JP6380510B2 - Heating furnace slab charging temperature prediction system and heating furnace slab charging temperature prediction method - Google Patents
Heating furnace slab charging temperature prediction system and heating furnace slab charging temperature prediction method Download PDFInfo
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Description
本発明は、製鉄所における熱間圧延工場の加熱炉へ装入するスラブの温度を予測する、加熱炉のスラブ装入温度予測システムに関するものである。 The present invention relates to a slab charging temperature prediction system for a heating furnace that predicts the temperature of the slab charged into the heating furnace of a hot rolling mill in an ironworks.
これまでの熱間圧延工場の加熱炉のスラブ装入温度は、連続鋳造機でトーチカットされて加熱炉に装入されるまでの経過時間に基づいて求めることが一般的であった。 Conventionally, the slab charging temperature of a heating furnace in a hot rolling mill has been generally determined based on the elapsed time from the torch cut by a continuous casting machine until charging into the heating furnace.
例えば、特許文献１では、連続鋳造機でトーチカットされる予定時刻から、このスラブが熱間圧延工場の加熱炉に装入する予定時刻までの経過時間に基づいた非線形回帰式を用いて、経過時間の間に生じる温度降下量を求める。そして、トーチカットされた時点でのスラブ温度から求めた温度降下量を差し引いて、スラブ装入温度としている。 For example, Patent Document 1 uses a non-linear regression equation based on the elapsed time from the scheduled time when the torch is cut by the continuous casting machine to the scheduled time when the slab is charged into the heating furnace of the hot rolling mill. Find the amount of temperature drop that occurs over time. And the temperature drop amount calculated | required from the slab temperature at the time of a torch cut is deducted, and it is set as the slab charging temperature.
特許文献１に開示の技術では、加熱炉での再加熱時の燃料費を削減する、連続鋳造−熱間圧延同期化操業（以下、ＤＨＣＲと称する）を前提としており、トーチカットされてから加熱炉に装入されるまでのスラブの移動方法の違いによる温度降下量の違いが考慮されていないという問題がある。 The technique disclosed in Patent Document 1 is based on the premise of a continuous casting-hot rolling synchronized operation (hereinafter referred to as DHCR) that reduces fuel costs during reheating in a heating furnace, and is heated after being torch cut. There is a problem that the difference in temperature drop due to the difference in the method of moving the slab until it is charged into the furnace is not taken into account.
すなわち、ＤＨＣＲではトーチカットから加熱炉までのスラブ搬送時間が短く、このスラブ搬送時間で加熱炉のスラブ装入温度を予測しても、実際のスラブ装入温度との誤差は小さいものの、トーチカットから加熱炉までの途中にスラブヤードでスラブを保管する場合では、加熱炉までの経過時間が長く、かつスラブヤードでの保管状況によって温度降下量は大きく異なってくる。 That is, in DHCR, the slab transfer time from the torch cut to the heating furnace is short, and even if the slab charging temperature of the heating furnace is predicted by this slab transfer time, the error with the actual slab charging temperature is small, but the torch cut In the case where the slab is stored in the slab yard in the middle from the heating furnace to the heating furnace, the elapsed time to the heating furnace is long, and the temperature drop varies greatly depending on the storage condition in the slab yard.
例えば、スラブヤードでのスラブ保管時間が同じであるとしても、スラブヤードで高温のスラブに挟まれた状態で山置きされていたスラブと、スラブ単体で外気温にさらされた状態で置かれていたスラブとでは、後者スラブの温度降下量が大きくなる。 For example, even if the slab storage time in the slab yard is the same, the slab that was placed between the slab yard and the high temperature slab and the slab alone was exposed to the outside temperature. With a slab, the temperature drop of the latter slab is large.
本発明は、このような従来の問題に鑑みてなされたものであり、製鉄所の熱間圧延工場におけるスラブの加熱炉への装入温度を、スラブヤードでのスラブ保管状況を考慮して精度よく予測することができる、加熱炉のスラブ装入温度予測システムを提供することを目的とする。 The present invention has been made in view of such a conventional problem, and the charging temperature of the slab in the hot rolling mill of the ironworks is considered to be accurate in consideration of the slab storage situation in the slab yard. An object of the present invention is to provide a slab charging temperature prediction system for a heating furnace that can be well predicted.
