JPH02310323A - Direct-fired vertical continuous annealing furnace and operation thereof - Google Patents
Direct-fired vertical continuous annealing furnace and operation thereofInfo
- Publication number
- JPH02310323A JPH02310323A JP13107489A JP13107489A JPH02310323A JP H02310323 A JPH02310323 A JP H02310323A JP 13107489 A JP13107489 A JP 13107489A JP 13107489 A JP13107489 A JP 13107489A JP H02310323 A JPH02310323 A JP H02310323A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- direct
- intermediate chamber
- fired
- inert gas
- 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.)
- Granted
Links
- 238000000137 annealing Methods 0.000 title claims description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 75
- 239000011261 inert gas Substances 0.000 claims abstract description 52
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 230000007423 decrease Effects 0.000 claims abstract description 10
- 230000001590 oxidative effect Effects 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 10
- 230000002829 reductive effect Effects 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 8
- 238000011017 operating method Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 239000002912 waste gas Substances 0.000 description 5
- 230000001902 propagating effect Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、竪型直火炉と、それに続く無酸化雰囲気炉
を有する連続焼鈍炉とその操業方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous annealing furnace having a vertical direct-fired furnace and a non-oxidizing atmosphere furnace following it, and a method of operating the same.
［従来技術］
薄銅帯を連続焼鈍する設備の一つにシーラス式直火加熱
方式による設備がある。これは廃ガス等により２００〜
３００℃に予熱された銅帯を上から下へと竪方向に１パ
スさせる間に、銅帯の表裏面に向けて多数配置された直
火バーナにより焼鈍温度まで加熱するというものである
。この設備は未燃焼分の残った高温の燃焼生成ガス（１
２６０℃以上）を直接鋼帯に当てて無酸化還元加熱が可
能であるのが特徴である。[Prior Art] One type of equipment for continuously annealing thin copper strips is equipment using a Cirrus type direct flame heating method. This is 200~ due to waste gas etc.
While the copper strip preheated to 300° C. is passed vertically from top to bottom, it is heated to the annealing temperature using a large number of direct fire burners arranged on the front and back surfaces of the copper strip. This equipment uses high-temperature combustion generated gas (1
260°C or higher) is directly applied to the steel strip to perform non-oxidation-reduction heating.
最近、シーラス方式の連続焼鈍炉が、連続焼鈍ラインや
連続亜鉛メツキラインに好んで採用されるようになって
きたが、これは、設備が大型化するにともない、コンパ
クトな炉が望まれるようになってきたことや、非常に熱
応答性がよくて温度外れ部がすくないとか、銅帯を１パ
スで再結晶温度以上に加熱することができるために、銅
帯の形状が良好でトラッキング性が良いこと等によるも
のと思われる。Recently, Cirrus type continuous annealing furnaces have become preferred for continuous annealing lines and continuous galvanizing lines, but as equipment becomes larger, compact furnaces are desired. The copper strip has a good shape and good tracking performance because the copper strip can be heated above the recrystallization temperature in one pass. This seems to be due to the following reasons.
第３図は竪型直火加熱ｆを含む連続焼鈍炉の構成の一例
を示す縦断面図である。鋼帯３１は、予熱炉３２で直火
加熱炉３３の廃ガスにより、２００〜３００℃程度に予
熱され、その後直火加熱炉３３で５６０〜７６０℃に加
熱される。直火加熱炉３３で加熱された鋼帯３１は、そ
の後均熱炉３４、急冷炉３５及び徐冷炉３６からなる無
酸化雰囲気炉３７内で熱処理され、焼鈍工程を完了する
。無酸化雰囲気炉３７内の雰囲気は、予熱炉３２や直火
加熱炉３３とは異なり、特に後段では鋼帯３１が高温で
かつ雰囲気ガスの温度が低温である状態なので、雰囲気
の完全無酸化性を満たすために、一般的には酸素（０２
）％が数ｐｐｍ以下の窒素（Ｎ２）ガスと水素（Ｎ２）
ガスの混合気（水素ガスは５〜７５％）が用いら−れて
いる。FIG. 3 is a longitudinal sectional view showing an example of the configuration of a continuous annealing furnace including a vertical direct-fire heating f. The steel strip 31 is preheated to about 200 to 300°C in a preheating furnace 32 with waste gas from a direct heating furnace 33, and then heated to 560 to 760°C in a direct heating furnace 33. The steel strip 31 heated in the direct-fired heating furnace 33 is then heat-treated in a non-oxidizing atmosphere furnace 37 consisting of a soaking furnace 34, a rapid cooling furnace 35, and a slow cooling furnace 36 to complete the annealing process. The atmosphere in the non-oxidizing atmosphere furnace 37 is different from that in the preheating furnace 32 and the direct-fired heating furnace 33, in that the steel strip 31 is at a high temperature and the temperature of the atmospheric gas is low, especially in the latter stage, so that the atmosphere is completely non-oxidizing. Oxygen (02
)% of nitrogen (N2) gas and hydrogen (N2) of several ppm or less
A mixture of gases (5-75% hydrogen gas) is used.
