Fluidized bed granulation system

Abstract

The utility model relates to the technical field of granule processing, in particular to a fluidized bed granulation system. The fluidized bed granulation system comprises a fluidized bed granulation device, a screening device, a crushing device, a first dust falling device and a second dust falling device; an outlet pipeline of the fluidized bed granulation device is connected with an inlet of the screening device, an outlet pipeline of the screening device is connected with a feeding port of the crushing device, an outlet pipeline of the crushing device is in bypass connection with at least one group of first dust falling devices, and the second dust falling device is connected with the fluidized bed granulation device. After dust removal treatment of the first dust removal device, if a small amount of residual dust still exists in the pipeline, the residual dust can be treated through the second dust removal device, the second dust removal device comprises the second dust treatment assembly and the induced draft fan, the residual dust can be effectively treated, the high dust removal efficiency is achieved, and the good dust removal effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of granulation technology, and in particular to a fluidized bed granulation system. Background Technology

[0002] There are various common methods and equipment for granulation production, among which fluidized bed granulation is a commonly used method. Fluidized bed granulation produces high-strength granules, but it requires a crusher to break up large-diameter granules that exceed product requirements into smaller-diameter granules, which are then returned to the granulator inlet as seed crystals for granulation. When the crusher breaks up large-diameter granules, it generates dust and small particles that enter the granulator, increasing the amount of dust in the granulator. Due to the large air volume inside the granulator, dust handling is difficult, ultimately increasing the overall dust emission of the granulation system. A large amount of dust is emitted into the air, which can pollute the air and harm the health of workers, and in severe cases, may pose a risk of dust explosion.

[0003] To address the issue of excessive dust emissions from fluidized bed granulation systems, existing technologies only install dust removal devices on the granulator. While this can handle some of the dust, the excessive dust generated by the crusher means that some residual dust remains untreated when transported to the granulator via pipelines. This results in a significant reduction in dust removal efficiency and a problem that urgently needs to be solved. Utility Model Content

[0004] This invention provides a fluidized bed granulation system to solve the technical problems of low dust removal efficiency and poor effect in the granulation process of existing fluidized bed granulation systems.

[0005] This utility model provides a fluidized bed granulation system, including: a fluidized bed granulation device, a screening device, a crushing device, a first dust suppression device, and a second dust suppression device; the outlet pipe of the fluidized bed granulation device is connected to the inlet of the screening device, the outlet pipe of the screening device is connected to the feed port of the crushing device, the outlet pipe of the crushing device is connected to at least one set of the first dust suppression device, and the second dust suppression device is connected to the fluidized bed granulation device.

[0006] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the first dust suppression device includes a fan inlet pipe, a vacuum fan, a fan outlet pipe, and a first dust treatment component; the inlet end of the fan inlet pipe is connected to the outlet pipe of the crushing device, and the fan inlet pipe, the vacuum fan, the fan outlet pipe, and the first dust treatment component are connected in sequence to form the dust treatment passage of the crushing device.

[0007] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the first dust treatment component includes a dust collection unit, the dust collection unit includes a dust collection inlet, a first exhaust pipe and a dust discharge pipe; the first exhaust pipe discharges dust-free air into the atmosphere, and the dust discharge pipe is connected to a dust dissolution unit.

[0008] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the dust dissolution unit includes a dissolution tank, the dissolution tank is connected to the discharge port of the dust discharge pipeline, and a solution for dissolving dust is provided in the dissolution tank.

[0009] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the dust dissolving unit further includes a motor, a stirring shaft, and stirring blades; the shaft end of the motor is connected to the stirring shaft, the lower end of the stirring shaft is provided with the stirring blades, and the stirring blades are disposed in the solution.

[0010] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the first dust treatment component includes a dust washing unit, the dust washing unit includes a first dust washing inlet, a second dust washing inlet, a second exhaust pipe and a drain pipe; the first dust washing inlet is used to input washing liquid, the second dust washing inlet is used to input dust-laden gas, the second exhaust pipe is used to discharge dust-free air into the atmosphere, and the drain pipe is used to discharge the washing liquid containing dissolved dust.

[0011] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the outlet pipeline of the screening device includes a first screening pipeline, a second screening pipeline, and a third screening pipeline;

[0012] The inlet of the first screening pipeline is connected to the screening device, and the outlet is connected to the product cooling device, which is used to transport the first granules to the product warehouse.

