CN101956248A - Low-temperature carbide furnace for producing continuous carbon fibers - Google Patents
Low-temperature carbide furnace for producing continuous carbon fibers Download PDFInfo
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- CN101956248A CN101956248A CN 201010285192 CN201010285192A CN101956248A CN 101956248 A CN101956248 A CN 101956248A CN 201010285192 CN201010285192 CN 201010285192 CN 201010285192 A CN201010285192 A CN 201010285192A CN 101956248 A CN101956248 A CN 101956248A
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- burner hearth
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Abstract
The invention belongs to a low-temperature carbide furnace for producing continuous carbon fibers. The low-temperature carbide furnace comprises a furnace body (1), a hearth (2) arranged in the furnace body (1), an insulating layer (4), a fire-resistant layer (3), a heating element (5) and an exhaust pipe (6), wherein the insulating layer (4), the fire-resistant layer (3), and the heating element (5) are arranged between the furnace body (1) and the hearth (2) from outside to inside and the exhaust pipe (6) is communicated with the hearth (2) and atmosphere. The low-temperature carbide furnace is characterized in that the exhaust pipe (6) is arranged on the tail of the furnace body close to a bundle outlet (12). The low-temperature carbide furnace solves the technical problems of unsmooth waste gas exhaust and accumulation of waste gas during the carbonization of pre-oxidized fibers due to unreasonable hearth structure of the conventional carbide furnace, ensures the stabilization and continuity of the carbonization process of the pre-oxidized fibers, and improves the production efficiency of the carbon fibers.
Description
Technical field
The invention belongs to the new material production field, relate to a kind of carbon fiber production equipment, specifically a kind of low temperature carbonization furnace that is used to produce continuous carbon fibre.
Background technology
Carbon fiber is a kind of new carbon, has high specific strength, high ratio modulus, high temperature resistant, corrosion-resistant, creep resistant, low-thermal-expansion, high conduction and a series of excellent properties such as heat conduction, self-lubricating; And as fiber also have flexibility and can compile, weaving property, be widely used in civilian industries such as leading-edge fields such as space flight and aviation, national defense and military and senior Leisure Sport articles for use, medicine equipment, become one of main enhancing body of advanced composite material, be described as the most vital new material in 21 century.
In polyacrylonitrile (PAN) base carbon fibre production process, usually the PAN precursor is carried out pre-oxidation treatment in 200-300 ℃ of air atmosphere and make pre-oxidized fibers, then pre-oxidized fibers is successively carried out low-temperature carbonization and high temperature cabonization respectively and handle and make phosphorus content in the inert atmosphere of 300-900 ℃ and 1000-1800 ℃, then above-mentioned carbon fiber is carried out graphitization processing and makes high modulus carbon fiber (also claiming graphite fibre) in 2000-3000 ℃ of inert atmosphere at the carbon fiber more than 90%.Wherein, in above-mentioned carbonisation, pre-oxidized fibers is converted into the carbon fiber with random graphits structure by heat-resisting trapezium structure by reactions such as crosslinked, polycondensations; Being accompanied by said structure transforms, there is the quality (with respect to pre-oxidized fibers) of 30-40% to overflow approximately, and is discharged to the outer exhaust treatment system of carbide furnace by exhaust outlet with the inert gas in the carbide furnace with the form pyrolysis of carbonization waste gas and small molecule by-product.As shown in Figure 1, structural representation for original low temperature carbonization furnace, wherein, (a) for the carbonization waste gas that produces in the carbide furnace course of work and flow to schematic diagram, (b) be that attachment such as tar and shows the state that drops under these attachments on the fibre bundle at inboard, top and the adhesion condition on every side thereof of the tow import and the outlet of carbide furnace in the carbonisation; As can be seen from Figure 1, in carbon fiber production process, because burner hearth 2 structural designs of carbide furnace are unreasonable, it is not smooth to cause carbonization waste gas 14 to be discharged, and partially carbonized waste gas 14 is condensed into tar 15 attached to inboard, the top of the tow import of carbide furnace and outlet and locate on every side in stove; Tar following of tar to a certain degree will occur in stove inwall deposition, pollute fibre bundle 10, gently then hardening, embrittlement, and heavy then fracture of wire, thus influence the serialization production of carbon fiber, the production efficiency of reduction carbon fiber.