第４図は、竪型直火加熱炉３３の概略構成を示す縦断面
図である。竪型直火加熱炉３３は、通常鋼帯３１の進行
方向に加熱ゾーンが複数の加熱ゾーン、この図の場合に
は第１ゾーン４１、第２ゾーン４２、第３ゾーン４３お
よび第４ゾーン４４の４ゾーン、に分割されている。そ
して、第１ゾーン４１においては、空燃比１．０程度で
燃焼させるが、燃焼ゾーンが進むにしたがって空燃比を
下げていき、最終ゾーンでは０．８５〜０．９５程度で
燃焼させるようにしている。FIG. 4 is a longitudinal sectional view showing a schematic configuration of the vertical direct-fired heating furnace 33. The vertical direct-fired heating furnace 33 usually has a plurality of heating zones in the advancing direction of the steel strip 31, in the case of this figure, a first zone 41, a second zone 42, a third zone 43, and a fourth zone 44. It is divided into four zones. In the first zone 41, combustion is performed at an air-fuel ratio of about 1.0, but as the combustion zone progresses, the air-fuel ratio is lowered, and in the final zone, combustion is performed at an air-fuel ratio of about 0.85 to 0.95. There is.
上記のような構成において、直火加熱炉３３の加熱の負
荷が変動する場合には、加熱の負荷に応じて加熱ゾーン
を増減するため、加熱ゾーンを０Ｎ−ＯＦＦしたり、各
加熱ゾーン内の燃焼量を変更したりしている。そして、
加熱ゾーンの点火は、通常第４ゾーン４４から始めて第
１ゾーン４１へと移行していくようにし、消火は第１ゾ
ーン４１から始めて第４ゾーンへと移行していくように
している。また、各加熱ゾーン内におけるバーナの燃焼
量は、１００％燃焼能力を発揮するフル燃焼から燃焼能
力の１０％程度しか発揮しない燃焼までのターンダウン
が可能であるが、燃焼機器全体の安定性の点からターン
ダウンの範囲を１００％から２０〜２５％とし、燃焼量
がそれ以下となる場合には、そのゾーンを消火するよう
にしている。In the above configuration, when the heating load of the direct-fired heating furnace 33 fluctuates, the number of heating zones is increased or decreased depending on the heating load, such as turning the heating zone ON-OFF or turning off the heating zone in each heating zone. The amount of combustion is changed. and,
Ignition in the heating zone usually starts from the fourth zone 44 and moves to the first zone 41, and extinguishing starts from the first zone 41 and moves to the fourth zone. In addition, the combustion amount of the burner in each heating zone can be turned down from full combustion, which produces 100% combustion capacity, to combustion, which produces only about 10% of its combustion capacity, but this may affect the stability of the entire combustion equipment. The turndown range is set from 100% to 20-25%, and if the combustion amount is less than that, the fire is extinguished in that zone.
上述したように、竪型直火加熱炉３３においては加熱負
荷の変動に応じて各加熱ゾーンのＯＮ。As described above, in the vertical direct-fired heating furnace 33, each heating zone is turned on according to fluctuations in heating load.
ＯＦＦを行なうので、竪型直火加熱炉３３内の廃ガスの
量が大きく変動することになる。一方竪型直火炉３３に
おいては、未燃焼分を含む高温（１２６０℃超え）の燃
焼生成ガスを直接鋼帯３１に衝突させて、還元加熱する
ようにしているので、バーナと銅帯間の距離が小さく、
したがって、炉容積も小さくなっており、前記廃ガス量
の変動とあいまって炉内圧力変動を大きくする要因とな
っている、なお、直火加熱炉３３内の圧力は通常廃ガス
煙道４５に設けた廃ガスダンパー（図示せず）により、
５〜１０ｍｍＨ２Ｏ程度にコントロールされているが、
バーナー０Ｎ−ＯＦＦ時の圧力変動は急激であり、応答
が遅いダンパーではこの急激な圧力変動を吸収すること
は困難である。Since it is turned off, the amount of waste gas in the vertical direct-fired heating furnace 33 will vary greatly. On the other hand, in the vertical direct-fired furnace 33, the high-temperature (over 1260°C) combustion generated gas containing unburned material directly collides with the steel strip 31 to perform reductive heating, so the distance between the burner and the copper strip is reduced. is small,
Therefore, the furnace volume is also small, which, together with the fluctuations in the amount of waste gas mentioned above, is a factor that increases the fluctuations in the pressure inside the furnace. An installed waste gas damper (not shown) allows
Although it is controlled to about 5-10 mmH2O,
The pressure fluctuation when the burner is turned on and off is rapid, and it is difficult for a damper with a slow response to absorb this sudden pressure fluctuation.
また、直火加熱炉３３は、予熱炉３２とは上部スロート
部４６で、無酸化雰囲気炉３７とは下部スロート部４７
で雰囲気が仕切られているが、鋼帯３１が炉体の煉瓦と
接触して、すり疵がっ性するのを防止するため、スロー
ト部の隙間は１００１程度あるので、炉から炉への圧力
伝搬の防止にはほとんどなりえず、直火加熱炉３３での
点火時あるいは消火時のような圧力変動の２〜３秒後に
は、無酸化雰囲気炉３７でも第５図に示すような同様な
圧力変動が起こり、圧力がハンチングして負圧となり、
炉のシール性に異状をきたしている場合は、炉内に空気
を吸い込んで、鋼帯３１が酸化する事態が発生している
。Further, the direct fire heating furnace 33 is different from the preheating furnace 32 in an upper throat portion 46 and in the non-oxidizing atmosphere furnace 37 is a lower throat portion 47.
However, in order to prevent the steel strip 31 from coming into contact with the bricks of the furnace body and causing scratches, there is a gap of about 100 mm at the throat, so the pressure from one furnace to the other is It is hardly possible to prevent the propagation, and 2 to 3 seconds after pressure fluctuation occurs during ignition or extinguishing in the direct-fired heating furnace 33, a similar phenomenon as shown in Fig. 5 occurs in the non-oxidizing atmosphere furnace 37. Pressure fluctuations occur, pressure hunts and becomes negative pressure,
If the sealing performance of the furnace is abnormal, air may be sucked into the furnace and the steel strip 31 may become oxidized.
