JP6290691B2 - Method for determining the amount of pickling solution input - Google Patents

Method for determining the amount of pickling solution input Download PDF

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JP6290691B2
JP6290691B2 JP2014079675A JP2014079675A JP6290691B2 JP 6290691 B2 JP6290691 B2 JP 6290691B2 JP 2014079675 A JP2014079675 A JP 2014079675A JP 2014079675 A JP2014079675 A JP 2014079675A JP 6290691 B2 JP6290691 B2 JP 6290691B2
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hot
rolled steel
steel strip
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pickling
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西田　哲郎
哲郎 西田
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JFE Steel Corp
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Description

本発明は、熱延鋼帯を酸洗処理する際に、酸洗槽へ投入される塩酸等の酸洗液の投入量決定方法に関する。   The present invention relates to a method for determining the amount of pickling solution such as hydrochloric acid that is put into a pickling tank when a hot-rolled steel strip is pickled.

熱延鋼帯の酸洗ラインでは、酸洗槽内の塩酸や硫酸等の酸洗液に熱延鋼帯を浸漬させ、熱延鋼帯表面のスケールを除去する酸洗処理が行われる。この際、酸洗槽内の酸洗液は、酸濃度が低いと、スケールが完全に除去されずに残ってしまう。このため、酸洗ラインでは、酸洗槽内の酸洗液の酸濃度に応じて、酸洗槽へ未使用の酸洗液（新酸ともいう）が投入され、酸濃度が一定以上の濃度となるような操業が行われる。   In the pickling line for hot-rolled steel strip, pickling treatment is performed in which the hot-rolled steel strip is immersed in pickling liquid such as hydrochloric acid or sulfuric acid in a pickling tank to remove scale on the surface of the hot-rolled steel strip. At this time, the pickling solution in the pickling tank is left without being completely removed if the acid concentration is low. For this reason, in the pickling line, according to the acid concentration of the pickling liquid in the pickling tank, unused pickling liquid (also referred to as new acid) is put into the pickling tank, and the acid concentration is a concentration above a certain level. The operation will be performed.

このような酸洗ラインにおいて、新酸の投入は、コストの増加を招くことになるため、一定以上の酸洗槽内の酸濃度を確保した上で、新酸の投入量を削減するような酸洗液の投入量決定方法が求められている。このような酸洗液の投入量決定方法として、濃度計等の計器を用いて酸洗槽内の酸濃度を測定し、測定結果に基いて新酸の投入量を決定する方法が知られている。   In such a pickling line, the introduction of a new acid leads to an increase in cost, so that the amount of new acid input is reduced after securing a certain concentration of acid in the pickling tank. There is a need for a method for determining the amount of pickling solution. As a method for determining the amount of pickling solution input, a method is known in which the acid concentration in the pickling tank is measured using a meter such as a concentration meter, and the amount of new acid input is determined based on the measurement result. Yes.

例えば、特許文献１には、濃度計を用いて酸洗槽内の塩酸濃度と鉄イオン濃度を測定し、測定結果に基いて塩酸の投入量を調整することで、酸洗槽内の塩酸濃度を一定にする方法が開示されている。
さらに、例えば、特許文献２には、導電率計および密度計の測定結果から酸洗槽内の塩酸の濃度を演算し、測定結果に基いて酸洗槽の塩酸濃度をフィードバック制御する方法が開示されている。 For example, in Patent Document 1, the concentration of hydrochloric acid in the pickling tank is measured by using a densitometer to adjust the hydrochloric acid concentration and iron ion concentration in the pickling tank, and adjusting the input amount of hydrochloric acid based on the measurement result. Is disclosed.
Further, for example, Patent Document 2 discloses a method of calculating the concentration of hydrochloric acid in the pickling tank from the measurement results of the conductivity meter and the density meter, and feedback controlling the hydrochloric acid concentration in the pickling tank based on the measurement result. Has been.

特開２００２−１８０２７８号公報JP 2002-180278 A 国際公開第９９／２４６４３号International Publication No. 99/24643

ここで、上記以外の新酸の投入量削減方法として、酸洗槽内から排出された使用済みの酸洗液である廃液を廃酸タンクへ回収した後、この廃酸タンク内の廃液の酸濃度が酸洗槽で調整すべき酸濃度より高い場合に、廃酸タンク内の廃液を再度酸洗槽へ投入する方法が考えられる。このように廃酸を利用することで、廃酸投入分に相当する新酸の投入量を削減することができる。   Here, as a method of reducing the input amount of new acid other than the above, after collecting the waste liquid, which is the used pickling liquid discharged from the pickling tank, into the waste acid tank, the acid of the waste liquid in this waste acid tank When the concentration is higher than the acid concentration to be adjusted in the pickling tank, a method of charging the waste liquid in the waste acid tank again into the pickling tank can be considered. By using the waste acid in this way, it is possible to reduce the amount of new acid input corresponding to the amount of waste acid input.

しかし、特許文献１や特許文献２に記載の濃度計等の計器を用いて酸洗槽内の酸濃度を制御する方法において、上記の廃酸を利用する場合、廃酸中のスラジ等が計器に固着することにより測定誤差が生じることから、酸洗槽中の正確な酸濃度を把握することができず、新酸の投入量を削減することが困難であった。
また、このようなスラジ等の固着に対応するため、酸濃度の測定を濃度計等の計器を用いて手動で行うことも考えられるが、この場合、頻繁な測定が難しいことから酸洗槽内の酸濃度の変化に対応できない場合があり、新酸の投入量を削減することが困難であった。 However, in the method of controlling the acid concentration in the pickling tank using a meter such as a concentration meter described in Patent Document 1 or Patent Document 2, when the above-mentioned waste acid is used, sludge in the waste acid is a meter. Since the measurement error occurs due to sticking to the surface, it is impossible to grasp the exact acid concentration in the pickling tank, and it is difficult to reduce the amount of new acid introduced.
Moreover, in order to cope with such sticking of sludge, etc., it may be possible to manually measure the acid concentration using a meter such as a densitometer, but in this case, since frequent measurement is difficult, In some cases, it was difficult to cope with changes in the acid concentration, and it was difficult to reduce the amount of new acid input.

