JP6131560B2 - Control method of atmospheric gas concentration in continuous annealing furnace - Google Patents
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Description
本発明は、濃度の異なる雰囲気の処理帯を複数有する鋼帯の連続焼鈍炉において、炉内雰囲気ガス濃度を適切に制御する方法に関する。 The present invention relates to a method for appropriately controlling the atmospheric gas concentration in a furnace in a continuous annealing furnace for steel strips having a plurality of treatment zones having different concentrations.
鋼帯を搬送しながら焼鈍処理などを行う連続焼鈍炉においては、鋼帯の表面性状に係る品質の確保および高速冷却を目的として、連続焼鈍炉内の雰囲気中のガス濃度を処理帯（加熱帯、均熱帯、ガスジェット冷却帯、除冷帯等）毎に変更する必要が生じる。通常、雰囲気ガスとしては、水素ガスと窒素ガスとからなる還元性ガスが用いられる。ガスジェット冷却帯において鋼帯を冷却する場合、冷却速度が小さいという欠点がある。この欠点を補うべく、ガスジェット冷却帯では水素濃度を高めて冷却能を高くすることが知られている。このような連続焼鈍炉におけるガスジェット冷却帯の雰囲気ガスに高濃度水素を用いる場合、隣接する処理帯とのシール性を強化し、ガスジェット冷却帯内の雰囲気を高濃度水素状態に保つための技術が開示されている（特許文献１〜３）。また、高濃度水素雰囲気下のガスジェット冷却帯に隣接する処理帯の水素濃度を制御する技術が開示されている（特許文献４）。 In continuous annealing furnaces that perform annealing treatment while transporting steel strips, the gas concentration in the atmosphere in the continuous annealing furnace is set to the treatment zone (heating zone) for the purpose of ensuring the quality of the surface properties of the steel strip and fast cooling. , Soaking zone, gas jet cooling zone, cooling zone, etc.). Usually, a reducing gas composed of hydrogen gas and nitrogen gas is used as the atmospheric gas. When the steel strip is cooled in the gas jet cooling zone, there is a drawback that the cooling rate is low. In order to make up for this drawback, it is known to increase the hydrogen concentration in the gas jet cooling zone to increase the cooling capacity. When high-concentration hydrogen is used as the atmospheric gas in the gas jet cooling zone in such a continuous annealing furnace, the sealing performance with the adjacent treatment zone is strengthened, and the atmosphere in the gas jet cooling zone is maintained in a high-concentration hydrogen state. Techniques are disclosed (Patent Documents 1 to 3). Further, a technique for controlling the hydrogen concentration in a treatment zone adjacent to a gas jet cooling zone under a high concentration hydrogen atmosphere is disclosed (Patent Document 4).
しかし、特許文献１〜３の技術では、シール性が完全でない場合に、ガスジェット冷却帯からリークした高濃度の水素ガスが、隣接する処理帯の低濃度の水素ガスと混ざるため、隣接する処理帯の水素濃度を一定に保つことができないという問題がある。また、単にシール性を強化しても、鋼帯表面の疵が懸念されるため、完全なシール状態を作ることが非常に難しい。また、特許文献４の技術では、特殊なガス精製装置が必要となる。こうしたガス精製装置は非常に高価かつメンテナンスにも手間と費用がかかるため、安価かつ良好なメンテナンス性を両立することが難しい。 However, in the techniques of Patent Documents 1 to 3, when the sealing property is not perfect, the high-concentration hydrogen gas leaked from the gas jet cooling zone is mixed with the low-concentration hydrogen gas in the adjacent processing zone. There is a problem that the hydrogen concentration in the belt cannot be kept constant. Moreover, even if the sealing property is simply enhanced, it is very difficult to make a complete seal state because there is a concern about wrinkles on the surface of the steel strip. Further, the technique of Patent Document 4 requires a special gas purification device. Such a gas purification apparatus is very expensive and requires labor and cost for maintenance, so it is difficult to achieve both low cost and good maintainability.
