JP2006104535A - Continuous annealing furnace - Google Patents
Continuous annealing furnace Download PDFInfo
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- JP2006104535A JP2006104535A JP2004294159A JP2004294159A JP2006104535A JP 2006104535 A JP2006104535 A JP 2006104535A JP 2004294159 A JP2004294159 A JP 2004294159A JP 2004294159 A JP2004294159 A JP 2004294159A JP 2006104535 A JP2006104535 A JP 2006104535A
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- 238000000137 annealing Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 7
- 230000000593 degrading effect Effects 0.000 abstract 1
- 238000013021 overheating Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007747 plating Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000007634 remodeling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
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
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。
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
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に帯状鋼板の走行方向に沿って、炉内側に向けて張り出す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 steel plate, and the both side walls of the strip steel plate are located at positions facing the edge portions of the strip steel plate. An overhanging portion that protrudes toward the inside of the furnace along the traveling direction 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
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 |
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
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
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
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.
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
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KR101150375B1 (en) * | 2008-09-30 | 2012-06-11 | 주식회사 에스에이씨 | Bright annealin gfurnace including heating furnace and bright annealing method with the annealing furnace |
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KR101150375B1 (en) * | 2008-09-30 | 2012-06-11 | 주식회사 에스에이씨 | Bright annealin gfurnace including heating furnace and bright annealing method with the annealing furnace |
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