and the tank body 4 above the top end of the middle cylinder 2 is the water collection area 6; the internal cavity of the tank body 4 below the bottom end of the outer cylinder 3 and outside the closed mixing cylinder 5 is the sludge concentration area 7.

[0037] The bottom end of the outer tube 3 is open to form a separation water inlet 8. The position between the outer tube 3 and the tank body 4 below the top of the middle tube 2 is the separation zone 9; the top of the separation zone 9 is connected to the water collection area 6; the bottom of the separation zone 9 is connected to the sludge concentration area 7.

[0038] A water outlet weir 10 is provided on the inner wall of the tank body in the water collection area 6 , and a water collecting trough 11 is provided on the top outer wall of the tank body 4 . Clean water flows through the water outlet weir 10 and enters the water collecting trough 11 .

[0039] In this embodiment, preferably, the inner tube 1 , the middle tube 2 , the outer tube 3 and the tank body 4 are fixed respectively by connecting rings or ribs.

[0040] Preferably, in this embodiment, the top of the outlet weir 10 is lower than the top of the water collecting tank 11 .

[0041] As a specific scheme of this embodiment, the bottom end of the inner cylinder 1 is open, and the inner cylinder 1 is a granulation fluidization zone 12; the top end of the inner cylinder 1 is open, and the top end of the middle cylinder 2 is higher than the top end of the inner cylinder 1, forming a reflux water inlet 13, and a circulation zone 14 is between the inner cylinder 1 and the middle cylinder 2; the top end of the middle cylinder 2 is open, and the top end of the outer cylinder 3 is higher than the top end of the middle cylinder 2, forming a sludge sedimentation outlet 15, and a sludge sedimentation zone 16 is between the middle cylinder 2 and the outer cylinder 3, and the bottom of the sludge sedimentation zone 16 is connected to the sludge concentration zone 7; the mixing cylinder 5 is a mixing zone 17, and the top of the mixing zone 17 is connected to the granulation fluidization zone 12 and the circulation zone 14.

[0042] As a specific solution of this embodiment, the bottom end of the middle cylinder 2 is close to the bottom end of the inner cylinder 1 and contracts inward to form a contraction inner wall 18. A reflux outlet slit 19 is formed between the bottom end of the inner cylinder 1 and the contraction inner wall 18 of the middle cylinder 2 to form a local negative pressure and provide reflux power; the bottom end of the contraction inner wall 18 of the middle cylinder 2 is connected to the mixing cylinder 5, and the reflux outlet slit 19 is connected to the top of the mixing zone 17.

[0043] In this embodiment, the sludge particles in the granulation fluidization zone 12 in the inner tube 1 reach dynamic equilibrium under the action of the inlet water flow dynamics and their own gravity. Some of the sludge particles formed rise to the top of the inner tube 1 with the water flow, and circulate back to the circulation zone 14 before reaching the top of the middle tube 2.

[0044] In this embodiment, after the sludge particles in the inner tube 1, the middle tube 2 and the outer tube 3 reach dynamic equilibrium, some of the sludge particles fall into the sludge settling area 16, large sludge particles sink directly from the sludge settling area 16 to the sludge concentration area 7, and small sludge particles increase in particle size in the separation area 9 and then settle to the sludge concentration area 7.

[0045] As a preferred solution of this embodiment, a sludge discharge pipe 27 is provided on the outer wall of the tank body 4 and is connected to the sludge concentration area 7 in the tank body 4; when the sludge in the sludge concentration area 7 accumulates to a certain height, it is discharged through the sludge discharge pipe 27.

[0046] As a preferred solution of this embodiment, the inner diameter of the mixing cylinder 5 is smaller than or equal to the inner diameter of the inner cylinder 1 .

[0047] As a specific solution of this embodiment, the top of the outer cylinder 3 is closed, and the top of the outer cylinder 3 is higher than the top of the tank body 4; a stirring drive motor 20 is installed at the closed top of the outer cylinder 3, and the stirring drive motor 20 drives the stirring shaft 21.

[0048] As a preferred solution of this embodiment, the stirring shaft 21 passes through the inner tube 1 and extends into the mixing tube 5; a stirring blade 22 is installed on the stirring shaft 21 in the inner tube 1, and the bottom end of the stirring shaft 21 uses a water distributor 23 fixedly installed in the mixing tube 5 as a rotating support seat, and the rotation of the stirring shaft 21 drives the stirring blade 22 to rotate.

[0049] In this embodiment, the stirring blades 22 are installed at a certain distance from each other. The uppermost stirring blade 22 does not exceed the top of the inner tube 1, and the lowermost stirring blade 22 is just arranged at the position of the backflow water slit 19, which plays a role in strengthening the side wall and achieving the effect of mud and water separation.