上記課題は、以下の発明によって解決できる。 The above problems can be solved by the following invention.
［１］ 製鉄所における熱間圧延工場の加熱炉へ装入するスラブの温度を予測する加熱炉のスラブ装入温度予測システムであって、
連続鋳造機で鋳造され、所定の長さにトーチカットされたスラブのトーチカット時刻および該時刻でのスラブ温度を保持する連続鋳造機操業実績データベースと、
スラブ毎の搬送計画およびスラブヤードでの山積み情報を保持するスラブ搬送計画データベースと、
前記トーチカット時刻、該時刻でのスラブ温度、前記スラブ毎の搬送計画、およびスラブヤードでの山積み情報を元に、スラブヤードでのスラブの温度推移を計算することによって、スラブの加熱炉装入温度を予測する加熱炉装入温度予測システムとを具備することを特徴とする加熱炉のスラブ装入温度予測システム。
[1] A slab charging temperature prediction system for a heating furnace for predicting a temperature of a slab charged into a heating furnace of a hot rolling mill in a steel mill,
A continuous casting machine operation result database that holds the torch cutting time of the slab cast by the continuous casting machine and torch cut to a predetermined length and the slab temperature at the time;
A slab transportation plan database that holds the transportation plan for each slab and the pile information at the slab yard;
Based on the torch cut time, the slab temperature at the time, the transport plan for each slab, and the pile information at the slab yard, the temperature transition of the slab at the slab yard is calculated to calculate the slab furnace charge. A slab charging temperature prediction system for a heating furnace, comprising a heating furnace charging temperature prediction system for predicting a temperature.
［２］ 上記［１］に記載の加熱炉のスラブ装入温度予測システムにおいて、
前記スラブヤードでのスラブの温度推移の計算にあたっては、
温度推移を計算するスラブの温度と、温度推移を計算するスラブの上側に置かれたスラブの温度あるいは温度推移を計算するスラブの上側にスラブが置かれていない場合には外気温との温度差、および、
温度推移を計算するスラブの温度と、温度推移を計算するスラブの下側に置かれたスラブの温度あるいは温度推移を計算するスラブの下側にスラブが置かれていない場合には外気温との温度差のそれぞれに基づき、温度推移を計算するスラブの温度降下量を計算することを特徴とする加熱炉のスラブ装入温度予測システム。
[2] In the heating furnace slab charging temperature prediction system according to [1] above,
In calculating the temperature transition of the slab at the slab yard,
Temperature difference between the temperature of the slab that calculates the temperature transition and the temperature of the slab placed above the slab that calculates the temperature transition, or the outside temperature if no slab is placed above the slab that calculates the temperature transition ,and,
The temperature of the slab that calculates the temperature transition and the temperature of the slab that is placed under the slab that calculates the temperature transition or the outside air temperature if there is no slab under the slab that calculates the temperature transition A slab charging temperature prediction system for a heating furnace, which calculates a temperature drop amount of a slab for calculating a temperature transition based on each temperature difference.
［３］ 上記［１］または［２］に記載の加熱炉のスラブ装入温度予測システムにおいて、
前記スラブヤードでのスラブの温度推移の計算にあたっては、
以下の（１）、（２）式を用いることを特徴とする加熱炉のスラブ装入温度予測システム。
[3] In the heating furnace slab charging temperature prediction system according to [1] or [2] above,
In calculating the temperature transition of the slab at the slab yard,
A slab charging temperature prediction system for a heating furnace using the following equations (1) and (2):
本発明により、製鉄所の熱間圧延工場におけるスラブの加熱炉への装入温度を精度よく予測することができるようになったので、加熱炉でのスラブ加熱制御がより精度良くできるようになる。また、熱間圧延スケジューリングシステムと連携することで、より高能率、低コストでの熱間圧延工場の操業が可能となる。 According to the present invention, it is possible to accurately predict the charging temperature of the slab into the heating furnace in the hot rolling mill of the ironworks, so that the slab heating control in the heating furnace can be performed with higher accuracy. . Also, by cooperating with the hot rolling scheduling system, it is possible to operate the hot rolling mill with higher efficiency and lower cost.
