Carbon fiber oxidation furnace

Abstract

The invention discloses a carbon fiber oxidation furnace, comprising: an oxidation furnace body comprising a furnace chamber for oxidizing tows; the plurality of tuyeres are arranged in the furnace chamber in a plurality of rows and / or a plurality of columns, a tow channel for tows to pass through is formed between the adjacent rows or columns, and the plurality of tuyeres blow hot air to the tow channels to oxidize the tows passing through the tow channels. A plurality of tuyeres are arranged in a furnace chamber and arranged in rows or columns to form a filament channel for a filament bundle to pass through, and the tuyeres directly blow hot air to the filament channel, so that the hot air is intensively guided to the filament bundle, the contact efficiency of the filament bundle and the hot air is enhanced, and compared with a traditional mode of heating the whole furnace chamber by an electric heating furnace body, the heating efficiency is improved. The heat energy acts on the tows more directly, so that the heat energy utilization rate is improved, the tows can rapidly reach the temperature required by oxidation, and the oxidation reaction rate is increased; meanwhile, due to the arrangement of the tuyeres and the design of the yarn channels, the temperature and the airflow distribution in the furnace chamber are more uniform, and the quality and the consistency of the carbon fibers are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber, and in particular relates to a carbon fiber oxidation furnace. Background Art

[0002] The carbon fiber oxidation process is a crucial part of the carbon fiber production process and has a decisive influence on the quality and performance of the final product. During the oxidation stage, polyacrylonitrile (PAN)-based precursors need to be oxidized and stabilized under specific temperature and atmosphere conditions to change their molecular structure and prepare for the subsequent carbonization process. During the entire oxidation process, uniform airflow and temperature distribution in the furnace chamber are particularly critical for controlling the exothermic reaction, which directly affects the quality and output of carbon fibers.

[0003] The furnace body of the traditional electric heating oxidation furnace is complex in structure and bulky in size, which occupies production space and increases equipment investment and plant costs. The thermal efficiency of the electric heater is low, and the heat energy cannot be effectively transferred to the tow itself. A large amount of heat energy is wasted, resulting in high energy consumption and increased production costs. In addition, due to the limitations of the heating method, the temperature in the furnace cavity rises slowly, which cannot meet the demand for rapid heating in the production of large tow carbon fibers, affecting production efficiency. At the same time, the heat transfer method in the traditional oxidation furnace makes it difficult to achieve uniform distribution of temperature and airflow in the furnace cavity, resulting in uneven heating of the tow during the oxidation process, affecting the quality and performance of the carbon fiber. Therefore, how to improve the oxidation effect of the oxidation furnace on the tow, direct the heat energy more concentratedly to the tow itself, and improve the utilization rate of heat energy has become a technical problem that needs to be solved urgently.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a carbon fiber oxidation furnace to improve the oxidation effect of the oxidation furnace on the filament bundle, concentrate the heat energy to the filament bundle, and improve the utilization rate of the heat energy.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A carbon fiber oxidation furnace, comprising: The oxidation furnace body includes a furnace chamber for oxidizing the filament bundle; A plurality of air nozzles are arranged in a plurality of rows and / or columns in the furnace chamber, and a wire path for the wire bundle to pass through is formed between adjacent rows or columns. The plurality of air nozzles blow hot air toward the wire path to oxidize the wire bundle passing through the wire path.

[0007] Further, the air nozzles arranged in several rows include at least one group of air nozzles in adjacent rows that are at least partially staggered in the row direction to form an even wind path; or, the air nozzles arranged in several columns include at least one group of air nozzles in adjacent columns that are at least partially staggered in the column direction to form an even wind path.

[0008] Further, the air nozzles in adjacent rows correspond one-to-one in the row direction and are arranged in a staggered manner to form the evenly distributed wind wire path, or the air nozzles in adjacent columns correspond one-to-one in the column direction and are arranged in a staggered manner to form the evenly distributed wind wire path.

