JPH07233420A - Device for controlling furnace pressure in continuous annealing furnace - Google Patents
Device for controlling furnace pressure in continuous annealing furnaceInfo
- Publication number
- JPH07233420A JPH07233420A JP2685894A JP2685894A JPH07233420A JP H07233420 A JPH07233420 A JP H07233420A JP 2685894 A JP2685894 A JP 2685894A JP 2685894 A JP2685894 A JP 2685894A JP H07233420 A JPH07233420 A JP H07233420A
- Authority
- JP
- Japan
- Prior art keywords
- zone
- gas pressure
- gas
- pressure
- flow rate
- 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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- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鉄鋼、金属分野で用い
られる連続焼鈍炉の炉内圧制御装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace pressure control device for a continuous annealing furnace used in the fields of steel and metals.
【０００２】[0002]
【従来の技術】鉄鋼並びに金属分野で採用されている連
続焼鈍炉としては、図２に示す縦型炉および図３に示す
横型炉があり、何ずれも加熱帯１、均熱帯２および冷却
帯３の熱処理部からなり、鋼板４は入口に設けられたシ
ールロール５を通して加熱帯１に入り、複数個のロール
６をそれぞれ介して加熱帯１から均熱帯２、冷却帯３に
順次流れ、各熱処理部において熱処理（焼鈍）された
後、冷却帯３の出口に設けられたシールロール５を通し
て炉外へ搬送されるようになっている。2. Description of the Related Art As continuous annealing furnaces used in the fields of steel and metals, there are a vertical furnace shown in FIG. 2 and a horizontal furnace shown in FIG. The steel plate 4 enters the heating zone 1 through the seal roll 5 provided at the inlet, and sequentially flows from the heating zone 1 to the soaking zone 2 and the cooling zone 3 through a plurality of rolls 6, respectively. After being heat-treated (annealed) in the heat-treatment section, it is conveyed to the outside of the furnace through the seal roll 5 provided at the outlet of the cooling zone 3.
【０００３】この場合、加熱帯１、均熱帯２および冷却
帯３の内部には、Ｈ2 ，Ａｒ等を含んだ還元性のガス
（雰囲気ガス）が吹込まれ、大気圧より高い圧力に保持
され、シールロール５により外気（空気）の侵入を防止
すると共に、鋼板の還元反応を促進させるようにしてあ
る。また、各帯での還元反応の進み具合により鋼板の品
質が決まることから、各帯のガス圧力パターン（ガス圧
力バランス）は鋼板の種類に応じてそれぞれ決定され
る。In this case, a reducing gas (atmosphere gas) containing H 2 , Ar and the like is blown into the heating zone 1, the soaking zone 2 and the cooling zone 3 and is kept at a pressure higher than atmospheric pressure. The seal roll 5 prevents outside air (air) from entering and promotes the reduction reaction of the steel sheet. Moreover, since the quality of the steel sheet is determined by the progress of the reduction reaction in each zone, the gas pressure pattern (gas pressure balance) in each zone is determined according to the type of steel sheet.
【０００４】ところで、かかる連続焼鈍炉において、加
熱帯１、均熱帯２および冷却帯３の各ガス圧力を制御す
る炉内圧制御装置の代表的な例としては、図４（ａ），
（ｂ），（ｃ）に示すような構成のものがある。By the way, in such a continuous annealing furnace, a typical example of a furnace pressure control device for controlling the gas pressures of the heating zone 1, the soaking zone 2 and the cooling zone 3 is shown in FIG.
There is a configuration as shown in (b) and (c).
【０００５】図４（ａ）に示す炉内圧制御装置において
は、加熱帯１、均熱帯２、冷却帯３の各ガス圧力を圧力
センサ７により検出し、その検出値を指示部８に表示す
る。操業者は指示部８に表示された検出値から各帯のガ
ス圧力を監視し、各帯が所定のガス圧力バランスとなる
ように雰囲気ガスの吸込量をガス流量制御部９で変更
し、ガス圧力バランスを確保する。ガス流量制御部９で
は変更されたガス吸込量と流量センサ１０からのガス流
量検出信号を基にガス供給系に設けられた調節弁１１を
フィードバック制御する。In the reactor internal pressure control system shown in FIG. 4 (a), the gas pressures of the heating zone 1, the soaking zone 2 and the cooling zone 3 are detected by the pressure sensor 7, and the detected values are displayed on the indicator 8. . The operator monitors the gas pressure of each zone from the detection value displayed on the instruction section 8, and changes the suction amount of the atmospheric gas by the gas flow rate control section 9 so that each zone has a predetermined gas pressure balance. Ensure pressure balance. The gas flow rate control unit 9 feedback-controls the control valve 11 provided in the gas supply system based on the changed gas suction amount and the gas flow rate detection signal from the flow rate sensor 10.
