JPH0135895B2 - - Google Patents
Info
- Publication number
- JPH0135895B2 JPH0135895B2 JP56062970A JP6297081A JPH0135895B2 JP H0135895 B2 JPH0135895 B2 JP H0135895B2 JP 56062970 A JP56062970 A JP 56062970A JP 6297081 A JP6297081 A JP 6297081A JP H0135895 B2 JPH0135895 B2 JP H0135895B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- furnace
- billet
- control
- heating zone
- 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.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 53
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 description 16
- 238000000605 extraction Methods 0.000 description 9
- 238000013523 data management Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000002436 steel type Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000011437 continuous method Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Description
【発明の詳細な説明】
この発明は連続式加熱炉の温度制御方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control method for a continuous heating furnace.
従来圧延に先立つて鋼片の加熱をおこなう連続
式加熱炉において鋼片の抽出温度を制御する制御
方法としては、炉内の全鋼片に対して公知の伝熱
方程式を用いてオンライン計算機により抽出温度
が一定となるよう昇温曲線を求め、これにより炉
内各帯の雰囲気温度を決定する手法が提案されて
きた。ところが炉内の全鋼片に対して炉内装入後
の各時刻における昇温予測をおこなうために必要
な伝熱計算所要時間は膨大なものとなるため、オ
ンライン計算実施に際しては極めて大型の計算機
が必要となり費用がかさむ。 Conventionally, in a continuous heating furnace where the billet is heated prior to rolling, the extraction temperature of the billet is controlled by an online computer using a known heat transfer equation for all billets in the furnace. A method has been proposed in which a temperature rise curve is determined so that the temperature remains constant, and the atmospheric temperature in each zone within the furnace is determined based on this curve. However, the time required for heat transfer calculations to predict the temperature rise of all the steel slabs in the furnace at each time after they are placed in the furnace is enormous, so an extremely large computer is required to perform online calculations. This is necessary and costly.
この発明は上記従来の欠点を解消するもので、
計算機による演算時間が短時間ですみ、オンライ
ンでの実施が容易な連続式加熱炉の制御方法を提
供しようとするものである。 This invention solves the above-mentioned conventional drawbacks,
The purpose of this invention is to provide a control method for a continuous heating furnace that requires a short time for calculation by a computer and is easy to implement online.
しかしてこの発明は、鋼片の加熱をおこなう連
続式加熱炉において、装入口から装入された所定
の対象鋼片の加熱帯入口における鋼片推定温度を
算出し、鋼片の昇温管理曲線に応じて予め定めた
上記加熱帯入口における鋼片管理温度と上記鋼片
推定温度とを比較し、その偏差に応じて上記加熱
帯の炉温設定値の修正をおこなうことを特徴とす
る連続式加熱炉の制御方法である。 However, this invention calculates the estimated temperature of the steel billet at the heating zone inlet of a predetermined target steel billet charged from the charging port in a continuous heating furnace that heats the billet, and calculates the temperature rise control curve of the steel billet. A continuous method characterized in that the control temperature of the steel billet at the inlet of the heating zone, which is determined in advance according to This is a method of controlling a heating furnace.
この発明において、鋼片の昇温管理曲線とは、
鋼片の進行に伴う加熱炉内各位値における鋼片温
度を示す昇温曲線のうち、たとえば投入熱量を最
小にする等の所望の目的をもつて選定した昇温曲
線をいう。また鋼片管理温度とは前記昇温管理曲
線上の鋼片温度をいう。 In this invention, the temperature increase control curve of the steel billet is
Among the temperature rise curves that indicate the temperature of the steel billet at various points in the heating furnace as the billet progresses, it refers to a temperature increase curve that is selected for a desired purpose, such as minimizing the amount of heat input. Moreover, the steel billet control temperature refers to the steel billet temperature on the temperature increase control curve.
