CN114395825A - Pre-oxidation furnace suitable for multi-specification fibers and control method thereof - Google Patents
Pre-oxidation furnace suitable for multi-specification fibers and control method thereof Download PDFInfo
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- CN114395825A CN114395825A CN202210129057.6A CN202210129057A CN114395825A CN 114395825 A CN114395825 A CN 114395825A CN 202210129057 A CN202210129057 A CN 202210129057A CN 114395825 A CN114395825 A CN 114395825A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/32—Apparatus therefor
- D01F9/328—Apparatus therefor for manufacturing filaments from polyaddition, polycondensation, or polymerisation products
Abstract
The invention relates to the technical field of carbon fiber production, in particular to a preoxidation furnace suitable for multiple specifications of fibers and a control method thereof, wherein the preoxidation furnace comprises: a pre-oxidation filament-feeding chamber through which the filament bundle passes; the common channel is communicated with one end of the pre-oxidation wire feeding chamber, and a circulating fan and a central air door arranged between the circulating fan and the pre-oxidation wire feeding chamber are arranged in the common channel; the circulating air duct is communicated with the other end of the pre-oxidation filament feeding chamber, and the circulating air duct is communicated with the common channel at the circulating fan to form an end-to-end circulating loop; the upper inlet air door is arranged at the top of the shared channel; one end of the lower air return cavity is communicated with the bottom of the pre-oxidation wire feeding chamber, the other end of the lower air return cavity is communicated with the circulating air duct, and a lower air door is arranged in the lower air return cavity; wherein the end-to-end circulation mode is implemented when the center damper is open and the upper inlet damper and the lower damper are closed, and the up-to-down circulation mode is implemented when the center damper is closed and the upper inlet damper and the lower damper are open.
Description
Technical Field
The invention relates to the technical field of carbon fiber production, in particular to a preoxidation furnace suitable for multiple specifications of fibers and a control method thereof.
Background
Preoxidation is an important intermediate process for producing carbon fibers, the process is a bridge for converting precursor into carbon fibers, and in the conversion process, linear molecular chains of PAN precursor are converted into preoxidized fibers with a heat-resistant ladder structure; in a high-temperature carbonization environment under the protection of inert gas, the carbon fiber is not melted and combusted, maintains the fiber form and is further converted into the carbon fiber with a disordered-layer graphite structure. If the preoxidation is not carried out, the linear molecular chain of the protofilament is thermally decomposed at high temperature and is converted into resin carbon instead of fibrous carbon with certain strength, and the carbonization yield is extremely low.
In the related art, the pre-oxidation can be divided into end-to-end, middle-to-end and top-to-bottom structural forms according to the direction of circulating air, different structural forms are applicable to different tows, for example, the structure of the pre-oxidation furnace in the end-to-end and middle-to-end circulating form is generally applicable to large tow production, and the structure in the top-to-bottom circulating form is generally applicable to small tow production;
however, the pre-oxidation furnace mainly aims at industrial production, has a simple structure and stable operation, and is mainly of a single structure, each single structure can only be matched with carbon fiber production of a few specifications generally, and more carbon fiber production process parameters cannot be mastered.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a pre-oxidation furnace suitable for multi-specification fibers and a control method thereof, and realizes blowing in multiple circulating air modes.
In order to achieve the purpose, the invention adopts the technical scheme that:
in one aspect, the present invention provides a pre-oxidation oven adapted for multi-gauge fibers, comprising:
a pre-oxidation filament-feeding chamber through which the filament bundle passes;
the common channel is communicated with one end of the pre-oxidation wire feeding chamber, and a circulating fan and a central air door arranged between the circulating fan and the pre-oxidation wire feeding chamber are arranged in the common channel;
the circulating air duct is communicated with the other end of the pre-oxidation wire feeding chamber, and the circulating air duct is communicated with the common channel at the circulating fan to form an end-to-end circulating loop;
the upper inlet air door is arranged at the top of the common channel and used for controlling the communication and the closing of the common channel and the top of the pre-oxidation wire feeding chamber;
one end of the lower air return cavity is communicated with the bottom of the pre-oxidation wire feeding chamber, the other end of the lower air return cavity is communicated with the circulating air channel, a lower air door is arranged in the lower air return cavity, and the lower air door is used for controlling the communication and the closing between the lower air return cavity and the circulating air channel;
wherein an end-to-end circulation mode is achieved when the center damper is open and the upper and lower dampers are closed, and a top-to-bottom circulation mode is achieved when the center damper is closed and the upper and lower dampers are open.
