Carbon fiber low temperature carbonization furnace

Abstract

The present invention provides a carbon fiber low-temperature carbonization furnace, including a carbonization furnace body, wherein the carbonization furnace body has a tow running channel along the running direction of the tow, and an adsorption transport carrier is provided between the tow and the top wall of the carbonization furnace body, and the adsorption transport carrier can circulate inside and outside the furnace cavity of the carbonization furnace body. According to a carbon fiber low-temperature carbonization furnace of the present invention, an adsorption transport carrier is used to adsorb particles that may produce deposits, such as carbon powder formed during the carbonization process, and the synchronous transfer and transportation of the deposits in the furnace can be achieved while the tow is carbonized, effectively reducing the probability of the particles in the furnace being deposited on the top wall of the furnace body of the carbonization furnace, greatly reducing the difficulty of cleaning the deposits on the top of the furnace, and extending the service life of the furnace to the greatest extent.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber production and manufacturing, and particularly relates to a carbon fiber low-temperature carbonization furnace. Background Art

[0002] During the carbon fiber production process, the pre-oxidized fiber undergoes thermal decomposition reaction in the carbon fiber low-temperature carbonization furnace, producing a large amount of waste gas, tar and carbon powder. As the production time goes by, the waste gas enters the incinerator for incineration under the action of the exhaust fan. However, under the action of tar, the carbon powder will gather on the inner wall of the carbon fiber low-temperature carbonization furnace, especially on the top of the furnace to form deposits. When this part of the deposit reaches a certain thickness, on the one hand, it will affect the uniformity of the original temperature field in the furnace, and on the other hand, if it falls off, it will adhere to the surface of the running tow and cause fiber defects. In the prior art, the cleaning of waste solids in the exhaust gas pipe of the carbonization furnace has attracted widespread attention. However, the cleaning of the carbonization furnace, especially the inner wall of the furnace, is currently mostly achieved by a more traditional cleaning method. For example, an iron rake is used to clean the furnace when the carbonization furnace is stopped. This will cause the following problems: First, due to the long length of the carbon fiber low-temperature carbonization furnace, there are many dead zones that are difficult to clean, which consumes a lot of manpower and material resources but the cleaning effect is not ideal; Second, repeatedly scraping the furnace wall during furnace cleaning greatly reduces the service life of the furnace. Based on the above-mentioned deficiencies in the prior art, the present invention is proposed. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a low-temperature carbonization furnace for carbon fibers, which uses an adsorption and transportation carrier to adsorb particles such as carbon powder formed during the carbonization process that may produce deposits, and can achieve synchronous transfer and transportation of deposits in the furnace while the filament bundle is carbonized, effectively reducing the probability of particles in the furnace being deposited on the top wall of the furnace body of the carbonization furnace, greatly reducing the difficulty of cleaning the deposits on the furnace top, and extending the service life of the furnace to the greatest extent.

[0004] In order to solve the above problems, the present invention provides a carbon fiber low-temperature carbonization furnace, including a carbonization furnace body, the carbonization furnace body having a filament bundle running channel along the running direction of the filament bundle, and an adsorption and transportation carrier between the filament bundle and the top wall of the carbonization furnace body, and the adsorption and transportation carrier can circulate inside and outside the furnace cavity of the carbonization furnace body.

[0005] Preferably, the carbonization furnace body comprises a filament bundle inlet pipe and a filament bundle outlet pipe corresponding to the filament bundle running channel, and the adsorption transport carrier at least partially passes through the filament bundle inlet pipe and the filament bundle outlet pipe.

[0006] Preferably, the carbon fiber low-temperature carbonization furnace further comprises a carrier motion driving unit, and the carrier motion driving unit comprises a plurality of rotating rollers for tensioning and erecting the adsorption and transport carrier, and at least one of the plurality of rotating rollers is drivingly connected to the rotary driving component.

[0007] Preferably, the carbon fiber low-temperature carbonization furnace further comprises a vacuum collecting component, and a negative pressure port of the vacuum collecting component is arranged adjacent to the adsorption and transportation carrier to receive the sediment adsorbed by the adsorption and transportation carrier.

[0008] Preferably, the vacuum collecting component is located outside the furnace cavity.

[0009] Preferably, the adsorption transport carrier includes a horizontal section and a vertical section, and also includes a sediment cleaning component, the sediment cleaning component is arranged adjacent to the vertical section, and the vacuum collecting component is located below the sediment cleaning component to receive the sediment cleaned by the sediment cleaning component.

[0010] Preferably, the circulation direction of the adsorption transport carrier is from the vacuum collecting component toward the sediment cleaning component.

