JP2567140B2 - Bright annealing furnace - Google Patents
Bright annealing furnaceInfo
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- JP2567140B2 JP2567140B2 JP2232530A JP23253090A JP2567140B2 JP 2567140 B2 JP2567140 B2 JP 2567140B2 JP 2232530 A JP2232530 A JP 2232530A JP 23253090 A JP23253090 A JP 23253090A JP 2567140 B2 JP2567140 B2 JP 2567140B2
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- Prior art keywords
- furnace
- gas
- ventilation
- heating zone
- wall
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光輝焼鈍炉に関し、とくに新設炉の操業開
始時および補修後の再開時における立上げ所要時間（シ
ーズニング時間）の大幅な短縮を可能ならしめた縦型お
よび横型の連続光輝焼鈍炉である。Description: TECHNICAL FIELD The present invention relates to a bright annealing furnace, and in particular, to a great reduction in the start-up time (seasoning time) at the start of operation of a new furnace and restart after repair. Vertical and horizontal continuous bright annealing furnaces, if possible.
鉄，ニッケル，クロム，コバルト，アルミニウム，チ
タン，銅，亜鉛および錫ならびにそれらの合金薄帯の製
造に際しては、冷間圧延後の表面性状を保持したまま材
質の改善を図る目的で、いわゆる光輝焼鈍が施される。In the production of iron, nickel, chromium, cobalt, aluminum, titanium, copper, zinc and tin and their alloy ribbons, so-called bright annealing is carried out for the purpose of improving the material properties while maintaining the surface properties after cold rolling. Is applied.
かような光輝焼鈍に際しては、焼鈍中に酸化が生じな
いように、炉内を還元性雰囲気に保持しておくことが重
要である。炉内が完全に還元性の雰囲気になっているか
どうかは、通常、炉内ガスの水蒸気の露点を測定するこ
とによって知ることができる。In such bright annealing, it is important to maintain the inside of the furnace in a reducing atmosphere so that oxidation does not occur during annealing. Whether or not the furnace is in a completely reducing atmosphere can usually be known by measuring the dew point of water vapor in the furnace gas.
ところで、例えばステンレス鋼の光輝焼鈍は、800〜1
200℃程度の高温で行う必要があることから、焼鈍炉、
例えば直火型の焼鈍炉としては、炉内壁を耐火物で内張
りするとともに、炉外壁を鉄皮で覆って炉内を気密に保
持した構造になる炉が用いられる。このような構造にか
かる炉は、炉内に導入した薄帯を、同じく炉内に設置し
た電熱ヒータやラジアントチューブなどの発熱体および
耐火れんがからの輻射熱によって加熱するしくみになっ
ている。By the way, for example, bright annealing of stainless steel is 800-1
Since it needs to be performed at a high temperature of about 200 ° C, an annealing furnace,
For example, as a direct fire type annealing furnace, a furnace having a structure in which the inner wall of the furnace is lined with a refractory and the outer wall of the furnace is covered with a steel skin to keep the inside of the furnace airtight is used. In the furnace having such a structure, the ribbon introduced into the furnace is heated by radiant heat from a heating element such as an electric heater or a radiant tube and a refractory brick, which are also installed in the furnace.
しかしながら、このような構造の焼鈍炉では、炉を新
設した場合、および補修のために炉を一旦開放して大気
にさらした場合に、大気中の水分及び酸素，炭酸ガス等
が耐火れんが内に浸入する。そのために、焼鈍処理開始
または再開後に、炉内を還元性雰囲気とするまでに長時
間が必要であった。However, in the annealing furnace having such a structure, when the furnace is newly installed or when the furnace is once opened for repair and exposed to the atmosphere, moisture, oxygen, carbon dioxide gas, etc. in the atmosphere are contained in the refractory brick. Infiltrate. Therefore, it takes a long time to establish a reducing atmosphere in the furnace after starting or restarting the annealing treatment.
すなわち、炉内のれんが内部に水分等が浸入している
場合、直ちに高温になる炉内壁側は比較的早い時期に脱
水及び脱気が起る。しかしながら、炉壁の中間層から鉄
皮側（外層部）に位置するものは、温度勾配の関係から
結晶水の分解温度に近い部分では不安定で、沸点や結晶
水の分解温度に到達せず、脱水に長時間を要し、そのた
めに長時間、炉内を還元性雰囲気にできなかったのであ
る。That is, when moisture or the like has penetrated into the brick in the furnace, dehydration and deaeration occur at a relatively early stage on the furnace inner wall side where the temperature immediately becomes high. However, those located on the iron skin side (outer layer) from the middle layer of the furnace wall are unstable at the part close to the decomposition temperature of crystal water due to the temperature gradient, and the boiling point and the decomposition temperature of crystal water cannot be reached. However, it took a long time to dehydrate, which made it impossible to create a reducing atmosphere in the furnace for a long time.
そこでもし、充分な脱水を行わず、充分な還元性雰囲
気にならないままに炉操業を実施した場合、耐火れんが
内の残留水分が徐々に炉内に出てくるので露点が下がら
ず、従って、例えばステンレス鋼のような反応性に富む
金属（Cr,Mn,Alなど）含む薄帯を焼鈍しようとしても、
所期した光輝焼鈍ができない。結局、従来は満足いく低
露点での光輝焼鈍を行うには、１ケ月から２ケ月の長時
間のシーズニングを余儀なくされていたのである。Therefore, if the furnace operation is performed without sufficient dehydration and without a sufficient reducing atmosphere, the residual moisture in the refractory bricks gradually comes out into the furnace, so the dew point does not decrease, and therefore, for example, Even if you try to anneal a ribbon containing highly reactive metals (Cr, Mn, Al, etc.) such as stainless steel,
The desired bright annealing cannot be performed. After all, in order to perform bright annealing at a satisfactory low dew point, long-term seasoning from one month to two months has been conventionally required.