Summary of the invention
Technical problem not smooth, that waste gas is piled up that the waste gas of the generation when causing the pre-oxidized fibers carbonization for the chamber structure that solves existing carbide furnace is unreasonable is discharged the invention provides a kind of low temperature carbonization furnace that is used to produce continuous carbon fibre.
Technical solution of the present invention is:
A kind of low temperature carbonization furnace that is used to produce continuous carbon fibre, comprise body of heater 1, be arranged on heat-insulation layer 4, flame retardant coating 3 and heating element heater 5 that sets gradually from outside to inside between burner hearth 2, body of heater 1 and the burner hearth 2 in the body of heater 1 and the blast pipe 6 that connects burner hearth 2 and atmosphere, its special character is: described blast pipe 6 is arranged on the body of heater afterbody near synnema outlet 12.
Above-mentioned near synnema inlet 11 the burner hearth upper wall surface and the angle between the horizontal plane be 2～30 ° and this place burner hearth upper wall surface height along the increase of fibre bundle 10 traffic directions linearity.
Above-mentioned burner hearth upper wall surface and the angle between the horizontal plane near synnema inlet 11 is 5～20 °.
The beneficial effect that the present invention had:
The place ahead upper wall surface of the burner hearth of the low temperature carbonization furnace of the present invention by will being used to produce continuous carbon fibre is designed to become with horizontal plane 2～30 ° of angles, and blast pipe is arranged on the body of heater afterbody, can avoid forming the dead angle, the materials such as waste gas that pre-oxidized fibers can be produced in carbonisation in time discharge out of the furnace, avoid owing to waste gas for a long time in burner hearth the low temperature place stop and to be condensed into tar, and then prevent materials such as tar adhere at inboard wall of burner hearth, following, pollute fiber, cause fibre property decline, tow fracture.Guarantee the stabilisation and the serialization of pre-oxidized fibers carbonisation, improved the production efficiency of carbon fiber.
Description of drawings
Fig. 1 is existing low temperature carbonization furnace structural representation; Wherein a is for having the carbonization waste gas that produces in the carbide furnace course of work now and flowing to schematic diagram, and b is the structural representation that tar adheres at inboard wall of burner hearth;
Fig. 2 is a structural representation of the present invention;
Wherein: 1-body of heater, 2-burner hearth, 3-flame retardant coating, 4-heat-insulation layer, 5-heating element heater, 6-blast pipe, 7-stove outer covering, 8-sealing device, 10-fibre bundle, the import of 11-tow, the outlet of 12-tow, 13-inert gas import, 14-waste gas, 15-tar.
The specific embodiment
The low temperature carbonization furnace that the present invention is used to produce continuous carbon fibre comprises burner hearth 2, flame retardant coating 3, heat-insulation layer 4, heating element heater 5, blast pipe 6, stove outer covering 7, sealing device 8 as shown in Figure 2.Wherein, burner hearth 2 cross sections are a rectangular cross section, adopt high temperature resistant, corrosion resistance material to make; Between stove outer covering 7 and burner hearth 2, be provided with heating element heater 5, flame retardant coating 3 and heat-insulation layer 4 from the inside to the outside; Heating element heater 5 is used in fibre bundle traffic direction formation thermograde from low to high; Sealing device 8 is connected with tow outlet 12 with the tow import 11 of carbide furnace body of heater 1 by flange, securing member etc., be used to guarantee be in the stove pressure-fired inert atmosphere, suppress the outer indoor air of stove and infiltrate in the stove, prevent that simultaneously the carbonization waste gas in the stove is disposed to outside the stove through import 11 of carbide furnace tow and tow outlet 12; Blast pipe 6 is arranged on the top of burner hearth 2, and is upward through flame retardant coating 3, heat-insulation layer 4, stove outer covering 7, extends to carbide furnace body of heater 1 outer certain distance.
The place that the burner hearth 2 of low temperature carbonization furnace 1 is finished its low-temperature carbonization technology for fibre bundle 10 mainly is made up of four parts such as fibre bundle inducer I, introduction segment II, main paragraph III, outlet section IV.In order to prevent the gathering of tar, the burner hearth upper wall surface and the horizontal plane of fibre bundle introduction segment have certain included angle θ, general θ gets 2～30 °, be preferably 5～20 °, and the burner hearth upper wall surface of fibre bundle introduction segment apart from the distance on plane, fibre bundle 10 place along fibre bundle 10 traffic directions linear increasing; The burner hearth upper wall surface of fibre bundle main paragraph is the level of state, and its upper wall surface height is consistent with the burner hearth upper wall surface height of fibre bundle introduction segment end; Fibre bundle introduction segment below is provided with inert gas induction part 13, be used in stove, feeding a certain amount of inert gas, take away the waste gas 14 that fibre bundle 10 is produced when guaranteeing to be the pressure-fired inert atmosphere in the stove in carbonisation, finally enter exhaust treatment system outside the stove through blast pipe 6; The airintake direction of inert gas should be along the traffic direction of fibre bundle in the stove 10, and air inflow evenly distributes better in burner hearth 2 cross sections.
