JPH10330826A - Method for controlling molten metal temperature - Google Patents
Method for controlling molten metal temperatureInfo
- Publication number
- JPH10330826A JPH10330826A JP9140526A JP14052697A JPH10330826A JP H10330826 A JPH10330826 A JP H10330826A JP 9140526 A JP9140526 A JP 9140526A JP 14052697 A JP14052697 A JP 14052697A JP H10330826 A JPH10330826 A JP H10330826A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- molten metal
- temp
- temperature drop
- furnace
- 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.)
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- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば、鋼板、鋼
管等の素材となる鋼塊を製造する製鋼プロセスにおける
製鋼炉での処理終了時の溶鋼、即ち溶湯の温度を適正温
度に保つために実施する溶湯温度管理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a method for maintaining the temperature of molten steel, that is, the temperature of molten metal at the end of processing in a steelmaking furnace in a steelmaking process for producing steel ingots, such as steel plates and steel pipes, at an appropriate temperature. The present invention relates to a method for controlling the temperature of molten metal to be performed.
【０００２】[0002]
【従来の技術】製鋼プロセスでは、転炉、電気炉等の製
鋼炉にて溶製された溶鋼を、この製鋼炉内の一部に開口
する出鋼口を経て取鍋に出鋼し、所定の経路に沿って搬
送した後、連続鋳造設備または造塊設備の鋳型に注湯す
る。このような製鋼プロセスの操業において、注湯温度
が不適当である場合、鋳片の表面疵、内部欠陥等の品質
低下を引き起こす。従って、高品質の製品鋼塊を効率的
に得るためには、製鋼炉の処理終了時の溶鋼の温度を適
正に保つことが重要である。2. Description of the Related Art In a steelmaking process, molten steel produced in a steelmaking furnace such as a converter furnace or an electric furnace is tapped into a ladle through a tapping opening opening in a part of the steelmaking furnace. And then poured into a mold of a continuous casting facility or ingot making facility. In the operation of such a steelmaking process, if the pouring temperature is inappropriate, quality deterioration such as surface flaws and internal defects of the slab is caused. Therefore, in order to efficiently obtain a high-quality product steel ingot, it is important to appropriately maintain the temperature of the molten steel at the end of the steelmaking furnace treatment.
【０００３】そのため、製鋼プロセスの操業にあたっ
て、製鋼炉における出鋼から鋳型への注湯までに生じる
溶鋼の温度降下を推定し、鋳型に注湯した溶鋼の凝固温
度から求められる要求温度に、推定した温度降下量を加
算することにより、製鋼炉での処理終了時の溶鋼温度目
標値を決定し、得られた温度目標値を達成すべく吹錬制
御を実施することにより、製鋼プロセス全体の溶鋼温度
を管理する方法が採られている。[0003] Therefore, in the operation of the steelmaking process, the temperature drop of molten steel occurring from tapping in a steelmaking furnace to pouring into a mold is estimated, and the required temperature obtained from the solidification temperature of the molten steel poured into the mold is estimated. The target temperature at the end of the treatment in the steelmaking furnace is determined by adding the temperature drop amount obtained, and the blowing control is carried out to achieve the obtained temperature target value. A method of controlling the temperature is employed.
【０００４】ところが、前述の如く決定した製鋼炉での
処理終了時の溶鋼温度が吹錬制御により正しく実現され
た場合においても、鋳型への注湯時の溶鋼温度が凝固温
度から求められる要求温度に一致しないことがあり、製
品の品質を確保することが困難になる。また注湯時の温
度が必要以上の温度である場合には取鍋の耐火物の損傷
が早まって生産性が低下し、また必要温度に達していな
い場合は、昇温の工程が必要となって生産性が低下す
る。以上のように溶鋼温度が要求温度と一致しない原因
は、製鋼プロセスで生じる溶鋼の温度降下量が正確に把
握されていないことにある。[0004] However, even when the molten steel temperature at the end of the treatment in the steelmaking furnace determined as described above is correctly realized by the blowing control, the molten steel temperature at the time of pouring into the mold is a required temperature obtained from the solidification temperature. And it may be difficult to ensure product quality. Also, if the temperature at the time of pouring is higher than necessary, the refractory of the ladle will be damaged prematurely, reducing productivity.If the temperature has not reached the required temperature, a heating process will be required. Productivity is reduced. As described above, the reason why the molten steel temperature does not match the required temperature is that the amount of temperature drop of the molten steel generated in the steel making process is not accurately grasped.
