An exhaust hood and exhaust device for the furnace opening of a carbonization furnace used in the production of carbon fiber.

Abstract

This invention provides an exhaust hood for the furnace opening of a carbonization furnace used in carbon fiber production, comprising an exhaust hood body, a movable insert plate, and a displacement controller. The upper end of the exhaust hood body is connected to an air duct, and the lower end is the hood opening, which is rectangular. The movable insert plate is movably connected to the hood opening. The length of the movable insert plate is not less than the length of the hood opening, and the width of the movable insert plate is not less than the width of the hood opening. One side of the movable insert plate is provided with a scale. The displacement controller is located on one side of the exhaust hood body, and the displacement controller is opposite to the scale. This invention, through the cooperation of the displacement controller and the movable insert plate, allows for adjustable airflow velocity at the hood opening under a given exhaust volume, and adjustable exhaust volume under a given airflow velocity at the hood opening, achieving precise airflow control and airflow velocity control at the airflow surface. Ultimately, it achieves the goal of removing toxic and harmful gases and carbon powder without causing vibration of the fiber bundles.

Description

Technical Field

[0001] This invention belongs to the field of HVAC engineering technology in petrochemical, chemical fiber, pharmaceutical, and thermal power plant industries, particularly for carbon fiber plants that generate high-temperature exhaust gases and require purification. Specifically, it relates to an exhaust hood for the furnace opening of a carbonization furnace used in carbon fiber production. Furthermore, this invention also relates to an exhaust device for the furnace opening of a carbonization furnace used in carbon fiber production. Background Technology

[0002] In the field of carbon fiber production, when fiber bundles enter and exit the carbonization furnace, toxic and harmful gases such as hydrogen sulfide and hydrogen cyanide will overflow from the furnace along with the fiber bundles, and a large amount of carbon powder will be generated. At the same time, the temperature of this waste gas is relatively high. Therefore, local exhaust hoods are installed at the inlet and outlet of the carbonization furnace to absorb the toxic and harmful high-temperature gases and carbon powder, and to protect the local environment for personnel operation. This is also in line with the people-oriented development concept.

[0003] During the production process, because the fiber bundles are very fine, small in diameter, and light in weight, external airflow can interfere with the transmission of the fiber bundles. When the wind speed on the suction surface of the furnace exhaust hood is high, it will cause the fiber surface to shake, resulting in a large number of broken fibers. When the wind speed on the suction surface of the furnace exhaust hood is low, the exhaust effect of waste gas and carbon powder is not good. Therefore, in actual production, it is necessary to adjust the exhaust effect of the hood, especially the wind speed on the suction surface, according to the process flow.

[0004] The current conventional approach for designers is to add a frequency converter to the exhaust fan. This approach allows for adjustment of the air velocity at the exhaust hood's suction surface. However, frequency converters are expensive, and an additional control logic is required for frequency adjustment, increasing project investment costs. Furthermore, due to the conductivity of toner, using a frequency converter in a toner-rich environment poses a short-circuit risk. Additionally, when toner is discharged through the exhaust duct, it adheres to the inner wall of the duct, requiring frequent cleaning by operators, resulting in a heavy workload. To address these issues, a design is needed that can adjust the airflow at the hood opening or the air velocity at the suction surface, achieving a reasonable exhaust effect based on the actual size and weight of the filament bundle, while simultaneously solving the cleaning problem. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art, so that the air velocity of the air intake surface of the hood can be adjusted under a certain air volume, and the air volume of the hood can be adjusted under a certain air velocity of the air intake surface of the hood, so as to remove toxic and harmful gases and carbon powder without causing the fiber bundle to shake, and to generate a good exhaust effect by utilizing the shielded airflow, while also making dust removal convenient.

[0006] This invention is achieved through the following technical solution:

[0007] One of the objectives of this invention is to provide an exhaust hood for the furnace opening of a carbonization furnace used in the production of carbon fiber, comprising:

[0008] The exhaust hood body has an upper end connected to the air duct and a lower end that is a hood opening; the hood opening is rectangular.

