JP2000088465A - Continuously heating furnace and method for continuously heating - Google Patents
Continuously heating furnace and method for continuously heatingInfo
- Publication number
- JP2000088465A JP2000088465A JP10260087A JP26008798A JP2000088465A JP 2000088465 A JP2000088465 A JP 2000088465A JP 10260087 A JP10260087 A JP 10260087A JP 26008798 A JP26008798 A JP 26008798A JP 2000088465 A JP2000088465 A JP 2000088465A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- furnace
- heat transfer
- temperature
- slab
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Tunnel Furnaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、例えば熱間圧延に供す
るスラブ等の被加熱材を加熱するための加熱炉および加
熱方法に係り、特に加熱目標温度など昇温パターンが異
なった被加熱材を連続装入して加熱するための連続加熱
炉および連続加熱方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating furnace and a heating method for heating a material to be heated such as a slab to be subjected to hot rolling, and more particularly to a material to be heated having different heating patterns such as a target heating temperature. The present invention relates to a continuous heating furnace and a continuous heating method for continuously charging and heating.
【0002】[0002]
【従来の技術】熱間圧延に供されるスラブ等の被加熱材
を加熱するためにはウオーキングビーム式の連続加熱炉
が多く用いられる。図8に示すように、この加熱炉2は
被加熱材の装入口7から抽出口8に向かって、予熱帯
3、第1加熱帯4、第2加熱帯5、均熱帯6に区分さ
れ、装入口7から装入された被加熱材1は、図9に示す
ように、固定ビーム10の上に載置され、ウオーキング
ビーム9によりSの方向に搬送されながら加熱されるよ
うになっている。2. Description of the Related Art In order to heat a material to be heated such as a slab to be subjected to hot rolling, a continuous heating furnace of a walking beam type is often used. As shown in FIG. 8, the heating furnace 2 is divided into a pre-tropical zone 3, a first heating zone 4, a second heating zone 5, and a solitary zone 6 from a charging port 7 for a material to be heated toward an extraction port 8. As shown in FIG. 9, the material to be heated 1 charged from the charging port 7 is placed on a fixed beam 10 and heated while being conveyed in the direction of S by the walking beam 9. .
【0003】かかる構成の加熱炉2においては、前記第
1加熱帯4、第2加熱帯5、均熱帯6の側面にバーナ
(図示しない)が設けられ、炉天井12、炉底13、炉
側壁20が高温に加熱され、そこからの輻射熱によって
被加熱材が加熱されるようになっている。この種の加熱
炉では、炉内の熱容量が大きいため炉温を急激に変化さ
せることは困難である。そのため、装入計画を立てるに
当たっては極力同一操炉条件が満たされるようにし、目
標加熱温度が比較的高いもの(高温加熱材)の次に目標
か滅温度が低いもの(低温加熱温度材)その次に目標加
熱温度が最も低いもの)極低温加熱温度材)を装入する
など操炉条件がなだらかに変化するようにしている。In the heating furnace 2 having such a configuration, a burner (not shown) is provided on the side of the first heating zone 4, the second heating zone 5, and the leveling zone 6, and the furnace ceiling 12, the furnace bottom 13, and the furnace side wall are provided. 20 is heated to a high temperature, and the material to be heated is heated by radiant heat therefrom. In this type of heating furnace, it is difficult to rapidly change the furnace temperature because the heat capacity in the furnace is large. Therefore, when making a charging plan, make sure that the same furnace operating conditions are satisfied as much as possible, and set the target heating temperature relatively high (high-temperature heating material) followed by the target cooling temperature low (low-temperature heating temperature material). Next, the furnace operating conditions are smoothly changed, for example, by charging a material having the lowest target heating temperature (a material having a very low heating temperature).
【0004】しかしながら、互いに隣接する素材の加熱
温度が異なるときには、例えば図8に示すように高温加
熱材1aに続いて低温加熱材1bが装入されるときに
は、高温加熱材の加熱温度を確保するように炉内の温度
を設定すると、高温加熱材と隣接する低温加熱材が過加
熱になり、抽出温度が管理目標値よりも高くなり、その
まま圧延すると品質の劣化が生ずる。However, when the heating temperatures of the materials adjacent to each other are different, for example, when the low-temperature heating material 1b is inserted after the high-temperature heating material 1a as shown in FIG. 8, the heating temperature of the high-temperature heating material is secured. When the temperature in the furnace is set as described above, the low-temperature heating material adjacent to the high-temperature heating material is overheated, and the extraction temperature becomes higher than the control target value.
