FR2551849A1 - CONTINUOUS OVEN CONTROL - Google Patents

CONTINUOUS OVEN CONTROL Download PDF

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Publication number
FR2551849A1
FR2551849A1 FR8413584A FR8413584A FR2551849A1 FR 2551849 A1 FR2551849 A1 FR 2551849A1 FR 8413584 A FR8413584 A FR 8413584A FR 8413584 A FR8413584 A FR 8413584A FR 2551849 A1 FR2551849 A1 FR 2551849A1
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FR
France
Prior art keywords
oven
temperature
furnace
heated
length
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.)
Granted
Application number
FR8413584A
Other languages
French (fr)
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FR2551849B1 (en
Inventor
Helmuth Klammer
Wolfram Schupe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of FR2551849A1 publication Critical patent/FR2551849A1/en
Application granted granted Critical
Publication of FR2551849B1 publication Critical patent/FR2551849B1/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1932—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
    • G05D23/1934—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces each space being provided with one sensor acting on one or more control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
    • F27D2019/004—Fuel quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
    • F27M2001/1539—Metallic articles
    • F27M2001/1547—Elongated articles, e.g. beams, rails
    • F27M2001/1552—Billets, slabs

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Tunnel Furnaces (AREA)
  • Control Of Heat Treatment Processes (AREA)

Abstract

COMMANDE DE FOUR EN CONTINU. SELON L'INVENTION, CETTE COMMANDE DE FOUR EN CONTINU EST CARACTERISEE EN CE QUE A DIFFERENTES REPRISES SUR LA LONGUEUR DU FOUR ET DE FACON SEQUENTIELLE, L'ON DETERMINE UNE OU PLUSIEURS DONNEES SUR LE CHAUFFAGE DU FOUR, EN CE QUE LES VALEURS DE MESURE SONT UNIFORMEMENT ET PROGRESSIVEMENT TRANSFORMEES EN CHANGEMENT DE TEMPERATURE DES PIECES A RECHAUFFER ET LA TEMPERATURE DE CHAQUE PIECE A RECHAUFFER SE TROUVANT DANS LA LONGUEUR DU FOUR EST DETERMINEE COMME TEMPERATURE REELLE, EN CE QUE LA TEMPERATURE REELLE EST COMPAREE A DIFFERENTES TEMPERATURES DE REFERENCE PREDETERMINEES LOCALEMENT SUR LA LONGUEUR DU FOUR ET EN CE QUE DANS LES ZONES OU ON CONSTATE UNE DIFFERENCE, IL EN RESULTE UNE MODIFICATION DU CHAUFFAGE DU FOUR.CONTINUOUS OVEN CONTROL. ACCORDING TO THE INVENTION, THIS CONTINUOUS OVEN CONTROL IS CHARACTERIZED IN THAT A DIFFERENT TAKES ON THE LENGTH OF THE OVEN AND SEQUENTIALLY, ONE OR MORE DATA ON THE HEATING OF THE OVEN, IN THAT THE MEASURED VALUES ARE UNIFORMELY AND GRADUALLY TRANSFORMED INTO CHANGE IN TEMPERATURE OF THE ROOMS TO BE REHEATED AND THE TEMPERATURE OF EACH ROOM TO BE REHEATED, WHICH IS IN THE LENGTH OF THE OVEN, IS DETERMINED AS THE REAL TEMPERATURE, IN THAT THE REAL TEMPERATURE IS PREDIFFERATED TO DIFFERENTIATE TO DIFFERENT TEMPERATURE THE LENGTH OF THE OVEN AND IN THAT IN THE AREAS WHERE A DIFFERENCE IS OBSERVED, THERE IS A CHANGE IN THE OVEN HEATING.

Description

1 La présente invention concerne une commande de four en continu. Jusqu'àThe present invention relates to continuous furnace control. Until

présent, les commandes pour des fours en continu sont conçues pour que le matériau à réchauffer parcourt uniformément le four et que le foyer du four soit uniformément chargé Lorsque la matière dans le four possède des dimensions différentes et qu'il y a des interruptions entre les pièces individuelles qui traversent, l'échauffement régulier de la matière dans le four est perturbé On constate, par exemple, des évolutions de température sur le matériau à réchauffer à proximité des interruptions De plus, une qualité différente du matériau à réchauffer peut provoquer un échauffement inégal Des différences de température du matériau à réchauffer plus grandes apparais15 sent également, quand, par exemple à la suite d'une interruption du fonctionnement dans la zone de finition succàdant au four, la vitesse de passage doit être modifiée, ou bien quand la vitesse de passage se modifie à plusieurs reprises. L'objet de la présente invention est de produire un échauffement uniforme du matériau à réchauffer lors de différents passages, dans lequel, lors de l'échauffement du matériau à réchauffer, on prenne en compte également des  now, the controls for continuous furnaces are designed so that the material to be heated travels uniformly through the oven and the furnace hearth is uniformly loaded When the material in the furnace has different dimensions and there are interruptions between individual pieces that pass through, the regular heating of the material in the furnace is disturbed There are, for example, changes in temperature on the material to be heated near interruptions In addition, a different quality of the material to be heated can cause a warm-up Uneven temperature differences in the material to be heated up also occur when, for example following an interruption of operation in the finishing area succeeding the oven, the speed of passage must be changed, or when the speed passage changes several times. The object of the present invention is to produce a uniform heating of the material to be heated during different passages, in which, during the heating of the material to be heated, it is also possible to take into account

