Chemical crystallization forced circulation granulation fluidized bed water treatment device

Abstract

The application provides a chemical crystallization forced circulation granulation fluidized bed water treatment device, which comprises an outer cylinder, an inner cylinder and an annular cavity with two open ends, the annular cavity is formed between the cylinder sidewall of the inner cylinder and the middle region of the cylinder sidewall of the outer cylinder, the water treatment device comprises a jet port, the jet port is communicated with the bottom region of the annular cavity, and the jet port is obliquely arranged to spray water to the bottom end opening of the annular cavity through the jet port obliquely inward and obliquely downward. The application has the advantages of forced circulation, high softening efficiency, low probability of "choke" failure, high utilization rate of crystal seeds, low consumption of crystal seeds, low probability of particle caking, compactness, small floor area, low construction and manufacturing cost, low operation and maintenance cost and the like.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a chemical crystallization forced circulation granulation fluidized bed water treatment device. Background Technology

[0002] Chemical crystallization is a commonly used method for softening and removing hardness in industrial circulating water. When using this method for softening and removing hardness, seed crystals are added to the chemical crystallization circulating granulation fluidized bed water treatment device, and the nucleation of the seed crystals is used to accelerate the softening reaction.

[0003] CN201510864696.7 discloses a typical chemical crystallization circulating granulation fluidized bed water treatment device. The circulation path of this water treatment device is:

[0004] High-hardness water and reagents are added to the bottom of the outer cylinder through a water distributor and a reagent distributor, respectively. Small seed crystals are added to the bottom region of the annular cavity between the outer and inner cylinders and fall from the open bottom end of the annular cavity, mixing with the high-hardness water. The high-hardness water mixed with reagents and seed crystals rises at a high flow rate into the fluidization zone of the inner cylinder.

[0005] Within the fluidized zone, a chemical de-crystallization reaction occurs, causing small seed crystals to continuously crystallize on their surface and grow into larger seed crystals. Furthermore, the fluidization process causes the small seed crystals to be on top and the larger seed crystals to be below.

[0006] The larger seed crystals at the bottom are discharged from the particle discharge pipe at the bottom of the outer cylinder. The smaller seed crystals at the top are turned over from the top of the inner cylinder into the annular cavity between the inner and outer cylinders, and then gradually sink downwards. They then fall down from the bottom opening of the annular cavity together with the newly added small seed crystals, and are flushed up again by the incoming high-hardness water to enter the fluidization zone to participate in the chemical hardening and crystallization reaction.

[0007] This water treatment device has the following drawbacks:

[0008] (1) Although the water treatment device is intended to form the above-mentioned circulation path of "liquid phase rising in the inner cylinder and liquid phase falling in the annular cavity", it is actually difficult to form the above-mentioned circulation path due to the influence of bottom turbulence. In fact, the liquid phase in the inner cylinder and the annular cavity both rise, and it is even possible that the rising speed of the liquid phase in the annular cavity is greater than that of the liquid phase in the inner cylinder. This makes it difficult for the small seed crystals that have been turned over from the top of the inner cylinder into the annular cavity and the newly added small seed crystals to fall from the bottom opening of the annular cavity, thus causing a "choking" fault.

[0009] (2) The upward flow velocity in the inner cylinder is not clearly defined, so it is not possible to screen large seed particles and small seed particles well. As a result, when large seed particles are discharged, small seed particles are also carried along, resulting in low seed utilization and high seed consumption.

[0010] (3) A sealing structure needs to be set between the seed feed pipe and the cylinder. The seed needs to be mixed with the fluid by a stirring device and then transported by a pumping device. Setting up a stirring device and a pumping device increases the construction and manufacturing cost. Moreover, the seed is usually a hard rock mineral, which will cause great wear and tear on the pumping device. Therefore, the pumping device needs to be replaced and repaired regularly, which also increases the operation and maintenance cost.

[0011] (4) Both the drug dispenser and the water dispenser are located in the bottom area of ​​the outer cylinder and both adopt a complex structure with interlayer, resulting in a lot of disturbance dead zones in the bottom area of ​​the outer cylinder, which makes it easy for particles to clump together, affecting fluidization and the discharge of large seed particles.