［発明が解決しようとする課１！］
以上のような炉から炉への圧力の伝搬を防止する対策と
して、発明者等は特公昭６２−５７６９２号記載の技術
を提唱している。この技術は、第６図のように直火式竪
型連続焼鈍炉において、竪型直火加熱炉３３と無酸化雰
囲気炉３７との接続部分に、両炉よりも高い内圧に保た
れる中間室５１を設けたものである。この中間室５１に
より、炉から炉への炉内圧力の伝搬を防止しようとする
ものであるが、この中間室５１への鋼帯３１の入口５２
および出口５３は、表面品質に対する要求が厳しい鋼帯
３１が絶えず高速で通過するので、鋼帯３１が接触しな
いだけの十分な隙間を明けていなければならず、そのた
め中間室５１の内圧のみを前後の炉圧よりも高く保つこ
とは非常に困難であった。また、中間室５１の内圧を前
後の両炉の内圧より高く保つことは、直火加熱炉３３の
消火時には効果があるが、点火時には必ずしも高くしな
いことが良いことが分かった。すなわち、中間室５１の
内圧は、必ずしも高く保つだけではなく、中間室５１の
内圧が適切にコントロールできること、また内圧を適切
な状態に保つための気密性があることが必要であること
がわかった。[Lesson 1 that the invention attempts to solve! ] As a measure to prevent pressure from propagating from one furnace to another as described above, the inventors have proposed a technique described in Japanese Patent Publication No. 62-57692. As shown in Fig. 6, in a direct-fired vertical continuous annealing furnace, an intermediate part is installed between the vertical direct-fired heating furnace 33 and the non-oxidizing atmosphere furnace 37, which is maintained at a higher internal pressure than both furnaces. A chamber 51 is provided. This intermediate chamber 51 is intended to prevent the pressure inside the furnace from propagating from one furnace to another, but the entrance 52 of the steel strip 31 to this intermediate chamber 51 is
Since the steel strip 31, which has strict requirements for surface quality, constantly passes through the outlet 53 at high speed, it is necessary to provide a sufficient gap so that the steel strip 31 does not come into contact with each other. It was very difficult to maintain the furnace pressure higher than that of the furnace. Furthermore, it has been found that although maintaining the internal pressure of the intermediate chamber 51 higher than the internal pressure of both the front and rear furnaces is effective when extinguishing the direct-fired heating furnace 33, it is not necessarily high when igniting. In other words, it has been found that the internal pressure of the intermediate chamber 51 must not only be kept high, but also that the internal pressure of the intermediate chamber 51 can be appropriately controlled, and that it must be airtight to maintain the internal pressure in an appropriate state. .
この発明は、従来技術の上述のような問題点を解消し、
直火式竪型連続焼鈍炉において、直火加熱炉の圧力変動
を無酸化雰囲気炉に伝搬させない中間室を有する直火式
竪型連続焼鈍炉とその操業方法を提供することを目的と
している。This invention solves the above-mentioned problems of the prior art,
An object of the present invention is to provide a direct-fired vertical continuous annealing furnace having an intermediate chamber that prevents pressure fluctuations in the direct-fired heating furnace from propagating to the non-oxidizing atmosphere furnace, and a method for operating the same.
［課題を解決するための手段］
この発明に係る直火式竪型連続焼鈍炉は、竪型直火加熱
炉と、それに続く無酸化雰囲気炉との接続部分に気密性
に優れた中間室を設けた直火式竪型連続焼鈍炉において
、前記中間室呻不活性ガスを供給する手段と不活性ガス
を排出する手段とを設けた直火式竪型連続焼鈍炉であり
、竪型直火加熱炉と、それに続く無酸化雰囲気炉との接
続部分に気密性に優れた中間室を設けた直火式竪型連続
焼鈍炉において、前記中間室の前後のデフレクタ−ロー
ルと中間室との間に、デフレクタ−ロールと中間室との
閏を気密に保つためのボックスガイドを設けるとともに
、前記中間室に不活性ガスを供給する手段と不活性ガス
を排出する手段とを設けた直火式竪型連続焼鈍炉である
。[Means for Solving the Problems] The direct-fired vertical continuous annealing furnace according to the present invention includes an intermediate chamber with excellent airtightness at the connecting portion between the vertical direct-fired heating furnace and the non-oxidizing atmosphere furnace that follows it. The direct-fired vertical continuous annealing furnace is equipped with a means for supplying an inert gas into the intermediate chamber and a means for discharging the inert gas. In a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connecting part between the heating furnace and the subsequent non-oxidizing atmosphere furnace, the space between the deflector rolls before and after the intermediate chamber and the intermediate chamber A direct-fired vertical shaft is provided with a box guide for keeping the gap between the deflector roll and the intermediate chamber airtight, as well as means for supplying inert gas to the intermediate chamber and means for discharging inert gas. This is a type continuous annealing furnace.