また、上記の課題に対して、操業状態に基いた複雑な化学モデルにより酸濃度を予測することも試みられているが、実機への合わせこみが難しく、実用レベルに達していない。このため、このような酸濃度の予測を用いた方法では、新酸の投入量を削減することが困難であった。
そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、使用済みの廃酸を用いた酸洗処理ラインにおいて、未使用の新酸の投入量を削減することが可能な酸洗液の投入量決定方法を提供することを目的としている。 In addition, it has been attempted to predict the acid concentration with a complicated chemical model based on the operating state, but it is difficult to fit into the actual machine and has not reached the practical level. For this reason, it has been difficult to reduce the amount of new acid input by the method using such prediction of acid concentration.
Therefore, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and in the pickling treatment line using used waste acid, it is possible to reduce the input amount of unused new acid. It is an object of the present invention to provide a method for determining the amount of pickling solution that can be used.

上記目的を達成するために、本発明の一態様に係る酸洗液の投入量決定方法は、酸洗液として、未使用の新酸および酸洗槽から回収される使用済みの廃酸を用いる熱延鋼帯の酸洗処理ラインにおける酸洗液の投入量決定方法であって、酸洗処理される上記熱延鋼帯の脱スケール性と、板幅と、上記廃酸の上記酸洗槽への投入状態とに基づいて、上記新酸の投入量を決定することを特徴とする。   In order to achieve the above object, the method for determining the amount of pickling solution according to one aspect of the present invention uses an unused new acid and a used waste acid recovered from a pickling tank as the pickling solution. A method for determining the amount of pickling solution in a pickling treatment line of a hot-rolled steel strip, the descalability of the hot-rolled steel strip to be pickled, the sheet width, and the pickling tank for the waste acid The amount of the new acid to be charged is determined based on the state of charging into the water.

このように、酸洗処理される上記熱延鋼帯の脱スケール性と、板幅と、上記酸洗槽から回収された廃酸の上記酸洗槽への投入状態とに基いて新酸の投入量が決定され、上記酸洗槽内の酸濃度を測定する必要がないため、濃度計等では自動または連続的に酸濃度の測定ができない廃酸を用いて酸洗処理をすることができ、廃酸の投入量に応じて新酸の投入量を削減することができる。   Thus, based on the descalability of the hot-rolled steel strip to be pickled, the plate width, and the state of charging the waste acid recovered from the pickling tank into the pickling tank, Since the amount to be charged is determined and there is no need to measure the acid concentration in the pickling tank, pickling can be performed using waste acid that cannot be measured automatically or continuously with a densitometer or the like. The amount of new acid can be reduced according to the amount of waste acid.

また、上記の酸洗液の投入量決定方法において、上記新酸の投入量を決定する際に、酸洗処理される第１の熱延鋼帯、および上記第１の熱延鋼帯の後に酸洗処理される少なくとも１つの上記熱延鋼帯の上記脱スケール性と、上記板幅とを用いて投入量が決定されてもよい。
このように、これから酸洗処理される複数の上記熱延鋼帯の条件に基いて新酸の投入量を算出するため、上記酸洗槽内の酸濃度を急激に切り替える必要がない。
また、上記の酸洗液の投入量決定方法において、上記新酸の投入量は下記（１）式で決定され、第ｉの熱延鋼帯の重み付け係数を、上記第１の熱延鋼帯とこの第１の熱延鋼帯の後に酸洗処理される少なくとも１つの上記熱延鋼帯との総数をｎとして、１／ｎとし、第ｉの難脱材係数を、上記熱延鋼帯が酸洗性の低い難脱材である場合には１．１とし、上記熱延鋼帯がそうでない一般材である場合には１．０とし、第ｉの熱延鋼帯の幅補正係数を、上記熱延鋼帯の幅が基準幅よりも大きい場合には１とし、上記熱延鋼帯の幅が上記基準幅以下の場合には上記基準幅に対する上記熱延鋼帯の幅の比とし、廃酸補正係数を、上記廃酸の上記酸洗槽への投入が有る場合には０．８とし、上記廃酸の上記酸洗槽への投入が無い場合には１．０としてもよい。 In the method for determining the amount of pickling solution to be charged, when determining the amount of the new acid to be charged, after the first hot-rolled steel strip to be pickled and the first hot-rolled steel strip The input amount may be determined using the descaling property of the at least one hot-rolled steel strip to be pickled and the plate width.
Thus, since the input amount of a new acid is calculated based on the conditions of the plurality of hot-rolled steel strips to be pickled, it is not necessary to switch the acid concentration in the pickling tank abruptly.
In the method for determining the amount of pickling solution to be fed, the amount of the new acid to be fed is determined by the following equation (1) , and the weighting coefficient of the i-th hot-rolled steel strip is set to the first hot-rolled steel strip. And the total number of the at least one hot-rolled steel strip to be pickled after the first hot-rolled steel strip is n, 1 / n, and the i-th difficult to remove material coefficient is the hot-rolled steel strip. Is 1.1 when the material is difficult to remove with low pickling property, and 1.0 when the hot-rolled steel strip is a general material that is not, and the width correction coefficient of the i-th hot-rolled steel strip Is 1 when the width of the hot-rolled steel strip is larger than the reference width, and when the width of the hot-rolled steel strip is equal to or less than the reference width, the ratio of the width of the hot-rolled steel strip to the reference width and then, the waste acid correction coefficient, when introduced into the pickling bath of the spent acid is present as 0.8, when introduced into the pickling bath of the spent acid is not in the 1.0 Moyo .

