Carbonization reaction furnace for preparing carbon nanotubes by carbonizing waste plastics

Abstract

The utility model discloses a carbonization reaction furnace for preparing carbon nanotubes by carbonizing waste plastics. The carbonization reaction furnace comprises a carbonization bin and a catalysis bin which are communicated with each other, the device further comprises a pretreatment assembly and an air inlet pipe. A pretreatment assembly; comprising a pretreatment box, and the pretreatment box is provided with a feeding pipe and a discharging pipe; a magnetic separation structure and a winnowing structure are arranged in the pretreatment box; the air inlet pipe is communicated with the upper end of the carbonization bin and is connected with an air pump. According to the utility model, the magnetic separation mechanism and the winnowing mechanism are integrated above the carbonization furnace, so that the conveying process is reduced, impurity pretreatment is realized, and the integration degree is high.

Description

Technical Field

[0001] This utility model relates to the field of industrial production technology, specifically to a carbonization reactor for preparing carbon nanotubes from carbonized waste plastics. Background Technology

[0002] Carbon nanotubes are nanomaterials with unique structures and excellent properties. They can be used to manufacture high-performance transistors with advantages such as high switching speed and low power consumption. Adding carbon nanotubes to polymer composites can significantly improve the mechanical properties, electrical conductivity, and thermal conductivity of the composites. Carbon nanotubes can also be used as electrode materials for lithium-ion batteries and supercapacitors, making them a highly promising material.

[0003] In existing technologies, carbonization involves placing cleaned and dried waste plastics into a carbonization furnace, where a carbonization reaction occurs under high temperature and with the aid of a catalyst. During this process, the organic matter in the plastics is decomposed, generating carbon nanotubes and other volatile products. However, in practice, many impurities in waste plastics are difficult to remove during the cleaning and drying process. These impurities can negatively impact the quality and performance of carbon nanotubes in various ways. These impurities include metal residues, organic additives, and contaminant particles, which reduce the purity and structural integrity of the carbon nanotubes, indicating room for improvement. Utility Model Content

[0004] This invention aims to solve the technical problem that various impurities in waste plastics have a multifaceted negative impact on the quality and performance of carbon nanotubes, and provides a carbonization reactor for preparing carbon nanotubes from waste plastics.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a carbonization reactor for preparing carbon nanotubes by carbonizing waste plastics, comprising a carbonization chamber and a catalytic chamber connected together; both the carbonization chamber and the catalytic chamber are provided with protective shells on their outer sides, and the end of the carbonization chamber away from the catalytic chamber is provided with a feed inlet; further comprising:

[0006] A pretreatment assembly includes a pretreatment box, wherein a feed pipe is provided on one side and near the top of the pretreatment box, and a discharge pipe connected to the feed inlet is provided at the lower end of the other side; the pretreatment box is equipped with a magnetic separation structure and an air separation structure.

[0007] An air intake pipe is connected to the upper end of the carbonization chamber, and an air pump is connected to the air intake pipe.

[0008] Furthermore, a burner is connected to the front of the carbonization chamber, and a blower is connected to the burner.

[0009] Furthermore, the magnetic separation structure includes a drive box on the pretreatment box, a motor on the drive box, a main shaft extending from the output end of the motor into the drive box and the pretreatment box, and a drive gear located outside the main shaft and inside the drive box.

[0010] The drive box is equipped with multiple secondary shafts that extend into the pretreatment box. Each secondary shaft has a driven gear that can mesh with the drive gear on its outer side. The main shaft and secondary shafts are each fixed with several fixed rings from top to bottom on their outer sides. Each fixed ring has a corresponding magnetic strip on its outer side.

[0011] Furthermore, the directions of the magnetic strips are all different.

[0012] Furthermore, the internal space of the pretreatment box is cylindrical.

[0013] Furthermore, the air separation structure includes several branch pipes connected to the right side of the pretreatment box, the branch pipes being connected to an air duct, and the air duct being connected to an external fan;

[0014] A collection box is provided on the side of the pretreatment box away from the branch pipe, and a grid plate is provided between the collection box and the pretreatment box; an inclined grid plate is provided inside the collection box, and a collection box is connected below the collection box.

[0015] Furthermore, a baffle plate is provided inside the pretreatment box and below the feed pipe, and the baffle plate is provided with baffles.

