A wide-width high-temperature carbonization furnace

Abstract

This invention relates to a wide-width high-temperature carbonization furnace, belonging to the technical field of carbon fiber production equipment. The furnace chamber of this invention has an arched top plate, and the connection between the arched top plate and the side plates is a sliding groove engagement. The furnace body contains an ash accumulation chamber, a graphite scraper capable of completely covering the ash accumulation chamber, and a graphite scraper driving mechanism. The ash accumulation chamber is connected to injection and suction ports located on both sides of the furnace body. The arched top plate of this invention, which is slidably supported by the side plates, provides strong structural stability. Furthermore, the movable graphite scraper and ash accumulation chamber within the furnace allow for automatic cleaning of the furnace without shutting down the production line.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber production equipment technology, and in particular to a wide-width high-temperature carbonization furnace. Background Technology

[0002] A high-temperature carbonization furnace is an industrial heat treatment device that converts organic matter into carbon materials in a high-temperature environment, typically under vacuum or a protective atmosphere. With the rapid development of the carbon fiber industry towards large-scale and high-performance production, single-line capacity continues to increase, and wide-width high-temperature carbonization furnaces, as core production equipment, have expanded to widths exceeding 4 meters. Existing technologies are increasingly facing challenges related to weight and structure: traditional muffle furnaces often employ flat plate structures, which, in the context of wide-width furnace chambers with large spans, exhibit insufficient high-temperature resistance and structural strength, making them prone to thermal deformation during long-term operation, affecting equipment lifespan and operational stability. Simultaneously, the heavy weight of the muffle furnace not only significantly increases the load on the furnace body, but its thick structure also results in high heat capacity and high thermal inertia, leading to slow heating and cooling rates, thus limiting production efficiency and causing unnecessary energy consumption. Therefore, some companies have made improvements to the furnace lining. For example, CN216809039U discloses a low-temperature carbonization furnace lining. To improve structural stability, resist self-weight, and enhance resistance to thermal deformation, it discloses a technical solution of setting a support base between the top and bottom of the furnace lining. The support base includes a support plate, several crossbeams, a cover plate, and support beams. The crossbeams are installed on top of the support plate, the cover plate is installed on the crossbeams, and the support beams are located between the cover plate and the support plate. This device has a complex structure, occupies a large space, and further increases its self-weight, making it difficult to meet the requirements of wide-width carbonization furnaces for structural reliability and lightweight design.

[0003] On the other hand, during the carbonization process, lint and ash accumulate on the muffle bottom plate, affecting thermal efficiency and temperature field uniformity. Large accumulations can also come into contact with the fibers inside the furnace, causing fiber damage. The furnace temperature is high, making manual cleaning difficult. Usually, the production line needs to be shut down periodically for cleaning, resulting in low production efficiency.

[0004] Therefore, it is urgent to carry out structural optimization design for wide-width carbonization furnaces, focusing on solving the problems of excessive muffle weight, insufficient structural strength, difficulty in cleaning, and low production efficiency. Summary of the Invention

[0005] Based on the above analysis, the main objective of this invention is to propose a wide-width high-temperature carbonization furnace to solve at least one of the technical problems of existing wide-width high-temperature carbonization furnaces, such as poor structural stability, susceptibility to change, heavy weight, and difficulty in cleaning the furnace interior.

[0006] To achieve the above objectives, the present invention proposes a wide-width high-temperature carbonization furnace, comprising a furnace body and a furnace chamber. The furnace body includes a shell and an insulation layer disposed inside the shell. The furnace chamber is disposed inside the furnace body. The furnace chamber is composed of a top plate, a bottom plate, and side plates disposed on both sides of the top plate and the bottom plate. The side plates are connected to both ends of the bottom plate. A protrusion is provided at one end of the side plate away from the bottom plate, and sliding grooves adapted to the protrusion are provided at both ends of the top plate. The top plate and the side plates are engaged by the protrusion and the sliding grooves. The projection of the top plate on the radial section of the furnace chamber is arched. The wide-width high-temperature carbonization furnace also includes an ash collection chamber with an open upper end, an open graphite scraper that can at least completely cover the ash collection chamber, and a graphite scraper driving mechanism. The ash collection chamber is located at the end of the wide-width high-temperature carbonization furnace and extends radially through the furnace body. The ash collection chamber has a spray port and a suction port on both sides of the furnace body, respectively, which communicate with the ash collection chamber. The ash collection chamber is located at the bottom of the furnace body. The graphite scraper can be moved horizontally along the surface of the bottom plate.

[0007] Furthermore, the arch span ratio of the top plate is 1:50 to 1:20.

[0008] Furthermore, the top plate, the bottom plate, and the side plate each have several pieces, and are spliced ​​together along the axial direction of the furnace; expansion joints are provided at the connections between the top plates, between the bottom plates, and between the side plates, and the expansion joints are filled with at least one of flexible graphite rope, carbon fiber rope, and boron nitride fiber rope.

[0009] Furthermore, the connections between the top plates, between the bottom plates, and between the side plates adopt a mortise and tenon structure.

[0010] Furthermore, the width of the expansion joint is 2-3 mm, and the total width of the expansion joints along the axial direction of the furnace is not less than 0.5% of the total axial length of the top plate, the bottom plate, or the side plate; the expansion joints are evenly distributed.

[0011] Furthermore, the thickness of the top plate is 30-40 mm; the thickness of the side plate is 2-3 times the thickness of the top plate.

[0012] Furthermore, the top plate, the bottom plate, and the side plate are made of carbon / carbon composite material; the flexural strength of the carbon / carbon composite material is ≥150 MPa, and the elastic modulus is ≥80 GPa.

[0013] Furthermore, the carbon / carbon composite material includes at least one of CX-761, CX-762, and SGC-10.

[0014] Furthermore, the insulation layer is provided with a lightweight microporous calcium silicate board layer, a silica aerogel layer and a graphite hard felt layer from the outside to the inside.

[0015] Furthermore, the thickness of the lightweight microporous calcium silicate board layer is 20-40 mm; the thickness of the silica aerogel layer is 30-50 mm; and the thickness of the graphite hard felt layer is 100-150 mm.

[0016] Furthermore, heating devices are provided on both the upper and lower sides of the furnace chamber, and the heating devices are composed of graphite electrodes and heating plates connected by graphite bolts.

[0017] Furthermore, the heating plates on both sides of the top of the furnace are placed at an angle along the curvature of the top plate, and an upper inclined pad and a lower inclined pad are respectively provided between the inclined heating plates and the graphite electrode and the graphite bolt.

[0018] Furthermore, flanges are welded to the top and bottom of the shell. The graphite electrode passes through the flange and is inserted into the furnace body. A ceramic insulating sleeve is threaded onto the outer circumference of the graphite electrode. The flange has a groove along its inner circumference, and the ceramic insulating sleeve has a flange on its outer circumference. The flange is engaged in the groove. The shell also includes a cover, which is hollow and has a cover plate along its outer circumference. When the cover passes through the graphite electrode and is fixedly connected to the flange, the cover plate abuts against the flange.