この発明においては、加熱炉の加熱帯入口にお
ける鋼片推定温度と加熱帯入口における鋼片管理
温度との偏差に応じて加熱帯の炉温設定値の修正
をおこなうが、これは一般に炉温の制御のみで抽
出温度を制御し得る程度の通常予想される抽出速
度の変動に対しては、炉内装入後の鋼片の各位置
における鋼片昇温曲線の算出および各燃焼帯の制
御は必ずしも必要ではなく、加熱帯入口における
鋼片温度を算出して管理温度と比較し、鋼片温度
を外部から制御するのに最も効果的な加熱帯の炉
温を制御するだけで、充分な精度で鋼片の抽出温
度を制御することが出来るという、発明者の実験
結果から得た知見に基づくものである。 In this invention, the furnace temperature setting value of the heating zone is corrected according to the deviation between the estimated steel billet temperature at the heating zone entrance of the heating furnace and the steel billet control temperature at the heating zone entrance, but this is generally done by adjusting the furnace temperature. For normally expected fluctuations in the extraction rate to the extent that the extraction temperature can be controlled by control alone, it is not always necessary to calculate the billet temperature rise curve at each location of the billet after loading it into the furnace and to control each combustion zone. It is not necessary to calculate the temperature of the steel billet at the entrance of the heating zone, compare it with the control temperature, and control the furnace temperature of the heating zone that is most effective in controlling the temperature of the billet from the outside with sufficient accuracy. This is based on the inventor's knowledge obtained from experimental results that the extraction temperature of the steel billet can be controlled.
以下図面によりこの発明を３帯式加熱炉に適用
した実施例について説明する。 An embodiment in which the present invention is applied to a three-zone heating furnace will be described below with reference to the drawings.
図中１は加熱炉で、予熱帯２、加熱帯３、均熱
帯４を有している。５は炉温制御装置で、炉温調
節計等をそなえた公知の構成のもので、加熱帯３
および均熱帯４のバーナの燃焼量を調節して各帯
の炉温を設定値に維持する。６ａ〜６ｄは炉温検
出器、７は鋼片搬送装置に連動して鋼片の炉内位
置推定用の信号を発するパルスゼネレータから成
る位置検出器、８は鋼片の鋼種およびサイズのデ
ータ打込用のタイプライタ、９は操業データ管理
装置である。また１０は鋼片温度演算回路、１１
は管理曲線選定回路、１２はこれら両回路の出力
を比較して偏差値信号を発する比較器、１３は炉
温設定値演算回路、１４は炉温設定値を記憶する
記憶装置、１５はグラフイツクデイスプレイから
成る表示装置である。 In the figure, 1 is a heating furnace, which has a pre-heating zone 2, a heating zone 3, and a soaking zone 4. Reference numeral 5 denotes a furnace temperature control device, which is of a known configuration and equipped with a furnace temperature controller, etc.
The combustion amount of the burner in the soaking zone 4 is adjusted to maintain the furnace temperature in each zone at the set value. Numerals 6a to 6d are furnace temperature detectors, 7 is a position detector consisting of a pulse generator that is linked to the billet transport device and generates a signal for estimating the position of the billet in the furnace, and 8 is a data input device for the steel type and size of the billet. 9 is an operational data management device. Further, 10 is a steel billet temperature calculation circuit, 11
1 is a control curve selection circuit, 12 is a comparator that compares the outputs of these two circuits and generates a deviation value signal, 13 is a furnace temperature set value calculation circuit, 14 is a storage device that stores the furnace temperature set value, and 15 is a graphic It is a display device consisting of a display.