【０００６】なお、上記の構成において、流量センサ１
０、流量制御弁９を省略し、直接調節弁９への操作量を
変更する場合もある。また、図４（ｂ）に示す炉内圧制
御装置においては、加熱帯１、均熱帯２、冷却帯３の各
ガス圧力を圧力センサ７により検出し、その検出信号を
基にガス圧力制御部１２ではガス供給系に設けられた調
節弁１１をフィードバック制御する。In the above structure, the flow sensor 1
0, the flow control valve 9 may be omitted, and the operation amount to the control valve 9 may be changed directly. Further, in the furnace pressure control device shown in FIG. 4B, the gas pressures of the heating zone 1, the soaking zone 2 and the cooling zone 3 are detected by the pressure sensor 7, and the gas pressure control unit 12 is based on the detection signals. Then, the control valve 11 provided in the gas supply system is feedback-controlled.
【０００７】さらに、図４（ｃ）に示す炉内圧制御装置
においては、加熱帯１、均熱帯２、冷却帯３の各ガス圧
力を圧力センサ７により検出し、加熱帯１、均熱帯２で
はその検出値を指示部８に表示し、冷却帯３ではガス圧
力制御部１２によりフィードバック制御する。冷却帯３
でのガス圧力フィードバック制御結果を代表すると、そ
の制御結果を比率設定器１３を介して所定のガス圧力バ
ランスになるように比率を乗じた後、ガス流量制御部９
の設定値となる。ガス流量制御部９では流量センサ１０
からの信号を基にガス供給系に設けられた調節弁１１を
フィードバック制御する。Further, in the furnace pressure control device shown in FIG. 4 (c), the gas pressures of the heating zone 1, the soaking zone 2 and the cooling zone 3 are detected by the pressure sensor 7, and in the heating zone 1 and the soaking zone 2 respectively. The detected value is displayed on the instructing unit 8, and feedback control is performed by the gas pressure control unit 12 in the cooling zone 3. Cooling zone 3
As a representative of the gas pressure feedback control result in step 1, the control result is multiplied by a ratio via the ratio setting device 13 so that a predetermined gas pressure balance is obtained, and then the gas flow rate control unit
It becomes the setting value of. In the gas flow rate control unit 9, the flow rate sensor 10
The control valve 11 provided in the gas supply system is feedback-controlled based on the signal from the.
【０００８】[0008]
【発明が解決しようとする課題】しかし、このような従
来の連続焼鈍炉の炉内圧制御装置は、次のような問題が
ある。すなわち、図４（ａ）に示す構成の炉内圧制御装
置では、ガス圧力バランスの管理を操業者が行っている
ため、自動操業ができないばかりでなく、細目なガス圧
力バランスの管理ができないことから鋼板の品質を上げ
ることができない。However, such a conventional furnace pressure control device for a continuous annealing furnace has the following problems. That is, in the reactor internal pressure control device having the configuration shown in FIG. 4 (a), since the operator manages the gas pressure balance, not only automatic operation cannot be performed but also detailed gas pressure balance management cannot be performed. The quality of steel sheet cannot be improved.
【０００９】また、図４（ｂ）に示す構成の炉内圧制御
装置では、炉の入口、出口は図２に示すようにシールロ
ールによりある程度シールされているが、加熱帯１、均
熱帯２、冷却帯３の各帯の間は継がっているため、ガス
圧力バランスの管理を各帯のガス圧力設定値で行なって
も、加熱帯１で多量の雰囲気ガスを吸込むとそれが均熱
帯２や冷却帯３に回り込み、お互いに干渉してしまい、
ガス圧力バランスの確保と絶対ガス圧力の確保が難しく
なる。Further, in the furnace internal pressure control device having the structure shown in FIG. 4 (b), the inlet and outlet of the furnace are sealed to some extent by the seal rolls as shown in FIG. 2, but the heating zone 1, the soaking zone 2, Since each zone of the cooling zone 3 is connected, even if the gas pressure balance is managed with the gas pressure set value of each zone, if a large amount of atmospheric gas is sucked into the heating zone 1, it will be It goes around the cooling zone 3 and interferes with each other.
It becomes difficult to secure gas pressure balance and absolute gas pressure.
【００１０】さらに、図４（ｃ）に示す構成の炉内圧制
御装置では、絶対ガス圧力の確保を冷却帯３の圧力制御
結果を代表して各帯にフィードバックし、ガス圧力バラ
ンスの管理は各帯への配分比率で決めているが、実際に
ガス圧力バランスが確保されている保証がないため、操
業者は各帯の圧力を監視して比率を変更する必要があ
る。Further, in the reactor internal pressure control device having the configuration shown in FIG. 4 (c), the securement of the absolute gas pressure is fed back to each zone on behalf of the pressure control result of the cooling zone 3 to control the gas pressure balance. Although it is determined by the distribution ratio to the zones, there is no guarantee that the gas pressure balance is actually secured, so operators need to monitor the pressure in each zone and change the ratio.