[0050] In this embodiment, the water distributor 23 is preferably a common water distributor known in the prior art.

[0051] As a preferred solution of this embodiment, the bottom end of the mixing drum 5 is connected to the water inlet pipe 25 , and the water inlet pipe 25 passes through the side wall of the tank body 4 and extends to the outside of the tank body 4 .

[0052] As a preferred embodiment of this embodiment, the bottom of the tank body 4 is a conical bucket bottom, and the bottom of the mixing drum 5 is a conical bucket bottom. The tank body 4 is cast using reinforced concrete and is fixed to the foundation 29. In this embodiment, the height of the tank body 4 is preferably about 8 meters and the diameter is about 5 meters. Casting the tank body 4 using reinforced concrete can effectively reduce the production and transportation costs of the device, making operation simpler and more convenient, and reducing the cost.

[0053] In this embodiment, the diameter of the tank 4 can be flexibly adjusted to accommodate large water volumes. Furthermore, the slope of the conical bottom of the tank 4 can be adjusted to a relatively large degree, thereby eliminating the conventional scraper 24. This further simplifies the system structure and reduces costs. The conical bottom is located below the foundation 29, improving the system's thermal insulation performance.

[0054] When the equipment of the present invention is in use, fine sand / powdered carbon and other agents can be added to the raw water as needed. The raw water enters the mixing zone 17 in the mixing cylinder 5 in the tank body 4 through the water inlet pipe 25, and then enters the granulation fluidization zone 12 in the inner cylinder 1. Under the stirring of the stirring blades 22, the particles continue to rise, and when they reach the top of the inner cylinder 1, the particles turn over and enter the circulation zone 14 between the inner cylinder 1 and the middle cylinder 2.

[0055] When the muddy water circulates back to the reflux outlet slit 19, a local negative pressure is formed. The side wall strengthens the stirring effect, and the fine sand / powdered carbon is separated from the sludge nucleus. The sludge particles are then returned to the granulation fluidization zone 12 in the inner tube 1. This cycle continues until the height of the suspended layer reaches the top of the middle tube 2, and the large particles fall down and enter the sludge concentration zone 7 from the sludge settling zone 16 until they settle to the bottom of the tank body 4.

[0056] Some tiny sludge particles, after passing through sludge settling outlet 15, do not flow directly into sludge concentration zone 7 with the water flow. Instead, they continue to grow into larger particles in sludge settling zone 16 before entering sludge concentration zone 7. A small amount of ineffective sludge particles flow through sludge settling zone 16 and enter separation zone 9, where they continue to grow to a certain particle size before settling into sludge concentration zone 7. Any unsettled sludge particles rise through catchment zone 6 and are intercepted by outlet weir 10 there. The clean water enters sump 11 before being discharged.

[0057] During the entire process, the stirring drive motor 20 only drives the stirring blades 22 of the filter layer to rotate through the stirring shaft 21.

[0058] Example 2:

[0059] This embodiment provides a large water volume open integrated circulation agglomeration granulation fluidized bed water treatment equipment, such as Figure 2 and Figure 3 As shown, its main structure is the same as that of Example 1, and the only difference is that, compared with Example 1, this embodiment has the following differences.

[0060] As a preferred solution of this embodiment, the stirring shaft 21 passes through the inner tube 1 and the mixing tube 5 in sequence and extends into the bottom of the tank body 4; a stirring blade 22 is installed on the stirring shaft 21 in the inner tube 1, and the stirring shaft 21 uses a water distributor 23 fixedly installed in the mixing tube 5 as a rotating support seat. The bottom end of the stirring shaft 21 is connected to the scraper 24 installed at the bottom of the tank body 4, and the rotation of the stirring shaft 21 drives the stirring blade 22 and the scraper 24 to rotate.

[0061] As a preferred embodiment of this embodiment, the bottom end of the mixing drum 5 is connected to a water inlet pipe 25, which extends through the side wall of the tank body 4 to the outside of the tank body 4. A sliding sealing sleeve 26 is provided between the bottom of the water inlet pipe 25 and the agitator shaft 21. In this embodiment, the sliding sealing sleeve 26 is a sliding sealing sleeve commonly used in the art to prevent water leakage from the water inlet pipe 25.

[0062] As a preferred solution of this embodiment, the bottom of the tank body 4 is an arc bottom, the bottom of the mixing drum 5 is a conical bucket bottom, the tank body 4 is made of steel, and the tank body 4 is mounted on the base frame 28. In this embodiment, the height of the tank body 4 is preferably about 4m and the diameter does not exceed 2.5m.

