JPH04163322A - Furnace for flame-resisting treatment - Google Patents
Furnace for flame-resisting treatmentInfo
- Publication number
- JPH04163322A JPH04163322A JP28295990A JP28295990A JPH04163322A JP H04163322 A JPH04163322 A JP H04163322A JP 28295990 A JP28295990 A JP 28295990A JP 28295990 A JP28295990 A JP 28295990A JP H04163322 A JPH04163322 A JP H04163322A
- Authority
- JP
- Japan
- Prior art keywords
- flame
- furnace
- fluidized bed
- fibers
- precursor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 claims abstract description 71
- 239000002243 precursor Substances 0.000 claims abstract description 51
- 239000002245 particle Substances 0.000 claims abstract description 26
- 230000001590 oxidative effect Effects 0.000 claims abstract description 21
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 26
- 239000003063 flame retardant Substances 0.000 claims description 26
- 239000011148 porous material Substances 0.000 abstract 5
- 239000007789 gas Substances 0.000 description 36
- 238000010438 heat treatment Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 230000035939 shock Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009172 bursting Effects 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920006282 Phenolic fiber Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Inorganic Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、前駆体繊維を耐炎化する耐炎化繊維の製造工
程に利用される耐炎化処理炉に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a flame-retardant treatment furnace used in a process for producing flame-retardant fibers that flame-retardizes precursor fibers.
〈従来の技術〉
通常、耐炎化繊維は、ポリアクリロニトリル（以下ＰＡ
Ｎと略す）系繊維、再生セルローズ系繊維、フェノール
系繊維、ピッチ系繊維等の有機重合体から成る前駆体繊
維を先ず空気または他の酸化性ガス雰囲気中にて、２０
０〜３００°Ｃで耐炎化（ピッチ系繊維では一般に不融
化と称しており、更に高温の４５０°Ｃ程度までの処理
を行っている）して得られる。このようにして耐炎化さ
れた繊維は、次いで窒素、アルゴン等の不活性ガス雰囲
気中にて８００〜２０００°Ｃで炭化せしめて炭素繊維
としたり、また、さらに２０００“Ｃ以上の不活性ガス
雰囲気中で黒鉛化を行い、弾性率が一段と高い黒鉛繊維
を製造することも行われる。<Conventional technology> Flame-resistant fibers are usually made of polyacrylonitrile (hereinafter referred to as PA
First, precursor fibers made of organic polymers such as N)-based fibers, recycled cellulose-based fibers, phenolic fibers, and pitch-based fibers are heated in an atmosphere of air or other oxidizing gas for 20 min.
It is obtained by making it flame resistant at 0 to 300°C (generally called infusibility for pitch fibers, which is further treated at a high temperature of about 450°C). The flame-resistant fibers are then carbonized at 800 to 2,000°C in an inert gas atmosphere such as nitrogen or argon to form carbon fibers, or further heated at 2,000°C or more in an inert gas atmosphere. Graphitization is also carried out inside to produce graphite fibers with a higher modulus of elasticity.
一ヒ記耐炎化工程は酸化と連化を伴う反応であって、高
温で処理する程反応速度を上げて耐炎化に必要な処理時
間を短縮できる。しかしながら、反応発熱を伴うため、
処理温度を高温にし過ぎたり、前駆体繊維を高密度に多
数充愼したりすると、反応熱が該繊維内に蓄積して単糸
間の融着や糸切れ、場合によっては発火現象を生しる。The flameproofing process described above is a reaction involving oxidation and entrainment, and the higher the temperature, the faster the reaction rate and the shorter the treatment time required for flameproofing. However, since the reaction is accompanied by exothermic heat,
If the processing temperature is too high or a large number of precursor fibers are packed at a high density, reaction heat will accumulate within the fibers, causing fusion between single fibers, fiber breakage, and in some cases, ignition. Ru.
そのため、耐炭化工程の生産効率を上げるためには、当
該繊維の反応発熱を効率良く除去しつつ可能な限り高温
で処理できるプロセスであることが肝要である。Therefore, in order to increase the production efficiency of the carbonization process, it is important that the process can be performed at as high a temperature as possible while efficiently removing the heat generated by the reaction of the fibers.