【００１１】本発明は上記のような問題点に鑑みてなさ
れたもので、その目的は操業の自動化を図り、且つ各帯
のガス圧力バランスの管理を分かり易くすると共に、絶
対ガス圧力の確保、ガス圧力バランスの確保を確実にし
て製品の品質向上を図ることができる連続焼鈍炉の炉内
圧制御装置を提供することにある。The present invention has been made in view of the above problems, and its purpose is to automate the operation, to make it easy to understand the gas pressure balance of each zone, and to secure the absolute gas pressure. An object of the present invention is to provide a furnace pressure control device for a continuous annealing furnace that can ensure the gas pressure balance and improve the product quality.
【００１２】[0012]
【課題を解決するための手段】本発明は上記の目的を達
成するため、次のような手段により連続焼鈍炉の炉内圧
制御装置を構成するものである。請求項１に対応する発
明は、内部にガス供給系を通して雰囲気ガスがそれぞれ
吹込まれる加熱帯、均熱帯および冷却帯の熱処理部から
なり、加熱帯から均熱帯、冷却帯に順次鋼材を流して各
帯で熱処理する連続焼鈍炉において、各帯の内部のガス
圧力を検出する圧力センサと、各帯の圧力センサにより
検出されたガス圧力検出信号に基づいてガス圧力フィー
ドバック制御信号を出力する圧力制御手段と、各帯の圧
力制御手段から入力されるガス圧力フィードバック制御
信号を各帯のガス圧力バランスに応じて設定された配分
比率を乗じてこれを各帯のガス圧力設定値とし、この設
定値に基づいて前記ガス供給系より各帯に吹込まれる雰
囲気ガス量を制御する比率設定手段と、前記加熱帯、均
熱帯および冷却帯の何ずれかの帯の圧力制御結果を絶対
圧として他の帯の比率設定器に設定された配分比率を補
正する補正手段とを備える。In order to achieve the above object, the present invention constitutes a furnace pressure control device for a continuous annealing furnace by the following means. The invention corresponding to claim 1 comprises a heat treatment part of a heating zone, a soaking zone and a cooling zone into which an atmospheric gas is respectively blown through a gas supply system, and a steel material is sequentially flown from the heating zone to the soaking zone and the cooling zone. In a continuous annealing furnace for heat treatment in each zone, a pressure sensor that detects the gas pressure inside each zone and a pressure control that outputs a gas pressure feedback control signal based on the gas pressure detection signal detected by the pressure sensor in each zone Means and the gas pressure feedback control signal input from the pressure control means of each zone is multiplied by the distribution ratio set according to the gas pressure balance of each zone, and this is set as the gas pressure set value of each zone. Ratio setting means for controlling the amount of atmospheric gas blown into each zone from the gas supply system based on the above, and pressure control results for any of the heating zone, soaking zone and cooling zone. And a correcting means for correcting the distribution ratio set in the ratio setter for other bands as Tai圧.
【００１３】請求項２に対応する発明は、内部にガス供
給系を通して雰囲気ガスがそれぞれ吹込まれる加熱帯、
均熱帯および冷却帯の熱処理部からなり、加熱帯から均
熱帯、冷却帯に順次鋼材を流して各帯で熱処理する連続
焼鈍炉において、各帯の内部のガス圧力を検出する圧力
センサと、各帯の圧力センサにより検出されたガス圧力
検出信号に基づいてガス圧力フィードバック制御信号を
出力する圧力制御手段と、各帯の圧力制御手段から入力
されるガス圧力フィードバック制御信号を各帯のガス圧
力バランスに応じて設定された配分比率を乗じてこれを
各帯のガス圧力設定値として出力する比率設定手段と、
前記加熱帯、均熱帯および冷却帯の何ずれかの帯の圧力
制御結果に基づいて他の帯の比率設定手段に設定された
配分比率を補正する補正手段と、前記ガス供給系より各
帯に吹込まれるガス流量を検出する流量センサと、前記
比率設定手段より出力されるガス圧力設定値と前記流量
センサにより検出されたガス流量検出値に基づいて各帯
に吹込まれるガス流量を制御する流量制御手段とを備え
る。The invention corresponding to claim 2 is a heating zone in which atmospheric gas is blown through a gas supply system,
In a continuous annealing furnace that consists of heat treatment parts in the soaking zone and cooling zone, in which a steel material is sequentially flown from the heating zone to the soaking zone and cooling zone and heat treated in each zone, a pressure sensor that detects the gas pressure inside each zone, and The pressure control means for outputting a gas pressure feedback control signal based on the gas pressure detection signal detected by the band pressure sensor, and the gas pressure feedback control signal input from the pressure control means of each band are used for the gas pressure balance of each band. Ratio setting means for multiplying the distribution ratio set according to and outputting this as the gas pressure set value for each band,
Correction means for correcting the distribution ratio set in the ratio setting means of the other zones based on the pressure control result of any one of the heating zone, the soaking zone and the cooling zone, and each zone from the gas supply system A flow rate sensor for detecting the flow rate of the gas to be blown, and a gas flow rate to be blown into each zone is controlled based on the gas pressure set value output from the ratio setting means and the gas flow rate detection value detected by the flow rate sensor. Flow rate control means.
