High-purity malic acid granulation fluidized bed

Abstract

The invention relates to the technical field of fluidized beds, and particularly discloses a high-purity malic acid granulation fluidized bed which comprises a fluidized bed shell, an air processor and a granulation solution nozzle. A fluidization cavity is formed in the fluidized bed shell, and an air nozzle is arranged at the bottom of the fluidization cavity; the air treatment device comprises an air distribution disc and a temperature controller, the air distribution disc is arranged at the bottom of the fluidization cavity and located above the air nozzles, and the temperature controller communicates with the fluidization cavity; the granulation solution nozzle comprises a first solution limiting shell, a second solution limiting shell, a solution spraying rotating wheel and a cleaning device, the first solution limiting shell is provided with a first solution spraying opening, the second solution limiting shell is provided with a second solution spraying opening, and the solution spraying rotating wheel is arranged in the first solution limiting shell and the second solution limiting shell; the liquid spraying rotating wheel controls communication of the first solution nozzles and communication of the second solution nozzles, and the cleaning device is connected with the fluidized bed shell. The granulation solution nozzle has the effect of reducing the influence of the granulation solution nozzle on the granulation effect after the long-time working process.

Description

Technical Field

[0001] The present application relates to the technical field of fluidized beds, and in particular to a high-purity malic acid granulation fluidized bed. Background Art

[0002] Fluidized bed is an engineering equipment that uses gas or liquid to suspend solid particles, making the solid particles form a fluid-like state. In the actual production process, fluidized bed is widely used in chemical, petroleum, metallurgy, pharmaceutical, food processing and other fields.

[0003] When the fluidized bed is applied to the pharmaceutical technology field, it is mainly used for granulation or adding coating to material particles. During granulation, the material powder is placed in the fluidized bed, and the granulation solution is sprayed into the fluidized bed to combine the material powder in the fluidized bed to form material particles, and the air flowing in the fluidized bed evaporates the water inside the particles, so as to quickly obtain a large number of required material particles.

[0004] In the existing fluidized bed granulation process, the nozzle spraying the granulation solution is in contact with the material powder in the fluidized bed for a long time, so the material powder is easily accumulated at the nozzle, thereby affecting the spraying of the granulation solution and the granulation effect. Summary of the invention

[0005] In order to reduce the influence of the granulation solution nozzle on the granulation effect after a long working process, the present application provides a high-purity malic acid granulation fluidized bed.

[0006] This application provides a technical solution that adopts the following:

[0007] A high-purity malic acid granulation fluidized bed, comprising:

[0008] The fluidized bed shell has a fluidizing chamber formed inside, and an air nozzle is provided at the bottom of the fluidizing chamber;

[0009] An air treatment device, comprising an air distribution plate and a temperature controller, wherein the air distribution plate is arranged at the bottom of the fluidizing chamber and above the air nozzle, the air distribution plate is used to control the flow direction of the air sprayed from the air nozzle, and the temperature controller is connected to the fluidizing chamber and is used to control the air temperature in the fluidizing chamber;

[0010] A granulation solution nozzle comprises a first liquid-limiting shell, a second liquid-limiting shell, a liquid spraying wheel and a cleaning device, wherein the first liquid-limiting shell and the second liquid-limiting shell are both arranged above the air distribution plate, the first liquid-limiting shell is provided with a first solution nozzle, the second liquid-limiting shell is provided with a second solution nozzle, the liquid spraying wheel is arranged in the first liquid-limiting shell and the second liquid-limiting shell, the first liquid-limiting shell and the second liquid-limiting shell are both rotatably connected to the liquid spraying wheel, the liquid spraying wheel is used to transport the granulation solution and control the connection of the first solution nozzle and the connection of the second solution nozzle, the cleaning device is connected to the fluidized bed shell, and the cleaning device is used to clean the first solution nozzle and the second solution nozzle.

