Viscose-based fiber carbonization method and carbonization furnace

Abstract

The invention belongs to the field of viscose-based fiber carbonization, and relates to a viscose-based fiber carbonization method and a carbonization furnace, which can improve the temperature control precision when a viscose-based fiber felt is carbonized, and prevent the product quality from being influenced by over-high carbonization temperature. According to the technical scheme, the device comprises a partition plate, a radiation heating pipe, a regulation and control assembly, a heating plate, a conveying roller set and a temperature sensor. And the plurality of partition plates are arranged along the radiation heating area. And a radiation heating pipe is arranged at the upper part of the radiation heating area between two adjacent partition plates. A regulation and control assembly is arranged under each radiation heating pipe, and the regulation and control assembly is configured to control the corresponding radiation heating pipe to illuminate the area under the radiation heating pipe. A heating plate is fixed under each regulation and control assembly, and the heating plates receive light from the radiation heating pipes over the heating plates. And a conveying roller group is arranged below the plurality of partition plates along the radiation heating area. And a temperature sensor is fixed at the lower part of each partition plate.

Description

Technical Field

[0001] The invention belongs to the field of viscose-based fiber carbonization and relates to a viscose-based fiber carbonization method and a carbonization furnace. Background Art

[0002] Viscose fiber (regenerated cellulose fiber) is carbonized at high temperature in an inert atmosphere to produce viscose-based fiber carbonization products, which have the characteristics of high carbon content, rich pore structure, good conductivity, high temperature resistance, chemical stability and green and renewable sources. It plays a diverse and important role in many fields such as environmental protection, energy, materials, biomedicine, etc.

[0003] The viscose fiber carbonization process primarily includes pre-oxidation, low-temperature carbonization, high-temperature carbonization, and surface modification. During low-temperature carbonization, the carbonization temperature ranges from 200°C to 600°C, with a heating rate of 1°C / min to 3°C. Excessively fast or slow heating rates can significantly impact final product quality. For example, during the low-temperature carbonization of viscose fiber felt, improper temperature control can cause uneven fiber shrinkage, leading to warping, wrinkling, and even delamination.

[0004] Current continuous carbonization furnaces mostly use resistors or silicon carbide rods for heating. By controlling the current, the heating power can be effectively controlled. However, the resistors or silicon carbide rods store a lot of heat during operation. Therefore, even if the resistors or silicon carbide rods stop working, the carbonization temperature will continue to rise under the carbonization furnace's heat preservation environment, making it difficult to control the temperature inside the carbonization furnace.

[0005] In addition, due to seasonal changes, the temperature of the carbonization furnace's working environment varies greatly. Although the carbonization furnace itself has an insulation layer, the heat dissipation efficiency of the carbonization furnace is different when working at high temperatures and for long periods of time, making high-precision temperature control of different areas inside the carbonization furnace more difficult. Summary of the Invention

[0006] In order to overcome the defects in the above-mentioned related technologies, the present invention proposes a viscose-based fiber carbonization furnace, which can improve the temperature control accuracy during the carbonization of viscose-based fiber felt and avoid the impact of excessive carbonization temperature on product quality.

[0007] To achieve the above technical objectives, the present invention provides a viscose-based fiber carbonization furnace. The viscose-based fiber carbonization furnace includes a carbonization furnace body, which is a long hollow member and includes a radiation heating zone; The radiant heating zone includes: a partition plate, a radiant heating tube, a control component, a heating plate, a conveying roller group and a temperature sensor. A plurality of partition plates are arranged along the radiant heating zone. A radiant heating tube is provided at the upper portion of the radiant heating zone between two adjacent partition plates. A control component is provided directly below each radiant heating tube, and the control component is configured to control the illumination area of ​​the corresponding radiant heating tube directly below. A heating plate is fixed directly below each control component, and the heating plate receives illumination from the radiant heating tube directly above it. A conveying roller group is provided along the radiant heating zone below the plurality of partition plates. A temperature sensor is fixed at the lower portion of each partition plate.

[0008] Preferably, the partition plate is made of thermal insulation ceramic, and the lower end of the partition plate is 3 to 5 cm away from the conveying roller group.

