Efficient circulating crystallization granulation solid-liquid separation fluidized bed

Abstract

This invention provides a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed, relating to the field of water treatment technology. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed includes: a bed body; a flocculation device, located in the crystallization zone, used to drive the movement of high-suspended-solids influent and sludge particles to form a mud-water mixture containing crystalline particles and liquid; an influent water supply device, used to supply high-suspended-solids influent to the flocculation device; a negative pressure device, used to generate negative pressure, under which the high-suspended-solids influent and sludge particles enter the flocculation device through the negative pressure device, the mud-water mixture enters the suspension zone, and the permeate enters the filtration zone through the liquid passage holes of the partition; and a filtration device, located in the filtration zone, used to filter the permeate entering the filtration zone to generate and discharge purified water. This solves the problem in the prior art where the turbidity of the permeate produced by the solid-liquid separation fluidized bed increases, leading to frequent cleaning of the subsequent ultrafiltration system's influent self-cleaning filter.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and more specifically, to a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed. Background Technology

[0002] Existing crystallization granulation solid-liquid separation fluidized bed technologies require the addition of micro-sand as seed crystals, and the utilization rate of these seed crystals is relatively low. Furthermore, when treating low-temperature, low-turbidity water, solid-liquid separation fluidized beds exhibit slow particle growth in the flocculation reaction zone, resulting in poor stability of the agglomerated flocs. This makes it difficult to address the issues of insufficient suspended solids supply in low-turbidity water and the instability and easy destruction of agglomerated flocs in the flocculation reaction zone. Additionally, engineering practice has revealed that the suspended sludge layer within the solid-liquid separation fluidized bed is unstable, easily escaping with the water flow, leading to increased turbidity in the produced water. This, in turn, causes frequent cleaning of the subsequent ultrafiltration system's feedwater self-cleaning filter.

[0003] Current fluidized bed technology requires the addition of fine sand to provide high-density flocculation nuclei for the agglomerates in the flocculation zone, thereby increasing the density of the agglomerates. However, the sludge generated during flocculation after the addition of fine sand enters the sludge treatment system and eventually enters the plate and frame filter press system for sludge-water separation, ultimately remaining in the pressed filter cake. In practical engineering, it has been found that the presence of fine sand causes severe wear on the feed pump of the plate and frame filter press. The feed pump of the plate and frame filter press is usually a screw pump, and within a few weeks of operation, the stator and rotor, the core components of the screw pump, develop large-area scratches caused by fine sand. These scratches prevent the screw pump from maintaining normal pressure, thus causing the plate and frame filter press system to malfunction and stop operating properly.

[0004] Therefore, there is an urgent need for a device that can solve at least one of the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed to solve the problem in the prior art where the turbidity of the produced water from the solid-liquid separation fluidized bed increases, leading to frequent cleaning of the ultrafiltration system's feed water self-cleaning filtration after the produced water enters the ultrafiltration system.

[0006] To achieve the above objectives, the present invention provides a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed comprising:

[0007] The bed has a separation chamber, in which a filtration zone, a suspension zone, a crystallization zone and a sedimentation zone are arranged sequentially from top to bottom; a partition is provided between the filtration zone and the suspension zone, and the partition has liquid passage holes; the suspension zone, crystallization zone and sedimentation zone are connected in sequence; the sedimentation zone is used to collect sludge particles as seed crystals;

[0008] A flocculation device is installed in the crystallization zone. A sludge passage is formed between the outer wall of the flocculation device and the cavity wall of the separation chamber. The flocculation device is used to drive the movement of water with high suspended solids and sludge particles to form a mud-water mixture with crystallized particles and liquid. The mud-water mixture enters the suspension zone and converges to form a sludge suspension layer composed of sludge particles and permeate above the sludge suspension layer. Large sludge particles in the sludge suspension layer fall back into the sedimentation zone through the sludge passage.

[0009] A water supply device is used to supply high-suspended-solids water to the flocculation device;

[0010] A negative pressure device is connected to the flocculation device and the incoming water supply device, and is also connected to the sedimentation zone. The negative pressure device is used to generate negative pressure, which causes the high suspended solids incoming water and the sludge particles to enter the flocculation device through the negative pressure device, the mud-water mixture to enter the suspension zone, and the permeate to enter the filtration zone through the liquid passage holes of the partition.

[0011] A filtration device, located in the filtration zone, is used to filter the product water entering the filtration zone to generate and discharge clean water.