【０００５】製鋼プロセスで生じる溶鋼の温度降下量を
把握した溶湯温度管理方法が、従来技術として特開平１
−２４６３１３号公報、特開平１−１６１１６１号公報
に開示されている。特開平１−２４６３１３号公報に開
示された方法は、溶鋼を受鋼して搬送する取鍋に複数個
の熱電対を埋め込んで取鍋耐火物の平均温度を求めるこ
とにより蓄熱量を判定し、その蓄熱量より出鋼により生
じる溶鋼の温度降下量を推定し、製鋼炉の処理終了時の
目標温度を補正する方法である。A method for managing the temperature of molten metal, which grasps the amount of temperature drop of molten steel generated in the steel making process, is disclosed in Japanese Patent Laid-Open Publication No. Hei.
-246313 and JP-A-1-161161. The method disclosed in Japanese Patent Application Laid-Open No. 1-246313 is to determine the amount of heat storage by embedding a plurality of thermocouples in a ladle that receives and transports molten steel and obtains the average temperature of the ladle refractory, This is a method of estimating the temperature drop of molten steel caused by tapping from the heat storage amount and correcting the target temperature at the end of the steelmaking furnace processing.
【０００６】特開平３−１６１１６１号公報に開示され
た方法は、取鍋の内壁耐火物の表面温度を放射温度計等
の温度計にて測定し、測定結果から取鍋の蓄熱量を求
め、鋳型への鋳込みまでのプロセスにおける吸熱量、放
熱量を逐次算出し、鋳型への注湯時の溶鋼温度を適正化
するために必要な目標温度を決定するものである。The method disclosed in Japanese Patent Application Laid-Open No. Hei 3-161161 measures the surface temperature of the refractory on the inner wall of the ladle with a thermometer such as a radiation thermometer, and obtains the heat storage amount of the ladle from the measurement result. The amount of heat absorption and the amount of heat radiation in the process up to casting into the mold are sequentially calculated, and the target temperature required to optimize the molten steel temperature at the time of pouring into the mold is determined.
【０００７】[0007]
【発明が解決しようとする課題】ところが、第１の方法
では、複数個の取鍋全てに熱電対を埋設する必要があ
り、埋設作業が煩雑になり多大なコストが必要となるの
で実用的ではない。また、製鋼炉の処理終了時の目標温
度を設定するという観点からは、熱電対の測温結果を直
接利用できないという不備がある。However, in the first method, it is necessary to embed thermocouples in all of the plurality of ladles, and the embedding work becomes complicated and a large cost is required. Absent. Further, from the viewpoint of setting the target temperature at the end of the steelmaking furnace processing, there is a defect that the temperature measurement result of the thermocouple cannot be directly used.
【０００８】また、第２の方法においては、煩雑な熱電
対の埋設作業がなく実施が容易である利点はあるもの
の、予熱される前の取鍋の内壁耐火物の表面温度測定値
のみに頼った温度管理であるため、多数の要因が影響す
る溶鋼の温度降下量の推定においては、ばらつきが大き
く推定結果の精度が低いという問題がある。In the second method, although there is an advantage that it is easy to carry out without a complicated work of burying a thermocouple, the method relies only on the measured surface temperature of the refractory on the inner wall of the ladle before being preheated. In the estimation of the temperature drop of molten steel, which is affected by many factors, there is a problem that the dispersion is large and the accuracy of the estimation result is low.
【０００９】本発明はこのような問題点を解決するため
になされたものであって、例えば製鋼炉から取鍋のよう
な搬送容器で搬送する間の溶湯の温度降下に多大な影響
を与える、製鋼炉、取鍋等の耐火物の溶損状況が、温度
降下量の推定値と実測値との差分をもたらすと考え、ま
た製鋼炉、取鍋の補修前と補修後とではこの差分が変化
するので、この差分、差分の変化を温度降下量を推定す
る演算式に組み込むことにより、製鋼炉、取鍋のそれぞ
れの補修状況、溶損状況に応じた溶鋼の温度降下量を精
度良く推定し、鋳型への注湯時における溶湯温度を容易
に適正温度に保ち、製品鋳塊の品質及び生産性を向上さ
せる溶湯温度管理方法の提供を目的とする。The present invention has been made in order to solve such a problem, and has a great effect on a temperature drop of a molten metal during a transfer from a steelmaking furnace to a transfer container such as a ladle. It is thought that the state of erosion of refractories such as steelmaking furnaces and ladles causes a difference between the estimated value and the measured value of the temperature drop, and this difference changes before and after repairing the steelmaking furnace and ladles. Therefore, by incorporating the difference and the change of the difference into an arithmetic expression for estimating the temperature drop, the temperature drop of the molten steel in accordance with the repair status of the steelmaking furnace and the ladle and the meltdown status can be accurately estimated. It is another object of the present invention to provide a method for controlling the temperature of a molten metal that easily maintains the temperature of the molten metal at the time of pouring into a mold and improves the quality and productivity of a product ingot.