Furthermore, a circulating air filter screen is arranged in the circulating air duct.
Furthermore, a circulating air heater is arranged in the circulating air duct.
Further, one end of the pre-oxidation wire-feeding chamber, which is connected with the common channel, is provided with an end distributor, and one end of the pre-oxidation wire-feeding chamber, which is connected with the circulating air duct, is provided with a first air return cavity.
Further, an end part air return cavity is connected to the outer side of the end part distributor;
the air return pipeline is communicated with the end part air return cavity at one end and the circulating air channel at the other end, and is used for pumping part of air distributed by the end distributor back into the circulating air channel to prevent the air from leaking;
wherein, manual valves are arranged at two ends of the return air pipeline.
Further, a second air return cavity communicated with the circulating air duct is further arranged outside the first air return cavity;
the wire chamber is characterized by further comprising a fresh air duct, wherein the fresh air duct is located outside the second return air chamber and communicated with the second return air chamber, and the fresh air duct is perpendicular to the length direction of the pre-oxidation wire chamber.
Furthermore, a fresh air filter screen and a fresh air preheater are arranged in the fresh air duct.
Furthermore, the outer sides of the end air return cavity and the second air return cavity are also provided with air suction covers.
Furthermore, the upper inlet air door is further connected with an upper curve distributor, the top of the pre-oxidation wire feeding chamber is further connected with an upper inclined distributor, and a plurality of upper distribution air doors used for adjusting the flow rate are further arranged between the upper inclined distributor and the upper curve distributor.
In a second aspect, the present invention also provides a control method for a multi-specification fiber pre-oxidation furnace according to the first aspect, comprising the steps of:
when end-to-end circulation is required, closing the upper inlet damper and the lower damper and starting the central damper;
starting a circulating fan to enable airflow to enter one end of the pre-oxidation wire feeding chamber after passing through a common channel, flow to the other end of the pre-oxidation wire feeding chamber, enter a circulating air channel, and finally be sucked by the circulating fan to finish end-to-end circulation;
when up-to-down circulation is required, closing the central damper and opening the upper inlet damper and the lower damper;
and starting the circulating fan to enable the airflow to flow into the top of the pre-oxidation wire feeding chamber through the top of the common channel, flow to the bottom of the pre-oxidation wire feeding chamber, flow into the circulating air duct through the lower air return cavity, and finally be sucked by the circulating fan to finish up-down circulation.
The invention has the beneficial effects that: according to the invention, through the arrangement of the shared channel and the circulating fan, an end-to-end airflow circulating loop in the pre-oxidation filament conveying chamber is realized when the central air door is opened, and an upper airflow circulating loop to a lower airflow circulating loop in the pre-oxidation filament conveying chamber is realized when the upper inlet air door and the lower air door are opened. In addition, the pre-oxidation furnace with the structure can realize two circulating air modes, compared with the prior art, the economic benefit is improved, the occupied area of equipment can be reduced, the production of fiber tows with various specifications is realized through one furnace type, and the applicability of the pre-oxidation furnace is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of an end-to-end circulation pattern of a multi-gauge fiber pre-oxidation oven adapted according to an embodiment of the present invention;
FIG. 2 is a side view of an embodiment of the present invention that accommodates an up-to-down circulation pattern of a multi-gauge fiber pre-oxidation oven;
FIG. 3 is a top view of an oven for accommodating multiple gauge fiber pre-oxidation in an embodiment of the present invention;
FIG. 4 is a side view of an oven for pre-oxidation of fibers to accommodate multiple gauges in accordance with an embodiment of the present invention;
FIG. 5 is a top view of an embodiment of the present invention that accommodates a top-to-bottom circulation mode of a multi-gauge fiber pre-oxidation oven;
FIG. 6 is a schematic view of the damper according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The multi-specification fiber pre-oxidation furnace as shown in fig. 1 and fig. 2 comprises a pre-oxidation filament-feeding chamber 10, a common channel 20, a circulating air duct 30, an upper inlet damper 23 and a lower air return chamber 40, wherein:
the pre-oxidation filament-removing chamber 10 is used for the filament bundle to pass through, as shown in fig. 1 and fig. 2, the filament bundle completes chemical reactions such as oxidation, cyclization and dehydrogenation in the pre-oxidation filament-removing chamber 10, and the oxidation process can be promoted and the heat generated by the reaction can be taken away by blowing of the air flow;
the common channel 20 is communicated with one end of the pre-oxidation wire feeding chamber 10, and a circulating fan 21 and a central air door 22 arranged between the circulating fan 21 and the pre-oxidation wire feeding chamber 10 are arranged in the common channel 20; referring to fig. 1, when the circulation fan 21 and the central damper 22 are opened, the air flow will pass through one end of the pre-oxidation filament-removing chamber 10 and then flow toward the other end of the pre-oxidation filament-removing chamber 10;
the circulating air duct 30 is communicated with the other end of the pre-oxidation filament feeding chamber 10, and the circulating air duct 30 is communicated with the common channel 20 at the circulating fan 21 to form an end-to-end circulating loop; with reference to fig. 1, after flowing through the circulating air duct 30, the air flow flowing to the other end of the pre-oxidation filament-feeding chamber 10 is finally absorbed by the negative pressure at the circulating fan 21, so that an air circulation flow of the circulating fan 21-the common channel 20-the pre-oxidation filament-feeding chamber 10-the circulating air duct 30-the circulating fan 21 is formed, and an end-to-end air flow in the pre-oxidation filament-feeding chamber 10 is realized in the process;
an upper inlet damper 23 is provided at the top of the common passage 20, as shown in fig. 2, for controlling the communication and closing of the common passage 20 with the top of the pre-oxidation filament-feeding chamber 10; it is to be noted here that the communication and blocking of the common passage 20 with the top of the pre-oxidation chamber 10 is achieved by the opening and closing of the upper inlet damper 23;
one end of the lower air return cavity 40 is communicated with the bottom of the pre-oxidation filament removing chamber 10, the other end of the lower air return cavity is communicated with the circulating air duct 30, a lower air door 41 is arranged in the lower air return cavity 40, and the lower air door 41 is used for controlling the communication and the closing between the lower air return cavity 40 and the circulating air duct 30; thus, when the lower air door 41 is opened, the airflow flowing out from the bottom of the pre-oxidation filament removing chamber 10 flows into the circulating air duct 30 through the lower air return cavity 40, and is finally absorbed by the circulating fan 21, so that continuous airflow circulation from top to bottom in the pre-oxidation filament removing chamber 10 is realized;
in specific implementation, as shown in fig. 6, the structure of the damper is similar to that of a valve, and the opening and closing of the door body are realized through the rotation of the damper; when end-to-end circulation is required, the upper inlet damper 23 and the lower damper 41 are closed and the central damper 22 is actuated;
starting a circulating fan 21 to enable airflow to enter one end of the pre-oxidation wire feeding chamber 10 after passing through the common channel 20, flow to the other end of the pre-oxidation wire feeding chamber 10, enter a circulating air duct 30, and finally be sucked by the circulating fan 21 to finish end-to-end circulation;
when up-to-down circulation is required, the center damper 22 is closed and the upper inlet damper 23 and lower damper 41 are opened;
and starting the circulating fan 21, so that the airflow flows into the top of the pre-oxidation wire-removing chamber 10 through the top of the common channel 20, flows to the bottom of the pre-oxidation wire-removing chamber 10, flows into the circulating air duct 30 through the lower air return cavity 40, and is finally sucked by the circulating fan 21 to complete the up-down circulation.
In the above embodiment, by the arrangement of the common passage 20 and the circulating fan 21, an end-to-end airflow circulation loop in the pre-oxidation filament feeding chamber 10 is realized when the central damper 22 is opened, and an up-to-down airflow circulation loop in the pre-oxidation filament feeding chamber 10 is realized when the upper inlet damper 23 and the lower damper 41 are opened, so that the fiber pre-oxidation process with more specifications can be adapted compared with a single structure in the prior art. The pre-oxidation furnace with the structure can realize two circulating air modes, and compared with the prior art, the pre-oxidation furnace not only improves the economic benefit, but also can reduce the occupied area of equipment, realizes the production of fiber tows with various specifications through one furnace type, and further improves the applicability of the pre-oxidation furnace.