その耐炎化処理としては、特開平１−１９２８２５号公
報に記載されているように、種々の処理方法が提案実施
されているが、特に、前駆体繊維の加熱効率の向上、使
用熱量の削減を図る方法として、熱媒粒子の流動層を用
いて前駆体繊維を耐炎化する処理方法があり、この公報
では第６図に示すような耐炎化処理炉を提案している。As for flame-retardant treatment, various treatment methods have been proposed and implemented, as described in JP-A-1-192825, but in particular, improvements in the heating efficiency of the precursor fiber and reduction in the amount of heat used have been proposed. As a method for achieving this, there is a treatment method in which a fluidized bed of heat transfer particles is used to make the precursor fiber flame resistant, and this publication proposes a flame resistant treatment furnace as shown in FIG.
図中、符号１はその耐炎化処理炉の縦断面を示すもので
、炉１内の長手方向に設置された分散板２によって、炉
１内は２層に分割された状態になっている。分散板２の
下方（図面上の下側）はガス分散箱３に構成されており
、ガス分離箱３には、酸化性気体（図中、矢印で示して
いる）を導くガス通路５が連通接続されている。分散板
２の上方は、熱媒粒子を所定範囲の糸道高さまで堆積し
た熱媒層４に構成されており、被処理物である前駆体繊
維Ｔは、ローラ７．７を介して、この熱媒層４に通糸さ
れるように構成されている。In the figure, reference numeral 1 indicates a longitudinal section of the flame-retardant treatment furnace, and the inside of the furnace 1 is divided into two layers by a distribution plate 2 installed in the longitudinal direction of the inside of the furnace 1. A gas distribution box 3 is configured below the distribution plate 2 (lower side in the drawing), and a gas passage 5 for guiding oxidizing gas (indicated by an arrow in the drawing) communicates with the gas separation box 3. It is connected. Above the dispersion plate 2 is a heating medium layer 4 in which heating medium particles are deposited up to a yarn path height within a predetermined range. It is configured to be threaded through the heat medium layer 4.
このような耐炎化処理炉１によると、ガス通路５に設け
られたヒータ６により、加熱された酸化性気体（図中、
矢印で示している）はガス分離籍３内に流入し、分散板
２を通過する前に、ガス分散箱３内で均一に広がる。そ
して、分散板２で分散されたのち、熱媒Ｎ４内に流入し
、熱媒層４を流動化して流動層にするとともに、その流
動層を均一に加熱する。この状態下で、ローラ７．７を
介して、前駆体繊維Ｔを流動層内に通過させると、前駆
体繊維Ｔに耐炎化処理が施される。According to such a flameproofing treatment furnace 1, the oxidizing gas (in the figure) heated by the heater 6 provided in the gas passage 5 is heated.
) flows into the gas separator 3 and spreads out uniformly in the gas distribution box 3 before passing through the distribution plate 2 . After being dispersed by the dispersion plate 2, the heat medium flows into the heat medium N4, fluidizes the heat medium layer 4 to form a fluidized bed, and uniformly heats the fluidized bed. Under these conditions, the precursor fibers T are passed through the fluidized bed via the rollers 7.7, whereupon the precursor fibers T are subjected to a flameproofing treatment.
〈発明が解決しようとする課題〉
しかしながら、上述した構造の耐炎化処理炉１で、さら
に、耐炎化処理速度を速めて、耐炎化繊維の生産性を向
上させようとすると、次のような不都合が生じる。<Problems to be Solved by the Invention> However, when trying to further speed up the flame-retardant treatment and improve the productivity of flame-retardant fibers with the flame-retardant treatment furnace 1 having the above-described structure, the following disadvantages arise. occurs.
耐炎化処理速度を速めるには、まず、耐炎化処理炉１の
長さを長くし、炉１内に挿入される前駆体繊維Ｔの処理
速度を増加させることが考えられる。In order to speed up the flameproofing treatment speed, it is conceivable to first increase the length of the flameproofing treatment furnace 1 and increase the treatment rate of the precursor fibers T inserted into the furnace 1.
しかし、この場合、耐炎化処理炉１を長尺化すると、前
駆体繊維Ｔの中央部あたりが、熱媒体粒子の流動化作用
により、糸道に振れが生じて糸道が不安定となるため、
両サイドの糸束同士で接触を起こし、毛羽等の発生を助
長し、得られた耐炎化繊維の品位を著しく低下させる恐
れがある。また、耐炎化処理炉１の必要以上の長尺化ば
、設備費の点でもコスト高につながり、好ましくない。However, in this case, when the length of the flame-retardant treatment furnace 1 is increased, the yarn path becomes unstable due to vibrations in the central part of the precursor fiber T due to the fluidization effect of the heat transfer medium particles. ,
There is a risk that the yarn bundles on both sides will come into contact with each other, promoting the generation of fuzz, etc., and significantly reducing the quality of the obtained flame-resistant fiber. Moreover, if the length of the flame-retardant treatment furnace 1 is longer than necessary, it will lead to an increase in equipment costs, which is not preferable.
