CN219059229U - Carbonization line oxidation furnace system - Google Patents

Abstract

The utility model discloses a carbonization line oxidation furnace system, which comprises an oxidation furnace, wherein an outlet and an inlet for a filament bundle to pass through are formed in the oxidation furnace, and the carbonization line oxidation furnace system also comprises an airtight air duct, an air inlet end and an air supply end, wherein the air inlet end is communicated with the oxidation furnace and used for guiding out hot air in the oxidation furnace, and the air supply end is arranged at the outlet end and/or the inlet end of the oxidation furnace and used for supplying air into the oxidation furnace. According to the utility model, the air supply end of the airtight air duct is arranged at the outlet end and/or the inlet end of the oxidation furnace, so that the air flowing through the airtight air duct forms high-pressure air flow, and the high-pressure air flow is conveyed back into the oxidation furnace through the air supply end, thereby avoiding leakage of the air flow with higher temperature inside the oxidation furnace, which is toxic and harmful, to the outside and preventing cold air outside the oxidation furnace from entering the furnace, ensuring more uniform temperature inside the oxidation furnace, achieving the sealing effect and ensuring the intrinsic safety of production.

Description

Carbonization line oxidation furnace system

Technical Field

The utility model belongs to the field of carbon fiber production, and particularly relates to a carbonization line oxidation furnace system.

Background

Polyacrylonitrile (PAN) -based carbon fiber is an inorganic fibrous material with carbon element mass more than 90%. And in the oxidation process, heat is transferred to the carbon fiber tows to enable the carbon fiber tows to undergo oxidation reaction, and circulating air is needed. The circulating air has the characteristics of high temperature which can reach 200-250 ℃, contains reaction byproducts, contains toxic and harmful substances such as hydrogen cyanide and the like, and can threaten the personal safety of on-duty staff if the circulating air leaks out of the oxidation furnace. In order to ensure the intrinsic safety of the oxidation process, the leakage of toxic and harmful circulating wind with higher temperature in the oxidation furnace is required to be prevented.

The air sealing device in the prior art generally adopts a nitrogen gas seal and comprises a nitrogen main pipeline, a gas transmission metal pipe, a gas transmission hose, a nitrogen bottle, a nitrogen flow monitoring device and a nitrogen pressure monitoring device. The gas transmission metal pipe transmits nitrogen from the main pipeline into the gas transmission hose, and flange tee joints are generally adopted between the metal pipes. The nitrogen flow monitoring device can monitor the real-time nitrogen flow in the gas transmission metal pipe. The gas transmission hose conveys nitrogen into the nitrogen cylinder, the nitrogen cylinder provides air pressure for the nitrogen, and the nitrogen cylinder is conveyed to the hearth inlet and outlet of the high-temperature furnace through the hose, so that the gas seal function is achieved. The nitrogen pressure monitoring device can monitor the real-time nitrogen pressure in the nitrogen cylinder. But the nitrogen gas airtight device has a complex structure and high production cost.

The present utility model has been made in view of this.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and aims to provide a carbonization line oxidation furnace system which solves the technical problems of higher temperature, more toxic and harmful circulating air leakage, more complex structure of an airtight device and higher production cost in an oxidation furnace in the prior art.

In order to solve the technical problems, the utility model adopts the basic conception of the technical scheme that: the carbonization line oxidation furnace system comprises an oxidation furnace, wherein an outlet and an inlet for tows to pass through are formed in the oxidation furnace, and the carbonization line oxidation furnace system further comprises an airtight air duct, an air inlet end and an air supply end, wherein the airtight air duct is communicated with the oxidation furnace and used for guiding out hot air in the oxidation furnace, and the air supply end is arranged at the outlet end and/or the inlet end of the oxidation furnace and used for supplying air into the oxidation furnace.

According to the utility model, the air supply end of the airtight air duct is arranged at the outlet end and/or the inlet end of the oxidation furnace, so that the air flowing through the airtight air duct forms high-pressure air flow, and the high-pressure air flow is conveyed back into the oxidation furnace through the air supply end, thereby avoiding leakage of the air flow with higher internal temperature, toxicity and harm to the outside of the oxidation furnace and preventing cold air outside the oxidation furnace from entering the furnace, ensuring more uniform internal temperature of the oxidation furnace, achieving the sealing effect and ensuring the intrinsic safety of production.

Further, the airtight air duct comprises an air supply pipe, an air supply opening communicated with the inside and the outside of the air supply pipe is formed in the side wall of the air supply pipe, the air supply opening is arranged towards the outlet end and/or the inlet end, and the air supply pipe forms the air supply end.

Further, a plurality of air supply outlets are formed in the side wall of the air supply pipe, and the air supply outlets are distributed at intervals along the axial direction of the air supply pipe.

Further, one end of the air supply pipe is communicated with the air inlet end of the airtight air duct, and the other end of the air supply pipe is closed.

Further, the area of the radial cross section of the air inlet end of the airtight air duct is larger than that of the radial cross section of the air supply pipe.

Further, the upper side and the lower side of the outlet end and/or the inlet end of the oxidation furnace are respectively provided with the blast pipes.

Further, the outlet end and/or the inlet end of the oxidation furnace are/is provided with a cross section, the blast pipe extends from one end of the cross section to the other end, and the blast pipe is perpendicular to the center vertical line of the cross section of the outlet end and/or the inlet end.

Further, the tow moves in a horizontal direction from an inlet end of the oxidation oven to an outlet end of the oxidation oven;

the included angle between the surface of the central axis of the air supply outlet on the air supply pipe at the inlet end of the oxidation furnace and the surface of the moving direction of the filament bundles is an acute angle.