[0009] Preferably, the control assembly includes: a control plate, a worm gear, a worm, and a stepper motor. The control plate is a long strip of plate, and the extension direction of the control plate is perpendicular to the extension direction of the radiant heating zone. A plurality of control plates are arranged between two adjacent partitions, and the plurality of control plates are arranged in sequence on a horizontal plane, and the two ends of the plurality of control plates are connected to the outer shell of the radiant heating zone through bearings. A central axis extends from one end of each control plate to the outside of the outer shell of the radiant heating zone, and each central axis is coaxially fixedly connected to a worm gear. A plurality of worm gears are coaxially fixedly connected, and each worm gear is meshed with a corresponding worm gear. The output shaft of the stepper motor is coaxially fixedly connected to the worm gear.

[0010] Preferably, the heating plate is a silicon carbide plate with a black surface.

[0011] Preferably, the radiation heating zone also includes a protective gas nozzle, and multiple protective gas nozzles are fixed on the outer shell of the radiation heating zone from the bottom of each partition plate to the top of the conveying roller group. The multiple protective gas nozzles fill the radiation heating zone with protective gas and isolate the heat conduction from the bottom of the partition plate to the area above the conveying roller group.

[0012] Preferably, the power of the radiation heating tube increases gradually from the inlet end to the outlet end of the radiation heating zone.

[0013] Preferably, the temperature difference between two adjacent partition plates is less than 5° C., and the temperature increases gradually from the inlet to the outlet of the radiation heating zone. The height of the heating plate from the conveying roller group is adapted to the temperature collected by the corresponding temperature sensor.

[0014] On the other hand, the present invention also provides a viscose-based fiber carbonization method applicable to the viscose-based fiber carbonization furnace described above, the viscose-based fiber carbonization method comprising: the viscose-based fiber enters the viscose-based fiber carbonization furnace after a pre-oxidation stage. The temperature of the area between the initial two partitions in the radiant heating zone is 300°C to 305°C. From the initial two partitions to the outlet end of the radiant heating tube, the temperature of the area between each two adjacent partitions increases by 3°C to 5°C. Within one minute, the viscose-based fiber is transported three times the area between the two partitions. When the temperature fluctuation of the area between two adjacent partitions exceeds the corresponding threshold, the control component is used to reduce the illumination area of ​​the radiant heating tube to the corresponding heating plate, so that the temperature of the area between the two adjacent partitions fluctuates within the corresponding threshold range.

[0015] Preferably, the viscose-based fiber carbonization method also includes adjusting the height of the heating plate in the radiation heating zone. The method for adjusting the height of the heating plate in the radiation heating zone includes: selecting the lowest temperature state of the space where the viscose-based fiber carbonization furnace is located, starting the radiation heating tube, and adjusting the height of the heating plate so that the temperature of the area between two adjacent partition plates is within the corresponding threshold range.

[0016] The beneficial effects of the present invention are: The present invention adopts a partition plate to achieve temperature zoning, avoid temperature conduction within the entire radiation heating area, and reduce the difficulty of temperature control.

[0017] The present invention adopts a radiation heating tube and a regulating component. The radiation heating tube uses gas as energy, has the advantages of low energy consumption and environmental protection, and the regulating component can make up for the defect of inconvenient power control of the radiation heating tube.

[0018] The present invention adopts a regulating component to control the heating power of the heating plate, thereby ensuring that the heating plate heats the viscose-based fibers thereunder evenly and controlling the heating temperature of the viscose-based fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural diagram of the present invention; Figure 2 is a structural diagram of the control component of the present invention; Figure 3 This is a structural diagram of the threaded rod and the height-adjusting stepping motor of the present invention. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0024] like Figures 1 to 3 The present invention provides a viscose-based fiber carbonization furnace. The viscose-based fiber carbonization furnace comprises a carbonization furnace body, which is a long hollow member and includes a radiation heating zone; The radiation heating zone includes: a partition plate 1, a radiation heating tube 2, a regulating component 3, a heating plate 4, a conveying roller group 5 and a temperature sensor 6. A plurality of partition plates 1 are arranged along the radiation heating zone. A radiation heating tube 2 is arranged on the upper part of the radiation heating zone between two adjacent partition plates 1. A regulating component 3 is arranged directly below each radiation heating tube 2, and the regulating component 3 is configured to control the illumination area of ​​the corresponding radiation heating tube 2 directly below. A heating plate 4 is fixed directly below each regulating component 3, and the heating plate 4 receives illumination from the radiation heating tube 2 directly above it. A conveying roller group 5 is arranged along the radiation heating zone below the plurality of partition plates 1. A temperature sensor 6 is fixed at the bottom of each partition plate 1.

