EP0545768B1 - Procédé et dispositif de conduite automatique d'un four de recuit continu à rayonnement par tubes radiants - Google Patents
Procédé et dispositif de conduite automatique d'un four de recuit continu à rayonnement par tubes radiants Download PDFInfo
- Publication number
- EP0545768B1 EP0545768B1 EP92403141A EP92403141A EP0545768B1 EP 0545768 B1 EP0545768 B1 EP 0545768B1 EP 92403141 A EP92403141 A EP 92403141A EP 92403141 A EP92403141 A EP 92403141A EP 0545768 B1 EP0545768 B1 EP 0545768B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- furnace
- strip
- zone
- speed
- 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.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Definitions
- the present invention relates to a method of automatic operation of a continuous annealing furnace at radiation by radiant tubes of the type comprising several heating zones at separate temperatures used in particular to carry out heat treatments different continuous bands connected between them and requiring specific annealing operations.
- the strips are welded together before going into the oven continuous annealing.
- the thermal inertia of the oven being relatively large it is impossible to vary this temperature immediately for the heat treatment of the next strip.
- the thermal inertia of an oven with radiant tubes can be three degrees Celsius per minute; if you want to go from a 750 ° regime to a 800 ° speed, this results in a 50 ° variation, which requires a transition time of 15 to 20 minutes. If the tape runs, for example, at 100 meters / minute, this corresponds to a length of 2 km of strip.
- intermediate bands are currently being introduced between two bands requiring different heat treatments. It is when passing these intermediate bands that the oven temperature will vary so as to be at the right temperature when the tape arrives next.
- the intermediate belt is then downgraded and can be reused for similar purposes, except in the case where the strip has been continuously coated after treatment thermal.
- the temperature control of the different zones of the oven is on the other hand managed by the operator, who depending on the characteristics of the bands present in the oven and arriving rule from an array of controls the temperature setpoints for each of the oven areas.
- This solution has the disadvantage of requiring the use of intermediate bands which represent a large amount of metal lost, not to use the oven at all times, especially when passage of these intermediate bands, and not optimize the amount of energy spent to power the ovens, since an operator indicates the instructions for heats each of the oven zones empirically.
- a mixed radiation oven is then obtained by radiant tubes and forced convection by gas jets (see also FR-A-2 406 667 and EP-A-0 181 830).
- the object of the invention is to propose a method automatic operation of a continuous annealing furnace at radiation by radiant tubes to avoid the use of intermediate bands, without use a device with forced convection.
- the subject of the invention is a method automatic operation of a continuous annealing furnace at radiation by radiant tubes of the type comprising several successive heating zones at temperatures separate, used in particular to perform treatments continuous thermal different from connected strips between them and requiring annealing operations specific.
- This process comprises the steps indicated in claim 1.
- oven temperature we actually designate either the temperature of the oven atmosphere or the temperature of the heat exchange on a standard surface, for example 1 m 2 . This oven temperature must be distinguished from a temperature resulting from radiation from the strip or from the walls of the oven.
- An automatic oven control process continuous annealing manages for each furnace areas the modification of two types of settings.
- the method consists in determining the speed of the strip in the oven and the speed at which it must scroll in the event of a change of speed, and we calculate the moment from which it takes modify the speed setpoints.
- Each part of the oven which can be controlled individually, i.e. having own adjustment means making it possible to modify temperature conditions in this area without modify the conditions in neighboring areas.
- the process acquires the value of speed target to be reached and the instant the speed should be reached, determines the transient parameters in speed and temperature to apply for the change speed does not affect the heat treatment of bands.
- Transient parameters in speed and temperature are determined taking into account possible transients due to changes in thermal cycle in progress or planned.
- the maximum time is equal to the product passage time to which this transition applies and, on the other hand, the instructions relating to a transition are determined with anticipation equivalent to dead time and at the establishment time between the initial state and the state final.
- the invention Taking into account the necessary heat treatment to the strip following that being processed, and line speed, the following process the invention provides for the calculation of temperature setpoints of the oven which will be applied to the different zones of the oven during the transition and in particular the duration and the slope of the temperature ramps.
- the start date of variation of the adjustment setpoints is determined at passage of the weld between the two strips at the outlet from said oven area. From this date, the temperature is lowered according to a law of variation parameterized referring to a product class and based on portions of linear variation with duration and variable slope, up to treatment temperature of the second band.
- the processing temperature thermal of a metal can be higher than the target temperature without damage to it, as long as we stay within the limits provided by the criteria metallurgical, while a lower temperature does not does not meet the conditions for the smooth running of the treatment.
- Characteristic information specific to each band are provided by a system IT management and transmitted directly to suitable computers which generate instructions for apply to equipment.