[0019] Furthermore, the ash accumulation chamber is located within the insulation layer, and the opening of the ash accumulation chamber is located at the filament inlet or filament outlet of the wide-width high-temperature carbonization furnace.

[0020] Furthermore, the graphite scraper is connected to chains at both ends, and a graphite cylinder and a graphite tube are provided on the side of the ash accumulation chamber near the furnace body port. The graphite cylinder and the graphite tube are connected along the height direction of the furnace body and are both located inside the furnace body. A sealing air chamber is provided at the bottom of the shell, and one end of the graphite tube is inserted into the sealing air chamber. The chain passes through the graphite cylinder, the graphite tube, and the sealing air chamber and is led out of the furnace body.

[0021] Furthermore, the graphite cylinder and the graphite tube are disposed within the insulation layer.

[0022] Furthermore, the chain forms a closed loop at the end away from the graphite scraper.

[0023] Furthermore, the chain is made of carbon / carbon composite material.

[0024] Furthermore, the sealed air cavity has a hollow structure; a buffer interlayer is provided between the inner and outer walls of the sealed air cavity; the buffer interlayer is connected to the outside through the air cavity vent; and multiple layers of circumferentially arranged small holes are provided on the inner wall of the sealed air cavity.

[0025] Furthermore, the graphite cylinder is equipped with a guide wheel, and the furnace body is equipped with a steering sprocket and a transmission sprocket; the chain cooperates with the guide wheel and the steering sprocket, and is driven by the transmission sprocket.

[0026] Furthermore, both ends of the wide-width high-temperature carbonization furnace are provided with the ash accumulation chamber, the graphite cylinder, the graphite tube, the sealing gas chamber, the guide wheel, and the steering sprocket; and the graphite cylinder is closer to both ends of the carbonization furnace than the ash accumulation chamber.

[0027] Furthermore, the ash accumulation chambers, graphite cylinders, graphite tubes, sealing air chambers, guide wheels, and steering sprockets at both ends are all arranged in a mirror orientation.

[0028] Furthermore, the wide-range high-temperature carbonization furnace is equipped with 5 to 12 independent temperature zones, and each independent temperature zone is separated by a partition composed of an upper partition, a side partition, and a lower partition; each independent temperature zone is equipped with an independently controlled distributed intelligent temperature control module; the distributed intelligent temperature control module includes a zone heating unit, a multi-source temperature measurement unit, and an adaptive PID control unit.

[0029] Furthermore, the upper partition, the side partition, and the lower partition are made of graphite rigid felt.

[0030] Furthermore, the base plate is placed on the lower partition plate.

[0031] Furthermore, the independent temperature zone is divided into a temperature control zone with a furnace width of 1-1.5 m and a furnace length of 0.5-1 m. Each temperature control zone is equipped with one set of zone heating unit, multi-source temperature measurement unit and adaptive PID control unit. The zone heating unit is at least one set of heating devices. The multi-source temperature measurement unit includes a thermocouple and a thermal imager. Within each temperature control zone, the adaptive PID control unit is electrically connected to the zone heating unit and the multi-source temperature measurement unit.

[0032] Furthermore, the wide-width high-temperature carbonization furnace also includes a waste heat recovery system; the waste heat recovery system includes a heat pipe waste heat recovery module and a high-efficiency gas filtration and circulation module; the furnace body is provided with a waste gas discharge port and an air inlet; the evaporation section of the heat pipe waste heat recovery module is connected to the waste gas discharge port, and the condensation section of the heat pipe waste heat recovery module is connected to the air inlet; the heat pipe waste heat recovery module is connected to the high-efficiency gas filtration and circulation module, so that the waste gas discharged through the waste gas discharge port passes through the heat pipe waste heat recovery module and then enters the high-efficiency gas filtration and circulation module for filtration and dust removal, and then re-enters the heat pipe waste heat recovery module for heat exchange, and finally enters the furnace for recycling through the air inlet.

[0033] Furthermore, the heat pipe waste heat recovery module includes multiple sets of heat pipe heat exchangers connected in series; the evaporation section of the heat pipe heat exchanger is connected to the exhaust gas outlet, and the condensation section of the heat pipe heat exchanger is connected to the air inlet; the high-efficiency gas filtration and circulation module includes a high-temperature dust collector, a magnetic drive fan, and a proportional control valve; the heat pipe heat exchanger is connected to the high-temperature dust collector; the proportional control valve includes a fresh air inlet channel and an exhaust gas circulation channel, and the exhaust gas circulation channel is connected to the high-temperature dust collector through the magnetic drive fan; the condensation section of the heat pipe heat exchanger is connected to the proportional control valve.

[0034] Furthermore, the heat pipe heat exchanger adopts an integral gravity-type heat pipe.

[0035] Furthermore, the heat pipe waste heat recovery module includes a primary heat exchanger and a secondary heat exchanger connected in series; the evaporation section of the primary heat exchanger is connected to the exhaust gas outlet, and the condensation section of the primary heat exchanger is connected to the air inlet; the high-efficiency gas filtration and circulation module includes a high-temperature dust collector, a magnetic drive fan, and a proportional control valve; the secondary heat exchanger is connected to the high-temperature dust collector; the proportional control valve includes a fresh air inlet channel and an exhaust gas circulation channel, the exhaust gas circulation channel being connected to the high-temperature dust collector via the magnetic drive fan; the condensation section of the secondary heat exchanger is connected to the proportional control valve.

[0036] Furthermore, the primary heat exchanger is a high-temperature heat pipe heat exchanger, the working medium inside the heat pipe is potassium, the shell material is stainless steel, and the operating temperature is 400~1000℃.

[0037] Furthermore, the secondary heat exchanger is a medium-temperature heat pipe heat exchanger, the working medium inside the heat pipe is thermally conductive A, the shell material is stainless steel, and the operating temperature is 150~395℃.

[0038] Furthermore, at the proportional regulating valve, the inert gas treated by the high-temperature dust collector is mixed with fresh inert gas at a ratio of 40-60%.

[0039] Furthermore, it also includes a waste gas incineration device, wherein the high-temperature dust collector is connected to the waste gas incineration device.

[0040] Furthermore, the wide-width high-temperature carbonization furnace is equipped with an automatic correction system at both ends; the automatic correction system includes a wide-width area array CCD vision sensor and a filament correction device; the wide-width area array CCD vision sensor is used to collect filament position information and control the filament correction device to adjust the filament position through signal transmission.

[0041] Furthermore, the automatic correction system also includes a gas sealing device, on which a bracket is fixedly installed, and at least one set of the filament correction devices is fixedly installed on the bracket.

[0042] Furthermore, the gas sealing device is installed at the filament inlet and / or filament outlet of the wide-width high-temperature carbonization furnace.

[0043] Furthermore, the wide-area CCD vision sensor is located at the channel opening of the gas sealing device.

[0044] Furthermore, the wire bundle correction device includes a rack guide rail, a slider is mounted on the rack guide rail, a servo motor is mounted on the slider, and the servo motor drives the slider to move on the rack guide rail; a bracket is mounted on the bottom of the slider; and a wire stop rod is fixedly mounted on the bracket.