【0005】かかる問題に対処するために、従来は、
過加熱材を仕上圧延機の入側で所定温度に低下するまで
待機させ、仕上げ圧延温度を目標温度に一致させる手
段、高温加熱材と低温加熱材との間に一定の間隔(以
下、空炉という)を置く手段、あるいは、炉内に燃焼
に必要な空気量以上の空気を投入し、炉内の低温加熱材
に対応する位置の炉温を低下させる手段等が採られ、低
温加熱材のための圧延温度を確保し、あるいは炉内にお
いて必要な昇温パターンを実現できるようにしていた。In order to deal with such a problem, conventionally,
A means for making the overheated material stand by at the entrance side of the finishing mill until the temperature is lowered to a predetermined temperature, a means for matching the finish rolling temperature to the target temperature, and a fixed interval between the high-temperature heated material and the low-temperature heated material (hereinafter, an empty furnace Means to put the air in the furnace over the amount of air necessary for combustion, and to lower the furnace temperature at the position corresponding to the low-temperature heating material in the furnace. To ensure a necessary rolling temperature, or to achieve a required heating pattern in the furnace.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、の手
段によるときは、待機のための圧延停止のため圧延能率
が低下するという問題が避けられず、また、の手段に
よるときは、空炉の後の装入材の均熱時間を確保するた
めの時間待ちが生じ、圧延能率が低下するという問題が
あった。さらに、の手段によるときは、炉内の酸素濃
度が増大してスケール量が増加し、素材歩留まりが悪化
したり、被加熱材表面の粒界酸化のため、表面品質が悪
化するという問題があった。However, in the case of using the means, the problem that the rolling efficiency is reduced due to the stoppage of the rolling for standby is inevitable. There is a problem that a waiting time for securing the soaking time of the charged material occurs, and the rolling efficiency is reduced. Further, when the above method is used, there is a problem that the oxygen concentration in the furnace increases, the scale amount increases, the material yield deteriorates, and the surface quality deteriorates due to grain boundary oxidation of the surface of the material to be heated. Was.
【0007】本発明は、このような従来の加熱炉の有す
る問題点を解決することを目的としてなされたもので、
前記低温加熱材の過加熱、加熱時間待ちによる圧延能率
の低下、あるいはスケール発生に伴う歩留まりや品質の
悪化という問題点を解決する加熱炉および加熱方法を提
供することを目的とするSUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the conventional heating furnace.
An object of the present invention is to provide a heating furnace and a heating method that solve the problems of overheating of the low-temperature heating material, reduction in rolling efficiency due to waiting for heating time, or deterioration in yield and quality due to scale generation.
【0008】[0008]
【課題解決のための手段】上記の課題を解決するため、
被加熱材を炉長方向に搬送しながら加熱することが可能
な連続加熱炉において、該連続加熱炉を炉内の被加熱材
通路の上側および下側に前記連続加熱炉の炉長方向およ
び炉幅方向に配列した板状体からなる伝熱抑止板と、該
伝熱抑止板を単独あるいは群として前記被加熱材に接近
あるいは離反可能とする伝熱抑止板の昇降装置とを有す
ることとするものである。Means for Solving the Problems To solve the above problems,
A continuous heating furnace capable of heating a material to be heated while being conveyed in the furnace length direction, wherein the continuous heating furnace is placed above and below a heated material passage in the furnace in the furnace length direction of the continuous heating furnace and the furnace. It has a heat transfer suppression plate made of a plate-like body arranged in the width direction, and a heat transfer suppression plate elevating device that enables the heat transfer suppression plate to approach or separate from the material to be heated, alone or as a group. Things.
【0009】また、上記の連続加熱炉を用いた連続加熱
方法として、被加熱材の予定昇温パターンに合わせるよ
うに加熱材の燃焼条件を制御するとともに、前記伝熱抑
止板を前記鋼片に接近あるいは離反させて被加熱材の昇
温パターンを前記予定昇温パターンに近づけることとす
るものである。Further, as a continuous heating method using the above continuous heating furnace, the heating condition of the heating material is controlled so as to match a predetermined heating pattern of the material to be heated, and the heat transfer suppressing plate is attached to the steel slab. The heating pattern of the material to be heated is made to approach or separate from the predetermined heating pattern by approaching or separating.