以下、図および式を参照しながら、本発明の説明を行う。図１は、本発明を適用する製鉄所の設備列の一例を説明する図である。図中、１は連続鋳造機、２はスラブ、３は山、４はスラブヤード、５は加熱炉、および６は熱間圧延機をそれぞれ表す。 Hereinafter, the present invention will be described with reference to the drawings and formulas. FIG. 1 is a diagram for explaining an example of an equipment row of an ironworks to which the present invention is applied. In the figure, 1 is a continuous casting machine, 2 is a slab, 3 is a mountain, 4 is a slab yard, 5 is a heating furnace, and 6 is a hot rolling mill.
連続鋳造機１で鋳造され、所定の長さにトーチカットされたスラブ２は、スラブヤード４と呼ばれる置場に、搬送設備(図示せず)で運ばれる。ここで、スラブ２は複数本重ねて置かれ、重ねて置かれたスラブの一固まりは山と呼ばれる。図１に見られるように、山３がスラブヤード４内に複数存在する。 The slab 2 cast by the continuous casting machine 1 and torch-cut to a predetermined length is transported to a place called a slab yard 4 by a transport facility (not shown). Here, a plurality of slabs 2 are laid on top of each other, and a lump of slabs placed on top of each other is called a mountain. As seen in FIG. 1, a plurality of mountains 3 exist in the slab yard 4.
熱間圧延工場の圧延計画により、スラブ毎の加熱炉３への装入時刻がスケジューリングされ、このスケジューリング結果に従ってスラブ２はスラブヤード４から加熱炉５に装入される。所定の圧延温度まで加熱されたスラブ２は、加熱炉５より抽出され熱間圧延機６により所定の厚さに圧延され、コイラー(図示せず)にて巻き取られてコイル状の鋼板となる。 According to the rolling plan of the hot rolling mill, the charging time into the heating furnace 3 for each slab is scheduled, and the slab 2 is charged into the heating furnace 5 from the slab yard 4 according to the scheduling result. The slab 2 heated to a predetermined rolling temperature is extracted from the heating furnace 5, rolled to a predetermined thickness by a hot rolling mill 6, and wound up by a coiler (not shown) to form a coiled steel plate. .
図２は、本発明を適用するシステム構成の一例を示す図である。図中、１０は連続鋳造機操業実績データベース、２０はスラブ搬送計画データベース、３０は加熱炉装入温度予測システム、および４０は熱間圧延スケジューリングシステムをそれぞれ表す。 FIG. 2 is a diagram showing an example of a system configuration to which the present invention is applied. In the figure, 10 represents a continuous caster operation performance database, 20 represents a slab transfer plan database, 30 represents a furnace charging temperature prediction system, and 40 represents a hot rolling scheduling system.
加熱炉装入温度予測システム３０は、連続鋳造機操業実績データベース１０より、トーチカット時刻とトーチカット時のスラブ温度を、スラブ搬送計画データベース２０よりスラブ毎の搬送計画とスラブヤードでの山積み情報を受け取り、それらの情報を元にスラブヤードでのスラブの温度推移を計算することによって、スラブの加熱炉装入温度をより正確に予測する。 The heating furnace charging temperature prediction system 30 obtains the torch cutting time and the slab temperature at the time of torch cutting from the continuous casting machine operation result database 10, and the transportation plan for each slab and the pile information at the slab yard from the slab transportation plan database 20. The temperature of the slab in the furnace is calculated more accurately by calculating the temperature transition of the slab at the slab yard based on the received information.
そして、予測されたスラブ毎の加熱炉装入温度は、熱間圧延スケジューリングシステム４０に送られ、加熱炉へのスラブ装入時刻や熱間圧延時刻などの計算に使用される。なお、加熱炉装入温度予測システム３０および熱間圧延スケジューリングシステム４０は、それぞれ別個のコンピュータで実現することも、また一つのコンピュータで違うモジュールとして実現することもできる。 And the heating furnace charging temperature for every estimated slab is sent to the hot rolling scheduling system 40, and is used for calculation, such as the slab charging time to a heating furnace, and hot rolling time. The heating furnace charging temperature prediction system 30 and the hot rolling scheduling system 40 can be realized by separate computers or as different modules by one computer.