Heating element heater 5 is made up of multistage, and fibre bundle 10 traffic directions in burner hearth 2 form thermograde from low to high, and its temperature range is 300～900 ℃; The kind and the shape of heating element heater 5 do not have particular provisions, adopt the high-temperature electric resistance furnace silk usually, and its shape can adopt bar-shaped, tabular, planar or snakelike shape.
When adopting low temperature carbonization furnace of the present invention to work, the tow import 11 of pre-oxidized fibers 10 through sealing device 8, carbide furnace imported in the burner hearth 2, through the tow of carbide furnace outlet 12, sealing device 8 fibre bundle is derived carbide furnace then, finish the low-temperature carbonization of pre-oxidized fibers and handle.In above-mentioned processing procedure, to produce waste gas 14, because the area of space of burner hearth fibre bundle introduction segment is narrow, waste gas is difficult for stopping, for example, under the effect of inert gas driving force, move to burner hearth fibre bundle outlet section direction, finally enter exhaust treatment system outside the stove from blast pipe 6 along the gas passage.
Adopt specific embodiment that the present invention is done more detailed explanation below.
In low temperature carbonization furnace of the present invention PAN base fibre bundle is carried out low-temperature carbonization and handle, the fiber speed of service is 60m/h.Burner hearth 2 total length L of low temperature carbonization furnace are 10m, and wherein, the length of fibre bundle inducer, introduction segment, main paragraph and outlet section is respectively 0.5m (L
I), 0.6m (L
II), 8.4m (L
III), 0.5m (L
IV), blast pipe 6 right side walls are 0.1m apart from the length of fibre bundle main paragraph end; Burner hearth 2 cross section overall height H are 0.18m, wherein, and fibre bundle inducer depth of section H
IThe height that moves place plane separation burner hearth 2 upper wall surfaces for fibre bundle in 0.08m, the fibre bundle introduction segment cross section 10 increases to 0.14m (H by the 0.04m linearity
II), in the main paragraph cross section fibre bundle 10 operation planes, place to the height H of burner hearth 2 upper wall surfaces
IIIBe 0.14m, fibre bundle outlet section depth of section H
IVBe 0.08m, the angle theta on the burner hearth upper wall of fibre bundle introduction segment and plane, fibre bundle 10 place is 9.5 °; Burner hearth 2 cross section overall width B are 0.6m; Heating element heater 5 in the low temperature carbonization furnace is made up of multistage, the traffic direction formation thermograde from low to high of the fibre bundle 10 in can sub-burner hearth 2, and its temperature range is 300～900 ℃, and can set 6 warm areas at most.
Under these conditions, low temperature carbonization furnace of the present invention moves two months continuously, does not find following of material, pollution fiber phenomenons such as tar in the burner hearth; Burner hearth out of service, as to check low temperature carbonization furnace found that at fibre bundle introduction segment, main paragraph etc. and locates that extremely slight attachment deposition is only arranged.
Claims (3)
1. low temperature carbonization furnace that is used to produce continuous carbon fibre, comprise body of heater (1), be arranged on heat-insulation layer (4), flame retardant coating (3) and heating element heater (5) that sets gradually from outside to inside between burner hearth (2), body of heater (1) and the burner hearth (2) in the body of heater (1) and the blast pipe (6) that connects burner hearth (2) and atmosphere, it is characterized in that: described blast pipe (6) is arranged on the body of heater afterbody near synnema outlet (12).
2. the low temperature carbonization furnace that is used to produce continuous carbon fibre according to claim 1 is characterized in that: described near synnema inlet (11) the burner hearth upper wall surface and the angle between the horizontal plane be 2～30 ° and this place burner hearth upper wall surface height along the increase of fibre bundle (10) traffic direction linearity.