[0009] Furthermore, the air outlet duct of the air nozzle has an air inlet end and an air outlet end which are arranged opposite to each other and connected to the inside and outside of the air outlet duct, and the side wall of at least one side of the air outlet duct is inclined and expanded outward from the air inlet end to the air outlet end to form a wind-distributing side wall, and an air outlet hole is provided on the wind-distributing side wall; The air inlet ends of the plurality of air nozzles in the same row are sequentially arranged in the same direction, the air inlet ends of the plurality of air nozzles in adjacent rows are sequentially staggered in the row direction, and the wind-distributing side walls of the air nozzles in adjacent rows are arranged oppositely to form the wind-distributing wire channel; Alternatively, the air inlet ends of several air nozzles in the same row are arranged in the same direction, and the air inlet ends of several air nozzles in adjacent rows are arranged in a staggered manner in the upward direction of the row, and the wind-distributing side walls of the air nozzles in adjacent rows are arranged relatively to form the wind-distributing wire channel.

[0010] Furthermore, the staggered distance of the staggered arrangement of adjacent rows or columns is smaller than the length of the wind-distributing side wall from the air inlet end to the air outlet end.

[0011] Furthermore, the end of the wind balancing side wall of the wind nozzle near the air outlet end has an air guide portion extending outward perpendicular to the wind balancing side wall, and the extension line of the air guide portion of the wind nozzles in adjacent rows or columns is tangent to the side edge of the corresponding wind balancing side wall of the wind nozzle near the air inlet end.

[0012] Furthermore, a plurality of adjacent rows or columns are arranged in the oxidation furnace body to form a plurality of uniform wind wire channels, and the staggered arrangement directions of adjacent groups of wind nozzles are opposite.

[0013] Furthermore, the oxidation furnace body is provided with a plurality of hot air outlets arranged in a row, and the air inlet ends of each row of air nozzles are sequentially arranged in the same direction and toward the hot air outlet corresponding thereto; Alternatively, a plurality of hot air outlets arranged in rows are provided on the furnace body of the oxidation furnace, and the air inlet ends of each row of air nozzles are arranged in the same direction and toward the corresponding hot air outlets.

[0014] Furthermore, it comprises a first group of oxidation furnace bodies and a second group of oxidation furnace bodies which are arranged in sequence, and the arrangement of the plurality of tuyere in the first and second groups of oxidation furnace bodies are symmetrical to each other; Preferably, each group of oxidation furnace bodies includes at least one oxidation furnace body.

[0015] Furthermore, it also includes: A circulating air channel connected to the oxidation furnace body for introducing hot air into the oxidation furnace body; A natural gas igniter, arranged at the lower part of the oxidation furnace body, for heating the circulating air in the circulating air channel; Preferably, each group of oxidation furnace bodies includes at least two oxidation furnace bodies, and the two oxidation furnace bodies share a natural gas igniter.

[0016] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0017] The present invention provides a plurality of air nozzles in the furnace cavity and arranges them in rows or columns to form a wire path for the filament bundle to pass through. The air nozzles blow hot air directly into the wire path. This design allows the hot air to be concentratedly guided to the filament bundle itself, thereby enhancing the contact efficiency between the filament bundle and the hot air. Compared with the traditional method of heating the entire furnace cavity with an electric heating furnace body, the heat energy acts on the filament bundle more directly, thereby improving the utilization rate of the heat energy, enabling the filament bundle to quickly reach the temperature required for oxidation, and accelerating the oxidation reaction rate.

[0018] The arrangement of the air nozzles and the design of the wire path make the temperature and airflow distribution in the furnace cavity more uniform. The filament bundles pass through a special wire path and receive uniform hot air from the air nozzles, avoiding the problem of uneven heating of the filament bundles caused by temperature gradients in traditional furnaces. In this way, the filament bundles are heated uniformly during the oxidation process and the oxidation reaction is uniform, avoiding unstable fiber performance caused by local overheating or insufficient oxidation, and improving the quality and consistency of carbon fiber.

[0019] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings: Figure 1 , is a schematic diagram of the assembly structure of the carbon fiber oxidation furnace of the present invention; Figure 2 , is a schematic diagram of the structure of the air nozzle of the present invention.

[0021] In the figure: 1. Oxidation furnace body; 11. First furnace body; 12. Second furnace body; 13. Third furnace body; 14. Fourth furnace body; 15. Uniform wind wire duct; 2. Wind nozzle; 21. First wind nozzle; 22. Second wind nozzle; 23. Air inlet end; 24. Air outlet end; 25. Uniform wind side wall; 26. Straight side wall; 27. Air guide part; 3. Exhaust system; 31. First exhaust duct; 32. Second exhaust duct; 33. Third exhaust duct; 34. Fourth exhaust duct; 35. Connecting duct; 36. First exhaust fan; 37. Second exhaust fan; 4. Ignition system; 41. Natural gas fan; 42. Natural gas igniter; 6. Circulation fan; 7. First folding roller; 8. Second folding roller.

