JPH07242953A - Method and device for controlling autocombustion in continuous type heating furnace - Google Patents
Method and device for controlling autocombustion in continuous type heating furnaceInfo
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- JPH07242953A JPH07242953A JP3554894A JP3554894A JPH07242953A JP H07242953 A JPH07242953 A JP H07242953A JP 3554894 A JP3554894 A JP 3554894A JP 3554894 A JP3554894 A JP 3554894A JP H07242953 A JPH07242953 A JP H07242953A
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- time
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、連続式加熱炉の自動燃
焼制御装置および方法に係わり、特に、炉内被加熱物に
対して、最低在炉時間に基づいた抽出ピッチを適切に設
定することにより、安定した搬送スケジュ−ルと精度の
よい燃焼制御を実現し、低燃料原単位で連続式加熱炉の
操業が行なえるようにした新規な装置及び方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic combustion control system and method for a continuous heating furnace, and more particularly, it appropriately sets an extraction pitch based on the minimum in-furnace time for a material to be heated in the furnace. As a result, the present invention relates to a novel apparatus and method for realizing a stable transfer schedule and accurate combustion control, and enabling operation of a continuous heating furnace with a low fuel consumption rate.
【０００２】[0002]
【従来の技術】連続式加熱炉内の被加熱物の加熱状態
は、炉内の雰囲気温度と被加熱物の在炉時間により決め
られるので、連続式加熱炉の自動燃焼制御では、炉内の
雰囲気温度の他に、被加熱物の在炉時間を制御する必要
がある。炉内の雰囲気温度が同じ場合、在炉時間が長す
ぎると、被加熱物の内部の温度分布は均一となるが、燃
料を多く消費する事になるので燃料原単位が増大する。2. Description of the Related Art Since the heating state of an object to be heated in a continuous heating furnace is determined by the atmospheric temperature in the furnace and the time the object is in the furnace, the automatic combustion control of the continuous heating furnace requires In addition to the ambient temperature, it is necessary to control the in-furnace time of the object to be heated. When the atmosphere temperature in the furnace is the same and the temperature in the furnace is too long, the temperature distribution inside the object to be heated becomes uniform, but a large amount of fuel is consumed and the fuel consumption rate increases.
【０００３】従って、在炉時間は、被加熱物の内部温度
分布が目標より小さくなる最低在炉時間以上を確保する
ように制御することが、品質上及び燃料原単位上重要で
ある。Therefore, in terms of quality and fuel consumption, it is important to control the in-reactor time so as to secure at least the minimum in-reactor time in which the internal temperature distribution of the object to be heated is smaller than the target.
【０００４】従来、この在炉時間の制御方法としては、
平均加熱能率を与えるＴ／Ｈ（ton／hour）設定方法
と、次の被加熱物との抽出の時間間隔を与える抽出ピッ
チ設定方法が一般的に行われている。Conventionally, as a method of controlling the in-reactor time,
Generally, a T / H (ton / hour) setting method that gives an average heating efficiency and an extraction pitch setting method that gives a time interval for extraction with the next object to be heated are generally performed.
【０００５】また、特殊な抽出ピッチ設定方法として、
装入時に、被加熱物の標準在炉時間に基づく搬送速度を
用いた抽出ピッチを、被加熱物一本ごとに与えることに
より、被加熱物の幅、長さに係わらず目標とした在炉時
間を達成する方法が、特開昭56−108836号公報に提案さ
れている。As a special extraction pitch setting method,
At the time of charging, the extraction pitch that uses the transport speed based on the standard furnace time of the heated object is given to each heated object, so that the target in-reactor regardless of the width and length of the heated object A method for achieving time is proposed in Japanese Patent Laid-Open No. 56-108836.
【０００６】[0006]
【発明が解決しようとする課題】連続式加熱炉では、炉
内の被加熱物が、炉内一体のウォ−キングビ−ムで搬送
されるので、被加熱物が抽出される度に、抽出された被
加熱物の幅だけ炉内の全被加熱物の位置が変わる。その
ため、従来、一般的に行われている方法では、次の様な
問題があった。In the continuous heating furnace, since the object to be heated in the furnace is conveyed by the walking beam integrated in the furnace, it is extracted every time the object to be heated is extracted. The position of all heated objects in the furnace changes by the width of the heated object. Therefore, the conventional methods generally used have the following problems.