Figure 0006290691
ＳＶ：新酸投入量［Ｎｍ3／ｈ］
ＣＷ（i）：第ｉの熱延鋼帯の重み付け係数
ＫＮ（i）：第ｉの熱延鋼帯の難脱材係数
Ｗ（i）：第ｉの熱延鋼帯の幅補正係数
ＳＥ：新酸の基準投入量［Ｎｍ 3 ／ｈ］
ＫＨ：廃酸補正係数
Figure 0006290691
 SV: New acid input [Nm 3 / h]
CW (i): Weighting coefficient of i-th hot-rolled steel strip KN (i): Hard material removal coefficient of i-th hot-rolled steel strip W (i): Width correction coefficient of i-th hot-rolled steel strip SE: Standard input amount of new acid [Nm 3 / h]
KH: waste acid correction coefficient

本発明に係る酸洗液の投入量決定方法によれば、使用済みの廃酸を用いた酸洗処理ラインにおいて、未使用の新酸の投入量を削減することが可能となる。   According to the method of determining the amount of pickling solution according to the present invention, it is possible to reduce the amount of unused new acid used in the pickling treatment line using used waste acid.

本発明の一実施形態の酸洗処理ラインを示す概略構成図である。It is a schematic block diagram which shows the pickling line of one Embodiment of this invention. 本実施形態の新酸投入方法を示すフローチャートである。It is a flowchart which shows the new acid injection | throwing-in method of this embodiment.

＜１．酸洗処理ラインの構成＞
以下、本発明を実施するための形態（以下、実施形態という。）を、図面を参照しながら詳細に説明する。
まず、図１を参照して、本実施形態に係る酸洗処理ライン１の構成を説明する。本実施形態に係る酸洗処理ライン１は、酸洗槽１１と、廃酸タンク１２と、ポンプ１３と、流調弁１４と、制御部１５と、新酸投入ライン１０２と、廃酸投入ライン１０４と、廃酸排出ライン１０６，１１６とを備える。また、本実施形態に係る酸洗処理ライン１では、酸洗液として塩酸が用いられる。 <1. Structure of pickling line>
DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
First, with reference to FIG. 1, the structure of the pickling processing line 1 which concerns on this embodiment is demonstrated. The pickling treatment line 1 according to the present embodiment includes a pickling tank 11, a waste acid tank 12, a pump 13, a flow control valve 14, a control unit 15, a new acid charging line 102, and a waste acid charging line. 104 and waste acid discharge lines 106 and 116 are provided. In the pickling treatment line 1 according to the present embodiment, hydrochloric acid is used as the pickling solution.

酸洗槽１１は、新酸投入ライン１０２から投入される未使用の塩酸である新酸、および廃酸投入ライン１０４から投入される使用済みの廃酸を収容する。廃酸は、酸洗槽１１から廃酸排出ライン１０６を介して回収された塩酸および不図示の別系統の酸洗槽から廃酸排出ライン１１６を介して回収された塩酸の混合物であり、酸洗槽１１および不図示の別系統の酸洗槽で酸洗処理に用いられた塩酸であるため、新酸と異なりスラジ等の不純物を含む。酸洗槽１１での廃酸の排出は、酸洗槽１１内の塩酸が所定量以上となった場合に、廃酸排出ライン１０６を介して行われる。本実施形態に係る酸洗処理ライン１は、不図示の熱延鋼帯を酸洗槽１１に収容された塩酸に浸漬することで、熱延鋼帯表面のスケールを除去する。   The pickling tank 11 accommodates new acid, which is unused hydrochloric acid charged from the new acid charging line 102, and used waste acid charged from the waste acid charging line 104. The waste acid is a mixture of hydrochloric acid recovered from the pickling tank 11 via the waste acid discharge line 106 and hydrochloric acid recovered from a pickling tank of another system (not shown) via the waste acid discharge line 116. Unlike the new acid, it contains impurities such as sludge because it is hydrochloric acid used for the pickling treatment in the washing tank 11 and a separate pickling tank (not shown). Discharge of the waste acid in the pickling tank 11 is performed via the waste acid discharge line 106 when the hydrochloric acid in the pickling tank 11 exceeds a predetermined amount. The pickling treatment line 1 according to the present embodiment removes the scale on the surface of the hot-rolled steel strip by immersing a hot-rolled steel strip (not shown) in hydrochloric acid accommodated in the pickling tank 11.

廃酸タンク１２は、廃酸排出ライン１０６，１１６を介して酸洗槽１１および別系統の酸洗槽から排出された廃酸を収容する。廃酸タンク１２に収容された廃酸は、廃酸投入ライン１０４に設けられたポンプ１３により酸洗槽１１に投入される。ここで、酸洗槽１１内の酸洗液の酸濃度は、不図示の別系統の酸洗槽内の酸濃度よりも、さらには、廃酸排出ライン１１６を介して回収される廃酸の酸濃度よりも低く設定されている。したがって、廃酸タンク１２に収容された廃酸の酸濃度は、酸洗槽１１内の酸洗液の設定酸濃度よりも高くなっているので、酸洗槽１１内の酸濃度が設定よりも低くなって場合には、新酸の酸洗槽１１への投入に加えて、廃酸タンク１２内に収容された廃酸を酸洗槽１１に投入することによっても、酸洗槽１１内の酸濃度を高めることができる。また、廃酸タンク１２に収容された廃酸は、不図示の搬送ラインを介して不図示の精錬装置にも搬送される。精錬装置に搬送された廃酸は、蒸留されることでスラジ等の不純物が除去され、濃度が調整された新酸に精製される。なお、新酸投入ライン１０２から投入される新酸の酸濃度は、廃酸タンク１２内の廃酸の酸濃度よりも高い。   The waste acid tank 12 stores the waste acid discharged from the pickling tank 11 and the pickling tank of another system via the waste acid discharge lines 106 and 116. The waste acid stored in the waste acid tank 12 is charged into the pickling tank 11 by a pump 13 provided in the waste acid charging line 104. Here, the acid concentration of the pickling solution in the pickling tank 11 is more than the acid concentration in a pickling tank of another system (not shown), and moreover, the waste acid recovered through the waste acid discharge line 116. It is set lower than the acid concentration. Therefore, since the acid concentration of the waste acid accommodated in the waste acid tank 12 is higher than the set acid concentration of the pickling liquid in the pickling tank 11, the acid concentration in the pickling tank 11 is higher than the setting. When it becomes low, in addition to feeding the new acid into the pickling tank 11, the waste acid stored in the waste acid tank 12 can also be put into the pickling tank 11, so that The acid concentration can be increased. The waste acid stored in the waste acid tank 12 is also transported to a refining device (not shown) via a transport line (not shown). The waste acid transported to the refining apparatus is distilled to remove impurities such as sludge, and is purified to a new acid with adjusted concentration. Note that the acid concentration of the new acid input from the new acid input line 102 is higher than the acid concentration of the waste acid in the waste acid tank 12.