[0012] Therefore, how to avoid some or all of the above-mentioned drawbacks is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0013] To address the aforementioned problems, this application provides a chemical crystallization forced circulation granulation fluidized bed water treatment device. The water treatment device includes an outer cylinder, an inner cylinder, and an annular cavity with open ends. The annular cavity is formed between the middle region of the inner cylinder's sidewall and the outer cylinder's sidewall. The water treatment device includes a jet nozzle that communicates with the bottom region of the annular cavity. The jet nozzle is inclined to spray water obliquely inward and downward towards the bottom open end of the annular cavity.

[0014] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a bottom cylinder located in the bottom region of the outer cylinder and on the bottom side of the inner cylinder, wherein the inner diameter of the side wall of the bottom cylinder is smaller than the inner diameter of the side wall of the inner cylinder.

[0015] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes an annular conical plate. The top end of the side wall of the bottom cylinder is connected to the side wall of the outer cylinder through the annular conical plate. An annular gap for water jet passage is formed between the annular conical plate and the bottom end of the side wall of the inner cylinder. The annular conical plate is provided with an annular stepped surface, the top end of the annular stepped surface is inclined inward relative to the bottom end, and the jet outlet is provided on the annular stepped surface.

[0016] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a jet water chamber, a circulation pipeline, and a product water pump. The jet water chamber is connected to the jet outlet and is located inside the outer cylinder, formed by the side wall of the outer cylinder and the annular conical plate. The circulation pipeline is used to introduce a portion of the product water from the water treatment device into the jet water chamber, and the product water pump is connected to the circulation pipeline.

[0017] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a throttling element, wherein the inlet of the throttling element is connected to the circulation pipeline and the outlet serves as the product water outlet of the water treatment device.

[0018] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a buffer chamber and an annular baffle. The buffer chamber is located inside the outer cylinder. The annular baffle separates the jet water chamber from the buffer chamber. The cylinder wall of the outer cylinder, the side wall of the bottom cylinder, and the annular baffle form the buffer chamber. The circulation pipeline connects the jet water chamber and the buffer chamber.

[0019] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a water inlet assembly, which includes a water inlet spray pipe located in the bottom region of the outer cylinder, and a spray nozzle is provided at the bottom end of the water inlet spray pipe.

[0020] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes an annular overflow trough located in the top region of the outer cylinder.

[0021] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a dosing assembly. The dosing assembly includes an annular dosing manifold surrounding the outer cylinder and multiple dosing branch pipes arranged at intervals along the circumference. The dosing branch pipes pass through through holes on the annular stepped surface. The outer end of the dosing branch pipe is connected to the annular dosing manifold, and the inner end of the dosing branch pipe is provided with a spray nozzle. The spray nozzle is arranged adjacent to the jet port and is connected to the bottom region of the annular cavity. The spray nozzle is inclined to spray the agent obliquely inward and downward towards the bottom opening of the annular cavity.

[0022] One embodiment of a chemical crystallization forced circulation granulation fluidized bed water treatment device includes a seed crystal feeding assembly, which includes a feeding pipe. The feeding pipe has an inlet at its top and an outlet at its bottom. The inlet is located above the overflow port of the outer cylinder, and the outlet is located below the overflow port of the outer cylinder and above the overflow port of the inner cylinder.

[0023] This application utilizes a jet nozzle connected to the bottom region of an annular cavity, angled to spray water obliquely inward and downward towards the bottom opening of the annular cavity. This creates a low-pressure area at the bottom of the annular cavity, forcing the liquid phase within the cavity to descend, thus creating a forced circulation path of "liquid phase rising in the inner cylinder and descending in the annular cavity." Furthermore, it facilitates the falling of seed crystals from the bottom opening of the annular cavity, preventing clogging. The jet also compensates for the upward flow velocity of the inner cylinder, maintaining high fluidization efficiency. Since the raw water flows upward, the water sprayed from the jet nozzle and the chemical sprayed from the spray nozzle create a counter-current mixing effect, promoting uniform mixing of the chemical, seed crystals, and raw water. Additionally, the area around the spray nozzle is filled with treated soft water descending from the annular cavity, preventing scaling and clogging due to the softening reaction. Attached Figure Description

[0024] Figure 1 A schematic diagram of one embodiment of the water treatment apparatus provided in this application;

[0025] Figure 2 for Figure 1 AA view;

[0026] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0027] Figure 4 for Figure 1 The diagram shows the water flow path of the water treatment device.