[0011] By adopting the above technical solution, during the operation of the fluidized bed, the air nozzle transports air into the fluidizing chamber, and the air flows through the air distributor to evenly blow up the material powder in the fluidizing chamber, and the granulating solution in the granulating solution nozzle is sprayed from the first solution nozzle into the fluidizing chamber, so that the material powder gathers to form material particles. After the first solution nozzle sprays for a set time, the second liquid-limiting shell rotates the second solution nozzle to the spraying position, the solution in the spray wheel stops spraying from the first solution nozzle, and the second solution nozzle starts to spray the solution, the first liquid-limiting shell rotates to rotate the first solution nozzle to the position of the cleaning device, the cleaning device removes the material powder and material particles attached to the vicinity of the first solution nozzle, and after the second solution nozzle works for a set time, the first liquid-limiting shell rotates to turn the first solution nozzle back to the spraying position, the second solution nozzle stops working, the first solution nozzle works, the second liquid-limiting shell rotates to rotate the second solution nozzle into the cleaning device, the second solution nozzle is cleaned, and a cycle of the first solution nozzle and the second solution nozzle spraying the granulation solution is formed, which ultimately reduces the influence of the granulation solution nozzle on the granulation effect after a long working process.

[0012] Optionally, a liquid spray hole is provided in the liquid spray wheel, and a control baffle is arranged in the liquid spray hole, and the control baffle is used to control the connection between the liquid spray hole and the first solution nozzle and the second solution nozzle.

[0013] By adopting the above technical solution, the control baffle can realize the first solution nozzle to spray granulation solution by controlling the spray hole to be connected with the first solution nozzle. When the control baffle controls the spray hole to be connected with the second solution nozzle, the granulation solution is sprayed from the second solution nozzle.

[0014] Optionally, the control baffle is connected to a rotating motor, and the rotating motor controls the control baffle to rotate and close the first solution nozzle or the second solution nozzle.

[0015] By adopting the above technical solution, the rotating motor controls the rotation of the control baffle, so that the control baffle switches between the state of covering the first solution nozzle and the state of covering the second solution nozzle, thereby realizing the control of the control baffle on the connection relationship between the spray hole, the first solution nozzle and the second solution nozzle.

[0016] Optionally, the cleaning device includes a dustproof shell, a cleaning brush and a debris recovery piece, the dustproof shell is provided with a cleaning cavity, the cleaning brush is arranged in the cleaning cavity, the cleaning brush is used to clean the first solution nozzle or the second solution nozzle, the debris recovery piece is arranged at the bottom of the cleaning cavity, and the debris recovery piece is used to recover debris cleaned out by the cleaning brush.

[0017] By adopting the above technical scheme, the dustproof shell blocks the cleaning chamber and the fluidizing chamber, reducing the material powder and material particles in the fluidizing chamber from entering the cleaning chamber to interfere with the cleaning of the first solution nozzle or the second solution nozzle in the cleaning device; the cleaning brush removes the material powder and material particles attached to the first solution nozzle or the second solution nozzle, and the debris recovery part collects the removed material powder and material particles, thereby completing the cleaning of the first solution nozzle or the second solution nozzle.

[0018] Optionally, the debris recovery component includes a recovery baffle and a recovery box, the dustproof shell is provided with a connecting port, the connecting port connects the cleaning chamber and the fluidizing chamber, the recovery baffle is hinged to the inner wall of the connecting port and is used to cover the connecting port, the recovery box is arranged near the connection between the recovery baffle and the connecting port, and the opening of the recovery box is set in the direction of the recovery baffle.

[0019] By adopting the above technical solution, when the first liquid limiting shell rotates to allow the first solution nozzle to enter the cleaning chamber, the recovery baffle will be driven to rotate, and the connecting port will be immediately closed after being opened. When the recovery baffle rotates, the material powder and material particles that fall on the recovery baffle will be tilted and guided into the recovery box, thereby completing the collection of the material powder and material particles.

[0020] Optionally, the recovery baffle is arranged as an L-shaped plate.

[0021] By adopting the above technical solution, the L-shaped recovery baffle can reduce the probability of material powder and material particles in the recovery box flowing back into the cleaning chamber.