加熱炉装入温度予測システム３０におけるスラブの加熱炉装入温度の予測計算にあたっては、スラブが、トーチカットされてからスラブヤードに搬送されるまで、およびスラブヤードから加熱炉に搬送されるまでの搬送時間については、特許文献１のようにそれぞれの搬送時間に基づいてスラブの温度降下量を求めるようにする。 In the prediction calculation of the heating furnace charging temperature of the slab in the heating furnace charging temperature prediction system 30, the slab is cut from the torch cut until it is transported to the slab yard and from the slab yard to the heating furnace. As for the conveyance time, the temperature drop amount of the slab is obtained based on the respective conveyance times as in Patent Document 1.
スラブがスラブヤードに到着した後の、スラブヤードでのスラブの温度推移については、以下に示す（１）、（２）式により計算する。 The temperature transition of the slab at the slab yard after the slab arrives at the slab yard is calculated by the following equations (1) and (2).
上記計算は、温度推移を計算するスラブの上下面からの熱伝達を考慮したものである。山積み状況（上下面に他のスラブがある場合またはない場合）を考慮し、上下面での温度差に基づいてスラブヤードに置かれたスラブの温度推移を予測する。 The above calculation considers heat transfer from the upper and lower surfaces of the slab for calculating the temperature transition. Considering the piled up situation (with or without other slabs on the top and bottom surfaces), predict the temperature transition of the slab placed in the slab yard based on the temperature difference between the top and bottom surfaces.
上記計算によって、加熱炉装入時刻よりスラブヤードから加熱炉への搬送にかかる時間を差し引いた時刻までのスラブ温度（スラブヤードから搬送時のスラブ温度）を求め、このスラブ温度から加熱炉への搬送にかかる時間での温度降下量を引いて、加熱炉へ装入するスラブの温度とする。 Based on the above calculation, the slab temperature from the time when the furnace is charged to the time obtained by subtracting the time required for conveyance from the slab yard to the furnace (the slab temperature during conveyance from the slab yard) is obtained. By subtracting the temperature drop during the time required for conveyance, the temperature of the slab charged into the heating furnace is obtained.
以上のように、製鉄所の熱間圧延工場におけるスラブの加熱炉への装入温度を精度よく予測することができるようになったので、加熱炉でのスラブ加熱制御がより精度良くできるようになる。また、熱間圧延スケジューリングシステムと連携することで、より高能率、低コストでの熱間圧延工場の操業が可能となる。 As described above, the charging temperature of the slab into the heating furnace in the hot rolling mill of the steel works can be accurately predicted, so that the slab heating control in the heating furnace can be performed with higher accuracy. Become. Also, by cooperating with the hot rolling scheduling system, it is possible to operate the hot rolling mill with higher efficiency and lower cost.
以下に、スラブヤードでのスラブ温度推移の一例を示す。図３は、本実施例におけるスラブヤードでの山積み状態の変化を示す図である。スラブ４本(スラブA、B、C、D)、スラブヤードに３つの山(山1、山2、山3)、時間刻みが１時間での時刻0. 0〜10. 0での山積み状態の変化例を示している。 Below, an example of slab temperature transition in a slab yard is shown. FIG. 3 is a diagram showing a change in the piled state at the slab yard in the present embodiment. Four slabs (slabs A, B, C, D), three slabs in the slab yard (mountain 1, mountain 2, mountain 3), piled up at time 0.0 to 10.0 in 1 hour increments An example of change is shown.
スラブAとBは時刻0. 0に、スラブCとDは時刻3. 0に、それぞれトーチカットされた後スラブヤードに到着している。スラブAとBは、到着時には山１の位置にスラブBの上にスラブAが積まれ、また、スラブCは、到着時には山１のスラブAの上に積まれ、さらに、スラブDは、到着時には山３の位置に単体で床置きされる。スラブヤード到着時の温度は全て900℃とする。 Slabs A and B arrive at the slab yard after being torch cut at time 0.0 and slabs C and D are at time 3.0, respectively. When slabs A and B arrive, slab A is stacked on slab B at the position of mountain 1, slab C is stacked on slab A of mountain 1 upon arrival, and slab D arrives Sometimes it is placed alone on the mountain 3 position. All temperatures on arrival at the slab yard shall be 900 ° C.
さらに時刻9. 0では、山1のスラブBの上に積まれていたスラブAとスラブCを、それぞれ山2と山3に移動する配置換えが行なわれていることを表している。 Furthermore, at time 9.0, it represents that the slab A and the slab C loaded on the slab B of the mountain 1 are moved to the mountain 2 and the mountain 3 respectively.