[0028] Figure 5 for Figure 1 A schematic diagram of particle distribution and particle trajectory in the water treatment device shown.

[0029] The annotations in the attached figures are explained as follows:

[0030] 10 Outer cylinder, 20 Inner cylinder, 30 Annular cavity, 40 Bottom cylinder;

[0031] 50-ringed conical plate, 50a-ringed stepped surface;

[0032] 60 jet water chamber, 70 circulation pipeline, 80 product water pump, 90 throttling element, 100 product water tank, 110 buffer chamber, 120 annular baffle.

[0033] 130 Water inlet assembly, 131 Water inlet nozzle, 132 Water inlet main pipe, 133 Raw water pump, 134 Raw water tank;

[0034] 140mm annular overflow trough; 150mm flow guide channel;

[0035] 160 Dosing assembly, 161 Ring-shaped dosing manifold, 162 Dosing branch pipe, 163 Dosing pump;

[0036] 170 discharge pipe; 180 dehydration device;

[0037] 190 feeding pipe, 190a inlet, 190b outlet;

[0038] A. Jet nozzle, B. Annular slit, C. Water nozzle, D. Pesticide nozzle. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] refer to Figures 1-3 The chemical crystallization forced circulation granulation fluidized bed water treatment device (hereinafter referred to as the water treatment device) provided in this application includes at least an outer cylinder 10, an inner cylinder 20, an annular cavity 30, a jet port A, a spray port D, a water inlet assembly 130, a dosing assembly 160, and a seed crystal dispensing assembly (190 in the figure).

[0041] The water inlet assembly 130 is used to introduce the raw water to be treated.

[0042] The dosing assembly 160 is used to introduce a chemical agent that reacts with calcium, magnesium, and other substances in the raw water to soften it. The agent is sprayed out through the spray nozzle D. Specifically, the spray nozzle D is arranged adjacent to the jet port A and is connected to the bottom region of the annular cavity 30. The spray nozzle D is inclined so that the chemical agent is sprayed obliquely inward and downward towards the bottom opening of the annular cavity 30.

[0043] The seed delivery component is used to introduce seed crystals to accelerate the softening reaction.

[0044] An annular cavity 30 is formed between the inner cylinder 20 and the outer cylinder 10, with both the top and bottom ends of the annular cavity 30 being open.

[0045] The jet port A is connected to the bottom region of the annular cavity 30. The jet port A is set at an angle so that water is sprayed obliquely inward and downward to the bottom opening of the annular cavity 30.

[0046] By connecting the jet outlet A to the bottom region of the annular cavity 30 and setting the jet outlet A at an angle, a low-pressure region is formed at the bottom of the annular cavity 30, forcing the liquid phase in the annular cavity 30 to descend. This forces a circulation path of "liquid phase rising in the inner cylinder 20 and liquid phase descending in the annular cavity 30" (see...). Figure 4Furthermore, it can promote the seed crystal particles in the annular cavity 30 to fall from the bottom opening of the annular cavity 30, avoiding the "choking" failure; moreover, the jet can also compensate for the upward flow velocity of the inner cylinder 20, so that the inner cylinder 20 maintains a high fluidization efficiency; moreover, since the raw water to be treated flows upward, the water sprayed from the jet port A can form a counter-current mixing effect with the raw water, which is conducive to the uniform mixing of the seed crystal particles and the raw water.