[0045] Furthermore, the bracket extends downward to form two opposing sidewalls, and a drive shaft is provided between the two sidewalls. The drive shaft forms left-hand and right-hand external threads on both sides with respect to the center point. The drive shaft is provided with two thread-stopping rods that respectively cooperate with the left-hand and right-hand external threads. A spacing control motor is installed on the bracket, and the spacing control motor is connected to the drive shaft.

[0046] Furthermore, it also includes a guide rod, which is fixed between the two side walls; the ends of the two thread-stopping rods pass through the guide rod.

[0047] Furthermore, the guide rod is located directly above the drive shaft.

[0048] Furthermore, the wide-area CCD vision sensor is electrically connected to the drive circuit of the servo motor and the drive circuit of the spacing control motor.

[0049] Furthermore, there are two brackets, which are respectively fixed to both ends of the gas sealing device; multiple sets of the filament correction device are provided between the two brackets.

[0050] Furthermore, multiple sets of the aforementioned filament correction devices share the same rack and pinion guide.

[0051] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. The furnace top plate of this invention adopts an arched structure design, utilizing the advantages of the arched structure to improve structural stability in large-span scenarios. It employs a flat structure with a small arch-to-span ratio of 1:50 to 1:20. The arched structure exhibits outstanding mechanical properties, effectively resisting thermal deformation and bearing pressure in wide-span furnace environments, thus extending the service life of the muffle furnace. The connection between the arched top plate and the side plates uses a sliding support structure, with matching sliding grooves machined at the top of the side plates and the bottom of the arched top plate. This allows the top plate to expand and contract axially at high temperatures, preventing thermal stress concentration that could lead to cracking. Furthermore, this invention incorporates a dust removal device inside the furnace body, employing a three-stage cleaning scheme combining scraping, inert gas purging, and vacuum suction. This comprehensively removes all types of contaminants, including dust, lint, and debris, while maintaining the high-temperature atmosphere and preventing continuous operation of the high-temperature carbonization furnace. This eliminates contaminant accumulation, which can affect fiber permeability and thermal uniformity, extending the furnace cleaning cycle from 180 days to over 600 days.

[0052] 2. The top plate, bottom plate, and side plates of this invention are all spliced ​​in the axial direction, and the splice joints employ a concave-convex interlocking structure with pre-reserved thermal expansion joints. The joints are filled with flexible graphite rope, which compensates for thermal expansion while ensuring the furnace's airtightness. Strict control over the width and distribution of the thermal expansion joints, as well as the ratio of the total length of all axial thermal expansion joints to the axial length of the muffle, further enhances the furnace structure's strength and high-temperature stability while ensuring the muffle's internal airtightness.

[0053] 3. Compared with the prior art, the thickness of the top plate of the present invention is reduced from the traditional 100~120 mm to 30~40 mm, and the self-weight is significantly reduced; at the same time, the width of the side plate is 2~3 times thicker than the arched top plate, which increases the contact area between the side plate and the bottom and top plates, disperses the concentrated load of the arch foot, and enhances the structural stability.

[0054] 4. This invention uses carbon / carbon composite materials to replace traditional graphite materials to prepare the muffle top plate, bottom plate and side plates, taking into account high-temperature structural strength, thermal shock resistance and airtightness. In combination with the arch structure, the weight of the muffle top plate is reduced by 60-80% and the overall weight of the muffle is reduced by about 50%, thus meeting the lightweight requirements of wide-width high-temperature carbonization furnaces.

[0055] 5. This invention constructs a gradient composite thermal insulation material system, using silica aerogel to replace the middle layer of insulation material, reducing the insulation thickness and lowering heat storage. The insulation layer is laid on the inner wall of the installation cavity in the temperature zone, and the overall insulation layer thickness is 150~240 mm. Compared with the traditional insulation layer (thickness of 350~450 mm), the overall amount of thermal insulation material used is reduced by 40%. The reduced insulation layer thickness results in less heat storage, lower thermal inertia, and a heating and cooling rate increased by more than 30%, shortening the production cycle.

[0056] 6. This invention adopts a small-zone heating arrangement mode and a dual-detection redundancy design of distributed PID control unit and "thermocouple + thermal imager". Combined with the low heat dissipation characteristics of carbon / carbon composite muffle, the thermal imager can capture local temperature field fluctuations in real time and adjust them through feedback from the PID control unit, effectively solving the problem of uneven temperature in wide furnace chambers. The temperature deviation of the entire cross section is ≤±2℃, and the product strength CV value is ≤2.5%, meeting the needs of large-scale production of carbon fibers with a width of ≥4m.

[0057] 7. This invention, by configuring a waste heat recovery module, achieves an inert gas recycling rate of ≥70%, reduces inert gas consumption by 40%~50%, and a waste heat recovery module with a heat pipe type that increases the waste heat recovery rate to ≥65%. The circulating inert gas is preheated to 500~600℃, reducing the furnace heating power by 10%~15%. The lightweight design reduces the heat storage of carbon / carbon composite muffles and thermal insulation materials, further reducing furnace energy consumption by 5%~8%, resulting in a comprehensive energy consumption reduction of over 20%. A single furnace can save over one million yuan in annual costs, significantly reducing energy and raw material costs.

[0058] 8. This invention is equipped with an automatic correction system, which uses a wide-area CCD vision sensor to capture real-time images of the fiber bundle edge. The image algorithm identifies the deviation amount, fiber bundle width, and fiber breakage, with an accuracy of ±0.2mm. It visually collects the width, position, and fiber breakage of fibers entering and exiting the high-temperature carbonization furnace. It automatically corrects the fiber width and position for products of different specifications and provides real-time feedback and alarms on fiber breakage and position. It is suitable for ultra-wide fiber bundles. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the radial cross-section of a wide-width high-temperature carbonization furnace in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the radial cross-section of a wide-width high-temperature carbonization furnace in an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the axial cross-section of the wide-width high-temperature carbonization furnace in an embodiment of the present invention; Figure 4 In this embodiment of the invention, the connection between the top plate and the side plate is ( Figure 2 A magnified view of a portion of section A); Figure 5In this embodiment of the invention, the connection point between the graphite electrode and the tilted heating plate is ( Figure 2 Enlarged view of part B); Figure 6 In this embodiment of the invention, the connection between the graphite electrode and the housing is ( Figure 2 A magnified view of a portion of (C). Figure 7 This is an isometric view of the inlet direction of the wide-width high-temperature carbonization furnace in an embodiment of the present invention; Figure 8 This is an isometric view of the outlet direction of the wide-width high-temperature carbonization furnace in an embodiment of the present invention; Figure 9 The dust removal device in the embodiment of the present invention ( Figure 3 A magnified view of a portion of D); Figure 10 This is a schematic diagram of the structure of the sealed air cavity in an embodiment of the present invention; Figure 11 This is a flowchart illustrating the workflow of the distributed intelligent temperature control module system in an embodiment of the present invention. Figure 12 This is a flowchart illustrating the inert gas recycling and waste heat recovery process of the wide-width high-temperature carbonization furnace in an embodiment of the present invention. Figure 13 This is an isometric view of a wide-width high-temperature carbonization furnace after the installation of a wire bundle correction device in an embodiment of the present invention; Figure 14 The outlet / inlet of the wide-width high-temperature carbonization furnace after installing the wire bundle correction device in this embodiment of the invention. Figure 13 A magnified view of a portion of E); Figure 15 This is a schematic diagram of the filament correction device in an embodiment of the present invention.