ところで、上記の問題を解決するものとして、従来、
第５図に示したような、マッフル24と呼ばれる耐熱鋼製
の円筒を炉内に装入し、このマッフル24内を清浄ガス
（還元性ガス）で充填して、発熱体からの輻射熱はマッ
フル24を介して薄帯に伝達する間接加熱方式の炉が提案
された。By the way, as a solution to the above problems,
As shown in Fig. 5, a cylinder made of heat-resistant steel called muffle 24 is charged into the furnace, and the inside of the muffle 24 is filled with clean gas (reducing gas) so that the radiant heat from the heating element is muffled. An indirect heating type furnace was proposed, which transfers to the ribbon via 24.
このような構造の焼鈍炉は、炉操業の開始および再開
時であっても、マッフル24内の雰囲気ガスを完全に置換
すれば、露点を容易に低下させることはできるけれど
も、 ｉ）マッフルとして高価な耐熱鋼を必要とする、 ii）マッフルが熱による変形を起こしやすく、寿命が短
いため、定期的な修理または取り替えが頻繁に必要とな
る、 iii）間接加熱方式であるため、熱効率が悪く、同一能
力では炉長が長くなる、 などの欠点があるため、小型炉ではともかく、大型炉で
は実際の使用に供することはできなかった。The annealing furnace having such a structure can easily lower the dew point by completely replacing the atmosphere gas in the muffle 24 even at the time of starting and restarting the furnace operation, but i) it is expensive as a muffle. Ii) The muffle is liable to be deformed by heat and its life is short, so frequent repairs or replacements are required frequently. Iii) Indirect heating method results in poor thermal efficiency. Due to the drawbacks such as longer reactor length with the same capacity, it was not possible to put it to practical use in large reactors, even in small reactors.
そこで、本発明者は、上述のような従来技術が抱える
問題点，すなわち、新設時および再開時における炉内雰
囲気調整と立上げの時間がかかりすぎることや、さらに
は大型炉への適用が困難なことなどが解消できる連続光
輝焼鈍炉の開発を目指して鋭意研究を行った。Therefore, the present inventor has a problem with the above-described conventional technique, that is, it takes too much time to adjust the atmosphere in the furnace at the time of new installation and restart, and it is difficult to apply it to a large-scale furnace. We have conducted intensive research aiming at the development of a continuous bright annealing furnace that can solve such problems.
その結果、炉内が早期に還元性雰囲気にならない原因
は、鉄皮近くの低温耐火れんが部に滞留した水分や酸素
が、長時間にわたって炉内に浸出してくることにあるこ
とが判った。従って、かような水分や酸素を、早期に、
積極的に炉外に排出し、正常な雰囲気ガスと置換するこ
とができれば、新設時および再開時における炉内雰囲気
（還元性雰囲気）の早期の実現が果たせるわけである。As a result, it was found that the reason why the reducing atmosphere in the furnace does not become an early stage is that the water and oxygen retained in the low temperature refractory bricks near the iron skin leached into the furnace for a long time. Therefore, such moisture and oxygen should be removed at an early stage.
If the gas can be positively discharged to the outside of the furnace and replaced with a normal atmosphere gas, the atmosphere in the furnace (reducing atmosphere) at the time of new installation and restart can be realized at an early stage.
本発明者は、上記の観点に立脚して数多くの実験と検
討を加えた末に、先に特願平２−115740号として、かよ
うな要請に応えられる新規な光輝焼鈍炉を開発した。The present inventor has made a number of experiments and studies based on the above viewpoints, and previously developed a novel bright annealing furnace as Japanese Patent Application No. 2-115740, which can meet such a request.
この焼鈍炉の構成の特徴は、炉壁の内張り耐火物中
に、通気用条孔を複数列設けると共に、この通気用条孔
内に、周面に多数の吸引口を開口した吸引パイプを配設
し、炉内で生成するガス（内張り中に滞留する不純ガ
ス）をこの吸引パイプを通じて炉外に積極的に排出する
ようにしたことにある。そして、吸引した炉内（雰囲
気）ガス中の不純物を除去したのちの清浄化（還元性）
ガスは、循環装置を介して再び、炉内に炉内ガスとして
供給するようにした光輝焼鈍炉を提案した。The features of this annealing furnace are that a plurality of rows of ventilation holes are provided in the refractory lining the furnace wall, and a suction pipe with a large number of suction ports on the peripheral surface is arranged in the ventilation holes. The gas generated in the furnace (impure gas staying in the lining) is actively discharged to the outside of the furnace through this suction pipe. Then, cleaning (reducing) after removing impurities in the sucked furnace (atmosphere) gas
A bright annealing furnace was proposed in which the gas was supplied to the furnace as a furnace gas again via a circulation device.
ところが、上記提案にかかる光輝焼鈍炉は、炉内ガス
吸引能力の面でなお改善すべき点が残されており、ま
た、吸引パイプを耐火物中に埋設するとはいえ、どちら
かというと炉内に近いために保護に欠けるという課題も
あった。However, the bright annealing furnace according to the above proposal still has a point to be improved in terms of the gas suction capacity in the furnace, and although the suction pipe is buried in the refractory, it is rather rather in the furnace. There was also a problem that it lacked protection because it was close to.
そこで、本発明では、先行提案にかかる前記光輝焼鈍
炉の機能をより一層向上させることを目的として以下に
述べるような光輝焼鈍炉を開発した。Therefore, the present invention has developed a bright annealing furnace as described below for the purpose of further improving the function of the bright annealing furnace according to the prior proposal.