irrégularités dans le passage et l'occupation du foyer.  irregularities in the passage and occupation of the home.

A cet effet selon l'invention, la commande de four continu est caractérisée en ce que à différentes reprises sur la longueur du four et de façon séquentielle, l'on détermine une ou plusieurs données sur le chauffage du four, en ce que les valeurs de mesure sont uniformément et progressivement 30 transformées en changement de température des pièces à réchauffer et la température de chaque pièce à réchauffer se trouvant dans la longueur du four est déterminée comme 1 température réelle, en ce que la température réelle est comparée à différentes températures de référence prédéterminées localement sur la longueur du four et en ce que dans les zones o on constate une différence, il en résulte une modification du chauffage du four Pour déterminer la température réelle du matériau à chauffer, on peut utiliser soit la température de l'atmosphère du four, soit les  For this purpose according to the invention, the continuous furnace control is characterized in that at different times over the length of the furnace and sequentially, one or more data are determined on the furnace heating, in that the values The temperature is uniformly and progressively transformed into a temperature change of the parts to be heated and the temperature of each room to be heated in the length of the oven is determined as the actual temperature, in that the actual temperature is compared with different temperatures of the oven. reference predetermined locally over the length of the furnace and in the areas where there is a difference, it results in a change in heating of the furnace To determine the actual temperature of the material to be heated, it is possible to use either the temperature of the atmosphere of the oven,

quantités de combustible et d'air utilisées.  quantities of fuel and air used.

Il est en règle générale impossible dans l'industrie 10 métallurgique, de mesurer directement dans le four la température du matériau à réchauffer Il est d'importance, pour cette raison, d'enregistrer plusieurs valeurs de mesures, à plusieurs reprises sur la longueur du four et de façon séquentielle, valeurs qui sont appropriées à 15 déterminer, isqlément et en continu l'élévation de température des pièces du matériau à réchauffer Les  It is generally impossible in the metallurgical industry to measure directly in the furnace the temperature of the material to be heated. It is important, for this reason, to record several measurement values several times over the length of the furnace. and, sequentially, values which are suitable for determining, in part and continuously, the temperature rise of the pieces of material to be heated.

procédés de calcul mathématiques pour ce faire sont connus.  Mathematical calculation methods for doing this are known.

Ils partent de l'équation différentielle de Fourier, qui est résoluble au moins itérativement pour les conditions d'un 20 four industriel déterminé, avec l'aide d'installations de calcul électroniques Ainsi on arrive, par séquence, à des valeurs pour l'élévation de température et par l'addition des valeurs pour chaque pièce, à partir de l'introduction dans le four, à des données sur sa température représenta25 tive (température réelle) et à sa situation dans le four  They start from the Fourier differential equation, which is at least iteratively resolvable for the conditions of a given industrial furnace, with the aid of electronic computing facilities. Thus, one arrives, in sequence, at values for the temperature rise and by adding the values for each room, from the introduction into the oven, to data on its temperature (actual temperature) and its position in the oven

(zone de réglage).(adjustment zone).

Cette température réelle du matériau à réchauffer ainsi obtenue sera comparée à une température de référence, qui est donnée, à chaque fois, localement sur la longueur du four Sur la base d'une différence entre température réelle et de référence et en fonction de la grandeur de cette différence, le four est réglé par zones Naturellement, lorsque la zone de réglage est plus longue que la pièce du 1 matériau à réchauffer individuelle, le four n'est pas réglé pour chaque pièce individuellement mais toujours uniquement  This actual temperature of the material to be heated thus obtained will be compared with a reference temperature, which is given, each time, locally over the length of the furnace On the basis of a difference between actual and reference temperature and depending on the size of this difference, the oven is adjusted by zones Naturally, when the adjustment zone is longer than the part of the 1 material to be heated individually, the oven is not set for each piece individually but always only

par zone.by zone.