本発明は、かかる事情に鑑みてなされたものであって、連続焼鈍炉内における各処理帯のガス濃度を制御するとともに、特殊なガス精製装置などを常設することなく安価に行うことができる連続焼鈍炉内雰囲気ガス濃度の制御方法を提供することを目的とする。 The present invention has been made in view of such circumstances, and is capable of controlling the gas concentration of each treatment zone in a continuous annealing furnace and continuously performing a low-cost operation without permanently installing a special gas purification apparatus or the like. It aims at providing the control method of the atmospheric gas concentration in an annealing furnace.
本発明の要旨は以下の通りである。
［１］高濃度水素雰囲気下のガスジェット冷却帯を有する連続焼鈍炉内の雰囲気ガス濃度の制御方法であって、前記ガスジェット冷却帯と、前記ガスジェット冷却帯に隣接し低濃度水素雰囲気下の処理帯との間の連通部の差圧に基づき、前記隣接する処理帯の水素濃度を算出し、前記隣接する処理帯の水素濃度が所定の水素濃度となるように、ガスジェット冷却帯および／または前記低濃度水素雰囲気下の処理帯に投入する窒素流量および／または水素流量を制御することを特徴とする連続焼鈍炉内雰囲気ガス濃度の制御方法。
［２］下記式（１）を満たすことにより、前記ガスジェット冷却帯および／または前記低濃度水素雰囲気下の処理帯に投入する窒素流量および／または水素流量を制御することを特徴とする［１］に記載の連続焼鈍炉内雰囲気ガス濃度の制御方法。
Ｃ３＝（Ｃ１×Ｑ１＋Ｃ２×Ｑ２）／（Ｑ１＋Ｑ２）・・・式（１）
ただし、
Ｃ１（ｖｏｌ％）：ガスジェット冷却帯に投入する水素濃度
Ｃ２（ｖｏｌ％）：隣接する処理帯に投入する水素濃度
Ｃ３（ｖｏｌ％）：隣接する処理帯の所定の水素濃度
Ｑ１（Ｎｍ３／ｈ）：ガスジェット冷却帯から隣接する処理帯に流出する水素および窒素の流量の和
Ｑ２（Ｎｍ３／ｈ）：隣接する処理帯に流出する水素および窒素の流量の和
であり、Ｑ１は下記式（２）を満たす。
Ｑ１（Ｎｍ３／ｈ）＝α×Ａ×（ΔＰ）１／２・・・式（２）
α：実機データで見出した係数
Ａ（ｍ２）：連通部の面積
ΔＰ：ガスジェット冷却帯と隣接帯との間の連通部における差圧（ガスジェット冷却帯の圧力＞隣接帯の圧力）
The gist of the present invention is as follows.
[1] A method for controlling the atmospheric gas concentration in a continuous annealing furnace having a gas jet cooling zone under a high-concentration hydrogen atmosphere, the gas jet cooling zone and a low-concentration hydrogen atmosphere adjacent to the gas jet cooling zone The hydrogen concentration in the adjacent processing zone is calculated on the basis of the differential pressure of the communication part between the gas jet cooling zone and the processing zone, and the hydrogen concentration in the adjacent processing zone becomes a predetermined hydrogen concentration. A method for controlling the atmospheric gas concentration in a continuous annealing furnace, wherein the flow rate of nitrogen and / or the flow rate of hydrogen introduced into the treatment zone under the low-concentration hydrogen atmosphere is controlled.
[2] By satisfying the following formula (1), a nitrogen flow rate and / or a hydrogen flow rate to be fed into the gas jet cooling zone and / or the treatment zone under the low-concentration hydrogen atmosphere is controlled [1] ] The control method of the atmospheric gas concentration in the continuous annealing furnace as described in any one of the above.
C3 = (C1 × Q1 + C2 × Q2) / (Q1 + Q2) Expression (1)
However,
C1 (vol%): Hydrogen concentration C2 (vol%) charged into the gas jet cooling zone: Hydrogen concentration C3 (vol%) charged into the adjacent processing zone: Predetermined hydrogen concentration Q1 (Nm 3 / N) in the adjacent processing zone h): Sum of the flow rates of hydrogen and nitrogen flowing out from the gas jet cooling zone to the adjacent treatment zone Q2 (Nm 3 / h): Sum of the flow rates of hydrogen and nitrogen flowing out into the adjacent treatment zone, Q1 is Equation (2) is satisfied.