[0025] The partition plate 1 is made of thermal insulation ceramics, and the lower end of the partition plate 1 is 53-5 cm away from the conveying roller group.

[0026] The control assembly 3 includes: a control plate 31, a worm wheel 32, a worm 33 and a stepper motor 34. The control plate 31 is a long plate. The extension direction of the control plate 31 is perpendicular to the extension direction of the radiation heating zone. A plurality of control plates 31 are arranged between two adjacent partition plates 1. The plurality of control plates 31 are arranged in sequence on a horizontal plane, and the two ends of the plurality of control plates 31 are connected to the outer shell of the radiation heating zone through bearings. A central axis extends from one end of each control plate 31 to the outside of the outer shell of the radiation heating zone, and each central axis is coaxially fixedly connected to a worm wheel 32. A plurality of worms 33 are coaxially fixedly connected, and each worm 33 is engaged with a corresponding worm wheel 32. The output shaft of the stepper motor 34 is coaxially fixedly connected to the worm 33.

[0027] The heating plate 4 is a silicon carbide plate with a black surface.

[0028] The radiation heating zone also includes a protective gas nozzle. Multiple protective gas nozzles are fixed on the outer shell of the radiation heating zone from the bottom of each partition plate 1 to the top of the conveying roller group 5. The multiple protective gas nozzles fill the radiation heating zone with protective gas and isolate the heat conduction from the bottom of the partition plate 1 to the top of the conveying roller group 5.

[0029] The power of the radiation heating tube 2 increases gradually from the inlet end to the outlet end of the radiation heating zone.

[0030] The temperature difference between two adjacent partition plates 1 is less than 5°C, and the temperature increases gradually from the inlet to the outlet of the radiation heating zone. The height of the heating plate 4 from the conveying roller group 5 is adapted to the temperature collected by the corresponding temperature sensor 6.

[0031] In some embodiments, the present invention further includes a threaded rod 35 and a height-adjusting stepper motor 36. A vertical slot is provided on each side of the partition plate 1, with a threaded rod 35 positioned within the slot. The lower end of the threaded rod 35 is connected to the lower portion of the partition plate 1 via a bearing, and the upper portion of the threaded rod 35 extends through the housing. Each threaded rod 35 located within the housing is provided with a nut, and the two ends of the heating plate 4 are fixedly connected to the nuts on the corresponding two threaded rods 35. Each threaded rod 35 located outside the housing in the radiant heating zone is also connected to a height-adjusting stepper motor 36.

[0032] The threaded rod 35 and the height-adjusting stepper motor 36 can adjust the height of the heating plate 4. When the temperature inside the radiation heating zone rises too quickly and cannot be controlled, the height of the heating plate 4 can be adjusted to quickly reduce the heating rate to avoid excessive carbonization temperature affecting the product quality of the viscose-based fiber felt.

[0033] On the other hand, the present invention also provides a viscose-based fiber carbonization method, which is applicable to the above-mentioned viscose-based fiber carbonization furnace, and the viscose-based fiber carbonization method comprises: The viscose-based fibers enter the viscose-based fiber carbonization furnace after the pre-oxidation stage.

[0034] The temperature of the area between the initial two partition plates 1 in the radiation heating zone is 300°C~305°C. From the initial two partition plates 1 to the outlet end of the radiation heating tube 2, the temperature of the area between each adjacent two partition plates 1 increases by 3~5°C. Per minute, the transmission distance of the viscose-based fiber is the area between three groups of two partition plates 1.

[0035] When the temperature fluctuation of the area between two adjacent partition plates 1 is greater than the corresponding threshold, the control component 3 is used to reduce the illumination area of ​​the radiation heating tube 2 to the corresponding heating plate 4, so that the temperature of the area between the two adjacent partition plates 1 fluctuates within the corresponding threshold range.

[0036] The viscose-based fiber carbonization method also includes adjusting the height of the heating plate 4 in the radiation heating zone. The method for adjusting the height of the heating plate 4 in the radiation heating zone includes: selecting the lowest temperature state of the space where the viscose-based fiber carbonization furnace is located, starting the radiation heating tube 2, and adjusting the height of the heating plate 4 so that the temperature of the area between two adjacent partition plates 1 is within the corresponding threshold range.