[0022] Optionally, the air treatment device further includes an air filter, and the air filter is arranged at the top of the fluidizing chamber.

[0023] By adopting the above technical solution, the air filter reduces the probability of material powder and material particles flowing to the outside with the air, thereby reducing the loss of material powder.

[0024] Optionally, the temperature controller includes a temperature control tube and a temperature rising resistance wire, the temperature rising resistance wire is arranged around the temperature control tube, one end of the temperature control tube is connected to the air filter, and the other end of the temperature control tube is connected to the bottom end of the air distribution plate.

[0025] By adopting the above technical solution, the temperature of the air in the temperature control tube can be controlled by allowing the air to flow in the temperature control tube and controlling the working state of the heating resistance wire, thereby realizing the regulation of the air temperature in the fluidizing chamber, facilitating the evaporation of water in the material particles, and accelerating the formation of the material particles.

[0026] Optionally, a first regulating motor and a second regulating motor are arranged in the middle of the liquid spraying wheel, the first regulating motor is connected to the first liquid limiting shell, and the second regulating motor is connected to the second liquid limiting shell.

[0027] By adopting the above technical solution, the first liquid limiting shell is driven by the first regulating motor to adjust the position of the first solution nozzle, and the second liquid limiting shell is driven by the second regulating motor to adjust the position of the second solution nozzle.

[0028] Optionally, a plurality of air distribution holes are provided on the air distribution plate, and the air distribution holes control the uniform distribution of the air flow passing through the air distribution plate.

[0029] By adopting the above technical solution, the air distribution holes opened on the air distribution plate can evenly distribute the air flowing in the fluidization chamber to meet the fluidization requirements.

[0030] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0031] 1. During fluidized bed granulation, the air nozzle delivers air through the air distributor to drive the material powder in the fluidizing chamber to move in the fluidizing chamber, and the granulation solution in the granulation solution nozzle is sprayed from the first solution port into the fluidizing chamber to gather the material powder to form material particles. After the first solution nozzle sprays the granulation solution for a set time, the second liquid-limiting shell rotates so that the second solution nozzle reaches the solution spraying position, the first solution nozzle stops spraying the granulation solution, and the second solution nozzle starts spraying the granulation solution. The first liquid-limiting shell rotates to transport the first solution nozzle to the position of the cleaning device for cleaning. After the second solution nozzle sprays for a set time, the first solution nozzle is used to spray, which ultimately reduces the influence of the granulation solution nozzle on the granulation effect after a long working process;

[0032] 2. The control baffle controlled by the rotating motor can realize the connection state between the spray hole, the first solution nozzle and the second solution nozzle by rotating, and realize the control of the spray state of the first solution nozzle and the second solution nozzle;

[0033] 3. A recovery baffle is arranged at the connecting port. When the first liquid limiting shell rotates the first solution nozzle to the cleaning chamber and the second liquid limiting shell rotates the second solution nozzle to the cleaning chamber, the recovery baffle can control the opening and closing of the connecting port. When the recovery baffle is opened, the recovery baffle can tilt the material powder and material particles falling on the surface of the recovery baffle to the recovery box for recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the external structure of an embodiment of the present application.

[0035] Figure 2 It is a cross-sectional view of the internal structure of an embodiment of the present application.

[0036] Figure 3 It is a schematic diagram of the structure of the liquid spraying wheel in the embodiment of the present application.

[0037] Figure 4 It is a schematic diagram of the structure of the control baffle in the embodiment of the present application.

[0038] Figure 5 Schematic diagram of the structure of the first liquid limiting shell and the second liquid limiting shell in the embodiment of the present application.

[0039] Figure 6 It is a schematic diagram of the structure of the cleaning device in the embodiment of the present application.

