Fluidized bed for producing few-walled carbon nanotubes

Abstract

The invention relates to a fluidized bed for producing few-walled carbon nanotubes, in particular to the technical field of fluidized beds for producing few-walled carbon nanotubes. The fluidized bed comprises a fluidized bed body, the bottom of the fluidized bed body is communicated with a middle pipe, the bottom of the middle pipe is communicated with a converging shell, the outer side of the converging shell is uniformly communicated with a plurality of ventilation pipes, and the interiors of the ventilation pipes, the interior of the converging shell, the interior of the middle pipe and the interior of the fluidized bed body are all communicated. And a mixing assembly is arranged on the middle pipe and enables various gases to be fully and uniformly mixed. The device has the effects that the gas finally entering the fluidized bed is a product obtained by fully mixing various gases, and the manufacturing efficiency of the few-walled carbon nanotubes is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized bed for producing oligo-walled carbon nanotubes, in particular to a fluidized bed for producing oligo-walled carbon nanotubes. Background Art

[0002] Carbon nanotubes, also known as buckytubes, are a unique one-dimensional quantum material with radial dimensions measured in nanometers and axial dimensions measured in micrometers, with both ends essentially sealed. Carbon nanotubes are primarily composed of several to dozens of layers of coaxial circular tubes of carbon atoms arranged in a hexagonal pattern. The distance between layers is fixed, approximately 0.34 nm, and the diameter is typically 2 to 20 nm. Depending on the axial orientation of the carbon hexagons, carbon nanotubes can be categorized into three types: zigzag, armchair, and helical. Helical carbon nanotubes exhibit chirality, while zigzag and armchair carbon nanotubes lack chirality.

[0003] A fluidized bed is a reactor that uses gas or liquid to pass through a granular solid layer to put the solid particles into a suspended motion state and carry out a gas-solid phase reaction process or a liquid-solid phase reaction process.

[0004] The production of oligo-walled carbon nanotubes usually requires the use of a fluidized bed. Operators introduce various gases into the fluidized bed and heat the fluidized bed to obtain oligo-walled carbon nanotubes.

[0005] As the multiple gases enter the fluidized bed, since the multiple gases directly enter the fluidized bed, the mixing degree of the multiple gases is low, thereby affecting the manufacturing effect of the oligo-walled carbon nanotubes. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a fluidized bed for producing oligo-walled carbon nanotubes, which has the effect of making the gas finally entering the fluidized bed a product of a thorough mixture of multiple gases, thereby improving the production efficiency of oligo-walled carbon nanotubes.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: A fluidized bed for producing oligo-walled carbon nanotubes includes a fluidized bed body, the bottom of the fluidized bed body is connected to an intermediate tube, the bottom of the intermediate tube is connected to a converging shell, the outside of the converging shell is evenly connected to a number of ventilation pipes, the interiors of the several ventilation pipes, the interior of the converging shell, the interior of the intermediate tube and the interior of the fluidized bed body are all connected, and a mixing component is provided on the intermediate tube, which allows various gases to be fully and evenly mixed.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the mixing assembly includes a rotating tube, the rotating tube is disposed in the intermediate tube, two annular plates are symmetrically disposed on the outer circumference of the rotating tube, and the annular plates are connected to the inner wall of the intermediate tube via balls; Two connecting rods are arranged inside the rotating tube, and the two connecting rods are arranged crosswise. The vertical cross-section of the two connecting rods after being combined is X-shaped.

[0009] In a preferred example, the present invention may be further configured as follows: the mixing assembly further includes a power unit; The power unit includes a motor, which is fixedly arranged on the top of one of the ventilation pipes. A gear is provided at the output end of the motor. A gear ring is fixedly provided on the outer peripheral surface of the rotating tube. The gear part extends into the middle tube and meshes with the gear ring.

[0010] In a preferred example, the present invention can be further configured as follows: an air intake fan portion is fixedly provided on the upper half of the interior of the intermediate tube, and the air intake fan portion is located directly above the rotating tube.