[0061] In the attached diagram: 100 - Wide-width high-temperature carbonization furnace; 110 - Furnace body; 111 - Shell; 112 - Insulation layer; 1121 - Lightweight microporous calcium silicate board layer; 1122 - Silica aerogel layer; 1123 - Graphite hard felt layer; 113 - Exhaust gas outlet; 114 - Air inlet; 120 - Furnace chamber; 121 - Top plate; 1211 - Sliding groove; 122 - Bottom plate; 123 - Side plate; 1231 -Protrusion, 124-Expansion joint, 125-Heating device, 1251-Graphite electrode, 1252-Heating plate, 1253-Graphite bolt, 1254-Upper inclined gasket, 1255-Lower inclined gasket, 130-Flange, 131-Groove, 140-Ceramic insulating sleeve, 141-Flange, 150-Gland, 151-Cover plate, 160-Upper partition, 170-Side partition, 180-Lower partition; 200-Waste gas heat recovery system, 210-Heat pipe type waste heat recovery module, 211-Primary heat exchanger, 212-Secondary heat exchanger, 220-High-efficiency gas filtration and circulation module, 221-High-temperature dust collector, 222-Magnetic drive fan, 223-Proportional regulating valve, 2231-Fresh air intake channel, 2232-Waste gas circulation channel, 230-Waste gas incineration device; 310-Dust collection chamber, 311-Spray nozzle, 312-Suction port, 320-Graphite scraper, 330-Chain, 340-Graphite cylinder, 350-Graphite tube, 360-Sealed air chamber, 361-Buffer interlayer, 362-Air chamber vent, 363-Small hole, 370-Guide wheel, 380-Steering sprocket, 390-Transmission sprocket; 400-Wire bundle correction device, 410-Rack and pinion guide rail, 420-Slider, 430-Servo motor, 440-Bracket, 441-Side wall, 450-Guide rod, 460-Drive shaft, 470-Wire stop rod, 480-Gap control motor; 510 - Gas sealing device, 520 - Bracket.

[0062] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] It should be noted that if the embodiments of the present invention involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0065] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0066] Example 1 like Figures 1-15 This embodiment provides a wide-width high-temperature carbonization furnace 100, including a furnace body 110 and a furnace chamber 120. The furnace body 110 includes a shell 111 and a heat insulation layer 112 disposed inside the shell 111. The shell 111 is located as the outermost layer of the wide-width high-temperature carbonization furnace 100. The heat insulation layer 112 is provided from the outside to the inside as follows: a lightweight microporous calcium silicate board layer 1121 with a thickness of 20-40 mm, a silica aerogel layer 1122 with a thickness of 30-50 mm, and a graphite hard felt layer 1123 with a thickness of 100-150 mm.

[0067] It should be noted that this invention constructs a gradient composite thermal insulation material system, using silica aerogel to replace the middle layer of insulation material, reducing the insulation thickness and heat storage. The overall insulation layer thickness is 150-240 mm. Compared to traditional insulation layers, the overall amount of thermal insulation material used is reduced by 40%, resulting in lower thermal inertia. Traditional carbonization furnaces require 164 hours to heat from room temperature to 2000℃ and 170 hours to cool down to room temperature; the carbonization furnace of this invention requires only 110 hours to heat from room temperature to 2000℃ and 114 hours to cool down. The heating and cooling rates are increased by more than 30%, shortening the production cycle.

[0068] In this embodiment, the furnace chamber 120 is located inside the furnace body 110; the furnace chamber 120 is composed of a top plate 121, a bottom plate 122, and side plates 123 disposed on both sides of the top plate 121 and the bottom plate 122; the side plates 123 on both sides are connected to the two ends of the bottom plate 122; a protrusion 1231 is provided at the end of the side plate 123 away from the bottom plate 122, and sliding grooves 1211 adapted to the protrusion 1231 are provided at both ends of the top plate 121; the top plate 121 and the side plate 123 are engaged by the protrusion 1231 and the sliding grooves 1211.

[0069] It should be noted that the connection between the arched top plate 121 and the side plate 123 adopts a sliding support structure, which allows the top plate 121 to expand and contract axially at high temperatures, avoiding thermal stress concentration that could lead to cracking and enhancing thermal stability.

[0070] In this embodiment, the top plate 121, bottom plate 122, and side plate 123 are each composed of several pieces, and are spliced ​​together along the axial direction of the furnace 120; it should be noted that the axial direction is the direction of the wire bundle running. More preferably, the connections between the top plates 121, between the bottom plates 122, and between the side plates 123 adopt a mortise and tenon structure, and an expansion joint 124 is provided at the connection point. The expansion joint 124 is filled with at least one of flexible graphite rope, carbon fiber rope, and boron nitride fiber rope. In this embodiment, the expansion joint 124 is filled with flexible graphite rope. The width of the expansion joint 124 is 2~3 mm, and along the axial direction of the furnace 120, the total width of the expansion joint 124 is not less than 0.5% of the total axial length of the top plate 121, bottom plate 122, or side plate 123; the expansion joints 124 are evenly distributed.

[0071] It should be noted that the top plate 121, bottom plate 122, and side plate 123 are spliced ​​axially, which can be a tenon-and-groove joint. The modular design of the muffle (i.e., the top plate, bottom plate, and side plate) facilitates installation and expansion, and can adapt to the needs of high-temperature carbonization furnaces of different lengths. A concave-convex interlocking structure is used at the splicing points, and thermal expansion joints are evenly reserved. The total length of all axial thermal expansion joints is not less than 0.5% of the total axial length of the muffle and is evenly distributed. Flexible graphite rope is filled into the joints to compensate for thermal expansion and ensure the airtightness of the muffle. Strict control over the width and distribution of the thermal expansion joints, as well as the ratio of the total length of all axial thermal expansion joints to the axial length of the muffle, ensures the airtightness of the muffle while further enhancing the structural strength and high-temperature stability of the furnace.

[0072] In this embodiment, the projection of the top plate 121 onto the radial section of the furnace 120 is arched. Specifically, the arch span ratio of the top plate 121 is 1:50 to 1:20.

[0073] It should be noted that the radial section of the furnace 120 specifically refers to the section perpendicular to the axial direction.