In the pre-oxidation process of the carbon fiber, more broken filaments are generated due to raw materials and process reasons, the broken filaments are inflammable, in order to prevent the broken filaments from entering the common channel 20, the circulating air duct 30 is internally provided with the circulating air filter screen 31 in the embodiment of the invention, and the arrangement of the circulating air filter screen 31 can reduce the burning of the broken filaments entering the heater, improve the stability of the pre-oxidation furnace and reduce the occurrence of safety accidents;
in the embodiment of the present invention, with continued reference to fig. 1, the circulating air duct 30 further includes a circulating air heater 32 therein. The circulating air heater 32 can preheat the passing circulating air to reach the temperature of the starting end of the pre-oxidation filament feeding chamber 10, so that the oxidation reaction in the pre-oxidation filament feeding chamber 10 can be reliably carried out;
in order to further improve the airflow utilization rate of the circulating air, in the embodiment of the invention, as shown in fig. 3, the end of the pre-oxidation filament-removing chamber 10 connected with the common channel 20 is provided with an end distributor 24, and the end of the pre-oxidation filament-removing chamber 10 connected with the circulating air duct 30 is provided with a first air return cavity 25. In the embodiment of the present invention, the end distributor 24 functions to change the direction of the wind, change the direction of the airflow blown into the pre-oxidation filament-running chamber 10 vertically by 90 degrees, so that the wind direction is parallel to the length direction of the pre-oxidation filament-running chamber 10, thereby facilitating the smooth airflow, while the first air-returning chamber 25 functions to guide the airflow so that the airflow flowing through the end of the pre-oxidation filament-running chamber 10 enters the circulating air duct 30, and reduces the outflow of the exhaust gas; in addition, with continued reference to fig. 3, in the embodiment of the present invention, the exhaust gas outlet 29 is further provided on the common channel 20, and it should be noted that by the arrangement of the exhaust gas outlet 29, dynamic balance between fresh air entering and exhaust gas discharging can be achieved, that is, a part of fresh air enters the common channel 20 from the outside, and a part of gas entering the common channel 20 is discharged from the exhaust gas outlet 29, so that a dynamic balance is formed, by the above arrangement, the concentration of harmful gas in the common channel 20 can be reduced, and by the later uniform treatment of the exhaust gas, safety accidents caused by the overflow of the harmful gas in the exhaust gas can be reduced.
On the basis of the above embodiment, the end distributor 24 in the embodiment of the present invention guides most of the gas flow to the layers of the end distributor 24 in addition to the pre-oxidation filament-feeding chamber 10, and the purpose of guiding is to ensure that the filaments passing between the end distributors 24 just before entering the pre-oxidation filament-feeding chamber 10 can be purged by the circulating air, and at this time, in order to further reduce the leakage of the gas, in the embodiment of the present invention, as shown in fig. 3, the outer side of the end distributor 24 is connected with an end air-returning cavity 26; the end return plenum 26 is disposed adjacent the end distributor 24 such that gas escaping from the end distributor 24 flows into the end return plenum 26; through the arrangement, the fiber which just enters the pre-oxidation filament-removing chamber 10 can be swept, and the overflow of waste gas can be reduced;
in order to further reduce the overflow of the exhaust gas, in the embodiment of the present invention, as shown in fig. 3, a return air duct 50 is further included, one end of the return air duct 50 is communicated with the end return air chamber 26, and the other end is communicated with the circulating air duct 30, for drawing part of the air distributed by the end distributor 24 back into the circulating air duct 30, so as to prevent the air from leaking; it should be noted that, in the embodiment of the present invention, since the pressure in the end portion air return chamber 26 is positive and the pressure in the circulating air duct 30 is negative, the air pumped out from the end portion air return chamber 26 can flow into the circulating air duct 30; of course, in order to improve the suction effect, a fan may be added in the return duct 50; in addition, it should be noted that in the embodiment of the present invention, the return air duct 50 operates in the end-to-end airflow cycle of the pre-oxidation shredding chamber 10, and the return air duct 50 has manual valves 51 at both ends, so that the return air duct 50 can be manually closed when switching to the upper-to-lower cycle operation mode.