[0063] When the device of the present invention is in use, the working method is basically the same as that in Example 1, with the only difference being that, during the entire process, a single stirring drive motor 20 simultaneously drives the stirring blades 22 and the scraper 24 of the filter layer to rotate together through the stirring shaft 21.

Claims

1. A large-volume open integrated circulating agglomeration granulation fluidized bed water treatment equipment, comprising a tank body (4), characterized in that: The tank body (4) is provided with an inner cylinder (1), a middle cylinder (2) and an outer cylinder (3) in sequence from the inside to the outside. The inner cylinder (1), the middle cylinder (2), the outer cylinder (3) and the tank body (4) are all coaxially fixed. The bottom end of the middle cylinder (2) is open, and the bottom end of the middle cylinder (2) is connected to a mixing cylinder (5) with a closed bottom end. The bottom end of the tank body (4) is closed and the top end is open; the position between the outer cylinder (3) and the tank body (4) and above the top end of the middle cylinder (2) is a water collection area (6); the internal cavity of the tank body (4) below the bottom end of the outer cylinder (3) and outside the closed mixing cylinder (5) is a sludge concentration area (7); The bottom end of the outer cylinder (3) is open to form a separation water inlet (8); the position between the outer cylinder (3) and the tank body (4) and below the top of the middle cylinder (2) is a separation zone (9); the top of the separation zone (9) is connected to the water collection zone (6); the bottom of the separation zone (9) is connected to the sludge concentration zone (7); A water outlet weir (10) is provided on the inner wall of the tank body in the water collection area (6), and a water collecting trough (11) is provided on the top outer wall of the tank body (4). Clean water flows through the water outlet weir (10) and enters the water collecting trough (11); The bottom end of the inner cylinder (1) is open, and the inner cylinder (1) is a granulation fluidization zone (12); the top end of the inner cylinder (1) is open, and the top end of the middle cylinder (2) is higher than the top end of the inner cylinder (1), forming a reflux water inlet (13), and the inner cylinder (1) and the middle cylinder (2) are connected to a circulation zone (14); the top end of the middle cylinder (2) is open, and the top end of the outer cylinder (3) is higher than the top end of the middle cylinder (2), forming a sludge sedimentation outlet (15), and the sludge sedimentation zone (16) is between the middle cylinder (2) and the outer cylinder (3), and the bottom of the sludge sedimentation zone (16) is connected to the sludge concentration zone (7); the mixing cylinder (5) is a mixing zone (17), and the top of the mixing zone (17) is connected to the granulation fluidization zone (12) and the circulation zone (14); The bottom end of the middle cylinder (2) is close to the bottom end of the inner cylinder (1) and contracts inwardly to form a contraction inner wall (18). A reflux outlet slit (19) is formed between the bottom end of the inner cylinder (1) and the contraction inner wall (18) of the middle cylinder (2), which is used to form a local negative pressure and provide reflux power. The bottom end of the contraction inner wall (18) of the middle cylinder (2) is connected to the mixing cylinder (5), and the reflux outlet slit (19) is connected to the top of the mixing zone (17). A sludge discharge pipe (27) communicating with the sludge concentration area (7) in the tank body (4) is provided on the outer wall of the tank body (4); The inner diameter of the mixing cylinder (5) is smaller than or equal to the inner diameter of the inner cylinder (1); The top end of the outer cylinder (3) is closed, and the top end of the outer cylinder (3) is higher than the top end of the tank body (4); a stirring drive motor (20) is installed at the closed top end of the outer cylinder (3), and the stirring drive motor (20) drives the stirring shaft (21); The stirring shaft (21) passes through the inner cylinder (1) and extends into the mixing cylinder (5); a stirring blade (22) is installed on the stirring shaft (21) in the inner cylinder (1); the bottom end of the stirring shaft (21) uses a water distributor (23) fixedly installed in the mixing cylinder (5) as a rotation support seat, and the rotation of the stirring shaft (21) drives the stirring blade (22) to rotate.

2. The large-volume open integrated circulation agglomeration and granulation fluidized bed water treatment equipment according to claim 1 is characterized in that: The bottom end of the mixing cylinder (5) is connected to the water inlet pipe (25), and the water inlet pipe (25) passes through the side wall of the tank body (4) and extends to the outside of the tank body (4).

3. The large-volume open integrated circulation agglomeration and granulation fluidized bed water treatment equipment according to claim 1, characterized in that: The bottom of the tank body (4) is a conical bucket bottom, and the bottom of the mixing drum (5) is a conical bucket bottom. The tank body (4) is made of reinforced concrete, and the tank body (4) is fixed on the foundation (29).