【００１４】[0014]
【作用】上記請求項１に対応する発明の構成にあって
は、加熱帯、均熱帯および冷却帯の各ガス圧力が圧力セ
ンサにより検出され、その検出信号が各帯のガス圧力制
御手段に入力されると、このガス圧力制御手段はその検
出信号を基にガス圧フィードバック制御信号を比率設定
手段に入力する。この比率設定手段では、ガス圧フィー
ドバック制御信号に予め設定された各帯のガス圧力の配
分比率を乗じてガス圧力設定値とし、この設定値に基づ
いてガス供給系より各帯に吹込まれる雰囲気ガス量を制
御する。このとき、加熱帯、均熱帯および冷却帯の何ず
れかの帯のガス圧力制御結果が他の帯の比率設定手段に
入力され、その配分比率が補正される。In the configuration of the invention corresponding to the above-mentioned claim 1, the pressure of each gas in the heating zone, the soaking zone and the cooling zone is detected by the pressure sensor, and the detection signal is input to the gas pressure control means of each zone. Then, the gas pressure control means inputs the gas pressure feedback control signal to the ratio setting means based on the detection signal. In this ratio setting means, the gas pressure feedback control signal is multiplied by the preset distribution ratio of the gas pressure of each zone to obtain a gas pressure set value, and the atmosphere supplied from the gas supply system to each zone based on this set value. Control the amount of gas. At this time, the gas pressure control result of any one of the heating zone, the soaking zone and the cooling zone is input to the ratio setting means of the other zones, and the distribution ratio is corrected.
【００１５】従って、各帯のガス圧力バランスは直接ガ
ス圧力設定値で管理され、絶対ガス圧力バランスは何ず
れかの帯のガス圧力制御結果に基づいて他の帯の比率設
定手段に設定された配分比率を補正することにより確保
されるので、絶対ガス圧力バランスの確保、ガス圧力バ
ランスの確保およびガス圧力バランスの管理が分かり易
くなり、製品の品質向上および操業の自動化を図ること
が可能となる。Therefore, the gas pressure balance of each band is directly controlled by the gas pressure set value, and the absolute gas pressure balance is set in the ratio setting means of other bands based on the gas pressure control results of some bands. Since it is secured by correcting the distribution ratio, it becomes easier to understand the absolute gas pressure balance, the gas pressure balance and the gas pressure balance management, and it is possible to improve the product quality and automate the operation. .
【００１６】上記請求項２に対応する発明の構成にあっ
ては、上記の作用および効果に加えてガス供給系より各
帯に吹込まれるガス流量を流量センサにより検出し、比
率設定手段より出力されるガス圧力設定値と流量センサ
により検出されたガス供給系より各帯に吹込まれるガス
流量の検出値とを流量制御手段に与えて各帯に吹込まれ
るガス流量を制御することにより、各帯のガス圧力バラ
ンスをより確実に確保することができる。In the structure of the invention corresponding to the above-mentioned claim 2, in addition to the above-described action and effect, the flow rate of the gas blown into each zone from the gas supply system is detected by the flow rate sensor, and output from the ratio setting means. By controlling the gas flow rate blown into each zone by giving the flow rate control means a detected value of the gas flow rate blown into each zone from the gas supply system detected by the gas supply system detected by the flow rate sensor, The gas pressure balance in each zone can be secured more reliably.
【００１７】[0017]
【実施例】以下本発明の一実施例を図面を参照して説明
する。図１は縦型の連続焼鈍炉の炉内圧制御装置の構成
例を示すもので、図４と同一部分には同一符号を付して
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a structural example of a furnace internal pressure control device for a vertical continuous annealing furnace, and the same parts as those in FIG. 4 are designated by the same reference numerals.