Further, an included angle between a surface of the central axis of the air supply outlet on the air supply pipe at the outlet end of the oxidation furnace and a surface of the moving direction of the filament bundle is an obtuse angle.

Further, the carbonization line oxidation furnace system further comprises a fan arranged on the oxidation furnace, and an air outlet of the fan is communicated with an air inlet end of the airtight air duct and used for conveying hot air in the oxidation furnace to the air inlet end.

By adopting the technical scheme, compared with the prior art, the utility model has the following beneficial effects.

(1) According to the utility model, the air supply end of the airtight air duct is arranged at the outlet end and/or the inlet end of the oxidation furnace, so that the air flowing through the airtight air duct forms high-pressure air flow, and the high-pressure air flow is conveyed back into the oxidation furnace through the air supply end, thereby avoiding leakage of the air flow with higher internal temperature, toxicity and harm to the outside of the oxidation furnace and preventing cold air outside the oxidation furnace from entering the furnace, ensuring more uniform internal temperature of the oxidation furnace, achieving the sealing effect and ensuring the intrinsic safety of production.

(2) The carbonization line oxidation furnace system of the utility model ensures that high-temperature gas in the oxidation furnace flows through the airtight pipe and returns to the oxidation furnace, thereby avoiding the adverse effect that cold air enters the furnace to cause uneven temperature in the furnace and cause condensation of reaction byproducts into tar.

(3) The carbonization line oxidation furnace system has a simple structure, saves the occupied area of the oxidation furnace on a production line, and reduces the production cost of the oxidation furnace.

(4) The carbonization line oxidation furnace system does not need to heat the air flow in the oxidation furnace again, so that the internal structure is simplified, the cost is saved, and the resources are saved.

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

FIG. 1 is a block diagram of a carbonization line oxidizer system in accordance with the present utility model;

FIG. 2 is an enlarged view of the utility model shown in FIG. 1A;

FIG. 3 is a block diagram of an air supply duct in a carbonization line oxidizer system in accordance with the present utility model;

FIG. 4 is a diagram showing the positional relationship between the air supply pipe and the filament bundle at the inlet end of the oxidizing furnace in the carbonization line oxidizing furnace system according to the present utility model;

FIG. 5 is a diagram of the positional relationship between the air supply pipe and the filament bundle at the outlet end of the oxidation oven in the carbonization line oxidation oven system according to the present utility model;

FIG. 6 is a distribution diagram of the gas distribution system of the oxidizing furnace of the present utility model;

fig. 7 is a cross-sectional view of the dust collector of the present utility model.

In the figure: 1. an oxidation furnace; 11. a bottom; 12. an inlet end; 13. an outlet end; 14. a filament passage heating zone; 2. an airtight air duct; 21. an air inlet end; 22. an air supply end; 23. an air supply pipe; 231. an air supply port; 232. a conduction end; 233. a closed end; 24. a first extension; 25. a second extension; 3. a blower; 4. a circulating fan; 5. a tow; 10. a heat exchanger; 101. fresh air fan of heat exchanger; 102. a heat exchanger proportional valve; 30. an incinerator; 301. a combustion fan; 302. a fire detector; 303. waste discharge fans; 304. a dust remover; 3041. an outer pipe; 3042. an inner pipe; 3043. a dust removal fan; 3044. an air lock; 40. a cooling device; 401. fresh air blower; 402. and a proportional valve.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and the following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 7, a carbonization line oxidation oven system according to the present utility model is shown, in which the direction indicated by the arrow is the flow direction of the air flow.

The carbonization line oxidation furnace system comprises an oxidation furnace 1, wherein an inlet end 12 and an outlet end 13 for the tows 5 to pass through are formed in the oxidation furnace 1. The carbonization line oxidation furnace system is used for preventing the air flow with higher internal degree and toxicity and harm of the oxidation furnace 1 from leaking and preventing cold air outside the oxidation furnace 1 from entering the furnace, so that adverse phenomena of tar due to low-temperature condensation of reaction byproducts are avoided.

The carbonization line oxidation furnace system further comprises an airtight air duct 2, wherein the airtight air duct 2 is provided with an air inlet end 21 communicated with the oxidation furnace 1 and used for guiding out hot air in the oxidation furnace 1, and an air supply end 22 arranged at the outlet end 13 and/or the inlet end 12 of the oxidation furnace 1 and used for supplying air into the oxidation furnace 1.

According to the utility model, the air supply end 22 of the airtight air duct 2 is arranged at the outlet end 13 and/or the inlet end 12 of the oxidation furnace 1, so that the air flowing through the airtight air duct 2 forms high-pressure air flow, and is conveyed back to the inside of the oxidation furnace 1 through the air supply end 22, thereby avoiding leakage of the air flow with higher internal temperature, toxicity and harm to the outside of the oxidation furnace 1 and preventing cold air outside the oxidation furnace 1 from entering the furnace, ensuring more uniform internal temperature of the oxidation furnace 1, achieving the sealing effect and ensuring the intrinsic safety of production.

The airtight air duct 2 is arranged on the side wall of the oxidation furnace 1. In particular, the airtight duct 2 is provided on a side close to the outlet end 13 and/or the inlet end 12 of the oxidation oven 1.

As shown in fig. 2 to 3, the airtight duct 2 includes an air supply duct 23. An air supply opening 231 for communicating the inside and the outside of the air supply pipe 23 is formed in the side wall of the air supply pipe 23, and the air supply opening 231 is arranged towards the outlet end 13 and/or the inlet end 12. The air supply duct 23 forms the air supply end 22.