[0011] Preferably, the carbon fiber low-temperature carbonization furnace further comprises a dust cover, which at least covers the cleaning area where the adsorption and transport carrier contacts the sediment cleaning component, and the negative pressure port of the vacuum collection component is within the covering range of the dust cover.

[0012] Preferably, the carbon fiber low-temperature carbonization furnace further comprises a waste discharge pipe, and the waste discharge pipe is located on the side wall of the furnace chamber.

[0013] The present invention provides a carbon fiber low-temperature carbonization furnace, wherein the adsorption and transport carrier is located between the filament bundle and the top wall of the carbonization furnace body, so that particles such as carbon particles in the floating carbonization exhaust gas can be adsorbed thereon, thereby effectively reducing the probability and severity of deposition on the top wall of the carbonization furnace. Since the adsorption and transport carrier can circulate inside and outside the furnace cavity, the particles adsorbed on the adsorption and transport carrier can be conveniently and quickly cleaned outside the furnace cavity, thereby greatly reducing the difficulty of cleaning the furnace top deposits, reducing the frequency of furnace cleaning, and extending the service life of the furnace to the greatest extent; at the same time, this method can synchronously realize the operation of the adsorption and transport carrier during the carbonization process of the filament bundle, without the need to stop the carbonization furnace for cleaning, which greatly improves the flexibility and efficiency of furnace cavity cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a carbon fiber low-temperature carbonization furnace according to an embodiment of the present invention;

[0015] Figure 2 for Figure 1 Schematic diagram of the cross section of the carbonization furnace body (showing the relative position relationship between the adsorption and transport carrier and the filament bundle).

[0016] The reference numerals are:

[0017] 1. Carbonization furnace body; 11. Furnace chamber; 12. Fiber bundle inlet pipe; 13. Fiber bundle outlet pipe; 14. Waste discharge pipe; 2. Adsorption transport carrier; 21. Horizontal section; 22. Vertical section; 31. Rotating roller; 32. Rotary drive component; 4. Vacuum collection component; 5. Sediment cleaning component; 6. Dust cover; 100. Fiber bundle. DETAILED DESCRIPTION

[0018] See also Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a carbon fiber low-temperature carbonization furnace is provided, including a carbonization furnace body 1, wherein the carbonization furnace body 1 has a filament running channel along the running direction of the filament bundle 100, and an adsorption and transportation carrier 2 is provided between the filament bundle 100 and the top wall of the carbonization furnace body 1, and the adsorption and transportation carrier 2 can circulate inside and outside the furnace cavity 11 of the carbonization furnace body 1. In this technical solution, the adsorption and transport carrier 2 is located between the filament bundle 100 and the top wall of the carbonization furnace body 1, so that particles such as carbon particles in the floating carbonized exhaust gas can be adsorbed thereon, thereby effectively reducing the probability and severity of deposition on the top wall of the carbonization furnace. Since the adsorption and transport carrier 2 can circulate inside and outside the furnace chamber 11, the particles adsorbed on the adsorption and transport carrier 2 can be conveniently and quickly cleaned outside the furnace chamber 11, which greatly reduces the difficulty of cleaning the furnace top deposits, reduces the frequency of furnace cleaning (such as scraping in the prior art), and extends the service life of the furnace chamber to the greatest extent; at the same time, this method can realize the operation of the adsorption and transport carrier 2 simultaneously during the carbonization process of the filament bundle 100, without the need to stop the carbonization furnace for cleaning, which greatly improves the flexibility and efficiency of furnace chamber cleaning. Preferably, the adsorption and transport carrier 2 is realized by carbon fiber fabric, which realizes the particle adsorption function through its own micropores and can adapt to the temperature environment of the low-temperature carbonization furnace.

[0019] The carbonization furnace body 1 includes a wire bundle inlet pipe 12 and a wire bundle outlet pipe 13 corresponding to the wire bundle running channel, and the adsorption and transportation carrier 2 at least partially passes through the wire bundle inlet pipe 12 and the wire bundle outlet pipe 13. Specifically, the adsorption and transportation carrier 2 has a horizontal section 21 in the furnace chamber 11 and parallel to the running direction of the wire bundle 100. It can be understood that the horizontal section 21 mentioned here can dynamically change with the operation of the adsorption and transportation carrier 2. In this technical solution, the horizontal section 21 and the wire bundle 100 share the wire bundle inlet pipe 12 and the wire bundle outlet pipe 13, thereby simplifying the sealing treatment of the intersection of the horizontal section 21 entering the furnace chamber 11, that is, it can be achieved by using the existing sealing structure for the wire bundle (it can be understood that necessary improvements can be made in the height dimension).

