A circulating crystallization granulation solid-liquid separation fluidized bed system

Abstract

The application provides a circulating crystallization granulation solid-liquid separation fluidized bed system and relates to the technical field of water treatment. The fluidized bed system comprises a fluidized bed, a flocculation device for stirring high-suspension raw water and sludge particles to move, forming a sludge-water mixture with crystalline particles and liquid, the sludge-water mixture entering a suspension zone to form a sludge suspension layer and suspension zone produced water, a negative pressure device for generating negative pressure to make sludge particles in a sludge zone enter a flocculation cavity, make the sludge-water mixture enter the suspension zone and make the suspension zone produced water enter the filtration zone, a raw water supply device for conveying high-suspension raw water into the flocculation cavity, an adjusting device for adjusting the amount of sludge particles entering the flocculation cavity, a filtration device for filtering the suspension zone produced water to generate clean water and a fluid control device for sending the suspension zone produced water into the filtration zone and leading out the clean water. The application solves the problem of serious abrasion of subsequent sludge conveying power equipment caused by the addition of micro sand in the crystallization granulation process in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a circulating crystallization granulation solid-liquid separation fluidized bed system. BACKGROUND

[0002] In the existing project, the crystallization granulation solid-liquid separation fluidized bed needs to add micro-sand as a crystal seed, and the micro-sand provides a high-density condensation nucleus for the flocculation zone to improve the density of the flocculation zone. After the micro-sand is added, the sludge generated by flocculation enters the sludge treatment system and finally enters the plate and frame filter press system for sludge and water separation process, and finally exists in the mud cake after pressing. In engineering application, the presence of micro-sand causes the plate and frame filter press feed pump to wear seriously. The plate and frame filter press feed pump is usually a screw pump, and the stator and rotor, the core components in the pump, are scratched by micro-sand within a few weeks of operation. The existence of scratches causes the screw pump to be unable to maintain normal pressure, thereby causing the plate and frame filter press system to be unable to normally press and work. In addition, the sludge backflow technology used has the problem of being unable to effectively control and adjust the amount of backflow sludge, and also needs to solve the problem of external discharge of treated wastewater.

[0003] Therefore, a system is needed to solve at least one of the above problems. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a circulating crystallization granulation solid-liquid separation fluidized bed system to solve the problem of serious wear of subsequent sludge conveying power equipment caused by the addition of micro-sand in the crystallization granulation process in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present application provides a circulating crystallization granulation solid-liquid separation fluidized bed system, which comprises:

[0006] The fluidized bed has a filtration zone, a suspension zone, a flocculation zone and a sludge zone arranged in sequence from top to bottom, the filtration zone and the suspension zone are separated by a partition, the suspension zone, the flocculation zone and the sludge zone are communicated, and the sludge zone is used to collect sludge particles as crystal seeds;

[0007] The flocculation device has a flocculation cavity and is arranged in the flocculation zone. A sludge passage is formed between the outer cylinder wall of the flocculation device and the inner cylinder wall of the fluidized bed. The flocculation device is used to agitate the high-suspension water and sludge particles entering the flocculation cavity to move, forming a sludge-water mixture with crystal particles and liquid. The sludge-water mixture enters the suspension zone to form a sludge suspension layer and a suspension zone water production. The heavy sludge particles in the sludge suspension layer fall into the sludge zone again through the sludge passage;

[0008] A negative pressure device is arranged in the sludge zone for generating a negative pressure, under the action of which sludge particles in the sludge zone enter the flocculation cavity through the negative pressure device, the sludge-water mixture enters the suspension zone, and water produced in the suspension zone enters the filtration zone;

[0009] A water supply device is connected to the negative pressure device for conveying high-suspended substance water into the flocculation cavity through the negative pressure device;

[0010] An adjusting device is movably arranged on the negative pressure device for adjusting the amount of sludge particles entering the flocculation cavity through the negative pressure device;

[0011] A filtration device is arranged in the filtration zone for filtering the water produced in the suspension zone entering the filtration zone to generate clean water;

[0012] A fluid control device is used to send the water produced in the suspension zone into the filtration zone, so that the water produced in the suspension zone is further filtered through the filtration device (5) to generate and discharge clean water.

[0013] Specifically, the circulating crystallization, granulation and solid-liquid separation fluidized bed system further comprises an upper water distribution ring having one upper water distribution outlet and a plurality of upper water distribution inlets, the plurality of upper water distribution inlets being in communication with the suspension zone, and the fluid control device being in communication with the suspension zone by being connected to the upper water distribution outlet of the upper water distribution ring.

[0014] Specifically, the filtration device comprises a filter material, a water distribution assembly, a water collection tray and a drain pipe.

[0015] The filter material is layered and laid in the filtration zone, and the water produced in the suspension zone entering the filtration zone is filtered through the filter material to generate clean water.

[0016] The water distribution assembly is embedded in the filter material above the partition plate and is in communication with the fluid control device for uniformly distributing the water produced in the suspension zone entering the filtration zone.

[0017] The water collection tray is arranged above the filter material in the filtration zone for collecting clean water.

[0018] One end of the drain pipe is connected to the water collection tray, and the other end is connected to the fluid control device, and the clean water collected by the water collection tray enters the fluid control device through the drain pipe.

[0019] Specifically, the water distribution assembly comprises a flow guide tray, a flow guide pipe, a water distribution tray and a plurality of water distribution nozzles.

[0020] The flow guide tray is arranged and fixed on the partition plate, one end of the flow guide pipe is connected to the fluid control device, and the other end extends into the flow guide tray and the partition plate, and the water produced in the suspension zone enters the filtration zone through the flow guide pipe.

[0021] The water distribution tray is arranged above the flow guide tray, and a plurality of water distribution holes are formed in the water distribution tray, and one water distribution nozzle is arranged at each water distribution hole;

[0022] Each water distribution nozzle has a plurality of water inlets and a plurality of water outlets, the plurality of water inlets are arranged between the water distribution tray and the flow guide tray, and the plurality of water outlets are arranged above the water distribution tray.

[0023] Specifically, the circulating crystallization granulation solid-liquid separation fluidized bed system further comprises a gas feeding device;

[0024] The gas feeding device comprises a gas feeding pipe, one end of the gas feeding pipe extends into the filter zone between the flow guide tray and the water distribution tray, and the gas feeding device feeds compressed air into the filter zone through the gas feeding pipe.

[0025] Specifically, the flocculation device comprises a flocculation outer cylinder, a flocculation inner cylinder, and a stirring assembly;

[0026] The flocculation outer cylinder is open at one end and is arranged in the flocculation zone of the fluidized bed, the open end of the flocculation outer cylinder is arranged towards the suspension zone, and an annular sludge passage is formed between the outer cylinder wall of the flocculation outer cylinder and the inner cylinder wall of the fluidized bed;

[0027] The flocculation inner cylinder is sleeved in the flocculation outer cylinder, an annular circulation zone is formed between the flocculation outer cylinder and the flocculation inner cylinder, the inner cavity of the flocculation inner cylinder serves as a flocculation chamber, the flocculation chamber is in communication with the circulation zone, and under the action of negative pressure, the high-suspension water and sludge particles entering the flocculation chamber can flow between the flocculation chamber and the circulation zone to perform crystallization and granulation;

[0028] The stirring assembly is arranged in the flocculation inner cylinder and is used to stir the high-suspension water and sludge particles entering the flocculation chamber to move to form a sludge-water mixture with crystalline particles and liquid.

