CN110578189A - Air return box for pre-oxidation furnace and pre-oxidation furnace - Google Patents
Air return box for pre-oxidation furnace and pre-oxidation furnace Download PDFInfo
- Publication number
- CN110578189A CN110578189A CN201910880394.7A CN201910880394A CN110578189A CN 110578189 A CN110578189 A CN 110578189A CN 201910880394 A CN201910880394 A CN 201910880394A CN 110578189 A CN110578189 A CN 110578189A
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- return
- oxidation furnace
- box
- oxidation
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- 230000003647 oxidation Effects 0.000 title claims abstract description 82
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 82
- 238000007789 sealing Methods 0.000 claims description 34
- 238000000605 extraction Methods 0.000 claims description 11
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 description 13
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- 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 belongs to the technical field of oxidation furnaces, and particularly relates to a return air box for a pre-oxidation furnace and the pre-oxidation furnace; the air return box for the pre-oxidation furnace comprises a first box body and a second box body which are sequentially arranged along the air return direction of the pre-oxidation furnace, wherein the first box body and the second box body are distributed at a preset interval; one side of the first box body facing the air return direction is provided with a first air return opening; the second box body comprises a return air cavity and a fresh air cavity which are sequentially distributed along the return air direction of the pre-oxidation furnace, one side of the return air cavity facing the return air direction is provided with a second return air inlet, and the fresh air cavity is provided with a fresh air inlet for introducing fresh air. The air return box for the pre-oxidation furnace has two stages of return air along the return air direction, the return air is sufficient, and the hot air flow in the pre-oxidation furnace cannot be influenced.
Description
Technical Field
the invention belongs to the technical field of oxidation furnaces, and particularly relates to a return air box for a pre-oxidation furnace and the pre-oxidation furnace.
background
In the production process of the carbon fiber, the preoxidation of the precursor plays a role in starting and stopping, and the preoxidation process of the precursor directly influences the yield and the performance of the carbon fiber. The purpose of the pre-oxidation process is to convert thermoplastic PAN linear macromolecular chains into non-plastic heat-resistant trapezoidal structures, so that the thermoplastic PAN linear macromolecular chains are not melted and non-combustible at high carbonization temperature, maintain the fiber shape, and the thermodynamics is in a stable state, and finally are converted into carbon fibers with disordered-layer graphite structures. The pre-oxidation furnace is produced according to the requirements of the pre-oxidation process.
Existing pre-oxidation ovens generally comprise:
The end walls at two ends of the furnace body are provided with a plurality of groups of through holes which are distributed along the height direction and are oppositely arranged, and the through holes are used for penetrating through fibers; wherein, the furnace body is sealed with gas except the through hole;
The furnace body is internally provided with wire moving channels which are distributed along the length direction of the furnace body and used as a space for fiber pre-oxidation treatment;
An air duct is arranged in the furnace body, a heater and a fan are arranged in the air duct, the heater is positioned at the upstream of the fan, and the fan blows hot air heated by the heater in the air duct into the wire moving channel;
The air return device is arranged at the end part of the wire moving channel and comprises a plurality of air return boxes which are arranged at a vertical distance; an air inlet and an air outlet of the air return box are respectively communicated with the wire feeding channel and the upstream end of the air channel;
the air outlet device is arranged in the wire moving channel and comprises a plurality of distributors arranged at vertical intervals so as to ensure that hot air is uniformly blown into the wire moving channel; the spacing spaces between adjacent distributors form a tow channel;
The fan enables hot air to circulate through the air outlet device, the wire feeding channel and the air return device;
And the guide rollers are used for guiding the fibers to pass through the through holes, the vertical space between the adjacent air return boxes and the tow channel between the adjacent distributors in a snake-shaped distribution manner.
Although the existing air return boxes have high air return efficiency, the gaps between the adjacent air return boxes easily cause that a small part of hot air is not sucked by the air return opening of the air return boxes, thereby influencing the preoxidation treatment of fibers.
Disclosure of Invention
Based on the defects in the prior art, the invention provides an air return box for a pre-oxidation furnace and the pre-oxidation furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
A return air box for a pre-oxidation furnace comprises a first box body and a second box body which are sequentially arranged along the return air direction of the pre-oxidation furnace, wherein the first box body and the second box body are distributed at a preset interval;
One side of the first box body facing the air return direction is provided with a first air return opening;
the second box body comprises a return air cavity and a fresh air cavity which are sequentially distributed along the return air direction of the pre-oxidation furnace, one side of the return air cavity facing the return air direction is provided with a second return air inlet, and the fresh air cavity is provided with a fresh air inlet for introducing fresh air.
as a preferred scheme, the fresh air cavity is provided with a fresh air inlet communicated with the outside.