そこで、耐炎化処理炉１を長尺化せずに、前駆体繊維Ｔ
の処理速度を増やすには、熱媒層４（以下、流動層とも
言う）の高さを高くし、流動層４内を通過する前駆体繊
維Ｔの処理段数を増す、つまり、前駆体繊維Ｔを多段に
折り返して、“１“炉当たりの処理長を増加させること
が考えられる。Therefore, without increasing the length of the flameproofing furnace 1, the precursor fiber T
In order to increase the processing speed, the height of the heat medium layer 4 (hereinafter also referred to as fluidized bed) is increased, and the number of processing stages of the precursor fiber T passing through the fluidized bed 4 is increased. It is conceivable to increase the processing length per "1" furnace by folding it back into multiple stages.
だが、流動層４を高くすると、流動層４内で発生した酸
化性気体の気泡が著しく成長合体し、流動層４の表面付
近ではかなり大きな気泡となる。However, when the height of the fluidized bed 4 is increased, the oxidizing gas bubbles generated within the fluidized bed 4 significantly grow and coalesce, forming considerably large bubbles near the surface of the fluidized bed 4.
この成長した大きな気泡が、前駆体繊維Ｔに衝突して破
裂すると、そのときのショックで、前駆体繊維Ｔがばら
け、毛羽等の物理的損傷を与えるという不都合が生じる
。When this grown large bubble collides with the precursor fiber T and ruptures, the shock generated at that time causes the precursor fiber T to come apart and cause physical damage such as fuzz.
また、気泡破裂のショックでもバラけないように、前駆
体繊維Ｔに撚りを付与すれば、安定した通糸が可能であ
るが、余り撚り数を増すと、前駆体繊維Ｔの内外層で反
応にばらつきが生じ、得られた耐炎化繊維の品位が低下
する。あるいは、前駆体繊維Ｔ内に耐炎化反応熱が蓄熱
し、暴走反応が発生し糸切れ、場合によっては発火現象
が起きることもある。In addition, stable threading is possible by twisting the precursor fiber T so that it does not come apart even with the shock of bubble bursting, but if the number of twists is increased too much, reactions may occur in the inner and outer layers of the precursor fiber T. This causes variations in the quality of the obtained flame-resistant fibers. Alternatively, the heat of the flame-retardant reaction may accumulate within the precursor fiber T, causing a runaway reaction, resulting in thread breakage and, in some cases, a ignition phenomenon.
本発明は、このような事情に鑑みてなされたものであっ
て、上述した不都合を生じることなく、耐炎化処理速度
を向上させ、耐炎化繊維の生産性の向上を図ることがで
きる耐炎化処理炉を提供することを目的としている。The present invention has been made in view of the above circumstances, and provides a flame resistant treatment that can improve the flame resistant treatment speed and improve the productivity of flame resistant fibers without causing the above-mentioned inconveniences. The purpose is to provide a furnace.
〈課題を解決するための手段〉
本発明は、上記目的を達成するために、次のような構成
をとる。<Means for Solving the Problems> In order to achieve the above object, the present invention has the following configuration.
すなわち、加熱された酸化性気体を熱媒粒子の堆積層中
に導入して流動層とし、この流動層内に前駆体繊維を通
糸して耐炎化処理を施す耐炎化処理炉において、
前記流動層外であって、かつ、炉軸方向の両端側に、前
駆体繊維を折り返して通糸する複数個の折り返しローラ
を備えるとともに、
前記流動層内であって、かつ、前記複数個の折り返しロ
ーラで折り返された前駆体繊維の糸道間の、少なくとも
１つの間隙に多孔体を取り付けたことを特徴としている
。That is, in a flame-retardant treatment furnace in which a heated oxidizing gas is introduced into a deposited layer of heat transfer particles to form a fluidized bed, and a precursor fiber is threaded through this fluidized bed to perform a flame-retardant treatment, A plurality of folding rollers are provided outside the layer and at both ends in the furnace axis direction for folding back and threading the precursor fibers, and the plurality of folding rollers are provided within the fluidized bed and at both ends in the furnace axis direction. The present invention is characterized in that a porous body is attached to at least one gap between the thread paths of the precursor fibers folded back.
〈作用〉
本発明の面］炎化処理炉による作用は次のとおりである
。<Aspects of the present invention> The effects of the flame treatment furnace are as follows.