- the machines and the various measurement sensors distributed along the line in particular in each zone of the oven, provide information on the progress of the tape, which allows to make follow-up of each product along the line from the input pads to the output pads.
- Figure 3 shows the evolution of the temperature setpoint of an oven zone whose outlet is marked by line 13 (figure 1) from the moment I between temperatures T1 and T2 with higher T1 at T2 taking into account an additional anticipation corresponding to the dead time due to the inertia of the furnace.
- the ramp of negative slope begins on passing from the connection point between bands 11 and 12 to the instant I corresponding to a distance Dm before the end the area of the oven whose temperature is sought to be controlled.
- the gradual drop in temperature takes place during the passage of the strip 12 requiring the most low temperature T2 over a distance From after the exit of said area.
- the time interval LA corresponds at idle time due to the inertia of the oven and the interval from AB time to the establishment time of the new oven temperature.
- the distances Dm and De correspond respectively at these time intervals.
- the opposite situation is described in the figures 4 and 5 since it concerns the passage of a low band thickness denoted 11 to a strip of greater thickness denoted 12.
- the strip 11 requires heat treatment at temperature T1 and strip 12 heat treatment at temperature T2 with T1 lower than T2.
- the figure 4 represents the position of the two respective bands at three separate instants, the initial instant A, the instant intermediate B and the final instant F corresponding to the end of transition.
- the transition of temperature takes place at time A, that is to say when the strip 12 is at a distance De + Dm from the entrance to the area.
- Intermediate B represents the end of the dead time while the weld is at distance From the entrance to the area.
- the final moment F is such that during the passage of the weld between the band 11 and band 12, taking into account an anticipation additional to take into account the delay due at idle time, at the entrance to the oven area, the oven has already acquired the temperature T2 necessary for the treatment of strip 12.
- the variation of the temperature of the zone is therefore carried out by applying temperature setpoints increasing continuously from the moment A from temperature T1 to temperature T2.
- the time interval AB corresponds to the dead time and the time interval BF to the establishment time.
- the corresponding dead time distances Dm and establishment time De are distributed differently since in this case, it is necessary that at the final moment F, the new higher set temperature, obtained.
- the method according to the invention provides here for determine from the forward speed of the band and characteristics of the oven and the class of product, the date of the start of the temperature ramp as well as the value of its slope.
- the process calculates the law of variation of the temperature to be applied for the transition between the strip next and the tape again afterwards and eventually hands over involved the previously calculated transition between the strip leaving the oven area and the next strip, especially when this must cause a drop in temperature.
- the process acquires the value of the target speed to reach and the instant when the speed target must be reached.
- the computer determines the transient in speed and temperature to be applied so that shifting does not affect processing thermal bands, i.e. the start time of the changes in temperature and speed and the laws of changes in speed and temperature.
- the process allows after having detected the gear change triggering a transient on the temperature to adapt to the new speed.
- FIG. 1 we can see the diagram of a device for implementing the following method the invention comprising a continuous annealing furnace 1 consisting of six distinct zones 1A to 1F across from which passes a strip 2 shown during treatment, followed by a strip 3 welded to the strip 2 along a weld zone 4.
- This weld zone 4 includes a hole 5 opening on each side of the strip and allowing the location thereof, at points individuals of the line, during its scrolling, at by means of sensors 6.
- the position as well as the speed of the tape are determined by measurement sensors 22 installed on the different rollers 23 of the line and which, given the tape speed and roll radius which drive it, integrate the abscissa of the band. These sensors are connected to the processing unit information 7.
- Band 8 temperature sensors are placed in each of the different areas of the oven.
- the information collected by these sensors 8 is transmitted to the information processing unit 7.
- Des means of storing information and programs 9 are also provided and connected to the processing unit information 7.
- This unit 7 controls devices 10 for adjusting the temperature of each zone of the oven, as well as a speed control device advancement of the strip not shown in Figure 1.
- An information display device 21 collected at the furnace level and at the eastern strips also intended to inform the operator and allow him to order the installation under certain circumstances particular.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Articles (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Looms (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
- la figure 1 représente un schéma d'un dispositif dans la mise en oeuvre du procédé ;
- la figure 2 représente un schéma de la position de trois bandes successives de section décroissante à deux instants donnés ;
- la figure 3 représente le schéma de l'évolution des consignes et de températures d'une zone d'un four en fonction du temps ;
- la figure 4 représente un schéma de la position de trois bandes successives de section croissante à deux instants donnés ; et
- la figure 5 représente le schéma de l'évolution des consignes et de températures d'une zone du four en fonction du temps correspondant à la situation de la figure 4.