As a preferred scheme, the air outlet direction of the fresh air inlet of the fresh air cavity is perpendicular to the air return direction of the pre-oxidation furnace.
As the preferred scheme, the fresh air inlet of the fresh air cavity is circumferentially distributed along the direction vertical to the return air of the pre-oxidation furnace.
preferably, the preset distance between the first box body and the second box body is larger than 60 mm.
Preferably, a first mesh plate is arranged at the first air return opening of the first box body, and a second mesh plate is arranged at the second air return opening of the second box body.
The invention also provides a pre-oxidation furnace, wherein a plurality of air return boxes which are arranged in the pre-oxidation furnace at intervals vertical to the air return direction are arranged in the pre-oxidation furnace.
preferably, the pre-oxidation furnace is provided with drawing and inserting ports which respectively correspond to the first mesh plate and the second mesh plate one by one, and the drawing and inserting ports are provided with heat-preservation sealing plugs.
as a preferred scheme, an air suction channel is arranged corresponding to the drawing and inserting port; when the heat-insulating sealing plug is separated from the extraction opening, the air suction channel recovers the air flow overflowing from the extraction opening.
preferably, the pre-oxidation oven is used for manufacturing carbon fibers.
Compared with the prior art, the invention has the beneficial effects that:
the air return box for the pre-oxidation furnace has two stages of return air along the return air direction, the return air is sufficient, and the hot air flow in the pre-oxidation furnace cannot be influenced.
The pre-oxidation furnace has good pre-oxidation treatment effect on fibers.
Drawings
FIG. 1 is a schematic structural view of a return air box for a pre-oxidation furnace according to a first embodiment of the present invention;
FIG. 2 is a schematic vertical sectional view of a pre-oxidation furnace according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a horizontal sectional structure of a pre-oxidation furnace according to a first embodiment of the present invention;
FIG. 4 is an enlarged view of section I of FIG. 2;
FIG. 5 is a schematic view showing the structure of a distributor of a pre-oxidation furnace according to a first embodiment of the present invention;
FIG. 6 is a schematic view showing the construction of a first casing of a distributor of a pre-oxidation oven according to a first embodiment of the present invention;
FIG. 7 is a schematic structural view of a second casing of a distributor of the pre-oxidation oven according to the first embodiment of the present invention;
FIG. 8 is an enlarged view of section II of FIG. 2;
FIG. 9 is a schematic structural view of a return box for a pre-oxidation furnace according to a second embodiment of the present invention;
FIG. 10 is a schematic view of a horizontal cross-sectional structure of a pre-oxidation furnace in an on-line cleaning process according to a second embodiment of the present invention;
FIG. 11 is an enlarged view of a portion of a drawer of a pre-oxidation oven according to a second embodiment of the present invention;
FIG. 12 is an enlarged view of a portion of the extraction opening of the pre-oxidation oven according to the second embodiment of the present invention (the heat-retaining sealing plug is not shown);
fig. 13 is a schematic side view of a pre-oxidation furnace according to a second embodiment of the present invention.
Detailed Description
in order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
The first embodiment is as follows:
As shown in fig. 1, the air return box for the pre-oxidation furnace of the present embodiment is a split type design, and includes a first box 1 and a second box 2 sequentially arranged along the air return direction of the pre-oxidation furnace, the first box 1 and the second box 2 are distributed at a preset distance, and the preset distance between the first box 1 and the second box 2 is greater than 60 mm.
Wherein, the first box 1 has the first return air inlet 10 towards one side of the return air direction for absorbing most of the wind blowing to the stove end in the stove, in order to return air to the return air wind channel through the first box 1.
The second box 2 comprises a return air cavity 21 and a fresh air cavity 22 which are sequentially distributed along the return air direction of the pre-oxidation furnace, one side of the return air cavity 21 facing the return air direction is provided with a second return air inlet 210, the fresh air cavity 22 is provided with a fresh air inlet 220 used for introducing fresh air, and the fresh air cavity 22 is also provided with a fresh air inlet communicated with the outside so as to introduce the fresh air into the pre-oxidation furnace. Wherein, the air-out direction of the fresh air inlet 220 of the fresh air cavity is perpendicular to the return air direction of the pre-oxidation furnace, specifically, the fresh air inlet 220 of the fresh air cavity is circumferentially distributed along the return air direction of the pre-oxidation furnace, so that the fresh air supply efficiency is improved, and the influence on the hot air distribution in the furnace body is reduced. The second air return opening 210 is used for absorbing fresh air ejected from the fresh air cavity and entering the furnace body and a small part of hot air from the middle part of the furnace body so as to enter the return air cavity and return air to the return air channel of the furnace body for circulation.
