EP2167695B1 - Method for the heat treatment of a metal band - Google Patents

Method for the heat treatment of a metal band Download PDF

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Publication number
EP2167695B1
EP2167695B1 EP08756831.7A EP08756831A EP2167695B1 EP 2167695 B1 EP2167695 B1 EP 2167695B1 EP 08756831 A EP08756831 A EP 08756831A EP 2167695 B1 EP2167695 B1 EP 2167695B1
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EP
European Patent Office
Prior art keywords
muffle
furnace part
flue gas
fired furnace
flue gases
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.)
Not-in-force
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EP08756831.7A
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German (de)
French (fr)
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EP2167695A1 (en
Inventor
Peter Ebner
Dieter Ch. BRANDSTÄTTER
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Ebner Industrieofenbau GmbH
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Ebner Industrieofenbau GmbH
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Publication of EP2167695A1 publication Critical patent/EP2167695A1/en
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    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • 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
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • 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
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • 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
    • C21D9/562—Details
    • C21D9/565—Sealing arrangements
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work

Definitions

  • the invention relates to a method for heat treatment of a metal strip in front of a metallic coating, wherein the metal strip is first heated in a directly fired furnace part using hot flue gases and then annealed in a furnace section having at least one muffle under a reducing inert gas atmosphere.
  • annealing furnaces which have a directly fired furnace part for heating the steel strips in an oxidizing atmosphere and a subsequent furnace part, which is heated by means of jet pipes and contains a protective gas atmosphere.
  • the flue gases from the directly fired kiln part are also used to preheat the steel strips, the supply of heat from the flue gases, at least in some operating conditions, exceeds the heat requirement for heating the steel strips before entering the directly fired kiln part, thus leaving some of them they enter the directly fired furnace section, so that part of this heat energy must remain unused for the heat treatment of the steel strips.
  • the invention is therefore based on the object, a method for heat treatment of a metal strip in front of its metallic coating initially in an oxidizing flue gas atmosphere and then in a reducing inert gas atmosphere so that the available heat energy of the fuel used for the direct firing of the corresponding furnace part completely for the heat treatment the metal strip can be used.
  • the invention solves the task by the fact that the muffle is heated by means of the flue gases from the directly fired furnace part.
  • protective gas from the muffle can be admixed with the flue gases in the directly fired furnace part, which is sufficient to maintain a furnace atmosphere sufficient for substoichiometric combustion oxidizing effect on the strip surface but advantageously facilitates low oxygen concentration.
  • the afterburning of the flue gases can be carried out under superstoichiometric conditions while supplying additional combustion air in a flue gas chamber enclosing the muffle.
  • the method it is possible to start from an annealing furnace with a directly fired furnace part and with a subsequent furnace part, which has at least one muffle enclosed by a smoke gas chamber. It only needs the directly fired furnace part in the downstream side of the flue gases to be connected via at least one flue gas line to the muffle enclosing flue gas chamber to apply the muffle as needed with the still hot flue gases from the directly fired furnace part.
  • the muffle enclosing flue gas chamber can be used as a post-combustion chamber.
  • additional heat energy of To feed muffle preferably by means provided in the flue gas chamber burners whose flue gases then mix with those from the directly fired furnace part. About such burners but could also be blown for cooling only air in the flue gas chamber.
  • the annealing furnace shown has a furnace part 1 for preheating a metal strip 2 to be treated before its metallic coating in a melt or in an electrolytic bath, a directly fired furnace part 3 and a furnace part 4 with a muffle 5.
  • the arrangement is made such that the metal strip 2 passes through the furnace part 1 from bottom to top and is deflected by a roller box 6 to the directly fired furnace part 3, which is below via another roller box 7 with the muffle 5 in combination, so that the top emerging from the muffle 5 metal strip 2 can be withdrawn via a guide roller 8 through a channel 9.
  • For direct firing of the furnace part 3 10 are provided in this burner, with their hot Flue gases in this furnace part 3 downwardly running metal strip 2 is heated in countercurrent.
  • the directly fired furnace section 3 is connected on the downstream side of the flue gases through a flue gas duct 11 to a muffle 5 enclosing the flue gas chamber 12 through which the muffle 5 is heated, with the aid of the flue gases from the directly fired furnace part 3, as indicated by the dashed flow arrows is indicated. If the heat energy of this branched off into the flue gas chamber 12 flue gases is not sufficient for the respective necessary heating of the muffle 5, the muffle 5 additional heat energy can be supplied.
  • 12 burners 13 are provided in the flue gas chamber. With the help of these burners 13, a cooling could also be made when only air is blown into the flue gas chamber 12 via the burner nozzles.
  • the furnace part 1 for the preheating of the metal strip 2 is also heated with the aid of the flue gases from the directly fired furnace part 3.
  • a corresponding connecting line 14 is provided between the furnace parts 1 and 2.
  • the branched off to preheat the metal strip 2 from the flue gases of the directly fired furnace part 3 amount of flue gas is adjusted by a control valve 15 in the connecting line 14.
  • the pressure level in the furnace part 1 can be regulated by a throttle valve 16 in the flue gas outlet 17 of the furnace part 1.
  • the control flap in the flue gas duct 11 is designated by 18.
  • the throttle valve in the flue gas outlet 19 has the reference numeral 20.
  • the heat treatment of the metal strip 2 in the muffle 5 is carried out under a protective gas atmosphere.
  • the protective gas is passed in countercurrent to the metal strip 2 through the muffle 5 and passes over the lower roller box 7 in the directly fired furnace part 3, where the inert gas mixes with the flue gases.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Description