[0029] Specifically, the stirring assembly comprises a stirring shaft and a stirring driver;

[0030] The stirring shaft has a stirring end and a mounting end, the mounting end is rotatably arranged outside the fluidized bed, the stirring end extends into the flocculation chamber after passing through the sludge zone in the fluidized bed, and the high-suspension water and sludge particles can be stirred to move by rotating the stirring shaft;

[0031] The stirring driver is arranged on the fluidized bed and is used to drive the stirring shaft to rotate.

[0032] Specifically, the stirring assembly further comprises a stirring driving wheel and a stirring driven wheel;

[0033] The stirring drive wheel is mounted on the drive shaft of the stirring driver, and the stirring driven wheel is mounted on the mounting end of the stirring shaft. The stirring drive wheel and the stirring driven wheel mesh with each other, and the stirring driver drives the stirring drive wheel to rotate, thereby driving the stirring driven wheel and the stirring shaft to rotate.

[0034] Specifically, the negative pressure device includes: a lower water distribution ring and multiple self-priming devices;

[0035] The lower water distribution ring has a lower water distribution inlet and a lower water distribution outlet in the same number as the self-primer, and the lower water distribution inlet is connected to the water supply device.

[0036] Multiple self-primers are evenly distributed circumferentially along the stirring shaft. The self-primers are used to generate negative pressure. Each self-primer has a self-priming inlet, a self-priming outlet, and multiple self-priming particle inlets. The self-priming inlet of each self-primer is connected to the corresponding lower water distribution outlet, and the self-priming outlet of each self-primer is connected to the flocculation chamber. High suspended solids water enters from the self-priming inlet and exits from the self-priming outlet into the flocculation chamber. Sludge particles enter from the self-priming particle inlets and exit from the self-priming outlet into the flocculation chamber.

[0037] Specifically, the adjustment device includes: a main sleeve, an adjustment drive mechanism, and an adjustment sleeve in the same number as the self-priming unit;

[0038] The main sleeve is fitted onto the stirring shaft and can move along the axial direction of the stirring shaft;

[0039] Multiple adjusting sleeves are connected to the main sleeve and are evenly distributed and fitted on the corresponding self-priming device along the circumference of the main sleeve. The adjusting sleeves can adjust the opening of the self-priming particle inlet on the corresponding self-priming device during the axial movement of the main sleeve along the stirring shaft.

[0040] The adjusting transmission mechanism is disposed on the fluidized bed and is used to drive the main sleeve to move axially along the stirring shaft.

[0041] Specifically, the adjusting transmission mechanism includes: an adjusting driver, an adjusting gear, and an adjusting rack;

[0042] The adjusting rack is fixed to the main sleeve along the axial direction of the main sleeve;

[0043] The adjusting gear is mounted on the drive shaft of the adjusting driver and meshes with the adjusting rack. The rotation of the adjusting gear can drive the adjusting rack and the main sleeve to move axially along the stirring shaft.

[0044] The regulating driver is disposed on the fluidized bed and is used to drive the regulating gear to rotate.

[0045] Specifically, the circulating crystallization granulation solid-liquid separation fluidized bed system further includes: a scraper assembly disposed in the sludge zone;

[0046] The stirring driver is also used to drive the scraper assembly to rotate and scrape up the sludge particles in the sludge zone.

[0047] Specifically, the scraper assembly includes: a scraper sleeve, a scraper blade, a scraper drive wheel, and a scraper driven wheel;

[0048] The sludge scraper sleeve is rotatably fitted onto the shaft of the stirring shaft located in the sludge zone.

[0049] The scraper blade is mounted on the scraper sleeve and is used to scrape up sludge particles.

[0050] The driven wheel for scraping mud is mounted on the scraping sleeve;

[0051] The active scraper wheel is mounted on the drive shaft of the mixing driver. The active scraper wheel meshes with the driven scraper wheel. The rotation of the active scraper wheel drives the driven scraper wheel, the scraper sleeve, and the scraper plate to rotate, thereby scraping up the sludge particles.

[0052] The stirring driver is also used to drive the scraper drive wheel to rotate.

[0053] The circulating crystallization granulation solid-liquid separation fluidized bed system provided by this invention comprises, from top to bottom, a filtration zone, a suspension zone, a flocculation zone, and a sludge zone within the fluidized bed. A partition separates the filtration and suspension zones, while the suspension, flocculation, and sludge zones are interconnected. A flocculation device is located in the flocculation zone, and a negative pressure device in the sludge zone generates negative pressure. This negative pressure forces sludge particles collected in the sludge zone into the flocculation chamber. An adjustment device on the negative pressure device regulates the amount of sludge particles entering the flocculation chamber. High-suspended-solids influent from the water supply device also enters the flocculation chamber via the negative pressure device. In the flocculation chamber, the incoming water and sludge particles with high suspended solids enter the flocculation chamber and are agitated by the flocculation device to form a mud-water mixture containing crystalline particles and liquid. After the flocculation reaction, the mud-water mixture in the flocculation chamber enters the suspension zone. The mud-water mixture in the suspension zone gradually gathers to form a suspended sludge layer and suspended zone permeate. The heavier sludge particles in the suspended sludge layer fall into the sludge zone through the mud channel under their own gravity. The permeate from the suspension zone enters the filtration device set in the filtration zone through the fluid control device. The filtration device further filters out the crystalline particles and other impurities in the permeate from the suspension zone to form purified water. The purified water is discharged through the fluid control device.

[0054] The circulating crystallization granulation solid-liquid separation fluidized bed system provided by this invention uses sludge particles falling into the sludge zone as seed crystals for crystallization and sends them into the flocculation chamber to be fully mixed with water containing high suspended solids to form crystal particles. This avoids the need to add extra micro-sand during the crystallization granulation process and solves the problem in the prior art where the addition of micro-sand during the crystallization granulation process causes severe wear on the subsequent sludge conveying power equipment. It also realizes self-crystallization inside the fluidized bed.

[0055] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0056] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0057] Figure 1 This is a schematic diagram of the structure of the circulating crystallization granulation solid-liquid separation fluidized bed system provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the backwashing process of the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0059] Figure 3 This is a schematic diagram of the internal installation structure of the fluidized bed in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in the embodiments of the present invention;

[0060] Figure 4 This is a schematic diagram of the upper water distribution ring in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0061] Figure 5 This is a schematic diagram of the scraper assembly in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0062] Figure 6 This is an assembly diagram of the negative pressure device in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0063] Figure 7 A schematic diagram of the negative pressure device in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0064] Figure 8 A cross-sectional view of the self-primer in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0065] Figure 9 A schematic diagram of the regulating device in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0066] Figure 10 A schematic diagram of the regulating device not completely blocking the self-aspirating particle inlet in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0067] Figure 11 A schematic diagram of the regulating device completely blocking the self-priming particle inlet in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0068] Figure 12 A schematic diagram of the guide plate in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention;

[0069] Figure 13 A schematic diagram of the water distribution plate in the circulating crystallization granulation solid-liquid separation fluidized bed system provided in this embodiment of the invention.

