JP4482417B2 - Continuous annealing furnace - Google Patents

Continuous annealing furnace Download PDF

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JP4482417B2
JP4482417B2 JP2004294159A JP2004294159A JP4482417B2 JP 4482417 B2 JP4482417 B2 JP 4482417B2 JP 2004294159 A JP2004294159 A JP 2004294159A JP 2004294159 A JP2004294159 A JP 2004294159A JP 4482417 B2 JP4482417 B2 JP 4482417B2
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strip steel
steel plate
continuous annealing
annealing furnace
furnace
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JP2006104535A (en
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幸一 松尾
剛 浅本
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Nippon Steel Corp
Nippon Steel Engineering Co Ltd
Nippon Steel Plant Designing Corp
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Nittetsu Plant Designing Corp
Nippon Steel Corp
Nippon Steel Engineering Co Ltd
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Description

本発明は、火炎バーナを用いる無酸化炉方式による帯状鋼板の連続焼鈍炉に関し、特にその炉形状に関するものである。   The present invention relates to a continuous annealing furnace for strip steel sheets by a non-oxidizing furnace system using a flame burner, and particularly relates to the furnace shape.

火炎バーナを用いる無酸化炉方式による帯状鋼板の連続焼鈍炉においては、帯状鋼板の幅方向エッジ部の過加熱による鋼板の幅方向の材質不均一、耳波の発生による板形状の悪化あるいはめっき時のめっき品質不良等が問題となっている。特に、より軟質なメッキ原板を製造するのに効果的な例えば７００℃を超えるような高温焼鈍を行う連続焼鈍炉においては、高温焼鈍に伴うバーナ容量アップにより帯状鋼板の幅方向エッジ部の過加熱による上記の諸問題が顕著となる。   In a continuous annealing furnace for strip steel sheets by a non-oxidation furnace method using a flame burner, the material in the width direction of the steel sheet is not uniform due to overheating of the edge of the strip steel sheet in the width direction, the plate shape deteriorates due to the generation of ear waves, or during plating Insufficient plating quality is a problem. In particular, in a continuous annealing furnace that performs high-temperature annealing exceeding 700 ° C., which is effective for producing a softer plating original plate, overheating of the edge in the width direction of the strip steel plate due to an increase in burner capacity accompanying high-temperature annealing The above problems due to the above become significant.

連続焼鈍炉における帯状鋼板の幅方向エッジ部の過加熱防止を課題としている従来技術としては、特許文献１に開示されたものがある。この特許文献１の連続焼鈍炉では、帯状鋼板の加熱にラジアントチューブが使用されており、帯状鋼板のエッジ部過加熱の原因を炉壁からの輻射加熱によるとして、炉内へ供給している雰囲気ガスを炉壁に沿って吹込んでやることで炉壁を緩冷却し、炉壁から帯状鋼板エッジ部への輻射熱を減少させ、帯状鋼板エッジ部の過加熱を防止するようにしている。   As a prior art which makes the subject the overheating prevention of the width direction edge part of the strip | belt-shaped steel plate in a continuous annealing furnace, there exists what was disclosed by patent document 1. FIG. In the continuous annealing furnace of Patent Document 1, a radiant tube is used for heating the strip steel plate, and the atmosphere in which the edge portion overheating of the strip steel plate is caused by radiation heating from the furnace wall is supplied into the furnace. By blowing the gas along the furnace wall, the furnace wall is slowly cooled to reduce the radiant heat from the furnace wall to the strip steel plate edge portion, thereby preventing overheating of the strip steel plate edge portion.