ポンプ１３は、廃酸投入ライン１０４に設けられ、廃酸タンク１２から酸洗槽１１まで廃酸を一定流量で搬送させる。
流調弁１４は、制御部１５の制御信号に応じて、新酸投入ライン１０２における新酸の投入量である流量を調整する。
制御部１５は、酸洗処理される熱延鋼帯の脱スケール性と、板幅と、廃酸の酸洗槽１１への投入状態とに基いて新酸の投入量を算出する。新酸の投入量決定方法の詳細については、後述する。さらに、制御部１５は、算出された新酸の投入量に基いて新酸投入ライン１０２における新酸の投入量を決定し、決定された新酸の投入量を示す制御信号を流調弁１４に送信する。また、制御部１５は、ポンプ１３の稼働状態を認識することで、廃酸の投入状態を認識する。制御部１５は、廃酸投入状態を定期的に認識し、廃酸投入状態を認識する度に新酸投入量を算出する。本実施形態では、制御部１５は、１分間に１回の間隔で廃酸投入状態を認識する。 The pump 13 is provided in the waste acid charging line 104 and conveys the waste acid from the waste acid tank 12 to the pickling tank 11 at a constant flow rate.
The flow control valve 14 adjusts the flow rate, which is the amount of new acid input in the new acid input line 102, according to the control signal of the control unit 15.
The control unit 15 calculates the amount of new acid charged based on the descalability of the hot-rolled steel strip to be pickled, the plate width, and the state of charging the spent acid into the pickling tank 11. Details of the method for determining the input amount of the new acid will be described later. Further, the control unit 15 determines a new acid input amount in the new acid input line 102 based on the calculated new acid input amount, and sends a control signal indicating the determined new acid input amount to the flow control valve 14. Send to. In addition, the control unit 15 recognizes the operating state of the pump 13 to recognize the state of waste acid input. The control unit 15 periodically recognizes the waste acid input state and calculates a new acid input amount each time the waste acid input state is recognized. In the present embodiment, the control unit 15 recognizes the waste acid input state at an interval of once per minute.

＜酸洗液の投入量決定方法＞
次に、本実施形態の新酸投入方法を示す図２を参照して、本実施形態に係る酸洗液の投入量決定方法について説明する。
本実施形態の新酸投入方法では、まず、制御部１５は、酸洗処理される熱延鋼帯の脱スケール性と、板幅と、廃酸の酸洗槽１１への投入状態とに基いて新酸の投入量を算出する（Ｓ２００）。ステップＳ２００の新酸投入量算出工程は、本実施形態に係る酸洗液の投入量決定方法である。ステップＳ２００では、新酸の投入量を決定するに際し、これから酸洗処理を行う熱延鋼帯（第１の熱延鋼帯ともいう）、および第１の熱延鋼帯の酸洗処理の後、順に酸洗処理が行われる熱延鋼帯である第２〜第５の熱延鋼帯の計５本の熱延鋼帯についての脱スケール性および板幅が考慮される。第１の熱延鋼帯は、酸洗処理ライン１にて酸洗処理がまだ行われていない場合にはこれから酸洗処理が行われる熱延鋼帯となり、酸洗処理が行われている場合には酸洗処理が行われている熱延鋼帯となる。この際、制御部１５は、（１）式に示す算出方法にて新酸の投入量を算出する。（１）式において、ＳＶは新酸投入量［Ｎｍ３／ｈ］、ＣＷ（ｉ）は第ｉの熱延鋼帯の重み付け係数、ＫＮ（ｉ）は第ｉの熱延鋼帯の難脱材係数、Ｗ（ｉ）は第ｉの熱延鋼帯の幅補正係数、ＳＥは新酸の基準投入量［Ｎｍ３／ｈ］、ＫＨは廃酸補正係数、ｎは５である。 <Method for determining the amount of pickling solution input>
Next, a method for determining the amount of pickling solution according to this embodiment will be described with reference to FIG.
In the new acid charging method of the present embodiment, first, the control unit 15 is based on the descalability of the hot-rolled steel strip to be pickled, the plate width, and the state of charging the spent acid into the pickling tank 11. Then, the input amount of the new acid is calculated (S200). The new acid input amount calculation step of step S200 is a method for determining the amount of pickling solution input according to this embodiment. In step S200, after determining the input amount of the new acid, after the hot-rolled steel strip to be pickled (hereinafter also referred to as the first hot-rolled steel strip) and the first hot-rolled steel strip. The descalability and sheet width of a total of five hot-rolled steel strips, the second to fifth hot-rolled steel strips, which are hot-rolled steel strips that are sequentially pickled, are considered. The first hot-rolled steel strip is a hot-rolled steel strip to be pickled when the pickling treatment line 1 has not yet been pickled, and the pickling treatment is being performed. It becomes a hot-rolled steel strip that has been pickled. At this time, the control unit 15 calculates the input amount of the new acid by the calculation method shown in the equation (1). In the formula (1), SV is the new acid input [Nm 3 / h], CW (i) is the weighting coefficient of the i-th hot-rolled steel strip, and KN (i) is the refractory escape of the i-th hot-rolled steel strip. The material coefficient, W (i) is the width correction coefficient of the i-th hot-rolled steel strip, SE is the standard input amount of new acid [Nm 3 / h], KH is the waste acid correction coefficient, and n is 5.