酸化性気体の導入により、流動層内に発生した気泡は、
流動層内に折り返し通糸される前駆体繊維の糸道間の間
隙に取り付りられた多孔体に衝突して破裂し、微小な気
泡となる。Bubbles generated in the fluidized bed due to the introduction of oxidizing gas,
The precursor fibers folded back and threaded into the fluidized bed collide with the porous bodies attached to the gaps between the thread paths and burst, forming minute bubbles.
したがって、前駆体繊維に衝突して破裂する気泡のショ
ックも和らげられ、前駆体繊維に毛羽等の物理的損傷を
与えることなく、折り返し前駆体繊維を流動層内に通糸
することが可能になり、耐炎化処理速度の向−１−が図
られる。Therefore, the shock of bubbles colliding with the precursor fibers and bursting is alleviated, making it possible to thread the folded precursor fibers into the fluidized bed without causing physical damage such as fuzz to the precursor fibers. , the speed of flame-retardant treatment is improved.
〈実施例〉 以下、本発明の実施例を図面に基づいて説明する。<Example> Embodiments of the present invention will be described below based on the drawings.
まず、第３図を参照して、耐炎化処理装置の概略を説明
する。First, with reference to FIG. 3, the outline of the flameproofing treatment apparatus will be explained.
図中、符号８ば前駆体繊維Ｔの供給部であり、ここから
送り出された前駆体繊維Ｔは、複数個のローラｌｌａ〜
ｌｉｅを介して、耐炎化処理炉２ｏ内に導かれ、その後
、耐炎化処理炉２ｏの炉軸方向の両側に設置された複数
個の折り返しローラ１２ａ −１２Ｃ，’１３ａ〜１３
ｃにより、複数回（この例では、５回）、耐炎化処理炉
２０内に通糸され、耐炎化処理を施された後、ローラ１
４ａ、］、４ｂを介して巻き取り部１５に、耐炎化繊維
として引き取られる。In the figure, reference numeral 8 is a supply section for the precursor fibers T, and the precursor fibers T sent out from here are passed through a plurality of rollers lla to
The rollers 12a-12C, '13a-13 are guided into the flame-retardant furnace 2o through a
c, the thread is threaded into the flame-retardant treatment furnace 20 multiple times (in this example, five times) and subjected to flame-retardant treatment, and then the roller 1
4a, ], 4b to the winding section 15 as flame-resistant fibers.
折り返しローラ１２ａ〜１２ｃ 、１３ａ〜１３ｃばと
もに、第４図の斜視図に示すように、前駆体繊維Ｔを折
り返すための複数個の溝４ｏを軸方向に並設した従動ロ
ーラとなっており、複数本の前駆体繊維Ｔを折り返し炉
２０内に通糸することによって、大量の前駆体繊維Ｔを
一度に耐炎化処理できるよ・うに構成されている。The folding rollers 12a to 12c and 13a to 13c are all driven rollers having a plurality of grooves 4o arranged in parallel in the axial direction for folding back the precursor fibers T, as shown in the perspective view of FIG. By threading a plurality of precursor fibers T into the folding furnace 20, a large amount of precursor fibers T can be flame-resistant treated at once.
第１図に示すように、耐炎化処理炉２０は、底面部（図
面の下側）に、酸化性気体を炉内に導入するだめの２個
の給気管２１が連設され、十面部（図面の」−側）に、
前記酸化性気体を炉外に排出するための排気管２２が連
設された中空体として形成されている。各給気管２１に
はヒータ２７が設けられており、給気管２１を通る酸化
性気体を所要温度に加熱するように構成されている。As shown in FIG. 1, the flameproofing furnace 20 has two air supply pipes 21 connected to the bottom (lower side of the drawing) for introducing oxidizing gas into the furnace, and on the "-" side of the drawing,
It is formed as a hollow body connected with an exhaust pipe 22 for discharging the oxidizing gas to the outside of the furnace. Each air supply pipe 21 is provided with a heater 27, and is configured to heat the oxidizing gas passing through the air supply pipe 21 to a required temperature.
耐炎化処理炉２０の炉軸方向の両側面部には、前記折り
返しローラ１２ａ〜１２ｃ 、１３ａ〜１３ｃによって
複数段に折り返された前駆体繊維Ｔの炉２０内への導入
を許容する複数個の導入孔２３と、炉２０外への導出を
許容する複数個の導出孔２４とが、互いに対向した状態
で形成されており、各導入孔２３および導出孔２４をそ
れぞれ囲むように、圧力シール室２５．２５が、その両
側面に取り付けられている。On both sides of the flameproofing furnace 20 in the furnace axial direction, there are a plurality of introduction holes for allowing the precursor fibers T folded in multiple stages by the folding rollers 12a to 12c and 13a to 13c to be introduced into the furnace 20. A hole 23 and a plurality of outlet holes 24 that allow the outlet to the outside of the furnace 20 are formed to face each other. .25 are attached to both sides of it.