上掲の目的に適合する新規な光輝焼鈍炉として、本発
明は、 外壁鉄皮の内側に、耐火物の内張りを設けて構成され
る炉壁を有し、内部が主として加熱帯とそれの下流側に
連設された冷却帯とからなる気密式の炉であって、前記
加熱帯から連続的に導入される金属薄帯を、還元性雰囲
気にて直接的に加熱し引続き冷却する形式の焼鈍炉にお
いて、 前記炉壁の内張り耐火物と外壁鉄皮との境界部に、条
孔状の通気間隙を複数列に亘って設け、これらの通気間
隙内には、周面の鉄皮側に向けて多数の通気口を開口さ
せてなる通気パイプを配設すると共に、この通気パイプ
を前記鉄皮の内面に係止し、この通気パイプを通じて炉
内のガスを炉外に排出するようにしてなり、かつ本発明
は加熱帯の入側近傍および冷却帯の出側近傍に炉内ガス
排出口を設けて炉内ガスの一部を炉外に排出するととも
に、炉外には吸引排出したその炉内ガス中の不純物成分
を除去して清浄化したのち、炉の冷却帯内に再供給する
炉内ガスの循環装置を付帯して設けたものを提案する。As a novel bright annealing furnace adapted to the above-mentioned purpose, the present invention has a furnace wall constituted by providing a refractory lining inside an outer wall iron shell, and the inside is mainly a heating zone and its downstream side. An airtight furnace consisting of a cooling zone continuously provided on the side, in which a thin metal strip continuously introduced from the heating zone is directly heated in a reducing atmosphere and subsequently cooled. In the furnace, at the boundary portion between the refractory lining of the furnace wall and the outer wall iron skin, striation-like ventilation gaps are provided in a plurality of rows, and in these ventilation gaps, the peripheral surface faces the iron skin side. A ventilation pipe with a large number of ventilation holes opened, and the ventilation pipe is locked to the inner surface of the iron shell so that the gas in the furnace is discharged to the outside of the furnace through the ventilation pipe. In addition, the present invention has a furnace gas outlet near the inlet side of the heating zone and near the outlet side of the cooling zone. At the same time, a part of the gas in the furnace is discharged to the outside of the furnace, and the impurity components in the gas in the furnace that has been sucked and discharged to the outside of the furnace are removed and cleaned, and then re-supplied in the cooling zone of the furnace. It is proposed that an internal gas circulation device is attached.
さて、新しく築炉する場合、れんがの接合に当っては
モルタルが使用される。ここに、炉内壁の高温部は、モ
ルタル内の結晶水が早い時期に分解するので容易に炉外
に放出されるけれども、炉外壁近傍ではなかなか分解温
度（通常350〜600℃）に到達せず、操業温度および時間
に応じて徐々に分解し、これが操業中少しづつ炉内に侵
入してくるために、炉内の露点は下がりにくかった。By the way, when newly building a furnace, mortar is used for joining bricks. In the high temperature part of the inner wall of the furnace, the crystal water in the mortar decomposes at an early stage, so it is easily released to the outside of the furnace, but it does not reach the decomposition temperature (usually 350 to 600 ° C) near the outer wall of the furnace. The dew point in the furnace was difficult to lower because it gradually decomposed according to the operating temperature and time, and gradually invaded into the furnace during operation.
また、長時間の処理によって完全に乾燥した炉であっ
ても、操業中、被処理材から微量ではあるが、マンガン
やボロンなどの揮発し易い金属成分が蒸気となって雰囲
気ガス中を拡散し、これが炉壁の凝結温度に近い所（主
に耐火れんがの目地や裏側）に晶出し付着する。従っ
て、保守のために炉を開放したとき、これらの金属成分
が大気中の水や酸素と反応して結晶水をもった金属酸化
物となり、しかもかかる金属酸化物の付着個所は比較的
低温部であるため、操業再開時に結晶水の分解に長時間
を要していた。Even in a furnace that has been completely dried by long-term treatment, during operation, the volatile metal components such as manganese and boron, which are trace amounts from the material to be treated, become vapor and diffuse in the atmosphere gas. , It crystallizes and adheres to the place near the condensation temperature of the furnace wall (mainly the joint and backside of the refractory brick). Therefore, when the furnace is opened for maintenance, these metal components react with water and oxygen in the atmosphere to form metal oxides with water of crystallization, and the places where such metal oxides adhere are relatively low temperature parts. Therefore, it took a long time to decompose the crystal water when the operation was restarted.
上記の解決策として、従来は第５図に示したような、
被処理材１と発熱部との間に耐熱鋼製のマッフル24を配
設した間接加熱方式の焼鈍炉が提案されたわけである
が、かような焼鈍炉には種々の問題が残されていること
は前述したとおりである。As a solution to the above, conventionally, as shown in FIG.
Although an indirect heating type annealing furnace in which a heat-resistant steel muffle 24 is disposed between the material 1 to be treated and the heat generating portion has been proposed, various problems remain in such an annealing furnace. This is as described above.