Figure 0006290691
Figure 0006290691

第ｉの熱延鋼帯の重み付け係数ＣＷ（ｉ）は、各熱延鋼帯同士の新酸投入量に対する影響の重みを示す比である。本実施形態では、各熱延鋼帯の第１の熱延鋼帯の新酸投入量に対する影響が同じであるとし、第ｉの熱延鋼帯の重み付け係数ＣＷ（ｉ）はすべて０．２とする。
第ｉの熱延鋼帯の難脱材係数ＫＮ（ｉ）は、各熱延鋼帯の酸洗性を示す係数であり、基準投入量ＳＥに対して新酸の投入量をどの程度増やすかを示す比率である。熱延鋼帯の酸洗性は、熱延鋼帯側の条件として、スケール組成、スケール中の空孔およびき裂の多少、スケールの厚さ等が影響する。このような熱延鋼帯側の条件は、熱延鋼帯の成分組成、および熱延条件により決まるため、予め各熱延鋼帯の酸洗性が難脱スケール性であるか否かは予想することができる。本実施形態では、第ｉの熱延鋼帯が一般材に比べ酸洗性の低い難脱材である場合には難脱材係数ＫＮ（ｉ）を１．１とし、そうでない一般材の場合には難脱材係数ＫＮ（ｉ）を１．０とする。 The weighting coefficient CW (i) of the i-th hot-rolled steel strip is a ratio indicating the weight of the influence on the new acid input amount between the hot-rolled steel strips. In this embodiment, it is assumed that the influence of the first hot-rolled steel strip on the new acid input amount is the same for each hot-rolled steel strip, and the weighting coefficients CW (i) of the i-th hot-rolled steel strip are all 0.2. And
The hard-to-remove material coefficient KN (i) of the i-th hot-rolled steel strip is a coefficient indicating the pickling property of each hot-rolled steel strip, and how much the input amount of the new acid is increased with respect to the reference input amount SE It is the ratio which shows. The pickling property of the hot-rolled steel strip is affected by the scale composition, the number of pores and cracks in the scale, the thickness of the scale, etc. as conditions on the hot-rolled steel strip side. Since such conditions on the hot-rolled steel strip side are determined by the composition of the hot-rolled steel strip and the hot-rolling conditions, it is predicted whether or not the pickling property of each hot-rolled steel strip is difficult to scale. can do. In the present embodiment, when the i-th hot-rolled steel strip is a difficult-to-remove material having lower pickling property than a general material, the difficult-to-removable material coefficient KN (i) is set to 1.1. In this case, the hard material removal coefficient KN (i) is 1.0.

第ｉの熱延鋼帯の幅補正係数Ｗ（ｉ）は、各熱延鋼帯の幅の大きさが酸洗性に与える影響を示す比率である。一般的に、スケール除去に必要な新酸の投入量は、熱延鋼帯の幅が小さくなるにつれて減少する。本実施形態では、幅補正係数Ｗ（ｉ）は、各熱延鋼帯の幅であるｗ（ｉ）が基準幅ＳＷよりも大きい場合にはＷ（ｉ）を１とし、ｗ（ｉ）が基準幅ＳＷ以下の場合にはＷ（ｉ）を基準幅ＳＷに対する各熱延鋼帯の幅ｗ（ｉ）の比であるｗ（ｉ）／ＳＷとする。   The width correction coefficient W (i) of the i-th hot-rolled steel strip is a ratio indicating the effect of the width of each hot-rolled steel strip on the pickling property. Generally, the amount of new acid required for descaling decreases as the width of the hot-rolled steel strip decreases. In this embodiment, the width correction coefficient W (i) is set to 1 when w (i), which is the width of each hot-rolled steel strip, is larger than the reference width SW, and w (i) is When the width is equal to or less than the reference width SW, W (i) is set to w (i) / SW which is a ratio of the width w (i) of each hot-rolled steel strip to the reference width SW.

新酸の基準投入量ＳＥは、酸洗処理ライン１で処理される最大幅を有する一般材の熱延鋼帯について、新酸のみでスケールの除去が可能な投入量である。本実施形態では、基準投入量ＳＥを２．５Ｎｍ３／ｈとする。
廃酸補正係数ＫＨは、廃酸の酸洗性を示し、ポンプ１３にて搬送される一定量の廃酸に対して新酸の投入量をどの程度減らせるかを示す比率である。廃酸の酸洗性は、廃酸の酸濃度、温度等の条件が影響し、熱延鋼帯の酸洗処理前に予め決定される。本実施形態では、ポンプ１３の稼働状態（廃酸の酸洗槽１１への投入有）においては、廃酸補正係数ＫＨは０．８とし、ポンプ１３の非稼働状態（廃酸の酸洗槽１１への投入無）においては廃酸補正係数ＫＨを１．０とする。 The standard input amount SE of the new acid is an input amount that can remove the scale only with the new acid for the hot rolled steel strip of the general material having the maximum width processed in the pickling treatment line 1. In the present embodiment, the reference input amount SE is set to 2.5 Nm 3 / h.
The waste acid correction coefficient KH indicates the pickling property of the waste acid, and is a ratio indicating how much the input amount of the new acid can be reduced with respect to the fixed amount of waste acid conveyed by the pump 13. The pickling properties of the waste acid are determined in advance before the pickling treatment of the hot-rolled steel strip because the conditions such as the acid concentration and temperature of the waste acid are affected. In the present embodiment, in the operating state of the pump 13 (with the waste acid being charged into the pickling tank 11), the waste acid correction coefficient KH is set to 0.8, and the pump 13 is not operating (the waste acid pickling tank). 11), the waste acid correction coefficient KH is set to 1.0.