In addition, the embodiment also provides a pre-oxidation furnace, wherein a plurality of air return boxes of the embodiment are arranged in the pre-oxidation furnace at intervals perpendicular to the air return direction.
Specifically, as shown in fig. 2 to 8, the pre-oxidation furnace of the present embodiment includes a furnace body 1 ', an air outlet device 2 ' and an air return device 3 ' installed in the furnace body, and further includes guide rollers 4 ' installed corresponding to the left and right ends of the furnace body 1 '.
Specifically, the furnace body 1' is a hollow cuboid structure which is surrounded by two vertical side walls 1a which are oppositely arranged along the length direction, two vertical end walls which are oppositely arranged along the width direction, a top wall 1b and a bottom wall 1 c; the end walls at the left end and the right end of the furnace body are provided with seven groups of through holes which are distributed at vertical intervals and are oppositely arranged; the furnace body 1 'is provided with wire-moving channels 10' distributed along the length direction, namely a hollow structure space in the furnace body, which is used as a wire-moving space for fiber pre-oxidation treatment.
In addition, as shown in fig. 3, the furnace body 1 'is further provided with two independent air return ducts 11', which are respectively located at the left side and the right side of the vertical central axis plane in the length direction of the furnace body and are not communicated with each other, with the vertical central axis plane in the length direction of the furnace body as a symmetry plane, and are respectively a left air return duct and a right air return duct; each return air duct is internally provided with a heater 5 and a fan 6, the heater 5 is positioned at the upstream of the fan 6 (namely the upstream where the air flows), the fan blows hot air heated by the heater 5 in the return air duct into the wire feeding channel 10 ', and the fan 6 enables the hot air to circulate through the air outlet device 2', the wire feeding channel 10 'and the return air device 3'. In addition, a filter screen 7 is also installed in the return air duct, and the filter screen 7 is positioned at the upstream of the heater 5 so as to filter the hot air recovered from the wire feeding channel into the return air duct and remove impurities in the hot air.
As shown in fig. 2-4, the air outlet device 2 'of the present embodiment is installed in the middle of the filament running channel 10' along the length direction thereof, and includes eight distributors 20 (not limited to eight distributors, which can be designed according to actual needs) arranged at vertical intervals, and the vertical intervals between adjacent distributors form a tow channel a through which fibers pass so as to pass through. As shown in fig. 5, the distributor 20 is communicated with the downstream end of each return air duct, the left and right ends of the distributor 20 are respectively provided with a first air outlet 20a communicated with the filament transport channel 10 ', and the air outlet direction of the first air outlet 20a is parallel to the filament transport direction (i.e. horizontal direction), so that the hot air is uniformly blown into the left and right ends of the filament transport channel 10'. In addition, the upper side and the lower side of the distributor 20 are respectively provided with a second air outlet 20b communicated with the filament moving channel 10', and the air outlet direction of the second air outlet 20b faces to the corresponding filament bundle channel a, so that the filament bundle channel a is kept stable in hot air supply, and the filament bundle channel is prevented from easily forming a windless dead zone to influence the preoxidation treatment of the fibers.
Specifically, as shown in fig. 5 to 8, the dispenser 20 includes a first box 201 and a second box 202 arranged at intervals along the wire running direction, the first box 201 is located at the left side of the second box 202, and the first box 201 and the second box 202 are in a rotational symmetric structure, and the rotation angle is 180 °; the first box 201 is communicated with the downstream end of the left return air duct, and the second box 202 is communicated with the downstream end (positive pressure end) of the right return air duct; the first box 201 is provided with a first cavity 201a and a second cavity 201b which are not communicated with each other, and the second box 202 is provided with a third cavity 202a and a fourth cavity 202b which are not communicated with each other; a first air outlet 20a of the distributor is positioned at the left side of the first cavity 201a of the first box body, the other first air outlet is positioned at the right side of the third cavity 202a of the second box body, and hot air is uniformly blown into the left end and the right end of the wire feeding channel 10' through the two first air outlets; a second air outlet of the distributor is positioned at the upper side of the second cavity 201b of the first box body, and the other second air outlet is positioned at the lower side of the fourth cavity 202b of the second box body; the lower side of the second cavity 201b of the first box body is of a first inclined plane structure, and the upper side of the fourth cavity 202b of the second box body is of a second inclined plane structure matched with the first inclined plane structure; after the first box body and the second box body are assembled, the second cavity of the first box body is in cross fit with the fourth cavity of the second box body, so that the second air outlet of the second cavity of the first box body is opposite to the second air outlet of the fourth cavity of the second box body, the space is saved, and the defect that a windless dead zone is easily formed in a tow channel is overcome.