Q1 (Nm 3 / h) = α × A × (ΔP) 1/2 Formula (2)
α: Coefficient A (m 2 ) found in actual machine data: Area of communication portion ΔP: Differential pressure in communication portion between gas jet cooling zone and adjacent zone (pressure of gas jet cooling zone> pressure in adjacent zone)
本発明によれば、連続焼鈍炉内のガス濃度を所定の適切な値に制御することができるとともに、特殊なガス精製装置などを常設することなく安価に行うことができ、実用上極めて有用である。 According to the present invention, the gas concentration in the continuous annealing furnace can be controlled to a predetermined appropriate value, and it can be performed at low cost without permanently installing a special gas purification apparatus, which is extremely useful in practice. is there.
本発明の実施形態について、図１を用いて詳細に説明する。図１は本発明の実施形態に係る連続焼鈍炉におけるガスジェット冷却帯および隣接する処理帯を示す概略図である。 An embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic view showing a gas jet cooling zone and an adjacent processing zone in a continuous annealing furnace according to an embodiment of the present invention.
図１において、ガスジェット冷却帯１には、加熱帯２および均熱帯３、除冷帯４が隣接している。なお、加熱帯２および均熱帯３は連通している。鋼帯Ｘは外気に曝されることなく、各処理帯を連続的に搬送するようになっている。 In FIG. 1, a gas jet cooling zone 1 is adjacent to a heating zone 2, a soaking zone 3, and a cooling zone 4. The heating zone 2 and the soaking zone 3 communicate with each other. The steel strip X is transported continuously without being exposed to the outside air.
また、ガスジェット冷却帯１および除冷帯４は高水素濃度雰囲気下、加熱帯２および均熱帯３は低水素濃度雰囲気下にある。ガスジェット冷却帯１に隣接し、低濃度雰囲気下の処理帯（加熱帯２および均熱帯３）と、ガスジェット冷却帯１との間には、連通部５が設けられている。
Further, the gas jet cooling zone 1 and the cooling zone 4 are in a high hydrogen concentration atmosphere, and the heating zone 2 and the soaking zone 3 are in a low hydrogen concentration atmosphere. Adjacent to the gas jet cooling zone 1, a
図１に示すように、ガスジェット冷却帯１、加熱帯２および均熱帯３、除冷帯４には、外部から水素ガス、窒素ガスがそれぞれ供給される。供給される水素ガスおよび窒素ガスの流量は、流量制御装置６により適宜調整される。流量制御装置６は、流量計、流量調節弁、コントローラー等よりなる。
As shown in FIG. 1, hydrogen gas and nitrogen gas are supplied to the gas jet cooling zone 1, the heating zone 2, the soaking zone 3, and the cooling zone 4 from the outside. The flow rates of the supplied hydrogen gas and nitrogen gas are appropriately adjusted by the flow
連通部５には、差圧計７が設置されている。差圧計７は、ガスジェット冷却帯１と、加熱帯２および均熱帯３との圧力差（以下、差圧と称することもある。）を測定する。
A differential pressure gauge 7 is installed in the
本発明において、連続焼鈍炉内雰囲気ガス濃度を制御するに際し、ガスジェット冷却帯１と、ガスジェット冷却帯１に隣接し低濃度水素雰囲気下の処理帯（加熱帯２＋均熱帯３）との間の連通部の差圧に基づき、隣接する処理帯の水素濃度を算出し、ガスジェット冷却帯および／または前記低濃度水素雰囲気下の処理帯に投入する窒素流量および／または水素流量を制御することを特徴とする。 In the present invention, when controlling the atmospheric gas concentration in the continuous annealing furnace, between the gas jet cooling zone 1 and the treatment zone (heating zone 2 + soaking zone 3) adjacent to the gas jet cooling zone 1 and under a low concentration hydrogen atmosphere. Calculating the hydrogen concentration in the adjacent treatment zone based on the differential pressure at the communicating portion of the gas, and controlling the nitrogen flow rate and / or the hydrogen flow rate charged into the gas jet cooling zone and / or the treatment zone under the low concentration hydrogen atmosphere It is characterized by.