【００１０】[0010]
【課題を解決するための手段】第１発明の溶湯温度管理
方法は、炉から出湯された溶湯を搬送容器で次工程へ運
搬する間の溶湯の温度降下量を推定し、該次工程におけ
る溶湯の温度が所定温度となるように前記炉から出湯さ
れる溶湯の出湯温度を管理すべく、前記搬送容器での運
搬による溶湯の温度降下量の推定値を算出し、また実測
し、前記炉及び／又は前記搬送容器に固有の要因により
生じた差分とみなし、溶湯の温度降下量の次回の推定に
おける推定値を、温度降下量の推定値と実測値との差分
により補正して該次回の推定値とする。According to a first aspect of the present invention, there is provided a method for controlling a temperature of a molten metal, which estimates an amount of temperature drop of the molten metal during transport of the molten metal discharged from the furnace to a next process in a transport container, and performs the process in the next process. In order to manage the tapping temperature of the molten metal discharged from the furnace so that the temperature of the furnace becomes a predetermined temperature, an estimated value of the temperature drop amount of the molten metal due to transportation in the transport container is calculated and measured, and the furnace and the furnace are measured. And / or assuming that the difference is caused by a factor peculiar to the transport container, and corrects the estimated value in the next estimation of the temperature drop of the molten metal by the difference between the estimated value of the temperature drop and the actually measured value. Value.
【００１１】従って、第１発明の溶湯温度管理方法は、
溶湯温度の降下に多大な影響を与える、製鋼炉及び搬送
容器のそれぞれの溶損状況に応じて生じる温度降下量の
推定値と実測値との差分で推定値を補正するので、溶湯
の温度降下量を高精度に推定し、製鋼炉の出湯時の溶湯
温度を、次工程における溶湯の温度がその工程に適した
温度となるように管理することができる。Therefore, the method for controlling the temperature of molten metal according to the first invention is as follows.
Since the estimated value is corrected by the difference between the estimated value and the measured value of the amount of temperature drop that occurs in accordance with the respective melting conditions of the steelmaking furnace and the transfer vessel, which greatly affects the temperature drop of the molten metal, the temperature drop of the molten metal The amount can be estimated with high accuracy, and the temperature of the molten metal at the time of tapping the steelmaking furnace can be managed so that the temperature of the molten metal in the next step is a temperature suitable for that step.
【００１２】第２発明の溶湯温度管理方法は、さらに、
前記炉及び前記搬送容器の補修前の前記差分と、補修後
の前記差分との変化量を記憶しておき、前記炉及び前記
搬送容器の次回の補修後に、搬送容器での運搬による溶
湯の温度降下量を推定する際、記憶している変化量に基
づいて温度降下量の推定値を補正する。[0012] The method for controlling the temperature of molten metal according to the second invention further comprises:
The difference between the difference before the repair of the furnace and the transfer container and the difference between the difference after the repair are stored, and after the next repair of the furnace and the transfer container, the temperature of the molten metal due to transportation in the transfer container. When estimating the drop amount, the estimated value of the temperature drop amount is corrected based on the stored change amount.
【００１３】従って、第２発明の溶湯温度管理方法は、
溶湯温度の降下に多大な影響を与える、製鋼炉及び搬送
容器のそれぞれの補修状況に応じて生じる温度降下量の
推定値と実測値との差分で推定値を補正するので、溶湯
の温度降下量を高精度に推定し、製鋼炉の出湯時の溶湯
温度を、次工程における溶湯の温度がその工程に適した
温度となるように管理することができる。Therefore, the method for controlling the temperature of molten metal according to the second invention is as follows.
Since the estimated value is corrected by the difference between the estimated value and the measured value of the temperature drop generated according to the repair condition of the steelmaking furnace and the transport vessel, which greatly affects the drop of the molten metal temperature, the temperature drop of the molten metal Can be estimated with high accuracy, and the temperature of the molten metal at the time of tapping the steelmaking furnace can be managed so that the temperature of the molten metal in the next step becomes a temperature suitable for that step.
【００１４】[0014]
【発明の実施の形態】以下に、本発明を実施する具体的
な方法について説明する。図１は本発明の溶湯温度管理
方法（以下、本発明方法という）を実施する製鋼プロセ
ス（連続鋳造プロセス）の模式図である。複数の転炉
（転炉番号１、２）で溶製された溶融状態の鋼は、プロ
セスにおいて循環使用される複数の取鍋（取鍋番号１〜
６）のいずれかに出鋼される。取鍋は鋼板の外殻の内面
に耐火物が内張りされ、底部には適宜内径のノズルが取
り付けられており、転炉から出鋼された溶鋼を受け、こ
れを二次精錬装置を経て連続鋳造機まで運搬し、ノズル
の開成により連続鋳造機に溶湯を注入する。なお、本例
では、演算式により推定した温度降下量を補正する目的
で、転炉からの出鋼直後、二次精錬装置の直前、及び連
続鋳造機の直前の３箇所で溶湯の温度降下量を計測する
ものとする。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific method for carrying out the present invention will be described. FIG. 1 is a schematic diagram of a steelmaking process (continuous casting process) for implementing a molten metal temperature management method (hereinafter, referred to as the present invention method) of the present invention. The molten steel melted in a plurality of converters (converter numbers 1 and 2) is used in a plurality of ladles (ladle numbers 1 to 1) circulated in the process.