【００１８】図１に示すように連続焼鈍炉は加熱帯１、
均熱帯２および冷却帯３の熱処理部からなり、図示して
いないが鋼板は入口に設けられたシールロールを通して
加熱帯１に入り、複数個のロールをそれぞれ介して加熱
帯１から均熱帯２、冷却帯３に順次流れ、各熱処理部に
おいて熱処理（焼鈍）された後、冷却帯３の出口に設け
られたシールロールを通して炉外へ搬送されるようにな
っている。As shown in FIG. 1, the continuous annealing furnace has a heating zone 1,
A heat treatment part of the soaking zone 2 and the cooling zone 3. Although not shown, the steel plate enters the heating zone 1 through a sealing roll provided at the inlet, and the soaking zone 2 is soaked from the heating zone 1 through a plurality of rolls, respectively. After being sequentially flown into the cooling zone 3 and subjected to heat treatment (annealing) in each heat treatment section, it is conveyed to the outside of the furnace through a seal roll provided at the outlet of the cooling zone 3.
【００１９】また、加熱帯１、均熱帯２および冷却帯３
の内部には、ガス供給系を通してＨ2 ，Ａｒ等を含んだ
還元性のガス（雰囲気ガス）が吹込まれ、大気圧より高
い圧力に保持されると共に、図示しないシールロールに
より外気（空気）の侵入を防止すると共に、鋼板の還元
反応を促進させるようにしてある。Further, heating zone 1, soaking zone 2 and cooling zone 3
A reducing gas (atmosphere gas) containing H 2 , Ar and the like is blown into the inside of the chamber and is kept at a pressure higher than the atmospheric pressure, and at the same time, a seal roll (not shown) is used to remove the outside air (air). The intrusion is prevented and the reduction reaction of the steel sheet is promoted.
【００２０】このような構成の連続焼鈍炉において、本
実施例では加熱帯１、均熱帯２、冷却帯３に対応させて
圧力センサ７を設け、この圧力センサ７により検出され
た各帯のガス圧検出信号はガス圧力制御部１２にそれぞ
れ入力される。In the continuous annealing furnace having such a structure, in this embodiment, pressure sensors 7 are provided corresponding to the heating zone 1, soaking zone 2 and cooling zone 3, and the gas of each zone detected by the pressure sensor 7 is provided. The pressure detection signals are input to the gas pressure control unit 12, respectively.
【００２１】各ガス圧力制御部１２はガス圧検出信号を
基にフィードバック制御信号を出力するもので、このフ
ィードバック制御信号は各帯に対応させて設けられた比
率設定器１３にそれぞれ入力される。各比率設定器１３
は、ガス圧力制御部１２からのフィードバック制御信号
に鋼板の種類に応じてそれぞれ決定される各帯のガス圧
力パターン（ガス圧力バランス）となるように比率を乗
じるもので、その出力信号はガス流量制御部９に設定値
として入力される。また、加熱帯１および均熱帯２の比
率設定器１３には例えば冷却帯３のガス圧力を制御する
ガス圧力制御部１２のガス圧力フィードバック制御結果
が絶対ガス圧力を確保するのために入力される。Each gas pressure control unit 12 outputs a feedback control signal on the basis of the gas pressure detection signal, and this feedback control signal is inputted to the ratio setting device 13 provided corresponding to each band. Each ratio setter 13
Is to multiply the feedback control signal from the gas pressure control unit 12 by a ratio so as to be a gas pressure pattern (gas pressure balance) of each zone determined according to the type of steel plate, and the output signal is the gas flow rate. It is input to the control unit 9 as a set value. Further, for example, the gas pressure feedback control result of the gas pressure control unit 12 that controls the gas pressure of the cooling zone 3 is input to the heating zone 1 and the soaking zone 2 ratio setting device 13 in order to secure the absolute gas pressure. .
【００２２】各ガス流量制御部９は、ガス供給系を通し
て各帯に吹込まれる雰囲気ガスの流量を検出する流量セ
ンサ１０からの検出信号が入力され、この流量センサ１
０の検出信号と比率設定器１３の出力信号とに基づいて
各帯に対応させて設けられた調節弁６を制御するもので
ある。Each gas flow rate control unit 9 receives a detection signal from a flow rate sensor 10 for detecting the flow rate of the atmospheric gas blown into each zone through the gas supply system.
The control valve 6 provided corresponding to each band is controlled based on the detection signal of 0 and the output signal of the ratio setting device 13.
【００２３】次に上記のように構成された連続焼鈍炉の
炉内圧制御装置の作用について述べる。いま、連続焼鈍
炉の加熱帯１、均熱帯２、冷却帯３の各圧力を圧力セン
サ７により検出され、その検出信号がガス圧力制御部１
２に入力されると、各帯のガス圧力制御部１２では検出
信号に基づいてフィードバック制御信号を比率設定器１
３に入力する。また、加熱帯１および均熱帯２の比率設
定器１３には冷却帯３のガス圧力を制御するガス圧力制
御部１２のガス圧力フィードバック制御結果を絶対ガス
圧力確保のために入力する。Next, the operation of the furnace pressure control device of the continuous annealing furnace configured as described above will be described. Now, each pressure of the heating zone 1, the soaking zone 2, and the cooling zone 3 of the continuous annealing furnace is detected by the pressure sensor 7, and the detection signal is detected.