[0040] In the figure: 1. fluidized bed shell; 11. fluidizing chamber; 2. air nozzle; 3. air handling device; 31. air distribution plate; 311. air distribution hole; 32. temperature controller; 321. temperature control tube; 322. heating resistance wire; 33. air filter; 4. granulation solution nozzle; 41. first liquid limiting shell; 411. first solution nozzle; 42. second liquid limiting shell; 421. second solution nozzle; 43. liquid spraying wheel; 431. liquid spraying hole; 432. control baffle; 44. cleaning device; 441. dustproof shell; 4411. cleaning chamber; 4412. connecting port; 442. cleaning brush; 443. debris recovery part; 4431. recovery baffle; 4432. recovery box; 45. first regulating motor; 46. second regulating motor; 5. rotating motor. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-Figure 6 This application is described in further detail.

[0042] The present application example discloses a high-purity malic acid granulation fluidized bed. Figure 1 and Figure 2 A high-purity malic acid granulation fluidized bed comprises a fluidized bed shell 1, an air treatment device 3 and a granulation solution nozzle 4.

[0043] A fluidizing chamber 11 is provided in the fluidized bed shell 1, and an air nozzle 2 is arranged at the bottom of the fluidizing chamber 11. The air treatment device 3 includes an air distribution plate 31, an air filter 33 and a temperature controller 32. The air distribution plate 31 is arranged at the bottom of the fluidized bed shell 1 and above the air nozzle 2, the air filter 33 is arranged at the top of the fluidizing chamber 11, and the temperature controller 32 connects the top of the air filter 33 and the bottom of the air distribution plate 31. The granulation solution nozzle 4 includes a first liquid limiting shell 41, a second liquid limiting shell 42, a liquid spraying wheel 43 and a cleaning device 44. The first liquid limiting shell 41 and the second liquid limiting shell 42 are arranged on both sides of the liquid spraying wheel 43 and are sleeved with the liquid spraying wheel 43. The first liquid limiting shell 41 and the second liquid limiting shell 42 can both rotate relative to the liquid spraying wheel 43. The first liquid limiting shell 41 is provided with a first solution nozzle 411, and the second liquid limiting shell 42 is provided with a second solution nozzle 421. The liquid spraying wheel 43 controls the communication between the first solution nozzle 411 and the second solution nozzle 421. One side of the cleaning device 44 is connected to the fluidized bed shell 1, and the other side of the cleaning device 44 is connected to the first liquid limiting shell 41 and the second liquid limiting shell 42.

[0044] When the fluidized bed is granulating, the air nozzle 2 blows air in the direction of the air distribution plate 31, and the air flow blows the material powder in the fluidizing chamber 11, and then the first solution nozzle 411 on the first liquid limiting shell 41 sprays the granulation solution into the fluidizing chamber 11. The air flow in the fluidizing chamber 11 passes through the air filter 33 and the temperature controller 32 to increase the temperature in the fluidizing chamber 11, thereby accelerating the fluidized bed granulation. After the first solution nozzle sprays the granulation solution for a set time, the second liquid limiting shell 42 rotates, driving the second solution nozzle 421 to the solution spraying position, the first solution nozzle 411 stops spraying the granulation solution, and the second solution nozzle 421 starts spraying the granulation solution under the control of the liquid spraying wheel 43. The first liquid limiting shell 41 rotates, driving the position of the cleaning device 44 when the first solution nozzle 411 rotates. The cleaning device 44 removes the material powder and material particles attached to the vicinity of the first solution nozzle 411. After the second solution nozzle 421 sprays the granulation solution for a set time, the first liquid limiting shell 41 rotates, driving The first solution nozzle 411 returns to the solution spraying position, the second solution nozzle 421 stops spraying the granulation solution, the first solution nozzle 411 starts spraying the granulation solution, and the second liquid limiting shell 42 rotates so that the second solution nozzle 421 enters the cleaning device 44 to clean the second solution nozzle 421, completing the spraying cycle of the first solution nozzle 411 and the second solution nozzle 421, reducing the probability of material powder and material particle accumulation near the first solution nozzle 411 and the second solution nozzle 421, and ultimately reducing the influence of the granulation solution nozzle 4 on the granulation effect after a long period of work.