[0070] Explanation of reference numerals in the attached figures

[0071] 1-Fluidized bed; 2-Flocculation device; 3-Negative pressure device; 4-Fluid control device; 5-Filtration device; 6-Regulating device; 7-Scraper assembly; 8-Upper water distribution ring; 9-Air supply pipe; 11-Baffle plate; 12-Circulating pump; 13-Exhaust port; 14-Inlet valve; 15-Backwash valve; 16-Sludge discharge port; 20-Flocculation chamber; 21-Outer flocculation cylinder; 22-Inner flocculation cylinder; 23-Agitator assembly; 24-Guide ring; 211-Outer cylinder bottom plate; 231-Agitator shaft; 232-Agitator driver; 233-Agitator drive wheel; 234-Agitator driven wheel; 235-Agitator blade; 31-Lower water distribution ring; 32-Self-priming device; 33-Connecting pipe; 321-Self-priming chamber; 322-Self-priming hole ; 51-Water distribution assembly; 52-Water collection tray; 53-Drain pipe; 511-Guide plate; 512-Guide pipe; 513-Water distribution tray; 514-Water distribution nozzle; 61-Main sleeve; 62-Adjustment drive mechanism; 63-Adjustment sleeve; 621-Adjustment driver; 622-Adjustment gear; 623-Adjustment rack; 71-Scraper sleeve; 72-Scraper blade; 73-Scraper drive wheel; 74-Scraper driven wheel; 41-Valve body; 42-First valve core; 43-Second valve core; 44-Upper control sub-cavity; 45-Intermediate sub-cavity; 46-Lower control sub-cavity; 411-First water inlet; 412-Second water inlet; 413-Third water inlet; 414-Fourth water inlet; 415-Fifth water inlet. Detailed Implementation

[0072] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0073] Figure 1This is a schematic diagram of the structure of a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 2 This is a schematic diagram of the backwashing process in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 3 This is a schematic diagram of the internal installation structure of the fluidized bed in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 4 This is a schematic diagram of the upper water distribution ring in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 5 This is a schematic diagram of the scraper assembly in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 6 This is an assembly diagram of the negative pressure device in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 7 This is a schematic diagram of the negative pressure device in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 8 This is a cross-sectional view of the self-primer in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 9 This is a schematic diagram of the regulating device in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 10 This is a schematic diagram showing that the regulating device in the circulating crystallization granulation solid-liquid separation fluidized bed system is not completely blocked from the self-priming particle inlet; Figure 11 This is a schematic diagram showing the complete sealing of the self-priming particle inlet by the regulating device in a circulating crystallization granulation solid-liquid separation fluidized bed system. Figure 12 This is a schematic diagram of the guide plate in a circulating crystallization granulation solid-liquid separation fluidized bed system; Figure 13 This is a schematic diagram of the water distribution plate in a circulating crystallization granulation solid-liquid separation fluidized bed system.

[0074] like Figures 1-13 As shown, the present invention provides a circulating crystallization granulation solid-liquid separation fluidized bed system, the circulating crystallization granulation solid-liquid separation fluidized bed system comprising:

[0075] Fluidized bed 1 has a filtration zone, a suspension zone, a flocculation zone and a sludge zone arranged sequentially from top to bottom. The filtration zone and the suspension zone are separated by a partition 11. The suspension zone, the flocculation zone and the sludge zone are connected. The sludge zone is used to collect sludge particles as seed crystals.

[0076] The flocculation device 2 has a flocculation chamber 20, which is set in the flocculation zone. A sludge passage is formed between the outer cylinder wall of the flocculation device 2 and the inner cylinder wall of the fluidized bed 1. The flocculation device 2 is used to stir the high suspended solids water and sludge particles entering the flocculation chamber 20 to form a mud-water mixture with crystalline particles and liquid. The mud-water mixture enters the suspension zone and converges to form a sludge suspension layer and suspension zone water. Large sludge particles in the sludge suspension layer fall back into the sludge zone through the mud passage.

[0077] Negative pressure device 3 is installed in the sludge zone to generate negative pressure. Under the action of negative pressure, the sludge particles in the sludge zone enter the flocculation chamber 20 through the negative pressure device 3, the sludge-water mixture enters the suspension zone, and the water produced in the suspension zone enters the filtration zone.

[0078] A water supply device is connected to the negative pressure device 3 and is used to deliver water with high suspended solids to be treated into the flocculation chamber 20 through the negative pressure device 3.

[0079] Adjustment device 6 is movably mounted on the negative pressure device 3 and is used to adjust the amount of sludge particles entering the flocculation chamber 20 through the negative pressure device 3.

[0080] Filter device 5 is installed in the filtration zone and is used to filter the suspended water entering the filtration zone to generate clean water;

[0081] Fluid control device 4 is used to send the water produced in the suspension zone into the filtration zone, where it is further filtered by filtration device 5 to generate and export clean water.

[0082] The circulating crystallization granulation solid-liquid separation fluidized bed system provided by this invention, such as... Figures 1-3As shown, the fluidized bed 1 is a hollow cylindrical structure. The fluidized bed 1 is divided into a filtration zone, a suspension zone, a flocculation zone and a sludge zone from top to bottom. The filtration zone and the suspension zone are separated by a partition 11, so as to avoid the purified water formed in the filtration zone being re-contaminated by the water produced in the suspension zone. The flocculation device 2 is located in the flocculation zone, and a sludge passage is formed between the outer wall of the flocculation device 2 and the inner wall of the fluidized bed 1. The negative pressure device 3 is located in the sludge zone and generates negative pressure. Under the negative pressure generated by the negative pressure device 3, sludge particles in the sludge zone act as seed crystals, entering the flocculation chamber 20 of the flocculation device 2 via the negative pressure device 3. Simultaneously, the water supply device delivers high-suspended-solids water to be treated into the flocculation chamber 20 through the negative pressure device 3. The high-suspended-solids water has a high suspended solids content, meaning its turbidity is high. The high-suspended-solids water and sludge particles entering the flocculation chamber 20 are agitated by the flocculation device 2, forming a mud-water mixture containing crystalline particles and liquid. This mud-water mixture then enters the suspension zone. The suspended zone converges to form a sludge suspension layer at the bottom, composed of flocculated sludge particles, and suspended zone permeate above the sludge suspension layer. As more sludge-water mixture enters the suspended zone, the previously formed sludge suspension layer also acts as a filter. After the sludge-water mixture enters the suspended zone, the sludge particles in it settle in the sludge suspension layer, making the sludge particles in the sludge suspension layer increasingly heavier. Under the action of their own gravity, the heavier sludge particles in the suspended zone fall back into the sludge zone through the sludge channel. The suspended zone permeate then enters the filtration device 5 through the fluid control device 4. The filtration device 5 removes the crystal particles and impurities in the suspended zone permeate to form purified water, which is finally discharged through the fluid control device 4. The sludge particles deposited in the sludge zone are used as seed crystals, and a small portion of the sludge particles are pumped into the flocculation chamber 20 under negative pressure by the negative pressure device 3 to participate in crystallization and granulation, while the majority of the sludge particles are finally discharged through the sludge discharge port 16 located in the sludge zone of the fluidized bed 1. The circulating crystallization granulation solid-liquid separation fluidized bed system provided by this invention utilizes sludge particles as seed crystals for crystallization granulation, avoiding the use of micro-sand. This solves the problem in the prior art where the addition of micro-sand during the crystallization granulation process causes severe wear and damage to the components of the sludge conveying power equipment. It achieves self-crystallization within the fluidized bed. At the same time, by using the system, the filtered and intercepted materials within the fluidized bed further participate in the flocculation reaction within the fluidized bed, thereby achieving zero wastewater discharge from the fluidized bed. This makes the crystallization granulation solid-liquid separation fluidized bed system more environmentally friendly and more controllable.