圧力シール室２５は、炉内に導入された酸化性気体と熱
媒粒子３０が、導入孔２３や導出孔２４から外部に漏洩
しないように路孔をシールするもので、加圧気体の注入
管２６を備えた構成となっている。つまり、加圧気体を
圧力シール室２５内に供給することで、圧力シール室２
５内の雰囲気圧を、炉２０内の雰囲気圧よりも若干高め
に設定し、酸化性気体と熱媒粒子３０の外部漏洩を防ぐ
ものである。The pressure seal chamber 25 seals the passageway so that the oxidizing gas and heat transfer particles 30 introduced into the furnace do not leak to the outside from the introduction hole 23 and the outlet hole 24. The configuration includes 26. In other words, by supplying pressurized gas into the pressure seal chamber 25, the pressure seal chamber 25
The atmospheric pressure inside the furnace 5 is set to be slightly higher than the atmospheric pressure inside the furnace 20 to prevent the oxidizing gas and the heat transfer particles 30 from leaking to the outside.
なお、このシール機構としては、他のシール機構を用い
てもよく、例えば、炉２０内へ向かって気体流を生じさ
せるエジェクターであってもよいし、場合によってはシ
ールせずに、路孔２３．２４から流出した熱媒粒子３０
を溜めてスクリューフィーダなどの返送手段で自動的に
炉２０内に戻すような機構とすることも可能である。Note that another sealing mechanism may be used as this sealing mechanism, for example, an ejector that generates a gas flow toward the inside of the furnace 20 may be used, or in some cases, the passage hole 23 may be sealed without sealing. Heat transfer particles 30 flowing out from .24
It is also possible to adopt a mechanism in which the gas is stored and automatically returned to the furnace 20 by a return means such as a screw feeder.
耐炎化処理炉２０の内部は、多孔性の分散板２８によっ
て、上下２室に分割されており、分散板２８の下方がガ
ス分散室２９、上方が熱媒粒子３０を充填した熱媒層４
（流動層４）となっている。The inside of the flame retardant treatment furnace 20 is divided into two upper and lower chambers by a porous dispersion plate 28, with a gas dispersion chamber 29 below the dispersion plate 28 and a heat medium layer 4 filled with heat medium particles 30 above the dispersion plate 28.
(Fluidized bed 4).
ガス分散室２９は、炉２０の底面部に連設されている給
気管２］と連通しており、給気管２１から導入された高
温の酸化性気体を均一に分散さセる室である。The gas distribution chamber 29 communicates with the air supply pipe 2 connected to the bottom of the furnace 20, and is a chamber in which the high temperature oxidizing gas introduced from the air supply pipe 21 is uniformly dispersed.
流動層４は、固体の熱媒粒子３０を気体で流動化した状
態で加熱処理する手段であって、分散板２８を通過した
酸化性気体で流動化され、かつ、所定温度つまり２００
°Ｃ以上５５０ ’Ｃ以下、好ましくは２４０′Ｃ以上
３５０ ”Ｃ以下に加熱された状態をいう。また、酸化
性気体は、空気の他、含硫黄気体など、前駆体繊維Ｔに
対して加熱時に広義の酸化反応を生じる気体を含んでい
る。The fluidized bed 4 is a means for heating the solid heating medium particles 30 in a state in which they are fluidized with a gas.
It refers to a state in which the precursor fiber T is heated to 550'C or higher, preferably 240'C or higher and 350'C or lower.In addition to air, the oxidizing gas may be a sulfur-containing gas or the like that is heated to the precursor fiber T. Contains gases that sometimes cause oxidation reactions in a broad sense.
熱媒粒子３０としては、前記流動層４の加熱温度に耐え
得る耐熱性を有する、例えば、主成分として炭素、アル
ミナ、炭化ケイ素、ジルコニア、シリカなどが単独ある
いは共存して構成されるセラミックやガラスなどの無機
物粒子を用いることができる。The heat transfer particles 30 are made of ceramic or glass that has heat resistance that can withstand the heating temperature of the fluidized bed 4, and is composed mainly of carbon, alumina, silicon carbide, zirconia, silica, etc., singly or in combination. Inorganic particles such as can be used.
