JPH03177519A - Method for controlling furnace temperature in continuous annealing furnace - Google Patents
Method for controlling furnace temperature in continuous annealing furnaceInfo
- Publication number
- JPH03177519A JPH03177519A JP31736789A JP31736789A JPH03177519A JP H03177519 A JPH03177519 A JP H03177519A JP 31736789 A JP31736789 A JP 31736789A JP 31736789 A JP31736789 A JP 31736789A JP H03177519 A JPH03177519 A JP H03177519A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- furnace
- product
- dummy material
- dummy
- 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.)
- Granted
Links
- 238000000137 annealing Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 85
- 239000010935 stainless steel Substances 0.000 claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 17
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 30
- 239000010959 steel Substances 0.000 description 30
- 238000002791 soaking Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- SDWKXMBJXPQCJU-UHFFFAOYSA-N 3,5-dimethyl-1,3,5-oxadiazinane-4-thione Chemical compound CN1COCN(C)C1=S SDWKXMBJXPQCJU-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は連続焼鈍炉の炉温制御方法に係り、特にステン
レス鋼帯の連続焼鈍ラインにおいて大幅に焼鈍条件を変
更する板の切換わり点にダミー材を挿入した時の炉温制
御方法に関し、多種のステンレス鋼帯の連続焼鈍分野に
利用される。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a furnace temperature control method for a continuous annealing furnace, and particularly to a method for controlling the furnace temperature in a continuous annealing furnace for stainless steel strips. This method relates to a furnace temperature control method when inserting a dummy material, and is used in the field of continuous annealing of various types of stainless steel strips.
ステンレス鋼帯の連続焼鈍ラインでは、通常需要者の多
種多様の要望に応するため、鋼板の鋼種、寸法ともに多
種多様の鋼帯を通板して処理している。In a continuous annealing line for stainless steel strips, steel strips of a wide variety of steel types and sizes are passed through and processed in order to meet the diverse needs of users.
また、一方製造コストを低減するために、例えば焼鈍と
酸洗の両方が行える多機能ラインとなっているラインも
少くない。Furthermore, in order to reduce manufacturing costs, there are many lines that are multifunctional, for example, capable of performing both annealing and pickling.
このような連続焼鈍ラインでは、通常先行鋼帯の後端に
引続き後行鋼帯の先端を接続した後、連続通板による連
続焼鈍を実施するのであるが、この時残念なが屯先行鋼
帯のヒートパターンおよび焼鈍温度、更にこれに影響を
及ぼす製品板材の厚さ、Ｉｇ、鋼種、放射率等の焼鈍条
件と、後行鋼帯の焼鈍条件に大幅な差異を生じないよう
に、後行鋼帯を選択して接続し連続焼鈍を中断すること
な〈実施する必要がある。In such a continuous annealing line, after connecting the tip of the trailing steel strip to the rear end of the leading steel strip, continuous annealing is carried out by continuous sheet passing. The heat pattern and annealing temperature of the subsequent steel strip, as well as the annealing conditions such as the thickness, Ig, steel type, and emissivity of the product sheet that affect this, and the annealing conditions of the subsequent steel strip are carefully selected to avoid significant differences. It is necessary to select and connect the steel strips and carry out continuous annealing without interrupting the process.
しかし、納期等の理由から、上記関係の持続が保てず、
大幅に焼鈍条件が異なる後行鋼帯を組合わせなければな
らないことがしばしば起る。However, due to delivery deadlines and other reasons, the above relationship could not be maintained.
It often happens that trailing steel strips with significantly different annealing conditions must be combined.
このような場合には、先行鋼帯と、後行鋼帯との間に、
長さ数百メートルのダミー鋼帯を介在させて、該ダミー
鋼帯を通板中に連続焼鈍炉の炉温を後行鋼帯の焼鈍条件
に調整した後、後行鋼帯の焼鈍を行なうのが現状である
。In such a case, between the leading steel strip and the trailing steel strip,
A dummy steel strip with a length of several hundred meters is interposed, and the furnace temperature of the continuous annealing furnace is adjusted to the annealing conditions of the trailing steel strip during the passing of the dummy steel strip, and then the trailing steel strip is annealed. is the current situation.
一方、通常用いられる連続焼鈍炉は、加熱帯。On the other hand, the commonly used continuous annealing furnace has a heating zone.