ステップＳ２００において、制御部１５は、新酸投入量を算出した後、算出した投入量を示す制御信号を流調弁１４に送信する。
ステップＳ２００の後、流調弁１４は、制御信号に基いて算出された投入量となるように新酸を酸洗槽１１に投入する（Ｓ２０２）。
本実施形態の新酸投入方法では、ステップＳ２００の新酸投入量算出工程、およびステップＳ２０２の新酸投入工程は、制御部１５が廃酸投入状態を認識する度に行われる。 In step S <b> 200, the control unit 15 calculates a new acid input amount and then transmits a control signal indicating the calculated input amount to the flow control valve 14.
After step S200, the flow control valve 14 inputs new acid into the pickling tank 11 so that the input amount calculated based on the control signal is obtained (S202).
In the new acid charging method of the present embodiment, the new acid charging amount calculation step in step S200 and the new acid charging step in step S202 are performed each time the controller 15 recognizes the waste acid charging state.

＜変形例＞
以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 <Modification>
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

例えば、上記実施形態では、第ｉの熱延鋼帯の重み付け係数ＣＷ（ｉ）はすべて０．２としたが、本発明は係る例に限定されない。例えば、第１の熱延鋼帯の重み付け係数ＣＷ（１）〜第５の熱延鋼帯の重み付け係数ＣＷ（５）を、それぞれ１，０．８，０．５，０．３，０．０とし、酸洗処理される順が早い熱延鋼帯に、より重みを付けるように熱延鋼帯毎に重み付け係数ＣＷ（ｉ）の値を変えてもよい。このとき、重み付け係数ＣＷ（ｉ）が０の場合とは、その熱延鋼帯を考慮しないことを示す。   For example, in the above embodiment, the weighting coefficients CW (i) of the i-th hot-rolled steel strip are all 0.2, but the present invention is not limited to such examples. For example, the weighting coefficient CW (1) of the first hot-rolled steel strip to the weighting coefficient CW (5) of the fifth hot-rolled steel strip are set to 1, 0.8, 0.5, 0.3, 0. The value of the weighting coefficient CW (i) may be changed for each hot-rolled steel strip so that the hot-rolled steel strip that has been subjected to the pickling treatment is given a higher weight. At this time, the case where the weighting coefficient CW (i) is 0 indicates that the hot-rolled steel strip is not considered.

また、上記実施形態では、ステップＳ２００にて、新酸の投入量を算出する際に、第１〜第５の熱延鋼帯の５本の熱延鋼帯の脱スケール性と、板幅とが用いられたが、本発明はかかる例に限定されない。例えば、ステップＳ２００において、制御部１５は、これから酸洗処理される６本以上の熱延鋼帯に基いて新酸の投入量を算出してもよい。このとき、第１〜第ｎの熱延鋼帯に基いて新酸との投入量が算出される場合、新酸の投入量ＳＶは、上記実施形態と同様に数１で算出される（ｎは６以上の自然数）。   Moreover, in the said embodiment, when calculating the input amount of a new acid in step S200, the descalability of five hot-rolled steel strips of the first to fifth hot-rolled steel strips, the plate width, However, the present invention is not limited to such an example. For example, in step S200, the control unit 15 may calculate the amount of new acid input based on six or more hot-rolled steel strips to be pickled. At this time, when the input amount with the new acid is calculated based on the first to n-th hot-rolled steel strips, the input amount SV of the new acid is calculated by Equation 1 as in the above embodiment (n Is a natural number of 6 or more).

さらに、上記実施形態では、酸洗液として塩酸を用いたが、本発明は係る例に限定されない。例えば、酸洗液として、硫酸等の他の酸が用いられてもよい。
さらに、上記実施形態では、難脱材である場合には難脱材係数ＫＮ（ｉ）を１．１とし、そうでない場合には難脱材係数ＫＮ（ｉ）を１．０としたが、本発明は係る例に限定されない。例えば、熱延鋼帯の酸洗性に応じて、上記以外の値が設定されてもよい。また、例えば、熱延鋼帯の酸洗性に応じて、さらに多くの難脱材係数ＫＮ（ｉ）の値の水準が設定されてもよい。 Furthermore, in the said embodiment, although hydrochloric acid was used as a pickling liquid, this invention is not limited to the example which concerns. For example, other acids such as sulfuric acid may be used as the pickling solution.
Furthermore, in the said embodiment, when it was a hard material, the hard material coefficient KN (i) was set to 1.1, and when it was not so, the hard material coefficient KN (i) was set to 1.0. The present invention is not limited to such examples. For example, values other than those described above may be set according to the pickling properties of the hot-rolled steel strip. Further, for example, depending on the pickling property of the hot-rolled steel strip, more levels of the value of the difficulty removal material coefficient KN (i) may be set.

さらに、上記実施形態では、第ｉの熱延鋼帯の幅補正係数Ｗ（ｉ）は、各熱延鋼帯の幅であるｗ（ｉ）が基準幅ＳＷよりも大きい場合にはＷ（ｉ）を１とし、ｗ（ｉ）が基準幅ＳＷ以下の場合にはｗ（ｉ）／ＳＷとしたが、本発明は係る例に限定されない。例えば、第ｉの熱延鋼帯の幅補正係数Ｗ（ｉ）は、各熱延鋼帯の幅であるｗ（ｉ）が基準幅ＳＷよりも大きいか否かに関係なく、Ｗ（ｉ）を基準幅ＳＷに対する各熱延鋼帯の幅ｗ（ｉ）との比であるｗ（ｉ）／ＳＷとしてもよい。   Further, in the above embodiment, the width correction coefficient W (i) of the i-th hot-rolled steel strip is W (i) when w (i), which is the width of each hot-rolled steel strip, is larger than the reference width SW. ) Is set to 1 and w (i) is equal to or smaller than the reference width SW. However, the present invention is not limited to such an example. For example, the width correction coefficient W (i) of the i-th hot-rolled steel strip is W (i) regardless of whether w (i), which is the width of each hot-rolled steel strip, is larger than the reference width SW. It is good also as w (i) / SW which is ratio with the width w (i) of each hot-rolled steel strip with respect to the reference width SW.

