Graphitization furnace with waste heat recovery function

Abstract

The invention discloses a graphitization furnace with a waste heat recovery function, and relates to the technical field of graphitization furnaces, the graphitization furnace comprises a furnace body, a feed hopper is connected above the furnace body, an upper electrode extending into the furnace body is fixedly arranged in the feed hopper, a lower electrode is arranged on the inner wall surface of the lower part of the furnace body, the bottom of the furnace body is connected with a transition cylinder, and the bottom of the transition cylinder is connected with a cooling box; the thickness of the cooling box is smaller than the height and width of the cooling box, a preheating box is fixedly arranged on the outer side of the cooling box, a channel for materials to flow is reserved between the preheating box and the cooling box, a second conveying screw is arranged at the bottom of the preheating box, the discharging end of the second conveying screw is connected with an elevator, and the discharging end of the elevator is connected with a feeding hopper through an inclined pipe. According to the invention, heat dissipated during material cooling can be utilized to preheat materials before entering the furnace body, and meanwhile, the heat dissipation effect during material cooling is improved.

Description

Technical Field

[0001] The invention relates to the technical field of graphitization furnaces, in particular to a graphitization furnace with a waste heat recovery function. Background Art

[0002] The continuous graphitization furnace is a furnace that produces graphitized products in a continuous output mode. Although the Acheson furnace is widely used, it is an intermittent furnace for periodic production. Due to the discontinuous production, it brings disadvantages such as low production capacity, quality fluctuations, high power consumption, and harsh operating environment. Therefore, the continuous furnace has become an important topic and goal of research and development that the world pays attention to; For example, the invention patent with announcement number CN115355705A discloses a vertical graphitization furnace, which includes a support plate, a furnace body and a furnace cover; a positive electrode is arranged in the middle of the arc dome of the furnace cover and penetrates into the furnace body; the lower part of the positive electrode to the surface of the material in the furnace body is the preheating zone. A negative electrode is arranged opposite to the positive electrode at the bottom center of the furnace body, and a furnace core area is formed between the positive electrode and the negative electrode to heat the material; the outside of the furnace core area is surrounded by the same material to form a heat preservation area, and a main material discharge pipe is connected to the lower part of the negative electrode, a main material cooling water jacket is mounted on the main material discharge pipe, and a main material discharge device is connected to the end of the main material discharge pipe to discharge the main material; a cooling water jacket is arranged at the lower part of the furnace lining, and a cooling area is formed at the lower part of the furnace lining; a side material discharge port surrounding the negative electrode is arrayed at the bottom of the furnace body, a side material discharge pipe is connected to the lower part of the side material discharge port, a side material cooling water jacket is mounted on the side material discharge pipe, and a side material discharge device is connected to the end of the side material discharge pipe to discharge the side material; However, the invention does not reasonably utilize the heat generated when the material is cooled, resulting in heat waste. At the same time, the heat dissipation area with a circular cross-section is not conducive to the heat dissipation of the material at the center, and the efficiency is low. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a graphitization furnace with a waste heat recovery function, which realizes preheating of the material before entering the furnace body by utilizing the heat emitted when the material is cooled, while improving the heat dissipation effect when the material is cooled.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A graphitization furnace with waste heat recovery function, comprising a furnace body, a feed hopper connected to the top of the furnace body, an upper electrode extending into the furnace body fixedly arranged in the feed hopper, an insulation layer provided on the inner wall of the furnace body, a lower electrode provided on the inner wall below the furnace body, a transition tube connected to the bottom of the furnace body, a cooling box connected to the bottom of the transition tube, the thickness of the cooling box is less than its height and width, a first conveying screw is installed at the bottom of the cooling box, a discharge port is provided at the discharge end of the first conveying screw, a preheating box is fixedly arranged on the outside of the cooling box, a channel for material flow is reserved between the preheating box and the cooling box, a second conveying screw is provided at the bottom of the preheating box, a hoist is connected to the discharge end of the second conveying screw, the discharge end of the hoist is connected to the feed hopper through an inclined pipe, a raw material hopper is connected to the top of the preheating box, and a flow regulating mechanism capable of covering the cross section thereof is provided at the bottom of the cooling box and located above the first conveying screw and at the bottom of the preheating box and located above the second conveying screw.

[0005] Preferably, the flow regulating mechanism includes an installation cavity, which is provided with openings on both the upper and lower sides, a rotating shaft is rotatably arranged in the installation cavity, and no less than three blades are fixedly arranged on the side wall of the rotating shaft, and the other end of the blade can contact the side wall of the installation cavity, and the end of the rotating shaft close to the discharge port is connected to a motor.

[0006] Preferably, a plurality of partitions are evenly arranged in the cooling box, and a plurality of vertical channels of equal size can be formed by the plurality of partitions.