またこの発明に係る直火式竪型連続焼鈍炉の操業方法は
、竪型直火加熱炉と、それに続く無酸化雰囲気炉との接
続部分に気密性に優れた中間室を設けた直火式竪型連続
焼鈍炉において、前記中間室に不活性ガスを供給する手
段と不活性ガスを排出する手段とを設けて、竪型直火加
熱炉の炉圧が低下した時は前記中間室に不活性ガスを供
給し、竪型直火加熱デの炉圧が上昇した時は前記中間室
から不活性ガスを排出して前記無酸化雰囲気炉の炉圧の
変動を小さくした直火式竪型連続焼鈍炉の操業方法であ
り、竪型直火加熱炉と、それに続く無酸化雰囲気炉との
接続部分に気密性に優れた中間室を設けた直火式竪型連
続焼鈍炉において、前記中間室の前後のデフレクタ−ロ
ールと中間室との間に、デフレクタ−ロールと中間室と
の間を気密に保つためのボックスガイドを設けるととも
に、前記中間室に不活性ガスを供給する手段と不活性ガ
スを排出する手段とを設けて、竪型直火加熱炉の炉圧が
低下した時は前記中間室に不活性ガスを供給し、竪型直
火加熱炉の炉圧が上昇した時は前記中間室から不活性ガ
スを排出して前記無酸化雰囲気炉の炉圧の変動を小さく
した直火式竪型連続焼鈍炉の操業方法である。Further, the operating method of the direct-fired vertical continuous annealing furnace according to the present invention is a direct-fired type in which an intermediate chamber with excellent airtightness is provided at the connection part between the vertical direct-fired heating furnace and the subsequent non-oxidizing atmosphere furnace. In the vertical continuous annealing furnace, means for supplying inert gas to the intermediate chamber and means for discharging inert gas are provided, so that when the furnace pressure of the vertical direct-fired heating furnace decreases, the intermediate chamber is filled with inert gas. A direct-fired vertical continuous furnace that supplies active gas and discharges inert gas from the intermediate chamber when the furnace pressure of the vertical direct-fired heating furnace rises to reduce fluctuations in the furnace pressure of the non-oxidizing atmosphere furnace. This is an operating method of an annealing furnace, in which a direct-fired vertical continuous annealing furnace is provided with an intermediate chamber with excellent airtightness at the connection part between a vertical direct-fired heating furnace and a subsequent non-oxidizing atmosphere furnace. A box guide is provided between the front and rear deflector rolls and the intermediate chamber to keep the space between the deflector roll and the intermediate chamber airtight, and a means for supplying an inert gas to the intermediate chamber is provided. When the furnace pressure of the vertical direct-fired heating furnace decreases, inert gas is supplied to the intermediate chamber, and when the furnace pressure of the vertical direct-fired heating furnace increases, the inert gas is supplied to the intermediate chamber. This is a method of operating a direct-fired vertical continuous annealing furnace in which fluctuations in furnace pressure in the non-oxidizing atmosphere furnace are reduced by discharging inert gas from the chamber.
［作用］
この発明に係る直火式竪型連続焼鈍炉は、竪型直火加熱
炉と、それに続く無酸化雰囲気炉との接続部分に気密性
に優れた中間室を設けた直火式竪型連続焼鈍炉において
、前記中間室に不活性ガスを供給する手段と不活性ガス
を排出する手段とを設た直火式竪型連続焼鈍炉において
は、中間室に不活性ガスを供給し排出することにより、
直火加熱炉の圧力変動の無酸化雰囲気炉への影響を防止
してやることができる。また竪型直火加熱炉と、それに
続く無酸化雰囲気炉との接続部分に気密性に優れた中間
室を設けた直火式竪型連続焼鈍炉において、前記中間室
の前後のデフレクタ−ロールと中間室との間に、デフレ
クタ−ロールと中間室との間を気密に保つためのボック
スガイドを設けるとともに、前記中間室に不活性ガスを
供給する手段と不活性ガスを排出する手段とを設けた直
火式竪型連続焼鈍炉においては、中間室に不活性ガスを
供給し排出することにより、直火加熱炉の圧力変動の無
酸化雰囲気炉への影響を防止してやることができるとと
もに、前記ボックスガイドにより、中間室の気密性が高
まるので、よりきめ細かに中間室の内圧のコントロール
ができる。[Function] The direct-fired vertical continuous annealing furnace according to the present invention is a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connecting portion between the vertical direct-fired heating furnace and the non-oxidizing atmosphere furnace that follows it. In a direct-fired vertical continuous annealing furnace, which is equipped with a means for supplying an inert gas to the intermediate chamber and a means for discharging the inert gas, the inert gas is supplied to the intermediate chamber and the inert gas is discharged. By doing so,
It is possible to prevent pressure fluctuations in the direct-fired heating furnace from affecting the non-oxidizing atmosphere furnace. In addition, in a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connection part between a vertical direct-fired heating furnace and a subsequent non-oxidizing atmosphere furnace, deflector rolls before and after the intermediate chamber are used. A box guide is provided between the deflector roll and the intermediate chamber to maintain airtightness between the deflector roll and the intermediate chamber, and means for supplying inert gas to the intermediate chamber and means for discharging inert gas are provided. In the direct-fired vertical continuous annealing furnace, by supplying and discharging inert gas to the intermediate chamber, it is possible to prevent pressure fluctuations in the direct-fired heating furnace from affecting the non-oxidizing atmosphere furnace. Since the box guide increases the airtightness of the intermediate chamber, it is possible to more precisely control the internal pressure of the intermediate chamber.
