Fluidized bed reactor for producing single-walled carbon nanotubes

Abstract

The utility model discloses a fluidized bed reactor for producing a single-walled carbon nanotube, which belongs to the technical field of fluidized beds and comprises a reaction shell, a preheating box and a storage box, and the preheating box and the storage box are mounted on two sides of the reaction shell. A feeding connector is connected between the reaction shell and the preheating box in a communicating mode, an induced draft fan with the air inlet end facing the reaction shell is installed at the position of the feeding connector, airflow generated in the working process of the induced draft fan can be used for being in linkage with disturbance blades to rotate, and meanwhile under the action of air pressure generated in the working process of the induced draft fan, the disturbance blades can disturb the reaction shell to rotate. Redundant gas in the material storage box quickly enters the preheating box through the circulating pipe and is conveyed into the reaction shell again after being preheated, so that the gas is distributed more uniformly, the single-walled carbon nanotubes in the reaction shell grow more uniformly, the flowing speed of the gas is increased, the production efficiency of the single-walled carbon nanotubes is improved, and the production cost is reduced. And the yield of the single-walled carbon nanotubes is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized beds, and more specifically to a fluidized bed reactor for producing single-walled carbon nanotubes. Background Art

[0002] Single-walled carbon nanotubes are a type of nanomaterial with a high aspect ratio. Their special tubular structure gives them excellent physical, chemical and mechanical properties, and they have broad application prospects in nanoelectronic devices, optical devices and composite materials.

[0003] At present, chemical vapor deposition is usually used to prepare single-walled carbon nanotubes. When a fluidized bed reactor is used to produce single-walled carbon nanotubes, the gas distribution in the reaction chamber is not uniform, resulting in uneven growth of the single-walled carbon nanotubes in the reaction chamber, resulting in a low yield of single-walled carbon nanotubes, which is not conducive to the production of single-walled carbon nanotubes. The existing patent is a single-walled carbon nanotube fluidized bed reactor, and the patent application number is 202111654400.0, which can make the gas in the reaction shell evenly distributed, and the single-walled carbon nanotubes in the reaction shell grow more uniformly, thereby increasing the yield of single-walled carbon nanotubes, which is more conducive to the production of single-walled carbon nanotubes.

[0004] However, in patent application number 202111654400.0, a reduction chamber is provided on one side of the reaction shell, and the reduction chamber is connected to the gas preheating tank through a circulation pipe. After catalytic reduction in the reduction chamber, excess gas will enter the gas preheating tank through the circulation pipe to realize the gas recycling. Since the excess gas enters the preheating tank in a free flow manner and then enters the reaction shell, the gas flow rate is slow, which affects the reaction rate of the single-walled carbon nanotubes. Therefore, we propose a fluidized bed reactor for the production of single-walled carbon nanotubes to solve the above-mentioned problems. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a fluidized bed reactor for the production of single-walled carbon nanotubes, which can drive the blades to rotate through the airflow linkage disturbance generated during the operation of the induced draft fan. At the same time, under the action of the air pressure generated during the operation of the induced draft fan, the excess gas in the storage box quickly enters the preheating box through the circulation pipe, and is transported to the reaction shell again after preheating. This not only makes the gas distribution more uniform and the single-walled carbon nanotubes in the reaction shell grow more uniformly, but also increases the flow rate of the gas, which is beneficial to improving the production efficiency of the single-walled carbon nanotubes and increasing the output of the single-walled carbon nanotubes.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] A fluidized bed reactor for producing single-walled carbon nanotubes, comprising a reaction shell and a preheating box and a material storage box installed on both sides of the reaction shell, a feed joint being conductively connected between the reaction shell and the preheating box, and an induced draft fan with an air outlet facing the reaction shell being installed at the feed joint;

[0010] A discharge joint is conductively connected between the reaction shell and the storage box;

[0011] A bracket is installed on the inner side of the end of the feed joint and the discharge joint close to the reaction shell, a rotating shaft is rotatably connected to the bracket, a disturbance blade is installed on the outer wall of the rotating shaft located on the inner side of the reaction shell, and a first bevel gear is installed on the end of the rotating shaft away from the bracket;

[0012] A support frame is fixedly connected to the inner bottom wall of the reaction shell, a first shaft is rotatably connected to the top of the support frame, and second bevel gears meshing with the first bevel gear are installed at both ends of the first shaft;

[0013] A circulation pipe is conductively connected between the preheating box and the material storage box.

[0014] Furthermore, a second shaft rod whose bottom end is rotatably connected to the reaction shell is installed on both sides of the support frame, and spoiler blades are symmetrically installed at the axial position of the outer wall of the second shaft rod.

[0015] Furthermore, a first bearing is installed on the bottom wall of the inner cavity of the reaction shell, and the first bearing is interference-connected with the bottom end of the second shaft.

[0016] Furthermore, the rotating shaft passes through the bracket, and a second bearing is installed at the junction of the bracket and the rotating shaft.

[0017] Furthermore, the first shaft rod passes through the top end of the support frame, and a third bearing is installed at the junction of the top end of the support frame and the first shaft rod.