[0012] Specifically, the flocculation device includes: an outer flocculation cylinder, an inner flocculation cylinder, and a stirring assembly;

[0013] The outer flocculation cylinder is open at one end and is located in the crystallization zone; the open end of the outer flocculation cylinder faces the suspension zone, and a sludge passage is formed between the outer cylinder wall of the outer flocculation cylinder and the inner cylinder wall of the fluidized bed.

[0014] The inner flocculation cylinder is sleeved inside the outer flocculation cylinder, and an annular circulation zone is formed between the outer flocculation cylinder and the inner flocculation cylinder. The inner cavity of the inner flocculation cylinder serves as a flocculation chamber, and the flocculation chamber is connected to the circulation zone. Under negative pressure, high suspended solids water and sludge particles enter the flocculation chamber and circulate between the flocculation chamber and the circulation zone for crystallization and granulation.

[0015] The stirring assembly is installed inside the flocculation inner cylinder to agitate the high-suspended-solids water and sludge particles entering the flocculation chamber, forming a mud-water mixture containing crystalline particles and liquid.

[0016] Specifically, the stirring assembly includes: a stirring shaft and a stirring driver;

[0017] The stirring shaft has a stirring end and a mounting end. The mounting end is rotatably disposed outside the bed body. The stirring end enters the bed body, passes through the sedimentation zone, and extends into the flocculation chamber. The rotation of the stirring shaft can agitate the movement of water with high suspended solids and sludge particles.

[0018] The stirring driver is mounted on the bed and is used to drive the stirring shaft to rotate.

[0019] Specifically, the stirring assembly further includes: a stirring drive wheel and a stirring driven wheel;

[0020] 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.

[0021] Specifically, the negative pressure device includes: a water distribution ring and multiple self-priming devices;

[0022] The water distribution ring has a lower water distribution inlet and a lower water distribution outlet with the same number as the self-primer. The lower water distribution inlet is connected to the water supply device.

[0023] Multiple self-primers are evenly distributed circumferentially along the stirring shaft. 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. The self-primers are used to generate negative pressure. High suspended solids water enters from the self-priming inlet and exits from the self-priming outlet to enter the flocculation chamber. Sludge particles enter from the self-priming particle inlets and exit from the self-priming outlet to enter the flocculation chamber.

[0024] Specifically, the filtration device includes: filter media, water distribution assembly, water collection tray and drain pipe;

[0025] The filter media is laid in layers in the filtration zone, and the water entering the filtration zone is filtered by the filter media to generate purified water.

[0026] The water distribution assembly is embedded in the filter media and located above the partition plate, and is used to evenly distribute the produced water entering the filtration zone;

[0027] The water collection tray is located above the filter media in the filtration zone and is used to collect purified water.

[0028] One end of the drain pipe is connected to the water collection tray, and the other end extends out of the separation chamber. The clean water collected in the water collection tray is discharged through the drain pipe.

[0029] Specifically, the water distribution assembly includes: a guide plate, a water distribution plate, and multiple water distribution nozzles;

[0030] The guide plate is fixed on the partition plate above the liquid passage hole, and the product water enters the filtration zone through the liquid passage hole;

[0031] The water distribution plate is positioned above the flow guide plate, and the water distribution plate has multiple water distribution holes, with a water distribution nozzle installed at each water distribution hole.

[0032] Each water distribution nozzle has multiple water inlets and multiple water outlets. The multiple water inlets are located between the water distribution plate and the guide plate, and the multiple water outlets are located above the water distribution plate.

[0033] Specifically, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed further includes: an air supply device;

[0034] The air supply device includes an air supply pipe, one end of which extends between the guide plate and the water distribution plate. The air supply device supplies compressed air to the filtration zone through the air supply pipe.

[0035] Specifically, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed further includes: an adjustment device, movably mounted on the negative pressure device, used to adjust the amount of sludge particles entering the crystallization device via the negative pressure device.

[0036] 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;

[0037] The main sleeve is fitted onto the stirring shaft and can move along the axial direction of the stirring shaft;

[0038] Multiple adjusting sleeves are connected to the main sleeve and are evenly distributed and fitted on the corresponding self-priming devices 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.

[0039] The adjusting transmission mechanism is mounted on the bed and is used to drive the main sleeve to move axially along the stirring shaft.