According to the utility model, the air supply opening 231 is formed in the side wall of the air supply pipe 23, so that air flow in the oxidation furnace 1 passes through the airtight air duct 2, the air supply pipe 23 and the air supply end 22 formed by the air supply opening 231 in the air supply pipe 23, the air flow is conveyed back into the oxidation furnace 1 through the air supply pipe 23, and the air flow forms high-pressure air flow through the air supply opening 231 and forms convection phenomenon with the air flow in the oxidation furnace 1, thereby preventing cold air outside the oxidation furnace 1 from entering the furnace and enabling the temperature in the oxidation furnace 1 to be more uniform; on the other hand, the method avoids the reaction byproducts from being condensed into tar at low temperature, ensures stable and continuous production and ensures the product quality.

In addition, the airtight duct 2 further includes a first extension 24 and a second extension 25.

The first extension portion 24 extends from the air inlet end 21 of the airtight duct 2 to the outside of the sidewall of the oxidation furnace 1.

The second extension portion 25 extends from an extension end of the first extension portion 24 toward the outlet end 13 or the inlet end 12 of the oxidation furnace 1.

Specifically, the area of the radial cross section of the second extension portion 25 is smaller than that of the radial cross section of the first extension portion 24, and by gradually reducing the volume of the air flow flowing through the airtight duct 2, the pressure of the air flow flowing through the airtight duct 2 is gradually increased, thereby enhancing the wind speed of the air flow and further increasing the sealing effect.

As shown in fig. 3, a plurality of air supply openings 231 are formed in the side wall of the air supply duct 23.

In one embodiment, the plurality of air supply openings 231 are arranged at intervals along the axial direction of the air supply duct 23.

According to the utility model, the air supply outlets 231 are arranged at intervals along the axial direction of the air supply pipe 23, so that the air pressure of the air flow flowing into the oxidation furnace 1 is further enhanced, the flowing-out directions of the air flows from the air supply outlets 231 of the air supply pipe 23 are the same, the air leakage of the air flow with higher internal temperature, toxicity and harm to the outside and the cold air outside of the oxidation furnace 1 into the oxidation furnace 1 are better prevented, the tightness of the oxidation furnace 1 is further increased, and the safety of the production environment is ensured.

Specifically, the plurality of air outlets 231 are uniformly and alternately arranged along the axial direction of the air supply duct 23.

One end of the air supply pipe 23 is conducted, and the other end of the air supply pipe 23 is closed.

In another embodiment, the air supply opening 231 extends from a certain position of a side wall of one end of the air supply duct 23 to the other end of the air supply duct 23.

Specifically, the air supply opening 231 is an opening penetrating through the side wall of the air supply pipe 23, and by increasing the air pressure of the air flowing through the air supply opening 231, the air flow forms an air flow layer inside the oxidation furnace 1, so as to prevent the air flow inside the oxidation furnace 1 from leaking and prevent the air flow outside the oxidation furnace 1 from entering the oxidation furnace 1.

In one embodiment, the air supply openings 231 are unevenly and intermittently arranged along the axial direction of the air supply duct 23.

Further, one end of the air supply pipe 23 is communicated with the air inlet end 21 of the airtight air duct 2, and the other end of the air supply pipe 23 is closed.

According to the utility model, one end of the air supply pipe 23 is communicated with the air inlet end 21 of the airtight air duct 2, and the other end of the air supply pipe 23 is closed, so that the air flow flowing through the air supply pipe 23 is accumulated in the air supply pipe 23, the air pressure of the air flow flowing out of the air supply opening 231 is increased, the air tightness of the oxidation furnace 1 is enhanced, and the requirements of stable production and intrinsic safety are ensured.

Specifically, the conducting end 232 of the air supply pipe 23 is communicated with the air inlet end 21 of the airtight air duct 2. The closed end 233 of the blast pipe 23 is connected to the bottom 11 of the oxidation oven 1.

Furthermore, the radial cross-sectional area of the air inlet end 21 of the air-tight duct 2 is larger than the radial cross-sectional area of the air-supplying duct 23.

The utility model further enhances the air pressure of the air flow flowing to the air supply pipe 23 and increases the reliability of the carbonization line oxidation furnace system by setting the area of the radial cross section of the air inlet end 21 of the airtight air duct 2 to be larger than the area of the radial cross section of the air supply pipe 23.

Specifically, the area of the radial cross section of the second extension portion 25 of the air inlet end 21 of the air-tight duct 2 is larger than the area of the radial cross section of the air-supplying duct 23.

The area of the radial cross section of the second extension portion 25 of the air inlet end 21 of the airtight duct 2 may be smaller than or equal to the area of the radial cross section of the air supply duct 23, so long as it is satisfied that the gas inside the oxidation oven 1 does not leak to the outside and the air outside the oxidation oven 1 does not flow into the inside.

It should be noted that, when the air flow enters the airtight duct 2 from the first extension portion 24 of the air inlet end 21 of the airtight duct 2 and then flows through the second extension portion 25, the volume is reduced for the first time, and the air pressure of the air flow is increased; and then enters the air supply pipe 23, at which time the volume is reduced for the second time, and the air pressure of the air flow is further increased. At this time, the air pressure of the air flow is much higher than the air pressure entering the air inlet end 21 of the airtight duct 2, and when the air flows into the oxidation furnace 1 from the air supply opening 231, the purging strength of the air flow inside the oxidation furnace 1 is enhanced.

As shown in fig. 4 to 5, the air supply pipes 23 are respectively provided at the upper and lower sides of the outlet end 13 and/or the inlet end 12 of the oxidation furnace 1.

According to the utility model, the air supply pipes 23 are respectively arranged at the upper side and the lower side of the outlet end 13 and/or the inlet end 12 of the oxidation furnace 1, so that the air flow with higher internal temperature and toxicity and harm in the oxidation furnace 1 is prevented from leaking to the outside, and meanwhile, the air with lower external temperature in the oxidation furnace 1 is prevented from entering the oxidation furnace 1, so that reaction byproducts are condensed into tar due to low temperature.