【0010】[0010]
【発明の実施の形態】以下、本発明の実施形態を加熱温
度の異なる被加熱材としてスラブを連続加熱する場合を
例にとって具体的に説明する。図1に示すように本発明
が適用される連続加熱炉2は、通常の連続加熱炉と同様
に、スラブ1の装入口7側から抽出口8側に向かって、
予熱帯3、第1加熱帯4、第2加熱帯5、均熱帯6に区
分されており、スラブ1を支持するための、固定ビーム
10、スラブ1を搬送するためのウオーキングビーム9
が設けられている。加えて、本発明においては、上記連
続加熱炉2において伝熱抑止板およびその昇降装置を含
む伝熱抑止装置11が第1加熱帯4、第2加熱帯5およ
び均熱帯6に設置されている。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described with reference to an example in which a slab is continuously heated as a material to be heated having different heating temperatures. As shown in FIG. 1, the continuous heating furnace 2 to which the present invention is applied is similar to a normal continuous heating furnace, in which the slab 1 is moved from the charging inlet 7 side to the extraction port 8 side.
It is divided into a pre-tropical zone 3, a first heating zone 4, a second heating zone 5, and a solitary zone 6, and has a fixed beam 10 for supporting the slab 1 and a walking beam 9 for conveying the slab 1.
Is provided. In addition, in the present invention, in the continuous heating furnace 2, the heat transfer suppression device 11 including the heat transfer suppression plate and the elevating device is installed in the first heating zone 4, the second heating zone 5, and the soaking zone 6. .
【0011】伝熱抑止装置11はスラブ1の上面に対向
するように炉長方向に複数に配列された上部伝熱抑止装
置11uと、スラブ1の下面に対向するように炉長方向
および炉幅方向に複数に配列された下部伝熱抑止装置1
1bに分かれている。すなわち被圧延材であるスラブ1
の通路を挟んで上下に伝熱抑止装置が設けられている。The heat transfer suppression device 11 includes a plurality of upper heat transfer suppression devices 11 u arranged in the furnace length direction so as to face the upper surface of the slab 1, and the furnace length direction and the furnace width so as to face the lower surface of the slab 1. Heat transfer suppression devices 1 arranged in a plurality in the direction
1b. That is, the slab 1 which is the material to be rolled
A heat transfer suppression device is provided vertically above and below the passage.
【0012】スラブ通路の下側に設けられて下部伝熱抑
止装置11bの構造は、図3に示すように炉長方向(図
3中矢印Lの方向)に長さをもった伝熱抑止板14、該
伝熱抑止板14の支持棒15、および支持棒15に接続
された伝熱抑止板14の昇降手段16とからなる。支持
棒15は、炉底13を貫通して、炉外に設置された昇降
手段16と接続されており、該昇降手段16が支持棒1
5を上下動させることにより、伝熱抑止板14のスラブ
1への接近および離反が可能となっている。The structure of the lower heat transfer suppressing device 11b provided below the slab passage has a heat transfer suppressing plate having a length in the furnace length direction (the direction of arrow L in FIG. 3) as shown in FIG. 14, a support rod 15 for the heat transfer suppression plate 14 and a lifting means 16 for the heat transfer suppression plate 14 connected to the support rod 15. The support rod 15 penetrates through the furnace bottom 13 and is connected to elevating means 16 installed outside the furnace.
By moving up and down 5, the heat transfer suppressing plate 14 can approach and separate from the slab 1.
【0013】伝熱抑止板14および支持棒15の内部に
は冷却配管(図示しない)が設けられており、伝熱抑止
板を炉内温度より低温に保ち、炉壁からの輻射熱が被加
熱材であるスラブ1に伝わるのを遮ることができ、伝熱
抑止板14をスラブ1に接近させることにより、スラブ
1の昇温を抑制することができる。A cooling pipe (not shown) is provided inside the heat transfer suppressing plate 14 and the support rod 15 to keep the heat transfer suppressing plate at a temperature lower than the furnace temperature. Can be blocked from being transmitted to the slab 1, and the temperature rise of the slab 1 can be suppressed by bringing the heat transfer suppressing plate 14 close to the slab 1.