[0047] By arranging the spray nozzle D adjacent to the jet outlet A and connecting the spray nozzle D to the bottom area of ​​the annular cavity 30, and by setting the spray nozzle D at an angle, this design can fully utilize the jet effect of the jet water to achieve a strong mixing effect between the agent and the raw water. It also allows the most intense initial softening reaction to occur in the air (i.e., at the intersection of the bottom end of the inner cylinder 20 and the top end of the bottom cylinder 40 in the figure), reducing the probability of scaling on the bottom wall of the cylinder and improving the operational safety and stability of the device. Furthermore, the spray nozzle D is surrounded by treated soft water descending from the annular cavity 30, so the spray nozzle D is less likely to be blocked by scaling due to the softening reaction.

[0048] In one embodiment, reference Figure 1 The water treatment device further includes a bottom cylinder 40. The bottom cylinder 40 is located in the bottom region of the outer cylinder 10 and on the bottom side of the inner cylinder 20. The inner diameter of the side wall of the bottom cylinder 40 is smaller than the inner diameter of the side wall of the inner cylinder 20. The top of the bottom cylinder 40 is open, and the bottom is closed. Specifically, the bottom of the bottom cylinder 40 can be connected to the bottom wall of the outer cylinder 10, so that the bottom of the bottom cylinder 40 is closed by the bottom wall of the outer cylinder 10. The bottom wall of the outer cylinder 10 can be flat to save construction costs.

[0049] Since the inner diameter of the side wall of the bottom cylinder 40 is smaller than that of the inner cylinder 20, the upward flow velocity between the two can form a clear boundary. Therefore, the bottom cylinder 40 can effectively screen large and small seed particles, thereby avoiding the problem of low seed utilization and high consumption caused by small seed particles being discharged with large seed particles.

[0050] In addition, when the bottom cylinder 40 is set, as the reaction proceeds, some particles will fall into the bottom cylinder 40 after reaching the controlled size because they are too large to be fluidized. The bottom cylinder 40 is then collected and stored. Therefore, the bottom cylinder 40 also serves to collect large seed particles. Because the flow velocity inside the bottom cylinder 40 is high, the particles that fall into the bottom cylinder 40 can still remain fluidized, thus making them less prone to caking.

[0051] Once the particles in the bottom cylinder 40 reach a certain quantity, they can be periodically discharged through the discharge pipe 170. The discharged particles can be dehydrated by the dewatering device 180 and then transported off-site. The dehydrated water can be recycled back into the original water tank 134.

[0052] In one embodiment, reference Figure 2The top of the sidewall of the bottom cylinder 40 is connected to the sidewall of the outer cylinder 10 via an annular conical plate 50. An annular gap B is formed between the annular conical plate 50 and the bottom of the sidewall of the inner cylinder 20, through which the water jet passes. The annular conical plate 50 has an annular stepped surface 50a, the top of which is inclined inward relative to the bottom. Jet ports A are located on the annular stepped surface 50a. Specifically, multiple jet ports A are sequentially spaced along the circumference of the annular stepped surface 50a (see...). Figure 3 ).

[0053] This design allows water ejected from jet port A to flow obliquely downwards and inwards through the annular slit B under the guidance of the annular conical plate 50, creating a strong counter-current mixing effect with the high-speed upward flow. This significantly improves the uniformity of mixing between the reagent and seed crystal particles and the raw water. Furthermore, positioning jet port A on the annular stepped surface 50a of the annular conical plate 50 ensures a simple jet structure, low manufacturing cost, and ease of assembly.

[0054] In one embodiment, see Figure 1 The water treatment device includes a jet water chamber 60, a circulation pipeline 70, and a product water pump 80. The jet water chamber 60 is connected to the jet port A and is located inside the outer cylinder 10, formed by the side wall of the outer cylinder 10 and an annular conical plate 50. The circulation pipeline 70 is used to introduce a portion of the product water from the water treatment device into the jet water chamber 60. The product water pump 80 is connected to the circulation pipeline 70, and the pumping pressure of the product water pump 80 pushes the water in the jet water chamber 60 to be ejected through the jet port A.

[0055] This design integrates the jet water chamber 60 with the cylinder body, eliminating the need for additional components to supply the jet water, resulting in a compact water treatment device with a small footprint and low construction costs.