[0018] Furthermore, a feed pipe is installed on the outer wall of the preheating box away from the reaction shell, and a discharge pipe is installed on the outer wall of the storage box away from the reaction shell.

[0019] Furthermore, both the feed pipe and the discharge pipe are equipped with stop valves.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] (1) In this scheme, by starting the induced draft fan, the preheated gas is introduced into the inner side of the reaction shell through the discharge joint. When the gas passes through the discharge joint, the disturbance blades, under the action of the airflow, cause the rotating shaft and the bracket to rotate, thereby driving the first bevel gear and the second bevel gear to rotate the first shaft and the support frame, thereby driving the disturbance blades at the discharge joint to rotate, disturbing the gas inside the reaction shell, and then the excess gas enters the storage box. Under the action of the air pressure generated during the operation of the induced draft fan, the excess gas in the storage box quickly enters the preheating box through the circulation pipe, and is transported to the reaction shell again after preheating. This not only makes the gas distribution more uniform and the single-walled carbon nanotubes in the reaction shell grow more uniformly, but also increases the flow rate of the gas, which is beneficial to improving the production efficiency of the single-walled carbon nanotubes and increasing the output of the single-walled carbon nanotubes.

[0023] (2) In this solution, during the circulation of the airflow inside the reaction shell, the airflow acts on the spoiler blades, causing the second shaft to rotate, so that the spoiler blades and the disturbance blades disperse and disturb the airflow inside the reaction shell in two directions, which can further improve the distribution uniformity of the airflow inside the reaction shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0025] Figure 2 It is a side view schematic diagram of the reaction shell of the utility model;

[0026] Figure 3 It is a schematic cross-sectional view of the AA part of the utility model;

[0027] Figure 4 It is a schematic diagram of the inner structure of the reaction shell of the utility model.

[0028] Description of the numbers in the figure:

[0029] 1. Reaction shell; 2. Preheating box; 3. Storage box; 4. Feed joint; 5. Induced draft fan; 6. Discharge joint; 7. Bracket; 8. Rotating shaft; 9. Disturbing blade; 10. First bevel gear; 11. Support frame; 12. First shaft rod; 13. Second bevel gear; 14. Second shaft rod; 15. Disturbing blade; 16. Circulation pipe; 17. Feed pipe; 18. Discharge pipe. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0031] Example:

[0032] See also Figure 1-4 A fluidized bed reactor for producing single-walled carbon nanotubes, comprising a reaction shell 1 and a preheating box 2 and a material storage box 3 installed on both sides of the reaction shell 1, a feed connector 4 is conductively connected between the reaction shell 1 and the preheating box 2, and an induced draft fan 5 with an air outlet facing the reaction shell 1 is installed at the feed connector 4;

[0033] A discharge connector 6 is conductively connected between the reaction housing 1 and the storage box 3;

[0034] A bracket 7 is installed on the inner side of the end of the feed connector 4 and the discharge connector 6 close to the reaction shell 1, and a rotating shaft 8 is rotatably connected to the bracket 7. A disturbance blade 9 is installed on the outer wall of the rotating shaft 8 located inside the reaction shell 1, and a first bevel gear 10 is installed on the end of the rotating shaft 8 away from the bracket 7;

[0035] A support frame 11 is fixedly connected to the inner bottom wall of the reaction shell 1, and a first shaft 12 is rotatably connected to the top of the support frame 11. Second bevel gears 13 meshing with the first bevel gear 10 are installed at both ends of the first shaft 12;

[0036] A circulation pipe 16 is connected between the preheating box 2 and the material storage box 3;

[0037] It should be noted that, first, the gas is passed into the gas preheating box 2 for preheating, and then the induced draft fan 5 is started to work, and the preheated gas is passed into the inner side of the reaction shell 1 through the discharge joint 6. When the gas passes through the discharge joint 6, the disturbance blade 9, under the action of the airflow, causes the rotating shaft 8 to cooperate with the bracket 7 to rotate, thereby driving the first bevel gear 10 to cooperate with the second bevel gear 13 to make the first shaft 12 cooperate with the support frame 11 to rotate, thereby driving the disturbance blade 9 at the discharge joint 6 to rotate, disturbing the gas inside the reaction shell 1, and then the excess gas enters the storage box 3. Under the action of the air pressure generated during the operation of the induced draft fan 5, the excess gas in the storage box 3 quickly enters the preheating box 2 through the circulation pipe 16, and is transported to the reaction shell 1 again after preheating, which not only makes the gas distribution more uniform, and the single-walled carbon nanotubes in the reaction shell 1 grow more uniformly, but also increases the flow rate of the gas, which is beneficial to improving the production efficiency of the single-walled carbon nanotubes and increasing the output of the single-walled carbon nanotubes.

[0038] like Figure 3 , Figure 4 As shown, a second shaft 14 whose bottom end is rotatably connected to the reaction housing 1 is installed on both sides of the support frame 11, and a spoiler blade 15 is symmetrically installed on the outer wall of the second shaft 14 at an axial position, and a first bearing is installed on the bottom wall of the inner cavity of the reaction housing 1, and the first bearing is interference-connected with the bottom end of the second shaft 14;

[0039] It should be noted that, during the circulation of the airflow inside the reaction shell 1, the airflow acts on the spoiler blade 15, causing the second shaft 14 to rotate, so that the spoiler blade 15 and the disturbance blade 9 disperse and disturb the airflow inside the reaction shell 1 in two directions, which can further improve the distribution uniformity of the airflow inside the reaction shell 1.