[0007] Preferably, an eight-shaped guide plate is fixedly provided in the transition tube.

[0008] The present invention provides a graphitization furnace with a waste heat recovery function, which has the following beneficial effects: the device can switch the material from a circular cross-section to a rectangular cross-section through a transition tube. Since the cross-section of the cooling box is a flat rectangle, when the heated material is in the cooling box, its thickness becomes thinner, which is more conducive to the dissipation of its heat and avoids the poor heat dissipation effect of the material at the center of the circular cross-section; the partitions arranged in the cooling box can avoid the oblique flow of the material in the cooling box, reduce the flow dead angle in the cooling box, and ensure the uniformity of heat dissipation in various parts of the cooling box; by arranging a preheating box on the outside of the cooling box, the material before entering the furnace body can be preheated, which reduces the energy consumption of the furnace body and changes the traditional waste heat recovery system that needs to use a heat exchange medium for heat exchange. The cooling box can be cooled by the material continuously flowing into the preheating box, and the preheating box can be heated by the material continuously flowing into the cooling box. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the main view of the internal structure of the present invention; Figure 2 It is a side view of the internal structure of the present invention; Figure 3 for Figure 2 A partial enlarged view of middle A.

[0010] In the figure: 1. furnace body; 2. feed hopper; 3. insulation layer; 4. upper electrode; 5. lower electrode; 6. transition tube; 7. cooling box; 8. first conveying screw; 9. discharge port; 10. preheating box; 11. second conveying screw; 12. elevator; 13. inclined pipe; 14. raw material hopper; 15. partition; 16. installation cavity; 17. rotating shaft; 18. blades; 19. motor; 20. guide plate. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0012] See also Figure 1-Figure 3The present invention provides a technical solution: a graphitization furnace with waste heat recovery function, comprising a furnace body 1, a feed hopper 2 is connected above the furnace body 1, an upper electrode 4 extending into the furnace body 1 is fixedly arranged in the feed hopper 2, an inner wall surface of the furnace body 1 is provided with a heat preservation layer 3, and a lower electrode 5 is arranged on the inner wall surface below the furnace body 1, and the material in the furnace body is heated by energizing the upper electrode 4 and the lower electrode 5, a transition tube 6 is connected to the bottom of the furnace body 1, and a cooling box 7 is connected to the bottom of the transition tube 6, and the cooling box 7 is made of a material that can transfer heat to ensure that the heat in the cooling box 7 can be transferred outward, and the thickness of the cooling box 7 is less than its height and width, so that the cross-section of the cooling box 7 is a flat rectangle, the upper port of the transition tube 6 is circular and matches the bottom of the furnace body 1, and the lower port of the transition tube 6 is rectangular and matches the upper port of the cooling box 7, and the material can be switched from a circular cross-section to a rectangular cross-section through the transition tube 6, and a first conveying screw 8 is installed at the bottom of the cooling box 7, and the discharge end of the first conveying screw 8 is provided with A discharge port 9 is provided, through which the material in the cooling box 7 can be discharged through the discharge port 9 through the first conveying screw 8. A preheating box 10 is fixedly arranged on the outside of the cooling box 7. A channel for material flow is reserved between the preheating box 10 and the cooling box 7. When the material is in the channel, it can be heated by the heat emitted by the cooling box 7. A second conveying screw 11 is provided at the bottom of the preheating box 10. The discharge end of the second conveying screw 11 is connected to an elevator 12. The discharge end of the elevator 12 is connected to the feed hopper 2 through an inclined pipe 13, so that the heated material can be transported to the furnace body 1. A raw material hopper 14 is connected above the preheating box 10 for storing the material to be preheated. A flow regulating mechanism that can cover the cross section of the cooling box 7 and is located above the first conveying screw 8 and the bottom of the preheating box 10 and is located above the second conveying screw 11 is provided. The flow regulating mechanism can control the flow of the material so that the material in the cooling box 7 can flow downward at the same time to avoid the formation of a flow dead angle.

[0013] As an embodiment of the present invention, the flow regulating mechanism includes an installation cavity 16, which has openings on both the upper and lower sides. A rotating shaft 17 is rotatably arranged in the installation cavity 16, and no less than three blades 18 are fixedly arranged on the side wall of the rotating shaft 17. When the rotating shaft 17 rotates, at least two of the three blades 18 can be in the installation cavity 16 outside the opening, and the other end of the blade 18 can contact the side wall of the installation cavity 16. A motor 19 is connected to one end of the rotating shaft 17 close to the discharge port 9. Starting the motor 19 can drive the rotating shaft 17 to rotate, and a temporary storage cavity of fixed capacity is formed between the two blades 18. When the temporary storage cavity is aligned with the upper opening, the material can flow into it, and when the temporary storage cavity is aligned with the lower opening, the material can flow downward, and the flow rate of the material is controlled by controlling the rotation speed of the motor 19.