[0074] It should be noted that the top plate 121 of the present invention adopts an arched structure with a small arch span and a flat design, which is more suitable for use scenarios where the furnace height is limited. The curvature of the arch can be adapted to the furnace cavity width, heating structure and furnace thermal field. The mechanical properties are stable and can effectively reduce the thermal deformation and bearing pressure in scenarios with wide furnace cavities and large spans, thus extending the service life of the muffle. In some preferred embodiments, the wide-width high-temperature carbonization furnace 100 further includes an ash collection chamber 310 with an open upper end, a graphite scraper 320 that can at least completely cover the ash collection chamber 310, and a graphite scraper driving mechanism. The ash collection chamber 310 is located at the end of the wide-width high-temperature carbonization furnace 100 and extends radially through the furnace body 110. The ash collection chamber 310 has a spray port 311 and a suction port 312 on both sides of the furnace body 110, which communicate with the cavity of the ash collection chamber 310. The ash collection chamber 310 is located at the bottom inside the furnace body 110. The graphite scraper 320 can be translated along the surface of the bottom plate 122.

[0075] In this embodiment, the thickness of the top plate 121 is 30~40 mm; the thickness of the side plate 123 is 2~3 times the thickness of the top plate 121.

[0076] It should be noted that the thickness of the side plate 123 is 2 to 3 times that of the top plate 121, which increases the contact area between the side plate 123 and the bottom plate 122 and the top plate 121, dispersing the concentrated load on the arch foot and enhancing structural stability. Based on the arched design of the top plate 121, while ensuring structural strength and high-temperature stability, the thickness of the top plate 121 is reduced from the conventional thickness of 100 to 120 mm in the prior art to 30 to 40 mm, and the self-weight of the muffle top plate 121 is significantly reduced by 60 to 80%.

[0077] In this embodiment, the top plate 121, the bottom plate 122, and the side plate 123 are made of carbon / carbon composite material; the flexural strength of the carbon / carbon composite material is ≥150 MPa, and the elastic modulus is ≥80 GPa.

[0078] It should be noted that carbon / carbon composite materials, also known as carbon fiber reinforced carbon-based composite materials, offer a balance of high-temperature structural strength, thermal shock resistance, and airtightness, significantly reducing weight compared to traditional graphite materials. In existing technologies, the total mass of graphite materials used in traditional wide-width high-temperature carbonization furnaces is approximately 26,000 kg, and the total mass of insulation materials is approximately 15,000 kg. In contrast, the wide-width high-temperature carbonization furnace of this invention uses carbon / carbon composite materials with a total mass of 10,500 kg and insulation materials with a total mass of 7,800 kg. This invention achieves an overall weight reduction of approximately 50%.

[0079] It should be noted that carbon / carbon composite materials can be selected as needed, as long as they meet the requirements of flexural strength ≥150MPa and elastic modulus ≥80 GPa, including but not limited to CX-761 and CX-762 from Toyo Carbon of Japan and SGC-10 from China Steel New Materials.

[0080] Heating devices 125 are provided on both the upper and lower sides of the furnace chamber 120. Each heating device 125 consists of a graphite electrode 1251 and a heating plate 1252 connected by graphite bolts 1253. The heating plates 1252 on both sides of the top of the furnace chamber 120 are placed at an angle along the curvature of the top plate 121. Upper inclined pads 1254 and lower inclined pads 1255 are respectively provided between the inclined heating plates 1252 and the graphite electrodes 1251 and graphite bolts 1253. Upper inclined pads 1254 and lower inclined pads 1255 are provided at the connection points between the graphite electrodes 1251 and graphite bolts 1253 and the inclined heating plates 1252 to address the contact issue between the flat surface and the inclined surface.

[0081] Flanges 130 are welded to the top and bottom of the shell 111. Graphite electrode 1251 passes through flanges 130 and is inserted into the furnace body 110. A ceramic insulating sleeve 140 is threaded onto the outer circumference of graphite electrode 1251. Flange 130 has a groove 131 along its inner circumference, and the outer circumference of ceramic insulating sleeve 140 has a flange 141. During installation, flange 141 is engaged in groove 131. A pressure cap 150 is also included. The pressure cap 150 is hollow and has a cover plate 151 along its outer circumference. When the pressure cap 150 passes through graphite electrode 1251 and is fixedly connected to flange 130, cover plate 151 abuts against flange 141. The ceramic insulating sleeve 140, flange 130, and pressure cap 150 work together to solve the sealing problem of graphite electrode 1251 entering the furnace.

[0082] In some embodiments, the ash collection chamber 310 is located inside the insulation layer 112, and the opening of the ash collection chamber 310 is located at the filament inlet or filament outlet of the wide-width high-temperature carbonization furnace 100.

[0083] In some embodiments, the graphite scraper 320 is connected to two ends of a chain 330. The ash collection chamber 310 is provided with a graphite cylinder 340 and a graphite tube 350 on the side near the port of the furnace body 110. The graphite cylinder 340 and the graphite tube 350 are connected along the height direction of the furnace body 110 and are both located inside the furnace body 110. A sealing air chamber 360 is provided at the bottom of the shell 111. One end of the graphite tube 350 is inserted into the sealing air chamber 360. The chain 330 passes through the graphite cylinder 340, the graphite tube 350 and the sealing air chamber 360 and is led out of the furnace body 110.

[0084] In some preferred embodiments, the graphite cylinder 340 and the graphite tube 350 are disposed within the insulation layer 112.

[0085] In some preferred embodiments, the chain 330 forms a closed loop at the end away from the graphite scraper 320. The chain can be driven by a single drive component, simplifying the device. The chain 330 is made of carbon / carbon composite material. It can withstand the high temperatures inside the furnace and has a low coefficient of thermal expansion, resulting in minimal elongation due to thermal expansion and ensuring transmission stability.

[0086] In some embodiments, a guide wheel 370 is provided inside the graphite cylinder 340, and a steering sprocket 380 and a drive sprocket 390 are provided outside the furnace body 110; the chain 330 cooperates with the guide wheel 370 and the steering sprocket 380, and is driven by the drive sprocket 390. This realizes the closed-loop movement of the chain 330 and the graphite scraper 320, thereby realizing the reciprocating motion and positioning of the graphite scraper 320 within the furnace chamber 120.

[0087] It should be noted that a graphite scraper 320 is installed inside the furnace body 110, and the two ends of the graphite scraper 320 are connected to a chain 330. The graphite cylinder 340 and the graphite tube 350 are installed inside the insulation layer 112, which together form a channel for the chain 330 to pass through the insulation layer. The guide wheel 370 is fixed inside the graphite cylinder 340 and together with the steering sprocket 380, it plays the role of guiding the chain 330. The drive sprocket 390 provides power and controls the reciprocating motion and positioning of the graphite scraper 320 in the furnace chamber 120 by driving the chain 330. The drive sprocket 390 drives the graphite scraper 320 to scrape the dust, lint, and other particles deposited at the bottom of the furnace 120 into the ash accumulation chamber 310. The graphite scraper 320 continues to move until it completely covers the ash accumulation chamber 310. Then, the spray nozzles 311 and suction ports 312 at both ends of the ash accumulation chamber 310 are opened simultaneously. The dust and lint in the ash accumulation chamber 310 are blown into the external vacuum tank in a short time. Finally, the spray nozzles 311 and suction ports 312 are closed simultaneously.