In addition, the air supply pipe 23 may be alternatively or in combination disposed at the outlet end 13, the inlet end 12, the upper end of the filament bundle 5 and the lower end of the filament bundle 5 of the oxidation furnace 1. The air supply pipes 23 may be respectively disposed at the outlet end 13, the inlet end 12, the upper end of the filament bundle 5, and the lower end of the filament bundle 5 of the oxidation furnace 1.

It should be noted that the air-tightness of the interior of the oxidation oven 1 is best when the air-supplying pipes 23 are respectively provided at the outlet end 13, the inlet end 12, the upper end of the filament bundle 5 and the lower end of the filament bundle 5 of the oxidation oven 1.

The utility model adopts that the air supply pipes 23 are respectively arranged at the outlet end 13, the inlet end 12, the upper end of the filament bundle 5 and the lower end of the filament bundle 5 of the oxidation furnace 1. By arranging the air supply pipes 23 on the outlet end 13, the inlet end 12, the upper end of the filament bundle 5 and the lower end of the filament bundle 5 of the oxidation furnace 1 respectively, the cold air outside the oxidation furnace 1 is prevented from entering the inside to cause negative effects on the oxidation reaction of the filament bundle 5, and meanwhile, the heating device arranged inside the oxidation furnace 1 for ensuring the uniformity of the temperature inside the oxidation furnace 1 is also reduced, so that the cost is saved.

Furthermore, the outlet end 13 and/or the inlet end 12 of the oxidation oven 1 has a cross section. The air supply pipe 23 extends from one end to the other end of the cross section, and the air supply pipe 23 is perpendicular to the center vertical line of the cross section of the outlet end 13 and/or the inlet end 12.

The air supply pipes 23 extend from one end to the other end of the cross section of the outlet end 13 and/or the inlet end 12 of the oxidation furnace 1, and the air supply pipes 23 are perpendicular to the central vertical line of the cross section of the outlet end 13 and/or the inlet end 12, so that the air supply openings 231 of the air supply pipes 23 are in a horizontal state, and the air supply pipes 23 on the outlet end 13, the inlet end 12, the upper end of the filament bundle 5 and the lower end of the filament bundle 5 of the oxidation furnace 1 are mutually parallel, so that the air flow flowing through the air supply openings 231 can prevent external air from entering the oxidation furnace 1 and the air flow with high temperature and toxicity and harm inside the oxidation furnace 1 from leaking to the outside.

Specifically, the air supply duct 23 is arranged in a horizontal state.

As shown in fig. 4, the filament bundle 5 moves in a horizontal direction from the inlet end 12 of the oxidation oven 1 to the outlet end 13 of the oxidation oven 1.

The included angle between the surface of the air pipe 23 of the inlet end 12 of the oxidation furnace 1, on which the central axis of the air inlet 231 is located, and the surface of the tow 5, on which the moving direction is located, is an acute angle.

According to the utility model, the included angle between the surface of the central axis of the air supply opening 231 on the air supply pipe 23 of the inlet end 12 of the oxidation furnace 1 and the surface of the moving direction of the filament bundles 5 is regulated, so that the flowing direction of the air flow flowing into the oxidation furnace 1 from the air supply opening 231 is changed, and the tightness of the oxidation furnace 1 is further increased.

Specifically, the tow 5 enters the interior of the oxidation oven 1 from the inlet end 12 of the oxidation oven 1. Oxidation, cyclization and trapezoid reactions are performed in the oxidation furnace 1.

The surface of the air pipe 23 of the inlet end 12 of the oxidation furnace 1 on which the central axis of the air supply port 231 is located can be understood as: under the action of high air pressure, the air is blown from the air supply opening 231 on the air supply pipe 23 to the surface where the flow direction of the air flow in the oxidation furnace 1 is located.

The angle between the surface of the air pipe 23 at the inlet end 12 of the oxidation oven 1, on which the central axis of the air outlet 231 is located, and the surface of the tow 5, on which the moving direction is located, can be understood as: the surface of the air supply pipe 23 where the central axes of the plurality of air supply openings 231 are located forms an included angle with the horizontal direction.

It should be noted that, when the air flow is blown from the respective air supply openings 231 of the air supply duct 23 of the inlet end 12 of the oxidation oven 1 toward the inside of the oxidation oven 1, the air flow flows from the axial direction of each air supply opening 231 toward the inside of the oxidation oven 1 in correspondence with each air supply opening 231. By adjusting the angle of the included angle, the flow direction of the air flow can be controlled. The sealing performance of the oxidation furnace 1 is ensured to be increased to the greatest extent.

Preferably, the included angle between the surface of the air supply pipe 23 at the inlet end 12 of the oxidation furnace 1, where the central axes of the plurality of air supply openings 231 are located, and the surface of the surface where the moving direction of the filament bundles 5 is located is 60 degrees. As shown in fig. 4, when the included angle between the air supply opening 231 of the air supply pipe 23 at the upper and lower ends of each filament bundle 5 and the surface of the filament bundle 5 in the moving direction is adjusted to be 60 degrees, the air flow of the air supply opening 231 is blown to the upper and lower ends of the filament bundle 5 at the same time, so that continuous heating of the filament bundle 5 is ensured, and the tightness of the oxidation furnace 1 is further increased.

Furthermore, the air flow of the air supply opening 231 is simultaneously blown to the upper end and the lower end of the filament bundle 5, so that the continuous heating of the air flow by the heating device is avoided, and the production cost is saved.

As shown in fig. 5, the angle between the surface of the air pipe 23 at the outlet end 13 of the oxidation furnace 1, on which the central axis of the air inlet 231 is located, and the surface of the tow 5, on which the moving direction is located, is an obtuse angle.