[0083] In order to send the permeate from the suspended zone into the filtration zone for filtration, such as Figure 4As shown, the circulating crystallization granulation solid-liquid separation fluidized bed system further includes: an upper water distribution ring 8, having an upper water distribution outlet and multiple upper water distribution inlets, the multiple upper water distribution inlets being connected to the suspension zone, and the fluid control device 4 being connected to the suspension zone through the upper water distribution outlet of the upper water distribution ring 8.

[0084] The filtration device 5 includes: filter media, water distribution assembly 51, water collection tray 52 and drain pipe 53;

[0085] The filter media is laid in layers in the filtration zone, and the suspended water entering the filtration zone is filtered through the filter media to generate purified water.

[0086] The water distribution assembly 51 is embedded in the filter media, located above the partition 11, and connected to the fluid control device 4, for uniformly distributing the suspended water entering the filtration zone;

[0087] The water collection tray 52 is located above the filter media in the filtration zone and is used to collect purified water.

[0088] One end of the drain pipe 53 is connected to the water collection tray 52, and the other end is connected to the fluid control device 4. The clean water collected by the water collection tray 52 enters the fluid control device 4 through the drain pipe 53.

[0089] The water distribution assembly 51 includes: a flow guide plate 511, a flow guide pipe 512, a water distribution plate 513, and multiple water distribution nozzles 514;

[0090] The flow guide plate 511 is fixed on the partition plate 11. One end of the flow guide pipe 512 is connected to the fluid control device 4, and the other end extends between the flow guide plate 511 and the partition plate 11. The water produced in the suspension zone enters the filtration zone through the flow guide pipe 512.

[0091] The water distribution plate 513 is disposed above the guide plate 511. The water distribution plate 513 has multiple water distribution holes, and each water distribution hole is provided with a water distribution nozzle 514.

[0092] Each water distribution nozzle 514 has multiple water inlets and multiple water outlets. The multiple water inlets are arranged between the water distribution plate 513 and the guide plate 511, and the multiple water outlets are arranged above the water distribution plate 513.

[0093] The circulating crystallization granulation solid-liquid separation fluidized bed system also includes: an air supply device;

[0094] The air supply device includes an air supply pipe 9, one end of which extends into the filtration zone between the guide plate 511 and the water distribution plate 513. The air supply device supplies compressed air to the filtration zone through the air supply pipe 9.

[0095] To filter crystalline particles and other impurities in the suspended zone product water, the filter media consists of coarse and fine sand. The coarse and fine sand are layered in the filtration zone, forming coarse and fine sand layers. The coarse sand layer is positioned below the fine sand layer. A lower isolation net is installed between the coarse and fine sand layers, and an upper isolation net is laid on top of the fine sand layer. These lower and upper isolation nets prevent disturbance of the suspended zone product water from altering the particle size distribution of the coarse and fine sand. The guide plate 511, distribution plate 513, and multiple distribution nozzles 514 in the water distribution assembly 51 are all embedded in the coarse sand layer, from the guide pipe 51... 2. The suspended water entering the filtration zone diffuses radially in the coarse sand layer of the filtration zone under the guiding action of the guide plate 511. Then it enters through multiple inlets of multiple water distribution nozzles 514 and flows out from the outlets of multiple water distribution nozzles 514, so that the suspended water is evenly distributed in the coarse sand layer, which facilitates better filtration of the suspended water in the coarse sand layer. The suspended water filtered by the coarse sand layer is then filtered by the fine sand layer to form clean water, which is collected in the water collection plate 52 set at the top of the fluidized bed 1. The collected clean water is finally discharged from the fluidized bed 1 through the drain pipe 53.

[0096] like Figure 1 and Figure 2 As shown, the fluid control device 4 includes a valve body 41, a first valve core 42, and a second valve core 43. The valve body 41 has a valve cavity, on which a first water inlet 411, a second water inlet 412, a third water inlet 413, a fourth water inlet 414, and a fifth water inlet 415 are provided. The first valve core 42 and the second valve core 43 are slidably disposed in the valve cavity, dividing the valve cavity into an independent upper control sub-cavity 44, an intermediate sub-cavity 45, and a lower control sub-cavity 46. The first water inlet 411 is connected to one end of the guide pipe 512, the second water inlet 412 is connected to the negative pressure device 3, and the third water inlet 412 is connected to the drain pipe 53. The fourth water inlet 414 is connected to the purified water tank, and the fifth water inlet 415 is connected to the upper water outlet of the upper water distribution ring 8. The first valve core 42 slides in the valve cavity and can control the connection or disconnection between the first water inlet 411 and the lower control sub-cavity 46 or the intermediate sub-cavity 45. The second valve core 43 slides in the valve cavity and can control the connection or disconnection between the third water inlet 413 and the upper control sub-cavity 44 or the intermediate sub-cavity 45. Multiple upper water inlets of the upper water distribution ring 8 extend into the suspension zone. The water produced in the suspension zone enters the upper water distribution ring 8 through multiple upper water inlets and flows out from the upper water outlet of the upper water distribution ring 8.