また、引用文献２には、本発明と同様に火炎バーナを用いて帯状鋼板を加熱する無酸化炉方式の連続焼鈍炉が開示されている。この特許文献２の連続焼鈍炉では、図６に示すように、帯状鋼板４の幅方向に板温度測定器８を設け、測定された板温分布に基づき帯状鋼板エッジ部の過加熱分を冷却する冷却装置６を上バーナ１、下バーナ２と対向する位置の側壁３に付設している。これにより、上バーナ１、下バーナ２の火炎による対向壁面からの輻射による帯状鋼板幅方向エッジ部の過加熱を防止するようにしている。
特開平７−６２４５０号公報 特開平７−４１８６８号公報 Further, cited document 2 discloses a non-oxidizing furnace type continuous annealing furnace in which a strip steel plate is heated using a flame burner as in the present invention. In the continuous annealing furnace of Patent Document 2, as shown in FIG. 6, a plate temperature measuring device 8 is provided in the width direction of the strip steel plate 4, and the overheated portion of the strip steel plate edge is cooled based on the measured plate temperature distribution. The cooling device 6 is attached to the side wall 3 at a position facing the upper burner 1 and the lower burner 2. Thereby, the overheating of the edge part in the strip | belt-shaped steel plate width direction by the radiation from the opposing wall surface by the flame of the upper burner 1 and the lower burner 2 is prevented.
JP-A-7-62450 Japanese Patent Laid-Open No. 7-41868

しかし、上記特許文献１に開示されている技術、すなわち炉内へ供給している雰囲気ガスを炉壁に沿って吹込んでやることで炉壁を冷却する技術では、炉内を冷却することになるので熱効率が下がる。また、特許文献２に開示されているようなバーナと対向する位置の側壁にクーリングチューブやウォータージャケット等の冷却装置を付設する技術では、設備新設の場合には多大な設備費が必要となり、改造の場合には多大な改造費が必要になるとともに大改造が必要となる。さらに、炉内を冷却することになるので熱効率が下がる。   However, in the technique disclosed in Patent Document 1, that is, the technique of cooling the furnace wall by blowing the atmospheric gas supplied into the furnace along the furnace wall, the inside of the furnace is cooled. As a result, the thermal efficiency decreases. In addition, in the technique of attaching a cooling device such as a cooling tube or a water jacket to the side wall facing the burner as disclosed in Patent Document 2, a large amount of equipment costs are required in the case of newly installing equipment. In this case, a great amount of remodeling costs are required and a large remodeling is required. Furthermore, since the inside of the furnace is cooled, the thermal efficiency is lowered.

本発明の目的は、火炎バーナを用いる無酸化炉方式による帯状鋼板の連続焼鈍炉において、連続焼鈍炉の炉壁を冷却し熱効率を低下させることなく、帯状鋼板エッジ部の過加熱を防止する技術を提供することにある。   An object of the present invention is a technique for preventing overheating of an edge portion of a strip steel plate in a continuous annealing furnace of a strip steel plate by a non-oxidation furnace method using a flame burner without cooling the furnace wall of the continuous annealing furnace and reducing the thermal efficiency. Is to provide.

上記目的を達成するために本発明は、火炎バーナを用いる無酸化炉方式による帯状鋼板の連続焼鈍炉において、走行する帯状鋼板のエッジ部と対向する連続焼鈍炉の両側壁のそれぞれに、帯状鋼板の走行方向に沿って火炎バーナを帯状鋼板の表面側と裏面側に交互に位置するように配置し、かつ、前記両側壁のそれぞれには、帯状鋼板のエッジ部と対向する位置を中心として帯状鋼板の走行方向と直交する方向に火炎バーナの配置位置以内の長さを有するとともに、炉内側に向けて５０〜２５０ｍｍの張り出し量を有し、かつ断面形状が矩形状で、帯状鋼板の走行方向に連続する張出部を設けたことを特徴とする。 In order to achieve the above object, the present invention provides a strip steel plate on each side wall of a continuous annealing furnace facing the edge of a strip steel plate in a continuous annealing furnace of a strip steel plate by a non-oxidation furnace method using a flame burner. The flame burners are arranged so as to be alternately positioned on the front side and the back side of the strip steel plate along the traveling direction of the strip, and each side wall has a strip shape centering on the position facing the edge of the strip steel plate. It has a length within the flame burner arrangement position in a direction orthogonal to the traveling direction of the steel sheet, has an overhang amount of 50 to 250 mm toward the inside of the furnace, has a rectangular cross-sectional shape, and the traveling direction of the strip steel sheet A continuous overhanging portion is provided.