均熱帯、冷却帯等数ゾーンから構成されており、各ゾー
ン毎にゾーン温度を制御できるようになっている。すな
わち、各ゾーン毎に炉の温度を上げる場合には、例えば
直火式であれば燃料量を増加する等、熱エネネギーの投
入を増加し、逆に炉温を下げる場合には、熱エネルギー
の投入量を減じるとか、更に急冷する場合には冷媒を投
入する等の操作によって炉温を各ゾーン毎に目標とする
温度に調整する。It consists of several zones such as a soaking zone and a cooling zone, and the zone temperature can be controlled for each zone. In other words, when raising the temperature of the furnace in each zone, for example, if it is a direct-fired type, the input of thermal energy is increased, such as by increasing the amount of fuel, and conversely, when decreasing the furnace temperature, the input of thermal energy is increased. The furnace temperature is adjusted to the target temperature for each zone by reducing the input amount, or by adding refrigerant for more rapid cooling.
かくの如き各ゾーンの温度制御の目的は、処理材料の鋼
帯を最適のヒートパターンに合致する温度値に制御する
ことであり、通常直接材料温度を測定してヒートパター
ンが所望の温度値になるように熱エネルギーの投入量を
制御して焼鈍することが望ましい。しかし、ステンレス
鋼帯の焼鈍温度は９００℃以上と高温であるほか、鋼帯
表面の熱吸収率は０．３〜０．４程度と、きわめて低い
ので、搬送されているステンレス鋼帯の表面温度を工業
的に精度よく測定する測温装置は未だ開発されていない
現状である。The purpose of such temperature control in each zone is to control the temperature of the steel strip, which is the material to be processed, to a temperature value that matches the optimum heat pattern, and the material temperature is usually directly measured to ensure that the heat pattern reaches the desired temperature value. It is desirable to perform annealing by controlling the input amount of thermal energy so that the following results are obtained. However, the annealing temperature of the stainless steel strip is high, at 900°C or higher, and the heat absorption rate of the steel strip surface is extremely low, at around 0.3 to 0.4, so the surface temperature of the stainless steel strip being transported is At present, a temperature measuring device that can accurately measure temperature has not yet been developed on an industrial scale.
従って、ステンレス鋼帯の連続焼鈍は、通常炉温と板温
との間のデータを実験的に数多く求めておき、両者間の
相関関係を知り、工業的な熱処理に適用している。すな
わち、処理材を目標とするヒートパターンおよび板温ど
おりに焼鈍しようとする場合には、炉温を制御して処理
材の特性に見合ったヒートパターンおよび板温を得る方
法である。この方法によって焼鈍条件の大幅な差異のな
い先行鋼帯と後行鋼帯の板換わり点における焼鈍条件の
変更を行っている。すなわち、焼鈍炉の各ゾーンの温度
を後行鋼帯向けの温度に調整するか、もしくは通板速度
の変更で対処していた。この方法は、板厚、板幅、ライ
ン速度の変動差により。Therefore, in continuous annealing of stainless steel strips, a large amount of data between the furnace temperature and the plate temperature is usually obtained experimentally, the correlation between the two is known, and the data is applied to industrial heat treatment. That is, when it is desired to anneal a treated material to a target heat pattern and sheet temperature, the method is to control the furnace temperature to obtain a heat pattern and sheet temperature that match the characteristics of the treated material. By this method, the annealing conditions are changed at the plate change point between the leading steel strip and the trailing steel strip, where there is no significant difference in annealing conditions. In other words, this has been dealt with by adjusting the temperature of each zone of the annealing furnace to the temperature for the trailing steel strip, or by changing the threading speed. This method uses variations in plate thickness, plate width, and line speed.
ガス投入量をその変動差分だけ変更し、炉温か変化しな
いように制御する方法である。その考え方は次式で表わ
される。This is a method of controlling the furnace temperature so that it does not change by changing the amount of gas input by the difference in the amount of gas input. The idea is expressed by the following formula.