【0014】上記のような構造を有する下部伝熱抑止装
置11bは、図3に示すように、ウオーキングビーム9
と固定ビーム10との間の位置に、炉長方向(図3の矢
印L方向)および炉幅方向(図3の矢印W方向)に複数
配置される。したがって炉内をスラブが搬送されるのに
応じて任意のスラブに対して、上記伝熱抑止装置11b
の伝熱抑止板14を接近あるいは離反させることが可能
になり、それにより低温加熱材への伝熱を制限すること
が可能になる。なお、スラブ上面に設置される上部伝熱
抑止装置11uも、下部伝熱抑止装置11bと同様の構
造を有し、炉長方向および炉幅方向に複数配列される。As shown in FIG. 3, the lower heat transfer suppressing device 11b having the above structure
A plurality of furnaces are arranged in a furnace length direction (arrow L direction in FIG. 3) and a furnace width direction (arrow W direction in FIG. 3) between the furnace and the fixed beam 10. Therefore, as the slab is conveyed in the furnace, the heat transfer suppressing device 11b
Can be made to approach or move away from each other, thereby limiting heat transfer to the low-temperature heating material. The upper heat transfer suppression device 11u installed on the upper surface of the slab has the same structure as the lower heat transfer suppression device 11b, and is arranged in a plurality in the furnace length direction and the furnace width direction.
【0015】以下、上記伝熱抑止装置を有する本発明の
加熱炉によるスラブの加熱方法について説明する。高温
加熱材1aに続いて低温加熱材1bが連続して装入され
た場合、本発明においては、図1に示すように、低温加
熱材1bに相当する位置に亘って伝熱板(11u、11
b)をスラブ1に接近させるようにする。すなわち、低
温加熱材1bが炉長方向に沿って搬送されるのにしたが
って、低温加熱材1bを追尾しながらその搬送方向上流
側から下流方向に向けて順次伝熱抑止板を低温加熱材1
bに接近させていくのである。この場合、特に高温加熱
材1aの直後に装入される低温加熱材1b1に対して確
実に伝熱抑止板14が接近できるようにすることが重要
であり、それ以降は燃焼制御の状況に応じてその位置を
制御することができる。Hereinafter, a method of heating a slab by the heating furnace of the present invention having the above-described heat transfer suppressing device will be described. When the low-temperature heating material 1b is continuously loaded after the high-temperature heating material 1a, in the present invention, as shown in FIG. 1, the heat transfer plates (11u, 11u, 11
b) is brought closer to the slab 1. That is, as the low-temperature heating material 1b is conveyed along the furnace length direction, the heat transfer suppressing plates are sequentially moved from the upstream side to the downstream direction in the conveying direction while tracking the low-temperature heating material 1b.
b. In this case, it is important to Ensuring close heat transfer suppressing plate 14 relative to the low temperature heating material 1b 1 which is charged immediately, especially high-temperature heating member 1a, thereafter the state of the combustion control The position can be controlled accordingly.
【0016】換言すれば、高温加熱材1aは伝熱抑止板
14から離れた状態で加熱され、一方低温加熱材1bは
伝熱抑止板14によりカバーされた状態で加熱されるこ
とになる。したがって、最後の高温加熱材1a3に続い
て装入された低温加熱材1b1が装入された場合であっ
ても、低温加熱材1b1は常に伝熱抑止板14が接近し
た状態で加熱され、低温加熱材としてに必要な昇温パタ
ーンを得ることができる。In other words, the high-temperature heating material 1a is heated while being away from the heat transfer suppressing plate 14, while the low-temperature heating material 1b is heated while being covered by the heat transfer suppressing plate 14. Therefore, even when the low-temperature heating member 1b 1 which is charged following the end of high temperature heating member 1a 3 is charged, heated while low temperature heating material 1b 1 is to always close the heat transfer suppressing plate 14 As a result, it is possible to obtain a heating pattern required as a low-temperature heating material.
【0017】本発明に従う伝熱抑止装置11を有する加
熱炉の制御は、例えば図4に示す加熱制御システムによ
り行うのが望ましい。このシステムは、連続加熱炉内の
各加熱帯の設定温度をスラブの予定ヒートパターンにし
たがって計算する炉内温度設定計算部101と、該炉内
温度設定計算部101により求められた設定温度が各加
熱帯において達成されるようにバーナへのガス、空気の
流量をコントロールするとともに伝熱抑止板の14の位
置を制御する燃焼制御部102からなる。The control of the heating furnace having the heat transfer suppressing device 11 according to the present invention is desirably performed by, for example, a heating control system shown in FIG. This system includes an in-furnace temperature setting calculating unit 101 that calculates a set temperature of each heating zone in a continuous heating furnace according to a scheduled heat pattern of a slab, and a set temperature obtained by the in-furnace temperature setting calculating unit 101. It comprises a combustion control unit 102 which controls the flow of gas and air to the burners as well as controls the position of the heat transfer suppression plate 14 as achieved in the heating zone.