さらに、上記実施形態では、基準投入量ＳＥは、２．５Ｎｍ３／ｈとしたが、本発明はかかる例に限定されない。例えば、基準投入量ＳＥは、酸洗液の種類、温度、濃度、成分組成、撹拌条件、さらに熱延鋼帯のスケール組成、スケール中の空孔およびき裂の多少、スケール厚さ等の条件から、適当な他の値が用いられてもよい。
さらに、上記実施形態では、廃酸投入有の場合の廃酸補正係数ＫＨは、０．８としたが、本発明はかかる例に限定されない。例えば、廃酸補正係数ＫＨは、廃酸の種類、温度、濃度、成分組成、撹拌条件、さらに熱延鋼帯のスケール組成、スケール中の空孔およびき裂の多少、スケール厚さ等の条件から、適当な他の値が用いられてもよい。 Further, in the above embodiment, the reference input amount SE is 2.5 Nm 3 / h, but the present invention is not limited to such an example. For example, the standard input amount SE is the condition of the pickling solution type, temperature, concentration, component composition, stirring conditions, scale composition of the hot-rolled steel strip, the number of pores and cracks in the scale, scale thickness, etc. From this, other suitable values may be used.
Further, in the above-described embodiment, the waste acid correction coefficient KH when waste acid is supplied is set to 0.8, but the present invention is not limited to this example. For example, the waste acid correction factor KH is the type of waste acid, temperature, concentration, component composition, stirring condition, scale composition of hot-rolled steel strip, the number of pores and cracks in the scale, scale thickness, etc. From this, other suitable values may be used.

さらに、上記実施形態では、ポンプ１３は、廃酸を酸洗槽１１に一定流量で投入するとしたが、本発明はかかる例に限定されない。例えば、ポンプ１３による廃酸の投入量は、手動または自動で変化してもよい。このとき、例えば、ポンプ１３は、廃酸タンク１２内の廃酸の収容量等に応じて自動で流量を変化させる。さらに、このように廃酸の投入量が変化する場合、制御部１５は、廃酸の投入量に応じて０〜１．０の範囲で廃酸補正係数ＫＨを変化させる。   Furthermore, in the said embodiment, although the pump 13 throws waste acid into the pickling tank 11 with a fixed flow volume, this invention is not limited to this example. For example, the input amount of the waste acid by the pump 13 may be changed manually or automatically. At this time, for example, the pump 13 automatically changes the flow rate in accordance with the amount of waste acid contained in the waste acid tank 12. Further, when the input amount of the waste acid changes as described above, the control unit 15 changes the waste acid correction coefficient KH in the range of 0 to 1.0 according to the input amount of the waste acid.

さらに、上記実施形態では、制御部１５は、ステップＳ２００において、酸洗処理される熱延鋼帯の脱スケール性と、板幅と、廃酸の酸洗槽１１への投入状態とに基いて新酸の投入量を算出するとしたが、本発明は係る例に限定されない。例えば、制御部１５は、さらに各熱延鋼帯の長さに基いて新酸の投入量が算出されてもよい。この際、熱延鋼帯毎の長さによる影響は、各熱延鋼帯の重み付け係数ＣＷ（ｉ）に考慮され、例えば長さの長い熱延鋼帯がある場合はその熱延鋼帯の重み付け係数ＣＷ（ｉ）が他の熱延鋼帯よりも大きくなるように設定されてもよい。   Furthermore, in the said embodiment, the control part 15 is based on the descaling property of the hot-rolled steel strip subjected to the pickling treatment, the sheet width, and the state of charging the waste acid into the pickling tank 11 in step S200. Although the input amount of the new acid is calculated, the present invention is not limited to such an example. For example, the control unit 15 may calculate the input amount of new acid based on the length of each hot-rolled steel strip. At this time, the influence of the length of each hot-rolled steel strip is taken into consideration for the weighting coefficient CW (i) of each hot-rolled steel strip. For example, when there is a long hot-rolled steel strip, The weighting coefficient CW (i) may be set to be larger than other hot rolled steel strips.

なお、本発明における酸洗液の投入量決定方法を、熱延鋼帯の酸洗処理ラインに適用している理由は、熱延鋼帯は、冷延鋼帯に比較して酸洗後の表面性状の要求が厳しくなく、酸洗槽中の濃度調整のためにスラジ等を含む廃酸を用いたとしても、得られる酸洗後の鋼帯の表面性状に問題が生じないためである。   In addition, the reason for applying the method for determining the amount of pickling solution in the present invention to the pickling treatment line of the hot-rolled steel strip is that the hot-rolled steel strip is after pickling compared to the cold-rolled steel strip. This is because the requirements for the surface properties are not strict, and even if waste acid containing sludge or the like is used for adjusting the concentration in the pickling tank, no problems occur in the surface properties of the resulting steel strip after pickling.

＜まとめ＞
以上のように、本発明に係る酸洗液の投入量決定方法は、酸洗処理される熱延鋼帯の脱スケール性と、板幅と、廃酸の酸洗槽１１への投入状態とに基いて新酸の投入量を算出する。本発明に係る酸洗液の投入量決定方法は、濃度計等の計器により塩酸濃度を測定する必要がないため、濃度計等では自動または連続的に酸濃度の測定ができない廃酸を用いて酸洗処理をすることができ、廃酸の投入量に応じて新酸の投入量を削減することができる。また、本発明に係る酸洗液の投入量決定方法は、酸濃度を測定するための濃度計等の計器を用いる必要がないため、計器の校正等のメンテナンスに掛かる手間を削減することができる。 <Summary>
As described above, the method for determining the amount of pickling solution according to the present invention includes the descalability of the hot-rolled steel strip to be pickled, the plate width, and the state of charging the spent acid into the pickling tank 11. The amount of new acid input is calculated based on this. The method for determining the amount of pickling solution according to the present invention does not need to measure the hydrochloric acid concentration with a meter such as a concentration meter, and therefore uses waste acid that cannot be measured automatically or continuously with a concentration meter or the like. Pickling treatment can be performed, and the input amount of new acid can be reduced according to the input amount of waste acid. In addition, the method for determining the amount of pickling solution according to the present invention does not require the use of a meter such as a concentration meter for measuring the acid concentration, thereby reducing the labor required for maintenance such as calibration of the meter. .