このときの、各スラブの温度変化は、前述した（１）、（２）式により計算される。例えば、時刻4. 0におけるスラブAの温度TA(4)は、図３で見るように山1でスラブB、Cに挟まれて積まれているので、時刻3. 0におけるスラブAの温度TA(3)、スラブCの温度TC(3)、およびスラブBの温度TB(3)を用いて、以下のように表される。 The temperature change of each slab at this time is calculated by the above-described equations (1) and (2). For example, the temperature TA (4) of the slab A at time 4.0 is stacked between the slabs B and C at the mountain 1 as seen in FIG. Using (3), the temperature TC (3) of the slab C, and the temperature TB (3) of the slab B, it is expressed as follows.
上記パラメータα、β、γは、α=0.09015、β=0.0883、γ=6.11とした。これは、例えば１か月分のスラブの加熱炉装入温度の実測値を用いて、予測誤差が最小となるように最小二乗法で同定することで求めることができる。また、この例では、外気温を50℃で設定した。 The parameters α, β, and γ were set to α = 0.09015, β = 0.0883, and γ = 6.11. This can be obtained by, for example, using the measured value of the heating furnace charging temperature of the slab for one month, and identifying by the least square method so that the prediction error is minimized. In this example, the outside air temperature was set to 50 ° C.
山積みの状態に即して、各スラブの各時刻での温度を順次求めていくことで、任意の時刻における各スラブの温度を予測することができる。 The temperature of each slab at an arbitrary time can be predicted by sequentially obtaining the temperature at each time of each slab in accordance with the state of piles.
図４は、本実施例におけるスラブ温度の時間推移結果を示す図である。図４（ａ）に計算結果を表形式で、図４（ｂ）にグラフ形式でそれぞれ示している。 FIG. 4 is a diagram showing the time transition result of the slab temperature in this example. FIG. 4A shows the calculation results in a table format, and FIG. 4B shows the calculation results in a graph format.
山積みの状態の違いにより、各スラブの温度変化に差が出ていることが分る。また、高温のスラブBとスラブCに挟まれていたスラブAの温度履歴が高く推移し、逆に単体で置かれていたスラブDの温度が低く推移していることが表現できている。 It can be seen that there is a difference in the temperature change of each slab due to the difference in the state of the pile. Moreover, it can be expressed that the temperature history of the slab A sandwiched between the high-temperature slab B and the slab C is high, and conversely, the temperature of the slab D that has been placed alone is low.
なお、本実施例ではスラブ４本、スラブヤード３山、１時間単位での予測結果例示したが、実際の適用では、スラブ本数が数千本、スラブヤードの山が数十、時間刻みは１分単位で行っている。このように規模が変わっても同様の計算方法で予測することが可能である。 In the present embodiment, the prediction result is shown by 4 slabs, 3 slab yards, 1 hour unit, but in actual application, the number of slabs is thousands, the slab yards are tens, and the time increment is 1 This is done in minutes. Even if the scale changes in this way, it is possible to predict with the same calculation method.
１ 連続鋳造機
２ スラブ
３ 山
４ スラブヤード
５ 加熱炉
６ 熱間圧延機
１０ 連続鋳造機操業実績データベース
２０ スラブ搬送計画データベース
３０ 加熱炉装入温度予測システム
４０ 熱間圧延スケジューリングシステム
DESCRIPTION OF SYMBOLS 1 Continuous casting machine 2 Slab 3 Mountain 4 Slab yard 5 Heating furnace 6 Hot rolling mill 10 Continuous casting machine operation results database 20 Slab conveyance plan database 30 Heating furnace charging temperature prediction system 40 Hot rolling scheduling system
Claims (4)
連続鋳造機で鋳造され、所定の長さにトーチカットされたスラブのトーチカット時刻および該時刻でのスラブ温度を保持する連続鋳造機操業実績データベースと、
スラブ毎の搬送計画およびスラブヤードでの山積み情報を保持するスラブ搬送計画データベースと、
トーチカットされてからスラブヤードに搬送されるまでの搬送時間に基づくスラブの温度降下量と、スラブヤードでのスラブの温度推移と、スラブヤードから加熱炉に搬送されるまでの搬送時間に基づくスラブの温度降下量を計算することによって、スラブの加熱炉装入温度を予測する加熱炉装入温度予測システムとを具備することを特徴とする加熱炉のスラブ装入温度予測システム。 A heating furnace slab charging temperature prediction system for predicting a temperature of a slab charged into a heating furnace of a hot rolling mill in a steel mill,
A continuous casting machine operation result database that holds the torch cutting time of the slab cast by the continuous casting machine and torch cut to a predetermined length and the slab temperature at the time;
A slab transportation plan database that holds the transportation plan for each slab and the pile information at the slab yard;
Slab temperature drop amount based on transport time from torch cut to transport to slab yard, slab temperature transition in slab yard, and slab based on transport time from slab yard to heating furnace A slab charging temperature prediction system for a heating furnace, comprising a heating furnace charging temperature prediction system for predicting a slab heating furnace charging temperature by calculating a temperature drop amount of the slab.