また、粒径としては、ＪＩＳ Ｚ ８８０１、に定めら
れた標準ふるいを用い、ＪＩＳ Ｚ ８８１５、による
ふるい分は試験方式で、重量の８０％以上が１０メツシ
ユ（タイラー式）以下、好ましくは２８メツシユ以下の
小径の粒子が良い。粒径がこれ以上大き過ぎると、流動
化に必要な気体流量を多量に要し、粒子が前駆体繊維Ｔ
へ衝突する際の運動エネルギーが大きくなるため毛羽等
の物理的損傷を生じ易い。Regarding the particle size, use a standard sieve specified in JIS Z 8801, and the sieve portion according to JIS Z 8815 is a test method in which 80% or more of the weight is 10 meshes (Tyler type) or less, preferably 28 meshes. Particles with the following small diameters are preferable. If the particle size is too large, a large amount of gas flow is required for fluidization, and the particles become
Since the kinetic energy when colliding with the object increases, physical damage such as fuzz is likely to occur.
逆に粒径が小さいと、流動化に必要な気体流量も減少す
るし、前駆体繊維Ｔへの損傷も低減できる。Conversely, if the particle size is small, the gas flow rate required for fluidization will also be reduced, and damage to the precursor fibers T can also be reduced.
粒子の形状としては、特に限定しないがシャープエツジ
の無い球形状に近い粒子の方が前駆体繊維Ｔへの物理的
損傷が少ないため好ましい。Although the shape of the particles is not particularly limited, particles close to spherical shapes without sharp edges are preferable because they cause less physical damage to the precursor fibers T.
以上のような構成の流動層４に対して、折り返しローラ
１２ａ〜１２ｃ、１３ａ〜１３Ｃにより、複数段に折り
返されて通糸される前駆体繊維Ｔの２つの糸道間に形成
される間隙に多孔体３１．３１が取り付けられている。In the fluidized bed 4 having the above-described structure, the folding rollers 12a to 12c, 13a to 13C fill the gap formed between the two yarn paths of the precursor fiber T that is folded in multiple stages and threaded. A porous body 31.31 is attached.
この取りつけ数量には特にこだわることなく、例えば、
全ての段間（間隙）に取りつけてもよいし、場合によっ
ては、ある段間（間隙）に１枚だけ取りつけてもよい。For example, without being particular about the installation quantity,
It may be attached to all the gaps (gap), or in some cases, only one plate may be attached to a certain gap (gap).
多孔体３１は、流動層４内で発生した酸化性気体の気泡
を分割して、その成長を阻害するためのもので、気泡を
分割させる適当な口開きを有し、かつ、熱媒粒子３０が
通過する多孔体、例えば、ステンレス金網や、多孔板な
どで構成される。The porous body 31 is for dividing the bubbles of oxidizing gas generated in the fluidized bed 4 and inhibiting their growth. It consists of a porous body through which the air passes, such as a stainless wire mesh or a perforated plate.
この酸化性気体の分割効果を、熱媒粒子径と多孔体３１
の口開きとの関係で示したのが第５図である。The splitting effect of this oxidizing gas is determined by the heating medium particle diameter and the porous body 31.
FIG. 5 shows the relationship with the opening of the mouth.
第５図は横軸に材質が黒鉛の熱媒粒子３０の直径を示し
、縦軸に多孔体３１としてステンレス金網を用いた場合
の口開きを示し、前記熱媒粒子３０に酸化性気体として
５〜８Ｎｃｍ／ｓの流速の空気を吹き付けた場合の気泡
分割効果を示したもので、図中Ａは、気泡分割効果なし
の領域、Ｂは、気泡分割効果有りの領域、Ｃは熱媒粒子
３０のステンレス金網に対する通過阻害領域を示してい
る。In FIG. 5, the horizontal axis shows the diameter of the heating medium particles 30 made of graphite, and the vertical axis shows the opening when stainless wire mesh is used as the porous body 31. This figure shows the bubble splitting effect when air is blown at a flow rate of ~8 Ncm/s. In the figure, A is a region without a bubble splitting effect, B is a region with a bubble splitting effect, and C is a region with a heat transfer particle 30. It shows the passage obstruction area for the stainless steel wire mesh.
図中でＡ領域の気泡分割効果がないのは、ステンレス金
網の口開きが大きいため、気泡が細分化されないからで
あり、一方、Ｃ領域で熱媒粒子３０の流動化が阻害され
るのは、ステンレス金網の口開きが小さいため、気泡は
細分化されるが、熱媒粒子３０の通過を妨げるからであ
る。In the figure, the reason why there is no bubble splitting effect in area A is because the opening of the stainless wire mesh is large, so the bubbles are not divided into small pieces. This is because the opening of the stainless wire mesh is small, so that the air bubbles are fragmented, but this prevents the heat transfer particles 30 from passing through.