[0020] The adsorption and transportation carrier 2 can be tensioned by the support frame in the area outside the furnace cavity 11. When cleaning is required, the adsorption and transportation carrier 2 can be manually pulled out of the furnace cavity 11 and then necessary cleaning can be performed. Preferably, the carbon fiber low-temperature carbonization furnace also includes a carrier movement drive unit, and the carrier movement drive unit includes a plurality of rotating rollers 31 for tensioning and setting up the adsorption and transportation carrier 2. At least one of the plurality of rotating rollers 31 is connected to a rotary drive component. The rotary drive component can be, for example, a conventional rotating motor. The corresponding rotating roller 31 is driven by the rotating motor to rotate as an active roller, thereby forcing the adsorption and transportation carrier 2 to rotate around the outer peripheral wall of the plurality of rotating rollers 31 to achieve the aforementioned circulation requirements inside and outside the furnace cavity 11. It can be understood that the remaining plurality of rotating rollers 31 serve as driven rollers, mainly to achieve the function of tensioning the adsorption and transportation carrier 2. As is well known, the plurality of rotating rollers 31 will be pivotally arranged on the corresponding brackets, which will not be elaborated in the present invention.

[0021] Preferably, the carbon fiber low-temperature carbonization furnace also includes a vacuum collecting component 4, and the negative pressure port of the vacuum collecting component is arranged adjacent to the adsorption and transport carrier 2 to adsorb the sediment adsorbed by the adsorption and transport carrier 2. The vacuum collecting component 4 is, for example, a vacuum generator in the prior art, which utilizes the Venturi effect to generate vacuum negative pressure, and then realizes the adsorption and collection of objects through negative pressure. The pressure gas source of the vacuum collecting component 4 can be derived from an air compressor or can be provided by a ready-made pressure gas pipeline in the workshop. Preferably, the vacuum collecting component 4 is outside the furnace cavity 11 to reduce the requirements on the material selection of the vacuum generator.

[0022] like Figure 1As shown, the adsorption and transport carrier 2 also includes a vertical section 22 and a sediment cleaning component 5. The sediment cleaning component 5 is arranged adjacent to the vertical section 22, and the vacuum collecting component 4 is located below the sediment cleaning component 5 to receive the sediment cleaned by the sediment cleaning component 5. The sediment cleaning component 5 is, for example, a roller brush, which is controlled by a driving motor to rotate. During the rotation, the roller brush can physically contact and remove the sediment adhered to the adsorption and transport carrier 2, and the cleaning effect is better. The vacuum collecting component 4 located below it can collect the sediment cleaned by the sediment cleaning component 5 in time, and the structure is more reasonable. More preferably, the circulation direction of the adsorption and transport carrier 2 is from the vacuum collecting component 4 toward the sediment cleaning component 5, that is, as shown in FIG. Figure 1 As shown, the adsorption transport carrier 2 is circulated and transmitted in a clockwise direction. At this time, it is ensured that the adsorption transport carrier 2 is first cleaned by non-contact negative pressure through the vacuum collection component 4, and then cleaned by physical contact through the sediment cleaning component 5. While improving the cleaning effect, it can effectively reduce the degree of dirtiness of the sediment cleaning component 5 in the subsequent process, thereby increasing its service life, reducing the replacement frequency, and reducing the maintenance cost of the carbon fiber low-temperature carbonization furnace.

[0023] Preferably, the carbon fiber low temperature carbonization furnace further includes a dust cover 6, which is at least provided to cover the cleaning area where the adsorption transport carrier 2 contacts the sediment cleaning component 5, and the negative pressure port of the vacuum collection component 4 is within the range of the dust cover 6 to prevent the dust generated by the sediment cleaning component 5 during the cleaning process from escaping, thereby improving the environmental friendliness of the device. The dust cover 6 is preferably made of a transparent material such as transparent plastic, so that the operating status of the internal moving parts can be observed in real time. In order to reduce the overall size of the carbon fiber low temperature carbonization furnace, preferably, the carbon fiber low temperature carbonization furnace further includes a waste discharge pipe 14, which is located on the side wall of the furnace chamber 11, but not on the top wall, so that the adsorption transport carrier 2 is designed to completely cover the top wall of the carbonization furnace body 1, while not causing adverse effects on the exhaust of the furnace chamber 11.

