Fluidized bed for producing aluminum fluoride

Abstract

The utility model discloses a fluidized bed for producing aluminum fluoride, which comprises a box body, the top and the side part of the box body are respectively provided with a feed port and an air inlet, and the air inlet is externally connected with an air inlet pipeline. A plurality of sets of rotatable conveying belts are arranged in an inner cavity of the box body in an up-down staggered mode. The device further comprises a bucket elevator, a feeding pipe and a discharging pipe are arranged on the upper side and the lower side of the bucket elevator respectively, and a backflow inlet is formed in the top of the box body. The utility model relates to the technical field of aluminum fluoride production, the fluidized bed for producing aluminum fluoride can prolong the contact reaction time of aluminum hydroxide particles and hydrogen fluoride gas in a limited space by arranging a plurality of conveyor belts which are distributed in a staggered manner, and further, the contact reaction time of the aluminum hydroxide particles and the hydrogen fluoride gas can be prolonged by arranging a bucket elevator. Aluminum hydroxide particles can circularly move on the conveying belt, so that the contact time of the aluminum hydroxide particles and hydrogen fluoride gas is greatly prolonged, and the preparation efficiency of aluminum fluoride can be fully ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum fluoride production, in particular to a fluidized bed for producing aluminum fluoride. Background Art

[0002] A fluidized bed is a reactor that uses a gas or liquid to pass through a granular solid layer to make the solid particles in a suspended motion state and carry out a gas-solid phase reaction process or a liquid-solid phase reaction process.

[0003] For example, a fluidized bed for producing aluminum fluoride disclosed in the Chinese authorized patent CN 213193638 U has a conveying device arranged in the middle of the fluidized bed, which can transport materials controllably, continuously and dispersedly. The gas enters from the lower part and passes through the conveyor belt to fully contact and react with the materials, and can cool the materials, with high production efficiency and easy control.

[0004] After the inventor studied the above device, it was found that there are some areas for improvement. First, there is only one conveyor belt for transporting aluminum hydroxide particles, and whether the aluminum hydroxide particles can fully react with hydrogen fluoride completely depends on the length of the conveyor belt. In fact, due to site limitations, the length of the conveyor belt often fails to achieve the expected purpose, so it is difficult to ensure sufficient contact reaction between the aluminum hydroxide particles and hydrogen fluoride gas. Second, its cooling space is connected to the chemical reaction space, and its exhaust port adopts a direct external discharge method, which causes a large amount of hydrogen fluoride waste gas after the reaction to be discharged into the environment, which is harmful to the environment and causes resource waste. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a fluidized bed for producing aluminum fluoride, which solves the problems of low production efficiency of the existing fluidized bed for producing aluminum fluoride and a large amount of waste gas discharged into the environment and polluting the environment.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the utility model provides the following technical solutions: A fluidized bed for producing aluminum fluoride includes a box body, and a feed inlet and an air inlet are respectively arranged at the top and side of the box body, and an air inlet pipe is externally connected to the air inlet.

[0009] A plurality of groups of rotatable conveyor belts are arranged up and down in a staggered manner in the inner cavity of the box body.

[0010] It further includes a bucket elevator. A feed pipe and a discharge pipe are respectively arranged on the upper and lower sides of the bucket elevator. A reflux inlet is arranged at the top of the box body. The bucket elevator forms a closed-loop reflux channel with the inside of the box body through the feed pipe, the discharge pipe and the reflux inlet.

[0011] A rotatable valve plate is arranged inside the box body. The valve plate is located between the feed pipe and the conveyor belt at the bottommost layer, and the valve plate is used to adjust the flow direction of the material.

[0012] It further includes a conveying box, and a rotatable spiral feeding shaft is installed inside the conveying box. The spiral feeding shaft is driven by an external motor, and a discharge pipe is arranged at the bottom of the conveying box.

[0013] As a further preference, a cooling sandwich layer is arranged inside the conveying box, and the cooling sandwich layer is communicated with the outside through a water inlet and a water outlet respectively.

[0014] As a further preference, a discharge pipe with a switch valve is arranged at the bottom of the bucket elevator.

[0015] As a further preference, an exhaust port is arranged at the top of the box body, and the exhaust port is communicated with the intake pipeline through a return pipe.

[0016] As a further preference, multiple groups of rotatable spreading shafts are arranged above the conveyor belt.