[0009] A movable insert plate is movably connected to the hood opening; the length of the movable insert plate is not less than the length of the hood opening, and the width of the movable insert plate is not less than the width of the hood opening; one side of the movable insert plate is provided with a scale.

[0010] A displacement controller is located on one side of the exhaust hood body; the displacement controller is opposite to the scale.

[0011] In a preferred embodiment of the present invention, the displacement controller includes:

[0012] An infrared detection component is configured to perform infrared imaging of the scale position of the movable insert and transmit it to a digital image recognition component.

[0013] A digital image recognition component is configured to receive the infrared image and identify the specific scale value corresponding to the movable insert.

[0014] The control processor is configured to receive the specific scale value of the movable insert, call the calculation module, and calculate the real-time airflow at the lower end of the exhaust hood or the air velocity at the suction surface of the hood.

[0015] In a preferred embodiment of the present invention, the displacement controller further includes a display module configured to receive and display the airflow at the hood opening or the air velocity at the hood opening suction surface transmitted by the control processor.

[0016] In a preferred embodiment of the present invention, the display module is configured to receive an instruction to set an operating mode and transmit it to the control processor.

[0017] In a preferred embodiment of the present invention, the exhaust hood for the furnace opening of the carbonization furnace for producing carbon fiber further includes:

[0018] Two shielding hoods are provided, one on each of the two opposite sides of the exhaust hood body; the shielding hoods and the sides of the exhaust hood body form a shielded airflow channel.

[0019] The number of shielded fans is two; the two shielded fans are respectively connected to two shielded airflow channels.

[0020] In a preferred embodiment of the present invention, the shielding fan is an EC fan.

[0021] In a preferred embodiment of the present invention, the exhaust hood for the furnace opening of the carbonization furnace for producing carbon fiber further includes a filter element disposed inside the air duct; the filter element is horizontally arranged.

[0022] In a preferred embodiment of the present invention, the filter element is detachably connected to the air duct.

[0023] The second objective of this invention is to provide an exhaust device for the furnace opening of a carbonization furnace for producing carbon fiber, comprising an exhaust fan, an air duct, and an exhaust hood for the furnace opening of a carbonization furnace for producing carbon fiber as described in the first objective of this invention; wherein, the upper end of the air duct is connected to the exhaust fan, and the lower end is connected to the upper end of the exhaust hood.

[0024] In a preferred embodiment of the present invention

[0025] The exhaust fan is a speed-regulating fan;

[0026] An air volume sensor is installed at the inlet of the exhaust fan. The air volume sensor is configured to detect the real-time air volume of the exhaust hood body and control the exhaust fan to adjust its speed according to the changes in the real-time air volume.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The present invention provides an exhaust hood for the furnace opening of a carbonization furnace used in the production of carbon fiber. Through the cooperation of a displacement controller and a movable insert plate, the exhaust volume of the hood opening is adjustable under a certain condition, and the exhaust volume of the hood opening is adjustable under a certain condition, thereby achieving precise control of air volume and air velocity of the air suction surface. Ultimately, this achieves the purpose of removing toxic and harmful gases and carbon powder without causing the fiber bundles to vibrate.

[0029] 2. The exhaust hood for the carbonization furnace opening of the carbon fiber production process of this invention can form a shielded airflow channel between the exhaust hood body and the shielded hood. The shielded airflow within this channel can create a negative pressure chamber at the furnace opening, preventing exhaust gas from overflowing. Simultaneously, the generated shielded airflow reduces entrainment airflow in the environment, greatly improving the exhaust effect, reducing the electrical load on the exhaust fan, and saving energy. At the same time, the shielded airflow does not affect the fiber bundles below the exhaust hood.

[0030] 2. The exhaust hood for the carbonization furnace opening of the carbonization furnace of the present invention is equipped with a detachable and washable filter element, which is convenient for cleaning and replacement. Attached Figure Description

[0031] Figure 1 This is a right sectional view of the exhaust hood for the carbonization furnace opening in the carbonization furnace used for producing carbon fiber according to the present invention.