[0024] The carbonized waste gas of the filament bundle 100 may also contain tar and other deposits that are difficult to clean. In order to effectively clean them, preferably, a cleaning nozzle is provided near the deposit cleaning component 5, so that the tar can be cleaned by spraying cleaning liquid through the cleaning nozzle. At this time, a corresponding drying structure is also required to dry the adsorption and transport carrier 2 after cleaning before it is circulated into the furnace chamber 11 again, so as to prevent the cleaning liquid from dripping in the furnace chamber 11 and causing damage to the filament bundle 100. The drying structure may, for example, include a cavity for the adsorption and transport carrier 2 to enter and exit, and the exhaust pipe 14 at least partially flows through it, so as to utilize the exhaust gas temperature in the exhaust pipe 14 (generally around 400°C) to dry the adsorption and transport carrier 2, which is energy-saving and environmentally friendly. As a specific implementation method, for example, the drying structure includes a drying chamber, in which a heat exchange component (such as a heat exchanger) is provided, and the heat exchange component is through-connected to the exhaust pipe 14. A fan component corresponding to the heat exchange component is also provided in the drying chamber. The adsorption and transport carrier 2 is transmitted through the drying chamber, and the fan component drives the air to flow in the drying chamber and exchange heat with the exhaust gas in the heat exchange component, thereby realizing efficient drying of the cleaned adsorption and transport carrier 2 before it enters the furnace chamber 11 again by utilizing the exhaust gas temperature.

[0025] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A carbon fiber low temperature carbonization furnace, characterized in that: The carbonization furnace body (1) comprises a fiber bundle running channel along the running direction of the fiber bundle (100), an adsorption transport carrier (2) is provided between the fiber bundle (100) and the top wall of the carbonization furnace body (1), and the adsorption transport carrier (2) can circulate inside and outside the furnace chamber (11) of the carbonization furnace body (1); the adsorption transport carrier (2) is realized by carbon fiber fabric, and realizes the particle adsorption function through its own micropores; the carbonization furnace body (1) comprises a waste discharge pipe (14), and the waste discharge pipe (14) is located on the side wall of the furnace chamber (11); the carbonization furnace body (1) comprises a sediment cleaning component (5) and a vacuum collecting component (4), the vacuum collecting component (4) is located outside the furnace chamber (11), and the negative pressure port of the vacuum collecting component (4) is arranged adjacent to the adsorption transport carrier (2) to collect the sediment adsorbed by the adsorption transport carrier (2), and the adsorption transport carrier (2) comprises a horizontal section (21) and a vertical section (22). The vertical section (22) is provided with a sediment cleaning component (5) adjacent to the vertical section (22), and the vacuum collecting component (4) is located below the sediment cleaning component (5) to receive the sediment cleaned by the sediment cleaning component (5); a cleaning nozzle is also provided adjacent to the sediment cleaning component (5) so that the tar can be cleaned by spraying cleaning liquid through the cleaning nozzle; a corresponding drying structure is also provided to dry the cleaned adsorption transport carrier (2) before the adsorption transport carrier (2) is circulated into the furnace chamber (11) again, and the drying structure includes a drying chamber, a heat exchange component is provided in the drying chamber, and the heat exchange component is connected to the exhaust pipe (14); a fan component corresponding to the heat exchange component is also provided in the drying chamber, and the adsorption transport carrier (2) is transmitted through the drying chamber, and the fan component drives air to flow in the drying chamber and exchange heat with the exhaust gas in the heat exchange component.

2. The carbonization furnace according to claim 1, characterized in that: The carbonization furnace body (1) comprises a filament bundle inlet pipe (12) and a filament bundle outlet pipe (13) corresponding to the filament bundle running channel, and the adsorption transport carrier (2) at least partially passes through the filament bundle inlet pipe (12) and the filament bundle outlet pipe (13).

3. The carbonization furnace according to claim 2, characterized in that: It also comprises a carrier motion driving unit, the carrier motion driving unit comprising a plurality of rotating rollers (31) for tensioning and erecting the adsorption transport carrier (2), at least one of the plurality of rotating rollers (31) being drivingly connected to a rotary driving component (32).

4. The carbonization furnace according to claim 1, characterized in that: The vacuum collecting component is located outside the furnace chamber (11).

5. The carbonization furnace according to claim 1, characterized in that: The circulation direction of the adsorption transport carrier (2) is from the vacuum collection component (4) toward the sediment cleaning component (5).

6. The carbonization furnace according to claim 1, characterized in that: It also comprises a dust cover (6), wherein the dust cover (6) is at least provided to cover a cleaning area where the adsorption transport carrier (2) contacts the sediment cleaning component (5), and the negative pressure port of the vacuum collection component (4) is within the covering range of the dust cover (6).

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