【0018】上記炉内温度設定計算部101は炉内トラ
ッキング情報発信部101a、加熱スラブのヒートパタ
ーン作成部101b、燃焼、伝熱抑止板高さ計算部10
1cからなる。炉内トラッキング情報発信部101a
は、加熱されているスラブの現在位置を監視するととも
に、トラッキング情報に基づき炉内におけるスラブ1の
進行を予測する。ヒートパターン作成部101bは、加
熱されている各スラブの現在温度を求め、その温度と前
記炉内トラッキング情報発信部101aより求めたスラ
ブの進行状況(現在位置および進行予測結果を含
む。)、および、スラブの加熱目標温度に基づき、加熱
スラブのヒートパターンを作成する。The in-furnace temperature setting calculation unit 101 includes an in-furnace tracking information transmission unit 101a, a heating slab heat pattern creation unit 101b, a combustion and heat transfer suppression plate height calculation unit 10
1c. Furnace tracking information transmission unit 101a
Monitors the current position of the slab being heated and predicts the progress of the slab 1 in the furnace based on the tracking information. The heat pattern creation unit 101b obtains the current temperature of each slab being heated, the temperature and the progress of the slab obtained by the in-furnace tracking information transmission unit 101a (including the current position and the progress prediction result), and Then, a heat pattern of the heated slab is created based on the target heating temperature of the slab.
【0019】燃焼、伝熱抑止板高さ計算部101cは、
上記炉内トラッキング情報発信部101aおよびヒート
パターン作成部101bからの情報に基づき、スラブの
ヒートパターンが変更されるのに伴い、特に、例えば高
温加熱材から低温加熱材にヒートパターンが変更される
のに伴い、何れのスラブにおいても所望の加熱温度が得
られるように燃焼条件および伝熱抑止板の高さを設定す
る。The combustion and heat transfer suppression plate height calculation unit 101c
As the heat pattern of the slab is changed based on the information from the in-furnace tracking information transmitting unit 101a and the heat pattern creating unit 101b, particularly, for example, the heat pattern is changed from a high-temperature heating material to a low-temperature heating material. Accordingly, the combustion conditions and the height of the heat transfer suppression plate are set so that a desired heating temperature is obtained in any slab.
【0020】燃焼制御部102は、炉内温度設定計算部
101により求められた条件に基づき、各加熱帯の燃焼
条件を制御し、かつ伝熱抑止板の高さを制御する。すな
わち、各加熱帯の温度を炉側壁に設置されたバーナへの
ガスおよび空気の供給量を制御することによって目標値
に維持し、かつ、伝熱抑止板の高さを制御することによ
って、ヒートパターンが異なるスラブの接続部において
スラブの温度を目標値とする。具体的には、バーナへの
ガス供給管および空気供給管に流量調整弁が設けられて
いて(図示省略)、該流量調整弁に対して開度設定信号
を送るとともに、前記伝熱抑止装置の昇降システムに対
して伝熱抑止板の高さ設定信号を送る。The combustion control unit 102 controls the combustion conditions of each heating zone and controls the height of the heat transfer suppression plate based on the conditions obtained by the furnace temperature setting calculation unit 101. That is, the temperature of each heating zone is maintained at a target value by controlling the amount of gas and air supplied to a burner installed on the furnace side wall, and the heat is controlled by controlling the height of the heat transfer suppressing plate. The target temperature is the temperature of the slab at the connection between the slabs having different patterns. Specifically, a flow control valve is provided in a gas supply pipe and an air supply pipe to the burner (not shown), and an opening degree setting signal is sent to the flow control valve. The height setting signal of the heat transfer suppression plate is sent to the lifting system.
【0021】以上説明した加熱制御システムにより、ヒ
ートパターンが異なるスラブが連続して装入されたとき
に、マクロ的には各加熱スラブのヒートパターンに従う
燃焼制御を行うとともに、、ヒートパターンが異なるス
ラブの接続部においては伝熱抑止板の高さを変更するこ
とにより、例えば高温加熱材と連続して装入された低温
加熱材の過加熱を防止できる。With the heating control system described above, when slabs having different heat patterns are successively loaded, macroscopic combustion control is performed in accordance with the heat patterns of the respective heating slabs, and slabs having different heat patterns are used. By changing the height of the heat transfer suppressing plate at the connection portion, it is possible to prevent, for example, overheating of the low-temperature heating material inserted continuously with the high-temperature heating material.