[0032] Figure 2This is a front sectional view of the exhaust hood for the carbonization furnace opening used in the production of carbon fiber according to the present invention.

[0033] Figure 3 This is an overall structural diagram of the exhaust hood for the carbonization furnace opening in the carbonization furnace of the present invention.

[0034] In the diagram, 1-exhaust hood body; 2-filter; 3-movable insert plate; 4-displacement controller; 5-EC fan; 6-shielding hood. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] like Figures 1-3 As shown, this invention provides a special exhaust hood for exhausting air from a carbonization furnace opening, comprising: an exhaust hood body 1, a movable insert plate 3, and a displacement controller 4. Figure 3 As shown (Explanation:) Figure 3 (The shielding hood 6 is not shown in the diagram). In this embodiment, the upper end of the exhaust hood body 1 is connected to the air duct, and the lower end is the hood opening. The hood opening of the exhaust hood body 1 is rectangular, with two opposite sides corresponding to the long side and the other two opposite sides corresponding to the short side. The length of the movable insert 3 is not less than the length of the lower hood opening of the exhaust hood body 1, and the width of the movable insert 3 is not less than the width of the lower hood opening of the exhaust hood body 1. The movable insert 3 can fully cover the lower hood opening of the exhaust hood body 1.

[0037] Specifically, the movable insert 3 is movably connected to the opening at the lower end of the exhaust hood body 1, allowing the operator to adjust the extension and retraction of the movable insert 3, thereby adjusting the air intake area at the opening of the exhaust hood body 1 and ensuring the exhaust effect. In one embodiment of the present invention, the lower edges of the two opposite sides corresponding to the short side of the exhaust hood body 1 are provided with connecting grooves, and the two opposite sides of the movable insert 3 (in this embodiment, both opposite sides are short sides) are provided with plug-in members, which match the connecting grooves, thereby realizing the movable connection between the movable insert 3 and the exhaust hood body 1. It should be noted that this movable connection method does not constitute a limitation of the present invention; the movable connection of the movable insert 3 to the two opposite sides corresponding to the short side of the exhaust hood body 1 also does not constitute a limitation of the present invention.

[0038] The movable insert plate 3 has a scale on one of its short sides, which is used by the displacement controller 4 to identify the scale and calculate the real-time airflow or air velocity at the hood opening. The displacement controller 4 is located on one side of the exhaust hood body 1 and corresponds to the scale on the movable insert plate 3. The displacement controller 4 can automatically identify the extension and retraction of the movable insert plate 3 and can calculate the area of ​​the lower opening of the exhaust hood body 1 (i.e., the air intake area of ​​the exhaust hood body 1), and thus calculate the real-time airflow or air velocity at the hood opening.

[0039] In one embodiment of the present invention, the displacement controller 4 includes an infrared detection component, a digital image recognition component, and a control processor. The infrared detection component is configured to perform infrared imaging on the scale position of the movable insert 3 and transmit the image to the digital image recognition component; specifically, the infrared detection component is equipped with a probe to image the scale of the movable insert 3 using the infrared imaging principle. The digital image recognition component is configured to receive the infrared image and identify the specific scale value corresponding to the movable insert 3, which is the width of the opening at the lower end of the exhaust hood body 1, i.e., the extension / retraction amount of the movable insert 3. The control processor is configured to receive the specific scale value of the movable insert 3, call the calculation module, calculate the area of ​​the opening at the lower end of the exhaust hood body 1 (i.e., the air intake area of ​​the exhaust hood body 1), and then calculate the real-time airflow or air velocity at the air intake surface. It should be noted that the air intake area of ​​the exhaust hood body 1 is the width of the lower end of the exhaust hood body 1 opening multiplied by the length of the lower end of the exhaust hood body 1 opening.