したがって、気泡分割効果の良い領域はハツチングで示
したＢＳＪｆ域であり、このＢ領域内でも、熱媒粒子径
を０．３ｍｍとし、ステンレス金網の口開きを０．６〜
１．０ ｍｍ （２８〜１６メツシユ）とするのがより
好ましい。Therefore, the region where the bubble splitting effect is good is the BSJf region shown by hatching, and even within this B region, the heating medium particle diameter is set to 0.3 mm, and the opening of the stainless steel wire mesh is set to 0.6 to 0.6 mm.
More preferably, it is 1.0 mm (28 to 16 meshes).
多孔体３１の取り付は位置としては、上方に位置する前
駆体繊維Ｔとの間隙高さをＨとすると、１０胴≦Ｈ≦３
０ｍｍの範囲に取りつけるのが好ましい。The mounting position of the porous body 31 is 10 cylinders≦H≦3, where H is the height of the gap with the precursor fiber T located above.
It is preferable to attach it within a range of 0 mm.
Ｈが１０ｗ以上になると、多孔体３１と前駆体繊維Ｔと
が接触する虞れがないから、前駆体繊維Ｔに損傷を与え
ない。一方、■が３０舶以下になると、多孔体３１で分
割された気泡が前駆体繊維Ｔに向かうまでに、再び合体
せずに細粒化したままであるから、前駆体繊維Ｔに毛羽
等の損傷を与える虞がない。When H is 10 W or more, there is no possibility that the porous body 31 and the precursor fibers T will come into contact with each other, so that the precursor fibers T will not be damaged. On the other hand, when ■ is less than 30, the air bubbles divided by the porous body 31 do not coalesce again and remain fine particles by the time they head toward the precursor fiber T. There is no risk of damage.
また、多孔体３１の取り付は方法は、第２図に示すよう
に、炉２０の内壁部の水平方向に沿ってガイドレール３
２を配置し、このガイドレール３２に対して摺動可能で
あるとともに、多孔体３１の辺縁部分を載置するステー
３３を設けて取り付けるのが好ましい例である。このよ
うな取り付は方法を適用することで、多孔体３１をステ
ー３３ごとガイドレール３２から引き出すことができ、
定期点検時の清掃などにおける分解・組立が容易になる
。The porous body 31 is attached to the guide rail 3 along the horizontal direction of the inner wall of the furnace 20, as shown in FIG.
In a preferred example, the porous body 31 is provided with a stay 33 which is slidable on the guide rail 32 and on which the edge portion of the porous body 31 is placed. By applying such a mounting method, the porous body 31 can be pulled out from the guide rail 32 along with the stay 33,
Easier disassembly and assembly for cleaning during periodic inspections, etc.
次に、上述した耐炎化処理炉２０の作用について説明す
る。Next, the operation of the above-mentioned flameproofing treatment furnace 20 will be explained.
給気管２１を通る酸化性気体は、ヒータ２７により、所
要温度に加熱され、ガス分散室２９内で均一に分散され
た後、分散板２８を通って熱媒層４内に侵入し、熱媒層
４を流動化して流動Ｎ４とする。このとき、流動層４内
に酸化性気体の気泡が発生し、徐々に成長しながら、流
動層４の表面に向かうが、前駆体繊維Ｔの折り返し段、
Ｔ２とＴ３との間、およびＴ４と１５との間に取りつり
られている多孔体３１に衝突して破裂し、微小な気泡と
なる。したがって、気泡が前駆体繊維Ｔと衝突して破裂
する際のショックも小さいものとなり、そのショックＧ
こまって前駆体繊維Ｔに毛羽等の物理的損傷を与えるこ
とがない。The oxidizing gas passing through the air supply pipe 21 is heated to a required temperature by the heater 27 and is uniformly dispersed in the gas distribution chamber 29, and then enters the heat medium layer 4 through the dispersion plate 28, and is heated to a desired temperature by the heater 27. Bed 4 is fluidized to form flow N4. At this time, bubbles of oxidizing gas are generated in the fluidized bed 4 and gradually grow toward the surface of the fluidized bed 4, but the folding stages of the precursor fibers T,
It collides with the porous body 31 suspended between T2 and T3 and between T4 and 15 and ruptures, forming minute bubbles. Therefore, the shock when the bubble collides with the precursor fiber T and ruptures is also small, and the shock G
Physical damage such as fuzz is not caused to the precursor fiber T.