[0088] In this embodiment, the sealing air cavity 360 is a hollow structure; a buffer interlayer 361 is provided between the inner wall and the outer wall of the sealing air cavity 360; the buffer interlayer 361 is connected to the outside through the air cavity vent 362; and multiple layers of circumferentially arranged small holes 363 are opened on the inner wall of the sealing air cavity 360.

[0089] It should be noted that the sealing gas chamber 360 is welded to the bottom of the shell 111, and one end of the graphite tube 350 is inserted into the sealing gas chamber 360. When the equipment is running, inert gas is introduced into the gas chamber vent 362 of the sealing gas chamber 360. The gas is first pressurized in the buffer jacket 361, and then discharged through the multi-layer annular holes 363 opened on the inner wall of the sealing gas chamber 360, forming a multi-layer sealing gas curtain, thereby preventing external air from entering the furnace chamber.

[0090] In some preferred embodiments, there are two ash collection chambers 310. Each end of the wide-width high-temperature carbonization furnace 100 is provided with an ash collection chamber 310, a graphite cylinder 340, a graphite tube 350, a sealing gas chamber 360, a guide wheel 370, and a steering sprocket 380; and the graphite cylinder 340 is closer to both ends of the wide-width high-temperature carbonization furnace 100 than the ash collection chamber 310. More preferably, the ash collection chambers 310, graphite cylinders 340, graphite tubes 350, sealing gas chambers 360, guide wheels 370, and steering sprockets 380 at both ends are arranged in a mirror orientation. The graphite scraper 320 can reciprocate within the carbonization furnace to clean dust, lint, etc., from the furnace.

[0091] In some preferred embodiments, the wide-width high-temperature carbonization furnace 100 can be configured with 5 to 12 independent temperature zones. In this embodiment, 5 independent temperature zones are configured. Each independent temperature zone is separated by a partition consisting of an upper partition 160, a side partition 170, and a lower partition 180. Each independent temperature zone is equipped with a distributed intelligent temperature control module for independent temperature control. The distributed intelligent temperature control module includes a zone heating unit, a multi-source temperature measurement unit, and an adaptive PID control unit. Each independent temperature zone is divided into a temperature control zone every 1 to 1.5 m of furnace width and every 0.5 to 1 m of furnace length. Each temperature control zone is equipped with one set of zone heating units, a multi-source temperature measurement unit, and an adaptive PID control unit. The zone heating unit consists of at least one set of heating devices 125. The multi-source temperature measurement unit includes a thermocouple and a thermal imager. Within each temperature control zone, the adaptive PID control unit is electrically connected to the zone heating unit and the multi-source temperature measurement unit.

[0092] It should be noted that, depending on the specific requirements of the process temperature gradient and production speed, the high-temperature carbonization furnace can be set with 5 to 12 independent temperature zones, each with a different production temperature. To ensure uniform temperature distribution within each independent temperature zone, this invention employs a distributed intelligent temperature control module. Within each independent temperature zone, a temperature control partition is defined by dividing the furnace body width into 1 to 1.5 m sections and the furnace body length into 0.5 to 1 m sections. Each temperature control partition is equipped with a set of independently temperature-controlled partition heating units, multi-source temperature measurement units, and adaptive PID control units. The partition heating units, multi-source temperature measurement units, and adaptive PID control units correspond one-to-one, precisely controlling the temperature within each temperature control partition. The partition heating unit is the heating device 125. The multi-source temperature measurement unit includes thermocouples and a thermal imager. The thermocouples are used for measuring temperatures below 1000℃, while the thermal imager is designed to adapt to the high-temperature carbonization environment, equipped with a dual cooling system of air cooling and water cooling to prevent damage from high temperatures, and is used for measuring temperatures above 1000℃. The two devices switch seamlessly at high temperatures. A thermal imager can acquire the 2D temperature field distribution within the temperature-controlled zone in real time, accurately identifying local hot or cold spots, and feeding the temperature parameters back to the PID control unit. The PID control unit performs power compensation based on the temperature deviation, adaptively adjusting the control parameters to ensure that the temperature deviation in the longitudinal and transverse directions within the furnace is ≤±2℃.

[0093] The multi-source temperature measurement unit collects the temperature within the zone in real time, then identifies the thermal field distribution and determines the temperature deviation. If the temperature is too high, the power of the heating device in the high-temperature area is reduced; if the temperature is too low, the power of the heating device in the low-temperature area is increased; if the temperature is normal, the heating power of the corresponding area is maintained; finally, the temperature is collected in real time again and the system enters a loop mode.

[0094] The heating device 125 can be set in a reasonable number according to the size of the carbonization furnace, the size of the independent temperature zone, and the size of the temperature control zone.

[0095] In some preferred embodiments, the upper partition 160, the side partition 170, and the lower partition 180 are made of graphite rigid felt. More preferably, the base plate 122 is placed on the lower partition 180.

[0096] It should be noted that by using graphite hard felt as a support and temperature zone baffle at the bottom of the furnace cavity, replacing the original graphite support columns, the total amount of graphite material used in the muffle and its support inside the furnace is reduced by 40-60%. At the same time, the heat capacity of the graphite material is reduced, heat storage is reduced, and the heating rate is increased.

[0097] In some preferred embodiments, the wide-width high-temperature carbonization furnace 100 further includes a waste heat recovery system 200; the waste heat recovery system 200 includes a heat pipe waste heat recovery module 210 and a high-efficiency gas filtration and circulation module 220; the furnace body 110 is provided with a waste gas discharge port 113 and an air inlet 114; the evaporation section of the heat pipe waste heat recovery module 210 is connected to the waste gas discharge port 113, and the condensation section of the heat pipe waste heat recovery module 210 is connected to the air inlet 114; the heat pipe waste heat recovery module 210 is connected to the high-efficiency gas filtration and circulation module 220, so that the waste gas discharged through the waste gas discharge port 113 passes through the heat pipe waste heat recovery module 210 and then enters the high-efficiency gas filtration and circulation module 220 for filtration and dust removal, and then re-enters the heat pipe waste heat recovery module 210 for heat exchange, and finally enters the furnace through the air inlet 114 for recycling.

[0098] In some preferred embodiments, the heat pipe waste heat recovery module 210 includes multiple sets of heat pipe heat exchangers connected in series; the evaporation section of the heat pipe heat exchanger is connected to the exhaust gas outlet 113; the heat pipe heat exchanger is connected to the high-temperature dust collector 221; the high-efficiency gas filtration and circulation module 220 includes the high-temperature dust collector 221, the magnetic drive fan 222, and the proportional control valve 223; the proportional control valve 223 includes a fresh air intake channel 2231 and an exhaust gas circulation channel 2232, the exhaust gas circulation channel 2232 is connected to the high-temperature dust collector 221 through the magnetic drive fan 222; the condensation section of the heat pipe heat exchanger is connected to the proportional control valve 223 and the air inlet 114 respectively.

[0099] More preferably, the heat pipe heat exchanger uses an integral gravity heat pipe.