[0022] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] As an embodiment of the present invention, Figure 1 like Figure 2 As shown, the carbon fiber oxidation furnace includes an oxidation furnace body 1, which is a closed rectangular parallelepiped structure, and a furnace cavity for oxidizing the tow is formed inside. The furnace body is made of high-strength heat-resistant materials, such as stainless steel or high-temperature alloy steel, and is wrapped with insulation materials (such as ceramic fiberboard or aluminum silicate wool) on the outside to reduce heat loss and ensure the stability of the temperature in the furnace cavity.

[0027] A plurality of tuyere 2 are arranged in a furnace chamber of the oxidation furnace body 1, and the tuyere 2 are arranged in a plurality of rows and / or a plurality of columns. Specifically, the tuyere 2 can be arranged in a matrix in a row direction (transverse direction) or a column direction (longitudinal direction). The spacing between adjacent rows or adjacent columns is designed according to the specifications and quantity of the filament bundles to form a filament path for the filament bundles to pass through.

[0028] The present invention sets a plurality of air nozzles 2 in the furnace cavity and arranges them in rows or columns to form a wire path for the filament bundle to pass through. The air nozzles 2 directly blow hot air to the wire path. This design allows the hot air to be concentrated and directed to the filament bundle itself, thereby enhancing the contact efficiency between the filament bundle and the hot air. Compared with the traditional method of heating the entire furnace cavity with an electric heating furnace body, the heat energy acts on the filament bundle more directly, thereby improving the utilization rate of heat energy, enabling the filament bundle to quickly reach the temperature required for oxidation, and accelerating the oxidation reaction rate.

[0029] The arrangement of the tuyere 2 and the design of the wire path make the temperature and airflow distribution in the furnace cavity more uniform. The filament bundles all pass through a special wire path and receive uniform hot air blowing from the tuyere 2, avoiding the problem of uneven heating of the filament bundles caused by temperature gradient in a traditional furnace. In this way, the filament bundles are heated uniformly during the oxidation process and the oxidation reaction is uniform, avoiding unstable fiber performance caused by local overheating or insufficient oxidation, and improving the quality and consistency of the carbon fiber.

[0030] As an implementation method of this embodiment, a plurality of nozzles 2 are arranged in a plurality of rows, and at least one group of nozzles 2 in adjacent rows are arranged partially staggered in the row direction to form a uniform wind path 15. Specifically, Figure 1 As shown, the first tuyere 21 in the first row near the top of the oxidation furnace body 1 and the second tuyere 22 in the second row below are arranged in an offset manner in the row direction.

[0031] By staggering the nozzles of adjacent rows in the row direction, an even wind filament channel 15 is formed, and the hot air is more evenly distributed in the furnace chamber. The misalignment between the first nozzle 21 and the second nozzle 22 makes the hot air flow paths staggered, avoiding the hot air from being directly superimposed or weakened on the same vertical line. In this way, the filament bundle passing through the even wind filament channel 15 can be affected by hot air from different positions, ensuring that all parts of the filament bundle are heated uniformly and the oxidation reaction is more uniform.

[0032] The staggered arrangement of the air nozzles 2 of the present invention makes the air nozzles 2 in the upper and lower adjacent rows not completely aligned in the row direction, but staggered by a certain distance. Alternatively, a plurality of air nozzles 2 are arranged in a plurality of columns, and at least one group of air nozzles in adjacent columns are at least partially staggered in the column direction to form an even wind wire path 15.

[0033] The staggered arrangement of the air nozzles 2 makes the hot air more evenly distributed in the furnace cavity, avoiding hot air concentration areas and dead corners caused by the aligned arrangement of the air nozzles, and ensuring that the filament bundle is heated evenly; at the same time, the staggered arrangement of the air nozzles 2 increases the coverage area of ​​the hot air, so that all parts of the filament bundle can fully contact the hot air, thereby improving the oxidation efficiency; in addition, the staggered arrangement of the air nozzles 2 helps to reduce turbulence in the hot air flow, stabilize the airflow, and prevent the filament bundle from being disturbed by the airflow during the oxidation process.