La commande selon l'invention se révèle connue parfaitement appropriée pour accomplir un réchauffement très uniforme lors d'un passage irrégulier et d'une charge du foyer inégalement dense Il est très avantageux que le chauffage du four puisse être adapté à l'allure conditionnée par les dimensions ou dépendante de la vitesse de passage ou bien 10 soit adapté automatiquement Conformément au procédé selon l'invention, on obtient en outre un rendement thermique de la chaleur supérieur et le procédé se révèle, avec cela, comme économique en l'énergie Au reste, les coûts de la  The control according to the invention is known to be perfectly suitable for achieving a very uniform heating during uneven passage and an unevenly dense load of the hearth. It is very advantageous that the heating of the oven can be adapted to the pace conditioned by In accordance with the process according to the invention, a thermal efficiency of the higher heat is also obtained, and the process is thus found to be economical in terms of energy. remain, the costs of

commande restent dans des limites qui sont justifiées rien 15 que par l'économie d'énergie.  control remain within limits that are justified only by energy saving.

L'unique figure du dessin annexée fera bien comprendre  The single figure of the appended drawing will make it clear

comment l'invention peut être réalisée.  how the invention can be realized.

Cette figure unique montre une vue latérale d'un four  This unique figure shows a side view of an oven

continu pourvu d'une commande selon l'invention.  continuous provided with a command according to the invention.

Sur cette figure, la ligne 1 tracée d'un trait épais caractérise la chemise réfractaire de la chambre du four avec l'entrée 2 et la sortie 4 pour le matériau à réchauffer 3 Le four est équipé avec, à chaque fois, une rangée de brûleurs 5 dans le four supérieur et de brûleurs 6 dans le 25 four inférieur A chaque fois deux brûleurs du four  In this figure, the line 1 drawn with a thick line characterizes the refractory lining of the oven chamber with the inlet 2 and the outlet 4 for the material to be heated. The oven is equipped with, each time, a row of burners 5 in the upper oven and burners 6 in the lower oven Each time two burners of the oven

supérieur et du four inférieur forment une zone de réglage.  upper and lower furnace form an adjustment zone.

Dans le cas présent, le four possède six zones de réglage.  In this case, the oven has six adjustment zones.

Les brûleurs 5,6 amènent au four du gaz combustible et de l'air Le courant de gaz brûlé s'écoule à contre-courant de 30 celui du transport du matériau à réchauffer vers la sortie  The burners 5,6 bring into the furnace fuel gas and air The flue gas stream flows in countercurrent with that of the transport of the material to be heated to the outlet

de gaz brûlé en 7.of gas burned in 7.

1 Le matériau à réchauffer 3 pénètre dans le four par l'entrée 2 et, du fait que le matériau à réchauffer se trouve dans le four comme il ressort de la figure en pièces serrées les unes derrière les autres, il est transporté par le mouvement du poussoir de brames 8 sur le foyer 9, à travers le four,  1 The material to be heated 3 enters the furnace through the inlet 2 and, because the material to be heated is in the furnace as is apparent from the figure in tight pieces one behind the other, it is transported by the movement slab pusher 8 on the hearth 9, through the oven,

jusqu'à la sortie 4.to exit 4

Le four est équipé d'un capteur 10 pour la mesure de la température de l'atmosphère du four dans chaque section de réglage Dans le cas présent, un capteur est prévu pour 10 ehaque zone de réglage pour chaque four inférieur et supérieur Sur l'unique figure, sont représentés, en outre un calculateur 11, une ligne d'enregistrement de température 12, une ligne de commande de brûleurs 13 et une ligne 14  The oven is equipped with a sensor 10 for measuring the temperature of the oven atmosphere in each adjustment section. In this case, a sensor is provided for each adjustment zone for each lower and upper oven. FIG. 1 is a computer 11, a temperature recording line 12, a burner control line 13 and a line 14.

pour la transmission de données sur la vitesse de passage du 15 matériau à réchauffer 3.  for the transmission of data on the speed of passage of the material to be heated 3.

25518 X 925518 X 9

Claims (2)