次に上記装置を用いたこの発明の制御手順を説
明すると、先ず加熱帯３の入口Ａにおける鋼片の
管理温度TAを次のようにして定める。すなわち、
加熱炉１に続く圧延設備の能力および加熱炉１の
能力によつて決まる鋼片の炉内滞留時間tf、およ
び圧延温度から決まる鋼片の抽出温度（本実施例
では中心温度Tfおよび表面との温度偏差△Tfに
より抽出温度を規定した）とから、鋼片の各鋼種
およびサイズに対して昇温曲線を求める。この昇
温曲線はオフラインにおいて計算機により公知の
伝熱計算をおこなつて求める。得られた昇温曲線
のうち
を最小にする昇温曲線を昇温管理曲線Ｔとして、
加熱帯の入口Ａに対応する温度を管理温度TAと
し、抽出温度の許容差に対応して定めた管理温度
TAの許容差を△TAとする。このようにして定め
た各鋼種およびサイズに対する管理温度TAおよ
び許容差△TAを管理曲線選定回路１１に記憶さ
せておく。同様に上記昇温管理曲線Ｔ上において
加熱帯３の出口Ｂに対応する出口温度TBを管理
曲線選定回路１１に記憶させておく。 Next, the control procedure of the present invention using the above device will be explained. First, the control temperature T A of the steel slab at the entrance A of the heating zone 3 is determined as follows. That is,
The residence time t f of the steel billet in the furnace, which is determined by the capacity of the rolling equipment following the heating furnace 1 and the capacity of the heating furnace 1, and the extraction temperature of the steel billet, which is determined from the rolling temperature (in this example, the center temperature T f and the surface The extraction temperature was defined by the temperature deviation △T f from This temperature rise curve is obtained by performing a known heat transfer calculation off-line using a computer. Of the temperature rise curves obtained The temperature increase curve that minimizes the temperature increase control curve T,
The temperature corresponding to the inlet A of the heating zone is the control temperature T A , and the control temperature is determined according to the tolerance of the extraction temperature.
Let the tolerance of T A be △T A. The control temperature T A and tolerance ΔT A for each steel type and size thus determined are stored in the control curve selection circuit 11. Similarly, the outlet temperature T B corresponding to the outlet B of the heating zone 3 on the temperature increase control curve T is stored in the control curve selection circuit 11.
さて加熱炉１の操業は、炉温制御装置５の炉温
調節計を作業者が手動で設定しておこなう。この
炉温の初期設定値は、鋼片の昇温管理曲線Ｔに対
応した値とする。操業中、炉温検出器６ａ〜６ｄ
による炉温実測値、位置検出器７による鋼片位置
信号、およびタイプライタ８による鋼種およびサ
イズ信号を操業データ管理装置９に与えておく。
所定の対象鋼片（本実施例では５本おきの鋼片）
W1，W2，W3，……について、該対象鋼片が装
入口から炉に装入された時点以後、適宜のサイク
ル（たとえば１分おき）をもつて鋼片温度演算回
路１０により鋼片の推定温度を算出する。この演
算はオンラインにおいて公知の伝熱式を用いてお
こない、対象鋼片が加熱帯３の入口Ａに達した時
点において該入口における対象鋼片の推定温度tA
を比較器１２に出力するとともに表示装置１４に
表示する。一方操業データ管理装置９内の鋼種お
よびサイズのデータと鋼片位置データとを用いて
管理曲線選定回路１１は対象鋼片が加熱帯の入口
Ａに達した時点において、内部に記憶した管理温
度TA、許容偏差△TA、および出口温度TBを出力
し、比較器１２はこの管理温度TAと鋼片温度演
算回路１０の発する鋼片推定温度tAとを比較して
その温度偏差信号△tAを炉温設定値演算回路１３
に与える。炉温設定値演算回路１３により、この
温度偏差△tAと許容偏差△TAとの比較をおこな
い、△tAが△TAより大である場合のみ、温度tAな
る対象鋼片が加熱帯３の出口Ｂにおいて出口温度
TBに昇温するための加熱帯の炉温設定値TSを、
公知の伝熱式により演算して記憶装置１４に与え
る。また対象鋼片の加熱帯の入口Ａにおける温度
偏差△tAが許容偏差△TA以下であれば、炉温設
定値を変更する必要はないので炉温設定値演算回
路１３による演算はおこなわない。記憶装置１４
は新たな対象鋼片が加熱帯３内に進入した時点
で、該時点において加熱帯３内に存在する各対象
鋼片についての炉温設定値TSのうちの最大値を
出力して表示装置１５上に炉温設定値TSとして
表示する。そこで作業者はこの表示を見て炉温制
御装置５の炉温調節計の設定変更をおこなえばよ
い。これにより各鋼片は所望の抽出温度に加熱さ
れて加熱炉から圧延ラインへと供給される。 Now, the operation of the heating furnace 1 is carried out by an operator manually setting the furnace temperature controller of the furnace temperature control device 5. The initial setting value of this furnace temperature is a value corresponding to the temperature increase control curve T of the steel billet. During operation, furnace temperature detectors 6a to 6d
The actual furnace temperature measured by , the billet position signal from the position detector 7 , and the steel type and size signal from the typewriter 8 are given to the operation data management device 9 .