[0034] Furthermore, the nozzles 2 in adjacent rows are arranged in a staggered manner with a fixed staggered distance in the row direction. For example, the center position of the nozzles 2 in the upper row is aligned with the edge position of the nozzles 2 in the lower row to form a uniform wind yarn path 15. Alternatively, the nozzles 2 in adjacent columns are arranged in a staggered manner with a fixed staggered distance in the column direction, so that the yarn bundle can be uniformly heated by hot air when passing through the yarn path.

[0035] The one-to-one corresponding and sequentially staggered arrangement of the air nozzles 2 allows the hot air to form a uniform grid distribution in the furnace cavity, further improving the oxidation uniformity of the tow. At the same time, the formation of the uniform wind wire channel 15 helps to guide the running path of the tow in the furnace cavity and prevent the tow from deflecting or shaking.

[0036] As an embodiment of the present invention, Figure 1 and Figure 2 As shown, the air nozzle 2 includes an air outlet duct formed inside, and the air outlet duct has an air inlet end 23 and an air outlet end 24 which are relatively arranged and connected to the inside and outside of the air outlet duct. The air inlet end 23 receives the heated hot air; the air outlet end 24 can guide the hot air to the next air nozzle 2.

[0037] The side wall of at least one side of the air outlet duct is inclined and expanded outward from the air inlet end 23 to the air outlet end 24 to form an air distribution side wall 25. The air distribution side wall 25 is provided with air outlet holes to allow the hot air to be evenly ejected. The side wall on the other side opposite to the air distribution side wall 25 is upright, i.e., a straight side wall 26, forming the boundary of the air outlet duct.

[0038] The air inlet ends 23 of the air nozzles 2 in the same row are arranged in the same direction to ensure the consistency of hot air supply. The air nozzles in adjacent rows are arranged in a staggered manner in the row direction, and the wind-distributing side walls 25 in the upper and lower rows are arranged oppositely to form a wind-distributing wire channel 15.

[0039] Alternatively, when a plurality of air nozzles 2 are arranged in rows, in the row direction, the air inlet ends 23 of the air nozzles in the same row are arranged in the same direction, the air nozzles in adjacent rows are staggered in sequence, and the wind-distributing side walls 25 are arranged opposite to each other to form a wind-distributing wire channel 15 .

[0040] In this embodiment, the inclined outwardly expanding wind-distributing side wall 25 forms a uniform wind field in the wind-distributing yarn channel 15, reducing the clustering and turbulence of the hot air. The air outlet holes on the wind-distributing side wall 25 evenly distribute the hot air in the yarn channel, improving the uniformity of heating the yarn bundle.

[0041] Further, as an implementation manner of this embodiment, the misalignment distance of the misaligned arrangement of adjacent rows or columns is less than the length of the air distribution side wall from the air inlet end to the air outlet end. Specifically, the misalignment distance D is set to be 50% to 90% of the length L of the air distribution side wall 25, that is, D < L. This ensures that the air distribution side walls 25 of the adjacent row air nozzles 2 overlap relatively within a certain range, forming a continuous air distribution filament channel 15. Further, when the filament bundle passes through the filament channel, it is always in a uniform hot air environment, avoiding incomplete hot air coverage caused by excessive misalignment and preventing uneven heating of the filament bundle.

[0042] Further, as an implementation manner of this embodiment, at the end of the air distribution side wall 25 close to the air outlet end 24, a wind guiding portion 27 is extended perpendicularly to the outside of the air distribution side wall. The wind guiding portion 27 is in a plate shape. Preferably, the length of the wind guiding portion 27 can be 10% to 20% of the length of the air distribution side wall 25. The extension lines of the wind guiding portions 27 of the air nozzles 2 in adjacent rows or columns are tangent to the side edges of the corresponding air nozzles' air distribution side walls 25 close to the air inlet end 23.

[0043] The wind guiding portion 27 and the air distribution side wall 25 cooperate to guide the hot air to blow towards the filament bundle. On the one hand, it reduces the direct impact of the hot air on the filament bundle and protects the filament bundle from damage. On the other hand, the setting of the wind guiding portion 27 makes the distribution of the hot air in the filament channel more uniform, further improving the consistency of the filament bundle's heating.