[0040] Specifically, the adjusting transmission mechanism includes: an adjusting driver, an adjusting gear, and an adjusting rack;

[0041] The adjusting rack is fixed to the main sleeve along the axial direction of the main sleeve;

[0042] 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.

[0043] The adjustment driver is mounted on the bed and is used to drive the adjustment gear to rotate.

[0044] The present invention provides a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed. The separation chamber of the bed is divided into a filtration zone, a suspension zone, a crystallization zone, and a sedimentation zone from top to bottom. The suspension zone, crystallization zone, and sedimentation zone are interconnected. A partition is set between the filtration zone and the suspension zone, and liquid passage holes are opened on the partition. A negative pressure device set in the sedimentation zone generates negative pressure. Under the negative pressure suction, the high suspended solids water supplied by the water supply device and the sludge particles used as seed crystals in the sedimentation zone are sent to the flocculation device set in the crystallization zone. The flocculation device agitates the high suspended solids water and sludge particles to crystallize and granulate, forming a mud-water mixture with crystal particles and liquid. The mud-water mixture enters the suspension zone and converges to form a sludge suspension layer and permeate. The permeate enters the filtration zone through the liquid passage holes. The permeate is filtered by the filtration device set in the filtration zone to generate and discharge clean water. The filtered clean water is sent to the ultrafiltration system. This solves the problem in the prior art where the turbidity of the permeate produced by the solid-liquid separation fluidized bed increases, leading to frequent cleaning of the influent self-cleaning filter of the ultrafiltration system after the permeate enters the ultrafiltration system.

[0045] 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

[0046] 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:

[0047] Figure 1 This is a schematic diagram of the structure of the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the crystallization zone in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiments of the present invention;

[0049] Figure 3 This is a schematic diagram of the scraper assembly in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiments of the present invention;

[0050] Figure 4 This is an assembly diagram of the negative pressure device in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiments of the present invention;

[0051] Figure 5 This is a schematic diagram of the negative pressure device in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiments of the present invention;

[0052] Figure 6 This is a cross-sectional view of the self-primer in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in this embodiment of the invention;

[0053] Figure 7 This is a schematic diagram of the regulating device in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiments of the present invention;

[0054] Figure 8 This is a schematic diagram showing that the regulating device in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in this embodiment of the invention does not completely block the inlet of the self-aspirating particles;

[0055] Figure 9 This is a schematic diagram of the regulating device completely blocking the self-aspirating particle inlet in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in this embodiment of the invention;

[0056] Figure 10 This is a schematic diagram of the water distribution plate in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided in the embodiment of the present invention.

[0057] Explanation of reference numerals in the attached figures

[0058] 1-Bed body; 2-Flocculation device; 3-Negative pressure device; 5-Filtration device; 6-Regulating device; 7-Scraper assembly; 9-Air supply pipe; 11-Baffle; 13-Exhaust port; 14-Sludge discharge port; 16-Filtration zone; 17-Suspension zone; 18-Crystallization zone; 19-Sedimentation zone; 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 teeth; 31-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; 531-Clean water outlet; 54-Wastewater collection pipe; 541-Wastewater outlet; 511-Guide plate; 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. Detailed Implementation

[0059] 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.

[0060] Figure 1 This is a schematic diagram of the structure of a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 2 This is a schematic diagram of the crystallization zone in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 3 This is a schematic diagram of the scraper assembly in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 4 This is an assembly diagram of the negative pressure device in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 5 This is a schematic diagram of the negative pressure device in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 6 This is a cross-sectional view of the self-primer in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 7 This is a schematic diagram of the regulating device in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed; Figure 8 This is a schematic diagram showing that the regulating device in the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed is not completely blocked from the self-priming particle inlet; Figure 9 This is a schematic diagram showing the complete sealing of the self-priming particle inlet by the regulating device in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed. Figure 10 This is a schematic diagram of the water distribution plate in a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed.

[0061] like Figures 1-10 As shown, the present invention provides a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed comprising:

[0062] The bed 1 has a separation chamber, which is sequentially provided with a filtration zone 16, a suspension zone 17, a crystallization zone 18 and a sedimentation zone 19. A partition 11 is provided between the filtration zone 16 and the suspension zone 17. The partition 11 has liquid passage holes. The suspension zone 17, the crystallization zone 18 and the sedimentation zone 19 are connected. The sedimentation zone 19 is used to collect sludge particles as seed crystals.