[0097] like Figure 1As shown, when it is necessary to send the permeate from the suspended zone into the filtration zone for filtration, the first valve core 42 moves within the valve chamber, so that both the first water inlet 411 and the fifth water inlet 415 are connected to the intermediate sub-cavity 45. In this way, the permeate from the suspended zone enters the upper water distribution ring 8 through multiple upper water distribution inlets, flows out from the upper water distribution outlet of the upper water distribution ring 8, and enters the filtration zone through the fifth water inlet 415, the intermediate sub-cavity 45, the first water inlet 411, and the guide pipe 512. The permeate from the suspended zone entering the filtration zone permeates from bottom to top, and the purified water produced after filtration through the coarse sand layer and the fine sand layer is collected. The water flows into the water collection tray 52 located at the top of the fluidized bed 1. The water collection tray 52 has a bowl-shaped structure. One end of the drain pipe 53 is connected to the bottom of the water collection tray 52, and the other end is connected to the third water inlet 413. When the first valve core 42 moves in the valve cavity, the second valve core 43 also moves in the valve cavity. When both the third water inlet 413 and the fourth water inlet 414 are connected to the upper control sub-cavity 44, the purified water collected in the water collection tray 52 can be discharged into the purified water tank through the drain pipe 53, the third water inlet 413, the upper control sub-cavity 44, and the fourth water inlet 414. When filtration cannot be performed in the filtration zone, the control of the first valve core 42... A valve core 42 moves within the valve cavity, connecting both the first water inlet 411 and the second water inlet 412 to the lower control sub-cavity 46. The second water inlet 412 is connected to the lower water distribution inlet of the lower water distribution ring 31 via the circulation pump 12. Simultaneously, the second valve core 43 is controlled to move within the valve cavity, connecting both the fifth water inlet 415 and the third water inlet 413 to the intermediate sub-cavity 45. Thus, the suspended zone product water flowing out from the upper water distribution outlet of the upper water distribution ring 8 enters the intermediate sub-cavity 45 of the fluid control device 4 through the fifth water inlet 415, and then flows from the intermediate sub-cavity 45 through the third water inlet 413 and the drain pipe 53 into the water collection chamber. Water entering the suspension zone of the collection tray 52 flows from top to bottom through the fine sand layer and the coarse sand layer to wash away impurities in the fine sand layer and the coarse sand layer. Finally, the water in the suspension zone, carrying impurities, flows from the guide pipe 512 into the first water inlet 411, the lower control sub-chamber 46, the second water inlet 412, the circulation pump 12, and the lower water distribution inlet of the lower water distribution ring 31. After passing through the self-primer 32, it re-enters the flocculation chamber 20. By controlling the movement of the first valve core 42 and the second valve core 43 in the control fluid control device 4 within the valve chamber, the connection or disconnection between the water inlets can be controlled to achieve different needs, such as... Figure 2As shown, during backwashing, compressed air is first supplied to the filtration zone through the air supply pipe 9 of the air supply device to expand the coarse and fine sand layers in the filtration zone for air scrubbing. Then, the first valve core 42 and the second valve core 43 are controlled to move within the valve chamber, so that the third water inlet 413 and the fifth water inlet 415 are both connected to the intermediate sub-chamber 45, and the first water inlet 411 and the second water inlet 412 are both connected to the lower control sub-chamber 46. The suspended zone product water is sent from the fifth water inlet 415, the intermediate sub-chamber 45, the third water inlet 413, and the drain pipe 53 into the water collection tray 52 at the top of the filtration zone. The water flow entering the filtration zone washes the fine and coarse sand layers from top to bottom, so as to remove the crystal particles and impurities in the fine and coarse sand layers through the guide pipe. 512. The first water inlet 411, the lower control chamber 46, and the second water inlet 412 are flushed out, the backwash valve 15 is opened, and the inlet valve 14 is closed. The backwash valve 15 is set on the connecting pipe between the second water inlet 412 and the lower water inlet of the lower water distribution ring 31. The circulating pump 12 is set on the connecting pipe between the second water inlet 412 and the lower water inlet of the lower water distribution ring 31, which is located between the backwash valve 15 and the second water inlet 412. The inlet valve 14 is set on the connecting pipe between the water supply device and the lower water inlet of the lower water distribution ring 31. By starting the circulating pump 12, the flushed crystal particles and impurities are sent back into the flocculation chamber 20 through the negative pressure device 3 for flocculation reaction, thereby achieving fluidized bed with no external wastewater discharge.

[0098] To facilitate the rapid discharge of crystalline particles and impurities intercepted by the coarse and fine sand layers during water backwashing, air scrubbing is performed first. The air supply device delivers compressed air through the air supply pipe 9 between the guide plate 511 and the water distribution plate 513 within the filtration zone. The compressed air enters through the inlet of the water distribution nozzle 514 on the water distribution plate 513 and exits through the outlet of the nozzle 514. The outflowing compressed air enters the coarse and fine sand layers, causing them to expand under the airflow, thus facilitating the subsequent backwashing of crystalline particles and impurities intercepted by the coarse and fine sand layers. The compressed air is then discharged from the fluidized bed 1 through the exhaust port 13 located at the top of the fluidized bed 1. After air scrubbing, the air supply pipe 9 and the exhaust port 13 are sealed, and the fluid control device 4 is activated sequentially for water backwashing.

[0099] Differential pressure detection instruments are installed at the top and bottom of the filter media layer. When the differential pressure detection instrument reaches the set differential pressure value, such as ΔP = 0.1MPa, the air wiping program and the fluid control device 4 action program are started in sequence to realize automatic air wiping and automatic water backwashing of the filter area.

[0100] like Figure 3 As shown, in order to accelerate flocculation and crystallization, the flocculation device 2 includes: an outer flocculation cylinder 21, an inner flocculation cylinder 22, and a stirring assembly 23;

[0101] The flocculation outer cylinder 21 is open at one end and is located in the flocculation zone of the fluidized bed 1. The open end of the flocculation outer cylinder 21 is oriented towards the suspension zone. An annular mud passage is formed between the outer cylinder wall of the flocculation outer cylinder 21 and the inner cylinder wall of the fluidized bed 1.

[0102] The inner flocculation cylinder 22 is fitted inside the outer flocculation cylinder 21, and an annular circulation zone is formed between the outer flocculation cylinder 21 and the inner flocculation cylinder 22. The inner cavity of the inner flocculation cylinder 22 serves as the flocculation chamber 20, which is connected to the circulation zone. Under negative pressure, the high-suspended solids water and sludge particles entering the flocculation chamber 20 can circulate between the flocculation chamber 20 and the circulation zone for crystallization and granulation.

[0103] The stirring assembly 23 is disposed inside the flocculation inner cylinder 22 and is used to stir the movement of the highly suspended water and sludge particles entering the flocculation chamber 20 to form a mud-water mixture containing crystalline particles and liquid.

[0104] The stirring assembly 23 includes: a stirring shaft 231 and a stirring driver 232;

[0105] The stirring shaft 231 has a stirring end and an installation end. The installation end is rotatably disposed outside the fluidized bed 1. The stirring end enters the fluidized bed 1, passes through the sludge zone, and extends into the flocculation chamber 20. The rotation of the stirring shaft 231 can agitate the high suspended solids water and sludge particles.

[0106] The stirring driver 232 is mounted on the fluidized bed 1 and is used to drive the stirring shaft 231 to rotate.

[0107] The stirring assembly 23 further includes: a stirring drive wheel 233 and a stirring driven wheel 234;

[0108] The stirring drive wheel 233 is mounted on the drive shaft of the stirring driver 232, and the stirring driven wheel 234 is mounted on the mounting end of the stirring shaft 231. The stirring drive wheel 233 and the stirring driven wheel 234 mesh together. The stirring driver 232 drives the stirring drive wheel 233 to rotate, thereby driving the stirring driven wheel 234 and the stirring shaft 231 to rotate.