[0044] As another implementation manner of this embodiment, a plurality of groups of adjacent rows or adjacent columns are arranged in the oxidation furnace body 1 to form a plurality of air distribution filament channels 15, and the misaligned arrangement directions of the adjacent groups of air nozzles 2 are opposite; that is, one group of air nozzles is misaligned to the left in the row direction, and the next group of air nozzles is misaligned to the right in the row direction.

[0045] In this implementation manner, a first reversing roller 7 and a second reversing roller 8 are respectively arranged on the left and right sides of the carbon fiber oxidation furnace. The filament bundle is drawn out from one air distribution filament channel 15 to the outside of the oxidation furnace body 1, changes the running direction through the first reversing roller 7, and then enters the oxidation furnace body 1 again. After being drawn out from the other side of the oxidation furnace body 1, the filament bundle changes direction again through the second reversing roller 8 and re-enters the oxidation furnace body 1, and so on in a cycle.

[0046] This solution realizes multiple round trips of the filament bundle in the oxidation furnace by arranging the first reversing roller 7 and the second reversing roller 8 on the left and right sides of the oxidation furnace body 1, extends the oxidation time, enhances the oxidation effect, and improves the quality and performance of the carbon fiber.

[0047] The alternating misaligned arrangement directions make the distribution of the hot air in the furnace cavity more complex and uniform, avoiding the bias of the air flow. At the same time, the design of the alternately arranged air nozzles prevents the filament bundle from being affected by the air flow in a single direction during the oxidation process, reducing the swing and deformation of the filament bundle.

[0048] As an embodiment of the present invention, a plurality of hot air outlets arranged in a row are provided on the furnace body 1 of the oxidation furnace, and the air inlet ends 23 of each row of air nozzles 2 are arranged in the same direction and toward the hot air outlet corresponding thereto. Alternatively, a plurality of hot air outlets arranged in a row are provided on the furnace body 1 of the oxidation furnace, and the air inlet ends 23 of each row of air nozzles 2 are arranged in the same direction and toward the hot air outlet corresponding thereto. The hot air enters the air inlet end 23 of the air nozzle 2 through the hot air outlet, ensuring that each air nozzle can obtain a stable and uniform supply of hot air.

[0049] The hot air outlet directly corresponds to the air inlet end 23 of the air nozzle 2, which reduces the complex pipeline connection and reduces the difficulty of equipment installation and maintenance. At the same time, this setting method shortens the path of hot air from the hot air source to the air nozzle 2, reduces heat loss, and ensures the stability of hot air temperature.

[0050] As another embodiment of the present invention, the oxidation furnace body 1 includes a first group of oxidation furnace bodies and a second group of oxidation furnace bodies arranged in sequence, the first group of oxidation furnace bodies includes one or more oxidation furnace bodies 1; the second group of oxidation furnace bodies is arranged adjacent to the first group of oxidation furnace bodies, and the arrangement of the internal air nozzles 2 is symmetrical to the first group, that is, if the first group of air nozzles 2 is offset to the left in the row direction, the second group of air nozzles 2 is offset to the right in the row direction.

[0051] The multiple groups of oxidation furnace bodies 1 are arranged in sequence, which prolongs the residence time of the tow in the oxidation environment and ensures sufficient oxidation reaction. The mutually symmetrical arrangement of the air nozzles 2 makes the tows receive hot air in opposite directions when passing through different furnace bodies, further evenly heating and stressing the tows.

[0052] As an embodiment of the present invention, the carbon fiber oxidation furnace further includes a circulating air channel, on which a circulating fan 6 is arranged, and the circulating air channel is connected to the oxidation furnace body 1, for conveying circulating hot air into the furnace body. Specifically, the circulating air channel is connected to the hot air outlets of each oxidation furnace body 1 through a pipeline to form a hot air intake system.

[0053] An ignition system 4 is arranged at the lower part of the oxidation furnace body 1, which realizes efficient heating of the circulating air and provides a stable hot air source to meet the temperature requirements of the oxidation treatment of the tow in the oxidation furnace. The ignition system 4 includes a natural gas igniter 42 and a natural gas fan 41. The main function of the natural gas igniter 42 is to burn natural gas, generate a high-temperature flame, and directly heat the circulating air passing through. Its structure consists of a combustion chamber, a combustion nozzle, an ignition device, etc., to ensure sufficient combustion and high thermal efficiency. The natural gas fan 41 provides combustion-supporting air for the natural gas igniter 42 to ensure sufficient combustion of the natural gas.