[0011] In a preferred embodiment, the present invention can be further configured as follows: a partition plate is provided in the merging shell, the partition plate divides the interior of the merging shell into a plurality of identical flow chambers and a merging chamber, the number of the flow chambers is equal to the number of the vent pipes, and the interiors of the flow chambers are connected to the interiors of the corresponding vent pipes; The interiors of any two flow chambers are not connected.

[0012] In a preferred embodiment, the present invention can be further configured as follows: each of the ventilation pipes is provided with a heating portion, the heating portion comprising a mounting seat and a heating pipe, the mounting seat is connected to the corresponding ventilation pipe by bolts, and the heating pipe is located inside the corresponding ventilation pipe; The mounting seat and the contact surface corresponding to the vent pipe are both provided with sealing strips.

[0013] In a preferred embodiment, the present invention can be further configured as follows: a plurality of inclined plates are provided on the top of the inner wall of each flow chamber, and the inclined plates are not in contact with the corresponding heating tubes; The lower halves of the plurality of inclined plates are inclined toward the corresponding directions of the vent pipes.

[0014] In a preferred example, the present invention can be further configured as follows: a plurality of ventilation holes are provided on the plurality of partition plates in contact with the merging cavity.

[0015] In a preferred embodiment, the present invention can be further configured as follows: a flow limiting component is provided in each of the ventilation tubes; The flow limiting assembly includes a cover plate, and an opening is formed on the top of each of the vent pipes. The cover plate is connected to the corresponding vent pipe by bolts, and the cover plate covers the corresponding opening; A positioning tube is placed in each of the ventilation tubes through an insert, and a flow valve is provided at one end of the positioning tube, and the interior of the flow valve is connected to the interior of the corresponding positioning tube; The positioning tube is connected to the corresponding cover plate through bolts.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects: 1. By arranging a mixing component in the middle, the mixing component quickly mixes multiple gases, so that the gas that finally enters the fluidized bed is a product of fully mixed multiple gases, thereby improving the production effect of oligo-walled carbon nanotubes.

[0017] 2. By setting a flow limiting component in each ventilation pipe, the operator can accurately control the inflow of various gases per unit time.

[0018] 3. By providing a heating tube, the gas is heated by the heating tube, so that the molecules in the gas are accelerated to move, and before entering the intermediate tube, a state of mixing of multiple gas parts is achieved, further improving the mixing effect.

[0019] 4. By arranging a number of inclined plates in the flow chamber, the gas is heated and in an upward state. The arrangement of the several inclined plates increases the movement time of the gas in the flow chamber, thereby increasing the gas heating time in disguised form. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall half-section structure of this embodiment; Figure 2 yes Figure 1 A in the middle is an enlarged structural diagram; Figure 3 yes Figure 1 The enlarged structural diagram at B in the middle; Figure 4 yes Figure 1 Enlarged structural diagram at point C in the middle.

[0021] In the figure, 1. fluidized bed body; 11. intermediate tube; 12. converging shell; 13. ventilation pipe; 2. mixing assembly; 21. rotating tube; 22. annular plate; 23. connecting rod; 211. motor; 24. gear; 25. gear ring; 3. suction fan part; 4. partition plate; 41. flow chamber; 42. converging chamber; 5. mounting seat; 51. heating tube; 52. inclined plate; 6. ventilation hole; 7. flow limiting assembly; 71. cover plate; 72. positioning tube; 73. flow valve. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Example: Reference Figures 1-4 As shown, the fluidized bed for producing oligo-walled carbon nanotubes disclosed in the present invention includes a fluidized bed body 1, the bottom of which is connected to an intermediate pipe 11. The bottom of intermediate pipe 11 is connected to a converging shell 12. The outer side of converging shell 12 is uniformly connected to a plurality of vent pipes 13. The interiors of the vent pipes 13, the interior of the converging shell 12, the interior of the intermediate pipe 11, and the interior of the fluidized bed body 1 are all interconnected. Different gases circulate through the vent pipes 13.