本発明では、連続焼鈍炉の両側壁に設けた張出部により、走行する帯状鋼板の表面側に配置された火炎バーナの火炎による高温ガス流の帯状鋼板裏面側への廻りこみが妨げられ、また、走行する帯状鋼板の裏面側に配置された火炎バーナの火炎による高温ガス流の帯状鋼板表面側への廻りこみが妨げられる。その結果、高温ガス流による帯状鋼板エッジ部廻りの渦流が小さくなり、帯状鋼板のエッジ部過加熱を抑えることができる。   In the present invention, by the overhang portions provided on both side walls of the continuous annealing furnace, the wrapping of the high-temperature gas flow due to the flame of the flame burner arranged on the surface side of the traveling strip steel plate is prevented, Further, the high-temperature gas flow is prevented from flowing to the strip steel plate surface side by the flame of the flame burner disposed on the back side of the strip steel plate traveling. As a result, the eddy current around the edge of the strip steel plate due to the high-temperature gas flow is reduced, and overheating of the edge of the strip steel plate can be suppressed.

また、本発明では炉を冷却することなく帯状鋼板のエッジ部過加熱を抑えることができるため、従来技術のように熱効率を低下させることがない。さらに、帯状鋼板のエッジ部過加熱を抑えることができるため、帯状鋼板の幅方向の材質不均一、耳波の発生による板形状の悪化、あるいはめっき時のめっき品質不良等を抑えることができる。   Moreover, in this invention, since the edge part overheating of a strip | belt-shaped steel plate can be suppressed without cooling a furnace, thermal efficiency is not reduced like a prior art. Furthermore, since the edge portion overheating of the strip-shaped steel plate can be suppressed, it is possible to suppress uneven material in the width direction of the strip-shaped steel plate, deterioration of the plate shape due to the generation of ear waves, or poor plating quality during plating.

以下、本発明の実施の形態を図面に示す実施例に基づき説明する。   Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.

図１は、本発明による連続焼鈍炉の実施例を示す要部の概略斜視図、図２は、図１のＡ−Ａ断面図である。図１，２に示す連続焼鈍炉は横型であり、その中央部を帯状鋼板４が水平方向に走行する。   FIG. 1 is a schematic perspective view of a main part showing an embodiment of a continuous annealing furnace according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. The continuous annealing furnace shown in FIGS. 1 and 2 is a horizontal type, and a strip steel plate 4 travels in the horizontal direction at the center.

帯状鋼板４のエッジ部と対向する両側壁３，３には火炎バーナが配置されている。この火炎バーナは、走行する帯状鋼板４の表面側（上側）に位置する上バーナ１と、走行する帯状鋼板４の裏面側（下側）に位置する下バーナ２とからなり、帯状鋼板４の走行方向に沿って上バーナ１と下バーナ２とが交互に配置されている。また、一方の側壁３における上バーナ１と下バーナ２の配置パターンは、他方の側壁３における上バーナ１と下バーナ２の配置パターンと位相をずらしている。すなわち、一方の側壁３の上バーナ１（下バーナ２）と対向する位置の他方の側壁３には上バーナ１（下バーナ２）が配置されないようにしている。   A flame burner is disposed on both side walls 3 and 3 facing the edge of the strip steel plate 4. The flame burner includes an upper burner 1 positioned on the front surface side (upper side) of the traveling strip steel plate 4 and a lower burner 2 positioned on the rear surface side (lower side) of the traveling strip steel plate 4. Upper burners 1 and lower burners 2 are alternately arranged along the traveling direction. Further, the arrangement pattern of the upper burner 1 and the lower burner 2 on one side wall 3 is shifted in phase from the arrangement pattern of the upper burner 1 and the lower burner 2 on the other side wall 3. That is, the upper burner 1 (lower burner 2) is not arranged on the other side wall 3 at a position facing the upper burner 1 (lower burner 2) of one side wall 3.

さらに、本発明では、両側壁３，３の内面に帯状鋼板４の走行方向に沿って張出部５を設けている。この張出部５は、帯状鋼板４のエッジ部と対向する位置、言い換えれば上バーナ１と下バーナ２の中間部に設けられて、炉内側に向けて張り出している。   Furthermore, in this invention, the overhang | projection part 5 is provided in the inner surface of the side walls 3 and 3 along the running direction of the strip | belt-shaped steel plate 4. As shown in FIG. The overhanging portion 5 is provided at a position facing the edge portion of the strip steel plate 4, in other words, at an intermediate portion between the upper burner 1 and the lower burner 2, and extends toward the inside of the furnace.