4. A large-volume open integrated circulating agglomeration granulation fluidized bed water treatment equipment, comprising a tank body (4), characterized in that: The tank body (4) is provided with an inner cylinder (1), a middle cylinder (2) and an outer cylinder (3) in sequence from the inside to the outside. The inner cylinder (1), the middle cylinder (2), the outer cylinder (3) and the tank body (4) are all coaxially fixed. The bottom end of the middle cylinder (2) is open, and the bottom end of the middle cylinder (2) is connected to a mixing cylinder (5) with a closed bottom end. The bottom end of the tank body (4) is closed and the top end is open; the position between the outer cylinder (3) and the tank body (4) and above the top end of the middle cylinder (2) is a water collection area (6); the internal cavity of the tank body (4) below the bottom end of the outer cylinder (3) and outside the closed mixing cylinder (5) is a sludge concentration area (7); The bottom end of the outer cylinder (3) is open to form a separation water inlet (8); the position between the outer cylinder (3) and the tank body (4) and below the top of the middle cylinder (2) is a separation zone (9); the top of the separation zone (9) is connected to the water collection zone (6); the bottom of the separation zone (9) is connected to the sludge concentration zone (7); A water outlet weir (10) is provided on the inner wall of the tank body in the water collection area (6), and a water collecting trough (11) is provided on the top outer wall of the tank body (4). Clean water flows through the water outlet weir (10) and enters the water collecting trough (11); The bottom end of the inner cylinder (1) is open, and the inner cylinder (1) is a granulation fluidization zone (12); the top end of the inner cylinder (1) is open, and the top end of the middle cylinder (2) is higher than the top end of the inner cylinder (1), forming a reflux water inlet (13), and the inner cylinder (1) and the middle cylinder (2) are connected to a circulation zone (14); the top end of the middle cylinder (2) is open, and the top end of the outer cylinder (3) is higher than the top end of the middle cylinder (2), forming a sludge sedimentation outlet (15), and the sludge sedimentation zone (16) is between the middle cylinder (2) and the outer cylinder (3), and the bottom of the sludge sedimentation zone (16) is connected to the sludge concentration zone (7); the mixing cylinder (5) is a mixing zone (17), and the top of the mixing zone (17) is connected to the granulation fluidization zone (12) and the circulation zone (14); The bottom end of the middle cylinder (2) is close to the bottom end of the inner cylinder (1) and contracts inwardly to form a contraction inner wall (18). A reflux outlet slit (19) is formed between the bottom end of the inner cylinder (1) and the contraction inner wall (18) of the middle cylinder (2), which is used to form a local negative pressure and provide reflux power. The bottom end of the contraction inner wall (18) of the middle cylinder (2) is connected to the mixing cylinder (5), and the reflux outlet slit (19) is connected to the top of the mixing zone (17). A sludge discharge pipe (27) communicating with the sludge concentration area (7) in the tank body (4) is provided on the outer wall of the tank body (4); The inner diameter of the mixing cylinder (5) is smaller than or equal to the inner diameter of the inner cylinder (1); The top end of the outer cylinder (3) is closed, and the top end of the outer cylinder (3) is higher than the top end of the tank body (4); a stirring drive motor (20) is installed at the closed top end of the outer cylinder (3), and the stirring drive motor (20) drives the stirring shaft (21); The stirring shaft (21) passes through the inner cylinder (1) and the mixing cylinder (5) in sequence and extends into the bottom of the tank body (4); a stirring blade (22) is installed on the stirring shaft (21) in the inner cylinder (1); the stirring shaft (21) uses a water distributor (23) fixedly installed in the mixing cylinder (5) as a rotation support seat; the bottom end of the stirring shaft (21) is connected to a scraper (24) installed at the bottom of the tank body (4); the rotation of the stirring shaft (21) drives the stirring blade (22) and the scraper (24) to rotate.

5. The large-volume open integrated circulating agglomeration and granulation fluidized bed water treatment equipment according to claim 4, characterized in that: The bottom end of the mixing drum (5) is connected to a water inlet pipe (25), which passes through the side wall of the tank body (4) and extends to the outside of the tank body (4); a sliding sealing sleeve (26) is provided between the bottom of the water inlet pipe (25) and the stirring shaft (21).

6. The large-volume open integrated circulation agglomeration and granulation fluidized bed water treatment equipment according to claim 4, characterized in that: The bottom of the tank body (4) is an arc-shaped bottom, and the bottom of the mixing drum (5) is a conical bucket bottom. The tank body (4) is made of steel material, and the tank body (4) is installed on the base frame (28).

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