【０００７】Ｔ／Ｈ（ton ／hour）設定方法は、被加熱
物長さ（搬送方向に直角方向の長さ）が長いと、被加熱
物の重量が重くなり、長さが短い場合に比べて在炉時間
が長くなってしまう。The T / H (ton / hour) setting method is such that when the length of the object to be heated (length in the direction perpendicular to the conveying direction) is long, the weight of the object to be heated becomes heavy, and compared with the case where the length is short. Therefore, the time spent in the furnace becomes longer.
【０００８】抽出ピッチ設定方法は、一定の抽出ピッチ
を与えると、被加熱物幅（搬送方向の幅）が広いとき、
狭い被加熱物よりも速く搬送されて、在炉時間が短くな
ってしまう。In the extraction pitch setting method, when a constant extraction pitch is given, when the width of the object to be heated (width in the carrying direction) is large,
It is transported faster than a narrow object to be heated, and the in-furnace time becomes shorter.
【０００９】また、上記の問題を解決する為に、被加熱
物の長さ、幅に係わらず、目標とした在炉時間を達成す
る方法として提案された特開昭56−108836号公報の抽出
ピッチ設定方法でも、被加熱物の装入時に与えられる抽
出ピッチで終始操業するため、実際の操炉で発生する、
被加熱物の加熱状況や仕上げ圧延状況による抽出ピッチ
の変更や、ライン休止による抽出ピッチの変更に対応で
きないという問題があった。Further, in order to solve the above problems, the extraction of Japanese Patent Laid-Open No. 56-108836 proposed as a method for achieving the target in-reactor time regardless of the length and width of the object to be heated. Even with the pitch setting method, since the operation is always performed at the extraction pitch given when charging the object to be heated, it occurs in the actual furnace,
There is a problem that the extraction pitch cannot be changed depending on the heating condition of the object to be heated or the finish rolling condition and the change of the extraction pitch due to the suspension of the line.
【００１０】例えば、図２に示すように、炉内の抽出側
（炉出口側）から１０本目にある被加熱物がすでに２０
０分在炉していて、被加熱物の標準在炉時間の目標が２
４０分である場合に、抽出側から１０本目の被加熱物ま
での抽出ピッチが４分であれば、本被加熱物は目標在炉
時間を達成する。しかし、トラブルにて５０分間のライ
ン休止が発生すると、本被加熱物の標準在炉時間はすで
に達成しているので、本被加熱物までの抽出ピッチは、
可能な限り短くした方が燃料原単位を低減化するうえで
有利であるが、装入時に決められた抽出ピッチのままで
は、燃料原単位の低減化が実現できない。For example, as shown in FIG. 2, the object to be heated which is the tenth from the extraction side (furnace outlet side) in the furnace is already 20
The target for the standard in-react time of the object to be heated is 2
In the case of 40 minutes, if the extraction pitch from the extraction side to the tenth object to be heated is 4 minutes, the object to be heated achieves the target in-furnace time. However, if a line break occurs for 50 minutes due to a problem, the standard in-furnace time of the object to be heated has already been achieved, so the extraction pitch up to the object to be heated is
It is advantageous to shorten the fuel consumption rate as much as possible, but it is not possible to reduce the fuel consumption rate with the extraction pitch determined at the time of charging.