[0016] The advantages of this utility model compared with the prior art are as follows:

[0017] It can remove metal impurities contained in waste plastic raw materials through magnetic separation structure, which can avoid reducing the purity, mechanical properties and subsequent growth of carbon nanotube products in the catalytic process.

[0018] By using an air separation structure to remove tiny particulate impurities from waste plastic raw materials, it is possible to avoid affecting the thermal stability and electrical properties of carbon nanotubes.

[0019] The magnetic separation mechanism and the air separation mechanism are integrated above the carbonization furnace, reducing the conveying process, avoiding the addition of new particulate impurities during long-distance conveying, and achieving structural integration. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of the pretreatment box of this utility model.

[0022] Figure 3 This is a schematic diagram of the magnetic separation structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the magnetic strip structure of this utility model.

[0024] As shown in the figure: 1. Carbonization chamber, 2. Catalytic chamber, 3. Burner, 4. Feed inlet, 5. Pretreatment box, 6. Feed pipe, 7. Discharge pipe, 8. Drive box, 9. Motor, 10. Main shaft, 11. Drive gear, 12. Countershaft, 13. Driven gear, 14. Fixed ring, 15. Magnetic strip, 16. Branch pipe, 17. Air duct, 18. Collection box, 19. Mesh plate, 20. Grille plate, 21. Collection box, 22. Baffle plate, 23. Baffle strip, 24. Air inlet pipe, 25. Air pump. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] Example 1, in conjunction with Appendix Figure 1 A carbonization reactor for preparing carbon nanotubes from waste plastics includes a carbonization chamber 1 and a catalytic chamber 2 connected together. Both the carbonization chamber 1 and the catalytic chamber 2 are equipped with protective shells for heat preservation. A feed inlet 4 is located at the end of the carbonization chamber 1 furthest from the catalytic chamber 2. The carbonization chamber 1 performs pyrolysis. A burner 3 is connected to the front of the carbonization chamber 1, and a blower is connected to the burner 3. After the raw material is placed in, the blower and burner 3 heat the interior to 600-900℃, causing the plastic to pyrolyze into carbon-containing gas. The catalytic chamber is used for catalytic growth; a catalyst is added to the carbon-containing gas generated by pyrolysis, and carbon nanotubes grow on the surface of the catalyst.

[0027] Based on the above structure, it also includes an air inlet pipe 24; connected to the upper end of the carbonization chamber 1, and an air pump 25 is connected to the air inlet pipe 24; the air inlet pipe 24 pumps inert gas such as argon into the carbonization chamber 1 through the air pump 25 for heating and protection.

[0028] Combined with appendix Figure 1 , 2 It also includes a pretreatment component; including a pretreatment box 5, the internal space of which is cylindrical to facilitate the rotation of the subsequent magnetic separation component; a feed pipe 6 is provided on one side and near the top of the pretreatment box 5, and a discharge pipe 7 connected to the feed port 4 is provided at the lower end of the other side;

[0029] A baffle 22 is provided inside the pretreatment box 5 and below the feed pipe 6. The baffle 22 is provided with baffles 23, and the side of the baffles 23 near the feed pipe 6 is arc-shaped. The baffles 23 and the baffle 22 can slow down the falling speed of the raw materials and disperse them, which facilitates subsequent air classification and reduces dead corners and omissions.

[0030] Combined with appendix Figure 2 , 3 4. The pretreatment box 5 is equipped with a magnetic separation structure and an air separation structure; specifically:

[0031] The magnetic separation structure includes a drive box 8 on the pretreatment box 5, a motor 9 on the drive box 8, a main shaft 10 extending into the drive box 8 and the pretreatment box 5, and a drive gear 11 located outside the main shaft 10 and inside the drive box 8.

[0032] The drive box 8 is equipped with multiple secondary shafts 12 that extend into the pretreatment box 5. Each secondary shaft 12 has a driven gear 13 that can mesh with the drive gear 11 on its outer side. The main shaft 10 and the secondary shaft 12 are each fixedly connected to a number of fixed rings 14 from top to bottom on their outer sides. Each fixed ring 14 has a corresponding magnetic strip 15 on its outer side.