[0109] After sludge particles and highly suspended solids enter the flocculation chamber 20, as... Figure 3 , Figure 5 and Figure 6As shown, the drive shaft of the stirring driver 232 rotates, driving the stirring drive wheel 233, the stirring driven wheel 234, and the stirring shaft 231 mounted on the drive shaft to rotate. The rotation of the stirring shaft 231 agitates the sludge particles and the high-suspended-solids water to increase the speed of flocculation and crystallization. To further improve the crystallization efficiency, multiple stirring blades 235 are arranged along the axial direction of the stirring shaft 231 to quickly and uniformly drive the sludge particles and the high-suspended-solids water to move, thereby improving the efficiency of flocculation and crystallization. The opening of the outer flocculation cylinder 21 facing the suspension zone is trumpet-shaped. The outer cylinder wall of the outer flocculation cylinder 21 is fixed to the inner cylinder wall of the fluidized bed 1 by multiple connecting short rods. The inner flocculation cylinder 22 is a cylinder with openings at both ends. The inner flocculation cylinder 22 is also fixed to the outer flocculation cylinder 21 by multiple connecting short rods. The opening is equipped with a guide ring 24, which is funnel-shaped. The bottom axial section of the flocculation outer cylinder 21 is W-shaped. Under the action of negative pressure and the combined effect of the guide ring 24 and the W-shaped bottom plate structure of the flocculation outer cylinder 21, it is convenient for sludge particles and water with high suspended solids to circulate between the flocculation chamber 20 and the circulation zone, thereby accelerating the crystallization efficiency. The funnel-shaped structure at the opening end of the flocculation outer cylinder 21 allows sludge particles with larger suspended weights in the suspended zone to settle more easily through the sludge channel to the sludge zone under the action of gravity. Since the sludge zone, flocculation zone and suspended zone are connected, the water with high suspended solids entering through the lower water distribution ring 31 will fill the sludge zone, flocculation zone and suspended zone. In this way, the negative pressure device 3 generates negative pressure to draw sludge particles in the sludge zone into the flocculation chamber 20, while water with high suspended solids that has been retained in the sludge zone will re-enter the flocculation chamber 20.

[0110] A turbidity meter is installed in the suspended zone, and the meter is interlocked with the regulating actuator 621. When the turbidity in the suspended zone is high, such as ≥5 NTU, the regulating actuator 621 operates, causing the regulating sleeve 63 to move downward, increasing the opening of the self-priming particle inlet, thereby increasing the sludge particle return flow rate. This enhances the flocculation reaction in the flocculation chamber 20 by increasing the sludge particle content. When the turbidity in the suspended zone is low, such as <5 NTU, the water quality is good. The regulating actuator 621 operates, causing the regulating sleeve 63 to move upward, decreasing the opening of the self-priming particle inlet, thereby reducing the sludge particle return flow rate.

[0111] In one embodiment, such as Figures 6-8 As shown, the negative pressure device 3 includes: a lower water distribution ring 31 and multiple self-priming devices 32;

[0112] The lower water distribution ring 31 has a lower water distribution inlet and a lower water distribution outlet in the same number as the self-primer 32. The lower water distribution inlet is connected to the water supply device.

[0113] Multiple self-priming devices 33 are evenly distributed circumferentially along the stirring shaft 231. The self-priming devices 32 are used to generate negative pressure. Each self-priming device 32 has a self-priming inlet, a self-priming outlet, and multiple self-priming particle inlets. The self-priming inlet of each self-priming device 32 is connected to the corresponding lower water distribution outlet, and the self-priming outlet of each self-priming device 32 is connected to the flocculation chamber 20. High suspended solids water enters from the self-priming inlet and exits from the self-priming outlet into the flocculation chamber 20. Sludge particles enter from the self-priming particle inlets and exit from the self-priming outlet into the flocculation chamber 20.

[0114] The bottom of the flocculation outer cylinder 21 has the same number of through holes as the self-primers 32. Each water distribution outlet of the lower water distribution ring 31 is connected to a self-primer via a connecting pipe 33. Figure 8 As shown, the self-priming device 32 has a lower self-priming part and an upper self-priming part. A self-priming cavity 321 is provided in the lower self-priming part, and a self-priming hole 322 is provided in the upper self-priming part. The self-priming hole 322 is a conical hole, with its small end communicating with the self-priming cavity 321. The self-priming outlet is located at the large end port of the self-priming hole 322. The large end port of the upper self-priming part of the self-priming device 32 passes through the corresponding through hole at the bottom of the flocculation outer cylinder 21 and extends into the flocculation cavity 20. The connecting pipe 33 extends into the self-priming cavity 321. 3. The end port extending into the self-priming chamber 321 gradually narrows. After the high suspended solids water enters the lower water distribution ring 31, connecting pipe 33, self-priming chamber 321 and self-priming hole 322, it enters the flocculation chamber 20. A strip-shaped hole is opened on the cavity wall of the self-priming chamber 321 at the lower part of the self-priming chamber as the inlet of the self-priming particles. Under the action of the negative pressure generated by the negative pressure structure, the sludge particles in the sludge zone enter the self-priming chamber 321 through the self-priming particle inlet, and then enter the flocculation chamber 20 through the self-priming hole 322.

[0115] In order to control the amount of seed crystals entering the flocculation chamber 20, such as Figures 9-11 As shown, the adjustment device 6 includes: a main sleeve 61, an adjustment drive mechanism 62, and adjustment sleeves 63 in the same number as the self-priming device 32;

[0116] The main sleeve 61 is fitted onto the stirring shaft 231 and can move along the axial direction of the stirring shaft 231;

[0117] Multiple adjusting sleeves 63 are connected to the main sleeve 61 and are evenly distributed and fitted on the corresponding self-priming device 32 along the circumference of the main sleeve 61. The adjusting sleeves 63 can adjust the opening degree of the self-priming particle inlet on the corresponding self-priming device 32 during the process of the main sleeve 61 moving along the axial direction of the stirring shaft 231.

[0118] The adjusting transmission mechanism 62 is disposed on the fluidized bed 1 and is used to drive the main sleeve 61 to move axially along the stirring shaft 231.

[0119] The adjusting transmission mechanism 62 includes: an adjusting driver 621, an adjusting gear 622, and an adjusting rack 623;

[0120] The adjusting rack 623 is fixed on the main sleeve 61 along the axial direction of the main sleeve 61;

[0121] The adjusting gear 622 is mounted on the drive shaft of the adjusting driver 621 and meshes with the adjusting rack 623. The rotation of the adjusting gear 622 can drive the adjusting rack 623 and the main sleeve 61 to move along the axial direction of the stirring shaft 231.

[0122] The regulating driver 621 is disposed on the fluidized bed 1 and is used to drive the regulating gear 622 to rotate.