[0063] A flocculation device 2 is installed in the crystallization zone 18. A sludge passage is formed between the outer wall of the flocculation device 2 and the cavity wall of the separation chamber. The flocculation device 2 is used to drive the movement of water with high suspended solids and sludge particles to form a mud-water mixture with crystallized particles and liquid. The mud-water mixture enters the suspension zone 17 and converges to form a sludge suspension layer composed of sludge particles and permeable water above the sludge suspension layer. Large sludge particles in the sludge suspension layer fall back into the sedimentation zone 19 through the sludge passage.

[0064] A water supply device is used to supply high-suspended-solids water to the flocculation device 2;

[0065] The negative pressure device 3 is connected to the flocculation device 2 and the water supply device, and is also connected to the sedimentation zone 19. The negative pressure device 3 is used to generate negative pressure. Under the action of negative pressure, the high suspended solids water and the sludge particles enter the flocculation device 2 through the negative pressure device 3, the mud-water mixture enters the suspension zone 17, and the permeate enters the filtration zone 16 through the liquid passage of the partition 11.

[0066] The filter device 5 is installed in the filter zone 16 and is used to filter the product water entering the filter zone 16 to generate and discharge clean water.

[0067] The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed provided by this invention, such as... Figure 1 As shown, the bed 1 is a hollow cylindrical structure, vertically arranged, and has a separation chamber. A filtration zone 16, a suspension zone 17, a crystallization zone 18, and a sedimentation zone 19 are arranged sequentially from top to bottom within the separation chamber. A partition 11 is provided between the filtration zone 16 and the suspension zone 17, and a liquid passage hole is provided on the partition 11. A negative pressure device 3 located in the sedimentation zone 19 generates negative pressure. Under the action of negative pressure, the sludge particles in the sedimentation zone 19 enter the flocculation device 2 through the negative pressure device 3. At the same time, the incoming water supply device also supplies water to the flocculation device 2 through the negative pressure device 3. The incoming water has a high suspended solids content, meaning it has high turbidity. The flocculation device 2 moves the sludge particles and the incoming water, forming a mud-water mixture containing crystalline particles and liquid. This mixture enters the suspension zone 17, where it converges to form a sludge suspension layer composed of flocculated sludge particles and permeate. The permeate is above the sludge suspension layer. The sludge suspension layer, formed earlier, can also filter subsequent mud-water mixtures entering the suspension zone 17. The sludge particles in the sludge-water mixture continuously aggregate in the sludge suspension layer. After a period of aggregation, the heavier sludge particles fall back into the sedimentation zone 19 under their own gravity. A small portion of the sludge particles falling into the sedimentation zone 19 serve as seed crystals for subsequent crystallization and granulation, while the majority are discharged through the sludge discharge port 14 of the sedimentation zone 19. The permeate in the suspension zone 17 enters the filtration zone 16 through the liquid passage. The filtration device 5 filters the permeate entering the filtration zone 16. After removing impurities from the permeate, purified water is generated and discharged. The purified water then enters the ultrafiltration system for filtration. This solves the problem in the prior art where the turbidity of the permeate produced by the solid-liquid separation fluidized bed increases, leading to frequent cleaning of the ultrafiltration system's inlet self-cleaning filter after the permeate enters the ultrafiltration system. At the same time, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed of this application does not require the addition of micro-sand during the crystallization granulation process. Thus, the sludge particles discharged from the sludge discharge port 14 are free of micro-sand, avoiding the problem of severe wear on the sludge conveying equipment components that transport sludge particles due to the addition of micro-sand.

[0068] To accelerate crystallization and granulation, the flocculation device 2 includes: an outer flocculation cylinder 21, an inner flocculation cylinder 22, and a stirring assembly 23;

[0069] The flocculation outer cylinder 21 is open at one end and is located in the crystallization zone 18. The open end of the flocculation outer cylinder 21 is positioned towards the suspension zone 17. A sludge passage is formed between the outer cylinder wall of the flocculation outer cylinder 21 and the inner cylinder wall of the fluidized bed 1.

[0070] 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 is a flocculation chamber 20, which is connected to the circulation zone. Under negative pressure, high suspended solids water and sludge particles enter the flocculation chamber 20 and circulate between the flocculation chamber 20 and the circulation zone for crystallization and granulation.

[0071] 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.