[0037] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A viscose-based fiber carbonization furnace, characterized in that: The viscose-based fiber carbonization furnace includes a carbonization furnace body, which is a long hollow piece and includes a radiation heating zone; The radiant heating zone comprises: A partition plate, wherein a plurality of partition plates are arranged along the radiation heating area; A radiation heating tube is provided on the upper portion of the radiation heating zone between two adjacent partition plates; A regulating component is provided directly below each radiant heating tube, and the regulating component is configured to control the illumination area directly below the corresponding radiant heating tube; A heating plate is fixed directly below each regulating assembly, and the heating plate receives light from the radiant heating tube directly above it; A conveying roller group is arranged below the plurality of partition plates along the radiation heating area; Temperature sensor: a temperature sensor is fixed at the lower part of each partition plate.

2. The viscose-based fiber carbonization furnace according to claim 1, characterized in that: The partition plate is made of thermal insulation ceramics, and the lower end of the partition plate is 3 to 5 cm away from the conveying roller group.

3. The viscose-based fiber carbonization furnace according to claim 2, characterized in that: The control components include: A control plate, wherein the control plate is a long plate, the extension direction of the control plate is perpendicular to the extension direction of the radiant heating zone, a plurality of control plates are provided between two adjacent partition plates, the plurality of control plates are arranged in sequence on a horizontal plane, and both ends of the plurality of control plates are connected to the outer shell of the radiant heating zone through bearings; A worm gear, wherein one end of each control plate extends a central axis toward the outside of the outer shell of the radiation heating zone, and each central axis is coaxially and fixedly connected to a worm gear; Worm, multiple worms are coaxially fixedly connected, and each worm is engaged with a corresponding worm wheel; A stepper motor, wherein the output shaft of the stepper motor is coaxially fixedly connected to the worm.

4. The viscose-based fiber carbonization furnace according to claim 3, characterized in that: The heating plate is a silicon carbide plate with a black surface.

5. The viscose-based fiber carbonization furnace according to claim 4, characterized in that: The radiation heating zone also includes a protective gas nozzle. Multiple protective gas nozzles are fixed on the outer shell of the radiation heating zone from below each partition plate to above the conveying roller group. The multiple protective gas nozzles fill the radiation heating zone with protective gas and isolate the heat conduction from the below the partition plate to the area above the conveying roller group.

6. The viscose-based fiber carbonization furnace according to claim 5, characterized in that: The power of the radiation heating tube increases gradually from the inlet end to the outlet end of the radiation heating zone.

7. The viscose-based fiber carbonization furnace according to claim 6, characterized in that: The temperature difference between two adjacent partitions is less than 5°C, and the temperature increases gradually from the inlet to the outlet of the radiation heating zone; The height of the heating plate from the conveying roller group is adapted to the temperature collected by the corresponding temperature sensor.

8. A viscose-based fiber carbonization method, suitable for use in the viscose-based fiber carbonization furnace according to claims 1 to 5, the viscose-based fiber carbonization method comprising: The viscose-based fibers enter the viscose-based fiber carbonization furnace after the pre-oxidation stage; The temperature of the area between the first two partitions in the radiation heating zone is 300°C to 305°C. From the first two partitions to the outlet end of the radiation heating tube, the temperature of the area between each two adjacent partitions increases by 3°C to 5°C. The viscose-based fiber is conveyed at a distance of three groups of partitions per minute. When the temperature fluctuation of the area between two adjacent partition plates is greater than the corresponding threshold, the control component is used to reduce the illumination area of ​​the radiation heating tube to the corresponding heating plate, so that the temperature of the area between the two adjacent partition plates fluctuates within the corresponding threshold range.

9. The method for carbonizing viscose-based fibers according to claim 8, characterized in that: The viscose-based fiber carbonization method further includes adjusting the height of the heating plate in the radiation heating zone, and the method for adjusting the height of the heating plate in the radiation heating zone includes: Select the lowest temperature state of the space where the viscose-based fiber carbonization furnace is located, start the radiation heating tube, and adjust the height of the heating plate so that the temperature of the area between two adjacent partition plates is within the corresponding threshold range.

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