【００１１】本発明は、実在炉時間を考慮することによ
り、実際の操炉で発生する、被加熱物の加熱状況や仕上
げ圧延状況による抽出ピッチの変更や、ライン休止によ
る抽出ピッチの変更にも対応可能な、連続式加熱炉の在
炉時間を制御する新規の抽出ピッチ設定方法を提供する
ことを目的としている。The present invention allows the extraction pitch to be changed according to the heating status and finish rolling status of the object to be heated, which is generated in the actual furnace operation, and the extraction pitch due to the line pause, by considering the actual furnace time. It is an object of the present invention to provide a new extraction pitch setting method capable of controlling the time spent in the continuous heating furnace.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するため
に、連続式加熱炉の自動燃焼制御装置において、被加熱
物が炉内に入ってからの時間を演算する手段と、被加熱
物の炉内における位置を演算する手段と、前記時間と位
置から、被加熱物の性状及び抽出目標温度に基づいて求
めた最低在炉時間を満足するように、炉内の各被加熱物
の抽出ピッチを演算する手段とを具備した連続式加熱炉
自動燃焼制御装置を用いる。In order to achieve the above object, in an automatic combustion control device for a continuous heating furnace, means for calculating the time after the object to be heated enters the furnace, and the object to be heated Means for calculating the position in the furnace, and the extraction pitch of each heated object in the furnace so as to satisfy the minimum in-furnace time obtained from the time and position based on the property of the heated object and the extraction target temperature. And a continuous heating furnace automatic combustion control device having a means for calculating
【００１３】さらに、炉内の各被加熱物の抽出ピッチを
演算する手段は、被加熱物が抽出されるたびに、炉内の
各被加熱物に対して、最低在炉時間となる抽出ピッチを
求め、最小抽出ピッチを与える被加熱物より抽出側にあ
る全ての被加熱物の抽出ピッチを最小抽出ピッチと同じ
にする手段を備えている。Further, the means for calculating the extraction pitch of each object to be heated in the furnace is such that each time the object to be heated is extracted, the extraction pitch for the object to be heated in the furnace becomes the minimum in-reacting time. And means for making the extraction pitches of all the objects to be heated on the extraction side of the object to be heated that give the minimum extraction pitch the same as the minimum extraction pitch.
【００１４】そして、連続式加熱炉の自動燃焼制御方法
において、炉内に入ってからの被加熱物の時間を演算す
る工程と、炉内における被加熱物の位置を演算する工程
と、前記時間と位置から、被加熱物の性状及び抽出目標
温度に基づいて求めた最低在炉時間を満足するように、
炉内の各被加熱物の抽出ピッチを演算する工程とを具備
した連続式加熱炉の自動燃焼制御方法を用いる。In the automatic combustion control method for a continuous heating furnace, the step of calculating the time of the object to be heated after entering the furnace, the step of calculating the position of the object to be heated in the furnace, and the time From the position and so that the minimum in-reactor time obtained based on the properties of the object to be heated and the extraction target temperature is satisfied,
An automatic combustion control method for a continuous heating furnace, which comprises a step of calculating an extraction pitch of each object to be heated in the furnace.
【００１５】[0015]
【作用】上記のように構成された連続式加熱炉の自動燃
焼制御方法及び装置を用いると、炉内に入ってからの被
加熱物の時間を考慮した抽出ピッチを用いるので、炉内
の各被加熱物に対して、実在炉時間を反映した抽出ピッ
チを与えることができるようになる。Using the automatic combustion control method and apparatus for the continuous heating furnace configured as described above, the extraction pitch considering the time of the object to be heated after entering the furnace is used. It becomes possible to give the extraction pitch reflecting the actual furnace time to the object to be heated.
【００１６】[0016]
【実施例】図１は、本発明を実施した連続式加熱炉の概
念図である。炉内被加熱物トラッキング装置１は、炉内
の各被加熱物Ｓｉ（ｉ=1,2,3・・ｎ）が、ウォ−キング
ビ−ム５により、炉内を移動する度に、各被加熱物の炉
内位置を演算する。EXAMPLE FIG. 1 is a conceptual diagram of a continuous heating furnace in which the present invention is carried out. The in-furnace heated object tracking device 1 is arranged so that each heated object Si (i = 1,2,3 ... n) in the furnace is moved by the walking beam 5 each time the heated object Si is moved in the furnace. Calculate the position of the heated object in the furnace.