前記スラブヤードでのスラブの温度推移の計算にあたっては、
温度推移を計算するスラブの温度と、温度推移を計算するスラブの上側に置かれたスラブの温度あるいは温度推移を計算するスラブの上側にスラブが置かれていない場合には外気温との温度差、および、
温度推移を計算するスラブの温度と、温度推移を計算するスラブの下側に置かれたスラブの温度あるいは温度推移を計算するスラブの下側にスラブが置かれていない場合には外気温との温度差のそれぞれに基づき、温度推移を計算するスラブの温度降下量を計算することを特徴とする加熱炉のスラブ装入温度予測システム。 In the heating furnace slab charging temperature prediction system according to claim 1,
In calculating the temperature transition of the slab at the slab yard,
Temperature difference between the temperature of the slab that calculates the temperature transition and the temperature of the slab placed above the slab that calculates the temperature transition, or the outside temperature if no slab is placed above the slab that calculates the temperature transition ,and,
The temperature of the slab that calculates the temperature transition and the temperature of the slab that is placed under the slab that calculates the temperature transition or the outside air temperature if there is no slab under the slab that calculates the temperature transition A slab charging temperature prediction system for a heating furnace, which calculates a temperature drop amount of a slab for calculating a temperature transition based on each temperature difference.
連続鋳造機で鋳造され、所定の長さにトーチカットされたスラブのトーチカットされてからスラブヤードに搬送されるまでの搬送時間に基づくスラブの温度降下量と、スラブヤードでのスラブの温度推移と、スラブヤードから加熱炉に搬送されるまでの搬送時間に基づくスラブの温度降下量を計算することによって、スラブの加熱炉装入温度を予測することを特徴とする加熱炉のスラブ装入温度予測方法。The temperature drop of the slab based on the transfer time from the torch cut of the slab cast by the continuous caster and torch cut to a predetermined length to the slab yard, and the slab temperature transition in the slab yard And a slab charging temperature of the heating furnace characterized by predicting a heating furnace charging temperature of the slab by calculating a temperature drop amount of the slab based on a transfer time from the slab yard to the heating furnace. Prediction method.
前記スラブヤードでのスラブの温度推移の計算にあたっては、In calculating the temperature transition of the slab at the slab yard,
温度推移を計算するスラブの温度と、温度推移を計算するスラブの上側に置かれたスラブの温度あるいは温度推移を計算するスラブの上側にスラブが置かれていない場合には外気温との温度差、および、Temperature difference between the temperature of the slab that calculates the temperature transition and the temperature of the slab placed above the slab that calculates the temperature transition, or the outside temperature if no slab is placed above the slab that calculates the temperature transition ,and,
温度推移を計算するスラブの温度と、温度推移を計算するスラブの下側に置かれたスラブの温度あるいは温度推移を計算するスラブの下側にスラブが置かれていない場合には外気温との温度差のそれぞれに基づき、温度推移を計算するスラブの温度降下量を計算することを特徴とする加熱炉のスラブ装入温度予測方法。The temperature of the slab that calculates the temperature transition and the temperature of the slab that is placed under the slab that calculates the temperature transition or the outside air temperature if there is no slab under the slab that calculates the temperature transition A method for predicting a slab charging temperature of a heating furnace, wherein a temperature drop amount of a slab for calculating a temperature transition is calculated based on each temperature difference.
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