[0040] like Figure 3 As shown, the rotating shaft 8 passes through the bracket 7, and a second bearing is installed at the junction of the bracket 7 and the rotating shaft 8;

[0041] It should be noted that the friction between the rotating shaft 8 and the bracket 7 can be reduced, and the rotation accuracy of the rotating shaft 8 is guaranteed.

[0042] like Figure 3 As shown, the first shaft 12 passes through the top of the support frame 11, and a third bearing is installed at the junction of the top of the support frame 11 and the first shaft 12;

[0043] It should be noted that the friction between the first shaft 12 and the support frame 11 is reduced, and the rotation accuracy of the first shaft 12 is guaranteed.

[0044] like Figure 1 As shown, a feed pipe 17 is installed on the outer wall of the preheating box 2 away from the reaction shell 1, and a discharge pipe 18 is installed on the outer wall of the storage box 3 away from the reaction shell 1, and stop valves are installed at both the feed pipe 17 and the discharge pipe 18;

[0045] It should be noted that the feed pipe 17 and the discharge pipe 18 can be used to realize the feeding and discharging of materials by opening the stop valve.

[0046] During use: first, the gas is passed into the gas preheating box 2 for preheating, and then the induced draft fan 5 is started to work, and the preheated gas is passed into the inner side of the reaction shell 1 through the discharge joint 6. When the gas passes through the discharge joint 6, the disturbance blade 9, under the action of the airflow, causes the rotating shaft 8 to cooperate with the bracket 7 to rotate, thereby driving the first bevel gear 10 to cooperate with the second bevel gear 13 to make the first shaft rod 12 cooperate with the support frame 11 to rotate, thereby driving the disturbance blade 9 at the discharge joint 6 to rotate, disturbing the gas inside the reaction shell 1, and then the excess gas enters the storage box 3. Under the action of the air pressure generated during the operation of the induced draft fan 5, the excess gas in the storage box 3 quickly enters the preheating box 2 through the circulation pipe 16, and is transported to the reaction shell 1 again after preheating.

[0047] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A fluidized bed reactor for producing single-walled carbon nanotubes, comprising a reaction shell (1) and a preheating box (2) and a material storage box (3) installed on both sides of the reaction shell (1), characterized in that: A feed connector (4) is conductively connected between the reaction housing (1) and the preheating box (2), and an induced draft fan (5) with an air outlet facing the reaction housing (1) is installed at the feed connector (4); A discharge joint (6) is conductively connected between the reaction housing (1) and the storage box (3); A bracket (7) is installed on the inner side of the end of the feed connector (4) and the discharge connector (6) close to the reaction shell (1); a rotating shaft (8) is rotatably connected to the bracket (7); a disturbance blade (9) is installed on the outer wall of the rotating shaft (8) located on the inner side of the reaction shell (1); and a first bevel gear (10) is installed on the end of the rotating shaft (8) away from the bracket (7); A support frame (11) is fixedly connected to the inner bottom wall of the reaction shell (1), a first shaft (12) is rotatably connected to the top of the support frame (11), and second bevel gears (13) meshing with the first bevel gear (10) are mounted on both ends of the first shaft (12); A circulation pipe (16) is conductively connected between the preheating box (2) and the material storage box (3).

2. A fluidized bed reactor for producing single-walled carbon nanotubes according to claim 1, characterized in that: Second shafts (14) whose bottom ends are rotatably connected to the reaction housing (1) are mounted on both sides of the support frame (11), and spoiler blades (15) are symmetrically mounted on the outer wall of the second shaft (14) at axial positions.

3. A fluidized bed reactor for producing single-walled carbon nanotubes according to claim 2, characterized in that: A first bearing is installed on the bottom wall of the inner cavity of the reaction housing (1), and the first bearing is interference-connected with the bottom end of the second shaft (14).

4. The fluidized bed reactor for producing single-walled carbon nanotubes according to claim 1, characterized in that: The rotating shaft (8) passes through the bracket (7), and a second bearing is installed at the junction of the bracket (7) and the rotating shaft (8).

5. The fluidized bed reactor for producing single-walled carbon nanotubes according to claim 1, characterized in that: The first shaft (12) passes through the top end of the support frame (11), and a third bearing is installed at the junction of the top end of the support frame (11) and the first shaft (12).

6. A fluidized bed reactor for producing single-walled carbon nanotubes according to claim 1, characterized in that: The preheating box (2) is provided with a feed pipe (17) at an outer wall away from the reaction shell (1), and the storage box (3) is provided with a discharge pipe (18) at an outer wall away from the reaction shell (1).

7. A fluidized bed reactor for producing single-walled carbon nanotubes according to claim 6, characterized in that: Stop valves are installed at both the feed pipe (17) and the discharge pipe (18).

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