また、本発明に係る酸洗液の投入量決定方法は、新酸の投入量を算出するにあたり数１に示す算出式のみを用いればよいため、酸濃度を予測する際に複雑な化学モデルを用いる場合に比べ、簡便かつ正確に新酸の投入量を算出することが可能となる。
また、本発明に係る酸洗液の投入量決定方法は、これから酸洗処理される複数の熱延鋼帯の条件に基いて新酸の投入量を算出する。これにより、酸洗槽１１内の酸濃度を急激に切り替える必要がなく、酸洗処理される熱延鋼帯が切り替わった際に、酸洗槽１１内の酸濃度が切り替わった後の熱延鋼帯に適したものにすることができる。 Further, since the method for determining the amount of pickling solution according to the present invention only needs to use the calculation formula shown in Formula 1 when calculating the amount of new acid, a complicated chemical model is used to predict the acid concentration. Compared with the case of using, it becomes possible to calculate the input amount of the new acid easily and accurately.
In addition, the method for determining the amount of pickling solution according to the present invention calculates the amount of new acid input based on the conditions of a plurality of hot-rolled steel strips to be pickled. Thereby, it is not necessary to switch the acid concentration in the pickling tank 11 rapidly, and the hot rolled steel after the acid concentration in the pickling tank 11 is switched when the hot-rolled steel strip to be pickled is switched. It can be suitable for the band.

１ ：酸洗処理ライン
１１ ：酸洗槽
１２ ：廃酸タンク
１３ ：ポンプ
１４ ：流調弁
１５ ：制御部
１０２ ：新酸投入ライン
１０４ ：廃酸投入ライン
１０６ ：廃酸排出ライン
１１６ ：廃酸排出ライン DESCRIPTION OF SYMBOLS 1: Pickling process line 11: Pickling tank 12: Waste acid tank 13: Pump 14: Flow control valve 15: Control part 102: New acid input line 104: Waste acid input line 106: Waste acid discharge line 116: Waste acid Discharge line

Claims (1)

酸洗液として、未使用の新酸および酸洗槽から回収される使用済みの廃酸を用いる熱延鋼帯の酸洗処理ラインにおける酸洗液の投入量決定方法であって、酸洗処理される前記熱延鋼帯の脱スケール性と、板幅と、前記廃酸の前記酸洗槽への投入状態とに基づいて、前記新酸の投入量を決定し、
前記新酸の投入量を決定する際に、酸洗処理される第１の熱延鋼帯、および前記第１の熱延鋼帯の後に酸洗処理される少なくとも１つの前記熱延鋼帯の前記脱スケール性と、前記板幅とを用いて投入量が決定され、
前記新酸の投入量は下記（１）式で決定され、
第ｉの難脱材係数を、前記熱延鋼帯が酸洗性の低い難脱材である場合には１．１とし、前記熱延鋼帯がそうでない一般材である場合には１．０とし、
第ｉの熱延鋼帯の幅補正係数を、前記熱延鋼帯の幅が基準幅よりも大きい場合には１とし、前記熱延鋼帯の幅が前記基準幅以下の場合には前記基準幅に対する前記熱延鋼帯の幅の比とし、
廃酸補正係数を、前記廃酸の前記酸洗槽への投入が有る場合には０．８とし、前記廃酸の前記酸洗槽への投入が無い場合には１．０とし、
第ｉの重み付けの熱延鋼帯の重み付け係数を、前記第１の熱延鋼帯とこの第１の熱延鋼帯の後に酸洗処理される少なくとも１つの前記熱延鋼帯との総数をｎとして、１／ｎとし、
前記廃酸の酸濃度が、前記酸洗槽の酸濃度よりも高いことを特徴とする酸洗液の投入量決定方法。
Figure 0006290691
 ＳＶ：新酸投入量［Ｎｍ3／ｈ］
ＣＷ（i）：第ｉの熱延鋼帯の重み付け係数
ＫＮ（i）：第ｉの熱延鋼帯の難脱材係数
Ｗ（i）：第ｉの熱延鋼帯の幅補正係数
ＳＥ：新酸の基準投入量［Ｎｍ 3 ／ｈ］
ＫＨ：廃酸補正係数 As a pickling solution, a method for determining the amount of pickling solution used in a pickling treatment line of a hot-rolled steel strip that uses unused new acid and used waste acid recovered from a pickling tank, the pickling treatment Based on the descalability of the hot-rolled steel strip, the sheet width, and the state of charging the waste acid into the pickling tank, the amount of the new acid is determined,
When determining the input amount of the new acid, the first hot-rolled steel strip to be pickled and the at least one hot-rolled steel strip to be pickled after the first hot-rolled steel strip The input amount is determined using the descaling property and the plate width,
The input amount of the new acid is determined by the following formula (1):
The i-th hard-to-removal material coefficient is 1.1 when the hot-rolled steel strip is a hard-to-removable material with low pickling properties, and 1 when the hot-rolled steel strip is a general material that is not so. 0,
The width correction coefficient of the i-th hot-rolled steel strip is set to 1 when the width of the hot-rolled steel strip is larger than the reference width, and the reference when the width of the hot-rolled steel strip is equal to or less than the reference width. The ratio of the width of the hot-rolled steel strip to the width,
The waste acid correction factor is 0.8 when the waste acid is charged into the pickling tank, and 1.0 when the waste acid is not charged into the pickling tank .
The weighting coefficient of the i-th weighted hot-rolled steel strip is the total number of the first hot-rolled steel strip and at least one of the hot-rolled steel strips pickled after the first hot-rolled steel strip. n is 1 / n,
A method for determining the amount of pickling solution , wherein the acid concentration of the waste acid is higher than the acid concentration of the pickling tank .
Figure 0006290691
 SV: New acid input [Nm 3 / h]
CW (i): Weighting coefficient of i-th hot-rolled steel strip KN (i): Hard material removal coefficient of i-th hot-rolled steel strip W (i): Width correction coefficient of i-th hot-rolled steel strip SE: Standard input amount of new acid [Nm 3 / h]
KH: waste acid correction coefficient
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