【0022】なお、上記実施の形態では、高温加熱材か
ら低温加熱材に移行する際の接続部に関して本発明を適
用する例について説明したが、本発明はこれに限らず加
熱目標温度が異なるスラブの接続部について適用でき
る。また、必ずしも図4に示す加熱制御システムを用い
ずとも、予め被加熱材であるスラブの加熱目標温度に対
して伝熱抑止板の高さを設定しておき、これにより操業
することも可能である。In the above-described embodiment, an example is described in which the present invention is applied to the connection portion when transitioning from a high-temperature heating material to a low-temperature heating material. However, the present invention is not limited to this, and the present invention is not limited to this. Can be applied to the connection part. Also, without necessarily using the heating control system shown in FIG. 4, it is possible to set the height of the heat transfer suppression plate in advance with respect to the heating target temperature of the slab as the material to be heated, and to operate with this. is there.
【0023】なお、図3には、伝熱抑止装置として、伝
熱抑止板14毎に支持棒15、昇降手段16を設けた例
を示したが、本発明はこれに限らず、図5に示すように
炉幅方向(矢印Wの方向)に複数配列した伝熱抑止板1
4を一つの支持棒15で支持するようにして、昇降装置
16の数を減らすようにしてもよい。この場合、スラブ
下面への伝熱を制御する伝熱抑止装置11bについて
は、図6に示すようにウオーキングビーム9や固定ビー
ム10と干渉しないように配慮すべきである。FIG. 3 shows an example in which a support rod 15 and an elevating means 16 are provided for each heat transfer suppressing plate 14 as a heat transfer suppressing device. However, the present invention is not limited to this, and FIG. As shown, a plurality of heat transfer suppressing plates 1 arranged in the furnace width direction (direction of arrow W)
4 may be supported by one support rod 15 to reduce the number of elevating devices 16. In this case, the heat transfer suppressing device 11b for controlling the heat transfer to the lower surface of the slab should take care not to interfere with the walking beam 9 and the fixed beam 10 as shown in FIG.
【0024】[0024]
【実施例】本発明装置を利用して高温加熱材(抽出目標
温度1200℃)10本、低温加熱材(抽出目標温度1050℃)
10本、極低温加熱材(抽出目標温度950℃)6本を順番に
連続して加熱炉に装入し、2分ピッチで抽出するという
操業を行った。その結果得られたスラブ抽出温度実績
を、従来の加熱方法により加熱した場合と比較して図7
に示した。[Embodiment] Using the apparatus of the present invention, 10 high-temperature heating materials (target extraction temperature 1200 ° C) and low-temperature heating materials (target extraction temperature 1050 ° C)
An operation was performed in which 10 pieces and 6 pieces of cryogenic heating material (target extraction temperature: 950 ° C.) were successively charged into a heating furnace and extracted at a 2-minute pitch. The slab extraction temperature results obtained as compared with the case of heating by the conventional heating method are shown in FIG.
It was shown to.
【0025】図7より明らかなように、本発明法を適用
した場合は、高温加熱材と低温加熱材と接続部、および
低温加熱材と極低温加熱材との接続部、および、極低温
加熱材と低温加熱材の接続部においても、抽出目標温度
に加熱されていることが分かる。これに対し、従来法に
よる場合は、11〜13番目に抽出された低温加熱材は、10
番目までのスラブが高温加熱材であったために、抽出温
度が目標温度よりも高くなってしまい、また、21番目お
よび22番目に抽出された極低温材は、20番目に抽出され
たスラブが低温加熱材であったために、抽出温度が目標
温度より高くなっている。さらに、29番目および30番目
に抽出された極低温加熱材は、次材が低温加熱材である
ため、低温加熱材の抽出目標温度を達成できるように炉
温設定しなければならず、結果として目標より高い温度
に加熱される。As is apparent from FIG. 7, when the method of the present invention is applied, the connection between the high-temperature heating material and the low-temperature heating material, the connection between the low-temperature heating material and the cryogenic heating material, and the cryogenic heating It can be seen that the connection between the material and the low-temperature heating material is also heated to the extraction target temperature. In contrast, according to the conventional method, the 11th to 13th extracted low-temperature heating materials
Since the slabs up to the 番 目 th were high-temperature heating materials, the extraction temperature was higher than the target temperature, and the cryogenic materials extracted at the 21st and 22nd were the slabs extracted at the 20th Because of the heating material, the extraction temperature is higher than the target temperature. Furthermore, since the next material is the low-temperature heating material, the furnace temperature of the 29th and 30th extracted cryogenic heating materials must be set so as to achieve the extraction target temperature of the low-temperature heating material. Heated above target temperature.