[0123] An adjusting sleeve 63 is fitted onto the lower part of each self-priming device 32. Each adjusting sleeve 63 is connected to a main sleeve 61 mounted on the stirring shaft 231. An adjusting driver 621 mounted on the fluidized bed 1 drives an adjusting gear 622 to rotate, thereby driving an adjusting rack 623 mounted on the main sleeve 61 to move the main sleeve 61 axially along the stirring shaft 231. This allows the adjusting sleeve 63 to adjust the opening of the self-priming particle inlet as it moves with the main sleeve 61, thus adjusting the number of sludge particles entering the flocculation chamber 20. Figures 9-11 As shown, two sets of adjustment drive mechanisms 62 are symmetrically arranged along the axial center line of the main sleeve 61 to drive the main sleeve 61 to move the adjustment sleeve 63.

[0124] To prevent sludge particles from depositing in the sludge zone at the bottom of fluidized bed 1 and affecting the amount of seed crystals entering flocculation chamber 20, such as... Figure 5 As shown, the circulating crystallization granulation solid-liquid separation fluidized bed system further includes: a scraper assembly 7, which is disposed in the sludge zone;

[0125] The stirring driver 232 is also used to drive the scraper assembly 6 to rotate in order to scrape up the sludge particles in the sludge zone.

[0126] The scraper assembly 7 includes: a scraper sleeve 71, a scraper blade 72, a scraper drive wheel 73, and a scraper driven wheel 74;

[0127] The sludge scraper sleeve 71 is rotatably mounted on the shaft of the stirring shaft 231 located in the sludge zone;

[0128] The scraper blade 72 is mounted on the scraper sleeve 71 and is used to scrape up sludge particles.

[0129] The mud scraper driven wheel 74 is fitted onto the mud scraper sleeve 71;

[0130] The active scraper wheel 73 is mounted on the drive shaft of the stirring driver 232. The active scraper wheel 73 meshes with the driven scraper wheel 74. The rotation of the active scraper wheel 73 drives the driven scraper wheel 74, the scraper sleeve 71 and the scraper plate 72 to rotate, thereby scraping up the sludge particles.

[0131] The stirring driver 232 is also used to drive the scraper drive wheel 73 to rotate.

[0132] The stirring drive 232 drives the stirring shaft 231 to rotate, which in turn drives the sludge scraping drive wheel 73 mounted on the drive shaft to rotate. This, in turn, causes the sludge scraping driven wheel 74, sludge scraping sleeve 71, and sludge scraping plate 72 to rotate. As a result, the sludge particles deposited at the bottom of the fluidized bed 1 are scraped up by the sludge scraping plate 72, so that the sludge particles are suspended in the sludge zone. This makes it easier for a sufficient amount of sludge particles to be drawn into the flocculation chamber 20 to form crystal particles under negative pressure. The sludge scraping sleeve 71 can rotate on the stirring shaft 231. Therefore, the sludge scraping sleeve 71 and the stirring shaft 231 do not interfere with each other when they rotate.

[0133] The circulating crystallization granulation solid-liquid separation fluidized bed system provided by this invention uses sludge particles falling into the sludge zone as seed crystals and sends them into the flocculation chamber to be fully mixed with water containing high suspended solids to form crystal particles. This avoids the need to add extra micro-sand during the crystallization granulation process and solves the problem of severe wear on sludge conveying equipment components caused by the addition of micro-sand during the crystallization granulation process in the prior art. It also realizes self-crystallization inside the fluidized bed.

[0134] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0135] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0136] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0137] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A circulating crystallization granulation solid-liquid separation fluidized bed system, characterized in that, The circulating crystallization granulation solid-liquid separation fluidized bed system includes: The fluidized bed (1) has a filtration zone, a suspension zone, a flocculation zone and a sludge zone arranged sequentially from top to bottom. The filtration zone and the suspension zone are separated by a partition (11). The suspension zone, the flocculation zone and the sludge zone are connected. The sludge zone is used to collect sludge particles as seed crystals. The flocculation device (2) has a flocculation chamber (20) and is set in the flocculation zone. A sludge passage is formed between the outer wall of the flocculation device (2) and the inner wall of the fluidized bed (1). The flocculation device (2) is used to stir the high suspended solids water and sludge particles entering the flocculation chamber (20) to form a mud-water mixture with crystalline particles and liquid. The mud-water mixture enters the suspension zone and converges to form a sludge suspension layer and suspension zone water. Large sludge particles in the sludge suspension layer fall back into the sludge zone through the mud passage. A negative pressure device (3) is installed in the sludge zone to generate negative pressure. Under the action of negative pressure, the sludge particles in the sludge zone enter the flocculation chamber (20) through the negative pressure device (3), the mud-water mixture enters the suspension zone, and the water produced in the suspension zone enters the filtration zone. A water supply device is connected to the negative pressure device (3) and is used to deliver water with high suspended solids into the flocculation chamber (20) through the negative pressure device (3); The regulating device (6) is movably mounted on the negative pressure device (3) and is used to regulate the amount of sludge particles entering the flocculation chamber (20) through the negative pressure device (3); the suspended zone is equipped with a water quality turbidity detection instrument, and the regulating device (6) is interlocked with the water quality turbidity detection instrument. The filter device (5) is installed in the filtration zone to filter the suspended water entering the filtration zone to generate clean water; A fluid control device (4) is used to send the suspended zone permeate into the filtration zone, thereby further filtering the suspended zone permeate through the filtration device (5) to generate and export purified water; the fluid control device (4) includes a valve body (41), a first valve core (42), and a second valve core (43). The valve body (41) has a valve cavity, on which a first water inlet (411), a second water inlet (412), a third water inlet (413), a fourth water inlet (414), and a fifth water inlet (415) are provided. The first valve core (42) and the second valve core (43) are... The core (43) is slidably disposed in the valve cavity and divides the valve cavity into an independent upper control sub-cavity (44), an intermediate sub-cavity (45) and a lower control sub-cavity (46). By controlling the movement of the first valve core (42) and the second valve core (43) in the valve cavity, the connection or disconnection between each water outlet can be controlled, so as to send the suspended zone water into the filtration zone for permeation filtration from bottom to top to generate clean water and export it during normal filtration, and to make the water flow from top to bottom to flush the filtration zone and send the flushed impurities into the flocculation chamber (20) during backwashing.

2. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 1, characterized in that, The circulating crystallization granulation solid-liquid separation fluidized bed system further includes: an upper water distribution ring (8) having an upper water distribution outlet and multiple upper water distribution inlets, the multiple upper water distribution inlets being connected to the suspension zone, and the fluid control device (4) being connected to the suspension zone by connecting to the upper water distribution outlet of the upper water distribution ring (8).

3. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 1, characterized in that, The filtration device (5) includes: filter media, water distribution assembly (51), water collection tray (52) and drain pipe (53); The filter media is laid in layers in the filtration zone, and the suspended water entering the filtration zone is filtered through the filter media to generate purified water. The water distribution assembly (51) is embedded in the filter media, located above the partition (11), and connected to the fluid control device (4) for uniformly distributing the suspended water entering the filtration zone; The water collection tray (52) is located above the filter media in the filtration zone and is used to collect purified water. One end of the drain pipe (53) is connected to the water collection tray (52), and the other end is connected to the fluid control device (4). The clean water collected by the water collection tray (52) enters the fluid control device (4) through the drain pipe (53).

4. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 3, characterized in that, The water distribution assembly (51) includes: a flow guide plate (511), a flow guide pipe (512), a water distribution plate (513), and multiple water distribution nozzles (514). The guide plate (511) is fixed on the partition plate (11). One end of the guide pipe (512) is connected to the fluid control device (4), and the other end extends between the guide plate (511) and the partition plate (11). The water produced in the suspended zone enters the filtration zone through the guide pipe (512). The water distribution plate (513) is located above the flow guide plate (511). The water distribution plate (513) has multiple water distribution holes, and each water distribution hole is provided with a water distribution nozzle (514). Each water distribution nozzle (514) has multiple water inlets and multiple water outlets. The multiple water inlets are located between the water distribution plate (513) and the guide plate (511), and the multiple water outlets are located above the water distribution plate (513).

5. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 4, characterized in that, The circulating crystallization granulation solid-liquid separation fluidized bed system also includes: an air supply device; The air supply device includes an air supply pipe (9), one end of which extends between the guide plate (511) and the water distribution plate (513). The air supply device supplies compressed air to the filtration zone through the air supply pipe (9).

6. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 1, characterized in that, The flocculation device (2) includes: an outer flocculation cylinder (21), an inner flocculation cylinder (22), and a stirring assembly (23). The outer flocculation cylinder (21) is open at one end and is set in the flocculation zone. The open end of the outer flocculation cylinder (21) is set towards the suspension zone. A mud passage is formed between the outer cylinder wall of the outer flocculation cylinder (21) and the inner cylinder wall of the fluidized bed (1). The inner flocculation cylinder (22) is fitted inside the outer flocculation cylinder (21), and an annular circulation zone is formed between the outer flocculation cylinder (21) and the inner flocculation cylinder (22). The inner cavity of the inner flocculation cylinder (22) serves as the flocculation chamber (20), and the flocculation chamber (20) is connected to the circulation zone. Under negative pressure, the high suspended solids water and sludge particles entering the flocculation chamber (20) can circulate between the flocculation chamber (20) and the circulation zone to perform crystallization and granulation. The stirring assembly (23) is disposed inside the flocculation inner cylinder (22) to agitate the movement of the high suspended solids water and sludge particles entering the flocculation chamber (20) to form a mud-water mixture with crystalline particles and liquid.

7. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 6, characterized in that, The stirring assembly (23) includes: a stirring shaft (231) and a stirring driver (232); The stirring shaft (231) has a stirring end and an installation end. The installation end is rotatably set outside the fluidized bed (1). The stirring end enters the fluidized bed (1), passes through the sludge zone, and extends into the flocculation chamber (20). The rotation of the stirring shaft (231) can agitate the high suspended solids water and sludge particles. The stirring driver (232) is mounted on the fluidized bed (1) and is used to drive the stirring shaft (231) to rotate.

8. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 7, characterized in that, The stirring assembly (23) further includes: a stirring drive wheel (233) and a stirring driven wheel (234); The stirring drive wheel (233) is mounted on the drive shaft of the stirring driver (232), and the stirring driven wheel (234) is mounted on the mounting end of the stirring shaft (231). The stirring drive wheel (233) and the stirring driven wheel (234) mesh with each other. The stirring driver (232) drives the stirring drive wheel (233) to rotate, thereby driving the stirring driven wheel (234) and the stirring shaft (231) to rotate.

9. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 8, characterized in that, The negative pressure device (3) includes: a lower water distribution ring (31) and multiple self-priming devices (32); The lower water distribution ring (31) has a lower water distribution inlet and a lower water distribution outlet in the same number as the self-priming device (32). The lower water distribution inlet is connected to the water supply device. Multiple self-primers (32) are evenly distributed around the circumference of the stirring shaft (231). The self-primers (32) are used to generate negative pressure. Each self-primer (32) has a self-priming inlet, a self-priming outlet and multiple self-priming particle inlets. The self-priming inlet of each self-primer (32) is connected to the corresponding lower water distribution outlet. The self-priming outlet of each self-primer (32) is connected to the flocculation chamber (20). High suspended solids water enters from the self-priming inlet and exits from the self-priming outlet into the flocculation chamber (20). Sludge particles enter from the self-priming particle inlet and exit from the self-priming outlet into the flocculation chamber (20).

10. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 9, characterized in that, The adjustment device (6) includes: a main sleeve (61), an adjustment drive mechanism (62), and adjustment sleeves (63) in the same number as the self-priming device (32). The main sleeve (61) is fitted onto the stirring shaft (231) and can move along the axial direction of the stirring shaft (231); Multiple adjusting sleeves (63) are connected to the main sleeve (61) and are evenly distributed and fitted on the corresponding self-priming device (32) along the circumference of the main sleeve (61). The adjusting sleeves (63) can adjust the opening degree of the self-priming particle inlet on the corresponding self-priming device (32) during the process of the main sleeve (61) moving along the axial direction of the stirring shaft (231). The adjustment drive mechanism (62) is disposed on the fluidized bed (1) and is used to drive the main sleeve (61) to move axially along the stirring shaft (231).

11. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 10, characterized in that, The adjustment drive mechanism (62) includes: an adjustment driver (621), an adjustment gear (622), and an adjustment rack (623). The adjusting rack (623) is fixed on the main sleeve (61) along the axial direction of the main sleeve (61); The adjusting gear (622) is mounted on the drive shaft of the adjusting driver (621) and meshes with the adjusting rack (623). The rotation of the adjusting gear (622) can drive the adjusting rack (623) and the main sleeve (61) to move along the axial direction of the stirring shaft (231). The regulating driver (621) is disposed on the fluidized bed (1) and is used to drive the regulating gear (622) to rotate.

12. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 11, characterized in that, The circulating crystallization granulation solid-liquid separation fluidized bed system further includes: a scraper assembly (7), which is disposed in the sludge zone; The stirring driver (232) is also used to drive the scraper assembly (7) to rotate to scrape up the sludge particles in the sludge zone.

13. The circulating crystallization granulation solid-liquid separation fluidized bed system according to claim 12, characterized in that, The scraper assembly (7) includes: a scraper sleeve (71), a scraper blade (72), a scraper drive wheel (73), and a scraper driven wheel (74). The sludge scraper sleeve (71) is rotatably mounted on the shaft of the stirring shaft (231) located in the sludge zone; The scraper blade (72) is mounted on the scraper sleeve (71) and is used to scrape up sludge particles. The driven wheel (74) for scraping mud is fitted onto the scraper sleeve (71); The active scraper wheel (73) is mounted on the drive shaft of the stirring driver (232). The active scraper wheel (73) meshes with the driven scraper wheel (74). The rotation of the active scraper wheel (73) drives the driven scraper wheel (74), the scraper sleeve (71) and the scraper plate (72) to rotate, thereby scraping up the sludge particles. The stirring driver (232) is also used to drive the scraper drive wheel (73) to rotate.

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