[0072] The stirring assembly 23 includes: a stirring shaft 231 and a stirring driver 232;

[0073] The stirring shaft 231 has a stirring end and an installation end. The installation end is rotatably disposed outside the bed body 1. The stirring end enters the bed body 1, passes through the sedimentation zone 19, and extends into the flocculation chamber 20. The rotation of the stirring shaft 231 can agitate the movement of water with high suspended solids and sludge particles.

[0074] The stirring driver 232 is mounted on the bed 1 and is used to drive the stirring shaft 231 to rotate.

[0075] The stirring assembly 23 further includes: a stirring drive wheel 233 and a stirring driven wheel 234;

[0076] 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.

[0077] like Figure 1 and Figure 2As shown, sludge particles and water with high suspended solids enter the flocculation chamber 20 of the flocculation device 2 for crystallization and granulation. 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 water with high suspended solids entering the flocculation chamber 20 to increase the crystallization speed. To further improve the crystallization efficiency, multiple stirring blades 235 are arranged along the axial direction of the stirring shaft 231 to agitate the sludge particles and water with high suspended solids so that they move quickly and uniformly, thereby improving the efficiency of flocculation and crystallization. The opening of the outer flocculation cylinder 21 facing the suspension zone 17 is funnel-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 short connecting 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 short connecting rods. A guide ring 24 is provided at one end facing the suspension zone 17. The guide ring 24 is funnel-shaped. The axial cross section of the bottom 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 can make the heavier sludge particles in the suspension zone 17 more likely to settle into the sedimentation zone 19 under the action of gravity. Since the sedimentation zone 19, the crystallization zone 18 and the suspension zone 17 are connected, the water with high suspended solids entering through the water distribution ring 31 will fill the sedimentation zone 19, the crystallization zone 18 and the suspension zone 17. In this way, while the negative pressure device 3 generates negative pressure to draw the sludge particles in the sedimentation zone 19 into the flocculation chamber 20, the water with high suspended solids that is retained in the sedimentation zone 19 will also re-enter the flocculation chamber 20.

[0078] like Figures 4-6 As shown, the negative pressure device 3 includes: a water distribution ring 31 and multiple self-priming devices 32;

[0079] The 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.

[0080] Multiple self-priming devices 32 are evenly distributed along the circumference of 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.

[0081] 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 water distribution ring 31 is connected to a self-primer via a connecting pipe 33, such as... Figure 6 As shown, the self-priming device 32 has a lower self-priming part and a higher 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, and its lower end communicates 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. The end of the connecting pipe 33 that extends into the self-priming chamber is tapered with a gradually narrowing opening. After the high suspended solids water enters the water distribution ring 31, the connecting pipe 33, the self-priming chamber 321 and the self-priming hole 322, it enters the flocculation chamber 20. A strip-shaped hole is opened on the wall of the self-priming chamber 321 as the inlet for the self-priming particles. Under the action of negative pressure, the sludge particles in the sedimentation zone 19 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.

[0082] In one embodiment, such as Figure 1 and Figure 10 In order to filter the produced water entering the filtration zone 16, the filtration device 5 includes: filter media, water distribution assembly 51, water collection tray 52 and drain pipe 53.

[0083] The filter media is laid in layers in the filtration zone 16, and the water entering the filtration zone 16 is filtered through the filter media to generate purified water.

[0084] The water distribution assembly 51 is embedded in the filter media and located above the partition 11, and is used to evenly distribute the produced water entering the filtration zone 16.

[0085] The water collection tray 52 is located above the filter media in the filtration zone 16 and is used to collect purified water.

[0086] One end of the drain pipe 53 is connected to the water collection tray 52, and the other end extends out of the separation chamber, through which the clean water collected in the water collection tray 52 is discharged.

[0087] The water distribution assembly 51 includes: a guide plate 511, a water distribution plate 513, and multiple water distribution nozzles 514;

[0088] The guide plate 511 is fixed on the partition plate 11 and located above the liquid passage hole. The produced water enters the filtration zone 16 through the liquid passage hole.

[0089] 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.

[0090] 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.