【0026】[0026]
【発明の効果】本発明は上記のように構成したから、ヒ
ートパターンが異なるスラブが連続して装入されたと
き、加熱される被加熱材(スラブ)の加熱温度に応じ伝
熱量を調整できるので、スラブの焼き過ぎ、仕上側圧延
機入口における圧延待機を防止でき、また、空炉をとる
必要性もない。さらに、余分の冷却空気吹き込みなどに
よるスケールロスも発生することがなく、製品の表面品
質も向上する。According to the present invention, as described above, when slabs having different heat patterns are continuously loaded, the amount of heat transfer can be adjusted according to the heating temperature of the material to be heated (slab). Therefore, it is possible to prevent oversintering of the slab and waiting for rolling at the entrance of the finishing mill, and it is not necessary to use an empty furnace. Further, there is no occurrence of scale loss due to excessive blowing of cooling air, and the surface quality of the product is improved.
【図1】本発明に係る連続加熱炉の縦面断面である。FIG. 1 is a longitudinal sectional view of a continuous heating furnace according to the present invention.
【図2】本発明に係る連続加熱炉の横断面図(図1にお
けるA−A断面図)である。FIG. 2 is a transverse sectional view of the continuous heating furnace according to the present invention (a sectional view taken along line AA in FIG. 1).
【図3】下部伝熱抑止装置11bの詳細構造を示す斜視
図である。FIG. 3 is a perspective view showing a detailed structure of a lower heat transfer suppression device 11b.
【図4】本発明に利用する加熱制御システムの構成を示
す制御系統図である。FIG. 4 is a control system diagram showing a configuration of a heating control system used in the present invention.
【図5】本発明に用いる伝熱抑止装置の1変形例の斜視
図である。FIG. 5 is a perspective view of a modification of the heat transfer suppression device used in the present invention.
【図6】本発明に用いる伝熱抑止装置の1変形例の炉内
配置図である。FIG. 6 is a furnace layout diagram of a modified example of the heat transfer suppressing device used in the present invention.
【図7】本発明適用例と従来例におけるスラブ抽出温度
の時系列変化図である。FIG. 7 is a time-series change diagram of a slab extraction temperature in an application example of the present invention and a conventional example.
【図8】従来の連続加熱炉の縦断面図である。FIG. 8 is a longitudinal sectional view of a conventional continuous heating furnace.
【図9】従来の連続加熱炉の横断面図(図8におけるB
−B断面図)である。FIG. 9 is a cross-sectional view of a conventional continuous heating furnace (B in FIG. 8).
-B sectional view).
1:スラブ、1a:高温加熱材、1b:低温加熱材 2:連続加熱炉 3:予熱帯 4:第1加熱帯 5:第2加熱帯 6:均熱帯 7:装入口 8:抽出口 9:ウオーキングビーム 10:固定ビーム 11:伝熱抑止装置、11u:上側伝熱抑止装置、11
b:下側伝熱抑止装置 12:炉天井 13:炉底 14:伝熱抑止板 15:支持棒 16:昇降手段 20:炉側壁 101:炉内温度設定計算部 101a:炉内トラッキング情報発信部 101b:ヒートパターン作成部 101c:炉温、伝熱抑止板高さ計算部 102:燃焼制御部1: Slab, 1a: High temperature heating material, 1b: Low temperature heating material 2: Continuous heating furnace 3: Pre-tropical zone 4: First heating zone 5: Second heating zone 6: Uniform tropical zone 7: Inlet 8: Extraction port 9: Walking beam 10: Fixed beam 11: Heat transfer suppression device, 11u: Upper heat transfer suppression device, 11
b: Lower heat transfer suppression device 12: Furnace ceiling 13: Furnace bottom 14: Heat transfer suppression plate 15: Support rod 16: Elevating means 20: Furnace side wall 101: Furnace temperature setting calculation unit 101a: Furnace tracking information transmission unit 101b: Heat pattern creation unit 101c: Furnace temperature, heat transfer suppression plate height calculation unit 102: Combustion control unit
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 4K034 AA02 AA03 AA19 BA05 BA08 CA01 DA05 DA06 DB02 DB03 DB04 EA05 EA15 GA04 4K050 AA01 BA02 CD13 CG13 EA02 EA04 EA05 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4K034 AA02 AA03 AA19 BA05 BA08 CA01 DA05 DA06 DB02 DB03 DB04 EA05 EA15 GA04 4K050 AA01 BA02 CD13 CG13 EA02 EA04 EA05
Claims (2)
することが可能な連続加熱炉において、 炉内の被加熱材通路の上側および下側に前記連続加熱炉
の炉長方向および炉幅方向に配列した板状体からなる伝
熱抑止板と、該伝熱抑止板を単独あるいは群として前記
被加熱材に接近あるいは離反可能とする伝熱抑止板の昇
降装置とを有することを特徴とする連続加熱炉。1. A continuous heating furnace capable of heating a material to be heated while being conveyed in the furnace length direction, wherein the furnace and the furnace are arranged above and below a passage of the material to be heated in the furnace. It is characterized by having a heat transfer suppression plate made of a plate-like body arranged in the width direction, and a heat transfer suppression plate elevating device that enables the heat transfer suppression plate to approach or separate from the material to be heated, alone or as a group. And a continuous heating furnace.