図３は上下バーナ１、２の火炎による高温ガス流のＦＥＭ解析結果に基づいて描いた本実施例における高温ガス流れの模式図である。また、図４は、図１，２の連続焼鈍炉において張出部５を設けていない比較例における高温ガス流れの模式図である。   FIG. 3 is a schematic diagram of the hot gas flow in the present embodiment, drawn based on the FEM analysis result of the hot gas flow caused by the flames of the upper and lower burners 1 and 2. FIG. 4 is a schematic diagram of a high-temperature gas flow in a comparative example in which the overhang portion 5 is not provided in the continuous annealing furnace of FIGS.

張出部を設けていない比較例の場合、図４に示すように、上バーナ１の火炎による高温ガス流は上バーナ１と対向する位置の側壁３に衝突後、下方へ廻りこみ、帯状鋼板４のエッジ部廻りに渦流７を発生させる。また、下バーナ２の火炎による高温ガス流は下バーナ２と対向する位置の側壁３に衝突後、上方へ廻りこみ、帯状鋼板４のエッジ部廻りに渦流７を発生させる。   In the case of the comparative example in which no overhanging portion is provided, as shown in FIG. 4, the hot gas flow due to the flame of the upper burner 1 collides with the side wall 3 at a position facing the upper burner 1, and then wraps around downward. A vortex 7 is generated around the edge 4. Further, the high-temperature gas flow caused by the flame of the lower burner 2 collides with the side wall 3 at a position facing the lower burner 2 and then moves upward to generate a vortex 7 around the edge of the strip steel plate 4.

これに対して、上バーナ１と下バーナ２の中間部に張出部５を設けた実施例の場合、図３に示すように、側壁３に沿った高温ガス流が張出部５によって妨げられ、その結果、帯状鋼板４のエッジ部廻りの渦流が抑えられる。   On the other hand, in the case of the embodiment in which the overhang portion 5 is provided at the intermediate portion between the upper burner 1 and the lower burner 2, the hot gas flow along the side wall 3 is obstructed by the overhang portion 5 as shown in FIG. As a result, the vortex around the edge of the strip steel plate 4 is suppressed.

図５には、上述の実施例と比較例における帯状鋼板の板幅方向温度分布の測定結果を示す。この測定結果は、帯状鋼板の板幅が１０００ｍｍ、鋼板中央部温度が８９０℃の例である。また、実施例における張出部の張り出し量は１４０ｍｍである。   In FIG. 5, the measurement result of the plate width direction temperature distribution of the strip | belt-shaped steel plate in the above-mentioned Example and a comparative example is shown. This measurement result is an example in which the plate width of the strip-shaped steel plate is 1000 mm and the steel plate central portion temperature is 890 ° C. Further, the overhang amount of the overhang portion in the example is 140 mm.

図５に示すように、両側壁に張出部を設けていない比較例では帯状鋼板のエッジ部の過加熱量は４０℃に達したが、両側壁に張出部を設けた実施例では３０℃に抑えられており、本発明による帯状鋼板のエッジ部の過加熱量低減効果が確認できた。すなわち、両側壁に張出部を設けたことにより、先に図３に示したように帯状鋼板のエッジ部廻りの渦流が抑えられ、これによって帯状鋼板のエッジ部の過加熱を抑え得ることが確認された。   As shown in FIG. 5, in the comparative example in which the overhang portions are not provided on both side walls, the overheating amount of the edge portion of the strip steel plate reached 40 ° C., but in the example in which the overhang portions were provided on both side walls, It was suppressed to ° C., and the effect of reducing the amount of overheating of the edge part of the strip steel sheet according to the present invention was confirmed. That is, by providing the overhanging portions on both side walls, the eddy current around the edge portion of the strip steel plate can be suppressed as shown in FIG. 3, and this can suppress overheating of the edge portion of the strip steel plate. confirmed.