またこの発明に係る直火式竪型連続焼鈍炉の操業方法の
うち、竪型直火加熱炉と、それに続く無酸化雰囲気炉と
の接続部分に気密性に優れた中間室を設けた直火式竪型
連続焼鈍炉において、前記中間室に不活性ガスを供給す
る手段と不活性ガスを排出する手段とを設けて、竪型直
火加熱炉の炉圧が低下した時は前記中間室に不活性ガス
を供給し、竪型直火加熱炉の炉圧が上昇した時は前記中
間室から不活性ガスを排出するようにした直火式竪型連
続焼鈍炉の操業方法においては、前記不活性ガスの供給
排出により、無酸化雰囲気炉の炉圧変動を小さくしてや
ることができる。また竪型直火加熱炉と、それに続く無
酸化雰囲気炉との接続部分に気密性に優れた中間室を設
けた直火式竪型連続焼鈍炉において、前記中間室の前後
のデフレクタ−ロールと中間室との間に、デフレクタ−
ロールと中間室との間を気密に保つためのボックスガイ
ドを設けるとともに、前記中間室に不活性ガスを供給す
る手段と不活性ガスを排出する手段とを設けて、竪型直
火加熱炉の炉圧が低下した時は前記中間室に不活性ガス
を供給し、竪型直火加熱炉の炉圧が上昇した時は前記中
間室から不活性ガスを排出する直火式竪型連続焼鈍炉の
操業方法においては、ボックスガイドにより、中間室の
気密性を高めているので、よりきめ細かな内圧のコント
ロールができ、無酸化雰囲気炉の炉圧変動をより小さく
してやることができる。Furthermore, among the operating methods of the direct-fired vertical continuous annealing furnace according to the present invention, there is provided a method for operating a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connecting portion between the vertical direct-fired heating furnace and the subsequent non-oxidizing atmosphere furnace. In the vertical type continuous annealing furnace, a means for supplying an inert gas to the intermediate chamber and a means for discharging the inert gas are provided, so that when the furnace pressure of the vertical direct-fired heating furnace decreases, the intermediate chamber is supplied with an inert gas. In the operating method of a direct-fired vertical continuous annealing furnace, the inert gas is supplied and the inert gas is discharged from the intermediate chamber when the furnace pressure of the vertical direct-fired heating furnace increases. By supplying and discharging active gas, fluctuations in furnace pressure in a non-oxidizing atmosphere furnace can be reduced. In addition, in a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connection part between a vertical direct-fired heating furnace and a subsequent non-oxidizing atmosphere furnace, deflector rolls before and after the intermediate chamber are used. A deflector is installed between the intermediate chamber and
A box guide is provided to keep the space between the roll and the intermediate chamber airtight, and means for supplying inert gas to the intermediate chamber and means for discharging the inert gas are provided. A direct-fired vertical continuous annealing furnace that supplies inert gas to the intermediate chamber when the furnace pressure decreases, and discharges the inert gas from the intermediate chamber when the furnace pressure of the vertical direct-fired heating furnace increases. In this operating method, the box guide improves the airtightness of the intermediate chamber, so it is possible to more precisely control the internal pressure, and it is possible to further reduce furnace pressure fluctuations in the non-oxidizing atmosphere furnace.
［実施例］
本発明の１実施例の直火式竪型連続焼鈍炉およびその操
業方法を、第１図および第２図に基づき説明する。第１
図は、本発明の第１の実施例の直火式竪型連続焼鈍炉の
直火加熱炉１と無酸化雰囲気炉２との接続部に設けた中
間室３部分を中心とした縦断面図である。この直火式竪
型連続焼鈍炉のその他の部分については、従来の直火式
竪型連続焼鈍炉と変更がないので説明を省略し、前記中
間室３を中心に説明する。この中間室３は、直火加熱炉
１の下部スロート部４の下方に配置しである下部デフレ
クタ−ロール５と、無酸化雰囲気炉２の入口に配置しで
ある無酸化雰囲気炉入口デフレクタ−ロール６との間に
設けている。この中間室３を詳述すると、中間室３の鋼
帯７の入口８及び出口９は、鋼帯７との隙間ができるだ
け狭くなるように構成されている。そして、この中間室
３に電磁弁１０を作動させることにより不活性ガスを吹
き込むことができる不活性ガス供給管１１と、中間室３
中の不活性ガスを排出するためのバブラー１２とが設け
られている。[Example] A direct-fired vertical continuous annealing furnace and its operating method according to an example of the present invention will be described with reference to FIGS. 1 and 2. 1st
The figure is a longitudinal cross-sectional view centered on the intermediate chamber 3 provided at the connection between the direct-fired vertical heating furnace 1 and the non-oxidizing atmosphere furnace 2 of the direct-fired vertical continuous annealing furnace according to the first embodiment of the present invention. It is. The other parts of this direct-fired vertical continuous annealing furnace are the same as those of the conventional direct-fired vertical continuous annealing furnace, so the explanation will be omitted, and the explanation will focus on the intermediate chamber 3. This intermediate chamber 3 includes a lower deflector roll 5 disposed below the lower throat portion 4 of the direct-fired heating furnace 1 and a non-oxidizing atmosphere furnace inlet deflector roll disposed at the inlet of the non-oxidizing atmosphere furnace 2. 6. Describing this intermediate chamber 3 in detail, the inlet 8 and outlet 9 of the steel strip 7 in the intermediate chamber 3 are configured so that the gap between them and the steel strip 7 is as narrow as possible. An inert gas supply pipe 11 that can blow inert gas into the intermediate chamber 3 by operating a solenoid valve 10, and an inert gas supply pipe 11 that can blow inert gas into the intermediate chamber 3
A bubbler 12 is provided for discharging inert gas therein.