[0040] Specifically, when the operator manually adjusts the extension / retraction of the movable insert 3, the infrared detection component can identify the position of the movable insert 3 and transmit it to the digital image recognition component. The digital image recognition component receives the position of the movable insert 3, obtains the specific scale value corresponding to the movable insert 3, and transmits it to the control processor. The control processor receives the specific scale value corresponding to the movable insert 3, calls the calculation module, calculates the air intake area of ​​the exhaust hood body 1, and performs real-time calculation of the air velocity or air volume of the hood intake surface based on the air intake area.

[0041] The airflow at the hood opening of exhaust hood body 1 is calculated as follows: Airflow = Air intake area of ​​exhaust hood body 1 × Air velocity at the air intake surface of exhaust hood body 1. In constant airflow mode (i.e., the air velocity at the air intake surface of exhaust hood body 1 is constant), the air velocity is preset and known. The calculation module multiplies the preset air velocity at the air intake surface by the air intake area to obtain the airflow at the hood opening. It should be noted that the airflow obtained by the calculation module changes in real time during the adjustment of the movable insert 3. This airflow helps the operator adjust the extension / retraction of the movable insert 3, thereby adjusting the air intake area of ​​the hood opening and ultimately regulating the airflow at the hood opening to ensure effective ventilation. In constant airflow mode (i.e., the airflow at the hood opening of exhaust hood body 1 is constant), the airflow is preset and known. The calculation module divides the preset airflow by the air intake area to obtain the air velocity at the air intake surface. The suction surface wind speed is used to help the operator adjust the extension and retraction of the movable insert plate 3. By adjusting the extension and retraction of the movable insert plate 3, the suction surface wind speed of the exhaust hood body 1 can be adjusted (i.e., the suction force of the suction surface is adjusted) to ensure the exhaust effect.

[0042] In a preferred embodiment of the present invention, the displacement controller 4 is equipped with a display module, which is configured to receive the airflow at the hood opening of the exhaust hood body 1 or the air velocity at the suction surface of the exhaust hood body 1 calculated by the control processor, and to display the airflow and suction surface velocity. The operator can more intuitively observe the current airflow and suction surface velocity, and adjust the extension / retraction of the movable insert 3 accordingly. Furthermore, the display module of the displacement controller 4 is also configured to receive instructions from the operator to set the operating mode. The exhaust hood for the carbonization furnace opening of the carbon fiber production furnace of the present invention has two operating modes: a constant airflow control mode and a constant air velocity control mode. It should be noted that when receiving instructions to set the operating mode, the setting of the air velocity or airflow value is also received. For example, when receiving a constant airflow control mode instruction, the specific value of the airflow is set.

[0043] The specialized exhaust hood for carbonization furnace ventilation can operate in two modes. Before introducing the two modes, it should be noted that the carbonization furnace opening in the carbon fiber industry is a source of pollution. Toxic and harmful gas detectors are installed around the furnace opening, and an alarm will be automatically triggered when the concentration of harmful gases exceeds the standard.

[0044] The first operating mode – constant air volume control mode

[0045] In this mode, the frequency of the external exhaust fan is constant, thus the airflow at the opening of the exhaust hood body 1 is constant. By adjusting the extension and retraction of the movable insert 3, the suction area of ​​the exhaust hood body 1 opening is changed, thereby altering the suction surface velocity of the exhaust hood body 1 opening and consequently affecting the exhaust effect. Specifically, with a constant airflow at the opening of the exhaust hood body 1, a higher suction surface velocity is more beneficial for improving the exhaust effect. Since the suction volume of the exhaust hood body 1 opening = suction area of ​​the exhaust hood body 1 opening × suction surface velocity of the exhaust hood body 1 opening, a higher suction surface velocity results in a smaller suction area for the exhaust hood body 1. Simultaneously, toxic and harmful gas detectors are installed around the furnace opening; when the concentration of harmful gases exceeds the standard, an automatic alarm will sound. Furthermore, when the suction surface velocity at the opening of the exhaust hood body 1 opening is high, it will cause the yarn surface to vibrate, resulting in a large number of broken yarns.