【００１７】在炉時間演算装置２は、各被加熱物ごと
に、炉内に装入された時点から現在までの在炉時間を演
算する。抽出ピッチ演算装置３は、被加熱物抽出ごと、
または一定時間間隔（通常抽出ピッチの１／２程度）
で、得られた炉内位置と在炉時間から、図３のフロ−チ
ャ−トに示すように、次の手順で、各被加熱物に対する
抽出ピッチを演算する。 （イ）最低在炉時間Ｔｍｉｎi を式１により、抽出目標
温度、被加熱物性状、などの関数として求める。The in-furnace time computing device 2 computes the in-furnace time from the time when it is loaded into the furnace to the present for each object to be heated. The extraction pitch computing device 3 is provided for each object to be heated,
Or fixed time interval (usually about 1/2 of extraction pitch)
Then, from the obtained in-furnace position and in-furnace time, as shown in the flowchart of FIG. 3, the extraction pitch for each object to be heated is calculated in the following procedure. (B) The minimum in-furnace time Tmin i is obtained as a function of the extraction target temperature, the property of the material to be heated, and the like by the equation 1.
【００１８】 Ｔｍｉｎi ＝ｆ（抽出目標温度、被加熱物サイズ、被加熱物の材質、・・・ ） ・・・・式１ （ロ）搬送速度Ｖｓi を、最低在炉時間Ｔｍｉｎi 、抽
出側からの距離Ｌｓi 、在炉時間Ｔｓi を用いて、式２
で求める。Tmin i = f (extraction target temperature, size of heated object, material of heated object, ...) Equation 1 (b) Conveyance speed Vs i , minimum in-furnace time Tmin i , extraction Equation 2 using the distance Ls i from the side and the in-reactor time Ts i
Ask in.
【００１９】 Ｖｓi ＝Ｌｓi ／（Ｔｍｉｎi −Ｔｓi ） ・・・式２ （但し、Ｔｍｉｎi ≦Ｔｓi のときは、Ｖｓi ＝∞とす
る）。 （ハ）このＶｓi の値を抽出側から装入側にチェックし
て、最小のＶｓi の値を求め、Ｖ１ｍｉｎとする。 （ニ）Ｖ１ｍｉｎを与える被加熱物よりも抽出側にある
全ての被加熱物に対して、抽出ピッチＰｉを、被加熱物
幅ＢｉとＶ１ｍｉｎを用いて、式３で求める。Vs i = Ls i / (Tmin i −Ts i ) Equation 2 (However, when Tmin i ≦ Ts i , Vs i = ∞). (C) The value of Vs i is checked from the extraction side to the charging side, and the minimum value of Vs i is obtained, which is V1min. (D) The extraction pitch Pi is calculated by the equation 3 using all the heated object widths Bi and V1min for all the heated objects on the extraction side of the heated object that gives V1min.
【００２０】 Ｐｉ＝Ｂｉ／Ｖ１ｍｉｎ ・・・式３ （但し、Ｐｉがラインの下限値Ｐｍｉｎ以下の場合は、
Ｐｉ＝Ｐｍｉｎとする。） この抽出ピッチＰｉで操炉することにより、Ｖ１ｍｉｎ
を与える被加熱物よりも抽出側にある全ての被加熱物
は、最低在炉時間を満足することになる。Pi = Bi / V1min Equation 3 (However, when Pi is equal to or lower than the lower limit value Pmin of the line,
Let Pi = Pmin. ) By operating the furnace at this extraction pitch Pi, V1min
All the objects to be heated that are on the extraction side of the object to be heated will satisfy the minimum in-furnace time.
【００２１】また、Ｖ１ｍｉｎを与える被加熱物がＳ1
であったとすると、ｉ＝ｌ＋１，ｌ＋２，・・・、ｍの
被加熱物Ｓｉに対して、同様にＶｓi の最小値を求め、
これをＶ２ｍｉｎとして、 Ｐｉ＝Ｂｉ／Ｖ２ｍｉｎ とすることにより、将来の抽出ピッチの予測ができる。The object to be heated that gives V1min is S 1
Then, the minimum value of Vs i is similarly obtained for the heated object Si of i = 1 + 1, 1 + 2 ,.