[0013] The feed inlet of the second screening pipeline is connected to the screening device, and the discharge outlet is connected to the crushing device, for conveying the second particle to the crushing device for crushing;

[0014] The feed inlet of the third screening pipeline is connected to the screening device, and the discharge outlet is connected to the fluidized bed granulation device, which is used to transport the third granules to the fluidized bed granulation device as seed crystals.

[0015] One end of the outlet pipe of the crushing device is connected to the crushing device, and the other end is connected to the fluidized bed granulation device;

[0016] Among them, the first particle is qualified, while the second and third particles are unqualified. The diameter of the second particle is larger than that of the third particle.

[0017] A fluidized bed granulation system according to an embodiment of the present invention further includes a bucket elevator, which is disposed between the third screening pipeline and the fluidized bed granulation device, or the bucket elevator is disposed between the outlet pipeline of the crushing device and the fluidized bed granulation device.

[0018] According to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the second dust removal device includes a second dust treatment component and an induced draft fan; the fluidized bed granulation device, the second dust treatment component and the induced draft fan are connected in sequence to form a dust treatment passage inside the fluidized bed granulation device.

[0019] A fluidized bed granulation system according to an embodiment of the present invention further includes a filter screen, which is disposed at the inlet end of the blower inlet pipe to prevent crushed granules from being sucked into the vacuum blower.

[0020] The fluidized bed granulation system provided by this utility model utilizes a first dust suppression device connected to the outlet pipe of the crushing device and a second dust suppression device installed within the fluidized bed granulation device. These two devices work together to achieve overall dust suppression for the system. The first dust suppression device includes a fan inlet pipe, a vacuum fan, a fan outlet pipe, and a first dust treatment component. The fan inlet pipe, vacuum fan, fan outlet pipe, and first dust treatment component are sequentially connected to form the dust treatment path of the crushing device. The first dust treatment component can be selected from a dust collection unit and a dust dissolving unit. Dust treatment can be carried out using either a dust removal unit or a dust washing unit. Both methods can effectively treat dust-laden gas and significantly reduce the dust content of the exhaust gas. After the dust removal process of the first dust removal device, if a small amount of residual dust still exists in the pipeline, it is treated together with the dust generated during granulation by a second dust removal device. The second dust removal device includes a second dust treatment component and an induced draft fan, which can effectively treat residual dust, has a high dust removal efficiency, can reduce the dust emission of the fluidized bed granulation system, and bring about a good dust removal effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a production flow diagram of the fluidized bed granulation system provided by this utility model.

[0023] Figure 2 This is a structural diagram of the first dust suppression device provided by this utility model.

[0024] Figure 3 This is a structural diagram of the dust collection unit and dust dissolving unit provided by this utility model.

[0025] Figure 4 This is a structural diagram of the dust washing unit provided by this utility model.

[0026] Figure 5 This is a structural diagram of the second dust suppression device provided by this utility model.

[0027] Figure label:

[0028] 1. Fluidized bed granulation device;

[0029] 2. Screening device; 21. First screening pipeline; 22. Second screening pipeline; 23. Third screening pipeline;

[0030] 3. Crushing device;

[0031] 4. First dust suppression device; 41. Fan inlet pipe; 42. Vacuum fan; 43. Fan outlet pipe; 44. First dust treatment assembly;

[0032] 441. Dust collection unit; 4411. Dust collection inlet; 4412. First exhaust pipe; 4413. Dust discharge pipe;

[0033] 442. Dust dissolving unit; 4421. Dissolving tank; 4422. Solution; 4423. Motor; 4424. Stirring shaft; 4425. Stirring blades;

[0034] 443. Dust washing unit; 4431. First dust washing inlet; 4432. Second dust washing inlet; 4433. Second exhaust pipe; 4434. Drain pipe; 45. Filter screen;

[0035] 5. Second dust suppression device; 51. Second dust treatment assembly; 52. Exhaust fan;

[0036] 6. Product cooling device; 7. Bucket elevator device. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] The following is combined Figures 1-5 This invention describes a fluidized bed granulation system according to an embodiment of the present invention.