- à déterminer les caractéristiques géométriques de la bande qui entre dans la zone du four, en particulier son épaisseur et sa largeur, le cycle thermique à lui faire subir et les consignes de température à appliquer à la zone du four pour réaliser le cycle thermique, ainsi que les caractéristiques géométriques de la bande suivant celle qui est dans la zone du four et le cycle thermique à lui faire subir ;
- à calculer au moyen d'une loi de commande en fonction des conditions de la bande dans la zone du four, des conditions de la suivante et des contraintes dues aux caractéristiques du four, la durée de transition optimale pour que la zone du four passe de la température pour réaliser le cycle thermique de la bande qui est dans ladite zone à la température pour réaliser le cycle thermique de la bande suivante, et le moment à partir duquel il faut modifier les consignes de température de la zone du four, pour assurer le cycle thermique de la bande suivant celle située dans la zone du four, sans que la température soit inférieure à la température nécessaire au cycle thermique de la bande située dans ladite zone, ainsi que la loi de variation de la température dans ladite zone ;
- à envoyer au dispositif de pilotage du four les consignes de variation de température.
Claims (10)
- Procédé de conduite automatique d'un four de recuit continu à rayonnement par tubes radiants et à inertie thermique importante du type comprenant plusieurs zones successives de chauffage à des températures distinctes et contrôlables individuellement, et un dispositif de pilotage du four, le four étant utilisé notamment pour effectuer des traitements thermiques différents en continu de bandes raccordées entre elles et nécessitant des opérations de recuit spécifiques, dans lequel :on détermine la position des extrémités de bandes, la vitesse d'avancement de la bande, la température dans chacune des zones du four,on détermine pour chaque zone du four les caractéristiques géométriques de la bande qui entre dans la zone du four, en particulier son épaisseur et sa largeur, le cycle thermique à lui faire subir et les consignes de température à appliquer à la zone du four pour réaliser le cycle thermique, ainsi que les caractéristiques géométriques de la bande suivant celle qui est dans la zone du four et le cycle thermique à lui faire subir, caractérisé en ce que :on calcule pour chaque zone du four au moyen d'une loi de commande en fonction des conditions de la bande dans la zone du four, des conditions de la bande suivante et des contraintes dues aux caractéristiques du four,la durée de transition optimale pour que la zone du four passe de la température pour réaliser le cycle thermique de la bande qui est dans ladite zone à la température pour réaliser le cycle thermique de la bande suivante, etle moment à partir duquel il faut modifier les consignes de température de la zone du four, pour assurer le cycle thermique de la bande suivant celle située dans la zone du four, sans que la température soit inférieure à la température nécessaire au cycle thermique de la bande située dans ladite zone, ainsi que la loi de variation de la température dans ladite zone ; eton envoie au dispositif de pilotage du four les consignes de variation de température.
- Procédé de conduite automatique d'un four de recuit continu suivant la revendication 1, caractérisé en ce que l'on contrôle la température des différentes zones du four en appliquant pendant les phases de transition des consignes de température du four dont on calcule la date de déclenchement, la durée et la pente à partir des paramètres mesurés des caractéristiques des bandes, et des autres paramètres provenant des différentes classes de produit.
- Procédé de conduite automatique d'un four de recuit continu suivant l'une quelconque des revendications 1 et 2, caractérisé en ce que le temps maximal d'une transition de température est celui du traitement du produit sur lequel s'applique cette transition et en ce que les consignes relatives à une transition sont déterminées avec une anticipation équivalente au temps d'établissement des températures additionné d'un temps mort dû à l'inertie de la zone dudit four.
- Procédé de conduite automatique d'un four de recuit continu suivant l'une quelconque des revendications 1 à 3, caractérisé en ce queparallèlement, on détermine la vitesse de la bande dans le four et la vitesse à laquelle elle doit défiler dans le cas d'un changement de vitesse, et on calcule le moment à partir duquel il faut modifier les consignes de vitesse.
- Procédé de conduite automatique d'un four de recuit continu suivant la revendication 4, dans lequel la vitesse d'avancement de la bande doit être modifiée, caractérisé en ce que :on acquiert la valeur de la vitesse cible à atteindre et l'instant où la vitesse doit être atteinte;on détermine les paramètres des transitoires en vitesse et en température à appliquer pour que le changement de vitesse n'affecte pas le traitement thermique des bandes.
- Procédé de conduite automatique d'un four de recuit continu suivant la revendication 4 ou 5, caractérisé en ce que les paramètres des transitoires en vitesse et en température sont déterminés en tenant compte des éventuels transitoires dus à des changements de cycle thermique en cours ou prévus.