[0091] To filter crystalline particles and other impurities from the permeate water in the suspended zone 17, the filter media consists of coarse and fine sand. The coarse and fine sand are layered in the filtration zone 16, forming a coarse sand layer and a fine sand layer, with the coarse sand layer positioned below the fine sand layer. A mesh screen is installed between the coarse and fine sand layers, and also on top of the fine sand layer. This mesh screen prevents disturbance of the permeate water in the suspended zone 17 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. The permeate water from the suspended zone 17 enters the filtration zone 16 through the liquid passage holes. Under the guidance of the guide plate 511, it diffuses radially through the coarse sand layer in the filtration zone 16, then enters through the multiple inlets of the multiple distribution nozzles 514 and flows out from the multiple outlets of the multiple distribution nozzles 514. This allows the produced water to be evenly distributed in the coarse sand layer, facilitating better utilization of the coarse sand for filtration. The produced water filtered by the coarse sand passes upward through the fine sand layer. The purified water produced after filtration through the coarse and fine sand layers is collected in the water collection tray 52. ​​Finally, the purified water is discharged to the designated container through the drain pipe 53 connected to the water collection tray 52. ​​One end of the drain pipe 53 extending out of the separation chamber serves as the purified water outlet 531 of the filtration area. The purified water outlet 531 is connected to the designated container for collecting purified water. To facilitate the subsequent removal of crystal particles and impurities intercepted by the coarse and fine sand layers, a wastewater collection pipe 54 is installed at the end of the drain pipe 53 extending out of the separation chamber. One end of the wastewater collection pipe 54 is connected to the drain pipe 53, and the other end is connected to the wastewater collection container. The end of the wastewater collection pipe 54 connected to the wastewater collection container is the wastewater outlet 541.

[0092] To facilitate the removal of crystalline particles and impurities intercepted by the coarse and fine sand layers, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed also includes an air supply device.

[0093] 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 filter zone 16 through the air supply pipe 9.

[0094] To facilitate the rapid removal of crystalline particles and impurities intercepted in the coarse and fine sand layers, air scrubbing is first performed. 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 filter zone 16. The compressed air enters through the inlet of the water distribution nozzle 514 on the water distribution plate 513 and flows out through the outlet of the water distribution nozzle 514. The outflowing compressed air enters the coarse and fine sand layers, causing them to expand under the action of the compressed air flow. After expansion and air rinsing, the air supply pipe 9 and the exhaust port 13 located at the top of the bed 1 are sealed. Then, the coarse sand layer and the fine sand layer are subjected to forward water rinsing. During rinsing, the connection between the clean water outlet 531 and the designated container for collecting clean water is cut off, and the connection between the wastewater outlet 541 and the wastewater collection container is opened. The permeate from the suspension zone 17 flows from bottom to top through the coarse sand layer and the fine sand layer to perform forward rinsing of the filter media. The water flows through the water collection tray 52, the drain pipe 53, and the wastewater outlet 541 and is discharged. After the forward rinsing is completed, the connection between the clean water outlet 531 of the drain pipe 53 and the designated container for collecting clean water is opened, and the connection between the wastewater outlet 541 and the wastewater collection container is cut off to facilitate the normal external delivery of filtered clean water.

[0095] In order to control the amount of seed crystals entering the flocculation chamber 20, such as Figures 7-9 As shown, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed further includes: an adjustment device 6, which is movably mounted on the negative pressure device 3 and is used to adjust the amount of sludge particles entering the crystallization device 2 through the negative pressure device 3.

[0096] The adjustment device 6 includes: a main sleeve 61, an adjustment drive mechanism 62, and an adjustment sleeve 63 in the same number as the self-primer 32;

[0097] The main sleeve 61 is fitted onto the stirring shaft 231 and can move along the axial direction of the stirring shaft 231;

[0098] 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.

[0099] The adjusting transmission mechanism 62 is mounted on the bed 1 and is used to drive the main sleeve 61 to move axially along the stirring shaft 231.

[0100] The adjusting transmission mechanism 62 includes: an adjusting driver 621, an adjusting gear 622, and an adjusting rack 623;

[0101] The adjusting rack 623 is fixed on the main sleeve 61 along the axial direction of the main sleeve 61;

[0102] 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.

[0103] The adjustment driver 621 is mounted on the bed 1 and is used to drive the adjustment gear 622 to rotate.

[0104] 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 7-9 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.

[0105] To prevent sludge particles from settling in the sedimentation zone 19 at the bottom of the fluidized bed 1, such as... Figure 3 As shown, the high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed further includes: a scraper assembly 7, which is disposed in the sedimentation zone 19;

[0106] 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 sedimentation zone 19.