6) Steel is produced. The ladle has a refractory lining on the inner surface of the outer shell of the steel plate, and a nozzle with an appropriate inside diameter is attached to the bottom at the bottom. The molten metal is poured into the continuous casting machine by opening the nozzle. In this example, in order to correct the temperature drop amount estimated by the arithmetic expression, the temperature drop amount of the molten metal at three points immediately after tapping from the converter, immediately before the secondary refining device, and immediately before the continuous casting machine. Shall be measured.
【００１５】転炉、電気炉等の製鋼炉は、使用を重ねる
毎に内壁の耐火物が溶損するため、他の操業条件が同じ
である場合においても溶鋼の温度降下量が同一であると
は限らない。即ち、製鋼炉の内壁耐火物の溶損状況、補
修状況により、出鋼時に生じる溶鋼の温度降下には差異
が生じる。しかし、製鋼炉の内壁耐火物の溶損状況を測
定することは非常に困難である。In a steelmaking furnace such as a converter or an electric furnace, the refractory on the inner wall is melted and damaged each time the furnace is used. Therefore, even if other operating conditions are the same, it is considered that the temperature drop of the molten steel is the same. Not exclusively. That is, the temperature drop of the molten steel at the time of tapping differs depending on the state of melting and repair of the refractory on the inner wall of the steelmaking furnace. However, it is very difficult to measure the state of erosion of the refractory on the inner wall of the steelmaking furnace.
【００１６】そこで、本発明の溶湯温度管理方法では、
製鋼炉が連続的に使用されている点に着目し、溶鋼温度
降下量の演算式による推定値と実測値との差分を次回以
降の演算に反映することで、製鋼炉の内壁耐火物の溶損
状況あるいは補修状況により生じる温度降下量の変化を
演算に取り込むものである。Therefore, in the method for controlling the temperature of molten metal of the present invention,
Focusing on the fact that the steelmaking furnace is used continuously, the difference between the estimated value by the formula for calculating the temperature drop of the molten steel and the actually measured value is reflected in the calculation from the next time onwards, and the melting of the refractory on the inner wall of the steelmaking furnace is performed. The change in the temperature drop caused by the loss situation or the repair situation is taken into the calculation.
【００１７】また、溶鋼を受鋼する取鍋は、複数個が循
環利用されるという操業上の制約があること、たとえ材
質が同じである場合においても取鍋毎に内壁耐火物の溶
損状況が異なること等により、搬送時に生じる溶鋼の温
度降下量に差異が生じる。そこで、使用する取鍋毎に、
演算式により算出された温度降下量推定値と実測値との
差異を、同じ取鍋を使用する次回の搬送時の演算にフィ
ードバックすることにより、取鍋毎の内壁耐火物の溶損
状況を演算に取り込むことができる。Further, there is a restriction in operation that a plurality of ladles receiving molten steel are circulated and used. Even if the ladles are of the same material, the state of erosion of the refractory on the inner wall is different for each ladle. , Etc., the temperature drop of the molten steel caused at the time of conveyance causes a difference. So, for each ladle used,
By calculating the difference between the estimated value of temperature drop calculated by the formula and the measured value and feeding it back to the next calculation using the same ladle, the erosion status of the inner wall refractory for each ladle is calculated. Can be captured.
【００１８】また、取鍋内壁耐火物の補修時には、補修
状況により生じた温度降下量の変化で次回の補修時の演
算をフィードフォワード補正することにより、補修直後
の当該取鍋を使用する場合に取鍋内壁耐火物の補修状況
を演算に取り込むことができる。これらの演算に必要と
なる実測値及び演算式による推定値はファイルに記録し
ておき、必要な演算時に随時利用できることとした。Further, when repairing the refractory on the inner wall of the ladle, the calculation at the time of the next repair is feed-forward corrected based on a change in the amount of temperature drop caused by the repair condition, so that the ladle immediately after the repair is used. The repair condition of the ladle inner wall refractory can be taken into the calculation. The measured values required for these calculations and the estimated values based on the calculation formulas are recorded in a file, and can be used at any time during the necessary calculations.