次にこの中間室３の使用方法を説明すると、直火加熱炉
１の消火時のように直火加熱炉１の炉圧が急激に下がっ
た時には、この炉圧の低下が無酸化雰囲気炉２に伝搬し
て、無酸化雰囲気炉２の炉圧が低下し、外部の空気を吸
い込んで鋼帯７が酸化されるのを防止するため、電磁弁
１０を作動させて不活性ガスを中間室３に供給して、中
間室３の内圧を高めて、直火加熱炉１の炉圧低下の影響
を遮断するようにしている。また、直火加熱炉１の点火
時のように直火加熱炉１の炉圧が急激に上昇した時には
、バブラー１２により中間室内の不活性ガスを外部に放
出させて、中間室３の内圧を低下させてやり、直火加熱
炉１の炉圧の上昇が無酸化雰囲気炉２に伝搬されないよ
うにしている。Next, to explain how to use this intermediate chamber 3, when the furnace pressure of the direct-fired heating furnace 1 suddenly drops, such as when the direct-fired heating furnace 1 is extinguished, this decrease in furnace pressure In order to prevent the steel strip 7 from being oxidized due to the decrease in the furnace pressure of the non-oxidizing atmosphere furnace 2 and the suction of outside air, the solenoid valve 10 is operated to supply inert gas to the intermediate chamber 3. is supplied to increase the internal pressure of the intermediate chamber 3, thereby blocking the influence of a decrease in the furnace pressure of the direct-fired heating furnace 1. Furthermore, when the furnace pressure of the direct-fired heating furnace 1 rises rapidly, such as when the direct-fired heating furnace 1 is ignited, the bubbler 12 releases the inert gas in the intermediate chamber to the outside to reduce the internal pressure of the intermediate chamber 3. The increase in the furnace pressure in the direct-fired heating furnace 1 is prevented from propagating to the non-oxidizing atmosphere furnace 2.
なお、中間室３の内圧を何気圧に設定するかは。Furthermore, at what atmospheric pressure should the internal pressure of the intermediate chamber 3 be set?
バブラー１２の水頭Ｈを調整することにより行なうこと
ができる。This can be done by adjusting the water head H of the bubbler 12.
本発明の１実施例の直火式竪型連続焼鈍炉は上述のよう
に構成され、その操業方法も上述したように行なわれる
ので、無酸化雰囲気炉２の炉圧の変動を小さくしてやる
ことができる。Since the direct-fired vertical continuous annealing furnace according to one embodiment of the present invention is constructed as described above and its operating method is also performed as described above, fluctuations in the furnace pressure of the non-oxidizing atmosphere furnace 2 can be reduced. can.
第２図は、本発明の第２の実施例の直火式竪型連続焼鈍
炉の直火加熱炉１と無酸化雰囲気炉２との接続部に設け
た中間室３部分を中心とした縦断面図である。この中間
室３の構成は、第１の実施例の中間室３の構成に加えて
、下部デフレクタ−ロール５と中間室入口８との間を気
密に保つボックスガイド１３ａと、無酸化雰囲気炉入口
デフレクタ−ロール６と中間室出口９との間を気密に保
つボックスガイド１３ｂとを設けている。このボックス
ガイド１３ａおよび１３ｂを詳述すると、このボックス
ガイド１３ａおよび１３ｂは筒状になっており、一端は
中間室３の入口８および出口９に固着されている。そし
て他端は、デフレクタ−ロール５．６の外周面およびデ
フレクタ−ロール５および６の下部に配置したシールロ
ール１４ａおよび１４ｂの外周面に添うように形成され
ている。そしてこの端面とロール間の隙間を極力小さく
して気密性を高めるようにしている。FIG. 2 shows a longitudinal section centered on the intermediate chamber 3 provided at the connection between the direct-fired vertical heating furnace 1 and the non-oxidizing atmosphere furnace 2 of the direct-fired vertical continuous annealing furnace according to the second embodiment of the present invention. It is a front view. In addition to the configuration of the intermediate chamber 3 of the first embodiment, the configuration of this intermediate chamber 3 includes a box guide 13a that keeps the space between the lower deflector roll 5 and the intermediate chamber inlet 8 airtight, and a non-oxidizing atmosphere furnace inlet. A box guide 13b is provided to keep the space between the deflector roll 6 and the intermediate chamber outlet 9 airtight. In detail, the box guides 13a and 13b have a cylindrical shape, and one end is fixed to the inlet 8 and outlet 9 of the intermediate chamber 3. The other end is formed along the outer circumferential surface of the deflector roll 5.6 and the outer circumferential surfaces of the seal rolls 14a and 14b disposed below the deflector rolls 5 and 6. The gap between this end face and the roll is made as small as possible to improve airtightness.
この中間室３の使用方法は、第１の実施例の場合と同じ
であるが、第２の実施例の場合には、上述したようなボ
ックスガイドを設けているので、中間室３からの不活性
ガスの洩れが少なく、第１の実施例よりさらに細かい炉
圧コントロールができる。The method of using this intermediate chamber 3 is the same as in the case of the first embodiment, but in the case of the second embodiment, since a box guide as described above is provided, there is no interference from the intermediate chamber 3. There is less leakage of active gas, and furnace pressure can be controlled more precisely than in the first embodiment.
［発明の効果コ
この発明により、無酸化雰囲気炉の炉圧変動を小さくし
てやることができる。[Effects of the Invention] According to the present invention, fluctuations in furnace pressure in a non-oxidizing atmosphere furnace can be reduced.