ここに ρ：板比重
Ｃ１：板比熱
η：炉効率
Ｆ、：板厚、板幅、ライン速度の積
Ｔｏドｉゾーンの出口板温
Ｔ、１：ｉゾーンの入口板温
Ｑｔ：ガス投入量
この考え方は、特公昭６２−１６２５６に開示されてい
るように、Ｆｌの変化分だけガス投入量を変えることに
より、板温ＴＯＬＩ Ｔ１１の関係を制御する方法であ
り、ガス量をフィードフォワード制御する方法である。Here, ρ: Plate specific gravity C1: Plate specific heat η: Furnace efficiency F,: Product of plate thickness, plate width, and line speed To de I zone exit plate temperature T, 1: i zone inlet plate temperature Qt: Gas input amount This idea, as disclosed in Japanese Patent Publication No. 62-16256, is a method of controlling the relationship between plate temperature TOLI T11 by changing the amount of gas input by the change in Fl, and performs feedforward control of the gas amount. It's a method.
ところが、前記の如くダミー材を先行処理材と後行処理
材の間に介在させる場合には、ダミー材は通常普通鋼板
であるので、処理材がステンレス鋼板の場合、先行およ
び後行ステンレスａＳとダミー材の普通鋼帯の間には、
光沢度の大なる差異により熱吸収率が大幅に異なること
によって炉温に急激な変動が発生するという問題点があ
った。However, when a dummy material is interposed between the preceding treated material and the subsequent treated material as described above, the dummy material is usually an ordinary steel plate, so if the treated material is a stainless steel plate, the preceding and succeeding stainless steel aS Between the ordinary steel strips of the dummy material,
There was a problem in that the large difference in glossiness caused a large difference in heat absorption rate, resulting in sudden fluctuations in furnace temperature.
本発明の目的は、ステンレス鋼帯の連続焼鈍において、
先行鋼帯と大幅に焼鈍条件の異なる後行鋼帯の焼鈍前に
、ダミー材を介在せしめて炉温を調整する際に発生する
炉温の急激な変動を防止して、ダミー材から製品材への
円滑な切換わりを行なうための炉内温度の効果的な制御
方法を提供するにある。The purpose of the present invention is to provide continuous annealing of stainless steel strips.
Before annealing the succeeding steel strip, which has significantly different annealing conditions from the preceding steel strip, a dummy material is inserted to prevent sudden changes in the furnace temperature that occur when adjusting the furnace temperature, and the dummy material can be changed from the dummy material to the product material. The purpose of the present invention is to provide an effective method for controlling the temperature inside the furnace so as to smoothly switch to the furnace temperature.
本発明の要旨とするところは次の如くである。 The gist of the present invention is as follows.
すなわち、ステンレスｍｓの連続焼鈍時の通板する板の
切換おり点においてダミー材を挿入し板情報および各ゾ
ーンの出口、入口の板温ならびに板温目標値に基づいて
最適加熱条件を設定するフィードフォワード制御と、炉
温もしくは板温偏差に応じて加熱条件を変更するフィー
ドバック制御とを併用する炉温制御方法において、前記
ダミー材の先端が焼鈍炉に突入すると同時にフィードバ
ック制御を固定し前記ダミー材への熱投入量と製品材へ
の熱投入量との差と、前記ダミー材と製品材との同一炉
温条件下でのヒートパターンの差異に基づく熱負荷の差
により決まる係数の積を燃料の制御ループに加えたフィ
ードフォワード制御を行ない、前記ダミー材通過後にフ
ィードバック制御に戻すことを特徴とする連続焼鈍炉の
炉温制御方法である。In other words, a dummy material is inserted at the switching point of the passing plate during continuous annealing of stainless steel MS, and the optimum heating conditions are set based on the plate information, the plate temperature at the outlet and inlet of each zone, and the plate temperature target value. In a furnace temperature control method that uses both forward control and feedback control that changes heating conditions according to the furnace temperature or plate temperature deviation, the feedback control is fixed at the same time that the tip of the dummy material enters the annealing furnace. The fuel This is a furnace temperature control method for a continuous annealing furnace characterized by performing feedforward control in addition to the control loop of , and returning to feedback control after the dummy material has passed.
本発明の詳細を、加熱帯、均熱帯、冷却帯等複数ゾーン
に分割され、それぞれ独立して加熱制御装置を有する連
続焼鈍炉において実施する場合について説明する。The details of the present invention will be described with reference to a case in which the present invention is implemented in a continuous annealing furnace that is divided into a plurality of zones such as a heating zone, a soaking zone, and a cooling zone, each of which has an independent heating control device.
すなわち、加熱帯の入口にダミー材と次の製品材の溶接
部が達した時点で上記要旨による制御を行う場合につい
て説明する。That is, a case will be described in which the control according to the above-mentioned gist is performed at the time when the welded portion of the dummy material and the next product material reaches the entrance of the heating zone.