According to the utility model, by adjusting the included angle between the surface of the central axis of the air supply opening 231 on the air supply pipe 23 of the outlet end 13 of the oxidation furnace 1 and the surface of the moving direction of the filament bundles 5, the flowing direction of the air flow flowing into the oxidation furnace 1 from the air supply opening 231 is changed, so that the air flow with higher internal temperature, toxicity and harm in the oxidation furnace 1 is prevented from leaking to the outside, the cold air outside the oxidation furnace 1 is prevented from entering the furnace, and the tightness of the oxidation furnace 1 is further improved.

Specifically, the filament bundles 5 undergo oxidation, cyclization, and trapezoid reactions in the oxidation furnace 1, and then exit from the outlet end 13 of the oxidation furnace 1, and undergo the next processing step.

Similarly, the surface of the air pipe 23 at the outlet end 13 of the oxidation furnace 1, on which the central axis of the air supply opening 231 is located, can be understood as: under the action of high air pressure, the air is blown from the air supply opening 231 on the air supply pipe 23 to the surface where the flow direction of the air flow in the oxidation furnace 1 is located.

The angle between the surface of the air pipe 23 of the outlet end 13 of the oxidation furnace 1, where the central axis of the air supply opening 231 is located, and the surface of the moving direction of the filament bundle 5 can be understood as: the surface of the air supply pipe 23 where the central axes of the plurality of air supply openings 231 are located forms an included angle with the horizontal direction.

Preferably, the included angle between the surface of the air supply pipe 23 at the outlet end 13 of the oxidation furnace 1, where the central axes of the plurality of air supply openings 231 are located, and the surface of the surface where the moving direction of the filament bundles 5 is located is 120 degrees.

As shown in fig. 1, the carbonization line oxidation oven system further comprises a blower 3, and the blower 3 is arranged on the oxidation oven 1. An air outlet (not shown) of the fan 3 is communicated with an air inlet end 21 of the airtight air duct 2. The air outlet is used for sending hot air in the oxidation furnace 1 into the air inlet end 21 of the airtight air duct 2.

According to the utility model, the fan 3 is arranged at the air inlet end 21 of the airtight air duct 2, so that hot air in the oxidation furnace 1 is fed into the air inlet end 21 of the airtight air duct 2, the air pressure of air flow in the airtight air duct 2 is increased, and the tightness of the oxidation furnace 1 is further ensured.

Specifically, the air inlet (not shown) of the blower 3 faces the inside of the oxidation oven 1, and is disposed opposite to the air inlet end 21 of the airtight duct 2.

It should be noted that, by adjusting the rotation speed of the fan 3, the air pressure intensity of the air flow flowing out from the air supply opening 231 of the air supply duct 23 is further changed; for example, the air pressure of the air flow flowing out from the air supply opening 231 of the air supply pipe 23 can reach 500 Pa-750 Pa, so that the toxic and harmful air flow with higher temperature inside the oxidation furnace 1 is prevented from leaking to the outside, and meanwhile, the outside air is prevented from entering the oxidation furnace 1, the sealing effect is achieved, and the intrinsic safety of production is ensured.

In addition, the carbonization line oxidation furnace system further comprises a circulating fan 4. The circulating fan 4 is used for transferring heat inside the oxidation furnace 1 to various places inside the oxidation furnace 1.

Specifically, the circulating fan 4 is provided on the inner wall of the oxidation oven 1.

As shown in fig. 6, the carbon fiber oxidation furnace 1 system further includes an incinerator 30 and a heat exchanger 10, the incinerator 30 being in communication with the oxidation furnace 1 for incinerating exhaust gas discharged from the oxidation furnace 1,

the heat exchanger 10 is respectively communicated with the oxidation furnace 1 and the incinerator 30, and is used for exchanging heat between hot air and fresh air generated by the incinerator 30 and introducing the fresh air after heat exchange into the oxidation furnace 1,

the oxidation furnace 1 system further comprises a cooling device 40, wherein the cooling device 40 is arranged between the heat exchanger 10 and the oxidation furnace 1 and is used for cooling fresh air flowing from the heat exchanger 10 to the oxidation furnace 1.

In actual production, in the carbonization line oxidation process, external fresh air sequentially enters the oxidation furnace 1 from the heat exchanger 10 through the connecting pipeline, then the waste gas of the oxidation furnace 1 is discharged from the outlet end 13 into the combustion furnace 30 for combustion, the combustion-supporting fan 301 is started to inject a proper amount of natural gas into the combustion furnace 30, in the process, the flame arrester 302 detects the natural gas and air in the combustion furnace 30 in real time, the waste heat of the combustion waste gas of the combustion furnace 30 is utilized to heat the external air entering the oxidation furnace 1, but the waste gas is discharged into the air through the waste discharge fan 303 after being combusted in the combustion furnace 30, generally, the process temperature range of the combustion furnace 30 is generally 550-600 ℃, the temperature range in the oxidation furnace 1 is required to be kept between 200-250 ℃, at the moment, the probability of wire breakage and wire breakage of carbon fibers is the lowest, that is, namely, the temperature of the waste heat in the combustion furnace 30 after heating the fresh air pipeline passing through the heat exchanger 10 exceeds the process temperature of the oxidation furnace 1, in the utility model is provided with the cooling device 40 on the line of the combustion waste heat of the combustion furnace 30, in order to ensure that the temperature entering the oxidation furnace 1 is close to the oxidation furnace 1, and the temperature of the fresh air can be cooled by a user at the real time after the temperature sensor is arranged at the connection pipe of the oxidation furnace 1.