[0045] Reference Figure 2The air distribution plate 31 is provided with a plurality of air distribution holes 311, which are evenly arranged on the air distribution plate 31 and connected to the upper and lower ends of the air distribution plate 31. The air ejected from the air nozzle 2 is blocked by the air distribution plate 31 when passing through the air distribution plate 31, and the air passes through the air distribution holes 311 on the air distribution plate 31, thereby contacting the material powder in the fluidizing chamber 11.

[0046] Reference Figure 2 , Figure 3 and Figure 4 A liquid spray hole 431 is provided inside the liquid spray wheel 43, and a control baffle 432 is arranged inside the liquid spray hole 431. The control baffle 432 is connected to a rotating motor 5, and the rotating motor 5 is coaxially arranged with the liquid spray hole 431. The control baffle 432 rotates with the operation of the rotating motor 5. When the rotation position of the control baffle 432 changes, the connection state of the first solution nozzle 411 and the connection state of the second solution nozzle 421 change accordingly.

[0047] The granulation solution is sprayed out from the spray hole 431 of the spray wheel 43. After the granulation solution is sprayed out, it is redirected by the control baffle 432 controlled by the rotating motor 5, and flows from the spray hole 431 to the first solution nozzle 411 or to the second solution nozzle 421, and finally sprayed out from the first solution nozzle 411 or from the second solution nozzle 421.

[0048] Reference Figure 3 and Figure 5 A first regulating motor 45 and a second regulating motor 46 are coaxially arranged in the middle of the liquid spraying wheel 43. The first regulating motor 45 is connected to the first liquid limiting shell 41, and the first regulating motor 45 controls the rotation of the liquid spraying wheel 43 provided in the first liquid limiting shell 41. The second regulating motor 46 is connected to the second liquid limiting shell 42, and the second regulating motor 46 controls the rotation of the liquid spraying wheel 43 provided in the second liquid limiting shell 42.

[0049] The first regulating motor 45 drives the first liquid limiting housing 41 to rotate to adjust the position of the first solution nozzle 411 , and the second regulating motor 46 drives the second liquid limiting housing 42 to rotate to adjust the position of the second solution nozzle 421 .

[0050] Reference Figure 2 and Figure 6 The cleaning device 44 includes a dustproof shell 441, a cleaning brush 442 and a debris recovery member 443. A cleaning chamber 4411 is provided in the dustproof shell 441, a cleaning brush 442 is arranged in the cleaning chamber 4411, the cleaning brush 442 is arranged on the movement path of the first solution nozzle 411 and the second solution nozzle 421, and the debris recovery member 443 is arranged at the bottom end of the cleaning chamber 4411.

[0051] The cleaning device 44 forms a cleaning chamber 4411 isolated from the fluidizing chamber 11 through a dustproof shell 441. When the first solution nozzle 411 or the second solution nozzle 421 rotates into the cleaning chamber 4411, the cleaning brush 442 removes material powder or material particles attached to the vicinity of the first solution nozzle 411 or the second solution nozzle 421. The cleaned material powder and material particles are recovered through the debris recovery part 443.

[0052] Reference Figure 2 and Figure 6 The debris recovery part 443 includes a recovery baffle 4431 and a recovery box 4432. A communication port 4412 is provided at a position where the dust cover 441 overlaps with the movement paths of the first solution nozzle 411 and the second solution nozzle 421. The recovery baffle 4431 is hinged to the inner wall of the communication port 4412. The hinge position of the recovery baffle 4431 and the communication port 4412 is far away from the liquid spraying wheel 43. The recovery box 4432 is arranged near the hinge position of the recovery baffle 4431 and the communication port 4412, and the opening direction of the recovery box 4432 faces the direction of the recovery baffle 4431. The recovery baffle 4431 is arranged in an L shape. After the recovery baffle 4431 rotates, one end of the recovery baffle 4431 enters the opening of the recovery box 4432.