[0033] In the above structure, when the motor 9 drives the main shaft 10 to rotate, it can drive multiple secondary shafts to rotate through the driving gear 11 and the driven gear 13, so that several magnetic strips 15 can agitate the plastic particles and adsorb the metal impurities in them during the agitation process; the magnetic strip 15 is a cylindrical support rod coated with magnetic material on the outside; the magnetic strips 15 are all in different directions, which can improve the agitation effect and reduce omissions and dead zones;

[0034] The air separation structure includes several branch pipes 16 connected to the right side of the pretreatment box 5. The branch pipes 16 are connected to an air duct 17, which is connected to an external fan. The multiple branch pipes 16 enable air intake at different heights, thereby improving the area and uniformity of the air intake coverage.

[0035] Based on the above structure, a collection box 18 is provided on the side of the pretreatment box 5 away from the branch pipe 16, and a grid plate 19 is provided between the collection box 18 and the pretreatment box 5; an inclined grid plate 20 is provided inside the collection box 18, and a collection box 21 is connected to the bottom of the collection box 18; thus, in the falling plastic particles, tiny impurities can be blown into the collection box 18 and adhere to the grid plate 20. After accumulating to a certain extent, they will fall into the collection box 21 by gravity, thus achieving collection.

[0036] In addition, the mesh size of the grid plate 19 should be set smaller than the average size of the plastic particles to prevent plastic particles from entering; in actual use, the air volume of the branch pipe 16 should be adjusted according to the actual situation so that it can only blow away tiny impurity particles smaller than plastic particles.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A carbonization reactor for preparing carbon nanotubes from waste plastics, comprising a connected carbonization chamber (1) and a catalytic chamber (2); characterized in that: Both the carbonization chamber (1) and the catalytic chamber (2) are provided with protective shells on their outer sides, and the carbonization chamber (1) is provided with a feed inlet (4) at the end away from the catalytic chamber (2); it also includes: Pretreatment assembly; including a pretreatment box (5), wherein a feed pipe (6) is provided on one side and near the upper end of the pretreatment box (5), and a discharge pipe (7) connected to the feed inlet (4) is provided at the lower end of the other side; the pretreatment box (5) is provided with a magnetic separation structure and an air separation structure; An air inlet pipe (24) is connected to the upper end of the carbonization chamber (1), and an air pump (25) is connected to the air inlet pipe (24).

2. The carbonization reactor for preparing carbon nanotubes from waste plastics according to claim 1, characterized in that: The front of the carbonization chamber (1) is connected to a burner (3), and the burner (3) is connected to a blower.

3. The carbonization reactor for preparing carbon nanotubes from waste plastics according to claim 1, characterized in that: The magnetic separation structure includes a drive box (8) provided on the pretreatment box (5), a motor (9) provided on the drive box (8), the output end of the motor (9) extending into the drive box (8) and the pretreatment box (5) and a main shaft (10) provided thereon, and a drive gear (11) provided outside the main shaft (10) and inside the drive box (8); The drive box (8) is rotatably provided with a plurality of secondary shafts (12) extending into the pretreatment box (5). Each secondary shaft (12) is provided with a driven gear (13) that can mesh with the drive gear (11) on its outer side. The main shaft (10) and the secondary shaft (12) are each fixedly connected with a plurality of fixing rings (14) from top to bottom on their outer sides. Each fixing ring (14) is provided with a corresponding magnetic strip (15) on its outer side.

4. The carbonization reactor for preparing carbon nanotubes from waste plastics according to claim 3, characterized in that: The magnetic strips (15) are all in different directions.

5. The carbonization reactor for preparing carbon nanotubes from waste plastics according to claim 3, characterized in that: The pretreatment box (5) has a cylindrical internal space.

6. The carbonization reactor for preparing carbon nanotubes from carbonized waste plastics according to claim 1, characterized in that: The air separation structure includes several branch pipes (16) connected to the right side of the pretreatment box (5), and the branch pipes (16) are connected to an air duct (17), which is connected to an external fan. A collection box (18) is provided on the side of the pretreatment box (5) away from the branch pipe (16), and a grid plate (19) is provided between the collection box (18) and the pretreatment box (5); an inclined grid plate (20) is provided inside the collection box (18), and a collection box (21) is connected to the bottom of the collection box (18).

7. The carbonization reactor for preparing carbon nanotubes from waste plastics according to claim 1, characterized in that: The pretreatment box (5) is equipped with a baffle (22) below the feed pipe (6), and the baffle (22) is equipped with a baffle (23).

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