By setting this as V2min and setting Pi = Bi / V2min, the future extraction pitch can be predicted.
【００２２】上記計算例を表１と表２に示す。表１は、
この方法で求めた抽出ピッチと特開昭56−108836号公報
で求めた抽出ピッチで操炉した場合において、最低在炉
時間を満足する最小の在炉時間で操炉する精度を比較し
たものであるが、特開昭56−108836号公報の手法では、
実在炉時間を反映していないため、最低在炉時間を満足
していない被加熱物があるのに対し、本手法での抽出ピ
ッチを用いると、全ての被加熱物は最低在炉時間を満足
しており、精度の良い操炉が行えることがわかる。The above calculation examples are shown in Tables 1 and 2. Table 1 shows
In the case of operating the extraction pitch obtained by this method and the extraction pitch obtained in JP-A-56-108836, the accuracy of operating the furnace in the minimum in-reactor time that satisfies the minimum in-reactor time is compared. However, in the method of JP-A-56-108836,
Since the heating time does not reflect the actual furnace time, there are some heated objects that do not satisfy the minimum furnace time, whereas using the extraction pitch of this method, all heated objects satisfy the minimum furnace time. Therefore, it can be seen that the furnace can be operated with high accuracy.
【００２３】[0023]
【表１】 [Table 1]
【００２４】また、表２は、表１と同一の状況で、２０
分のライン休止が発生した場合を示すが、特開昭56−10
8836号公報で求めた抽出ピッチは、ライン休止後も表１
で求めた抽出ピッチと同じであるのに対し、本発明方法
で求めた抽出ピッチは、表１で求めた抽出ピッチに比べ
小さな値に再設定されるので、特開昭56−108836号公報
の方法に比べて在炉時間を短くすることが可能となり、
燃料原単位の低減が図れる。Table 2 shows the same situation as Table 1
The following shows the case where a minute line pause occurs.
The extraction pitch obtained in the 8836 publication is shown in Table 1 even after the line is paused.
The extraction pitch obtained by the method of the present invention is reset to a value smaller than the extraction pitch obtained in Table 1, while it is the same as the extraction pitch obtained in the method described in JP-A-56-108836. Compared with the method, it is possible to shorten the time in the furnace,
The fuel consumption rate can be reduced.
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【発明の効果】本発明は、実在炉時間を考慮した抽出ピ
ッチを与える構成なので、炉内の各被加熱物に対して常
に最適な抽出ピッチを与えることができるようになり、
従来の連続式加熱炉の在炉時間の制御方法が抱えてい
た、実際の操炉で発生する被加熱物の加熱状況や仕上げ
圧延状況による抽出ピッチの変更や、ライン休止による
抽出ピッチの変更に対応できないという問題が解消され
る。EFFECT OF THE INVENTION Since the present invention is configured to give the extraction pitch in consideration of the actual furnace time, it becomes possible to always give the optimum extraction pitch to each object to be heated in the furnace,
For changing the extraction pitch depending on the heating condition and finish rolling condition of the object to be heated generated in the actual furnace, which was involved in the conventional method of controlling the in-furnace time of the continuous heating furnace, and changing the extraction pitch by stopping the line. The problem of not being able to cope is solved.
【図１】本発明を実施した連続式加熱炉の概念図FIG. 1 is a conceptual diagram of a continuous heating furnace embodying the present invention.
【図２】ライン休止時における連続式加熱炉内の被加熱
物位置を示す図FIG. 2 is a diagram showing a position of an object to be heated in a continuous heating furnace when the line is stopped.
【図３】本発明の抽出ピッチ算出実施例のフロ−チャ−
ト図FIG. 3 is a flowchart of an extracted pitch calculation embodiment of the present invention.