[0053] When the debris recovery part 443 recovers the material powder and material particles cleaned by the cleaning brush 442, the fallen material powder and material particles are sent to the recovery box 4432 through the recovery baffle 4431. The movement of the recovery baffle 4431 is triggered by the rotation of the first liquid limiting shell 41 and the rotation of the second liquid limiting shell 42. When the first solution nozzle 411 or the second solution nozzle 421 rotates to the cleaning chamber 4411, the recovery baffle 4431 rotates to tilt the material particles and material powder dropped on the recovery baffle 4431 into the recovery box 4432 under the action of gravity. When the recovery baffle 4431 returns to its original position, the L-row recovery baffles 4431 will block the opening of the recovery box 4432, reducing the probability of the material powder and material particles in the recovery box 4432 returning to the cleaning chamber 4411.

[0054] Reference Figure 1 and Figure 2 The temperature controller 32 includes a temperature control tube 321 and a temperature-raising resistor 322. The temperature-raising resistor 322 surrounds the outside of the temperature control tube 321. One end of the temperature control tube 321 is connected to the air filter 33, and the other end of the temperature control tube 321 is connected to the bottom of the air distribution plate 31. The temperature-raising resistor 322 heats the air in the temperature control tube 321, increases the temperature of the air in the fluidizing chamber 11, and accelerates the formation of material particles.

[0055] The implementation principle of a high-purity malic acid granulation fluidized bed in the embodiment of the present application is as follows: during fluidized bed granulation, the air nozzle 2 delivers air into the fluidizing chamber 11, and the air is evenly blown toward the material powder in the fluidizing chamber 11 after passing through the air distribution plate 31, and the first solution nozzle 411 on the granulation solution nozzle 4 sprays the granulation solution into the fluidizing chamber 11, so that the material powder forms material particles, and the temperature controller 32 controls the air temperature in the fluidizing chamber 11, promotes the evaporation of water vapor in the material particles, and accelerates the formation of the material particles. After the first solution nozzle 411 sprays the solution for a set time, the second liquid-limiting shell 42 rotates, driving the second solution nozzle 421 to reach the solution spraying position, and under the action of the liquid spraying wheel 43, the first solution nozzle 411 stops spraying the solution, and the second solution nozzle 421 starts spraying the solution, and the first liquid-limiting shell 41 rotates to drive the first solution nozzle 411 to the position of the cleaning device 44, and the cleaning device 44 cleans the material particles and material powder attached near the first solution nozzle 411. When the second solution nozzle 421 sprays the solution for the set time, the first liquid limiting shell 41 rotates to drive the first solution nozzle 411 to rotate to the spraying position, the second solution nozzle 421 stops spraying the solution, and the first solution nozzle 411 starts spraying the solution, and the second liquid limiting shell 42 drives the second solution nozzle 421 to rotate into the cleaning device 44, so as to clean the material particles and material powder attached to the second solution nozzle 421, realize the circulation of the material sprayed by the first solution nozzle 411 and the second solution nozzle 421, reduce the probability of accumulation of material powder and material particles at the first solution nozzle 411 and the second solution nozzle 421, and finally reduce the influence of the granulation solution nozzle 4 on the granulation effect after a long working process.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-purity malic acid granulation fluidized bed, characterized in that: include: A fluidized bed shell (1) is provided with a fluidizing chamber (11) inside, and an air nozzle (2) is provided at the bottom of the fluidizing chamber (11); An air treatment device (3), comprising an air distribution plate (31) and a temperature controller (32), wherein the air distribution plate (31) is arranged at the bottom of the fluidizing chamber (11) and located above the air nozzle (2), the air distribution plate (31) is used to control the flow direction of the air sprayed from the air nozzle (2), and the temperature controller (32) is connected to the fluidizing chamber (11), and is used to control the air temperature in the fluidizing chamber (11); The granulation solution nozzle (4) comprises a first liquid-limiting shell (41), a second liquid-limiting shell (42), a liquid-spraying rotor (43) and a cleaning device (44); the first liquid-limiting shell (41) and the second liquid-limiting shell (42) are both arranged above the air distribution plate (31); the first liquid-limiting shell (41) is provided with a first solution spraying port (411); the second liquid-limiting shell (42) is provided with a second solution spraying port (421); the liquid-spraying rotor (43) is arranged between the first liquid-limiting shell (41) and the second liquid-limiting shell (42). In the second liquid-limiting shell (42), the first liquid-limiting shell (41) and the second liquid-limiting shell (42) are both rotatably connected to the liquid spraying wheel (43), and the liquid spraying wheel (43) is used to transport the granulation solution and control the connection between the first solution nozzle (411) and the second solution nozzle (421). The cleaning device (44) is connected to the fluidized bed shell (1), and the cleaning device (44) is used to clean the first solution nozzle (411) and the second solution nozzle (421).