【００１９】以下に、本発明方法の手順を図２のフロー
チャート及び具体的な演算式を基に説明する。製鋼プロ
セスにおける温度降下量の演算式は次式で示される（ス
テップＳ１〜Ｓ３）。 ΔTe＝ΔT1e ＋ΔT2e ＋ΔT3e ただし、 ΔTe ：製鋼プロセスで生じる温度降下量推定値 ΔT1e ：製鋼炉からの出鋼時に生じる温度降下量推定値 ΔT2e ：取鍋による運搬時（二次精錬装置まで）に生じ
る温度降下量推定値 ΔT3e ：二次精錬装置から連続鋳造機までに生じる温度
降下量推定値Hereinafter, the procedure of the method of the present invention will be described based on the flowchart of FIG. 2 and specific arithmetic expressions. The equation for calculating the amount of temperature drop in the steelmaking process is represented by the following equation (steps S1 to S3). ΔTe = ΔT1e + ΔT2e + ΔT3e where ΔTe: Estimated value of temperature drop generated during steelmaking process ΔT1e: Estimated value of temperature drop generated during tapping from steelmaking furnace ΔT2e: Temperature generated during transportation by ladle (to secondary refining device) Estimated drop ΔT3e: Estimated temperature drop generated from secondary refining equipment to continuous casting machine
【００２０】フィードバックによる温度降下量補正式を
以下に示す（ステップＳ４〜Ｓ６）。製鋼炉毎のフィー
ドバックとしてΔT1fb、取鍋毎のフィードバックとして
ΔT2fb及びΔT3fbを考える。製鋼炉及び取鍋毎の溶損状
況の相違を次回以降、この製鋼炉あるいはこの取鍋を使
用する場合の計算にフィードバックするため、使用する
製鋼炉の個体数分のフィードバック係数を有することと
する。 ΔTfb ＝ΔT1fb＋ΔT2fb＋ΔT3fb ΔT1fb,i＝ΔT1fb,i-1＋α×｛Δ T1a,i-1−（Δ T1e
,i-1＋ΔT1fb,i-1）｝ ΔT2fb,i＝ΔT2fb,i-1＋β×｛Δ T2a,i-1−（Δ T2e
,i-1＋ΔT2fb,i-1）｝ ΔT3fb,i＝ΔT3fb,i-1＋γ×｛Δ T3a,i-1−（Δ T3e
,i-1＋ΔT3fb,i-1）｝The equation for correcting the amount of temperature drop by feedback is shown below (steps S4 to S6). Consider ΔT1fb as feedback for each steelmaking furnace and ΔT2fb and ΔT3fb as feedback for each ladle. In order to feed back the difference in the erosion status between the steelmaking furnace and the ladle to the calculation in the case of using this steelmaking furnace or this ladle from the next time onward, it shall have a feedback coefficient for the number of steelmaking furnaces used. . ΔTfb = ΔT1fb + ΔT2fb + ΔT3fb ΔT1fb , i = ΔT1fb, i-1 + α × {Δ T1a, i-1 - (Δ T1e
, i-1 + ΔT1fb, i -1)} ΔT2fb, i = ΔT2fb, i-1 + β × {Δ T2a, i-1 - (Δ T2e
, i-1 + ΔT2fb , i-1 )｝ ΔT3fb , i = ΔT3fb , i-1 + γ × ｛ΔT3a , i-1− (ΔT3e
, i-1 + ΔT3fb , i-1 )｝
【００２１】ただし、 ΔTfb ：フィードバックによる温度降下量補正値 ΔT1fb：製鋼炉からの出鋼時に生じる温度降下量補正値 ΔT2fb：取鍋による運搬時（二次精錬装置まで）に生じ
る温度降下量補正値 ΔT3fb：二次精錬装置から連続鋳造機までに生じる温度
降下量補正値 ΔTa ：製鋼プロセスで生じる温度降下量実測値 ΔT1a ：製鋼炉からの出鋼時に生じる温度降下量実測値 ΔT2a ：取鍋による運搬時（二次精錬装置まで）に生じ
る温度降下量実測値 ΔT3a ：二次精錬装置から連続鋳造機までに生じる温度
降下量実測値 α、β、γ：係数 添え字ｉは、温度測定時を表す。Where ΔTfb: correction value for temperature drop due to feedback ΔT1fb: correction value for temperature drop generated when tapping from a steelmaking furnace ΔT2fb: correction value for temperature drop generated during transportation by ladle (up to the secondary refining device) ΔT3fb: Correction value of temperature drop generated from secondary refining equipment to continuous casting machine ΔTa: Measured value of temperature drop generated in steel making process ΔT1a: Measured value of temperature drop generated during tapping from steelmaking furnace ΔT2a: Transport by ladle Actual measured value of temperature drop occurring at the time (up to the secondary refining device) ΔT3a: Actual measured value of temperature drop generated from the secondary refining device to the continuous casting machine α, β, γ: Coefficient Subscript i represents the time of temperature measurement .