[0046] Therefore, in constant airflow control mode, the suction area of ​​the exhaust hood's opening 1 should not be too large; otherwise, insufficient air velocity at the suction surface and poor exhaust effect will lead to excessive concentration of harmful gases, triggering an automatic alarm from the toxic and harmful gas detector. Simultaneously, the suction area of ​​the exhaust hood's opening 1 should not be too small; otherwise, excessive air velocity at the suction surface will cause yarn vibration, resulting in numerous yarn breaks. In constant airflow control mode, the optimal exhaust effect is achieved by satisfying three conditions: first, not triggering an automatic alarm from the toxic and harmful gas detector; second, not causing yarn vibration; and third, maximizing the air velocity at the suction surface while meeting the first two conditions.

[0047] In actual operation, the initial suction area of ​​the exhaust hood body 1 is relatively large. At this time, the air velocity at the suction surface is low, the suction force is weak, the exhaust effect is poor, and the level of toxic and harmful gases exceeds the standard, triggering an automatic alarm from the toxic and harmful gas detector. The displacement controller 4 obtains the extension and retraction amount of the movable insert 3 and calculates the current air velocity at the suction surface based on this (since this mode is a constant air volume control mode, the displacement controller 4 always displays this fixed air volume). At this time, the operator observes the air volume and air velocity at the suction surface displayed by the displacement controller 4 and slowly moves the movable insert 3 to reduce the suction area of ​​the exhaust hood body 1. As the suction area at the opening of the exhaust hood body 1 gradually decreases, the air velocity at the suction surface gradually increases, the suction force is enhanced, and the exhaust effect becomes better and better. When the movable insert 3 moves to a certain position, the toxic and harmful gas detector no longer alarms, and the suction area of ​​the exhaust hood body 1 can be further reduced to further enhance the exhaust effect. When the movable insert 3 moves to a certain position, the filament begins to vibrate. At this point, increase the suction area of ​​the exhaust hood body 1 until the filament surface stops vibrating. When the toxic and hazardous detectors no longer alarm and the filament surface stops vibrating, the suction surface wind speed at this point is the optimal suction surface wind speed, resulting in the best exhaust effect.

[0048] If the filaments are very fine, the toxic and hazardous detectors may start to vibrate while the suction area of ​​the exhaust hood body 1 is being reduced. In this case, another exhaust hood body 1 can be added to ensure the exhaust effect. The process of seeking the optimal exhaust effect is the same as described above and will not be repeated here.

[0049] The constant air volume control mode is mainly used when the capacity of the exhaust gas treatment equipment is fixed. By adjusting the extension and retraction of the movable baffle 3, the air velocity at the suction surface of the exhaust hood body 1 is changed to find the optimal solution for exhaust effect. In particular, when the filament bundle below the hood body 1 is very fine, the air velocity at the suction surface of the hood opening cannot be too high.

[0050] The second operating mode – constant wind speed control mode

[0051] In this mode, the air velocity at the suction surface of the exhaust hood body 1 remains constant. By adjusting the extension and retraction of the movable insert 3, the suction area of ​​the exhaust hood body 1's opening is changed, thereby adjusting the airflow at the opening of the exhaust hood body 1 and thus affecting the exhaust effect. In this mode, the external exhaust fan must be a speed-regulating fan. It should be noted that the exhaust fan connected to the exhaust hood body 1 has an airflow sensor at its inlet. When the displacement controller 4 is set to constant speed control mode, the airflow sensor starts operating. The airflow sensor is configured to detect the real-time airflow of the exhaust hood body 1 and to control the speed of the exhaust fan based on changes in the real-time airflow. That is, as the extension and retraction of the movable insert 3 changes, the airflow sensor controls the speed of the exhaust fan based on the changes in the real-time airflow to maintain a constant air velocity at the suction surface of the exhaust hood body 1. This speed-regulating fan and airflow sensor are commercially available products.