[0024] The mixing assembly 2 is mounted on the intermediate tube 11, ensuring a thorough and uniform mixing of the various gases. The mixing assembly 2 comprises a rotating tube 21, which is positioned within the intermediate tube 11. Two annular plates 22 are symmetrically positioned on the outer circumference of the rotating tube 21. The annular plates 22 are connected to the inner wall of the intermediate tube 11 via ball bearings. The annular plates 22 make contact with the inner wall of the intermediate tube 11, preventing gas from flowing in through the gap between the annular plates 22 and the intermediate tube 11.

[0025] Two connecting rods 23 are provided inside the rotating tube 21. The two connecting rods 23 are cross-arranged, and the vertical cross-section of the two connecting rods 23 after being combined is X-shaped. The mixing assembly 2 also includes a power unit. The power unit includes a motor 211, which is fixedly arranged on the top of one of the ventilation tubes 13. A gear 24 is provided at the output end of the motor 211. A gear ring 25 is fixedly provided on the outer peripheral surface of the rotating tube 21. The gear 24 partially extends into the middle tube 11 and meshes with the gear ring 25. The motor 211 drives the gear 24 to rotate, the gear 24 drives the gear ring 25 to rotate, and the gear ring 25 drives the rotating tube 21 to rotate. The rotating tube 21 drives the two connecting rods 23 to move. The two connecting rods 23 are cross-arranged to fully mix the gas entering the rotating tube 21.

[0026] An air intake fan 3 is fixedly mounted in the upper half of the intermediate tube 11, located directly above the rotating tube 21. The thoroughly mixed gas is drawn into the fluidized bed body 1 through the air intake fan 3. The distance between the air intake fan 3 and the intermediate tube 11 is small, and due to the strong air intake capacity of the air intake fan 3, the mixed gas cannot escape through the gap between the air intake fan 3 and the intermediate tube 11.

[0027] It is explained here that the air suction fan section 3 is always in operation before the intermediate tube 11 rotates and after the intermediate tube 11 stops rotating. The gas entering the intermediate tube 11 first passes through the connecting rod 23 and then enters the air suction fan section 3.

[0028] A flow limiting assembly 7 is provided in each vent tube 13. This precisely controls the amount of gas entering the confluence housing 12 per unit time. The flow limiting assembly 7 includes a cover plate 71. Each vent tube 13 has an opening at the top. The cover plate 71 is connected to the corresponding vent tube 13 via bolts, and the cover plate 71 shields the corresponding opening. A positioning tube 72 is positioned in each vent tube 13 via an insert. A flow valve 73 is provided at one end of the positioning tube 72. The interior of the flow valve 73 is connected to the interior of the corresponding positioning tube 72. The positioning tube 72 is connected to the corresponding cover plate 71 via bolts.

[0029] A partition plate 4 is provided within the merging housing 12. This partition plate 4 divides the interior of the merging housing 12 into several identical flow chambers 41 and a merging chamber 42. The number of flow chambers 41 is equal to the number of vent tubes 13, and the interiors of the flow chambers 41 are connected to the interiors of the corresponding vent tubes 13. The interiors of any two flow chambers 41 are not connected. Each flow chamber 41 is an independent space.

[0030] A plurality of vent holes 6 are provided on the plurality of partition plates 4 that are in contact with the merging chamber 42 . The gas in the flow chamber 41 flows into the merging chamber 42 through the vent holes 6 .

[0031] Each vent tube 13 is equipped with a heating unit, which includes a mounting base 5 and a heating tube 51. The mounting base 5 is connected to the corresponding vent tube 13 by bolts, and the heating tube 51 is located inside the corresponding vent tube 13. The contact surface between the mounting base 5 and the corresponding vent tube 13 is provided with a sealing strip to further prevent gas from leaking out.

[0032] The heating tube 51 accelerates gas flow. The heated gas enters the confluence chamber 42, maintaining an accelerated flow state and allowing the various gases to mix in advance. It should be noted that the heating tube 51 in the flow chamber 41 is already in operation before the gas is introduced. It is only turned off after the gas flow is completed.