【００２２】同様に、フィードフォワードによる温度降
下量補正値の補正式を以下に示す（ステップＳ７〜Ｓ
９）。各フィードフォワード項は、製鋼炉及び取鍋の補
修状況及び耐火物の溶損状況に応じて生じる、製鋼炉の
補修時及び取鍋の補修時の溶鋼温度降下量の実績値と推
定値との差の変化量をもとに学習することとし、実績値
と推定値との差の補修前後の変化量から算出することと
する。Similarly, the correction formula of the correction value of the temperature drop amount by the feed forward is shown below (steps S7 to S7).
9). Each feed-forward term is a comparison between the actual and estimated values of the temperature drop of molten steel at the time of steelmaking furnace repairs and ladle repairs that occur depending on the repair status of steelmaking furnaces and ladles and the erosion of refractories. The learning is performed based on the amount of change in the difference, and is calculated from the amount of change before and after the repair of the difference between the actual value and the estimated value.
【００２３】即ち、今回のフィードワード補正では、今
回の補修前の推定値と実測値との差に、前回のフィード
フォワード補正において生じた、補修前の推定値と実績
値との差と、補修後の推定値と実績値との差との変化量
が加わった差が生じるはずであるので、今回の補修直前
の推定値と実績値との差に変化量を加算した値を、今回
のフィードフォワード補正値から予め差し引いて、今回
のフィードフォワード補正により生じ得る差をゼロにし
ようとするものである。このフィードフォワード補正
は、補修直後に行うものであり、それ以外の場合はΔTf
f ＝０とする。That is, in the present feed word correction, the difference between the estimated value before repair and the actual measurement value, the difference between the estimated value before repair and the actual value generated in the previous feed forward correction, and the repair The difference between the estimated value and the actual value will be added to the difference between the estimated value and the actual value. The difference which may be caused by the current feedforward correction is reduced to zero by subtracting it from the forward correction value in advance. This feed-forward correction is performed immediately after the repair, otherwise ΔTf
Let f = 0.
【００２４】ΔTff ＝ΔT1ff＋ΔT2ff＋ΔT3ff ΔT1ff,m＝ΔT1ff,m-1−［k1×｛（Δ T1a,j-1−Δ T1e
,j-1）｝＋k1×｛（Δ T1a,i−Δ T1e,i）−（Δ T1a
,i-1−Δ T1e,i-1）｝］ ΔT2ff,m＝ΔT2ff,m-1−［k2×｛（Δ T2a,j-1−Δ T2e
,j-1）｝＋k2×｛（Δ T2a,i−Δ T2e,i）−（Δ T2a
,i-1−Δ T2e,i-1）｝］ ΔT3ff,m＝ΔT3ff,m-1−［k3×｛（Δ T3a,j-1−Δ T3e
,j-1）｝＋k3×｛（Δ T3a,i−Δ T3e,i）−（Δ T3a
,i-1−Δ T3e,i-1）｝］ΔTff = ΔT1ff + ΔT2ff + ΔT3ff ΔT1ff , m = ΔT1ff , m−1− [k1 × ｛(ΔT1a , j−1− ΔT1e
, j-1)} + k1 × {(Δ T1a, i -Δ T1e, i) - (Δ T1a
, i-1 −Δ T1e , i-1 )｝] ΔT2ff , m = ΔT2ff , m-1 − [k2 × ｛(ΔT2a , j-1 −ΔT2e
, j-1)} + k2 × {(Δ T2a, i -Δ T2e, i) - (Δ T2a
, i-1 −Δ T2e , i-1 )｝] ΔT3ff , m = ΔT3ff , m-1 − [k3 × ｛(ΔT3a , j-1 −ΔT3e
, j-1 )｝ + k3 × ｛(ΔT3a , i− ΔT3e , i ) − (ΔT3a
, i-1 −Δ T3e , i-1 )｝
【００２５】ただし、 ΔTff ：フィードフォワードによる温度降下量補正値 ΔT1ff：製鋼炉からの出鋼時に生じる温度降下量補正値 ΔT2ff：取鍋による運搬時（二次精錬装置まで）に生じ
る温度降下量補正値 ΔT3ff：二次精錬装置から連続鋳造機までに生じる温度
降下量補正値 k1、k2、k3：係数 添え字ｉは前回の補修前後の温度測定時（補修直前ｉ−
１、補修直後ｉ）、添え字j-1 は、今回の補修前の温度
測定時、添え字ｍは、補修時を表す。Where ΔTff: correction value of temperature drop due to feed forward ΔT1ff: correction value of temperature drop generated when tapping from steelmaking furnace ΔT2ff: correction of temperature drop generated during transport by ladle (to secondary refining device) Value ΔT3ff: Correction value of temperature drop generated from secondary refining equipment to continuous casting machine k1, k2, k3: Coefficient Subscript i indicates the temperature measured before and after the last repair (i-
1. Immediately after the repair i), the suffix j-1 indicates the temperature measurement before the current repair, and the suffix m indicates the time of the repair.