2. A high-purity malic acid granulation fluidized bed according to claim 1, characterized in that: A liquid spray hole (431) is provided in the liquid spray wheel (43), and a control baffle (432) is arranged in the liquid spray hole (431). The control baffle (432) is used to control the communication between the liquid spray hole (431) and the first solution nozzle (411) and the second solution nozzle (421).

3. A high-purity malic acid granulation fluidized bed according to claim 2, characterized in that: The control baffle (432) is connected to a rotating motor (5), and the rotating motor (5) controls the control baffle (432) to rotate and close the first solution nozzle (411) or the second solution nozzle (421).

4. A high-purity malic acid granulation fluidized bed according to claim 1, characterized in that: The cleaning device (44) comprises a dustproof shell (441), a cleaning brush (442) and a debris recovery unit (443); a cleaning chamber (4411) is provided in the dustproof shell (441); the cleaning brush (442) is arranged in the cleaning chamber (4411); the cleaning brush (442) is used to clean the first solution nozzle (411) or the second solution nozzle (421); the debris recovery unit (443) is arranged at the bottom end of the cleaning chamber (4411); the debris recovery unit (443) is used to recover debris cleaned by the cleaning brush (442).

5. A high-purity malic acid granulation fluidized bed according to claim 4, characterized in that: The debris recovery part (443) includes a recovery baffle (4431) and a recovery box (4432); the dustproof shell (441) is provided with a connecting port (4412); the connecting port (4412) connects the cleaning chamber (4411) and the fluidizing chamber (11); the recovery baffle (4431) is hinged to the inner wall of the connecting port (4412) and is used to cover the connecting port (4412); the recovery box (4432) is arranged near the connection between the recovery baffle (4431) and the connecting port (4412); the opening of the recovery box (4432) is arranged in the direction of the recovery baffle (4431).

6. A high-purity malic acid granulation fluidized bed according to claim 5, characterized in that: The recovery baffle (4431) is arranged as an L-shaped plate.

7. The high-purity malic acid granulation fluidized bed according to claim 1, characterized in that: The air treatment device (3) further comprises an air filter (33), wherein the air filter (33) is arranged at the top end of the fluidizing chamber (11).

8. A high-purity malic acid granulation fluidized bed according to claim 7, characterized in that: The temperature controller (32) comprises a temperature control tube (321) and a temperature-raising resistance wire (322), wherein the temperature-raising resistance wire (322) is arranged around the temperature control tube (321), one end of the temperature control tube (321) is connected to the air filter (33), and the other end of the temperature control tube (321) is connected to the bottom end of the air distribution plate (31).

9. The high-purity malic acid granulation fluidized bed according to claim 1, characterized in that: A first regulating motor (45) and a second regulating motor (46) are arranged in the middle of the liquid spraying wheel (43); the first regulating motor (45) is connected to the first liquid limiting housing (41), and the second regulating motor (46) is connected to the second liquid limiting housing (42).

10. The high-purity malic acid granulation fluidized bed according to claim 1, characterized in that: The air distribution plate (31) is provided with a plurality of air distribution holes (311), and the air distribution holes (311) control the uniform distribution of airflow passing through the air distribution plate (31).

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