すなわち、次の製品材の焼鈍条件を満足させるために、
ダミー材通板中に各ゾーンの設定炉温を従来は次の製品
材に適する温度にしているが、その時に使用しているガ
スｆｆ１Ｑは、ダミー材の板温を上昇させるために使用
したガス量と、炉体を目標温度に保持するために要する
ガス量Ｑｉとの和である。In other words, in order to satisfy the following annealing conditions for the product material,
Conventionally, the furnace temperature in each zone is set to a temperature suitable for the next product material while passing the dummy material, but the gas ff1Q used at that time is the gas used to raise the temperature of the dummy material. and the gas amount Qi required to maintain the furnace body at the target temperature.
すなわち、（１）式から
η
ただし
ρ：ダミー材板比重
Ｃ：ダミー材板比熱
η：炉効率
Ｆ、：板厚、板幅、ライン速度の積
ＴＤ。：各ゾーンにおけるダミー材出ロ板温ＴＤＩ：各
ゾーンにおけるダミー材入ロ板温ＱＬ：炉体を目標温度
に保持するガス投入量ところがダミー材と製品材では同
一板寸法であっても製品材がステンレス鋼板、ダミー材
は普通鋼板のため（２）式の第１項（ＴＤＯＴ□）の値
が異なるために、各ゾーンにおける熱収支のバランスが
崩れ、炉温の急激な変動を生ずることとなる。That is, from equation (1), η where ρ: specific gravity of dummy material plate C: specific heat of dummy material plate η: furnace efficiency F;: product TD of plate thickness, plate width, and line speed. :Temperature of the dummy material in each zone (TDI): Temperature of the dummy material in each zone (QL): Gas input amount to maintain the furnace body at the target temperature However, even if the dummy material and the product material have the same plate dimensions, the product material Since the dummy material is a stainless steel plate and the dummy material is a common steel plate, the value of the first term (TDOT□) in equation (2) is different, which causes an imbalance in the heat balance in each zone and causes sudden fluctuations in the furnace temperature. Become.
そこで、本発明者らは、上記炉温の急激な変動を防止す
るため、予め求めている製品材通板時の動特性、静特性
の補正を行っていたガス必要量への炉温のフィードバッ
クループを一時切ることによって固定し、ダミー材への
熱投入量と製品材への熱投入量との差と５両者の同一炉
温条件下でのヒートパターンの差異に基づく熱負荷の差
により決る係数との積を燃料の制御ループに加えたフィ
ードフォワード制御を炉内で両者が切換る時に行い、ダ
ミー材通過後にフィードバック制御に戻すことにした。Therefore, in order to prevent the above-mentioned rapid fluctuations in the furnace temperature, the present inventors proposed feedback of the furnace temperature to the required amount of gas, which had been corrected for the dynamic characteristics and static characteristics during the threading of the product, which had been determined in advance. The loop is fixed by temporarily cutting it, and the heat load is determined by the difference between the amount of heat input to the dummy material and the amount of heat input to the product material, and the difference in heat pattern between the two under the same furnace temperature condition. We decided to perform feedforward control in which the product of the coefficient and the fuel control loop was added to the fuel control loop when the two were switched in the furnace, and then return to feedback control after the dummy material had passed.
この方法により、従来、炉温を一定に保持することがで
きなかったダミー材から製品材への切換わりにおいても
円滑に炉温を最適温度に保持することが可能となった。With this method, it has become possible to smoothly maintain the furnace temperature at the optimum temperature even when switching from dummy materials to product materials, where it was previously impossible to maintain a constant furnace temperature.
第１図はタイトラインで構成されるステンレス鋼帯の連
続焼鈍装置の配置を示す模式図である。FIG. 1 is a schematic diagram showing the arrangement of a continuous annealing apparatus for stainless steel strips composed of tight lines.
すなわち、ペイオフリール２で巻き出された鋼帯４は先
行鋼帯６と溶接装置８にて溶接され、入側ルーパーＩＯ
を経由して連続焼鈍炉１２に入り連続焼鈍された後、出
側ルーパー１４を経由してシャー１６にて切断され、テ
ンションリール１８にて製品コイルとして巻取られる。That is, the steel strip 4 unwound by the payoff reel 2 is welded to the preceding steel strip 6 by the welding device 8, and the steel strip 4 is welded to the preceding steel strip 6 by the welding device 8.