[0033] Each flow chamber 41 is topped with several inclined plates 52, which do not contact the corresponding heating tube 51. The lower halves of the inclined plates 52 are angled toward the corresponding vent tube 13. As the heated gas rises, it is blocked by the inclined plates 52, increasing the distance the gas travels within the flow chamber 41 and, in turn, the duration of heating.

[0034] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fluidized bed for producing oligo-walled carbon nanotubes, comprising a fluidized bed body (1), wherein the bottom of the fluidized bed body (1) is connected to an intermediate tube (11), the bottom of the intermediate tube (11) is connected to a merging shell (12), the outside of the merging shell (12) is evenly connected to a plurality of ventilation tubes (13), the interiors of the plurality of ventilation tubes (13), the interior of the merging shell (12), the interior of the intermediate tube (11) and the interior of the fluidized bed body (1) are all connected, characterized in that: The intermediate tube (11) is provided with a mixing assembly (2), and the mixing assembly (2) enables various gases to be fully and evenly mixed.

2. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 1, characterized in that: The mixing assembly (2) comprises a rotating tube (21), the rotating tube (21) being arranged in the intermediate tube (11), two annular plates (22) being symmetrically arranged on the outer circumference of the rotating tube (21), the annular plates (22) being connected to the inner wall of the intermediate tube (11) via balls; Two connecting rods (23) are provided inside the rotating tube (21), and the two connecting rods (23) are arranged crosswise, and the vertical cross-section of the two connecting rods (23) after being combined is X-shaped.

3. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 2, characterized in that: The mixing assembly (2) further includes a power unit; The power unit comprises a motor (211), the motor (211) being fixedly arranged on the top of one of the ventilation tubes (13), a gear (24) being arranged at the output end of the motor (211), a gear ring (25) being fixedly arranged on the outer peripheral surface of the rotating tube (21), and the gear (24) partially extending into the middle tube (11) and meshing with the gear ring (25).

4. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 3, characterized in that: An air intake fan unit (3) is fixedly provided on the upper half of the interior of the intermediate tube (11), and the air intake fan unit (3) is located directly above the rotating tube (21).

5. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 4, characterized in that: A partition plate (4) is provided in the merging shell (12), and the partition plate (4) divides the interior of the merging shell (12) into a plurality of identical flow chambers (41) and a merging chamber (42). The number of the flow chambers (41) is equal to the number of the ventilation pipes (13), and the interior of the flow chamber (41) is connected to the interior of the corresponding ventilation pipe (13); The interiors of any two flow chambers (41) are not interconnected.

6. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 5, characterized in that: Each of the ventilation pipes (13) is provided with a heating portion, the heating portion comprising a mounting seat (5) and a heating pipe (51), the mounting seat (5) being connected to the corresponding ventilation pipe (13) via bolts, and the heating pipe (51) being located inside the corresponding ventilation pipe (13); The contact surface between the mounting seat (5) and the corresponding vent pipe (13) is provided with a sealing strip.

7. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 6, characterized in that: A plurality of inclined plates (52) are provided on the top of the inner wall of each flow cavity (41), and the inclined plates (52) are not in contact with the corresponding heating tubes (51); The lower halves of the plurality of inclined plates (52) are inclined toward the corresponding vent pipes (13).

8. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 7, characterized in that: A plurality of vent holes (6) are provided on the plurality of partition plates (4) in contact with the merging cavity (42).

9. The fluidized bed for producing oligo-walled carbon nanotubes according to claim 8, characterized in that: A flow limiting component (7) is provided in each of the vent pipes (13); The flow limiting assembly (7) includes a cover plate (71), and an opening is provided at the top of each of the vent pipes (13). The cover plate (71) is connected to the corresponding vent pipe (13) via bolts, and the cover plate (71) shields the corresponding opening. A positioning tube (72) is positioned and placed in each of the ventilation tubes (13) through an insert, a flow valve (73) is provided at one end of the positioning tube (72), and the interior of the flow valve (73) is connected to the interior of the corresponding positioning tube (72); The positioning tube (72) is connected to the corresponding cover plate (71) via bolts.

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