In detail, a plurality of oxidizing ovens 1 are generally provided in the oxidizing oven 1 system, and the plurality of oxidizing ovens 1 are arranged in parallel, for example, four oxidizing ovens 1 are arranged in parallel in this embodiment, four oxidizing ovens 1 are arranged in parallel at the outlet of the fresh air fan 401, and according to a large amount of experimental data, the average temperatures of the four oxidizing ovens 1 are sequentially set to 230 ℃, 240 ℃, 250 ℃, 260 ℃ and the exhaust gas discharge flows of the oxidizing ovens 1 are 1000m each ³ /h、1300m ³ /h、750m ³ /h、1400m ³ And/h, the heat in the exhaust gas discharged by the four oxidizing furnaces 1 every day is 30560MJ, which is equivalent to the heat generated by 860 standard cubic meters of natural gas combustion. In this way, the circulating operation between the incinerator 30 and the oxidizing furnace 1 system can be realized, the waste heat in the waste gas of the oxidizing furnace 1 is recycled to supply energy to the oxidizing furnace 1, the energy consumption and the production cost of the carbon fiber carbonization line are further reduced, and the user experience is better.

It is to be understood that the cooling device 40 may be a water cooling device, which is disposed on the outer peripheral wall of the connecting pipeline, or the cooling device 40 may also be a cooling device by introducing fresh air into the oxidation furnace 1, at this time, a temperature sensor may be disposed at an end of the oxidation furnace 1, or the like, and the specific structure of the cooling device 40 is not specifically limited as long as the process temperature in the oxidation furnace 1 can be reduced. In this way, the temperature of the fresh air entering the oxidation furnace 1 can be prevented from exceeding the process temperature, and the carbon fiber tows 5 are burnt out, so that the occurrence of broken filaments and broken filaments of the carbon fiber tows 5 is avoided or reduced, and the quality of carbon fiber products is improved.

It should be further noted that, the cooling device 40 may be opened for a prolonged period of time, or the cooling device may be cooled by increasing the rotation speed of the fresh air fan 401, and the cooling device mainly changes the rotation speed of the fresh air fan 401, so that the service life of the fresh air fan 401 is prolonged, and the maintenance cost is reduced.

Preferably, the heat exchanger 10 is communicated with the oxidation furnace 1 through a heat exchange pipeline, the cooling device 40 comprises a fresh air fan 401, and an air outlet end of the fresh air fan 401 is communicated with the heat exchange pipeline and is used for introducing fresh air into the heat exchange pipeline.

It should be noted that, the four oxidizing ovens 1 may be disposed in parallel at the outlet of the heat exchange pipeline, or an independent fresh air fan 401 may be disposed at a position corresponding to each oxidizing oven 1. Preferably, the four oxidation furnaces 1 are arranged at the outlet of the heat exchange pipeline in parallel, so that fresh air subjected to heat exchange is uniformly output into the four oxidation furnaces 1, the temperature requirement of each oxidation furnace 1 can be met, the processing cost is reduced, and the four oxidation furnaces 1 can be operated simultaneously to improve the processing efficiency.

In this embodiment, the inlet end of the heat exchange pipeline is connected to the outlet end of the heat exchanger 10, the outlet of the heat exchange pipeline is connected to the inlet end 12 of the oxidation furnace 1, at this time, the first air outlet end of the fresh air fan 401 is disposed at an arbitrary position of the heat exchange pipeline, specifically, a three-way valve may be disposed at the connection position of the first air outlet end and the heat exchange pipeline, at this time, an included angle may be formed between the transmission direction of the fresh air and the flow direction of the fresh air of the heat exchange pipeline, for example, the included angle may be set to any one of an acute angle, a right angle and an obtuse angle, so long as the fresh air can be introduced into the heat exchange pipeline, preferably, the included angle is a sharp included angle, air resistance formed between the fresh air and the air in the heat exchange pipeline may be avoided, so that the fresh air and the air in the heat exchange pipeline perform heat exchange sufficiently, thereby enabling the temperature of the air in the heat exchange pipeline to reach a set range, and ensuring normal operation of the oxidation furnace 1.

In addition, the rotation speed of the fresh air fan 401 can be adjusted according to the temperature in the oxidation furnace 1, for example, when the temperature is higher, the rotation speed of the fresh air fan 401 is increased, so that the fresh air quantity entering the oxidation furnace 1 can be increased, and more fresh air can be cooled; and when the temperature is lower, the rotating speed of the fresh air fan 401 is reduced, and the overlarge temperature reduction can be avoided, so that the temperature in the oxidation furnace 1 can be ensured to be rapidly reduced, the cooling time is saved, the temperature in the oxidation furnace 1 can be kept stable, and the quality of carbon fiber products is ensured.

Preferably, the cooling device 40 further includes a proportional valve 402, disposed between the air outlet end of the fresh air fan 401 and the air inlet end of the oxidation furnace 1, for controlling the fresh air volume introduced into the heat exchange pipeline.

It should be noted that, the proportional valve 402 is often set as an electromagnetic valve, the proportional valve 402 is electrically connected with a controller of the system, in addition, the proportional valve 402 is set at and in order to control the air volume of the fresh air fan 401 entering the air inlet end of the oxidation furnace 1, that is, the system can detect the opening of the electromagnetic valve in real time and feed back a signal to the controller, and then the controller controls the rotating speed of the fresh air fan 401 to further control the fresh air volume input to the oxidation furnace 1, so that the temperature of the oxidation furnace 1 can be controlled within a set range rapidly by controlling the fresh air volume, the accuracy of temperature control is improved, meanwhile, the control time is shortened, and the user is satisfied.

