Efficient waste heat recovery and heat conduction device of oxidation furnace for carbon fiber oxidation heating

Abstract

The utility model relates to the technical field of carbon fiber production, and discloses a high-efficiency waste heat recovery heat conduction device of an oxidation furnace for carbon fiber oxidation heating, which comprises a support underframe, and the upper surface of the support underframe is fixedly connected with a furnace body. Therefore, in the subsequent pre-oxidation process, heat energy needed by the carbon fiber precursors is reduced, waste heat recycling is achieved, the energy utilization rate is increased, energy waste is reduced, meanwhile, the metal heat conduction plate on the inner bottom wall of the containing frame can conduct heat to the lower surfaces of the carbon fiber precursors, and the carbon fiber precursors are prevented from being damaged. The fan is arranged above the ventilation slot and the ventilation slot is arranged above the heat exchange copper pipe, so that heat transfer can be accelerated, the preheating effect of the carbon fiber precursor can be quickly achieved, and the preheating efficiency of the carbon fiber precursor is improved. And the preheating process is optimized.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber production technology, and in particular to a high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace. Background Technology

[0002] The oxidation furnace in carbon fiber production is mainly used for pre-oxidation treatment of carbon fiber precursor. In this process, the non-carbon elements in the carbon fiber precursor react chemically with oxygen, causing changes in the structure of the precursor, thus laying the foundation for subsequent carbonization and other processes.

[0003] In traditional carbon fiber oxidation furnace systems, a large amount of heat energy is wasted due to the lack of effective waste heat recovery devices. Directly discharging waste heat means that more energy needs to be invested in the pre-oxidation process of carbon fiber. In the pre-oxidation stage of carbon fiber, the precursor fiber needs to reach a certain temperature. If the waste heat discharged from the oxidation furnace cannot be effectively utilized, it is necessary to rely on additional energy supply to meet this temperature requirement, which undoubtedly increases production costs and reduces the economic benefits of production. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace.

[0005] This utility model is achieved using the following technical solution: a high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace, comprising a supporting base frame, a furnace body fixedly connected to the upper surface of the supporting base frame, an exhaust port opened on the upper surface of the furnace body, a flow guiding and heat insulation pipe fixedly connected inside the exhaust port, a preheating box fixedly connected to the upper surface of the supporting base frame, a heat exchange copper tube fixedly connected to the inner wall of the preheating box, the flow guiding and heat insulation pipe fixedly connected to one end of the heat exchange copper tube, a placement frame provided on the inner bottom wall of the preheating box, and a metal heat conducting plate fixedly connected to the inner bottom wall of the placement frame.

[0006] By using the above technical solution, the carbon fiber precursor is preheated evenly, which reduces the heat energy required by the carbon fiber precursor during the subsequent pre-oxidation process, thus achieving energy saving.

[0007] As a further improvement to the above solution, an assembly box is fixedly connected to the upper surface of the preheating box, and a fan is fixedly installed on the inner wall of the assembly box by bolts.

[0008] The above technical solutions accelerate heat transfer, improve preheating efficiency, and enable carbon fiber precursors to achieve preheating effects more quickly, further optimizing the preheating process.

[0009] As a further improvement to the above solution, the surface of the preheating box is provided with ventilation slots, the fan is located above the ventilation slots, and the ventilation slots are located above the heat exchange copper tubes.

[0010] The above technical solution ensures that the air blown out by the fan can effectively act on the heat exchange copper tube and carbon fiber filament, thereby improving the working efficiency of the preheating device.

[0011] As a further improvement to the above solution, a pipe frame is fixedly connected to the surface of the flow-guiding and heat-insulating pipe, and the pipe frame is fixedly connected to the surface of the furnace body.

[0012] The above technical solutions stabilize the structure of the heat-insulating pipe, ensure the stability of waste heat transfer, and contribute to the normal operation of the entire waste heat recovery heat transfer device.

[0013] As a further improvement to the above solution, a discharge pipe is fixedly connected to the surface of the heat exchange copper tube, and a filter box is fixedly connected to the surface of the discharge pipe.

[0014] The above technical solution filters the hot gas after waste heat utilization, purifies the discharged gas, reduces environmental pollution, and also prevents impurities in the hot gas from damaging other equipment.

[0015] As a further improvement to the above solution, a filter screen assembly is slidably connected inside the filter box.

[0016] The above technical solutions facilitate the maintenance of the filter assembly, ensure the long-term effectiveness of the filter box, and extend its service life.

[0017] As a further improvement to the above solution, the surface of the filter box is provided with an exhaust groove, which is located behind the filter screen assembly.

[0018] As a further improvement to the above solution, the surface of the preheating box is hinged with a sealing door.