Predetermined target steel pieces (in this example, every fifth steel piece)
With respect to W 1 , W 2 , W 3 , ..., the steel billets are determined by the billet temperature calculation circuit 10 at appropriate cycles (for example, every minute) after the target billets are charged into the furnace from the charging port. Calculate the estimated temperature of the piece. This calculation is performed online using a known heat transfer equation, and when the target steel piece reaches the inlet A of the heating zone 3, the estimated temperature t A of the target steel piece at the inlet
is output to the comparator 12 and displayed on the display device 14. On the other hand, using the steel type and size data and billet position data in the operation data management device 9, the control curve selection circuit 11 selects the internally stored control temperature T when the target billet reaches the inlet A of the heating zone. A , tolerance ΔT A , and outlet temperature T B are output, and the comparator 12 compares this control temperature T A with the estimated steel billet temperature t A generated by the billet temperature calculation circuit 10 to produce a temperature deviation signal. △t A is the furnace temperature set value calculation circuit 13
give to The furnace temperature set value calculation circuit 13 compares this temperature deviation △t A with the tolerance deviation △T A , and only when △t A is larger than △T A , the target steel piece at temperature t A is processed. Exit temperature at exit B of tropical 3
The furnace temperature setting value T S of the heating zone to raise the temperature to T B is
It is calculated using a known heat transfer formula and is provided to the storage device 14. Further, if the temperature deviation △t A at the entrance A of the heating zone of the target steel slab is less than the allowable deviation △T A , there is no need to change the furnace temperature set value, so no calculation is performed by the furnace temperature set value calculation circuit 13. . Storage device 14
At the time when a new target steel slab enters the heating zone 3, the maximum value of the furnace temperature setting values T S for each target steel slab existing in the heating zone 3 at that time is outputted and displayed on the display device. 15 as the furnace temperature set value T S. Therefore, the operator can change the settings of the furnace temperature controller of the furnace temperature control device 5 by looking at this display. Thereby, each steel billet is heated to a desired extraction temperature and supplied from the heating furnace to the rolling line.
なお上記実施例においては炉温設定値TSは表
示装置１５上に表示し、作業者がこの値を見て手
動にて炉温制御装置５の炉温調節計を操作するよ
うにしたが、第１図に鎖線１６で示すように炉温
設定値TSを、必要に応じてDAコンバータを介し
て、炉温制御装置５の温度調節計に直接入力する
ことも可能である。 In the above embodiment, the furnace temperature set value T S is displayed on the display device 15, and the operator manually operates the furnace temperature controller of the furnace temperature control device 5 by looking at this value. As shown by a chain line 16 in FIG. 1, it is also possible to directly input the furnace temperature set value T S to the temperature controller of the furnace temperature control device 5 via a DA converter if necessary.
また上記実施例においては鋼片の昇温管理曲線
として、鋼片昇温曲線のうち時間積分値が最も小
なる曲線を選定したので、加熱炉への投入燃料お
よび加熱炉からの損失熱量が最小となり、燃料原
単位の向上をはかることができるという長所を有
するが、鋼片がその材質等により特別の昇温曲線
に沿つた加熱履歴を必要とする場合などは、該昇
温曲線を昇温管理曲線として選定すればよい。 In addition, in the above example, the curve with the smallest time integral value among the steel billet temperature rise curves was selected as the temperature rise control curve for the steel billet, so the amount of fuel input to the heating furnace and the amount of heat lost from the heating furnace was minimized. This has the advantage of being able to improve the fuel consumption rate, but if the steel billet requires a heating history along a special temperature rise curve due to its material etc. It can be selected as a control curve.
以上はこの発明を単一の加熱帯をそなえた加熱
炉に適用した場合について説明したが、この発明
は複数帯の加熱帯をそなえた加熱炉にも適用でき
るものである。この場合は各加熱帯、あるいは加
熱の主体をなす加熱帯等の特定の加熱帯に対し
て、本発明方法を適用すればよい。 Although the present invention has been described above in a case where it is applied to a heating furnace equipped with a single heating zone, the present invention can also be applied to a heating furnace equipped with a plurality of heating zones. In this case, the method of the present invention may be applied to each heating zone or to a specific heating zone such as the heating zone that mainly performs heating.