Preferably, the oxidizing furnace 1 system further comprises: the fresh air fan 101 of the heat exchanger is connected with the heat exchanger 10 at the air outlet end and is used for passing fresh air into the heat exchanger 10;

and the controller is connected with the heat exchanger fresh air fan 101 and the proportional valve 402 and is used for controlling the opening degree of the proportional valve 402 according to the air supply quantity of the heat exchanger fresh air fan 101.

It should be noted that, the second air outlet end of the heat exchanger fresh air fan 101 is provided with a heat exchanger proportional valve 102, that is, the heat exchanger proportional valve 102 is disposed between the air outlet end of the heat exchanger fresh air fan 101 and the heat exchanger 10, and the opening value of the heat exchanger proportional valve 102 controls the flow rate of the heat exchanger fresh air fan 101, so as to control the fresh air quantity flowing to the heat exchanger 10.

It should be further noted that, the heat exchanger fresh air fan 101 and the fresh air fan 401 are electrically connected with the controller, in addition, the heat exchanger fresh air fan 101 and the fresh air fan 401 can be controlled independently, or the heat exchanger fresh air fan 101 and the fresh air fan 401 can also be linked with each other through the controller, in general, the heat exchanger fresh air fan 101 and the fresh air fan 401 are linked with each other, after the cooling device 40 is started, starting commands are respectively sent to the heat exchanger fresh air fan 101 and the fresh air fan 401 according to the temperature controller, at this time, the opening degrees of the two different fresh air fan 401 proportional valves 402 are set to different opening degrees, and the proportional valves 402 of the fresh air fan 401 and the heat exchanger proportional valve 102 are adjustable, so that the temperature in the oxidation furnace 1 can be controlled accurately by controlling the ratio of the fresh air quantity at high temperature and the fresh air quantity at low temperature, the accuracy of temperature control is improved, the product quality is prevented from being lowered, and the intrinsic safety of production is realized.

Meanwhile, after the fresh air fan 401 operates, the combustion-supporting fan 301 of the incinerator 30 needs to be synchronously adjusted to ensure that the incinerator 30 can burn normally and ensure stable operation of the oxidation furnace system.

Preferably, as shown in fig. 1, further comprising: and the circulating fan 4 is arranged between the inlet end 12 and the outlet end 13 of the oxidation furnace 1, is connected with the controller and is used for controlling the rotating speed of the circulating fan 4 according to the air supply quantity of the fresh air fan 101 of the heat exchanger.

Generally, the inside of the oxidation furnace 1 can be formed into an open air area, a filter screen and a filament channel heating area 14 from top to bottom, after the circulating fan 4 is started, in a cycle period of the internal circulation of the oxidation furnace 1, the air flows through the open air area close to the outside of the furnace in the oxidation furnace 1, then flows into the filament channel heating area 14 through the filter screen, transfers heat to the carbon fiber tows 5 horizontally running in the filament channel heating area 14, and finally is discharged from the outlet end 13; in addition, the inlet end 12 and the outlet end 13 are arranged on the top wall of the oxidation furnace 1, and at this time, the inlet end 12 and the outlet end 13 are both arranged in an open wind area; in addition, the rotation speed of the circulation fan 4 is generally related to the temperature in the oxidation furnace 1, that is, when the temperature in the oxidation furnace 1 is high, the rotation speed of the circulation fan 4 is increased, whereas the rotation speed of the circulation fan 4 is decreased, and at the same time, the rotation speed of the circulation fan 4 may be set in positive relation to the air supply amount of the fresh air fan 401, for example, when the air supply amount of the fresh air fan 401 is large, the rotation speed of the circulation fan 4 is increased, and correspondingly, when the air supply amount of the fresh air fan 401 is small, the rotation speed of the circulation fan 4 is maintained or the rotation speed of the circulation fan 4 is decreased.

It will be appreciated that the exhaust pipeline is installed beside the circulating fan 4, and part of circulating air containing reaction byproducts of the oxidation process is discharged into the incinerator 30 as exhaust gas, so that the concentration of the reaction byproducts of the oxidation process in the incinerator is ensured to be at a lower level, and the normal operation of the oxidation furnace 1 is ensured. In this way, the real-time state of each technological parameter in the oxidation furnace 1 can be ensured to meet the technological requirements, the stable and continuous production of the oxidation technological process can be ensured, the processing rate is improved, the wire burning and wire breakage in the carbonization line technological process are avoided, the spinnability of the carbon fibers in the oxidation process is improved, and the quality of products is improved.

Preferably, as shown in fig. 6 to 7, the dust remover 304 is further included, and the dust remover 304 includes: an outer pipe 3041, the side wall of which is provided with an opening for communicating with the oxidation furnace 1; an inner pipe 3042 sleeved inside the outer pipe 3041, wherein the lower end of the inner pipe 3042 is communicated with the outer pipe 3041, and the upper end of the inner pipe 3042 is communicated with the incinerator 30; the dust removing fan 3043 is disposed in the incinerator 30, and the air suction inlet thereof is disposed toward the upper end opening of the inner pipe 3042.

It should be noted that, the dust collector 304 is provided as a cyclone separator, the cyclone separator is disposed to extend in the vertical direction, at this time, the side wall of the outer pipe 3041 of the cyclone separator is connected to the outlet end 13 of the oxidation furnace 1, and the upper and lower ends of the outer pipe 3041 may be both provided as an opening structure, the inner pipe 3042 is disposed in the outer pipe 3041 and is disposed concentrically with the outer pipe 3041, after the assembly is completed, the upper end of the inner pipe 3042 is disposed flush with the top of the outer pipe 3041 and is connected to the incinerator 30, the lower end of the inner pipe 3042 is located at the middle position of the outer pipe 3041, i.e., the lower end of the inner pipe 3042 is lower than the outlet position of the oxidation furnace 1, a dust removing fan 3043 is disposed at the upper end of the inner pipe 3042, the air inlet of the dust removing fan 3043 faces the opening at the top of the inner pipe 3042, and correspondingly, a gas lock 3044 is also disposed at the lower end of the outer pipe 3041, and the center line of the gas lock 3044 is disposed in a funnel shape, and the center line of the gas lock 3044 is disposed on the same line as the dust removing fan 3043, and is lower than the lower end of the inner pipe 3044.