第１図は本発明の第１の実施例の直火式竪型連続焼鈍炉
の直火加熱炉と無酸化雰囲気炉との接続部に設けた中間
室部分を中心とした縦断面図、第２図は本発明の第２の
実施例の直火式竪型連続焼鈍炉の直火加熱炉と無酸化雰
囲気炉との接続部に設けた中間室部分を中心とした縦断
面図、第３図は従来の直火式竪型連続焼鈍炉の縦断面図
、第４図は従来の直火加熱炉の縦断面図、第５図は炉圧
の変動状況を示すグラフ、第６図は従来の他の直火式竪
型連続焼鈍炉の主要部の縦断面図である。
１・・・直火加熱炉、２・・・無酸化雰囲気炉、３・・
・中間室、５・・・下部デフレクタ−ロール、６・・・
無酸化雰囲気炉入口デフレクタ−ロール、７・・・鋼帯
、１０・・・電磁弁、
１１・・・不活性ガス供給管、１２・・・バブラー、１
３ａ、１３ｂ・・・ボックスガイド。
出願人 日本鋼管株式会社 −
第３図
第４図
第５図
第６図FIG. 1 is a longitudinal cross-sectional view centered on an intermediate chamber portion provided at the connection between the direct-fired vertical heating furnace and the non-oxidizing atmosphere furnace of the direct-fired vertical continuous annealing furnace according to the first embodiment of the present invention; Figure 2 is a vertical sectional view centered on the intermediate chamber provided at the connection between the direct-fired vertical continuous annealing furnace and the non-oxidizing atmosphere furnace of the direct-fired vertical continuous annealing furnace according to the second embodiment of the present invention; Figure 4 is a vertical cross-sectional view of a conventional direct-fired vertical continuous annealing furnace, Figure 4 is a vertical cross-sectional view of a conventional direct-fired heating furnace, Figure 5 is a graph showing changes in furnace pressure, and Figure 6 is a conventional FIG. 2 is a vertical cross-sectional view of the main part of another direct-fired vertical continuous annealing furnace. 1... Direct fire heating furnace, 2... Non-oxidizing atmosphere furnace, 3...
・Intermediate chamber, 5...Lower deflector roll, 6...
Non-oxidizing atmosphere furnace inlet deflector roll, 7... Steel strip, 10... Solenoid valve, 11... Inert gas supply pipe, 12... Bubbler, 1
3a, 13b...Box guide. Applicant Nippon Kokan Co., Ltd. - Figure 3 Figure 4 Figure 5 Figure 6
Claims (4)
の接続部分に気密性に優れた中間室を設けた直火式竪型
連続焼鈍炉において、前記中間室に不活性ガスを供給す
る手段と不活性ガスを排出する手段とを設けたことを特
徴とする直火式竪型連続焼鈍炉。(1) In a direct-fired vertical continuous annealing furnace in which an airtight intermediate chamber is provided at the connection between the vertical direct-fired heating furnace and the subsequent non-oxidizing atmosphere furnace, an inert gas is supplied to the intermediate chamber. A direct-fired vertical continuous annealing furnace characterized by being provided with a means for supplying an inert gas and a means for discharging an inert gas.
の接続部分に気密性に優れた中間室を設けた直火式竪型
連続焼鈍炉において、前記中間室の前後のデフレクター
ロールと中間室との間に、デフレクターロールと中間室
との間を気密に保つためのボックスガイドを設けるとと
もに、前記中間室に不活性ガスを供給する手段と不活性
ガスを排出する手段とを設けたことを特徴とする直火式
竪型連続焼鈍炉。(2) In a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connection between a vertical direct-fired heating furnace and a subsequent non-oxidizing atmosphere furnace, deflector rolls before and after the intermediate chamber are used. A box guide is provided between the deflector roll and the intermediate chamber to keep the space between the deflector roll and the intermediate chamber airtight, and a means for supplying an inert gas to the intermediate chamber and a means for discharging the inert gas are provided. Direct-fired vertical continuous annealing furnace.
の接続部分に気密性に優れた中間室を設けた直火式竪型
連続焼鈍炉において、前記中間室に不活性ガスを供給す
る手段と不活性ガスを排出する手段とを設けて、竪型直
火加熱炉の炉圧が低下した時は前記中間室に不活性ガス
を供給し、竪型直火加熱炉の炉圧が上昇した時は前記中
間室から不活性ガスを排出して前記無酸化雰囲気炉の炉
圧の変動を小さくしたことを特徴とする直火式竪型連続
焼鈍炉の操業方法。(3) In a direct-fired vertical continuous annealing furnace in which an airtight intermediate chamber is provided at the connection between the vertical direct-fired heating furnace and the subsequent non-oxidizing atmosphere furnace, an inert gas is supplied to the intermediate chamber. A means for supplying inert gas and a means for discharging inert gas are provided, and when the furnace pressure of the vertical direct-fired heating furnace decreases, the inert gas is supplied to the intermediate chamber, and the furnace pressure of the vertical direct-fired heating furnace is reduced. 1. A method for operating a direct-fired vertical continuous annealing furnace, characterized in that when the temperature rises, inert gas is discharged from the intermediate chamber to reduce fluctuations in the furnace pressure of the non-oxidizing atmosphere furnace.