[0054] Each group of oxidation furnace bodies 1 includes at least two furnace bodies, and the two oxidation furnace bodies share a natural gas igniter 42; for example: the first furnace body 11 and the second furnace body 12 are one group, and the third furnace body 13 and the fourth furnace body 14 are another group, and the first furnace body 11 and the second furnace body 12, the third furnace body 13 and the fourth furnace body 14 respectively share a natural gas igniter 42.

[0055] The natural gas is transported to the natural gas igniter 42 through a pipeline and mixed with the combustion-supporting air in the combustion chamber. The mixed gas is ignited by the ignition device to generate a high-temperature flame. The circulating air is driven by the circulating fan 6, passes through the natural gas igniter 42, is directly heated by the high-temperature flame, and the temperature rises rapidly to form high-temperature hot air. The heated high-temperature hot air is transported to different oxidation furnace bodies 1 through the circulating air channel.

[0056] Preferably, a flow divider or regulating valve is provided in the circulating air channel to ensure that the first furnace body 11, the second furnace body 12, the third furnace body 13, and the fourth furnace body 14 are respectively supplied with balanced hot air. After the hot air enters the oxidation furnace body 1, it enters the air inlet end 23 of the air nozzle 2 through the hot air port, and the hot air is ejected through the air outlet holes on the wind-evening side wall 25 of the air nozzle 2 to form a uniform hot air field, and the filament bundle passing through the wind-evening wire channel 15 is oxidized.

[0057] Further preferably, temperature, pressure and flow sensors are arranged in the circulating air channel and the oxidation furnace body 1 to monitor the parameters of the hot air in real time. The control system can adjust the air volume of the natural gas fan 41, the combustion intensity of the natural gas igniter 42, and the wind speed of the circulating fan 6 to ensure that the temperature inside the furnace body is stable and meets the process requirements.

[0058] As an implementation method of this embodiment, the carbon fiber oxidation furnace includes an exhaust system 3. Specifically, the carbon fiber oxidation furnace includes multiple furnace bodies, namely a first furnace body 11, a second furnace body 12, a third furnace body 13 and a fourth furnace body 14. An exhaust duct connecting the inside and outside of the furnace body is arranged on the top of each furnace body, so as to timely discharge the waste gas and heat generated during the oxidation process and keep the temperature and atmosphere in the furnace cavity stable.

[0059] Specifically, a first exhaust duct 31 is provided at the top of the first furnace body 11, a second exhaust duct 32 is provided at the top of the second furnace body 12, a third exhaust duct 33 is provided at the top of the third furnace body 13, and a fourth exhaust duct 34 is provided at the top of the fourth furnace body 14. In order to achieve unified exhaust management of multiple furnace bodies, the first exhaust duct 31, the second exhaust duct 32, and the third exhaust duct 33 are interconnected through a connecting duct 35. A first exhaust fan 36 is installed on the connecting duct 35 to drive the exhaust system to discharge the waste gas and excess heat in the first three furnace bodies.

[0060] The exhaust system design of the fourth furnace body 14 is different. A second exhaust fan 37 is separately provided on the fourth exhaust duct 34 at the top thereof to independently control the exhaust of the fourth furnace body 14. This design takes into account the differences in oxidation processes of different furnace bodies. The fourth furnace body may have special process parameters and require precise temperature and atmosphere control. Therefore, an exhaust fan is separately configured to meet its unique exhaust requirements.

[0061] Alternatively, in another embodiment, the first exhaust duct 31, the second exhaust duct 32, the third exhaust duct 33 and the fourth exhaust duct 34 are all connected through the connecting duct 35 to achieve unified management of the exhaust systems of all furnaces. Such a design further simplifies the structure of the exhaust system, which is convenient for centralized control and maintenance. However, in this case, it is necessary to ensure that the oxidation process conditions of each furnace are compatible with each other, and the requirements for exhaust volume and exhaust rate are consistent to avoid mutual interference and ensure the stability of the temperature and atmosphere in each furnace.