[0056] In one embodiment, see Figure 1 The water treatment device is equipped with a throttling element 90. The inlet of the throttling element 90 is connected to the circulation pipeline 70, and the outlet serves as the product water outlet of the water treatment device. The water discharged from the product water outlet can be stored in the product water tank 100. Specifically, the throttling element 90 can be an easily adjustable back pressure valve or any component with a throttling function, such as a damping orifice plate. By setting up the throttling element 90, the product water can be distributed by adjusting the throttling element 90, so that a portion of the product water enters the product water tank 100 under the action of the product water pump 80, and a portion of the product water flows back to the jet water chamber 60 under the action of the product water pump 80. Only one product water pump 80 is needed to achieve two-way pumping.

[0057] In one embodiment, see Figure 1 The water treatment device is equipped with a buffer chamber 110 to buffer the produced water. The aforementioned circulation pipeline 70 connects the jet water chamber 60 and the buffer chamber 110. This design can meet the buffering requirement of using part of the produced water as jet water return.

[0058] In one embodiment, see Figure 1 The buffer chamber 110 is located inside the outer cylinder 10. An annular baffle 120 separates the jet water chamber 60 from the buffer chamber 110. The cylinder wall of the outer cylinder 10, the side wall of the bottom cylinder 40, and the annular baffle 120 together enclose and form the buffer chamber 110. At the same time, the annular baffle 120 also helps to enclose and form the jet water chamber 60. With this design, both the buffer chamber 110 and the jet water chamber 60 are highly integrated with the cylinder body, making the water treatment device compact, with a small footprint, and low construction cost.

[0059] In one embodiment, see Figure 3 The water inlet assembly 130 includes multiple water inlet nozzles 131, which are located in the bottom region of the outer cylinder 10. When a bottom cylinder 40 is provided, the water inlet nozzles 131 are further located in the bottom region of the bottom cylinder 40. The multiple water inlet nozzles 131 are evenly distributed. The top of the water inlet nozzle 131 is connected to the main water inlet pipe 132, which is connected to the raw water tank 134. A raw water pump 133 is connected to the main water inlet pipe 132. The bottom end of the water inlet nozzle 131 is provided with a spray nozzle C, which allows the raw water to be sprayed downwards through the bottom spray nozzle C. After being sprayed out, the raw water first collides with the bottom wall of the bottom cylinder 40 or the bottom wall of the outer cylinder 10, and then bounces upwards (see...). Figure 4 This design effectively disturbs particles deposited on the bottom wall of the cylinder. Moreover, since the water inlet assembly 130 is a simple pipe structure without any interlayer or other structures that could easily create dead zones, there are fewer disturbance dead zones in the bottom area of ​​the cylinder, making it less prone to particle caking, and the manufacturing cost is low.

[0060] In one embodiment, see Figure 1 The water treatment device is equipped with an annular overflow trough 140, which is located in the top region of the outer cylinder 10, thus making the annular overflow trough 140 internal. This internal design makes the water treatment device more compact and facilitates communication with the buffer chamber 110 inside the outer cylinder 10. Specifically, the annular overflow trough 140 and the buffer chamber 110 can be connected through an internal guide channel 150, and the aforementioned annular partition 120 and annular conical plate 50 are provided with through holes for the guide channel 150 to pass through.

[0061] In one embodiment, see Figures 1-3The dosing assembly 160 includes an annular dosing manifold 161 surrounding the outer cylinder 10 and multiple dosing branch pipes 162 arranged sequentially at intervals along the circumference. The annular dosing manifold 161 is connected to the dosing pump 163. The annular dosing manifold 161 is externally mounted for easy assembly. The outer ends of the dosing branch pipes 162 are connected to the annular dosing manifold 161, and the spray nozzle D is located at the inner end of the dosing branch pipe 162. Multiple through holes are formed on the annular stepped surface 50a of the annular conical plate 50, avoiding the jet port A. The dosing branch pipes 162 pass through the through holes. If necessary, the inner end of the dosing branch pipe 162 can extend to the inside of the annular stepped surface 50a, so that the spray nozzle D is located inside the annular stepped surface 50a.