2 is input to the gas pressure control unit 12 of each band, a feedback control signal is sent to the ratio setter 1 based on the detection signal.
Enter in 3. Further, the gas pressure feedback control result of the gas pressure control unit 12 that controls the gas pressure of the cooling zone 3 is input to the heating zone 1 and the soaking zone 2 ratio setting device 13 in order to secure the absolute gas pressure.
【００２４】この比率設定器１３では、ガス圧力制御部
１２からの検出信号に各帯が所定のガス圧力バランスと
なるように予め設定された比率を乗じた後、ガス流量制
御部９に設定値として入力する。In the ratio setter 13, the detection signal from the gas pressure control unit 12 is multiplied by a ratio set in advance so that each band has a predetermined gas pressure balance, and then the set value is set in the gas flow rate control unit 9. Enter as.
【００２５】この場合、比率設定器１３の比率を、ｋ´
＝ｋ＋αΔＭＶ、又はｋ´＝ｋ＋α（ＭＶ−５０）の補
正を行う。但し、ｋ´：補正後の比率、ｋ：補正前の比
率、α：係数、ΔＭＶ：制御演算結果ＭＶの前回値と今
回値との差、ＭＶ：制御演算結果である。In this case, the ratio of the ratio setter 13 is set to k '.
= K + αΔMV or k ′ = k + α (MV-50) is corrected. However, k ': ratio after correction, k: ratio before correction, α: coefficient, ΔMV: difference between previous value and current value of control calculation result MV, MV: control calculation result.
【００２６】また、制御演算結果ＭＶから５０を減算し
ているのは、５０を基準（±０）としていることを示し
ている。各帯の比率設定器１３よりガス流量制御部９に
設定値が入力されると、ガス流量制御部９では設定値と
流量センサ１０からの信号を基にガス供給系に設けられ
た調節弁１１をフィードバック制御する。Further, subtraction of 50 from the control calculation result MV indicates that 50 is used as a reference (± 0). When a set value is input to the gas flow rate control unit 9 from the ratio setter 13 of each band, the gas flow rate control unit 9 controls the control valve 11 provided in the gas supply system based on the set value and the signal from the flow rate sensor 10. Feedback control.
【００２７】このように本実施例によれば、冷却帯３の
ガス圧力制御部１２から加熱帯１および均熱帯２の比率
設定器１３に入力される炉圧制御結果により絶対圧が確
保でき、また各帯のガス圧力バランスは各帯のガス圧力
設定値により管理し、ガス圧力制御結果に基づき加熱帯
１および均熱帯２のガス圧力の配分比率を補正すること
で確保できるので、操業の自動化を図ることができると
共に、製品の品質向上を図ることができる。As described above, according to the present embodiment, the absolute pressure can be secured by the furnace pressure control result input from the gas pressure control unit 12 of the cooling zone 3 to the ratio setting device 13 of the heating zone 1 and the soaking zone 2. Also, the gas pressure balance of each zone can be secured by managing the gas pressure set value of each zone and correcting the distribution ratio of the gas pressure of heating zone 1 and soaking zone 2 based on the gas pressure control result, so automation of operation is possible. It is possible to improve the quality of the product.
【００２８】なお、上記実施例ではガス流量制御部９に
より比率設定器１３から入力されるガス圧力設定値と流
量センサ１０から入力されるガス流量検出信号とに基づ
いて調節弁１１を制御するようにしたが、ガス流量制御
部９および流量センサ１０を省略してガス圧力制御部１
２からの圧力フィードバック制御信号に比率設定器１３
で補正された比率を乗じた出力信号により調節弁１１を
制御するようにしてもよい。In the above embodiment, the control valve 11 is controlled by the gas flow rate control unit 9 based on the gas pressure set value input from the ratio setter 13 and the gas flow rate detection signal input from the flow rate sensor 10. However, the gas flow control unit 9 and the flow rate sensor 10 are omitted and the gas pressure control unit 1 is omitted.
The ratio setting device 13 is applied to the pressure feedback control signal from 2
The control valve 11 may be controlled by the output signal obtained by multiplying the ratio corrected by.
【００２９】また、上記実施例では冷却帯３のガス圧力
制御結果に基づいて加熱帯１、均熱帯２の比率設定器に
設定された配分比率を補正するようにしたが、加熱帯１
又は均熱帯２のガス圧力制御結果に基づいて均熱帯２と
冷却帯３又は加熱帯１と冷却帯３の比率設定器に設定さ
れた配分比率を補正するようにしてもよい。さらに、上
記実施例では図２に示す縦型の連続焼鈍炉を対象とした
が、図３に示す横型の連続焼鈍炉に対しても同様に適用
実施できることはいうまでもない。Further, in the above embodiment, the distribution ratio set in the ratio setting device for the heating zone 1 and the soaking zone 2 is corrected based on the gas pressure control result of the cooling zone 3.