の接続部分に気密性に優れた中間室を設けた直火式竪型
連続焼鈍炉において、前記中間室の前後のデフレクター
ロールと中間室との間に、デフレクターロールと中間室
との間を気密に保つためのボックスガイドを設けるとと
もに、前記中間室に不活性ガスを供給する手段と不活性
ガスを排出する手段とを設けて、竪型直火加熱炉の炉圧
が低下した時は前記中間室に不活性ガスを供給し、竪型
直火加熱炉の炉圧が上昇した時は前記中間室から不活性
ガスを排出して前記無酸化雰囲気炉の炉圧の変動を小さ
くしたことを特徴とする直火式竪型連続焼鈍炉の操業方
法。(4) In a direct-fired vertical continuous annealing furnace in which an intermediate chamber with excellent airtightness is provided at the connection part between a vertical direct-fired heating furnace and a subsequent non-oxidizing atmosphere furnace, deflector rolls before and after the intermediate chamber are provided. A box guide is provided between the deflector roll and the intermediate chamber to keep the space between the deflector roll and the intermediate chamber airtight, and a means for supplying an inert gas to the intermediate chamber and a means for discharging the inert gas are provided. When the furnace pressure of the vertical direct-fired heating furnace decreases, inert gas is supplied to the intermediate chamber, and when the furnace pressure of the vertical direct-fired heating furnace increases, the inert gas is discharged from the intermediate chamber. A method for operating a direct-fired vertical continuous annealing furnace, characterized in that fluctuations in the furnace pressure of the non-oxidizing atmosphere furnace are reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1131074A JPH089737B2 (en) | 1989-05-24 | 1989-05-24 | Direct-fire type hard-type continuous annealing furnace and its operating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1131074A JPH089737B2 (en) | 1989-05-24 | 1989-05-24 | Direct-fire type hard-type continuous annealing furnace and its operating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02310323A true JPH02310323A (en) | 1990-12-26 |
| JPH089737B2 JPH089737B2 (en) | 1996-01-31 |
Family
ID=15049384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1131074A Expired - Fee Related JPH089737B2 (en) | 1989-05-24 | 1989-05-24 | Direct-fire type hard-type continuous annealing furnace and its operating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089737B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017072989A1 (en) * | 2015-10-27 | 2017-05-04 | Ｊｆｅスチール株式会社 | Method for manufacturing hot-dip galvanized steel sheet |
| CN111910070A (en) * | 2020-08-10 | 2020-11-10 | 中冶赛迪技术研究中心有限公司 | Hearth pressure control system and control method of strip steel vertical annealing furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6385659U (en) * | 1986-11-19 | 1988-06-04 |
-
1989
- 1989-05-24 JP JP1131074A patent/JPH089737B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6385659U (en) * | 1986-11-19 | 1988-06-04 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017072989A1 (en) * | 2015-10-27 | 2017-05-04 | Ｊｆｅスチール株式会社 | Method for manufacturing hot-dip galvanized steel sheet |
| JP2017082278A (en) * | 2015-10-27 | 2017-05-18 | Ｊｆｅスチール株式会社 | Method for manufacturing hot-dip galvanized steel sheet |
| CN108138297A (en) * | 2015-10-27 | 2018-06-08 | 杰富意钢铁株式会社 | The manufacturing method of hot-dip galvanized steel sheet |
| KR20180064497A (en) * | 2015-10-27 | 2018-06-14 | 제이에프이 스틸 가부시키가이샤 | Manufacturing method of hot-dip galvanized steel sheet |
| CN111910070A (en) * | 2020-08-10 | 2020-11-10 | 中冶赛迪技术研究中心有限公司 | Hearth pressure control system and control method of strip steel vertical annealing furnace |
| CN111910070B (en) * | 2020-08-10 | 2022-03-08 | 重庆赛迪热工环保工程技术有限公司 | Hearth pressure control system and control method of strip steel vertical annealing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH089737B2 (en) | 1996-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4691898A (en) | Continuous annealing furnace for metallic strip | |
| US4760995A (en) | Continuously treating line for steel bands having a heating furnace by directly flaming | |
| JPH02310323A (en) | Direct-fired vertical continuous annealing furnace and operation thereof | |
| EP0905262B1 (en) | Heating method and heating apparatus | |
| EP0506043B1 (en) | Burner for generating soot and furnace to deposit soot by using the same | |
| JPH08247421A (en) | Radiant tube burner | |
| JPH08199246A (en) | Continuous annealing furnace | |
| JPS6257692B2 (en) | ||
| JPS59134412A (en) | Combustion of mixed firing burner for ignition of sintering furnace | |
| JP3337584B2 (en) | Heating furnace combustion method | |
| JPH09256071A (en) | Continuous annealing method and apparatus therefor | |
| JP3143937B2 (en) | Continuous annealing furnace | |
| JP2755089B2 (en) | Combustion method for continuous heating furnace with regenerative burner | |
| JPH0332496Y2 (en) | ||
| JPH07138635A (en) | Non-oxidizing heating method of steel | |
| JPH07310117A (en) | Direct firing reduction heating method for metal | |
| JPS6029426A (en) | Device for controlling temperature in roll chamber of vertical type plural pass direct-firing heating furnace | |
| JPH093507A (en) | Pre-sintering apparatus | |
| JPH02267232A (en) | Continuous annealing method | |
| JPH06346153A (en) | Method for direct firing reduction heating and burner structure therefor | |
| JPH0121204B2 (en) | ||
| SU1039967A1 (en) | Method for smelting steel in double-tank furnace | |
| JPH1112658A (en) | Method for preheating steel sheet in continuous annealing equipment | |
| JPH01269802A (en) | Method and apparatus for combustion in radiant tube burner | |
| JPH0920919A (en) | Method for non-oxidize-heating steel material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080131 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090131 Year of fee payment: 13 |
|
| LAPS | Cancellation because of no payment of annual fees |