REVENDICATIONS 1 1 Commande de four en continu, caractérisée en ce que, à différentes reprises sur la longueur du four et de façon séquentielle, l'on détermine une ou plusieurs données sur le chauffage du four, en ce que les valeurs de mesure sont uniformément et progressivement transformées en changement de température des pièces à réchauffer et la température de chaque pièce à réchauffer se trouvant dans la longueur du four est déterminée comme température réelle, en ce que la température réelle est comparée à différentes températures de référence prédéterminées localement sur la longueur du four et en ce que dans les zones o on constate une différence, il en résulte une modification du chauffage du four 2 Commande de four en continu selon la revendication 1, 15 caractérisée en ce que la température de l'atmosphère du  Continuous furnace control, characterized in that, at different times over the length of the furnace and sequentially, one or more furnace heating data is determined, in that the measured values are uniformly and progressively transformed into a change in temperature of the parts to be heated and the temperature of each room to be heated in the length of the oven is determined as the actual temperature, in that the actual temperature is compared with different reference temperatures predetermined locally over the length of the and in that in the zones where a difference is found, the furnace 2 continuous furnace control is continuously modified according to claim 1, characterized in that the temperature of the atmosphere of the furnace four est mesurée pour déterminer la température réelle.  oven is measured to determine the actual temperature. 3 Commande de four en continu selon la revendication 1, caractérisée en ce que les quantités de combustibles et  Continuous furnace control according to claim 1, characterized in that the fuel quantities and d'air sont mesurées pour déterminer la température réelle.  of air are measured to determine the actual temperature.
FR848413584A 1983-09-09 1984-09-03 CONTINUOUS OVEN CONTROL Expired FR2551849B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833332989 DE3332989A1 (en) 1983-09-09 1983-09-09 CONTINUOUS CONTROL

Publications (2)

Publication Number Publication Date
FR2551849A1 true FR2551849A1 (en) 1985-03-15
FR2551849B1 FR2551849B1 (en) 1989-03-17

Family

ID=6208938

Family Applications (1)

Application Number Title Priority Date Filing Date
FR848413584A Expired FR2551849B1 (en) 1983-09-09 1984-09-03 CONTINUOUS OVEN CONTROL

Country Status (4)

Country Link
DE (1) DE3332989A1 (en)
FR (1) FR2551849B1 (en)
GB (1) GB2146464B (en)
IT (1) IT1176575B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794132A1 (en) * 1999-05-27 2000-12-01 Stein Heurtey Improved control of the temperature profile in a furnace for the reheating of steel products such as slabs and billets for subsequent rolling operations

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900005989B1 (en) * 1985-02-27 1990-08-18 미쓰비시전기 주식회사 Heating control method for heat frunace
JPH06281364A (en) * 1993-03-30 1994-10-07 Ngk Insulators Ltd Temperature control method for heating furnace
DE19506066C2 (en) * 1995-02-22 1997-06-05 Junker Gmbh O Process for operating a heating system for metallic goods
CA2180618A1 (en) * 1995-07-17 1997-01-18 Dennis J. Vaseloff Food warmer foil heater and sensor assembly including plural zone heater assembly
US7133726B1 (en) * 1997-03-28 2006-11-07 Applera Corporation Thermal cycler for PCR
DE50010559D1 (en) * 2000-04-11 2005-07-21 Siempelkamp Handling Sys Gmbh Preheating technology with power throttling during service interruptions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2001974A1 (en) * 1968-02-15 1969-10-03 Yawata Iron & Steel Co
FR2251790A1 (en) * 1973-11-15 1975-06-13 Leisenberg Manfred
GB1439456A (en) * 1972-06-05 1976-06-16 British Iron Steel Research Method of and apparatus for controlling a furnace

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Publication number Priority date Publication date Assignee Title
US3319887A (en) * 1964-02-28 1967-05-16 Bailey Meter Co Multi-zone furnace temperature and atmosphere control
US3447745A (en) * 1966-07-25 1969-06-03 Electric Furnace Co Furnace heating control
GB1258802A (en) * 1968-02-14 1971-12-30
DE1816373B1 (en) * 1968-12-21 1970-03-26 Matthias Ludwig Industrieofenb Furnace plant, in particular hood furnace plant
FR2195598B1 (en) * 1972-08-10 1976-05-21 Emballage Ste Gle Pour
FR2488423A1 (en) * 1980-08-06 1982-02-12 Saint Gobain Vitrage METHOD AND DEVICE FOR REGULATING THE TEMPERATURE OF A GLASS SHEET IN A MULTI-CELL OVEN

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
FR2001974A1 (en) * 1968-02-15 1969-10-03 Yawata Iron & Steel Co
GB1439456A (en) * 1972-06-05 1976-06-16 British Iron Steel Research Method of and apparatus for controlling a furnace
FR2251790A1 (en) * 1973-11-15 1975-06-13 Leisenberg Manfred

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794132A1 (en) * 1999-05-27 2000-12-01 Stein Heurtey Improved control of the temperature profile in a furnace for the reheating of steel products such as slabs and billets for subsequent rolling operations

Also Published As

Publication number Publication date
IT8422252A0 (en) 1984-08-07
GB8422586D0 (en) 1984-10-10
GB2146464B (en) 1987-01-21
DE3332989C2 (en) 1992-10-01
GB2146464A (en) 1985-04-17
FR2551849B1 (en) 1989-03-17
DE3332989A1 (en) 1985-03-28
IT1176575B (en) 1987-08-18

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