[0107] The scraper assembly 7 includes: a scraper sleeve 71, a scraper blade 72, a scraper drive wheel 73, and a scraper driven wheel 74;

[0108] The sludge scraper sleeve 71 is rotatably mounted on the shaft of the stirring shaft 231 located in the sedimentation zone 19;

[0109] The scraper blade 72 is mounted on the scraper sleeve 71 and is used to scrape up sludge particles.

[0110] The mud scraper driven wheel 74 is fitted onto the mud scraper sleeve 71;

[0111] 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.

[0112] The stirring driver 232 is also used to drive the scraper drive wheel 73 to rotate.

[0113] 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 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 sedimentation zone 19. This allows the sludge particles to be smoothly drawn into the flocculation chamber 20 under negative pressure to form crystal particles, and also allows most of the sludge in the sedimentation zone 19 to be smoothly discharged through the sludge discharge port 14.

[0114] The present invention provides a high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed. The separation chamber of the bed is divided into a filtration zone, a suspension zone, a crystallization zone, and a sedimentation zone from top to bottom. The suspension zone, crystallization zone, and sedimentation zone are interconnected. A partition is set between the filtration zone and the suspension zone, and liquid passage holes are opened on the partition. A negative pressure device set in the sedimentation zone generates negative pressure. Under the negative pressure suction, the high suspended solids water supplied by the water supply device and the sludge particles used as seed crystals in the sedimentation zone are sent to the flocculation device set in the crystallization zone. The flocculation device agitates the high suspended solids water and sludge particles to crystallize and granulate, forming a mud-water mixture with crystal particles and liquid. The mud-water mixture enters the suspension zone and converges to form a sludge suspension layer and permeate. The permeate enters the filtration zone through the liquid passage holes. The permeate is filtered by the filtration device set in the filtration zone to generate and discharge clean water. The filtered clean water is sent to the ultrafiltration system. This solves the problem in the prior art where the turbidity of the permeate produced by the solid-liquid separation fluidized bed increases, leading to frequent cleaning of the influent self-cleaning filter of the ultrafiltration system after the permeate enters the ultrafiltration system.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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 high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed, characterized in that, The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed includes: The bed (1) has a separation chamber, in which a filtration zone (16), a suspension zone (17), a crystallization zone (18), and a sedimentation zone (19) are arranged sequentially from top to bottom; a partition (11) is arranged between the filtration zone (16) and the suspension zone (17), and a liquid passage hole is opened on the partition (11); the suspension zone (17), the crystallization zone (18), and the sedimentation zone (19) are connected in sequence; the sedimentation zone (19) is used to collect sludge particles as seed crystals; A flocculation device (2) is set in the crystallization zone (18). A sludge passage is formed between the outer wall of the flocculation device (2) and the cavity wall of the separation chamber. The flocculation device (2) is used to drive the high suspended solids water and sludge particles to move and form a mud-water mixture with crystallized particles and liquid. The mud-water mixture enters the suspension zone (17) and converges to form a sludge suspension layer composed of sludge particles and permeate water above the sludge suspension layer. The large sludge particles in the sludge suspension layer fall back into the sedimentation zone (19) through the sludge passage. A water supply device is used to supply high-suspended-solids water to the flocculation device (2); The negative pressure device (3) is connected to the flocculation device (2) and the incoming water supply device, and is also connected to the sedimentation zone (19). The negative pressure device (3) is used to generate negative pressure, which causes the high suspended solids incoming water and the sludge particles to enter the flocculation device (2) through the negative pressure device (3), the mud-water mixture to enter the suspension zone (17), and the permeate to enter the filtration zone (16) through the liquid passage of the partition (11). A filter device (5) is installed in the filter zone (16) to filter the permeate water entering the filter zone (16) to generate and discharge clean water; The flocculation device (2) includes: an outer flocculation cylinder (21), an inner flocculation cylinder (22), and a stirring assembly (23); one end of the outer flocculation cylinder (21) is open and is located in the crystallization zone (18); the open end of the outer flocculation cylinder (21) faces the suspension zone (17), and a sludge passage is formed between the outer cylinder wall of the outer flocculation cylinder (21) and the inner cylinder wall of the bed (1); the inner flocculation cylinder (22) is fitted inside the outer flocculation cylinder (21), and a ring is formed between the outer flocculation cylinder (21) and the inner flocculation cylinder (22). The inner cavity of the inner flocculation cylinder (22) is a flocculation chamber (20), which is connected to the circulation zone. Under negative pressure, high suspended solids water and sludge particles enter the flocculation chamber (20) and circulate between the flocculation chamber (20) and the circulation zone for crystallization and granulation. The stirring assembly (23) is set inside the inner flocculation cylinder (22) to agitate the high suspended solids water and sludge particles entering the flocculation chamber (20) to form a mud-water mixture with crystallized particles and liquid. The stirring assembly (23) includes: a stirring shaft (231) and a stirring driver (232); the stirring shaft (231) has a stirring end and a mounting end, the mounting end is rotatably disposed outside the bed body (1), the stirring end enters the bed body (1), passes through the sedimentation zone (19) and extends into the flocculation chamber (20), and the stirring shaft (231) can agitate the high suspended solids water and sludge particles by rotating; the stirring driver (232) is disposed on the bed body (1) and is used to drive the stirring shaft (231) to rotate; The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed further includes: a scraper assembly (7) disposed in the sedimentation zone (19); 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 scraper sleeve (71) is rotatably mounted on the shaft of the stirring shaft (231) located in the sedimentation zone (19); the scraper blade (72) is disposed on the scraper sleeve (71); the scraper driven wheel (74) is mounted on the scraper sleeve (71); The sludge scraping drive wheel (73) is mounted on the drive shaft of the stirring driver (232), and the sludge scraping drive wheel (73) meshes with the sludge scraping driven wheel (74); the stirring driver (232) is also used to drive the stirring shaft (231) to rotate while driving the sludge scraping drive wheel (73) mounted on the drive shaft to rotate, thereby driving the sludge scraping driven wheel (74), sludge scraping sleeve (71) and sludge scraping plate (72) to rotate, so that the sludge particles deposited at the bottom of the bed (1) are scraped up by the sludge scraping plate (72) so that the sludge particles are suspended in the sedimentation zone (19). 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 (16), and the water entering the filtration zone (16) is filtered by the filter media to generate clean water; the water distribution assembly (51) is embedded in the filter media and located above the partition (11) for evenly distributing the water entering the filtration zone (16); the water collection tray (52) is set in the filtration zone (16) above the filter media for collecting clean water; one end of the drain pipe (53) is connected to the water collection tray (52), and the other end extends out of the separation chamber, and the clean water collected by the water collection tray (52) is discharged through the drain pipe (53); The water distribution assembly (51) includes: a guide plate (511), a water distribution plate (513), and multiple water distribution nozzles (514); the guide plate (511) is fixed on the partition plate (11) and located above the liquid passage hole, through which the produced water enters the filtration zone (16); the water distribution plate (513) is located above the guide plate (511), and multiple water distribution holes are provided on the water distribution plate (513), with a water distribution nozzle (514) provided at each water distribution hole; each water distribution nozzle (514) has multiple inlets and multiple outlets, with multiple inlets located between the water distribution plate (513) and the guide plate (511), and multiple outlets located above the water distribution plate (513).

2. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed according to claim 1, 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.

3. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed according to claim 2, characterized in that, The negative pressure device (3) includes: a water distribution ring (31) and multiple self-priming devices (32); The 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). 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, and the self-priming outlet of each self-primer (32) is connected to the flocculation chamber (20). The self-primers (32) are used to generate negative pressure. High suspended solids water enters from the self-priming inlet and exits from the self-priming outlet to enter the flocculation chamber (20). Sludge particles enter from the self-priming particle inlets and exit from the self-priming outlet to enter the flocculation chamber (20).

4. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed according to claim 1, characterized in that, The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed 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 filter zone (16) through the air supply pipe (9).

5. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed according to claim 1, characterized in that, The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed further includes: an adjustment device (6), which is movably set on the negative pressure device (3) and is used to adjust the amount of sludge particles entering the flocculation device (2) through the negative pressure device (3).

6. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed according to claim 5, characterized in that, The adjustment device (6) includes: a main sleeve (61), an adjustment transmission 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 transmission mechanism (62) is mounted on the bed (1) and is used to drive the main sleeve (61) to move axially along the stirring shaft (231).

7. The high-efficiency circulating crystallization granulation solid-liquid separation fluidized bed according to claim 6, characterized in that, The regulating transmission mechanism (62) includes: a regulating driver (621), a regulating gear (622), and a regulating 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 adjustment driver (621) is mounted on the bed (1) and is used to drive the adjustment gear (622) to rotate.

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