[0039] Figure 1 This is a production flow diagram of the fluidized bed granulation system provided by this utility model, such as... Figure 1 As shown in the figure, the fluidized bed granulation system provided by this utility model includes: a fluidized bed granulation device 1, a screening device 2, a crushing device 3, a first dust suppression device 4, and a second dust suppression device 5; the outlet pipe of the fluidized bed granulation device 1 is connected to the inlet of the screening device 2, which is used to screen the granules output from the fluidized bed granulation device 1 by particle size, outputting qualified granules to the product warehouse, and reprocessing unqualified granules; wherein, the granules can be fertilizer granules, such as urea granules, ammonium nitrate granules, calcium ammonium nitrate granules, ammonium carbonate granules, compound fertilizer granules, etc.; the outlet pipe of the screening device 2 is connected to the feed port of the crushing device 3, and at least one set of first dust suppression devices 4 is connected to the outlet pipe of the crushing device 3, and the second dust suppression device 5 is connected to the fluidized bed granulation device 1; the first dust suppression device 4 and the second dust suppression device 5 are combined to jointly perform dust suppression treatment on the system, achieving complementary dust suppression effects and realizing better dust suppression results;

[0040] In one embodiment of this utility model, a filter screen 45 is also included. The filter screen 45 is disposed at the inlet end of the blower inlet pipe 41 to prevent the crushed granules from being sucked into the vacuum blower 42 and causing damage to the vacuum blower 42.

[0041] In one embodiment of this utility model, the outlet pipeline of the screening device 2 includes a first screening pipeline 21, a second screening pipeline 22, and a third screening pipeline 23; the inlet of the first screening pipeline 21 is connected to the screening device 2, and the outlet is connected to the product cooling device 6, for conveying the first granules to the product warehouse; the inlet of the second screening pipeline 22 is connected to the screening device 2, and the outlet is connected to the crushing device 3, for conveying the second granules to the crushing device 3 for crushing; the inlet of the third screening pipeline 23 is connected to the screening device 2, and the outlet is connected to the fluidized bed granulation device 1, for conveying the third granules to the fluidized bed granulation device 1 as seed crystals; one end of the outlet pipeline of the crushing device 3 is connected to the crushing device 3, and the other end is connected to the fluidized bed granulation device 1; wherein, the first granules are qualified granules, the second granules and the third granules are unqualified granules, the diameter of the second granules is larger than the diameter of the third granules, and the difference between the diameter of the second granules and the diameter of the third granules becomes smaller after crushing. The aforementioned pipelines and devices form a circulating loop for fluidized granulation.

[0042] In one embodiment of this utility model, a bucket elevator 7 is also included. The bucket elevator 7 can be set between the third screening pipeline 23 and the fluidized bed granulation device 1, or between the outlet pipeline of the crushing device 3 and the fluidized bed granulation device 1, depending on actual needs. The discharge port of the outlet pipeline of the crushing device 3 can be directly connected to the bucket elevator 7, or it can be connected to the third screening pipeline 23. When the outlet pipeline of the crushing device 3 is connected to the third screening pipeline 23, the crushed second and third particles will be transported together to the bucket elevator 7, and then transported to the fluidized bed granulation device 1 as seed crystals.

[0043] Figure 2 This is a structural diagram of the first dust suppression device 4 provided by this utility model, as shown below. Figure 2 As shown, according to an embodiment of the present invention, a fluidized bed granulation system includes a first dust suppression device 4 comprising a fan inlet pipe 41, a vacuum fan 42, a fan outlet pipe 43, and a first dust treatment component 44. The inlet end of the fan inlet pipe 41 is connected to the outlet pipe of the crushing device 3. The fan inlet pipe 41, the vacuum fan 42, the fan outlet pipe 43, and the first dust treatment component 44 are sequentially connected to form a dust treatment passage for the crushing device 3. The vacuum fan 42 is a micro-vacuum fan, which can be a centrifugal vacuum fan or a reciprocating fan. The dust generated by the crushing device 3 from crushing the granules will fall to the outlet pipe of the crushing device 3. Since the fan inlet pipe 41 is connected to the outlet pipe of the crushing device 3, the falling dust can be sucked into the first dust suppression device 4 for treatment in a timely manner.

[0044] Furthermore, in another embodiment provided by this utility model, the first dust suppression device 4 can be set in multiple sets on the outlet pipe of the crushing device 3 according to actual usage requirements, so as to reduce the amount of dust residue in the pipe and improve the dust treatment efficiency.