the air return devices 3 'of the embodiment are arranged at the left end and the right end of the wire moving channel 10'; the air return devices 3 'are in one-to-one correspondence with the air return air channels 11', namely the air return device at the left end corresponds to the left air return air channel, and the air return device at the right end corresponds to the right air return air channel, so that hot air in the wire moving channel is returned to the corresponding air return air channel. In this embodiment, only the air return device at the left end is used for illustration, and the air return device at the right end and the air return device at the left end are symmetrically installed, which is not described herein; specifically, as shown in fig. 2 and 8, the air return device 3 ' includes eight (not limited to eight, and may be designed according to actual needs) air return boxes 30 of the present embodiment arranged at vertical intervals from each other, and the air return boxes 30 are respectively communicated with the wire running channel 10 ' and the upstream end (i.e., the negative pressure end) of the air return duct 11 '.
The air return boxes at the left end of the wire feeding channel, the distributor in the middle and the air return boxes at the right end correspond to each other one by one, the vertical distance between the adjacent air return boxes at the left end serves as a space for fiber to be communicated, and the vertical distance between the adjacent air return boxes at the right end serves as a space for fiber to be communicated. As shown in fig. 2, guide rollers 4' are provided at both ends of the furnace body for guiding the fibers s to pass through the through holes, the vertical space between the adjacent air return boxes, and the tow passage between the adjacent distributors in a serpentine distribution, thereby facilitating the pre-oxidation treatment of the fibers.
The pre-oxidation furnace of the embodiment is used for manufacturing carbon fibers, and the pre-oxidation treatment effect is good.
example two:
The difference between the return air box for the pre-oxidation furnace of the present example and the first example is that:
as shown in fig. 9, the first return air inlet of the first box body of the embodiment is provided with a first mesh plate 3, the second return air inlet of the second box body is provided with a second mesh plate 4, and the uniformity and stability of the return air are improved by the arrangement of the mesh plates.
Other structures can refer to the first embodiment.
accordingly, the return air box for a pre-oxidation furnace of the present example is different from the first example in that:
The first mesh plate 3 and the second mesh plate 4 are easy to block when the pre-oxidation furnace moves for a long time; therefore, the first mesh plate and the second mesh plate need to be cleaned online, specifically, as shown in fig. 10 and 11, the furnace body of the embodiment has drawing and inserting ports C corresponding to the first mesh plate and the second mesh plate one by one, respectively, and the drawing and inserting ports C are provided with heat preservation sealing plugs D. The first mesh plate or the second mesh plate can be pulled out by pulling out the heat-preservation sealing plug, so that online cleaning is realized, and the device is very convenient and fast.
In addition, an air suction channel E is also arranged corresponding to the extraction opening C; when the heat-insulating sealing plug D is separated from the extraction opening C, the air suction channel E recovers the air flow overflowing from the extraction opening. Specifically, a sealing sleeve F is arranged corresponding to each extraction socket C, and extends out of the furnace body to form an airflow channel for communicating the inside and the outside of the furnace body; as shown in fig. 12, the extending end of the sealing sleeve F is provided with a plug port F0, and the extraction plug port C of the furnace body is communicated with the outside through the airflow channel of the sealing sleeve and the plug port F0 in sequence; the heat-insulating sealing plug D is inserted into the insertion port F0 of the sealing sleeve and extends to the extraction port C of the furnace body; the two sides of each sealing sleeve F in the same vertical direction are respectively communicated with the same air suction channel E through respective connecting pipes G, so that toxic and harmful gases overflowing from the suction insertion port C are recycled to the same air suction channel E and are discharged through an exhaust gas pipe; as shown in fig. 13, the size of the air suction channel E is linearly increased from bottom to top, so that toxic and harmful gases are effectively recovered; in the on-line cleaning process, the pressure of at least-300 Pa is required to be provided for the exhaust pipe where the air suction channel is positioned, and the recovery effectiveness is ensured.