[0052] This mode is particularly suitable for situations where the vertical distance between the fiber bundle surface and the hood opening is unknown, or where this distance deviates from the design distance due to on-site assembly issues. When the vertical distance between the fiber bundle surface and the hood opening is unknown, the higher the installation position of the exhaust hood body 1, the larger the air intake area of ​​the hood opening needs to be for exhaust, preventing the concentration of harmful gases from exceeding the standard and triggering an automatic alarm from the toxic and harmful gas detector. Similarly, when this distance deviates from the design distance due to on-site assembly issues, it is also necessary to increase the air intake area of ​​the exhaust hood body 1's hood opening for exhaust to prevent the concentration of harmful gases from exceeding the standard and triggering an automatic alarm from the toxic and harmful gas detector.

[0053] Specifically, when the air velocity at the suction surface is constant, a larger suction area at the opening of the exhaust hood body 1 is more conducive to improving the exhaust effect. This is because the air volume at the opening of the exhaust hood body 1 = the suction area at the opening of the exhaust hood body 1 × the air velocity at the suction surface of the exhaust hood body 1. Therefore, the larger the suction area at the opening of the exhaust hood body 1, the larger the area it can cover downwards, the larger the air volume at the opening of the exhaust hood body 1, and the lower the concentration of harmful gases.

[0054] Therefore, the air intake area of ​​the exhaust hood body 1 should not be too small; otherwise, insufficient coverage and poor exhaust effect will lead to excessive concentration of harmful gases, triggering an automatic alarm from the toxic and harmful gas detector. Simultaneously, the air intake area of ​​the exhaust hood body 1 should not be too large; otherwise, it will increase the consumption of the multi-speed adjustable exhaust fan. In constant speed control mode, the optimal exhaust effect is achieved by simultaneously avoiding triggering the automatic alarm of the toxic and harmful gas detector and minimizing the consumption of the exhaust fan.

[0055] In actual operation, the initial suction area of ​​the exhaust hood body 1 is relatively small. At this time, the suction area coverage of the exhaust hood body 1 is small, resulting in poor ventilation and excessive levels of toxic and harmful gases, triggering an automatic alarm from the toxic and harmful gas detector. The displacement controller 4 acquires the extension / retraction amount of the movable insert 3 and calculates the current airflow accordingly (since this is a constant wind speed control mode, the displacement controller 4 continuously displays the fixed airflow velocity at the suction surface). At this point, the operator observes the airflow and airflow velocity displayed on the displacement controller 4 and slowly moves the movable insert 3 to increase the suction area of ​​the exhaust hood body 1. As the suction area of ​​the exhaust hood body 1 gradually increases, the coverage of the suction area gradually increases, and the ventilation effect becomes increasingly better. When the movable insert 3 moves to a certain position, the toxic and harmful gas detector no longer alarms, indicating that the suction area of ​​the exhaust hood body 1 at this point is the optimal suction area, achieving the best ventilation effect while minimizing the power consumption of the exhaust fan.

[0056] In a preferred embodiment of the present invention, a special exhaust hood for exhausting air from the carbonization furnace opening includes a shielding hood 6, which is sleeved on the outside of both sides of the exhaust hood body 1 (e.g., Figure 1 As shown), the shielding hood 6 is not connected to the duct. Two air outlets are formed between the lower end of the shielding hood 6 and the lower ends of the two sides of the two corresponding short sides of the exhaust hood body 1. The length direction of the two air outlets is parallel to the direction of movement of the filament bundle. A shielded airflow channel is formed between the exhaust hood body 1 and the shielding hood 6. A shielding fan is installed on the shielding hood 6, and the shielding airflow channel is connected to the shielding fan, which generates a downward-flowing shielding airflow (such as...). Figure 2As shown), this shielded airflow can create a negative pressure chamber at the furnace opening (i.e., inside the exhaust hood body 1) to prevent exhaust gas from overflowing, and it can also reduce the entrainment airflow in the environment, greatly improving the exhaust effect. The downward-flowing shielded airflow exits at the two opposite sides of the short side of the exhaust hood body 1, while there is no airflow at the two opposite sides of the long side of the exhaust hood body 1, which will not affect the filament bundle. This is because the forward direction of the filament bundle is parallel to the two opposite sides of the short side of the exhaust hood body 1. If airflow were also exited at the two opposite sides of the long side of the exhaust hood body 1, it would cause the filament bundle to sway towards those two sides. Specifically... Figure 1 The middle section describes the back-and-forth movement of the filament bundle, which can cause filament breakage. It should be noted that... Figure 2 The location of the shielding fan does not constitute a limitation of the present invention, as long as it can maintain positive pressure within the shielding airflow channel, i.e., greater than standard atmospheric pressure. More preferably, the shielding fan is an EC fan 5, which not only operates quietly but also has low noise and low vibration, and will not affect the filament bundle.