その場合、下記式（１）を満たすことにより、前記ガスジェット冷却帯および／または前記低濃度水素雰囲気下の処理帯に投入する窒素流量および／または水素流量を制御することができる。
Ｃ３＝（Ｃ１×Ｑ１＋Ｃ２×Ｑ２）／（Ｑ１＋Ｑ２）・・・式（１）
ただし、
Ｃ１（ｖｏｌ％）：ガスジェット冷却帯に投入する水素濃度
Ｃ２（ｖｏｌ％）：隣接する処理帯に投入する水素濃度
Ｃ３（ｖｏｌ％）：隣接する処理帯の所定の水素濃度
Ｑ１（Ｎｍ３／ｈ）：ガスジェット冷却帯から隣接する処理帯に流出する水素および窒素の流量の和
Ｑ２（Ｎｍ３／ｈ）：隣接する処理帯に投入する水素および窒素の流量の和
であり、Ｑ１は下記式（２）を満たす。
Ｑ１（Ｎｍ３／ｈ）＝α×Ａ×（ΔＰ）１／２・・・式（２）
α：実機データで見出した係数
Ａ：連通部の面積
ΔＰ：ガスジェット冷却帯と隣接帯との間の連通部の差圧（ガスジェット冷却帯の連通部の圧力＞隣接帯の連通部の圧力）
ここで、係数αは、ガスジェット冷却帯から隣接する処理帯に流出する水素および窒素の流量、すなわち、リーク流量を計算するための係数であり、炉内の流路平均流速、流路差圧、流路断面積の実測値により求めることができる。
In that case, by satisfying the following formula (1), it is possible to control the nitrogen flow rate and / or the hydrogen flow rate supplied to the gas jet cooling zone and / or the treatment zone under the low-concentration hydrogen atmosphere.
C3 = (C1 × Q1 + C2 × Q2) / (Q1 + Q2) Expression (1)
However,
C1 (vol%): Hydrogen concentration C2 (vol%) charged into the gas jet cooling zone: Hydrogen concentration C3 (vol%) charged into the adjacent processing zone: Predetermined hydrogen concentration Q1 (Nm 3 / N) in the adjacent processing zone h): Sum of flow rates of hydrogen and nitrogen flowing out from the gas jet cooling zone to the adjacent treatment zone Q2 (Nm 3 / h): Sum of flow rates of hydrogen and nitrogen charged into the adjacent treatment zone, Q1 is Equation (2) is satisfied.
Q1 (Nm 3 / h) = α × A × (ΔP) 1/2 Formula (2)
α: Coefficient A found in actual machine data A: Area of communication portion ΔP: Pressure difference of communication portion between gas jet cooling zone and adjacent zone (pressure of communication portion of gas jet cooling zone> pressure of communication portion of adjacent zone )
Here, the coefficient α is a coefficient for calculating the flow rate of hydrogen and nitrogen flowing out from the gas jet cooling zone to the adjacent treatment zone, that is, the leak flow rate. , And can be obtained from an actual measurement value of the channel cross-sectional area.
係数αについては、一例として、以下のような方法で求めることができる。 As an example, the coefficient α can be obtained by the following method.
Ａは、連結部の断面積を実測する。Ｑ１は連結部の流速分布をピトー管などで測定し、その平均流速Ｖと断面積Ａの積から、Ｑ１＝Ｖ×Ａとして、求める。連結部の圧損ΔＰは、実測により求める。その結果、係数αは、α＝Ｑ１／（Ａ×（ΔＰ）１／２）で求めることができる。 A measures the cross-sectional area of the connecting portion. Q1 is obtained by measuring the flow velocity distribution of the connecting portion with a Pitot tube or the like, and calculating from the product of the average flow velocity V and the cross-sectional area A as Q1 = V × A. The pressure loss ΔP of the connecting portion is obtained by actual measurement. As a result, the coefficient α can be obtained by α = Q1 / (A × (ΔP) 1/2 ).
本発明において、連通部の差圧の測定方法としては、前後にプローブをセットし、差圧を実測することで求められる。 In the present invention, the method for measuring the differential pressure at the communicating portion is obtained by setting the probes in the front and rear directions and actually measuring the differential pressure.
本発明において、水素濃度および窒素濃度の求め方は、各種濃度計で炉内の濃度を実測することにより求められる。 In the present invention, the method for obtaining the hydrogen concentration and the nitrogen concentration is obtained by actually measuring the concentration in the furnace with various densitometers.