上記実施例において張出部の張り出し量は１４０ｍｍとしたが、設備の設置スペースに余裕が少ない場合には５０ｍｍ程度にし、設置スペースに余裕がある場合には２５０ｍｍ程度にする等、設置スペースを加味し、１４０ｍｍから増減できることは言うまでもない。また、張出部の形状も、両側壁に沿う高温ガス流の上下方向への移動を妨げ得る形状であれば、張出部を上下に２分割する等、形状は変更しても構わない。さらに、上記実施例では、横型の連続焼鈍炉に本発明を適用したが、縦型の連続焼鈍炉にも本発明を適用できることは言うまでもない。   In the above embodiment, the overhanging amount of the overhanging portion is 140 mm. However, when the installation space of the facility is small, it is about 50 mm, and when the installation space is enough, it is about 250 mm. Needless to say, it can be increased or decreased from 140 mm. Further, the shape of the overhanging portion may be changed, for example, by dividing the overhanging portion into two vertically as long as the shape of the hot gas flow along the both side walls can be prevented from moving in the vertical direction. Furthermore, in the said Example, although this invention was applied to the horizontal type continuous annealing furnace, it cannot be overemphasized that this invention is applicable also to a vertical type continuous annealing furnace.

本発明による連続焼鈍炉の実施例を示す要部の概略斜視図である。It is a schematic perspective view of the principal part which shows the Example of the continuous annealing furnace by this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 両側壁に張出部を設けた本発明の実施例における高温ガス流れの模式図である。It is a schematic diagram of the hot gas flow in the Example of this invention which provided the overhang | projection part in the both-sides wall. 両側壁に張出部を設けていない比較例における高温ガス流れの模式図である。It is a schematic diagram of the high temperature gas flow in the comparative example which does not provide the overhang | projection part in both side walls. 本発明の実施例と比較例における帯状鋼板の板幅方向温度分布の測定結果を示す。The measurement result of the plate width direction temperature distribution of the strip steel plate in the Example of this invention and a comparative example is shown. 火炎バーナを用いる無酸化炉方式による従来の連続焼鈍炉を示す断面図である。It is sectional drawing which shows the conventional continuous annealing furnace by the non-oxidation furnace system which uses a flame burner.

符号の説明Explanation of symbols

１ 上バーナ（火炎バーナ）
２ 下バーナ（火炎バーナ）
３ 側壁
４ 帯状鋼板
５ 張出部
６ 壁面冷却装置
７ 渦流
８ 板温度測定器 1 Upper burner (flame burner)
2 Lower burner (flame burner)
3 Side Wall 4 Strip Steel Plate 5 Overhang 6 Wall Cooling Device 7 Eddy Current 8 Plate Temperature Measuring Instrument

Claims (2)

火炎バーナを用いる無酸化炉方式による帯状鋼板の連続焼鈍炉において、走行する帯状鋼板のエッジ部と対向する連続焼鈍炉の両側壁のそれぞれに、帯状鋼板の走行方向に沿って火炎バーナを帯状鋼板の表面側と裏面側に交互に位置するように配置し、かつ、前記両側壁のそれぞれには、帯状鋼板のエッジ部と対向する位置を中心として帯状鋼板の走行方向と直交する方向に火炎バーナの配置位置以内の長さを有するとともに、炉内側に向けて５０〜２５０ｍｍの張り出し量を有し、かつ断面形状が矩形状で、帯状鋼板の走行方向に連続する張出部を設けたことを特徴とする連続焼鈍炉。 In a continuous annealing furnace for strip steel sheets by a non-oxidation furnace method using a flame burner, a flame burner is disposed on each side wall of the continuous annealing furnace facing the edge of the traveling strip steel sheet along the traveling direction of the strip steel sheet. The flame burners are arranged so as to be alternately positioned on the front surface side and the back surface side, and in each of the both side walls in a direction perpendicular to the running direction of the strip steel plate, centering on the position facing the edge of the strip steel plate A projecting portion having a length of 50 mm to 250 mm toward the inside of the furnace and having a rectangular cross-sectional shape and continuous in the running direction of the strip steel plate. Features a continuous annealing furnace. 張出部を上下に２分割して設けた請求項１に記載の連続焼鈍炉。  The continuous annealing furnace according to claim 1, wherein the overhang portion is divided into two parts in the vertical direction.
JP2004294159A 2004-10-06 2004-10-06 Continuous annealing furnace Expired - Fee Related JP4482417B2 (en)

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