そこで本発明では、上記した直火方式焼鈍炉の問題を
解決するため、第３図（ａ）に示すように、炉内雰囲気
ガスの吸引排出のために、鉄皮と内張り耐火物との境界
部分に、炉内雰囲気ガス吸引のための通気用間隙，その
間隙内に配設する吸引口つき吸引パイプおよび排出口か
らなるガス排出構造を、炉体のとくに加熱帯を設けるこ
とにしたのである。かようなガス吸引排出構造、とくに
通気用の間隙，吸引パイプ内に流入した炉内雰囲気ガス
を、排出口を通じて、炉外に速やかに吸引排出するよう
にすれば、たとえ鉄皮近傍耐火物中の低温部で結晶水が
分解したとしても、発生した水分は前記ガス吸引排出構
造を通じて雰囲気ガスとともに炉外に排出できるので、
炉内に侵入して炉操業に悪影響を及ぼすことがなくなる
のである。Therefore, in the present invention, in order to solve the above-mentioned problems of the direct-fired annealing furnace, as shown in FIG. 3 (a), the boundary between the steel shell and the lining refractory material is sucked in for sucking and discharging the atmospheric gas in the furnace. A gas discharge structure consisting of a ventilation gap for sucking the atmosphere gas in the furnace, a suction pipe with a suction port arranged in the gap, and a discharge port is provided in the portion, especially in the heating zone of the furnace body. . If such a gas suction / exhaust structure, in particular, the furnace atmosphere gas that has flowed into the ventilation gap and the suction pipe is quickly sucked and discharged to the outside of the furnace through the discharge port, even if it is in the refractory near the steel Even if the crystal water is decomposed in the low temperature part of the, the generated water can be discharged to the outside of the furnace together with the atmospheric gas through the gas suction and discharge structure,
It will not enter the furnace and adversely affect the operation of the furnace.
このような構成にしたことによって本発明は、炉内で
生成したガスを吸引負荷の少ない状態で効率よく吸引排
出でき、そのために、上述した従来技術の欠点を有利に
解決することができる他、それによって炉内温度を均一
に分布させ得るという波及効果も生まれる。According to the present invention having such a configuration, the gas generated in the furnace can be efficiently sucked and discharged in a state where the suction load is small, and therefore, the above-described drawbacks of the conventional technique can be advantageously solved. This also has a ripple effect that the temperature inside the furnace can be evenly distributed.
〔実施例〕 以下、この発明の好適実施例を詳しく説明する。[Examples] Hereinafter, preferred examples of the present invention will be described in detail.
第１図は、本発明における縦型連続光輝焼鈍炉の好適
例を模式的に示すものである。図中の符号１は被処理材
である金属薄帯、２は加熱帯、３は冷却帯であって、こ
れらで連続光輝焼鈍炉を構成し、金属薄帯１は、炉入口
のシール部４を通って気密に保持された炉内に導入さ
れ、加熱帯２および冷却帯３を搬送される間に所定の熱
処理が施されたのち、炉出口シール部５から炉外に導出
されるしくみになっている。なお、６はガスクーラー、
７はブロワーである。FIG. 1 schematically shows a preferred example of the vertical continuous bright annealing furnace in the present invention. In the figure, reference numeral 1 is a metal ribbon as a material to be treated, 2 is a heating zone, 3 is a cooling zone, and these constitute a continuous bright annealing furnace. The metal ribbon 1 is a sealing portion 4 at the furnace inlet. Is introduced into the furnace that is kept airtight through the furnace, and is subjected to a predetermined heat treatment while being conveyed through the heating zone 2 and the cooling zone 3, and then is discharged from the furnace outlet seal section 5 to the outside of the furnace. Has become. In addition, 6 is a gas cooler,
7 is a blower.
第３図（ａ）は、加熱帯域における炉壁部の拡大図で
あり、同図のＢ−Ｂ矢視面を（ｂ）図として示す。図に
符号８として示すものは、電熱ヒータからなる発熱体で
って、給電部材９から通電し、投入電力量の加減によ
り、炉内の温度を調節するものである。10は電熱ヒータ
の支持金具である。そして、炉壁を構成している内張り
は、図示の符号11,12として示す耐火断熱れんがと、キ
ャスタブルを好適例とする保温材13からなり、外壁は鉄
皮14で構成されている。FIG. 3 (a) is an enlarged view of the furnace wall portion in the heating zone, and shows the BB arrow plane in FIG. 3 as a view (b). Reference numeral 8 in the drawing denotes a heating element composed of an electric heater, which is energized from the power feeding member 9 and adjusts the temperature in the furnace by adjusting the amount of input electric power. Reference numeral 10 is a support fitting for the electric heater. The lining forming the furnace wall is made up of refractory insulation bricks denoted by reference numerals 11 and 12 in the figure, and a heat insulating material 13 of which castable is a suitable example, and the outer wall is made of a steel skin 14.
本発明においては、第３図（ａ），（ｂ）に示すよう
に鉄皮14と前記内張り，とくに鉄皮14と耐火断熱れんが
12との間、すなわち、鉄皮14に接する保温材13を欠設す
ることによって得られる条孔状の通気間隙38を、特に横
型の例で言えば、炉殻の上部を中心として炉室を取り囲
むように複数列に亘って設けてあり、かつこの鉄皮14に
隣接して欠設された通気間隙38には、炉内ガス吸引のた
め、または還流ガスの炉内への吐出に用いる金属製の通
気パイプ39を遊挿配設する。In the present invention, as shown in FIGS. 3 (a) and 3 (b), the iron skin 14 and the inner lining, particularly the iron skin 14 and the fireproof heat insulating brick.
Between 12, i.e., the ventilation hole 38 in the shape of a hole obtained by lacking the heat insulating material 13 in contact with the iron skin 14, particularly in the case of a horizontal type, the furnace chamber is centered on the upper part of the furnace shell. The ventilation gap 38, which is provided in a plurality of rows so as to surround it and is provided adjacent to the iron shell 14, is provided with a metal used for sucking the gas in the furnace or discharging the reflux gas into the furnace. A ventilation pipe 39 made of aluminum is loosely inserted.