[0019] The above technical solution facilitates the placement and removal of carbon fiber precursors while ensuring the sealing of the preheating box, which helps to improve preheating efficiency and reduce heat loss.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention utilizes components such as a preheating box and heat exchange copper pipes to uniformly preheat carbon fiber precursors. This reduces the heat energy required by the carbon fiber precursors during subsequent pre-oxidation, enabling the recovery and reuse of waste heat, improving energy utilization efficiency, and reducing energy waste. Simultaneously, the metal heat-conducting plate on the bottom wall of the placement frame can conduct heat to the lower surface of the carbon fiber precursors, which, combined with the preheating of the upper surface of the carbon fiber precursors by the air inside the preheating box, ensures that both the upper and lower surfaces are preheated, thus guaranteeing uniform preheating. The fan is located above the ventilation slot, which is located above the heat exchange copper pipe, which accelerates heat transfer, allowing the carbon fiber precursors to achieve the preheating effect more quickly and optimizing the preheating process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the exhaust groove of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the heat exchange copper tube of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the fan of this utility model;

[0026] Figure 5 This is an exploded structural diagram of the filter assembly of this utility model.

[0027] Explanation of key symbols:

[0028] 1. Support frame; 2. Furnace body; 3. Exhaust port; 4. Insulation pipe; 5. Preheating box; 6. Heat exchange copper pipe; 7. Placement frame; 8. Metal heat-conducting plate; 9. Assembly box; 10. Fan; 11. Pipe rack; 12. Ventilation slot; 13. Exhaust pipe; 14. Filter box; 15. Filter screen assembly; 16. Exhaust slot; 17. Sealing door. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] Please combine Figure 1-5This embodiment discloses a high-efficiency waste heat recovery and heat conduction device for a carbon fiber oxidation furnace, comprising a supporting base 1, a furnace body 2 fixedly connected to the upper surface of the supporting base 1, an exhaust port 3 on the upper surface of the furnace body 2, a flow-guiding and heat-insulating pipe 4 fixedly connected inside the exhaust port 3, a preheating box 5 fixedly connected to the upper surface of the supporting base 1, a heat exchange copper pipe 6 fixedly connected to the inner wall of the preheating box 5, the flow-guiding and heat-insulating pipe 4 fixedly connected to one end of the heat exchange copper pipe 6, a placement frame 7 provided on the inner bottom wall of the preheating box 5, and a metal heat-conducting plate 8 fixedly connected to the inner bottom wall of the placement frame 7. When the valve inside the exhaust port 3 is opened, the waste heat generated by the furnace body 2 is recovered and the furnace body 2 is heated. Heat flows along the heat-insulating pipe 4. Since the heat-insulating pipe 4 is fixedly connected to one end of the heat exchange copper pipe 6, the residual heat enters the interior of the heat exchange copper pipe 6. The heat exchange copper pipe 6 is located inside the preheating box 5. The heat transfer causes the temperature inside the preheating box 5 to rise. The placement frame 7 is placed on the bottom wall of the preheating box 5, and carbon fiber filaments are placed on its surface. The temperature rise of the preheating box 5 preheats the carbon fiber filaments. At the same time, the metal heat-conducting plate 8 on the bottom wall of the placement frame 7 can conduct heat to the lower surface of the carbon fiber filaments. This, combined with the preheating of the upper surface of the carbon fiber filaments by the air inside the preheating box 5, ensures that both the upper and lower surfaces are preheated, thereby ensuring the uniformity of preheating.

[0031] An assembly box 9 is fixedly connected to the upper surface of the preheating box 5. A fan 10 is fixedly installed on the inner wall of the assembly box 9 by bolts. The fan 10, which is fixedly installed in the assembly box 9 by bolts, starts to work. The air blown out by the fan 10 blows the heat on the surface of the heat exchange copper tube 6 downwards, accelerating the heat transfer to the carbon fiber filament, thereby preheating the carbon fiber filament inside the placement frame 7.

[0032] The surface of the preheating box 5 is provided with ventilation slots 12, and the fan 10 is located above the ventilation slots 12. The ventilation slots 12 are located above the heat exchange copper tubes 6. The ventilation slots 12 provide a channel for the flow of air, so that the air blown out by the fan 10 can reach the target area smoothly and achieve the preheating of the carbon fiber filament.

[0033] A pipe rack 11 is fixedly connected to the surface of the heat-insulating pipe 4. The pipe rack 11 is fixedly connected to the surface of the furnace body 2. The pipe rack 11 ensures the stability of the position of the heat-insulating pipe 4, prevents the heat-insulating pipe 4 from shaking or shifting, and ensures that the residual heat can be smoothly transferred from the furnace body 2 to the heat exchange copper pipe 6 through the heat-insulating pipe 4.

[0034] A discharge pipe 13 is fixedly connected to the surface of the heat exchange copper tube 6, and a filter box 14 is fixedly connected to the surface of the discharge pipe 13. After the waste heat in the heat exchange copper tube 6 is used up, the hot air enters the filter box 14 through the discharge pipe 13 to prevent impurities in the hot air from causing adverse effects on the environment or other equipment.

[0035] The filter box 14 has a filter screen assembly 15 that is slidably connected inside. Since the filter screen assembly 15 is slidably connected inside the filter box 14, it is easy to install, disassemble and replace the filter screen assembly 15. When the filter screen assembly 15 has accumulated a lot of impurities after a period of use, it can be easily removed for cleaning or replacement to ensure the filtration effect.