Technisches GebietTechnical area

Die Erfindung bezieht sich auf ein Verfahren zur Wärmebehandlung eines Metallbandes vor einer metallischen Beschichtung, wobei das Metallband zunächst in einem direkt befeuerten Ofenteil mit Hilfe heißer Rauchgase erwärmt und anschließend in einem wenigstens eine Muffel aufweisenden Ofenabschnitt unter einer reduzierenden Schutzgasatmosphäre geglüht wird.The invention relates to a method for heat treatment of a metal strip in front of a metallic coating, wherein the metal strip is first heated in a directly fired furnace part using hot flue gases and then annealed in a furnace section having at least one muffle under a reducing inert gas atmosphere.

Stand der TechnikState of the art

Zur Vorbehandlung von kaltgewalzten Stahlbändern für ein nachfolgendes Verzinken ist es bekannt, die Stahlbänder zunächst in einer oxidierenden Atmosphäre vorzuwärmen, um im Anschluss die Oxide, die der Benetzbarkeit und der Haftfähigkeit entgegenstehen, wieder in einer Schutzgasatmosphäre zu reduzieren. Zu diesem Zweck werden Glühöfen eingesetzt, die einen direkt befeuerten Ofenteil für die Erwärmung der Stahlbänder in einer oxidierenden Atmosphäre und einen daran anschließenden Ofenteil aufweisen, der mit Hilfe von Strahlrohren beheizt wird und eine Schutzgasatmosphäre enthält. Damit sich bei der Erwärmung der Stahlbänder mit den heißen Rauchgasen des direkt befeuerten Ofenteils eine nur geringe Oxidschicht auf der Bandoberfläche aufbauen kann, werden die eingesetzten Brennstoffe unterstöchiometrisch verbrannt, was Nachverbrennungskammern zur vollständigen Ausnützung der Brennstoffenergie bedingt. Obwohl die Rauchgase aus dem direkt befeuerten Ofenteil auch für die Vorwärmung der Stahlbänder eingesetzt werden, übersteigt das Wärmeangebot durch die Rauchgase zumindest in manchen Betriebszuständen den Wärmebedarf für die Erwärmung der Stahlbänder, bevor sie in den direkt befeuerten Ofenteil eintreten, sodass ein Teil dieser sie in den direkt befeuerten Ofenteil eintreten, sodass ein Teil dieser Wärmeenergie für die Wärmebehandlung der Stahlbänder ungenützt bleiben muss.For the pretreatment of cold-rolled steel strips for subsequent galvanizing, it is known to first preheat the steel strips in an oxidizing atmosphere, in order subsequently to reduce the oxides, which oppose wettability and adhesiveness, again in a protective gas atmosphere. For this purpose, annealing furnaces are used, which have a directly fired furnace part for heating the steel strips in an oxidizing atmosphere and a subsequent furnace part, which is heated by means of jet pipes and contains a protective gas atmosphere. Thus, when heating the steel strips with the hot flue gases of the directly fired furnace part can build up only a small oxide layer on the strip surface, the fuels used are burned substoichiometric, which post combustion chambers for complete utilization of the fuel energy conditions. Although the flue gases from the directly fired kiln part are also used to preheat the steel strips, the supply of heat from the flue gases, at least in some operating conditions, exceeds the heat requirement for heating the steel strips before entering the directly fired kiln part, thus leaving some of them they enter the directly fired furnace section, so that part of this heat energy must remain unused for the heat treatment of the steel strips.