Alternatively, the distribution ratio set in the ratio setting device of the soaking zone 2 and the cooling zone 3 or the heating zone 1 and the cooling zone 3 may be corrected based on the gas pressure control result of the soaking zone 2. Further, although the vertical continuous annealing furnace shown in FIG. 2 is targeted in the above embodiment, it is needless to say that the same can be applied to the horizontal continuous annealing furnace shown in FIG.
【００３０】[0030]
【発明の効果】以上述べたように本発明によれば、操業
の自動化を図り、且つ各帯のガス圧力バランスの管理を
分かり易くすると共に、絶対ガス圧力の確保、ガス圧力
バランスの確保を確実にして製品の品質向上を図ること
ができる連続焼鈍炉の炉内圧制御装置を提供できる。As described above, according to the present invention, it is possible to ensure the absolute gas pressure and the gas pressure balance while automating the operation and making the management of the gas pressure balance of each zone easy to understand. Thus, it is possible to provide a furnace pressure control device for a continuous annealing furnace capable of improving the quality of products.
【図１】本発明による連続焼鈍炉の炉内圧制御装置の一
実施例を示す系統構成図。FIG. 1 is a system configuration diagram showing an embodiment of a furnace internal pressure control device for a continuous annealing furnace according to the present invention.
【図２】縦型の連続焼鈍炉を示す構成説明図。FIG. 2 is a structural explanatory view showing a vertical continuous annealing furnace.
【図３】横型の連続焼鈍炉を示す構成説明図。FIG. 3 is a structural explanatory view showing a horizontal continuous annealing furnace.
【図４】（ａ）乃至（ｃ）は従来のそれぞれ異なる連続
焼鈍炉の炉内圧制御装置を示す系統構成図。4 (a) to 4 (c) are system configuration diagrams showing conventional furnace internal pressure control devices for different continuous annealing furnaces.
１……加熱帯、２……均熱帯、３……冷却帯、４……鋼
板、５……シールロール、６……ロール、７……圧力セ
ンサ、９……ガス流量制御部、１０……流量センサ、１
１……調節弁、１２……ガス圧力制御部、１３……比率
設定器。1 ... Heating zone, 2 ... Soaking zone, 3 ... Cooling zone, 4 ... Steel plate, 5 ... Seal roll, 6 ... Roll, 7 ... Pressure sensor, 9 ... Gas flow controller, 10 ... ... Flow sensor, 1
1 ... Control valve, 12 ... Gas pressure control unit, 13 ... Ratio setting device.
Claims (2)
それぞれ吹込まれる加熱帯、均熱帯および冷却帯の熱処
理部からなり、加熱帯から均熱帯、冷却帯に順次鋼材を
流して各帯で熱処理する連続焼鈍炉において、 各帯の内部のガス圧力を検出する圧力センサと、各帯の
圧力センサにより検出された検出信号に基づいてガス圧
力フィードバック制御信号を出力するガス圧力制御手段
と、各帯のガス圧力制御手段から入力されるガス圧力フ
ィードバック制御信号を各帯の圧力バランスに応じて設
定された配分比率を乗じてこれを各帯のガス圧力設定値
とし、この設定値に基づいて前記ガス供給系より各帯に
吹込まれる雰囲気ガス量を制御する比率設定手段と、前
記加熱帯、均熱帯および冷却帯の何ずれかの帯のガス圧
力制御結果に基づいて他の帯の比率設定器に設定された
配分比率を補正する補正手段とを備えたことを特徴とす
る連続焼鈍炉の炉圧制御装置。1. A heat treatment section of a heating zone, a soaking zone and a cooling zone into which an atmospheric gas is blown respectively through a gas supply system, and a steel material is sequentially flown from the heating zone to the soaking zone and the cooling zone for heat treatment in each zone. In the continuous annealing furnace, a pressure sensor that detects the gas pressure inside each zone, a gas pressure control unit that outputs a gas pressure feedback control signal based on the detection signal detected by the pressure sensor in each zone, and each zone The gas pressure feedback control signal input from the gas pressure control means is multiplied by the distribution ratio set according to the pressure balance of each band to obtain the gas pressure set value of each band, and the gas is set based on this set value. Ratio setting means for controlling the amount of atmospheric gas blown into each zone from the supply system, and other means based on the gas pressure control results of any of the heating zone, soaking zone and cooling zone Continuous annealing furnace of the furnace pressure control apparatus characterized by comprising a correction means for correcting the set distribution ratio to the ratio setter.