[0062] In one embodiment, see Figure 1 The seed crystal feeding assembly includes a feeding pipe 190, with an inlet 190a at the top and an outlet 190b at the bottom. The inlet 190a is located above the overflow port of the outer cylinder 10, and the outlet 190b is located below the overflow port of the outer cylinder 10 and above the overflow port of the inner cylinder 20. This design allows for direct top-down feeding of dry seed crystals without the need for pumping or stirring devices, thus saving on construction and operation / maintenance costs. Furthermore, because the outlet 190b is located below the overflow port of the outer cylinder 10, the fed seed crystals will not enter the annular overflow tank 140 with the overflow liquid surface of the outer cylinder 10. Moreover, because the outlet 190b is located above the overflow port of the inner cylinder 20, the seed crystals can be evenly dispersed into the annular cavity 30 with the spring-like overflow of the inner cylinder 20 (see...). Figure 5 This allows for uniform feeding of seed crystals.

[0063] In summary, this application has the advantages of being able to force the formation of circulation, having high softening efficiency, being less prone to "choking" failures, being less prone to scaling and clogging of the spray nozzle, having high seed utilization rate, low seed consumption, being less prone to particle caking, being compact, having a small footprint, having low construction and manufacturing costs, and having low operation and maintenance costs.

[0064] The following is a specific application example of this application:

[0065] The water production capacity of this application example is 50m³. 3The initial fluidization velocity is 60 m / h for small seed crystals with a diameter d = 0.5 mm and an outflow velocity of 100 m / h. After softening, the larger seed crystals have an upper limit of 3 mm for discharge, an initial fluidization velocity of 90 m / h and an outflow velocity of 130 m / h. Five inlet spray pipes with a diameter of DN25 are installed, and the spray velocity can reach 5.5 m / s. The bottom chamber has an inner diameter of 780 mm and a height of 800 mm, and the upward flow velocity inside the bottom chamber can reach 104 m / h, thus meeting the requirements for screening large and small particles, rectifying the flow, and accommodating the storage volume of coarse particles. The annular conical plate has a taper of 45°. 72 Φ5 jet nozzles are opened on the annular conical plate, with a nozzle spacing of approximately 49 mm, so that the jet can cover the entire annular gap between the inner cylinder and the annular conical plate, and the jet velocity at the nozzles can reach 5 m / s. The height of the annular gap between the inner cylinder and the annular conical plate is 50 mm. The product water and return jet water flow at a distance of 50 m... 3 / h, 25m 3 / h allocation. The buffer chamber volume is 1.2m³. 3 The annular overflow trough and buffer chamber are connected by four DN80 guide channels. The annular dosing manifold uses a DN65 pipe diameter, with 12 evenly distributed dosing branch pipes, each using a DN8 pipe diameter. The inner cylinder has an inner diameter of 980mm and a height of 2500mm, while the outer cylinder has an inner diameter of 1600mm and a height of 1400mm. After the jetting of water, the upward flow velocity in the inner cylinder can reach over 90m / h, which satisfies the fluidization conditions for most particles and ensures the bed height, allowing sufficient contact and reaction time for the reagent, raw water, and seed crystal particles. The upward flow velocity at the top of the inner cylinder is below 30m / h, far below the critical fluidization velocity, so particles will not rise with the water flow in this area and will not be carried into the annular overflow trough. The overflow trough is 250mm wide and 200mm deep, and the inner diameter of the overflow port of the outer cylinder is 1100mm, with an upward flow velocity of 78m / h at the overflow port.