[0062] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A carbon fiber oxidation furnace, characterized in that: include: The oxidation furnace body includes a furnace chamber for oxidizing the filament bundle; A plurality of air nozzles are arranged in a plurality of rows and / or columns in the furnace chamber, and a wire path for the wire bundle to pass through is formed between adjacent rows or columns. The plurality of air nozzles blow hot air toward the wire path to oxidize the wire bundle passing through the wire path.

2. A carbon fiber oxidation furnace according to claim 1, characterized in that: The air nozzles arranged in several rows include at least one group of air nozzles in adjacent rows that are at least partially staggered in the row direction to form an even wind path; or, the air nozzles arranged in several columns include at least one group of air nozzles in adjacent columns that are at least partially staggered in the column direction to form an even wind path.

3. A carbon fiber oxidation furnace according to claim 2, characterized in that: The air nozzles in adjacent rows correspond one by one in the row direction and are arranged in a staggered manner to form the even wind wire path, or the air nozzles in adjacent columns correspond one by one in the column direction and are arranged in a staggered manner to form the even wind wire path.

4. A carbon fiber oxidation furnace according to claim 3, characterized in that: The air outlet duct of the air nozzle has an air inlet end and an air outlet end which are arranged opposite to each other and connected to the inside and outside of the air outlet duct. The side wall of at least one side of the air outlet duct is inclined and expanded outward from the air inlet end to the air outlet end to form a wind-distributing side wall, and an air outlet hole is provided on the wind-distributing side wall. The air inlet ends of the plurality of air nozzles in the same row are sequentially arranged in the same direction, the air inlet ends of the plurality of air nozzles in adjacent rows are sequentially staggered in the row direction, and the wind-distributing side walls of the air nozzles in adjacent rows are arranged oppositely to form the wind-distributing wire channel; Alternatively, the air inlet ends of several air nozzles in the same row are arranged in the same direction, and the air inlet ends of several air nozzles in adjacent rows are arranged in a staggered manner in the upward direction of the row, and the wind-distributing side walls of the air nozzles in adjacent rows are arranged relatively to form the wind-distributing wire channel.

5. A carbon fiber oxidation furnace according to claim 4, characterized in that: The staggered distance of the staggered arrangement of adjacent rows or columns is smaller than the length of the wind-distributing side wall from the air inlet end to the air outlet end.

6. The carbon fiber oxidation furnace according to claim 5, characterized in that: The end of the wind balancing side wall of the wind nozzle near the air outlet end has an air guide portion extending outwardly perpendicular to the wind balancing side wall, and the extension line of the air guide portion of the wind nozzles in adjacent rows or columns is tangent to the side edge of the corresponding wind balancing side wall of the wind nozzle near the air inlet end.

7. The carbon fiber oxidation furnace according to claim 6, characterized in that: A plurality of adjacent rows or columns are arranged in the oxidation furnace body to form a plurality of uniform wind wire channels, and the staggered arrangement directions of adjacent groups of wind nozzles are opposite.

8. A carbon fiber oxidation furnace according to any one of claims 4 to 7, characterized in that: The oxidation furnace body is provided with a plurality of hot air outlets arranged in a row, and the air inlet ends of each row of air nozzles are arranged in the same direction and toward the hot air outlet corresponding thereto; Alternatively, a plurality of hot air outlets arranged in rows are provided on the furnace body of the oxidation furnace, and the air inlet ends of each row of air nozzles are arranged in the same direction and toward the corresponding hot air outlets.

9. A carbon fiber oxidation furnace according to any one of claims 1 to 8, characterized in that: It comprises a first group of oxidation furnace bodies and a second group of oxidation furnace bodies which are arranged in sequence, and the arrangement of a plurality of air nozzles in the first group and the second group of oxidation furnace bodies is symmetrical to each other; Preferably, each group of oxidation furnace bodies includes at least one oxidation furnace body.

10. The carbon fiber oxidation furnace according to claim 9, characterized in that: Also includes: A circulating air channel connected to the oxidation furnace body for introducing hot air into the oxidation furnace body; A natural gas igniter, arranged at the lower part of the oxidation furnace body, for heating the circulating air in the circulating air channel; Preferably, each group of oxidation furnace bodies includes at least two oxidation furnace bodies, and the two oxidation furnace bodies share a natural gas igniter.

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