- Procédé de conduite automatique d'un four de recuit continu suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on recalcule périodiquement les conditions de transition pour prendre en compte toute évolution du point de fonctionnement sur le produit en cours par rapport aux prévisions.
- Procédé de conduite automatique d'un four de recuit continu suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on applique des rampes de température décroissantes afin d'adapter la température d'une zone du four d'une première valeur à une seconde valeur inférieure lorsque le début de la bande nécessitant la seconde valeur de ladite zone du four, arrive à une distance prévue (Dm) avant la sortie de ladite zone du four.
- Procédé de conduite automatique d'un four de recuit continu suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on applique par anticipation des rampes de température croissantes afin d'adapter la température d'une zone du four d'une première valeur à une seconde valeur supérieure pendant la présence de la bande précédant celle nécessitant la seconde valeur de température de telle sorte que ladite température soit atteinte lors de l'entrée de ladite bande dans ladite zone du four.
- Procédé de conduite automatique d'un four de recuit continu suivant l'une quelconque des revendications précédentes, caractérisé en ce que l'on limite les variations de température des zones du four lorsque l'on note une succession de trois bandes nécessitant respectivement des températures élevées, faibles, puis élevées lors du passage de la bande nécessitant un traitement à faible température.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9114724 | 1991-11-28 | ||
FR9114724A FR2684436B1 (fr) | 1991-11-28 | 1991-11-28 | Procede et dispositif de conduite automatique d'un four de recuit continu. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0545768A1 EP0545768A1 (fr) | 1993-06-09 |
EP0545768B1 true EP0545768B1 (fr) | 1998-03-04 |
Family
ID=9419447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92403141A Expired - Lifetime EP0545768B1 (fr) | 1991-11-28 | 1992-11-20 | Procédé et dispositif de conduite automatique d'un four de recuit continu à rayonnement par tubes radiants |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0545768B1 (fr) |
AT (1) | ATE163685T1 (fr) |
DE (1) | DE69224596T2 (fr) |
ES (1) | ES2114923T3 (fr) |
FR (1) | FR2684436B1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2820148B1 (fr) | 2001-01-31 | 2003-10-31 | Stein Heurtey | Perfectionnements apportes aux procedes de chauffage de bandes d'acier dans des fours verticaux |
DE10337502B4 (de) * | 2003-08-14 | 2006-03-30 | Kramer, Carl, Prof. Dr.-Ing. | Verfahren zum Betrieb einer Durchlauf-Wärmebehandlungsanlage für Warenbahnen und Bänder mit überwiegend konvektiver Wärmeübertragung |
CN115522040B (zh) * | 2021-06-25 | 2024-06-04 | 宝山钢铁股份有限公司 | 一种冷轧连续退火炉温度自动控制方法 |
CN115074496B (zh) * | 2022-05-19 | 2023-08-15 | 首钢京唐钢铁联合有限责任公司 | 连续退火炉的控制方法、装置、介质和电子设备 |
CN116732307B (zh) * | 2023-06-15 | 2024-06-18 | 宁波固远管件有限公司 | 一种管件退火方法、系统、存储介质及智能终端 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2326135A1 (de) * | 1973-05-23 | 1974-12-12 | Krupp Gmbh | Verfahren zur temperaturregelung in durchlaufwaermeoefen |
JPS5924166B2 (ja) * | 1977-10-20 | 1984-06-07 | 新日本製鐵株式会社 | ストリツプの連続加熱に於ける板温制御方法 |
US4316717A (en) * | 1980-10-27 | 1982-02-23 | Midland-Ross Corporation | Method of controlling strip temperatures |
DE3583212D1 (de) * | 1984-11-08 | 1991-07-18 | Mitsubishi Heavy Ind Ltd | Verfahren und vorrichtung zum erwaermen eines metallbandes in einem durchlaufgluehofen. |
-
1991
- 1991-11-28 FR FR9114724A patent/FR2684436B1/fr not_active Expired - Fee Related
-
1992
- 1992-11-20 DE DE69224596T patent/DE69224596T2/de not_active Expired - Fee Related
- 1992-11-20 ES ES92403141T patent/ES2114923T3/es not_active Expired - Lifetime
- 1992-11-20 EP EP92403141A patent/EP0545768B1/fr not_active Expired - Lifetime
- 1992-11-20 AT AT92403141T patent/ATE163685T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69224596T2 (de) | 1998-11-12 |
ATE163685T1 (de) | 1998-03-15 |
FR2684436A1 (fr) | 1993-06-04 |
DE69224596D1 (de) | 1998-04-09 |
EP0545768A1 (fr) | 1993-06-09 |
ES2114923T3 (es) | 1998-06-16 |
FR2684436B1 (fr) | 1998-02-06 |
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