以上説明したようにこの発明によれば、加熱帯
入口における対象鋼片の推定温度を算出し、加熱
帯入口における鋼片管理温度と前記推定温度との
偏差に応じて加熱帯の炉温設定値の修正をおこな
うので、計算機による演算時間が短時間ですむた
めマイクロコンピユータ等を使用してオンライン
で容易に実施することができ、極めて安い費用で
鋼片抽出温度の制御をおこなうことができる。 As explained above, according to the present invention, the estimated temperature of the target steel billet at the heating zone entrance is calculated, and the furnace temperature setting value of the heating zone is determined according to the deviation between the billet control temperature at the heating zone entrance and the estimated temperature. Since the calculation time required by a computer is short, it can be easily carried out online using a microcomputer, etc., and the billet extraction temperature can be controlled at an extremely low cost.
第１図はこの発明を適用した連続式加熱炉の制
御装置の一実施例を示すブロツク線図、第２図は
第１図の制御装置において用いる鋼片の昇温管理
曲線を示す線図である。
１……加熱炉、３……加熱帯、５……炉温制御
装置、６ａ〜６ｄ……炉温検出器、７……位置検
出器、８……タイプライタ、９……操業データ管
理装置、１０……鋼片温度演算回路、１１……管
理曲線選定回路、１２……比較器、１３……炉温
設定値演算回路、１５……表示装置。
Fig. 1 is a block diagram showing an embodiment of a control device for a continuous heating furnace to which the present invention is applied, and Fig. 2 is a diagram showing a temperature rise control curve for a steel billet used in the control device of Fig. 1. be. 1... Heating furnace, 3... Heating zone, 5... Furnace temperature control device, 6a to 6d... Furnace temperature detector, 7... Position detector, 8... Typewriter, 9... Operation data management device , 10... Steel billet temperature calculation circuit, 11... Management curve selection circuit, 12... Comparator, 13... Furnace temperature set value calculation circuit, 15... Display device.
Claims (1)
て、装入口から装入された所定の対象鋼片の加熱
帯入口における鋼片推定温度を算出し、鋼片の昇
温管理曲線に応じて予め定めた上記加熱帯入口に
おける鋼片管理温度と上記鋼片推定温度とを比較
し、その偏差に応じて上記加熱帯の炉温設定値の
修正をおこなうことを特徴とする連続式加熱炉の
制御方法。1. In a continuous heating furnace that heats steel billets, calculate the estimated temperature of a given target steel billet at the heating zone inlet charged from the charging port, and set it in advance according to the temperature rise control curve of the steel billet. A control method for a continuous heating furnace, characterized in that the control temperature of the steel billet at the entrance of the heating zone is compared with the estimated temperature of the steel billet, and the furnace temperature setting value of the heating zone is corrected according to the deviation. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6297081A JPS57177923A (en) | 1981-04-24 | 1981-04-24 | Controlling method for continuous type heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6297081A JPS57177923A (en) | 1981-04-24 | 1981-04-24 | Controlling method for continuous type heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57177923A JPS57177923A (en) | 1982-11-01 |
| JPH0135895B2 true JPH0135895B2 (en) | 1989-07-27 |
Family
ID=13215704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6297081A Granted JPS57177923A (en) | 1981-04-24 | 1981-04-24 | Controlling method for continuous type heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57177923A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4650723B2 (en) * | 2005-03-28 | 2011-03-16 | 住友金属工業株式会社 | Heat treatment method and quality control method for steel pipe as heat treated material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538922A (en) * | 1978-09-08 | 1980-03-18 | Hitachi Ltd | Heating furnace controlling method |
-
1981
- 1981-04-24 JP JP6297081A patent/JPS57177923A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538922A (en) * | 1978-09-08 | 1980-03-18 | Hitachi Ltd | Heating furnace controlling method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57177923A (en) | 1982-11-01 |
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