また、式（１）中のＣ１、Ｃ２は、下記式（３）（４）に示すように、投入する水素および窒素の流量に対する水素の流量の割合から求めることができる。
Ｃ１＝Ｑ１Ｈ２／（Ｑ１Ｈ２＋Ｑ１Ｎ２）・・・式（３）
Ｃ２＝Ｑ２Ｈ２／（Ｑ２Ｈ２＋Ｑ２Ｎ２）・・・式（４）
ただし、
Ｑ１Ｈ２（Ｎｍ３／ｈ）：ガスジェット冷却帯に投入する水素の流量
Ｑ１Ｎ２（Ｎｍ３／ｈ）：ガスジェット冷却帯に投入する窒素の流量
Ｑ２Ｈ２（Ｎｍ３／ｈ）：隣接する処理帯に投入する水素の流量
Ｑ２Ｎ２（Ｎｍ３／ｈ）：隣接する処理帯に投入する窒素の流量
なお、本発明において、Ｑ１Ｈ２およびＱ１Ｎ２は、ガスジェット冷却帯を所定の圧力に保つことができる流量とする。
Moreover, C1 and C2 in Formula (1) can be calculated | required from the ratio of the flow volume of hydrogen with respect to the flow volume of hydrogen and nitrogen to supply, as shown to following formula (3) (4).
C1 = Q1 H2 / (Q1 H2 + Q1 N2 ) (3)
C2 = Q2 H2 / (Q2 H2 + Q2 N2 ) (4)
However,
Q1 H2 (Nm 3 / h): Flow rate of hydrogen supplied to the gas jet cooling zone Q1 N2 (Nm 3 / h): Flow rate of nitrogen supplied to the gas jet cooling zone Q2 H2 (Nm 3 / h): Adjacent processing Hydrogen flow rate Q2 N2 (Nm 3 / h): Nitrogen flow rate to the adjacent treatment zone In the present invention, Q1 H2 and Q1 N2 maintain the gas jet cooling zone at a predetermined pressure. The flow rate can be
本発明において、上記の構成にすることにより、連続焼鈍炉内の低濃度雰囲気下の処理帯の水素濃度を所定の適切な値に制御することができる。例えば、ガスジェット冷却帯および除冷帯の水素濃度を７５ｖｏｌ％、加熱帯および均熱帯の水素濃度を２５ｖｏｌ％に保つことができる。さらに、特殊なガス精製装置などを常設することなく安価に行うことができ、実用上極めて有用である。 In the present invention, with the above configuration, the hydrogen concentration in the treatment zone in the low concentration atmosphere in the continuous annealing furnace can be controlled to a predetermined appropriate value. For example, the hydrogen concentration in the gas jet cooling zone and the cooling zone can be maintained at 75 vol%, and the hydrogen concentration in the heating zone and the soaking zone can be maintained at 25 vol%. Furthermore, it can be carried out at a low cost without permanently installing a special gas purification apparatus or the like, which is extremely useful in practice.
図１の連続焼鈍炉において、表１に記載の条件で水素濃度および窒素濃度を制御した。なお、連通部の差圧は、前後にプローブをセットし、差圧を実測することにより求めた。 In the continuous annealing furnace of FIG. 1, the hydrogen concentration and the nitrogen concentration were controlled under the conditions shown in Table 1. In addition, the differential pressure | voltage of a communication part was calculated | required by setting a probe before and behind and measuring a differential pressure | voltage.
表１の結果から、計算水素濃度Ｃ１を、目標水素濃度７５ｖｏｌ％の±１０ｖｏｌ％の範囲内にすることができた。 From the results in Table 1, the calculated hydrogen concentration C1 could be within a range of ± 10 vol% of the target hydrogen concentration of 75 vol%.