Figure
１ 炉内被加熱物トラッキング装置 ２ 在炉時間演算装置 ３ 抽出ピッチ演算装置 ４ 連続式加熱炉 ５ ウォ−キングビ−ム Ｓｉ 被加熱物 Ｌｓi 被加熱物から抽出側までの距離 ＬR 炉全長1 In-furnace heated object tracking device 2 In-furnace time computing device 3 Extraction pitch computing device 4 Continuous heating furnace 5 Walking beam Si heating object Ls i Distance from heating object to extraction side L R total furnace length
Claims (3)
て、 被加熱物が炉内に入ってからの時間を演算する手段と、 被加熱物の炉内における位置を演算する手段と、 前記時間と位置から、被加熱物の性状及び抽出目標温度
に基づいて求めた最低在炉時間を満足するように、炉内
の各被加熱物の抽出ピッチを演算する手段とを具備した
連続式加熱炉自動燃焼制御装置。1. An automatic combustion control device for a continuous heating furnace, means for calculating a time after an object to be heated enters the furnace, means for calculating a position of the object to be heated in the furnace, and the time. And a position, a continuous heating furnace equipped with means for calculating the extraction pitch of each heated object in the furnace so as to satisfy the minimum in-furnace time obtained based on the properties of the heated object and the extraction target temperature. Automatic combustion control device.
物の抽出ピッチを演算する手段は、被加熱物が抽出され
るたびに、炉内の各被加熱物に対して、最低在炉時間と
なる抽出ピッチを求め、最小抽出ピッチを与える被加熱
物より抽出側にある全ての被加熱物の抽出ピッチを最小
抽出ピッチと同じにする手段を備えている。2. The apparatus according to claim 1, wherein the means for calculating the extraction pitch of each heated object in the furnace has a minimum value for each heated object in the furnace every time the heated object is extracted. A means is provided for obtaining an extraction pitch that is the in-furnace time, and for making all the extraction pitches of the objects on the extraction side of the object to be heated that give the minimum extraction pitch the same as the minimum extraction pitch.
て、 炉内に入ってからの被加熱物の時間を演算する工程と、 炉内における被加熱物の位置を演算する工程と、 前記時間と位置から、被加熱物の性状及び抽出目標温度
に基づいて求めた最低在炉時間を満足するように、炉内
の各被加熱物の抽出ピッチを演算する工程とを具備した
連続式加熱炉の自動燃焼制御方法。3. An automatic combustion control method for a continuous heating furnace, the step of calculating the time of the object to be heated after entering the furnace, the step of calculating the position of the object to be heated in the furnace, and the time. And a position, a continuous heating furnace comprising a step of calculating the extraction pitch of each heated object in the furnace so as to satisfy the minimum in-furnace time obtained based on the property of the heated object and the extraction target temperature. Automatic combustion control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3554894A JPH07242953A (en) | 1994-03-07 | 1994-03-07 | Method and device for controlling autocombustion in continuous type heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3554894A JPH07242953A (en) | 1994-03-07 | 1994-03-07 | Method and device for controlling autocombustion in continuous type heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07242953A true JPH07242953A (en) | 1995-09-19 |
Family
ID=12444787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3554894A Pending JPH07242953A (en) | 1994-03-07 | 1994-03-07 | Method and device for controlling autocombustion in continuous type heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07242953A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262527A (en) * | 2006-03-29 | 2007-10-11 | Sumitomo Metal Ind Ltd | Method for predicting extraction pitch in continuous type heating furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051534A (en) * | 1983-08-31 | 1985-03-23 | Nippon Oil Co Ltd | Removal of nitrogen oxide |
| JPH05331528A (en) * | 1992-05-29 | 1993-12-14 | Kawasaki Steel Corp | Method and device for controlling carrying velocity of steel plate in roller hearth type heat treatment furnace |
-
1994
- 1994-03-07 JP JP3554894A patent/JPH07242953A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051534A (en) * | 1983-08-31 | 1985-03-23 | Nippon Oil Co Ltd | Removal of nitrogen oxide |
| JPH05331528A (en) * | 1992-05-29 | 1993-12-14 | Kawasaki Steel Corp | Method and device for controlling carrying velocity of steel plate in roller hearth type heat treatment furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007262527A (en) * | 2006-03-29 | 2007-10-11 | Sumitomo Metal Ind Ltd | Method for predicting extraction pitch in continuous type heating furnace |
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