〈発明の効果〉
以−Ｌの説明から明らかなように、本発明の耐炎化処理
炉によれば、流動層内に対して多段に折り返し、通糸さ
れた前駆体繊維の各糸道間の、少なくとも１つの間隙に
多孔体を取り（ｑけた構成としているので、流動層内に
発生した酸化性気体の気泡を、その多孔体によって分割
し、微小化することができる。したがって、前駆体繊維
に衝突して破裂する気泡のショックを和らげることがで
き、前駆体繊維に対して毛羽等の物理的損傷を与えるこ
となく、耐炎化処理速度を速め、耐炎化繊維の生産性を
向上することができる。<Effects of the Invention> As is clear from the explanation in L below, according to the flame-retardant treatment furnace of the present invention, the fibers are folded back in multiple stages in the fluidized bed, and the threads between each thread path of the threaded precursor fibers are folded in multiple stages. Since a porous body is provided in at least one gap (it has a q-order structure, the bubbles of oxidizing gas generated in the fluidized bed can be divided and miniaturized by the porous body. Therefore, the precursor fiber The shock of bubbles bursting when they collide with the fibers can be alleviated, speeding up the flame-retardant treatment speed and improving the productivity of flame-retardant fibers without causing physical damage such as fuzz to the precursor fibers. can.
第１図ないし第４図は本発明の第１実施例に係り、第１
図は耐炎化処理炉の縦断面図、第２図は多孔体の取り付
は例を示した断面図、第３図は耐炎化処理炉の概略構成
を示した図、第４図は折り返しローラの斜視図、第５図
は酸化性気体の気泡分割効果を熱媒粒子径と金網口開き
の関係で示した図である。
また、第６図は従来の耐炎化処理炉の縦断面図である。
４・・・流動層
１３ａ、 １３ｂ、 １３ｃ）
２０・・・耐炎化処理炉
３０・・・熱媒粒子 ３１・・・多孔体出願人 東
し 株 式 会 社代理人 弁理士 杉 谷
勉FIGS. 1 to 4 relate to a first embodiment of the present invention.
The figure is a longitudinal cross-sectional view of a flame-retardant treatment furnace, Figure 2 is a cross-sectional view showing an example of the installation of a porous body, Figure 3 is a diagram showing the schematic configuration of a flame-retardant treatment furnace, and Figure 4 is a folded roller. FIG. 5 is a perspective view showing the bubble splitting effect of oxidizing gas in terms of the relationship between the heating medium particle diameter and the opening of the wire mesh. Moreover, FIG. 6 is a longitudinal cross-sectional view of a conventional flame-retardant treatment furnace. 4...Fluidized bed 13a, 13b, 13c) 20...Flameproofing treatment furnace 30...Heating medium particles 31...Porous body applicant Higashi
Tsutomu Sugitani, stock company agent and patent attorney
Claims (1)
入して流動層とし、この流動層内に前駆体繊維を通糸し
て耐炎化処理を施す耐炎化処理炉において、 前記流動層外であって、かつ、炉軸方向の両端側に、前
駆体繊維を折り返して通糸する複数個の折り返しローラ
を備えるとともに、 前記流動層内であって、かつ、前記複数個の折り返しロ
ーラで折り返された前駆体繊維の糸道間の、少なくとも
１つの間隙に多孔体を取り付けたことを特徴とする耐炎
化処理炉。(1) In a flame-retardant treatment furnace in which a heated oxidizing gas is introduced into a deposited layer of heat transfer particles to form a fluidized bed, and a precursor fiber is threaded through the fluidized bed to perform a flame-retardant treatment, A plurality of folding rollers for folding back and threading the precursor fibers are provided outside the fluidized bed and at both ends in the furnace axis direction, and a plurality of folding rollers are provided inside the fluidized bed and the plurality of folding rollers are provided inside the fluidized bed and at both ends in the furnace axis direction. A flame-retardant treatment furnace characterized in that a porous body is attached to at least one gap between yarn paths of precursor fibers folded back by rollers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28295990A JPH04163322A (en) | 1990-10-19 | 1990-10-19 | Furnace for flame-resisting treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28295990A JPH04163322A (en) | 1990-10-19 | 1990-10-19 | Furnace for flame-resisting treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04163322A true JPH04163322A (en) | 1992-06-08 |
Family
ID=17659344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28295990A Pending JPH04163322A (en) | 1990-10-19 | 1990-10-19 | Furnace for flame-resisting treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04163322A (en) |
-
1990
- 1990-10-19 JP JP28295990A patent/JPH04163322A/en active Pending
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