[0017] (III) Beneficial effects

[0018] The utility model provides a fluidized bed for producing aluminum fluoride, which has the following beneficial effects:

[0019] For the fluidized bed for producing aluminum fluoride, by arranging multiple conveyor belts distributed in a staggered manner, the contact reaction time between aluminum hydroxide particles and hydrogen fluoride gas can be extended within a limited space. Further, by arranging a bucket elevator, the aluminum hydroxide particles can move cyclically on the conveyor belt, thereby greatly increasing their contact time with hydrogen fluoride gas, and fully ensuring the preparation efficiency of aluminum fluoride. Secondly, the cooling space of the fluidized bed is separated from the reaction space of the aluminum hydroxide particles, and its exhaust gas outlet is communicated with the intake pipeline. A large amount of exhaust gas is put into the recycling link, so the phenomenon of exhaust gas discharged into the environment is greatly reduced, and at the same time, the utilization rate of resources is improved. Description of the drawings

[0020] Figure 1 It is a structural cross-sectional view of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the utility model.

[0022] In the figure: 1. Box body; 2. Feed inlet; 3. Intake port; 4. Intake pipeline; 5. Conveyor belt; 6. Valve plate; 7. Bucket elevator; 71. Discharge pipe; 72. Feed pipe; 73. Discharge pipe; 8. Return inlet; 9. Conveying box; 10. Motor; 11. Spiral feeding shaft; 12. Discharge pipe; 13. Water inlet; 14. Water outlet; 15. Cooling sandwich layer; 16. Exhaust port; 17. Return pipe; 18. Spreading shaft. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] As Figure 1-2 shown, the present invention provides a technical solution: a fluidized bed for producing aluminum fluoride, including a box body 1, and a feed inlet 2 (equipped with a sealing cover to prevent waste gas from overflowing) and an air inlet 3 are respectively arranged at the top and side of the box body 1, and an air inlet pipe 4 (with a switch valve) is externally connected to the air inlet 3.

[0025] A plurality of groups of rotatable conveyor belts 5 are arranged up and down in a staggered manner in the inner cavity of the box body 1. Each group of conveyor belts 5 corresponds to the position of the air inlet 3. A plurality of groups of rotatable spreading shafts 18 are arranged above the conveyor belts 5. The spreading shafts 18 are driven by an external motor, and the materials are evenly turned over by the spreading shafts 18, thereby improving the reaction efficiency.

[0026] It also includes a bucket elevator 7. A feed pipe 72 and a discharge pipe 71 are respectively arranged on the upper and lower sides of the bucket elevator 7. A return inlet 8 is arranged at the top of the box body 1. The bucket elevator 7 forms a closed-loop return channel with the inside of the box body 1 through the feed pipe 72, the discharge pipe 71 and the return inlet 8.

[0027] A discharge pipe 73 with a switch valve is arranged at the bottom of the bucket elevator 7. Opening the discharge pipe 73 can discharge a small amount of materials, so as to master the specific reaction situation in the box body 1, which is convenient for the operator to adjust the direction of the valve plate 6 in time, so as to complete the discharging in time.

[0028] A rotatable valve plate 6 is arranged in the box body 1. The valve plate 6 is located between the feed pipe 72 and the lowermost conveyor belt 5. The valve plate 6 is used to adjust the flow direction of the materials. In Figure 1 this case, the valve plate 6 is in contact with the feed pipe 72. At this time, the materials flow into the feed pipe 72 through the valve plate 6. When the valve plate 6 is rotated, the valve plate 6 leaves the feed pipe 72, and the materials flow directly along the valve plate 6 to the bottom of the box body 1 and are discharged into the conveying box 9.

[0029] It also includes a conveying box 9. A rotatable screw feeding shaft 11 is installed in the conveying box 9. The screw feeding shaft 11 is driven by an external motor 10. A discharge pipe 12 is arranged at the bottom of the conveying box 9.

[0030] A cooling interlayer 15 is provided inside the conveying box 9. The cooling interlayer 15 is communicated with the outside through a water inlet 13 and a water outlet 14 respectively. The heated hot water is discharged through the water outlet 14.

[0031] An exhaust port 16 is provided at the top of the box body 1. The exhaust port 16 is communicated with the intake pipeline 4 through a return pipe 17. The unreacted exhaust gas enters the box body 1 again through the return pipe 17 and the intake port 3 to continue the reaction. After the complete reaction, the obtained products are only aluminum fluoride and water vapor, which are harmless to the environment.