After passing through the continuous annealing furnace 12 and being continuously annealed, the coil passes through the exit looper 14 and is cut by the shear 16, and is wound up as a product coil by the tension reel 18.
一般にステンレス鋼板の連続焼鈍炉には、第２図に示す
如く、加熱帯２０、均熱帯２２および冷却帯２４が連設
されている。Generally, a continuous annealing furnace for stainless steel sheets includes a heating zone 20, a soaking zone 22, and a cooling zone 24, as shown in FIG.
本発明による加熱帯２０、均熱帯２２についての温度制
御の実施例について説明する。An example of temperature control for the heating zone 20 and soaking zone 22 according to the present invention will be described.
ステンレス鋼帯４の進行方向に従って、加熱帯２０を２
０−Ａよ、２０−Ａ、、２Ｏ−Ａ３の温度ゾーンの異な
る３ゾーンに分割し、均熱帯２２も同様に２２−Ｂ、、
２２−Ｂ、、２２−Ｂ、の温度制御ゾーンに分割されて
いる。これらの各温度制御ゾーンは製品コイルが所定の
ヒートパターンで昇温するように与えられた設定炉温で
カスケード制御されている。According to the advancing direction of the stainless steel strip 4, the heating zone 20 is
0-A, 20-A, 2O-A3 are divided into three different temperature zones, and the soaking zone 22 is similarly 22-B.
It is divided into temperature control zones 22-B, , 22-B. Each of these temperature control zones is cascade-controlled at a set furnace temperature so that the product coil is heated in a predetermined heat pattern.
本発明によりダミー材を介在させる場合には、後行材が
製品材であるので、製品材を目標とするヒートパターン
Ａで昇温する時の炉温を、第３図に示す如く加熱帯では
θＡｓ、Ａ□＋ＱＡ３とし、均θ
熱帯の炉温をθ、□、θＢ□、θ。とすれば、ダミー材
、製品材の寸法およびライン速度が同一であれば、製品
材に比して放射率の高いダミー材は第３図に示す如く、
加熱帯で急激に板温か上昇するヒートパターンＢとなっ
た。従って加熱帯の前半においてはダミー材の方が炉温
を一定値に保つためには、ガス消費量が多いということ
になり、溶接部で製品材に切換った時には、この余分な
ガスが炉温の急激な上昇を招くことが判明した。When a dummy material is interposed according to the present invention, since the trailing material is the product material, the furnace temperature when the product material is heated in the target heat pattern A is set in the heating zone as shown in FIG. Let θAs, A□+QA3, and equal θ.The tropical furnace temperature is θ, □, θB□, θ. If the dimensions and line speed of the dummy material and product material are the same, then the dummy material has a higher emissivity than the product material, as shown in Figure 3.
Heat pattern B was obtained in which the plate temperature rapidly increased in the heating zone. Therefore, in the first half of the heating zone, the dummy material consumes more gas in order to maintain the furnace temperature at a constant value, and when switching to the product material at the welding part, this excess gas is absorbed into the furnace. It was found that this caused a sudden rise in temperature.
そこで１本発明では、ダミー材通板時は一時フイードバ
ック制御を切り固定し、ダミー材への熱投入量と製品材
への熱投入量の差と、ダミー材と製品材との熱負荷の差
により決る係数との積を燃料の制御ループに加えるフィ
ードフォワードＩＩＩ御を行い、ダミー材通過後にフィ
ードバック制御に戻す方法をとった。Therefore, in the present invention, when passing the dummy material, the feedback control is temporarily turned off and fixed, and the difference between the amount of heat input to the dummy material and the amount of heat input to the product material, and the difference in the heat load between the dummy material and the product material, are A method was adopted in which feedforward III control was performed in which the product of the coefficient determined by
この方法によりダミー材から製品材への切換わりにおい
ても、製品材通板時の炉の異常高温が防止され、製品材
の最適温度による焼鈍が可能となった。With this method, even when switching from dummy material to product material, abnormally high temperatures in the furnace during passing of the product material can be prevented, and the product material can be annealed at the optimum temperature.
〔発明の効果〕 本発明は、ステンレス鋼帯の連続焼鈍において。〔Effect of the invention〕 The present invention relates to continuous annealing of stainless steel strips.