上記通気パイプ39を通気間隙38内の鉄皮14内面に沿っ
て固定する方法としては、第３図（ｄ）に示すように、
クリプバンド状の固定金具47を介して鉄皮14に直接取付
ける方法などが好適である。それは、通気パイプ39の温
度差による伸縮を吸収できる状態で取付けなければなら
ないからである。As a method of fixing the ventilation pipe 39 along the inner surface of the iron skin 14 in the ventilation gap 38, as shown in FIG.
A method of directly attaching to the steel skin 14 via a clip band-shaped fixing metal fitting 47 is preferable. This is because the ventilation pipe 39 must be mounted in a state where expansion and contraction due to the temperature difference can be absorbed.
さて、本発明においては、炉の加熱帯２の炉壁構造
を、上述のように、鉄皮14に接する部分に多数の通気間
隙38と通気パイプ39を列設したことにより、第１に、こ
の加熱帯域２の炉内雰囲気中で生成した反応ガスの吸引
排出ができるようになると共に、第２には、還流ガスを
再び炉内の冷却帯に供給させることができるようにな
る。また、このような構造とすることにより、炉内部を
気密に保持することができるようになると共に、熱を無
駄に炉外へ流出させるようなことがなくなる。Now, in the present invention, the furnace wall structure of the heating zone 2 of the furnace is, as described above, firstly provided with a large number of ventilation gaps 38 and ventilation pipes 39 in a line in contact with the iron shell 14, The reaction gas generated in the furnace atmosphere of the heating zone 2 can be sucked and discharged, and secondly, the reflux gas can be supplied again to the cooling zone in the furnace. Further, with such a structure, the inside of the furnace can be kept airtight, and heat can be prevented from being wastefully discharged to the outside of the furnace.
なお、前記通気パイプ39に設ける通気口39aは、パイ
プの周面の、とくに鉄皮14側に臨んで開口させることが
望ましく、そしてこれらは２列位に分けて開口している
ことが望ましく、このような構成によると、炉壁鉄皮の
内側に沿って流通する炉内ガスを効果的に吸引できる。In addition, it is desirable that the ventilation port 39a provided in the ventilation pipe 39 is opened so as to face the peripheral surface of the pipe, particularly, the iron skin 14 side, and these are divided into two rows. With such a configuration, the in-furnace gas flowing along the inside of the furnace wall iron skin can be effectively sucked.
第３図（ｃ）は、上記の炉壁構造において、炉内を12
00℃に加熱したときの炉壁の厚み方向の温度分布を示す
ものである。同図より明らかなように、炉壁の温度は鉄
皮14に近づくほど低くなっており、このことから、この
鉄皮14と内張り耐火物13との境界部分に前記通気パイプ
39を配設することの意義が判る。FIG. 3 (c) shows the inside of the furnace in the above furnace wall structure.
It shows the temperature distribution in the thickness direction of the furnace wall when heated to 00 ° C. As is clear from the figure, the temperature of the furnace wall becomes lower as it approaches the iron skin 14, and from this fact, the ventilation pipe is formed at the boundary between the iron skin 14 and the refractory lining 13.
The significance of arranging 39 is understood.
次に、本発明を縦形光輝焼鈍炉に適用した場合につい
て、第１図に基づき、それの雰囲気ガスの流れを説明す
る。Next, in the case where the present invention is applied to the vertical bright annealing furnace, the flow of the atmospheric gas will be described based on FIG.
新鮮な雰囲気ガスの供給系統は、冷却帯３に設けた
ガス供給口16より、炉の入側・出側の各シール部4,5か
らの漏洩分を補充し、炉内の圧力を大気圧よりも常に高
い状態を維持するように供給される。なお、冷却帯３で
は、炉内ガスを、ブロワーにてガスクーラー６を経由さ
せて吸引冷却し、加圧したのち、再び吹付けノズルを介
して炉内に冷風として戻している。本発明の光輝焼鈍炉
では、上記した新規ガス供給系統の他、内張り耐火物
中に配設した通気パイプ39を通じて、それの周面に設け
た多数の通気口39aから加熱炉内の雰囲気ガスを吸引す
る（ｂ）の系統および炉の入・出側部の雰囲気ガスを集
めて吸引するの系統からなる循環ガス系統が付加され
ている。The supply system of fresh atmosphere gas supplements the leakage from each of the inlet and outlet seal parts 4 and 5 of the furnace through the gas supply port 16 provided in the cooling zone 3 so that the pressure inside the furnace is atmospheric pressure. It is supplied so that it always maintains a higher state. In the cooling zone 3, the furnace gas is sucked and cooled by the blower via the gas cooler 6, pressurized, and then returned to the furnace as cold air again through the blowing nozzle. In the bright annealing furnace of the present invention, in addition to the above-mentioned new gas supply system, through the ventilation pipe 39 arranged in the refractory lining, the atmospheric gas in the heating furnace is supplied from the numerous ventilation holes 39a provided in the peripheral surface thereof. A circulation gas system including a system for sucking (b) and a system for collecting and sucking atmospheric gas at the inlet and outlet sides of the furnace is added.
まず、そのの循環ガス系統は、ブロワー17と、雰囲
気ガスの露点を計測する露点計18と、薄帯１に付着して
炉内に侵入して遊離酸素を雰囲気中の水素と反応させて
水に変換するデオキソ19と、雰囲気ガス中の水分や炭酸
ガスを吸着除去する脱水装置20で構成されており、この
循環ガス系統を経て清浄化された雰囲気ガスは、前記
系統のガスと共に、あるいは単独にガス供給口16より
炉内の冷却帯３中に吹込まれる。First, the circulating gas system is a blower 17, a dew point meter 18 for measuring the dew point of the atmospheric gas, and a thin strip 1 that adheres to the furnace 1 and enters the furnace to react free oxygen with hydrogen in the atmosphere to generate water. It is composed of a deoxo 19 that converts into degassing water and a dehydrator 20 that adsorbs and removes moisture and carbon dioxide gas in the atmospheric gas, and the atmospheric gas purified through this circulation gas system is either the gas of the system or a single gas. Is blown into the cooling zone 3 in the furnace from the gas supply port 16.