[0032] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0033] During use, aluminum hydroxide particles enter the box body 1 from the feed inlet 2 and fall onto the topmost conveyor belt 5. Hot hydrogen fluoride gas enters each intake port 3 through the intake pipeline 4 and then enters the box body 1, contacting and reacting with the aluminum hydroxide particles in the box body 1.

[0034] The conveyor belt 5 is driven to rotate by an external motor, thereby driving the aluminum hydroxide particles to move from a high place to a low place. The aluminum hydroxide particles pass through all the conveyor belts 5 in sequence and then enter the feed pipe 72 through the valve plate 6. Then, under the lifting action of the bucket elevator 7, the aluminum hydroxide particles enter the box body 1 again through the discharge pipe 71 and the return inlet 8, and repeat the above process until the aluminum hydroxide particles completely react with the hydrogen fluoride gas.

[0035] After that, rotate the valve plate 6 to change the flow direction of the material, so that the material flows into the conveying box 9 from the bottom of the box body 1. Inject cold water into the cooling interlayer 15 through the water inlet 13 to cool down the material. Start the motor 10 to drive the spiral feeding shaft 11 to rotate, and then drive the material to be discharged from the discharge pipe 12.

[0036] In summary, for this fluidized bed for producing aluminum fluoride, by arranging multiple conveyor belts distributed in a staggered manner, the contact reaction time between aluminum hydroxide particles and hydrogen fluoride gas can be extended within a limited space. Further, by arranging a bucket elevator, the aluminum hydroxide particles can move cyclically on the conveyor belt, thus greatly increasing their contact time with hydrogen fluoride gas, which can fully ensure the preparation efficiency of aluminum fluoride. Secondly, the cooling space of this fluidized bed is separated from the reaction space of the aluminum hydroxide particles, and its exhaust gas outlet is communicated with the intake pipeline. A large amount of exhaust gas is put into the recycling link, so the phenomenon of exhaust gas being discharged into the environment is greatly reduced, and at the same time, the utilization rate of resources is improved.

[0037] It should be noted that all the electrical components mentioned in this article are electrically connected to the external main controller and the 220V or 380V mains power supply. The main controller can be a conventional known device such as a computer for control. Its control principle, internal structure, control switch mode, etc. are all conventional means of the existing technology and are directly cited here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluidized bed for producing aluminum fluoride, characterized in that: It comprises a box body (1), the top and side of the box body (1) are respectively provided with a feed port (2) and an air inlet (3), and the air inlet (3) is externally connected to an air inlet pipeline (4); The inner cavity of the box body (1) is staggered with multiple groups of rotatable conveyor belts (5) arranged in an upper and lower manner; It also includes a bucket elevator (7), wherein a feed pipe (72) and a discharge pipe (71) are respectively arranged on the upper and lower sides of the bucket elevator (7), and a reflux inlet (8) is arranged on the top of the box body (1). The bucket elevator (7) forms a closed-loop reflux channel with the inside of the box body (1) through the feed pipe (72), the discharge pipe (71) and the reflux inlet (8); A rotatable valve plate (6) is provided in the box body (1), the valve plate (6) is located between the feed pipe (72) and the conveyor belt (5) at the bottom layer, and the valve plate (6) is used to adjust the flow direction of the material; It also comprises a conveying box (9), in which a rotatable screw feeding shaft (11) is installed. The screw feeding shaft (11) is driven by an external motor (10), and a discharge pipe (12) is arranged at the bottom of the conveying box (9).

2. A fluidized bed for producing aluminum fluoride according to claim 1, characterized in that: A cooling interlayer (15) is provided in the conveying box (9), and the cooling interlayer (15) is connected to the outside through a water inlet (13) and a water outlet (14).

3. A fluidized bed for producing aluminum fluoride according to claim 1, characterized in that: A discharge pipe (73) with an on-off valve is provided at the bottom of the bucket elevator (7).

4. A fluidized bed for producing aluminum fluoride according to claim 1, characterized in that: An exhaust port (16) is provided on the top of the box body (1), and the exhaust port (16) is connected to the air intake pipe (4) through a return pipe (17).

5. A fluidized bed for producing aluminum fluoride according to claim 1, characterized in that: A plurality of groups of rotatable spreading shafts (18) are arranged above the conveyor belt (5).

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