[0014] As an embodiment of the present invention, a plurality of partitions 15 are evenly arranged in the cooling box 7, and a plurality of vertical channels of equal size can be formed through the plurality of partitions 15. The vertical channels can prevent the material from flowing obliquely in the cooling box, further reduce the flow dead angles in the cooling box 7, and ensure the uniformity of heat dissipation in various parts of the cooling box 7.

[0015] As an embodiment of the present invention, an eight-shaped guide plate 20 is fixedly provided in the transition tube 6. The eight-shaped guide plate 20 can facilitate guiding the material to the two ends of the rectangular cross-section when the material changes from a circular cross-section to a rectangular cross-section, thereby further improving the uniformity of material flow.

[0016] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and no longer explains the electrical control.

[0017] The working principle and use process of the present invention are as follows: the material in the furnace body 1 is heated by energizing the upper electrode 4 and the lower electrode 5, and the heated material can enter the cooling box 7 through the transition tube 6. Since the cross section of the cooling box 7 is a flat rectangle, when the material with temperature is in the cooling box 7, its thickness becomes thinner, which is more conducive to the heat dissipation, and at the same time avoids the poor heat dissipation effect of the material at the center of the circular cross section. By starting the first conveying screw 8, the material can be discharged through the discharge port 9, and the flow regulating mechanism can make the material in the cooling box 7 flow downward at the same time, and the partition 15 set in the cooling box 7 can be Avoid oblique flow of materials in the cooling box 7, reduce the flow dead angle in the cooling box 7, ensure the uniformity of heat dissipation in various parts of the cooling box 7, and pour the materials into the raw material hopper 14. After that, they can automatically flow into the preheating box 10 by their own weight, and preheat the materials by the heat emitted by the heat dissipation box 7. Start the second conveying screw 11 to convey the preheated materials in the preheating box 10 to the elevator 12, and convey the materials to the furnace body 1 through the elevator 12. By arranging a flow regulating mechanism above the second conveying screw 11, the materials in the preheating box 10 can flow downward at the same time, avoiding the generation of flow dead angles in the preheating box 10.

[0018] The elevator 12 used in the present invention is all existing conventional technology, and its specific structure will not be described in detail.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A graphitization furnace with waste heat recovery function, characterized in that: The invention comprises a furnace body (1), wherein a feed hopper (2) is connected to the top of the furnace body (1), an upper electrode (4) extending into the furnace body (1) is fixedly arranged in the feed hopper (2), an inner wall surface of the furnace body (1) is provided with a heat-insulating layer (3), a lower electrode (5) is arranged on the inner wall surface below the furnace body (1), a transition tube (6) is connected to the bottom of the furnace body (1), a cooling box (7) is connected to the bottom of the transition tube (6), the thickness of the cooling box (7) is smaller than the height and width thereof, a first conveying screw (8) is installed at the bottom of the cooling box (7), a discharge port (9) is provided at the discharge end of the first conveying screw (8), and a cooling box (7) is fixedly arranged on the outside of the cooling box (7). A preheating box (10) is provided, a passage for material flow is reserved between the preheating box (10) and the cooling box (7), a second conveying screw (11) is arranged at the bottom of the preheating box (10), a discharge end of the second conveying screw (11) is connected to an elevator (12), a discharge end of the elevator (12) is connected to the feed hopper (2) through an inclined pipe (13), a raw material hopper (14) is connected above the preheating box (10), and a flow regulating mechanism capable of covering the cross section is provided at the bottom of the cooling box (7) and located above the first conveying screw (8) and at the bottom of the preheating box (10) and located above the second conveying screw (11).

2. The graphitization furnace with waste heat recovery function according to claim 1, characterized in that: The flow regulating mechanism comprises an installation cavity (16), the installation cavity (16) is provided with openings on both upper and lower sides, a rotating shaft (17) is rotatably arranged in the installation cavity (16), and no less than three blades (18) are fixedly arranged on the side wall of the rotating shaft (17), and the other end of the blade (18) can contact the side wall of the installation cavity (16), and one end of the rotating shaft (17) close to the discharge port (9) is connected to a motor (19).

3. The graphitization furnace with waste heat recovery function according to claim 1, characterized in that: A plurality of partitions (15) are evenly arranged in the cooling box (7), and a plurality of vertical channels of equal size can be formed by the plurality of partitions (15).

4. The graphitization furnace with waste heat recovery function according to claim 3, characterized in that: An eight-shaped guide plate (20) is fixedly arranged inside the transition tube (6).

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