[0036] The surface of the filter box 14 is provided with an exhaust groove 16, which is located behind the filter screen assembly 15. The hot air filtered by the filter screen assembly 15 is discharged from the filter box 14 through the exhaust groove 16. The exhaust groove 16 is located behind the filter screen assembly 15. This layout ensures that the hot air can be smoothly discharged from the filter box 14 after being filtered by the filter screen assembly 15.

[0037] The surface of the preheating box 5 is hinged with a sealing door 17. When it is necessary to put or take out the carbon fiber filament into the placement frame 7, the sealing door 17 can be opened for operation. After the operation is completed, the sealing door 17 is closed to ensure the sealing of the preheating box 5 and prevent heat loss.

[0038] The implementation principle of the high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace in this application embodiment is as follows: Open the sealing door 17 on the surface of the preheating box 5, and neatly place the next batch of carbon fiber filaments to be processed in the placement frame 7, ensuring that the carbon fiber filaments are evenly distributed on the surface of the placement frame 7. Then close the sealing door 17 to ensure the sealing of the preheating box 5. Open the valve inside the exhaust port 3 of the furnace body 2, and the waste heat generated by the furnace body 2 begins to flow along the guide insulation pipe 4. Since the guide insulation pipe 4 is stably supported and fixed by the pipe frame 11, the waste heat can smoothly enter the heat exchange copper pipe 6 connected to it through the guide insulation pipe 4. As the waste heat enters the heat exchange copper pipe 6, which is located inside the preheating box 5, the heat begins to be transferred to the air inside the preheating box 5, causing the temperature inside the preheating box 5 to gradually rise. The placement frame 7 is located on the bottom wall inside the preheating box 5, and the carbon fiber filaments on the surface of the placement frame 7 begin to be preheated by the hot air inside the preheating box 5. At the same time, the metal heat conduction plate on the bottom wall of the placement frame 7... 8. Heat is transferred to the lower surface of the carbon fiber precursor to achieve uniform preheating of the upper and lower surfaces of the carbon fiber precursor. The fan 10 in the assembly box 9 is started. Since the surface of the preheating box 5 has ventilation slots 12 and the fan 10 is located above the ventilation slots 12, which are located above the heat exchange copper tubes 6, the air blown by the fan 10 blows the heat on the surface of the heat exchange copper tubes 6 downwards, accelerating the transfer of heat to the carbon fiber precursor in the placement frame 7, and further improving the preheating efficiency. After the residual heat in the heat exchange copper tubes 6 is used up, the hot air enters the filter box 14 through the exhaust pipe 13. After the hot air enters the filter box 14, the internally sliding filter screen group 15 filters the impurities in the hot air. The hot air filtered by the filter screen group 15 is discharged from the filter box 14 through the exhaust slot 16 located behind the filter screen group 15. When the preheating meets the requirements, the residual heat supply of the furnace body 2 is stopped, the fan 10 is stopped, the sealing door 17 of the preheating box 5 is opened, and the preheated carbon fiber precursor is taken out from the placement frame 7, completing the entire operation process.

[0039] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A high-efficiency waste heat recovery and heat transfer device for carbon fiber oxidation heating furnace, characterized in that, include: A support base (1) is provided, and a furnace body (2) is fixedly connected to the upper surface of the support base (1). An exhaust port (3) is provided on the upper surface of the furnace body (2). A flow-guiding and heat-insulating pipe (4) is fixedly connected inside the exhaust port (3). A preheating box (5) is fixedly connected to the upper surface of the support base (1). A heat exchange copper pipe (6) is fixedly connected to the inner wall of the preheating box (5). The flow-guiding and heat-insulating pipe (4) is fixedly connected to one end of the heat exchange copper pipe (6). A placement frame (7) is provided on the inner bottom wall of the preheating box (5). A metal heat-conducting plate (8) is fixedly connected to the inner bottom wall of the placement frame (7).

2. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 1, characterized in that, An assembly box (9) is fixedly connected to the upper surface of the preheating box (5), and a fan (10) is fixedly installed on the inner wall of the assembly box (9) by bolts.

3. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 2, characterized in that, The surface of the preheating box (5) is provided with ventilation slots (12), the fan (10) is located above the ventilation slots (12), and the ventilation slots (12) are located above the heat exchange copper tubes (6).

4. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 1, characterized in that, The surface of the flow-guiding and heat-insulating pipe (4) is fixedly connected to a pipe rack (11), which is fixedly connected to the surface of the furnace body (2).

5. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 1, characterized in that, A discharge pipe (13) is fixedly connected to the surface of the heat exchange copper tube (6), and a filter box (14) is fixedly connected to the surface of the discharge pipe (13).

6. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 5, characterized in that, The filter box (14) is internally connected to a filter screen assembly (15).

7. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 5, characterized in that, The surface of the filter box (14) is provided with an exhaust groove (16), which is located behind the filter assembly (15).

8. The high-efficiency waste heat recovery and heat conduction device for carbon fiber oxidation heating furnace as described in claim 1, characterized in that, The surface of the preheating box (5) is hinged with a sealing door (17).

Images