それぞれ吹込まれる加熱帯、均熱帯および冷却帯の熱処
理部からなり、加熱帯から均熱帯、冷却帯に順次鋼材を
流して各帯で熱処理する連続焼鈍炉において、 各帯の内部のガス圧力を検出する圧力センサと、各帯の
圧力センサにより検出されたガス圧力検出信号に基づい
てガス圧力フィードバック制御信号を出力するガス圧力
制御手段と、各帯のガス圧力制御手段から入力されるガ
ス圧力フィードバック制御信号を各帯の圧力バランスに
応じて設定された配分比率を乗じてこれを各帯のガス圧
力設定値として出力する比率設定手段と、前記加熱帯、
均熱帯および冷却帯の何ずれかの帯のガス圧力制御結果
に基づいて他の帯の比率設定手段に設定された配分比率
を補正する補正手段と、前記ガス供給系より各帯に吹込
まれるガス流量を検出する流量センサと、前記比率設定
手段より出力されるガス圧力設定値と前記流量センサに
より検出されたガス流量検出値に基づいて各帯に吹込ま
れるガス流量を制御するガス流量制御手段とを備えたこ
とを特徴とする連続焼鈍炉の炉圧制御装置。2. A heat treatment part of a heating zone, a soaking zone and a cooling zone into which atmospheric gas is blown respectively through a gas supply system, and a steel material is sequentially flown from the heating zone to the soaking zone and the cooling zone for heat treatment in each zone. In the continuous annealing furnace, a pressure sensor that detects the gas pressure inside each zone, and a gas pressure control unit that outputs a gas pressure feedback control signal based on the gas pressure detection signal detected by the pressure sensor in each zone, A gas pressure feedback control signal input from the gas pressure control means of each band is multiplied by a distribution ratio set according to the pressure balance of each band, and a ratio setting means for outputting this as a gas pressure set value of each band, The heating zone,
Correction means for correcting the distribution ratio set in the ratio setting means of the other zones based on the gas pressure control result of some zones of the soaking zone and the cooling zone, and blown into each zone from the gas supply system. A flow rate sensor for detecting the gas flow rate, and a gas flow rate control for controlling the gas flow rate blown into each zone based on the gas pressure set value output from the ratio setting means and the gas flow rate detection value detected by the flow rate sensor. And a furnace pressure control device for a continuous annealing furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2685894A JPH07233420A (en) | 1994-02-24 | 1994-02-24 | Device for controlling furnace pressure in continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2685894A JPH07233420A (en) | 1994-02-24 | 1994-02-24 | Device for controlling furnace pressure in continuous annealing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07233420A true JPH07233420A (en) | 1995-09-05 |
Family
ID=12204984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2685894A Pending JPH07233420A (en) | 1994-02-24 | 1994-02-24 | Device for controlling furnace pressure in continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07233420A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004024959A1 (en) * | 2002-09-13 | 2004-03-25 | Drever International S.A. | Atmosphere control during continuous heat treatment of metal strips |
| KR100973886B1 (en) * | 2003-07-16 | 2010-08-03 | 주식회사 포스코 | Apparatus for controlling press of annealing furnace during atmosphere gas change |
| CN102534138A (en) * | 2011-12-31 | 2012-07-04 | 海盐华辰工业炉有限公司 | Oxygen potential control system of spheroidizing annealing furnace |
| JP2013544969A (en) * | 2010-10-26 | 2013-12-19 | 宝山鋼鉄股▲分▼有限公司 | Method and apparatus for controlling furnace pressure in a continuous annealing furnace |
| CN104046768A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | System and method for controlling furnace pressure of continuous annealing furnace |
-
1994
- 1994-02-24 JP JP2685894A patent/JPH07233420A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004024959A1 (en) * | 2002-09-13 | 2004-03-25 | Drever International S.A. | Atmosphere control during continuous heat treatment of metal strips |
| BE1015109A3 (en) * | 2002-09-13 | 2004-10-05 | Drever Internat S A | Process traitemant thermal metal strip. |
| EA008419B1 (en) * | 2002-09-13 | 2007-04-27 | Древер Энтернасьональ, С.А. | Method for metal strip heat treatment |
| US7384489B2 (en) | 2002-09-13 | 2008-06-10 | Drever International S.A. | Atmosphere control during continuous heat treatment of metal strips |
| KR100973886B1 (en) * | 2003-07-16 | 2010-08-03 | 주식회사 포스코 | Apparatus for controlling press of annealing furnace during atmosphere gas change |
| JP2013544969A (en) * | 2010-10-26 | 2013-12-19 | 宝山鋼鉄股▲分▼有限公司 | Method and apparatus for controlling furnace pressure in a continuous annealing furnace |
| CN102534138A (en) * | 2011-12-31 | 2012-07-04 | 海盐华辰工业炉有限公司 | Oxygen potential control system of spheroidizing annealing furnace |
| CN104046768A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | System and method for controlling furnace pressure of continuous annealing furnace |
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