[0100] Understandably, the number of heat pipe heat exchangers connected in series can be selected according to actual needs. In this embodiment, the heat pipe waste heat recovery module 210 includes a primary heat exchanger 211 and a secondary heat exchanger 212 connected in series; the high-efficiency gas filtration and circulation module 220 includes a high-temperature dust collector 221, a magnetic drive fan 222, and a proportional control valve 223; the evaporation section of the primary heat exchanger 211 is connected to the exhaust gas outlet 113; the condensation section of the primary heat exchanger 211 is connected to the air inlet 114; the secondary heat exchanger 212 is connected to the high-temperature dust collector 221; the proportional control valve 223 includes a fresh air intake channel 2231 and an exhaust gas circulation channel 2232, the exhaust gas circulation channel 2232 is connected to the high-temperature dust collector 221 through the magnetic drive fan 222; the condensation section of the secondary heat exchanger 212 is connected to the proportional control valve 223. Specifically, at the proportional regulating valve 223, the inert gas treated by the high-temperature dust collector 221 is mixed with fresh inert gas at a ratio of 40-60%.

[0101] It should be noted that the high-temperature dust collector 221 is a closed structure used to filter and remove dust and lint from the gas discharged from the furnace; the magnetic drive fan 222 is used to lead the filtered inert gas out of the dust collector; the filtered inert gas is mixed with the replenished fresh inert gas at a ratio of 40% to 60% through the proportional regulating valve 223, and then enters the heat pipe type waste heat recovery module 210 to realize the recycling of inert gas. The remaining waste gas and dust and lint enter the waste gas treatment device for harmless treatment.

[0102] In some preferred embodiments, the primary heat exchanger 211 is a high-temperature heat pipe heat exchanger, the working medium inside the heat pipe is potassium, the shell material is stainless steel, and the operating temperature is 400~1000℃.

[0103] In some preferred embodiments, the secondary heat exchanger 212 is a medium-temperature heat pipe heat exchanger, the working medium inside the heat pipe is thermally conductive A, the shell material is stainless steel, and the operating temperature is 150~395℃.

[0104] In some preferred embodiments, the waste heat recovery system 200 further includes a waste gas incineration device 230, which is connected to a high-temperature dust collector 221.

[0105] In operation, the exhaust gas inside the furnace body 110 first enters the evaporation section of the primary heat exchanger 211 through the exhaust gas outlet 113. After being cooled, it enters the evaporation section of the secondary heat exchanger 212, and then enters the high-temperature dust collector 221. The filtered lint, dust, and part of the exhaust gas enter the exhaust gas incineration device 230 for harmless treatment. The magnetic drive fan 222 draws out the filtered exhaust gas. The exhaust gas enters the proportional regulating valve 223 together with the fresh inert gas sent in through the exhaust gas circulation channel 2232 and the fresh air intake channel 2231. After the mixing ratio is adjusted by the proportional regulating valve 223, the gas enters the condensation section of the secondary heat exchanger 212 and is heated to above 200℃~300℃. After the initial heating, the gas enters the condensation section of the primary heat exchanger 211 and is heated to above 500℃~600℃. After the secondary heating, the high-temperature gas enters the air inlets 114 at both ends of the furnace body 110, realizing the comprehensive recovery and utilization of inert gas and waste heat from the exhaust gas.

[0106] It should be noted that the total amount of inert gas used in the carbonization furnace is approximately 960 m³. 3 / h, of which approximately 600 m³ of exhaust gas is discharged through the intermediate exhaust port 113 of the furnace body 110. 3 / h, the remainder is discharged through the furnace openings at both ends, and the exhaust gas discharged through the furnace openings at both ends cannot be collected. Therefore, the inert gas recycling rate actually refers to the recycling rate of the exhaust gas discharged through exhaust outlet 113. The exhaust gas discharged through exhaust outlet 113 is approximately 450 m³. 3 / h can be recovered through filtration, mixed at 510 m 3 Fresh inert gas is then supplied to the carbonization furnace again after being recycled. Therefore, using the above-mentioned waste gas heat recovery system, the inert gas recycling rate is ≥70%, and the inert gas consumption is reduced by 40-50%. In the above-mentioned waste gas heat recovery system, before entering the heat exchanger, the temperature of the waste gas is about 900℃, and the total heat contained in the waste gas per hour is 756,000 kJ (the total heat released when cooled to room temperature). After passing through the waste gas heat recovery system, the temperature of the mixed new and old gases is about 110℃, and after heat exchange, it can reach about 550℃. The actual heat absorbed per hour is 570,000 kJ, and the temperature of the waste gas after heat exchange is about 200℃. Therefore, the waste heat recovery rate of the waste gas heat recovery system is ≥65%.

[0107] In some preferred embodiments, the wide-width high-temperature carbonization furnace 100 is provided with an automatic correction system at both ends; the automatic correction system includes a wide-width area array CCD vision sensor and a filament correction device 400; the wide-width area array CCD vision sensor is used to collect filament position information and control the filament correction device 400 to adjust the filament position through signal transmission.

[0108] The automatic yarn correction system also includes a gas sealing device 510, on which a bracket 520 is fixedly mounted, and at least one set of yarn correction devices 400 is fixedly mounted on the bracket 520. Specifically, the gas sealing device 510 is installed at the yarn inlet and / or yarn outlet of the wide-width high-temperature carbonization furnace 100. In this embodiment, the gas sealing device 510 is installed at both ends of the furnace body 110. A wide-width area array CCD vision sensor is located at the channel opening of the gas sealing device 510.

[0109] It is understandable that the wide-area CCD vision sensor is used to collect position information when the filament bundle enters and exits the carbonization furnace. Therefore, the wide-area CCD vision sensor is correspondingly set at the channel opening of the gas sealing device 510 at the filament bundle inlet and at the channel opening of the gas sealing device 510 at the filament bundle outlet.

[0110] The wire bundle correction device 400 includes a rack guide rail 410, a slider 420 mounted on the rack guide rail 410, a servo motor 430 mounted on the slider 420, and the servo motor 430 driving the slider 420 to move on the rack guide rail 410; a bracket 440 is mounted on the bottom of the slider 420; and a wire guide rod 470 is fixedly mounted on the bracket 440.

[0111] To further control the unfolding width of the filament bundle, in some preferred embodiments, the support 440 extends downward to form two opposing sidewalls 441, and a drive shaft 460 is provided between the two sidewalls 441. The drive shaft 460 forms left-hand and right-hand external threads on both sides with respect to the center point. The drive shaft 460 is provided with two thread-stopping rods 470 that respectively cooperate with the left-hand and right-hand external threads. A spacing control motor 480 is installed on the support 440 and is connected to the drive shaft 460.

[0112] In some preferred embodiments, the filament correction device 400 further includes a guide rod 450 fixed between two side walls 441, with the ends of two guide rods 470 passing through the guide rod 450. This makes the operation of the guide rods 470 more stable.

[0113] In some preferred embodiments, the guide rod 450 is located directly above the drive shaft 460.

[0114] In some implementations, the wide-area CCD vision sensor is electrically connected to the drive circuit of the servo motor 430 and the drive circuit of the spacing control motor 480.