【００２６】以上に示したフィードバック計算及びフィ
ードフォワード計算により補正を施した場合の製鋼プロ
セスにおける温度降下量の演算式を次式に示す（ステッ
プＳ１０）。本式をもとに最終的に溶鋼の温度降下量を
推定し、以降のプロセスで要求される溶鋼温度から、製
鋼炉での溶鋼温度目標値を決定する（ステップＳ１
１）。 ΔTef ＝ΔTe＋ΔTfb ＋ΔTff ＝ΔT1e ＋ΔT1fb＋ΔT1ff＋ΔT2e ＋ΔT2fb＋ΔT2ff＋
ΔT3e ＋ΔT3fb＋ΔT3ffThe equation for calculating the temperature drop in the steelmaking process when the correction is made by the above-described feedback calculation and feedforward calculation is shown in the following equation (step S10). The amount of temperature drop of the molten steel is finally estimated based on this equation, and the target value of the molten steel temperature in the steelmaking furnace is determined from the molten steel temperature required in the subsequent processes (step S1).
1). ΔTef = ΔTe + ΔTfb + ΔTff = ΔT1e + ΔT1fb + ΔT1ff + ΔT2e + ΔT2fb + ΔT2ff +
ΔT3e + ΔT3fb + ΔT3ff
【００２７】ただし、 ΔTef ：補正後製鋼プロセスで生じる温度降下量推定 また、補修直後ではなくフィードフォワード計算を行わ
ない場合はフィードフォワード計算部分は０とする。However, ΔTef: Estimation of the temperature drop generated in the steelmaking process after correction. Also, when the feedforward calculation is not performed immediately after the repair, the feedforward calculation portion is set to 0.
【００２８】[0028]
【実施例】連続鋳造機への注湯時点における溶鋼の温度
が、凝固温度から計算される適正温度に対して±１０℃
以内の誤差範囲に収まる確率は、従来の方法によった場
合は７５％前後である。これに対して、以上の如き本発
明方法を実際の製鋼プロセスにおいて実施した場合、適
正温度に対して±１０℃以内の誤差範囲に収まる確率は
８５％前後にまで達し、本発明方法の実施により±１０
℃以内の誤差範囲に収まる確率が大幅に向上することが
確かめられた。[Example] The temperature of molten steel at the time of pouring into a continuous casting machine is ± 10 ° C with respect to an appropriate temperature calculated from a solidification temperature.
The probability of falling within the error range is within about 75% according to the conventional method. On the other hand, when the method of the present invention as described above is implemented in an actual steelmaking process, the probability of falling within an error range of ± 10 ° C. with respect to an appropriate temperature reaches about 85%. ± 10
It was confirmed that the probability of falling within the error range within ° C was greatly improved.
【００２９】[0029]
【発明の効果】以上のように、第１の発明方法は、例え
ば製鋼炉から取鍋のような搬送容器で搬送する間の溶湯
の温度降下に多大な影響を与える、製鋼炉、取鍋等の耐
火物の溶損状況が、温度降下量の推定値と実測値との差
分をもたらすと考え、この差分を温度降下量を推定する
演算式に組み込むので、製鋼炉、取鍋のそれぞれの補修
状況、溶損状況に応じた溶鋼の温度降下量を精度良く推
定し、鋳型への注湯時における溶湯温度を容易に適正温
度に保ち、製品鋳塊の品質及び生産性を向上させるとい
う優れた効果を奏する。As described above, the first method of the present invention has a great effect on the temperature drop of the molten metal while being transferred from a steelmaking furnace to a transfer vessel such as a ladle, for example. Is considered to cause a difference between the estimated value of the temperature drop and the measured value, and this difference is incorporated in the calculation formula for estimating the temperature drop, so that the repair of the steelmaking furnace and the ladle, respectively, is performed. It accurately estimates the amount of temperature drop of molten steel according to the situation and erosion situation, easily maintains the molten metal temperature at the time of pouring into the mold, and improves the quality and productivity of the product ingot. It works.
【００３０】また第２の発明方法は、例えば製鋼炉から
取鍋のような搬送容器で搬送する間の溶湯の温度降下に
多大な影響を与える、製鋼炉、取鍋の補修前と補修後と
の温度降下量の推定値と実測値との差分の変化を温度降
下量を推定する演算式に組み込むので、製鋼炉、取鍋の
それぞれの補修状況、溶損状況に応じた溶鋼の温度降下
量を精度良く推定し、鋳型への注湯時における溶湯温度
を容易に適正温度に保ち、製品鋳塊の品質及び生産性を
向上させるという優れた効果を奏する。Further, the method of the second invention has a great effect on the temperature drop of the molten metal during the transfer from the steelmaking furnace to a transfer container such as a ladle, and has a great effect on before and after the repair of the steelmaking furnace and the ladle. Since the change in the difference between the estimated value of the temperature drop and the measured value is incorporated into the equation for estimating the temperature drop, the temperature drop of the steel Is accurately estimated, the temperature of the molten metal at the time of pouring into the mold is easily maintained at an appropriate temperature, and an excellent effect of improving the quality and productivity of the product ingot is exhibited.