また、の循環ガス系統は、炉の入側・出側のシール
部近傍から吸引した雰囲気ガスを、露点計21にて露点計
測後、ブロワー22を経て、前記の循環ガス系統とデオ
キソ19の手前で合流させた循環ガス系統である。In addition, the circulating gas system of is the atmosphere gas sucked from the vicinity of the seal part on the inlet side and the outlet side of the furnace, after the dew point is measured by the dew point meter 21, and then through the blower 22, before the circulating gas system and the deoxo 19. It is a circulating gas system that is merged in.
なお、上述のガス排出構造は、炉の形式が縦型と横型
とでは若干の違いはあるが、第１図に示すような、加熱
帯３の全長に亘る長い通気パイプ39を炉壁に沿って平行
に配設する場合の他、第２図に示すように短い通気パイ
プ39を例えば千鳥状に配設し、それぞれのパイプからは
１〜複数個の排出口15につながる排出パイプ15aを接続
してもよい。いずれにしても、通気間隙38および通気パ
イプ39の配列は、炉体を取りかこむように設置する。ま
た、このようなガス排出構造は加熱帯のみならず、入口
側の部分に配設してもよい。Although there are some differences in the type of furnace between the vertical type and the horizontal type in the gas discharge structure described above, a long ventilation pipe 39 extending over the entire length of the heating zone 3 as shown in FIG. 1 is provided along the furnace wall. In addition to the case of arranging in parallel with each other, short ventilation pipes 39 are arranged in a zigzag manner as shown in FIG. 2, and discharge pipes 15a connected to one to a plurality of discharge ports 15 are connected from each pipe. You may. In any case, the arrangement of the ventilation gap 38 and the ventilation pipe 39 is installed so as to enclose the furnace body. Further, such a gas discharge structure may be arranged not only in the heating zone but also in the portion on the inlet side.
上述したように、本発明によれば、主として加熱帯２
の鉄皮14の内面沿いに設けた通気間隙38および通気パイ
プ39に流入する炉内雰囲気ガスを、循環ガス系統を通
じて吸引すると共に、炉の入側・出側の部分からも循環
ガスを通じて吸引し、吸引・排出したこれらの炉内雰
囲気ガスを炉内に還流させることにより、早期に正常な
炉内雰囲気にすることができるから、直火式連続光輝焼
鈍炉の操業開始および再開時における待機時間を大幅に
短縮することができる。As described above, according to the present invention, the heating zone 2 is mainly used.
The furnace atmosphere gas flowing into the ventilation gap 38 and the ventilation pipe 39 provided along the inner surface of the iron skin 14 is sucked through the circulating gas system and also through the circulating gas from the inlet and outlet sides of the furnace. By returning the sucked and exhausted atmosphere gas in the furnace to the normal atmosphere in the furnace early, the standby time at the start and restart of the direct-fired continuous bright annealing furnace Can be significantly shortened.
次に、本発明光輝焼鈍炉の実際の炉操業における各供
給系統の運転要領について説明する。Next, the operating procedure of each supply system in the actual furnace operation of the bright annealing furnace of the present invention will be described.
まず、新規ガス供給系統については、操業全期間に
わたり、炉内を所定圧力に保持するのに必要なガス量を
供給する。First, for the new gas supply system, the amount of gas required to maintain the inside of the furnace at a predetermined pressure is supplied over the entire operation period.
次に、循環ガス系統のうちのは、操業開始時または
再開時はフル運転し、露点計18を監視しながら、乾燥が
進むに従って吸引力を次第に弱めていき、乾燥が完全に
終了したならば、ブロワー17による吸引を停止すると同
時に、ストップバルブ23を閉止する。このように乾燥終
了後、系統を止める理由は、前述したように炉内の揮
発金属蒸気が耐火物に不必要に沈着することを回避する
ためである。Next, in the circulating gas system, when the operation is started or restarted, full operation is performed, while monitoring the dew point meter 18, the suction force is gradually weakened as the drying progresses, and if the drying is completely completed. , The suction by the blower 17 is stopped, and at the same time, the stop valve 23 is closed. The reason for stopping the system after the completion of drying is to avoid unnecessary deposition of volatile metal vapor in the furnace on the refractory material as described above.
なお、より有利な揮発金属蒸気の沈着防止策として
は、乾燥終了後は、脱水処理を終えた清浄ガスをストッ
プバルブ23を閉じ、26を開けて、ブロワー17を止め、炉
殻鉄皮に設けた排出口15および通気パイプ39を通じて、
炉内外の圧力差を利用して、逆に炉内に送り込んで還流
させることも可能である。As a more advantageous measure to prevent the deposition of volatile metal vapor, after the completion of drying, the clean gas that has been dehydrated is closed by closing the stop valve 23, opening 26, stopping the blower 17, and installing it in the furnace shell. Through the exhaust port 15 and the ventilation pipe 39,
By utilizing the pressure difference between the inside and outside of the furnace, it is also possible to send it back into the furnace for reflux.
また、循環ガス系統は、炉の出入口であって外気と
の接点である。したがって、常時微量の空気が侵入する
から、露点計21を監視しながら、所望の低露点を保持す
るために積極的に吸引し、常時低露点に維持するのに必
要である。Further, the circulating gas system is the entrance and exit of the furnace and is a contact point with the outside air. Therefore, since a small amount of air constantly enters, it is necessary to monitor the dew-point meter 21 and actively inhale to maintain a desired low dew point, and maintain the low dew point at all times.