１ ガスジェット冷却帯
２ 加熱帯
３ 均熱帯
４ 除冷帯
５ 連通部
６ 流量制御装置
７ 差圧計
Ｘ 鋼帯
DESCRIPTION OF SYMBOLS 1 Gas jet cooling zone 2 Heating zone 3 Soaking zone 4
Claims (1)
Ｃ３＝（Ｃ１×Ｑ１＋Ｃ２×Ｑ２）／（Ｑ１＋Ｑ２）・・・式（１）
ただし、
Ｃ１（ｖｏｌ％）：ガスジェット冷却帯に投入する水素濃度であり、下記式（３）で示される。
Ｃ２（ｖｏｌ％）：隣接する処理帯に投入する水素濃度であり、下記式（４）で示される。
Ｃ３（ｖｏｌ％）：隣接する処理帯の所定の水素濃度
Ｑ１（Ｎｍ３／ｈ）：ガスジェット冷却帯から隣接する処理帯に流出する水素および窒素の流量の和
Ｑ２（Ｎｍ３／ｈ）：隣接する処理帯に投入する水素および窒素の流量の和
であり、Ｑ１は下記式（２）を満たす。
Ｑ１（Ｎｍ３／ｈ）＝α×Ａ×（ΔＰ）１／２・・・式（２）
α：実機データで見出した係数
Ａ（ｍ２）：連通部の面積
ΔＰ：ガスジェット冷却帯と隣接帯との間の連通部における差圧（ガスジェット冷却帯の圧力＞隣接帯の圧力）
Ｃ１＝Ｑ１ Ｈ２ ／（Ｑ１ Ｈ２ ＋Ｑ１ Ｎ２ ）・・・式（３）
ただし、
Ｑ１ Ｈ２ （Ｎｍ ３ ／ｈ）：ガスジェット冷却帯に投入する水素の流量
Ｑ１ Ｎ２ （Ｎｍ ３ ／ｈ）：ガスジェット冷却帯に投入する窒素の流量
Ｃ２＝Ｑ２ Ｈ２ ／（Ｑ２ Ｈ２ ＋Ｑ２ Ｎ２ ）・・・式（４）
ただし、
Ｑ２ Ｈ２ （Ｎｍ ３ ／ｈ）：隣接する処理帯に投入する水素の流量
Ｑ２ Ｎ２ （Ｎｍ ３ ／ｈ）：隣接する処理帯に投入する窒素の流量 A method for controlling an atmospheric gas concentration in a continuous annealing furnace having a gas jet cooling zone under a high concentration hydrogen atmosphere, the gas jet cooling zone, and a treatment zone under a low concentration hydrogen atmosphere adjacent to the gas jet cooling zone differential pressure ΔP obtained by the actual measurement is the following formula (1)-out based on the ~ (4), before Symbol hydrogen concentration of the hydrogen concentration and the adjacent treatment zone of the gas jet cooling zone of the communication portion between the as a predetermined hydrogen concentration, a continuous annealing furnace in an atmosphere gas, characterized in that control the nitrogen flow rate and / or hydrogen flow rate to the input gas jet cooling zone and / or the processing zone of a low concentration hydrogen atmosphere Concentration control method.
C3 = (C1 × Q1 + C2 × Q2) / (Q1 + Q2) Expression (1)
However,
C1 (vol%): hydrogen concentration supplied to the gas jet cooling zone , represented by the following formula (3).
C2 (vol%): This is the hydrogen concentration to be charged into the adjacent treatment zone and is represented by the following formula (4)
C3 (vol%): Predetermined hydrogen concentration Q1 (Nm 3 / h) in the adjacent treatment zone: Sum of flow rates of hydrogen and nitrogen flowing out from the gas jet cooling zone to the adjacent treatment zone Q2 (Nm 3 / h): Q1 is the sum of the flow rates of hydrogen and nitrogen supplied to adjacent processing zones, and satisfies the following formula (2).
Q1 (Nm 3 / h) = α × A × (ΔP) 1/2 Formula (2)
α: Coefficient A (m 2 ) found in actual machine data: Area of communication portion ΔP: Differential pressure in communication portion between gas jet cooling zone and adjacent zone (pressure of gas jet cooling zone> pressure in adjacent zone)
C1 = Q1 H2 / (Q1 H2 + Q1 N2 ) (3)
However,
Q1 H2 (Nm 3 / h): Flow rate of hydrogen input to the gas jet cooling zone
Q1 N2 (Nm 3 / h): Flow rate of nitrogen to be injected into the gas jet cooling zone
C2 = Q2 H2 / (Q2 H2 + Q2 N2 ) (4)
However,
Q2 H2 (Nm 3 / h): Flow rate of hydrogen input to the adjacent treatment zone
Q2 N2 (Nm 3 / h): Flow rate of nitrogen input to the adjacent treatment zone
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