[0057] In another preferred embodiment of the present invention, the special exhaust hood for exhausting air from the carbonization furnace further includes a filter element 2. The filter element 2 is disposed inside the duct above the exhaust hood body 1. The filter element 2 is horizontally positioned. Preferably, the filter element 2 is detachably connected to the duct, facilitating cleaning, dust removal, and replacement of the filter element 2, and saving costs. In this embodiment, the filter element 2 is a pull-out pre-filter. After a period of use, the operator can pull out the pre-filter, clean it, and then reinsert it into the duct for continued use.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. An exhaust hood for a furnace mouth of a carbonization furnace for producing carbon fibers, characterized by: The exhaust hood body is communicated with the air pipe at the upper end and has a hood opening at the lower end; the hood opening is rectangular; the exhaust hood body further comprises two shielding hoods and two shielding fans; the two shielding hoods are respectively arranged outside the two opposite sides of the exhaust hood body; the shielding hoods and the sides of the exhaust hood body form shielding air flow channels; the two shielding fans are respectively communicated with the two shielding air flow channels; The movable plug-in plate is movably connected to the hood opening; the length of the movable plug-in plate is not less than the length of the hood opening, and the width of the movable plug-in plate is not less than the width of the hood opening; one side of the movable plug-in plate is provided with a scale; The displacement controller is arranged on one side of the exhaust hood body; the displacement controller is opposite to the scale; the displacement controller comprises an infrared detection component, a digital image recognition component and a control processor; the infrared detection component is configured to perform infrared imaging on the scale position of the movable plug-in plate and transmit the infrared imaging to the digital image recognition component; the digital image recognition component is configured to receive the infrared imaging and identify the specific scale value corresponding to the movable plug-in plate; the control processor is configured to receive the specific scale value of the movable plug-in plate, call a calculation module and calculate the real-time hood opening air volume or the hood opening suction surface wind speed of the exhaust hood body.

2. The exhaust hood for the furnace opening of the carbonization furnace for producing carbon fibers according to claim 1, characterized in that: The displacement controller further comprises a display module configured to receive and display the hood opening air volume or the hood opening suction surface wind speed transmitted by the control processor.

3. The exhaust hood for the furnace opening of the carbonization furnace for producing carbon fibers according to claim 2, characterized in that: The display module is configured to receive an instruction for setting an operation mode and transmit the instruction to the control processor.

4. The exhaust hood for the furnace opening of the carbonization furnace for producing carbon fibers according to claim 1, characterized in that: The shielding fan is an EC fan.

5. The exhaust hood for the furnace opening of the carbonization furnace for producing carbon fibers according to claim 1, characterized in that: Further comprising a filter arranged inside the air pipe; the filter is arranged horizontally.

6. The exhaust hood for the furnace opening of the carbonization furnace for producing carbon fibers according to claim 5, characterized in that: The filter is detachably connected to the air pipe.

8. The exhaust device for the furnace opening of the carbonization furnace for producing carbon fibers according to claim 7, characterized in that:

7. An exhaust device for a furnace mouth of a carbonization furnace for producing carbon fibers, characterized by: The exhaust fan is a speed-regulating fan; An air volume sensor is arranged at the inlet of the exhaust fan; the air volume sensor is configured to detect the real-time air volume of the exhaust hood body and control the speed-regulating fan according to the change of the real-time air volume. ​ ​

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