なお、このケースにおいて、吸引した雰囲気ガスを清
浄化したり再利用しない場合には、吸引したガスをスト
ップバルブ25を開放する一方、の循環ガス系統内スト
ップバルブ23を閉止してそのまま放散ブリーダーから大
気中に放散しても良い。In this case, when the sucked atmospheric gas is not cleaned or reused, the sucked gas is opened to the stop valve 25 while the stop valve 23 in the circulating gas system is closed to directly release the atmospheric air from the emission breeder. You may dissipate inside.
第１図にもとづく以上の説明は、焼鈍炉の各部の構成
が縦型；すなわち加熱帯入口から冷却帯出口に至るまで
の薄板通板経路の各帯域配置が、縦配列にかかる例であ
るが、本発明としては、その他に、かかる各帯域の配列
を横並びに配列することも可能であり、この場合でも本
発明の作用・効果は特に変わるものではない。The above description based on FIG. 1 is an example in which the configuration of each part of the annealing furnace is vertical; that is, each band arrangement of the thin plate passing path from the heating zone inlet to the cooling zone outlet is in the vertical arrangement. In addition, according to the present invention, it is also possible to arrange the arrangement of each band side by side, and even in this case, the operation and effect of the present invention are not particularly changed.
すなわち、本発明の他の実施例について、第４図にそ
の構成を例示する。図において、水平に搬送される金属
薄帯１は、炉入口シール部41を経て、順次水平に配置さ
れている加熱帯42、徐冷帯43、冷却帯44を通過し、炉出
口シール部45に到達するが、その間薄帯１は第１図示例
の場合と異なり、一貫して水平に搬送されることにな
る。そのために、各帯域42,43,44には薄帯支持のための
支持ロール46を炉内搬送ラインに沿って複数個列設し、
通板材の垂れ下がりを防止するように構成する。なお、
図中に示す符号6,7,14,15〜23,25,26は、いずれも第１
図に示す焼鈍炉の構造と同じ構成を示し、それらは縦型
のものを単に横型配置に適合するようにアレンジされる
だけで十分である。That is, FIG. 4 illustrates the configuration of another embodiment of the present invention. In the figure, the metal ribbon 1 conveyed horizontally passes through a furnace inlet seal portion 41, a heating zone 42, a slow cooling zone 43, and a cooling zone 44 which are sequentially arranged horizontally, and a furnace outlet seal portion 45. However, unlike the case of the first illustrated example, the ribbon 1 is consistently conveyed horizontally during that time. Therefore, in each zone 42, 43, 44, a plurality of support rolls 46 for supporting thin strips are provided in a line along the in-furnace conveying line,
It is configured to prevent the plate material from hanging down. In addition,
Reference numerals 6, 7, 14, 15 to 23, 25, 26 shown in the figure are all the first
It shows the same construction as the structure of the annealing furnace shown, it being sufficient that the vertical ones are simply arranged to fit the horizontal arrangement.
〔発明の効果〕 かくしてこの発明によれば、直火式の利点である熱効
率を低下させることなしに、従来に比べて操業開始又は
再開までの待機時間を大幅に短縮することができ、工業
的に寄与するところ大である。しかも本発明によれば、
炉内雰囲気ガスの吸引，排出を、温度の最も低い鉄皮内
面沿いに設けた通気用間隙内に吸引パイプを設置して行
うので、吸引パイプの保護とともに、炉内ガスの吸引・
排出を円滑なものにすることができる。[Advantages of the Invention] Thus, according to the present invention, the standby time until the start of operation or the restart can be significantly shortened as compared with the conventional one, without lowering the thermal efficiency, which is an advantage of the direct fire system, It greatly contributes to. Moreover, according to the present invention,
Suction and exhaust of the furnace atmosphere gas are performed by installing a suction pipe in the ventilation gap provided along the inner surface of the iron shell with the lowest temperature.
The discharge can be smooth.
第１図は、縦型の例である本発明の連続光輝焼鈍炉の好
適例を示す模式図、 第２図は、通気パイプを分割したときの本発明の他の実
施例の縦型連続焼鈍炉を示す模式図、 第３図（ａ）は第１図Ａ部の拡大断面図、同図（ｂ）は
通気パイプ固定のもようを示すもので、（ａ）図のＢ−
Ｂ矢視方向から見た炉内部分正面図、同図（ｃ）は炉壁
厚み方向の温度分布図、同図（ｄ）は通気パイプ取付け
状態の部分断面図、および同図（ｅ）は（ａ）図のＸ−
Ｘ矢視部断面図、 第４図は、本発明の他実施例である横型連続光輝焼鈍炉
の好適例を示す模式図、 第５図は、加熱帯にマッフルを具える従来の縦型連続光
輝焼鈍炉の模式図である。 １……金属薄帯、２……加熱帯、３……冷却帯、４……
炉入口シール部、５……炉出口シール部、６……ガスク
ーラー、７……ブロワー、８……発熱体、９……給電部
材、10……支持金具、11……内張り耐火れんが、12……
断熱れんが、13……保温材、14……鉄皮、15……排出
口、15a……排出パイプ、16……ガス供給口、17,22……
ブロワー、18,21……露点計、19……デオキソ、20……
脱水装置、23,25,26……ストップバルブ、24……マッフ
ル、31……入口シール部、32……加熱帯、33……徐冷
帯、34……冷却帯、35……出口シール部、36,37……支
持ロール、38……通気間隙、39……通気パイプ、39a…
…通気口、41……炉入口シール部、42……加熱帯、43…
…徐冷帯、44……冷却帯、45……炉出口シール部、46…
…支持ロール、47……固定金具FIG. 1 is a schematic view showing a preferred example of a continuous bright annealing furnace of the present invention which is a vertical type, and FIG. 2 is a vertical continuous annealing of another embodiment of the present invention when a ventilation pipe is divided. Fig. 3 (a) is a schematic view showing the furnace, Fig. 3 (a) is an enlarged cross-sectional view of part A in Fig. 1, and Fig. 3 (b) is a view showing how the ventilation pipe is fixed.