続加熱方法であって、被加熱材の予定昇温パターンに合
わせるように加熱材の燃焼条件を制御するとともに、前
記伝熱抑止板を前記被加熱材に接近あるいは離反させて
被加熱材の昇温パターンを前記予定昇温パターンに近づ
けることを特徴とする連続加熱方法。2. A continuous heating method using the continuous heating furnace according to claim 1, wherein a combustion condition of the heating material is controlled so as to match a predetermined heating pattern of the material to be heated, and the heat transfer is suppressed. A continuous heating method, wherein a heating pattern of the material to be heated is brought close to the predetermined heating pattern by moving a plate toward or away from the material to be heated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10260087A JP2000088465A (en) | 1998-09-14 | 1998-09-14 | Continuously heating furnace and method for continuously heating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10260087A JP2000088465A (en) | 1998-09-14 | 1998-09-14 | Continuously heating furnace and method for continuously heating |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000088465A true JP2000088465A (en) | 2000-03-31 |
Family
ID=17343128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10260087A Pending JP2000088465A (en) | 1998-09-14 | 1998-09-14 | Continuously heating furnace and method for continuously heating |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000088465A (en) |
-
1998
- 1998-09-14 JP JP10260087A patent/JP2000088465A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
RU2128717C1 (en) | Aggregate for making stainless steel strip | |
US10619924B2 (en) | Method for controlling a metal strip in a heat treatment furnace | |
CA1270427A (en) | Heat treatment of steel elements in fluidized beds | |
CA1219748A (en) | Method and walking beam furnace for the intermediate heating pipes in hot rolling mills | |
JP5181803B2 (en) | Heating method of heated material | |
JP2002318076A (en) | High temperature protection atmosphere heat treat furnace | |
JP2000088465A (en) | Continuously heating furnace and method for continuously heating | |
US4556385A (en) | Furnace with refractory beams | |
GB2064594A (en) | Method and apparatus for cooling hot-rolled wire rods | |
JP3845143B2 (en) | Continuous heating method and apparatus | |
JP2002213879A (en) | Atmosphere control method for heating furnace, and the heating furnace | |
JP3419917B2 (en) | Continuous heating device | |
JPH0929395A (en) | Manufacture of stainless steel strip by continuous casting hot rolling and heat treatment furnace therefor | |
JP2000212645A (en) | Continuous heating of steel material | |
US3453708A (en) | Continuous pottery kiln with slidable stretchers | |
JP3814007B2 (en) | Continuous heating method and apparatus | |
KR20100047006A (en) | A method and a skid apparatus for reducing temperature difference in a heating furnace | |
JP4670715B2 (en) | Sorting method of objects to be heated in continuous heating furnace group | |
KR100458263B1 (en) | walking beam type furnace | |
US3495309A (en) | Continuous kiln with varying temperature zones | |
JPH07115053B2 (en) | Hot rolling equipment | |
KR100451823B1 (en) | Slow Cooling Method For Hot Rolled Wire Rod | |
JPH11279649A (en) | Device and method for heating steel slab | |
US3379423A (en) | Hearth firing apparatus | |
JPH0331765B2 (en) |