[0115] In some preferred embodiments, two brackets 520 are provided, and the two brackets 520 are respectively fixed to both ends of the gas sealing device 510; multiple sets of filament correction devices 400 are provided between the two brackets 520. The multiple sets of filament correction devices 400 share the same rack and pinion guide rail 410.

[0116] Understandably, multiple sets of filament correction devices 400 can be installed at both ends of the furnace body 110 as needed, and these multiple sets of filament correction devices 400 can share the same rack and pinion guide rail 410, making the device more compact. A wide-area CCD vision sensor captures real-time images of the filament edge and identifies the deviation amount, filament width, and filament breakage through image algorithms. The rack and pinion guide rail 410 is installed above the filament, and the slider 420 on the rack and pinion guide rail 410 can move laterally with high precision under the drive of the servo motor 430 to automatically adjust the position of the misaligned fibers. Wire guide rods 470 with left- and right-hand internal threads are installed on a drive shaft 460 with left- and right-hand external threads. The ends of the wire guide rods 470 are threaded onto guide rods 450. A spacing control motor 480 is fixed to a bracket 440 and connected to the drive shaft 460. By driving the drive shaft 460 to rotate, the spacing between the two wire guide rods 470 is adjusted, thereby controlling the unfolding width of the filament.

[0117] In operation, the fiber bundle enters the carbonization furnace through the bundle inlet. A wide-area CCD vision sensor at the inlet captures real-time images of the bundle's edges. When a bundle misalignment is detected, a signal is transmitted to the servo motor drive circuit, which then controls the servo motor to move the slider laterally, correcting the misaligned bundle. Simultaneously, if the bundle width needs adjustment, a signal is sent to the spacing control motor drive circuit, which rotates the transmission shaft, thereby controlling the spacing between the two guide rods and adjusting the bundle unfolding width. The automatic correction system at the bundle outlet operates in the same manner and will not be described in detail here.

[0118] The carbonization furnace of this invention is equipped with an automatic deviation correction system. It uses a wide-area CCD vision sensor to capture real-time images of the fiber bundle edges. The image algorithm identifies the deviation amount, fiber bundle width, and fiber breakage, with an accuracy of ±0.2mm. By visually collecting the width, tension, and fiber breakage of the fiber bundles entering and exiting the high-temperature carbonization furnace, the system automatically corrects the fiber bundle width and position for products of different specifications, and provides real-time feedback and alarms on fiber breakage and position.

[0119] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A wide-width high-temperature carbonization furnace, characterized in that, The furnace includes a furnace body (110) and a furnace chamber (120). The furnace body (110) includes a shell (111) and an insulation layer (112) disposed inside the shell (111). The furnace chamber (120) is disposed inside the furnace body (110). The furnace chamber (120) is composed of a top plate (121), a bottom plate (122), and side plates (123) disposed on both sides of the top plate (121) and the bottom plate (122). The side plates (123) on both sides are connected to the bottom plate. (122) is connected at both ends; the side plate (123) is provided with a protrusion (1231) at one end away from the bottom plate (122), and the top plate (121) is provided with sliding grooves (1211) at both ends that are adapted to the protrusion (1231). The top plate (121) and the side plate (123) are engaged by the protrusion (1231) and the sliding groove (1211); the projection of the top plate (121) on the radial section of the furnace (120) is arched. The wide-width high-temperature carbonization furnace (100) further includes an ash collection chamber (310) with an open upper end, an open graphite scraper (320) that can at least completely cover the ash collection chamber (310), and a graphite scraper driving mechanism. The ash collection chamber (310) is located at the end of the wide-width high-temperature carbonization furnace (100) and extends radially through the furnace body (110). The ash collection chamber (310) has a spray port (311) and a suction port (312) communicating with the cavity of the ash collection chamber (310) on both sides of the furnace body (110). The ash collection chamber (310) is located at the bottom inside the furnace body (110). The graphite scraper (320) can be translated along the surface of the bottom plate (122).

2. The wide-width high-temperature carbonization furnace according to claim 1, characterized in that, The top plate (121), the bottom plate (122), and the side plate (123) each have several pieces and are spliced ​​together along the axial direction of the furnace (120); expansion joints (124) are provided at the connection between the top plate (121), between the bottom plate (122), and between the side plate (123), and the expansion joints (124) are filled with at least one of flexible graphite rope, carbon fiber rope, and boron nitride fiber rope.

3. A wide-width high-temperature carbonization furnace according to claim 2, characterized in that, The width of the expansion joint (124) is 2~3 mm. Along the axial direction of the furnace (120), the total width of the expansion joint (124) is not less than 0.5% of the total axial length of the top plate (121), the bottom plate (122), or the side plate (123); the expansion joint (124) is evenly distributed.

4. A wide-width high-temperature carbonization furnace according to claim 1, characterized in that, The thickness of the top plate (121) is 30-40 mm; the thickness of the side plate (123) is 2-3 times the thickness of the top plate (121).

5. A wide-width high-temperature carbonization furnace according to claim 1, characterized in that, The top plate (121), the bottom plate (122), and the side plate (123) are made of carbon / carbon composite material; the carbon / carbon composite material has a flexural strength ≥150 MPa and an elastic modulus ≥80 GPa.

6. A wide-width high-temperature carbonization furnace according to claim 1, characterized in that, The insulation layer (112) consists of a lightweight microporous calcium silicate board layer (1121), a silica aerogel layer (1122), and a graphite hard felt layer (1123) from the outside to the inside.

7. A wide-width high-temperature carbonization furnace according to claim 6, characterized in that, The thickness of the lightweight microporous calcium silicate plate layer (1121) is 20~40 mm; the thickness of the silica aerogel layer (1122) is 30~50 mm; and the thickness of the graphite hard felt layer (1123) is 100~150 mm.

8. A wide-width high-temperature carbonization furnace according to claim 1, characterized in that, Heating devices (125) are provided on both the upper and lower sides of the furnace (120). The heating devices (125) are composed of graphite electrodes (1251) and heating plates (1252) connected by graphite bolts (1253).

9. A wide-width high-temperature carbonization furnace according to claim 8, characterized in that, The heating plates (1252) on both sides of the top of the furnace (120) are placed at an angle along the arc of the top plate (121). The inclined heating plates (1252) are provided with an upper inclined pad (1254) and a lower inclined pad (1255) between them and the graphite electrode (1251) and the graphite bolt (1253).

10. A wide-width high-temperature carbonization furnace according to claim 8, characterized in that, Flanges (130) are welded to the top and bottom of the shell (111). The graphite electrode (1251) passes through the flange (130) and is inserted into the furnace body (110). A ceramic insulating sleeve (140) is threaded onto the outer circumference of the graphite electrode (1251). The flange (130) has a groove (131) along its inner circumference. The outer circumference of the ceramic insulating sleeve (140) has a flange (141) that fits into the groove (131). The shell also includes a cover (150). The cover (150) is hollow and has a cover plate (151) along its outer circumference. When the cover (150) passes through the graphite electrode (1251) and is fixedly connected to the flange (130), the cover plate (151) abuts against the flange (141).

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