[0045] Figure 3 This is a structural diagram of the dust collection unit 441 and the dust dissolving unit 442 provided by this utility model, as shown below. Figure 3 As shown, according to an embodiment of the present invention, a fluidized bed granulation system includes a first dust treatment component 44, which includes a dust collection unit 441. The dust collection unit 441 includes a dust collection inlet 4411, a first exhaust pipe 4412, and a dust discharge pipe 4413. The first exhaust pipe 4412 discharges clean air into the atmosphere, and the dust discharge pipe 4413 is connected to a dust dissolution unit 442. The dust collection unit 441 can collect dust-laden gas and separate the dust and clean air in the dust-laden gas, and discharge them through the two pipes respectively. The dust discharged from the dust discharge pipe 4413 can be further processed.

[0046] Furthermore, in a specific embodiment provided by this utility model, the dust collection unit 441 includes a body and a cone with its tip pointing downwards, which is disposed at the end of the body. The dust collection inlet 4411 is disposed on the side wall of the body, the first exhaust pipe 4412 is disposed at the end of the body away from the cone, and the dust discharge pipe 4413 is disposed at the tip of the cone.

[0047] like Figure 3 As shown, a fluidized bed granulation system according to an embodiment of the present invention includes a dust dissolution unit 442 comprising a dissolution tank 4421 connected to the outlet of a dust discharge pipe 4413, wherein a solution 4422 for dissolving dust is provided in the dissolution tank 4421; the dissolution tank 4421 may be specially designed or may be an existing one in the production equipment; the dust dissolution unit 442 also includes a motor 4423, a stirring shaft 4424, and stirring blades 4425; the shaft end of the motor 4423 is connected to the stirring shaft 4424, and stirring blades 4425 are provided at the lower end of the stirring shaft 4424, wherein the stirring blades 4425 are disposed in the solution 4422, wherein the stirring blades 4425 are preferably located below the liquid surface of the solution 4422, so as to maximize the effect of stirring to accelerate dust dissolution; according to actual usage requirements, a motor 4423 with appropriate power and the size, shape, and number of stirring blades 4425 are selected.

[0048] Figure 4 This is a structural diagram of the dust washing unit 443 provided by this utility model, as shown below. Figure 4 As shown, a fluidized bed granulation system according to an embodiment of the present invention includes a first dust treatment component 44 comprising a dust washing unit 443. The dust washing unit 443 includes a first dust washing inlet 4431, a second dust washing inlet 4432, a second exhaust pipe 4433, and a drain pipe 4434. The first dust washing inlet 4431 is used to input washing liquid, the second dust washing inlet 4432 is used to input dust-laden gas, the second exhaust pipe 4433 is used to discharge dust-free air into the atmosphere, and the drain pipe 4434 is used to discharge the washing liquid containing dissolved dust. The washing liquid can be returned to the production system and reused as raw material.

[0049] Furthermore, in a specific embodiment of this utility model, the dust washing unit 443 includes a main body and conical bodies disposed at both ends of the main body. The first dust washing inlet 4431 and the second dust washing inlet 4432 are both disposed on the side wall of the main body. The second exhaust pipe 4433 and the drain pipe are respectively disposed at the ends of the conical bodies. The main body contains components for washing dust-laden gas, which can dissolve the dust in the dust-laden gas into the washing liquid and discharge it through the drain pipe. Dust-free gas is discharged from the second exhaust pipe 4433.

[0050] Figure 5This is a structural diagram of the second dust suppression device 5 provided by this utility model, as shown below. Figure 5 As shown, according to an embodiment of the present invention, a fluidized bed granulation system is provided, wherein the second dust removal device 5 includes a second dust treatment component 51 and an induced draft fan 52; the fluidized bed granulation device 1, the second dust treatment component 51 and the induced draft fan 52 are connected in sequence to form a dust treatment passage inside the fluidized bed granulation device 1.

[0051] In one specific embodiment of the present invention, the second dust treatment component 51 may use a dust washing unit 443 or a combination of a dust collection unit 441 and a dust dissolving unit 442 to perform dust treatment.