著しく焼鈍条件の異なる後行鋼帯の焼鈍時に、先行鋼帯
と後行鋼帯の間にダミー材を介在させ、ダミー材通板時
にはフィードバック制御を固定し、ダミー材への熱投入
量と製品材への熱投入量との差と、両者の熱負荷の差に
より決まる係数との積を燃料の制御ループに加えるフィ
ードフォワード制御を行ない、ダミー材通過後にフィー
ドバック制御に戻す方法をとったので、ダミー材から製
品材への切換わり点においても、異常高温をもたらすこ
となく、製品材を最適温度にて焼鈍することができる効
果を挙げることができた。When annealing trailing steel strips with significantly different annealing conditions, a dummy material is interposed between the leading steel strip and the trailing steel strip, and feedback control is fixed when passing the dummy material, thereby controlling the amount of heat input to the dummy material and the product. We performed feedforward control that adds the product of the difference between the amount of heat input to the material and a coefficient determined by the difference in heat load between the two to the fuel control loop, and then returned to feedback control after passing through the dummy material. Even at the point of transition from dummy material to product material, the product material could be annealed at the optimum temperature without causing abnormally high temperatures.
第１図は本発明の実施例の施行に使用した連続焼鈍炉の
各装置の配置を示す模式断面図、第２図は連続焼鈍炉の
加熱区分を示す模式断面図、第３図は連続焼鈍炉の加熱
帯、均熱帯における炉温と。
ダミー材および製品材の板温の変化を示すヒートパター
ン例を示す線図である。Fig. 1 is a schematic sectional view showing the arrangement of each device in a continuous annealing furnace used in the embodiment of the present invention, Fig. 2 is a schematic sectional view showing the heating sections of the continuous annealing furnace, and Fig. 3 is a continuous annealing furnace. Furnace temperature in the heating zone and soaking zone of the furnace. FIG. 3 is a diagram showing an example of a heat pattern showing changes in plate temperature of a dummy material and a product material.
Claims (1)
わり点においてダミー材を挿入し板情報および各ゾーン
の出口、入口の板温ならびに板温目標値に基づいて最適
加熱条件を設定するフイードフオワード制御と、炉温も
しくは板温偏差に応じて加熱条件を変更するフィードバ
ック制御とを併用する炉温制御方法において、前記ダミ
ー材の先端が焼鈍炉に突入すると同時にフィードバック
制御を固定し前記ダミー材への熱投入量と製品材への熱
投入量との差と、前記ダミー材と製品材との同一炉温条
件下でのヒートパターンの差異に基づく熱負荷の差によ
り決まる係数の積を燃料の制御ループに加えたフイード
フオワード制御を行ない、前記ダミー材通過後にフィー
ドバック制御に戻すことを特徴とする連続焼鈍炉の炉温
制御方法。(1) Insert a dummy material at the switching point of the passing plate during continuous annealing of stainless steel strip, and set the optimal heating conditions based on the plate information, the plate temperature at the outlet and inlet of each zone, and the plate temperature target value. In a furnace temperature control method that uses a combination of feedforward control to change the heating conditions according to the furnace temperature or plate temperature deviation, the feedback control is fixed at the same time as the tip of the dummy material enters the annealing furnace. A coefficient determined by the difference in heat load based on the difference between the amount of heat input to the dummy material and the amount of heat input to the product material, and the difference in heat pattern between the dummy material and the product material under the same furnace temperature condition. 1. A furnace temperature control method for a continuous annealing furnace, characterized in that feedforward control is performed by adding the product of the above to a fuel control loop, and the feedback control is returned to after the dummy material has passed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31736789A JP2897134B2 (en) | 1989-12-06 | 1989-12-06 | Furnace temperature control method for continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31736789A JP2897134B2 (en) | 1989-12-06 | 1989-12-06 | Furnace temperature control method for continuous annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03177519A true JPH03177519A (en) | 1991-08-01 |
| JP2897134B2 JP2897134B2 (en) | 1999-05-31 |
Family
ID=18087455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31736789A Expired - Lifetime JP2897134B2 (en) | 1989-12-06 | 1989-12-06 | Furnace temperature control method for continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2897134B2 (en) |
-
1989
- 1989-12-06 JP JP31736789A patent/JP2897134B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2897134B2 (en) | 1999-05-31 |
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