And a first sealing ring H is arranged between the heat-insulating sealing plug D and the drawing and inserting port C of the furnace body, and a second sealing ring I is arranged between the heat-insulating sealing plug D and the sealing sleeve F, so that the sealing performance inside and outside the furnace body is ensured. In addition, the communication position of the sealing sleeve F and the connecting pipe G is positioned between the first sealing ring H and the second sealing ring I, so that the toxic and harmful gas overflowing from the pumping and inserting port C is effectively sucked by the connecting pipe. The heat-insulating sealing plug D is provided with two seals, and when one sealing ring is removed, the air suction channel is communicated with the corresponding furnace inner space or the corresponding furnace outer space through a connecting pipe; when a certain sealing ring is installed in place, the air suction channel is separated from the corresponding space inside the furnace or the space outside the furnace.
in order to ensure the sealing reliability of the heat-insulating sealing plug D, a pressing door L is further installed corresponding to the plug-in port F0 of the sealing sleeve and used for opening or closing the plug-in port F0 of the sealing sleeve; when the pressing door is closed at the insertion port of the sealing sleeve, the inner side of the pressing door is in compression fit with the heat-insulating sealing plug, so that the sealing reliability of the heat-insulating sealing plug D is ensured.
The pre-oxidation furnace of the embodiment is used for manufacturing carbon fibers, and the pre-oxidation treatment effect is good.
Other structures can refer to the first embodiment.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (10)
1. The air return box for the pre-oxidation furnace is characterized by comprising a first box body and a second box body which are sequentially arranged along the air return direction of the pre-oxidation furnace, wherein the first box body and the second box body are distributed at a preset interval;
One side of the first box body facing the air return direction is provided with a first air return opening;
The second box body comprises a return air cavity and a fresh air cavity which are sequentially distributed along the return air direction of the pre-oxidation furnace, one side of the return air cavity facing the return air direction is provided with a second return air inlet, and the fresh air cavity is provided with a fresh air inlet for introducing fresh air.
2. the air return box for the pre-oxidation furnace as claimed in claim 1, wherein the fresh air chamber has a fresh air inlet communicated with the outside.
3. the air return box for the pre-oxidation furnace as claimed in claim 1, wherein the air outlet direction of the fresh air inlet of the fresh air cavity is perpendicular to the air return direction of the pre-oxidation furnace.
4. The air return box for the pre-oxidation furnace as claimed in claim 3, wherein the fresh air inlet of the fresh air cavity is circumferentially distributed in a direction perpendicular to the return air direction of the pre-oxidation furnace.
5. the air return box for the pre-oxidation furnace as set forth in claim 1, wherein the predetermined distance between the first and second boxes is greater than 60 mm.
6. the air return box for the pre-oxidation furnace as claimed in claim 1, wherein the first return air inlet of the first box is provided with a first mesh plate, and the second return air inlet of the second box is provided with a second mesh plate.
7. A pre-oxidation oven characterized in that a plurality of return air boxes according to any one of claims 1 to 6 are provided in the pre-oxidation oven at intervals perpendicular to the return air direction.
8. The pre-oxidation furnace of claim 7, wherein the pre-oxidation furnace is provided with drawing and inserting ports corresponding to the first mesh plate and the second mesh plate respectively, and the drawing and inserting ports are provided with heat-preservation sealing plugs.
9. The pre-oxidation oven according to claim 8, wherein a suction passage is provided corresponding to the suction port; when the heat-insulating sealing plug is separated from the extraction opening, the air suction channel recovers the air flow overflowing from the extraction opening.
10. The pre-oxidation oven according to claim 7, wherein the pre-oxidation oven is used for manufacturing carbon fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910880394.7A CN110578189B (en) | 2019-09-18 | 2019-09-18 | Return air case and pre-oxidation stove for pre-oxidation stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910880394.7A CN110578189B (en) | 2019-09-18 | 2019-09-18 | Return air case and pre-oxidation stove for pre-oxidation stove |
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| CN110578189A true CN110578189A (en) | 2019-12-17 |
| CN110578189B CN110578189B (en) | 2024-03-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457464A (en) * | 2022-02-28 | 2022-05-10 | 新创碳谷控股有限公司 | Carbon fiber oxidation furnace capable of reducing vibration of tows |
| CN114561722A (en) * | 2022-03-17 | 2022-05-31 | 新创碳谷控股有限公司 | Carbon fiber pre-oxidation furnace with end labyrinth seal structure |
| 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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| CN114457464B (en) * | 2022-02-28 | 2022-07-22 | 新创碳谷控股有限公司 | Carbon fiber oxidation furnace capable of reducing vibration of tows |
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