3. the low temperature carbonization furnace that is used to produce continuous carbon fibre according to claim 2 is characterized in that: described burner hearth upper wall surface and the angle between the horizontal plane near synnema inlet (11) is 5～20 °.
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| CN 201010285192 CN101956248A (en) | 2010-09-17 | 2010-09-17 | Low-temperature carbide furnace for producing continuous carbon fibers |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644132A (en) * | 2012-04-25 | 2012-08-22 | 上海联川自动化科技有限公司 | High-temperature carbide furnace for manufacturing carbon fiber by charging gas after vacuum pumping |
| CN102691134A (en) * | 2012-06-07 | 2012-09-26 | 中钢集团江城碳纤维有限公司 | Method for producing and guiding carbon fiber by using high-temperature carbonization furnace and high-temperature carbonization furnace thereof |
| CN104395514A (en) * | 2012-06-27 | 2015-03-04 | 三菱丽阳株式会社 | Carbonization furnace for manufacturing carbon fiber bundles and method for manufacturing carbon fiber bundles |
| CN106367850A (en) * | 2016-02-22 | 2017-02-01 | 河北陆元新材料科技有限公司 | Continuous production system of polyacrylonitrile-based carbon fibers |
| CN107541810A (en) * | 2017-09-18 | 2018-01-05 | 中安信科技有限公司 | The tracing system of carbon fibre carbonizing furnace exhaust pipeline |
| CN110241482A (en) * | 2019-07-08 | 2019-09-17 | 广州赛奥碳纤维技术有限公司 | A method of producing the low temperature carbonization furnace and quick-replaceable furnace muffle of carbon fiber |
| CN112760753A (en) * | 2021-01-18 | 2021-05-07 | 荣成碳纤维科技有限公司 | Vertical low-temperature carbonization furnace and production process thereof |
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| CN201817599U (en) * | 2010-09-17 | 2011-05-04 | 西安航科等离子体科技有限公司 | Low-temperature carbonizing furnace used for producing continuous carbon fibers |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644132A (en) * | 2012-04-25 | 2012-08-22 | 上海联川自动化科技有限公司 | High-temperature carbide furnace for manufacturing carbon fiber by charging gas after vacuum pumping |
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| CN102691134A (en) * | 2012-06-07 | 2012-09-26 | 中钢集团江城碳纤维有限公司 | Method for producing and guiding carbon fiber by using high-temperature carbonization furnace and high-temperature carbonization furnace thereof |
| CN102691134B (en) * | 2012-06-07 | 2013-09-11 | 中钢集团江城碳纤维有限公司 | Method for producing and guiding carbon fiber by using high-temperature carbonization furnace and high-temperature carbonization furnace thereof |
| CN104395514A (en) * | 2012-06-27 | 2015-03-04 | 三菱丽阳株式会社 | Carbonization furnace for manufacturing carbon fiber bundles and method for manufacturing carbon fiber bundles |
| CN104395514B (en) * | 2012-06-27 | 2016-08-24 | 三菱丽阳株式会社 | Carbon fiber bundle manufacture carbide furnace and the manufacture method of carbon fiber bundle |
| CN106367850A (en) * | 2016-02-22 | 2017-02-01 | 河北陆元新材料科技有限公司 | Continuous production system of polyacrylonitrile-based carbon fibers |
| CN106367850B (en) * | 2016-02-22 | 2018-09-25 | 河北陆元新材料科技有限公司 | A kind of continuous production system of polyacrylonitrile-based carbon fibre |
| CN107541810A (en) * | 2017-09-18 | 2018-01-05 | 中安信科技有限公司 | The tracing system of carbon fibre carbonizing furnace exhaust pipeline |
| CN110241482A (en) * | 2019-07-08 | 2019-09-17 | 广州赛奥碳纤维技术有限公司 | A method of producing the low temperature carbonization furnace and quick-replaceable furnace muffle of carbon fiber |
| CN110241482B (en) * | 2019-07-08 | 2024-03-26 | 广州赛奥碳纤维技术有限公司 | Low-temperature carbonization furnace for producing carbon fibers and method for rapidly replacing muffle furnace chamber |
| CN112760753A (en) * | 2021-01-18 | 2021-05-07 | 荣成碳纤维科技有限公司 | Vertical low-temperature carbonization furnace and production process thereof |
| CN112760753B (en) * | 2021-01-18 | 2023-01-17 | 荣成碳纤维科技有限公司 | Vertical low-temperature carbonization furnace and production process thereof |
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Open date: 20110126 |