[0066] The above examples illustrate the principles and implementation methods of this application. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A chemical crystallization forced circulation granulation fluidized bed water treatment device, the water treatment device comprising an outer cylinder (10), an inner cylinder (20), and an annular cavity (30) open at both ends, the annular cavity (30) being formed between the sidewall of the inner cylinder (20) and the sidewall of the outer cylinder (10), characterized in that, The water treatment device includes a jet nozzle (A) that communicates with the bottom region of the annular cavity (30). The jet nozzle (A) is inclined so that water is sprayed obliquely inward and downward toward the bottom opening of the annular cavity (30). The jet nozzle (A) sprays the product water of the water treatment device. The device also includes a water inlet assembly (130) for introducing raw water to be treated. The raw water to be treated can flow upward through the inner cylinder (20). The water treatment device includes a spray nozzle (D) that is arranged adjacent to the jet nozzle (A) and communicates with the bottom region of the annular cavity (30). The water treatment device includes a jet water chamber (60) and a circulation pipeline (70); the jet water chamber (60) is connected to the jet port (A) and is located inside the outer cylinder (10); the circulation pipeline (70) is used to introduce part of the produced water of the water treatment device into the jet water chamber (60). The water treatment device includes a buffer chamber (110) and an annular partition (120). The buffer chamber (110) is located inside the outer cylinder (10). The annular partition (120) separates the jet water chamber (60) and the buffer chamber (110). The circulation pipeline (70) connects the jet water chamber (60) and the buffer chamber (110).

2. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to claim 1, characterized in that, The water treatment device includes a bottom cylinder (40), which is located in the bottom area of ​​the outer cylinder (10) and on the bottom side of the inner cylinder (20). The inner diameter of the side wall of the bottom cylinder (40) is smaller than the inner diameter of the side wall of the inner cylinder (20).

3. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to claim 2, characterized in that, The water treatment device includes an annular conical plate (50). The top of the side wall of the bottom cylinder (40) is connected to the side wall of the outer cylinder (10) through the annular conical plate (50). An annular gap (B) for jet flow is formed between the annular conical plate (50) and the bottom of the side wall of the inner cylinder (20). The annular conical plate (50) is provided with an annular stepped surface (50a). The top of the annular stepped surface (50a) is inclined inward relative to the bottom. The jet port (A) is provided on the annular stepped surface (50a).

4. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to claim 3, characterized in that, The water treatment device includes a water production pump (80); the jet water chamber (60) is formed by the side wall of the outer cylinder (10) and the annular conical plate (50); the water production pump (80) is connected to the circulation pipeline (70).

5. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to claim 1, characterized in that, The water treatment device includes a throttling element (90), the inlet of which is connected to the circulation pipeline (70), and the outlet of which serves as the product water outlet of the water treatment device.

6. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to claim 2, characterized in that, The outer cylinder (10) wall, the bottom cylinder (40) sidewall and the annular partition (120) together form the buffer cavity (110).

7. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to any one of claims 1-6, characterized in that, The water treatment device includes a water inlet assembly (130), which includes a water inlet nozzle (131). The water inlet nozzle (131) is located in the bottom area of ​​the outer cylinder (10), and the bottom end of the water inlet nozzle (131) is provided with a water spray port (C).

8. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to any one of claims 1-6, characterized in that, The water treatment device includes an annular overflow trough (140) located in the top region of the outer cylinder (10).

9. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to any one of claims 3-6, characterized in that, The water treatment device includes a dosing assembly (160), which includes an annular dosing manifold (161) surrounding the outer cylinder (10) and multiple dosing branch pipes (162) arranged sequentially at intervals along the circumference. The outer end of the dosing branch pipe (162) is connected to the annular dosing manifold (161). The dosing branch pipe (162) passes through a through hole on the annular stepped surface (50a). The inner end of the dosing branch pipe (162) is provided with a spray nozzle (D). The spray nozzle (D) is inclined so as to spray the agent obliquely inward and downward to the bottom opening of the annular cavity (30).

10. The chemical crystallization forced circulation granulation fluidized bed water treatment device according to any one of claims 1-6, characterized in that, The water treatment device includes a seed crystal feeding assembly, which includes a feeding pipe (190). The feeding pipe (190) has an inlet (190a) at its top end and an outlet (190b) at its bottom end. The inlet (190a) is located above the overflow port of the outer cylinder (10), and the outlet (190b) is located below the overflow port of the outer cylinder (10) and above the overflow port of the inner cylinder (20).

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