[0052] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fluid bed granulation system characterized by, The application relates to a fluidized bed granulation device (1), a screening device (2), a crushing device (3), a first dust falling device (4) and a second dust falling device (5). An outlet pipeline of the fluidized bed granulation device (1) is connected with an inlet of the screening device (2), an outlet pipeline of the screening device (2) is connected with a feeding opening of the crushing device (3), at least one group of the first dust falling device (4) is connected with the outlet pipeline of the crushing device (3), and the second dust falling device (5) is connected with the fluidized bed granulation device (1). The first dust falling device (4) comprises a fan inlet pipeline (41), a vacuum fan (42), a fan outlet pipeline (43) and a first dust treatment component (44); an inlet end of the fan inlet pipeline (41) is connected with the outlet pipeline of the crushing device (3), the fan inlet pipeline (41), the vacuum fan (42), the fan outlet pipeline (43) and the first dust treatment component (44) are sequentially connected to form a dust treatment channel of the crushing device (3).

2. The fluid bed granulation system of claim 1, wherein, The first dust treatment component (44) comprises a dust collection unit (441), the dust collection unit (441) comprises a dust collection inlet (4411), a first exhaust pipeline (4412) and a dust exhaust pipeline (4413); the first exhaust pipeline (4412) is used for exhausting dust-free air into the atmosphere, and the dust exhaust pipeline (4413) is connected with a dust dissolving unit (442).

3. The fluid bed granulation system of claim 2, wherein, The dust dissolving unit (442) comprises a dissolving tank (4421), the dissolving tank (4421) is connected with a discharging opening of the dust exhaust pipeline (4413), and a solution (4422) for dissolving dust is arranged in the dissolving tank (4421).

4. The fluid bed granulation system of claim 3, wherein, The dust dissolving unit (442) further comprises a motor (4423), a stirring shaft (4424) and stirring blades (4425); a shaft end of the motor (4423) is connected with the stirring shaft (4424), a lower end of the stirring shaft (4424) is provided with the stirring blades (4425), and the stirring blades (4425) are arranged in the solution (4422).

5. The fluid bed granulation system of claim 4, wherein, The first dust treatment component (44) comprises a dust washing unit (443), the dust washing unit (443) comprises a first dust washing inlet (4431), a second dust washing inlet (4432), a second exhaust pipeline (4433) and a liquid exhaust pipeline (4434); 6. The fluid bed granulation system of claim 2, wherein, The first dust washing inlet (4431) is used for inputting washing liquid, the second dust washing inlet (4432) is used for inputting dust-containing gas, the second exhaust pipeline (4433) is used for exhausting dust-free air into the atmosphere, and the liquid exhaust pipeline (4434) is used for exhausting the washing liquid in which dust is dissolved. An outlet pipeline of the screening device (2) comprises a first screening pipeline (21), a second screening pipeline (22) and a third screening pipeline (23); 7. The fluid bed granulation system of claim 1, wherein, A feeding opening of the first screening pipeline (21) is connected with the screening device (2), a discharging opening is connected with a product cooling device (6), and the first screening pipeline (21) is used for conveying first granules to a product warehouse; ​ The feeding port of the second screening pipeline (22) is connected with the screening device (2), and the discharging port is connected with the crushing device (3), so as to convey the second granules to the crushing device (3) for crushing; The feeding port of the third screening pipeline (23) is connected with the screening device (2), and the discharging port is connected with the fluidized bed granulation device (1), so as to convey the third granules to the fluidized bed granulation device (1) as seeds; One end of the outlet pipeline of the crushing device (3) is connected with the crushing device (3), and the other end is connected with the fluidized bed granulation device (1). The first granules are qualified granules, the second and third granules are unqualified granules, and the diameter of the second granules is greater than that of the third granules.

8. The fluid bed granulation system of claim 7, wherein, The bucket lifting device (7) is arranged between the third screening pipeline (23) and the fluidized bed granulation device (1), or the bucket lifting device (7) is arranged between the outlet pipeline of the crushing device (3) and the fluidized bed granulation device (1).

9. The fluid bed granulation system of any one of claims 1-8, wherein, The second dust falling device (5) comprises a second dust treatment assembly (51) and an air draught fan (52); the fluidized bed granulation device (1), the second dust treatment assembly (51) and the air draught fan (52) are sequentially connected, so as to form a treatment channel for dust inside the fluidized bed granulation device (1).

10. The fluid bed granulation system of any one of claims 2-6, wherein, The filter screen (45) is arranged at the inlet end of the fan inlet pipeline (41), so as to prevent the crushed granules from being sucked into the vacuum fan (42).

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