A partial front view of the inside of the furnace seen from the direction of the arrow B, (c) is a temperature distribution diagram in the thickness direction of the furnace wall, (d) is a partial cross-sectional view of the ventilation pipe attached state, and (e) is (A) X- in the figure
FIG. 4 is a schematic view showing a preferred example of a horizontal continuous bright annealing furnace which is another embodiment of the present invention, and FIG. 5 is a conventional vertical continuous type having a heating zone with a muffle. It is a schematic diagram of a bright annealing furnace. 1 ... Metal ribbon, 2 ... Heating zone, 3 ... Cooling zone, 4 ...
Furnace inlet seal part, 5 …… Furnace exit seal part, 6 …… Gas cooler, 7 …… Blower, 8 …… Heating element, 9 …… Power supply member, 10 …… Supporting metal fitting, 11 …… Lined refractory brick, 12 ......
Insulation brick, 13 ... Insulating material, 14 ... Iron skin, 15 ... Discharge port, 15a ... Discharge pipe, 16 ... Gas supply port, 17, 22 ......
Blower, 18, 21 ... Dew point meter, 19 ... Deoxo, 20 ...
Dehydrator, 23,25,26 …… Stop valve, 24 …… Muffle, 31 …… Inlet seal section, 32 …… Heating zone, 33 …… Slow cooling zone, 34 …… Cooling zone, 35 …… Outlet seal section , 36, 37 …… Support roll, 38 …… Ventilation gap, 39 …… Ventilation pipe, 39a…
… Ventilation port, 41 …… Furnace inlet seal part, 42 …… Heating zone, 43…
… Annealing zone, 44 …… Cooling zone, 45 …… Furnace outlet seal part, 46…
… Support roll, 47 …… Fixing bracket
Claims (1)
構成される炉壁を有し、内部が主として加熱帯とそれの
下流側に連設された冷却帯とからなる気密式の炉であっ
て、前記加熱帯から連続的に導入される金属薄帯を還元
性雰囲気にて直接的に加熱し引続き冷却する形式の焼鈍
炉において、 前記炉壁の内張り耐火物と外壁鉄皮との境界部に、条孔
状の通気間隙を複数列に亘って設け、これらの通気間隙
内には周面の鉄皮側に向けて多数の通気口を開口させて
なる通気パイプを配設すると共に、この通気パイプを前
記鉄皮の内面に係止し、 前記通気パイプを通じて炉内のガスを炉外に排出するよ
うにしてなり、かつ加熱帯の入側近傍および冷却帯の出
側近傍に炉内ガス排出口を設けて炉内ガスの一部を炉外
に排出するとともに、炉外には吸引排出したその炉内ガ
ス中の不純物成分を除去して清浄化したのち炉の冷却帯
内に再供給する炉内ガスの循環装置を付帯して設けたこ
とを特徴とする光輝焼鈍炉。1. An airtight type furnace having a furnace wall constructed by providing a refractory lining on the inside of an outer wall iron shell, the interior of which is mainly composed of a heating zone and a cooling zone connected downstream of the heating zone. A furnace, in a type of annealing furnace in which a thin metal strip continuously introduced from the heating zone is directly heated in a reducing atmosphere and subsequently cooled, wherein a refractory lining the furnace wall and an outer wall iron shell A plurality of rows of striation-shaped ventilation gaps are provided at the boundaries of the ventilation gaps, and ventilation pipes are formed in these ventilation gaps by opening a large number of ventilation holes toward the iron skin side of the peripheral surface. Along with this, the ventilation pipe is locked to the inner surface of the iron shell, so that the gas in the furnace is discharged to the outside of the furnace through the ventilation pipe, and in the vicinity of the inlet side of the heating zone and the outlet side of the cooling zone. An in-furnace gas outlet is provided to discharge some of the in-furnace gas outside the furnace and Bright annealing furnace, characterized in that provided by supplementary circulation device discharge the impurity components were removed cleaned the resupply furnace gas in the cooling zone of the later reactors of the furnace gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2232530A JP2567140B2 (en) | 1990-09-04 | 1990-09-04 | Bright annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2232530A JP2567140B2 (en) | 1990-09-04 | 1990-09-04 | Bright annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04116127A JPH04116127A (en) | 1992-04-16 |
| JP2567140B2 true JP2567140B2 (en) | 1996-12-25 |
Family
ID=16940784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2232530A Expired - Fee Related JP2567140B2 (en) | 1990-09-04 | 1990-09-04 | Bright annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2567140B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012081719A1 (en) | 2010-12-17 | 2012-06-21 | Ｊｆｅスチール株式会社 | Method for continuously annealing steel strip and hot-dip galvanization method |
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| WO2013187042A1 (en) | 2012-06-13 | 2013-12-19 | Ｊｆｅスチール株式会社 | Method of continuous annealing of steel strip, and method of manufacturing hot-dip galvanized steel strip |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61253327A (en) * | 1985-04-30 | 1986-11-11 | Sumitomo Metal Ind Ltd | Method for decreasing dew point of heating furnace |
| JPS62177126A (en) * | 1986-01-31 | 1987-08-04 | Nisshin Steel Co Ltd | Method for continuously annealing strip |
-
1990
- 1990-09-04 JP JP2232530A patent/JP2567140B2/en not_active Expired - Fee Related
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