It will be appreciated that when the cyclone separator is operated, the dust removal fan 3043 is turned on, and due to the action of the dust removal fan 3043, a negative pressure effect is formed in the inner pipe 3042, so that the exhaust gas moves towards the interior of the incinerator 30, and when the exhaust gas enters the outer pipe 3041 tangentially along the section of the pipe, due to the inertia generated by the particulate matters during the movement, the exhaust gas rotates around the exhaust gas pipe of the inner pipe 3042, which leads to the incinerator 30, during the movement of the outer pipe 3041, and the particulate matters contained in the exhaust gas are thrown out due to the centrifugal action and are deposited in the air lock 3044 at the lower part of the outer pipe 3041. At this time, the exhaust gas at the lower end of the inner pipe 3042 may be primarily separated, i.e., the particulate matters in the exhaust gas settle down into the gas lock 3044 due to gravity, and the gas in the exhaust gas enters the incinerator 30 to be incinerated through the dust removing fan 3043, so that the particulate matters in the exhaust gas and the gas are conveniently separated, and the particulate matters are prevented from entering the incinerator 30.

It should be noted that the type of waste gas generated by the oxidation furnace 1 is mainly organic waste gas, and its main components include HCN and CH ₄ 、NH ₃ 、CO、CO ₂ Equimolecular water vapor; and contains a small amount of aromatic hydrocarbon, and the aromatic hydrocarbon is compared with HCN, CH ₄ The organic substances with small molecules, such as large molecular weight and high ratio of carbon content and hydrogen content in the molecule, at this time, the large molecules such as aromatic hydrocarbon and the like are formed into particles to be mixed with the waste gas of the oxidation furnace 1, and when the particles are burnt with oxygen at high temperature in the incinerator 30, toxic and harmful black smoke is easily generated. Meanwhile, when the aromatic hydrocarbon macromolecular particles are burnt, more natural gas is required to be input into the incinerator 30 through the combustion-supporting fan 301, so that the combustion in the incinerator 30 is heated, and therefore, the utility model can prevent or reduce the macromolecular particles such as aromatic hydrocarbon from entering the incinerator 30, and further can prevent the incinerator 30 from exhausting toxic and harmful gases to the atmosphere; meanwhile, the consumption of natural gas can be reduced, the production cost is reduced, and the user experience is better.

The foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited to the above-mentioned embodiment, but is not limited to the above-mentioned embodiment, and any simple modification, equivalent change and modification made by the technical matter of the present utility model can be further combined or replaced by the equivalent embodiment without departing from the scope of the technical solution of the present utility model.

Claims (10)

1. The carbonization line oxidation furnace system comprises an oxidation furnace, wherein an outlet and an inlet for a filament bundle to pass through are formed in the oxidation furnace, and the carbonization line oxidation furnace system is characterized by further comprising an airtight air duct, an air inlet end and an air supply end, wherein the airtight air duct is communicated with the oxidation furnace and used for guiding out hot air in the oxidation furnace, and the air supply end is arranged at the outlet end and/or the inlet end of the oxidation furnace and used for supplying air into the oxidation furnace.

2. A carbonization line oxidation oven system according to claim 1, wherein the airtight air duct comprises an air supply duct, an air supply opening communicating the inside and the outside of the air supply duct is provided on a side wall of the air supply duct, the air supply opening is provided towards the outlet end and/or the inlet end, and the air supply duct forms the air supply end.

3. The carbonization line oxidation oven system according to claim 2, wherein a plurality of air supply openings are formed in a side wall of the air supply pipe, and the plurality of air supply openings are arranged at intervals along an axial direction of the air supply pipe.

4. A carbonization line oxidation oven system according to claim 2 or 3, wherein one end of said air supply pipe is connected to the air inlet end of the airtight duct, and the other end is provided in a closed manner.

5. A carbonization line oxidation oven system according to claim 4, wherein the radial cross-sectional area of the air inlet end of said air tight duct is larger than the radial cross-sectional area of said air supply duct.

6. A carbonization line oxidation oven system according to claim 2 or 3 or 5, wherein said air supply pipes are provided at the upper and lower sides of the outlet end and/or inlet end of said oxidation oven, respectively.

7. A carbonization line oxidation oven system according to claim 2 or 3 or 5, wherein the outlet and/or inlet end of the oxidation oven has a cross section, the blast pipe extends from one end of the cross section to the other end, and the blast pipe is perpendicular to the center vertical of the cross section of the outlet and/or inlet end.

8. A carbonization line oxidizer system according to claim 7, wherein the tow moves in a horizontal direction from the entrance end of the oxidizer to the exit end of the oxidizer;

the included angle between the surface of the central axis of the air supply outlet on the air supply pipe at the inlet end of the oxidation furnace and the surface of the moving direction of the filament bundles is an acute angle.

9. The carbonization line oxidation oven system according to claim 8, wherein an included angle between a surface of a central axis of an air supply opening on an air supply pipe at an outlet end of the oxidation oven and a surface of a moving direction of the filament bundle is an obtuse angle.

10. The carbonization line oxidation oven system according to claim 1, further comprising a fan disposed on the oxidation oven, wherein an air outlet of the fan is in communication with an air inlet end of the airtight duct for feeding hot air in the oxidation oven into the air inlet end.

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