【図１】本発明方法を実施する製鋼プロセスの模式図で
ある。FIG. 1 is a schematic view of a steel making process for carrying out the method of the present invention.
【図２】本発明方法の手順のフローチャートである。FIG. 2 is a flowchart of the procedure of the method of the present invention.
Claims (2)
程へ搬送する間の溶湯の温度降下量を推定し、前記次工
程における溶湯の温度が所定温度となるように前記炉か
ら出湯される溶湯の出湯温度を管理する方法において、 搬送容器での運搬による溶湯の温度降下量を推定し、ま
た実測し、 溶湯の温度降下量の次回の推定における推定値を、温度
降下量の推定値と実測値との差分により補正して該次回
の推定値とすることを特徴とする溶湯温度管理方法。1. A method for estimating a temperature drop of a molten metal discharged from a furnace while the molten metal is conveyed to a next step by a transfer container, and the molten metal is discharged from the furnace so that the temperature of the molten metal in the next step becomes a predetermined temperature. In the method of controlling the temperature of the molten metal, the amount of temperature drop of the molten metal due to transportation in a transport container is estimated and measured, and the estimated value in the next estimation of the temperature drop of the molten metal is used as the estimated value of the amount of temperature decrease. A molten metal temperature management method, wherein the estimated value is corrected by the difference between the measured value and the measured value.
差分と、補修後の前記差分との変化量を記憶しておき、 前記炉及び前記搬送容器の次回の補修後に、搬送容器で
の運搬による溶湯の温度降下量を推定する際、記憶して
いる変化量に基づいて温度降下量の推定値を補正する請
求項１記載の溶湯温度管理方法。2. The amount of change between the difference between the furnace and the transfer container before the repair and the difference after the repair is stored, and after the next repair of the furnace and the transfer container, 2. The method according to claim 1, wherein when estimating the temperature drop of the molten metal due to transportation, the estimated value of the temperature drop is corrected based on the stored change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9140526A JPH10330826A (en) | 1997-05-29 | 1997-05-29 | Method for controlling molten metal temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9140526A JPH10330826A (en) | 1997-05-29 | 1997-05-29 | Method for controlling molten metal temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10330826A true JPH10330826A (en) | 1998-12-15 |
Family
ID=15270725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9140526A Pending JPH10330826A (en) | 1997-05-29 | 1997-05-29 | Method for controlling molten metal temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10330826A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003268428A (en) * | 2002-03-08 | 2003-09-25 | Jfe Steel Kk | Apparatus for controlling quality of steel product |
| JP2007186762A (en) * | 2006-01-13 | 2007-07-26 | Kobe Steel Ltd | Operating method in producing process for steel and operating apparatus therefor |
| JP2009007631A (en) * | 2007-06-28 | 2009-01-15 | Jfe Steel Kk | Method for setting target temperature of ending blowing in converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055121A (en) * | 1991-06-21 | 1993-01-14 | Nisshin Steel Co Ltd | Method for controlling steel tapping temperature |
| JPH083621A (en) * | 1994-06-15 | 1996-01-09 | Nippon Steel Corp | Method for adjusting molten steel temperature in steelmaking process |
| JPH08197234A (en) * | 1995-01-27 | 1996-08-06 | Sumitomo Metal Ind Ltd | Method for controlling temperature of molten metal |
-
1997
- 1997-05-29 JP JP9140526A patent/JPH10330826A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055121A (en) * | 1991-06-21 | 1993-01-14 | Nisshin Steel Co Ltd | Method for controlling steel tapping temperature |
| JPH083621A (en) * | 1994-06-15 | 1996-01-09 | Nippon Steel Corp | Method for adjusting molten steel temperature in steelmaking process |
| JPH08197234A (en) * | 1995-01-27 | 1996-08-06 | Sumitomo Metal Ind Ltd | Method for controlling temperature of molten metal |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003268428A (en) * | 2002-03-08 | 2003-09-25 | Jfe Steel Kk | Apparatus for controlling quality of steel product |
| JP2007186762A (en) * | 2006-01-13 | 2007-07-26 | Kobe Steel Ltd | Operating method in producing process for steel and operating apparatus therefor |
| JP2009007631A (en) * | 2007-06-28 | 2009-01-15 | Jfe Steel Kk | Method for setting target temperature of ending blowing in converter |
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