In the embodiment of the present invention, an air sealing system is further provided, and with continued reference to fig. 3, a second air return cavity 27 communicated with the circulating air duct 30 is further provided outside the first air return cavity 25;
the wire pre-oxidation wire feeding chamber 10 is characterized by further comprising a fresh air duct 60, wherein the fresh air duct 60 is located on the outer side of the second air return cavity 27 and is communicated with the second air return cavity 27, and the fresh air duct is perpendicular to the length direction of the pre-oxidation wire feeding chamber 10. When end-to-end circulation is carried out, the gas in the fresh air duct 60 is blown into the circulating air duct 30 through the second air return cavity 27, and the gas in the fresh air duct is blown vertically to form a seal for the outlet end in the pre-oxidation wire feeding chamber 10 and prevent the waste gas in the pre-oxidation wire feeding chamber 10 from overflowing from the port;
of course, it should be noted that in the embodiment of the present invention, the fresh air duct 60 further includes a fresh air filter 61 and a fresh air preheater 62. The filter screen can reduce impurities in fresh air entering from the outside, and the gas entering the pre-oxidation filament-removing chamber 10 can be preheated by using the preheater, so that the influence on the oxidation process is reduced;
in addition, in order to further reduce the overflow of the exhaust gas in the pre-oxidation filament-removing chamber 10, in the embodiment of the present invention, with continuing reference to fig. 3, the end air-returning chamber 26 and the second air-returning chamber 27 are further provided with an air-sucking hood 28 outside. The air suction covers 28 are arranged at two ends of the pre-oxidation filament feeding chamber 10, and the air suction covers 28 form a second air curtain air seal in an active air suction mode, so that the overflow of waste gas in the pre-oxidation filament feeding chamber 10 is further reduced;
as shown in fig. 4, an upper curve distributor 11 is further connected to the upper inlet damper 23, an upper inclined distributor 12 is further connected to the top of the pre-oxidation filament-feeding chamber 10, and a plurality of upper distribution dampers 13 for regulating the flow rate are further provided between the upper inclined distributor 12 and the upper curve distributor 11. As shown in fig. 5, a plurality of upper distribution dampers 13 are provided in the upper curve distributor 11, each of which corresponds to a part of the zone, and by the arrangement of the upper distribution dampers 13, the balance of the wind flow in the whole zone can be achieved; the 180-degree turning of the airflow is realized through the arrangement of the bent distributor and the inclined distributor, so that the gas circulation can be more uniformly carried out from top to bottom, and the pre-oxidation effect is improved;
the following describes in detail the control method of the present invention according to the above embodiment of the present invention, which is adapted to two circulation modes of the multi-standard fiber pre-oxidation furnace:
when the end-to-end circulation mode is employed, it is necessary to close the upper inlet damper 23 and the lower damper 41 and open the manual valve 51 of the return duct 50 and the center damper 22. The high-speed airflow from the circulating fan 21 flows out from the central air door 22 through the common air duct, then enters the pre-oxidation filament-removing chamber 10 through the end distributor 24, enters the circulating air duct 30 through the first air return cavity 25 and the fresh air coming in from the fresh air duct 60, and is sucked by the circulating fan 21 again through the circulating air filter and the circulating air heater 32 to complete a cycle. Wherein the air suction hood 28 and the first air return cavity 25 form an inlet end air seal system to jointly seal the inlet end of the pre-oxidation wire feeding chamber 10, the end part of the air suction hood 28 and the equal strength air seal system form an outlet end air seal system to jointly seal the outlet end of the pre-oxidation wire feeding chamber 10, and waste gas produced by the pre-oxidation wire feeding chamber 10 is placed to overflow from the port; the gas in the end part air return cavity 26 flows back to the circulating air duct 30 through the air return pipeline 50, and the waste gas in the pre-oxidation wire removing chamber 10 is discharged through the waste gas outlet 29;
in the top-to-bottom circulation air mode, as shown in fig. 4 and 5, the central damper 22 and the manual valve 51 are closed, the upper inlet damper 23 and the lower damper 41 are opened, the high-speed air flow from the circulation fan 21 flows out from the upper inlet damper 23 through the common channel 20, then enters the pre-oxidation filament-removing chamber 10 through the upper bend distributor 11 and the upper inclined distributor 12, finally enters the circulation air duct 30 from the lower return air chamber 40 through the lower damper 41, and is sucked by the circulation fan 21 again through the circulation air filter and the circulation air heater 32 to complete a cycle.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An oven adapted for multiple gauge fiber pre-oxidation, comprising:
a pre-oxidation filament-feeding chamber through which the filament bundle passes;
the common channel is communicated with one end of the pre-oxidation wire feeding chamber, and a circulating fan and a central air door arranged between the circulating fan and the pre-oxidation wire feeding chamber are arranged in the common channel;
the circulating air duct is communicated with the other end of the pre-oxidation wire feeding chamber, and the circulating air duct is communicated with the common channel at the circulating fan to form an end-to-end circulating loop;
the upper inlet air door is arranged at the top of the common channel and used for controlling the communication and the closing of the common channel and the top of the pre-oxidation wire feeding chamber;
one end of the lower air return cavity is communicated with the bottom of the pre-oxidation wire feeding chamber, the other end of the lower air return cavity is communicated with the circulating air channel, a lower air door is arranged in the lower air return cavity, and the lower air door is used for controlling the communication and the closing between the lower air return cavity and the circulating air channel;
wherein an end-to-end circulation mode is achieved when the center damper is open and the upper and lower dampers are closed, and a top-to-bottom circulation mode is achieved when the center damper is closed and the upper and lower dampers are open.
2. The oven according to claim 1, wherein the circulating air duct has a circulating air filter screen therein.
3. The oven according to claim 2, wherein a circulating air heater is further provided in the circulating air duct.
4. The oven according to claim 1, wherein the pre-oxidation filamentation chamber has an end distributor at an end connected to the common channel, and the pre-oxidation filamentation chamber has a first return air chamber at an end connected to the circulating air duct.
5. The oven according to claim 4, wherein an end air return chamber is connected to the outside of the end distributor;
the air return pipeline is communicated with the end part air return cavity at one end and the circulating air channel at the other end, and is used for pumping part of air distributed by the end distributor back into the circulating air channel to prevent the air from leaking;
wherein, manual valves are arranged at two ends of the return air pipeline.
6. The oven according to claim 5, wherein a second air return chamber is provided outside the first air return chamber and is communicated with the circulating air duct;
the wire chamber is characterized by further comprising a fresh air duct, wherein the fresh air duct is located outside the second return air chamber and communicated with the second return air chamber, and the fresh air duct is perpendicular to the length direction of the pre-oxidation wire chamber.
7. The multi-specification fiber pre-oxidation furnace according to claim 6, wherein a fresh air filter screen and a fresh air preheater are further arranged in the fresh air duct.
8. The oven according to claim 7, wherein the end return air chamber and the second return air chamber are further provided with an air draft hood outside.
9. The oven according to claim 1, wherein an upper bend distributor is further connected to the upper inlet damper, an upper inclined distributor is further connected to the top of the pre-oxidation filamentation chamber, and a plurality of upper distribution dampers are further provided between the upper inclined distributor and the upper bend distributor for flow rate adjustment.
10. A control method of a multi-specification fiber pre-oxidation oven according to any one of claims 1 to 9, comprising the steps of:
when end-to-end circulation is required, closing the upper inlet damper and the lower damper and starting the central damper;
starting a circulating fan to enable airflow to enter one end of the pre-oxidation wire feeding chamber after passing through a common channel, flow to the other end of the pre-oxidation wire feeding chamber, enter a circulating air channel, and finally be sucked by the circulating fan to finish end-to-end circulation;
when up-to-down circulation is required, closing the central damper and opening the upper inlet damper and the lower damper;
and starting the circulating fan to enable the airflow to flow into the top of the pre-oxidation wire feeding chamber through the top of the common channel, flow to the bottom of the pre-oxidation wire feeding chamber, flow into the circulating air duct through the lower air return cavity, and finally be sucked by the circulating fan to finish up-down circulation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116949606A (en) * | 2023-06-21 | 2023-10-27 | 新创碳谷集团有限公司 | Main air flow return air cavity structure at end part of preoxidation furnace and hole site arrangement method |
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| CN116949606A (en) * | 2023-06-21 | 2023-10-27 | 新创碳谷集团有限公司 | Main air flow return air cavity structure at end part of preoxidation furnace and hole site arrangement method |
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