Da mit Strahlrohren beheizte Glühöfen zur Wärmebehandlung eines Metallbandes nur einen begrenzten Wasserstoffgehalt in der reduzierenden Schutzgasatmosphäre aufweisen und dieser beschränkte Wasserstoffgehalt für das angestrebte Volumsverhältnis von Wasserstoff zu Wasserdampf zu Taupunkten führt, die mit solchen Glühöfen nicht erreicht werden können, wurde zur Wärmebehandlung von Metallbändern vor einer metallischen Beschichtung in einer Schmelze oder in einem elektrolytischen Bad bereits vorgeschlagen ( AT 500 686 B1 ), einen Ofenabschnitt mit mehreren nebeneinandergereihten Muffeln vorzusehen, in denen der Wasserstoffgehalt der Schutzgasatmosphäre entsprechend eingestellt werden kann. In einem dem Ofenabschnitt mit den Muffeln vorgeschalteten, direkt befeuerten Ofenabschnitt kann die Erwärmung des Metallbandes wieder in einer oxidierenden Atmosphäre der heißen Rauchgase durchgeführt werden, wobei sich hinsichtlich der Ausnützung der Wärmeenergie ähnlich nachteilige Verhältnisse ergeben.Since annealing furnaces heated with radiant tubes only have a limited hydrogen content in the reducing protective gas atmosphere for the heat treatment of a metal strip and this limited hydrogen content leads to the desired volume ratio of hydrogen to water vapor to dew points which can not be achieved with such annealing furnaces, heat treatment of metal strips was preferred metallic coating in a melt or in an electrolytic bath has already been proposed ( AT 500 686 B1 ), to provide a furnace section with a plurality of juxtaposed muffles, in which the hydrogen content of the inert gas atmosphere can be adjusted accordingly. In a directly fired furnace section upstream of the furnace section with the muffles, the heating of the metal strip can again be carried out in an oxidizing atmosphere of the hot flue gases, resulting in disadvantageous conditions with regard to the utilization of the heat energy.

Darstellungen der ErfindungIllustrations of the invention

Der Erfindung liegt somit die Aufgabe zugrunde, ein Verfahren zur Wärmebehandlung eines Metallbandes vor seiner metallischen Beschichtung zunächst in einer oxidierenden Rauchgasatmosphäre und anschließend in einer reduzierenden Schutzgasatmosphäre so auszugestalten, dass die verfügbare Wärmeenergie des eingesetzten Brennstoffes für die direkte Befeuerung des entsprechenden Ofenteils vollständig für die Wärmebehandlung des Metallbandes genützt werden kann.The invention is therefore based on the object, a method for heat treatment of a metal strip in front of its metallic coating initially in an oxidizing flue gas atmosphere and then in a reducing inert gas atmosphere so that the available heat energy of the fuel used for the direct firing of the corresponding furnace part completely for the heat treatment the metal strip can be used.

Ausgehend von einem Verfahren der eingangs geschilderten Art löst die Erfindung die gestellte Aufgabe dadurch, dass die Muffel mit Hilfe der Rauchgase aus dem direkt befeuerten Ofenteil erwärmt wird.Based on a method of the type described above, the invention solves the task by the fact that the muffle is heated by means of the flue gases from the directly fired furnace part.

Durch diese Maßnahme wird in einfacher Weise erreicht, dass die für die Erwärmung des Metallbandes im direkt befeuerten Ofenteil nicht nutzbare Wärmeenergie des eingesetzten Brennstoffes zur Erwärmung der Muffel genützt werden kann, der somit im Bedarfsfall lediglich zusätzliche Wärmeenergie zuzuführen ist. Da der Sauerstoffgehalt der Rauchgase im Bereich des Ofenteils mit der Muffel auf der Muffelaußenseite für die Behandlung des Metallbandes unter einer reduzierenden Schutzgasatmosphäre innerhalb der Muffel ohne Belang ist, kann auch die Nachverbrennung des Brennstoffes im Ofenteil mit der Muffel unter einer vorteilhaften Zufuhr von Verbrennungsluft ohne Gefahr für das Blankglühen des Metallbandes ablaufen.By this measure is achieved in a simple manner that the not usable for the heating of the metal strip in directly fired furnace part heat energy of the fuel used for heating the muffle can be used, which is therefore only supply additional heat energy when needed. Since the oxygen content of the flue gases in the region of the furnace part with the muffle on the muffle outside for the treatment of the metal strip under a reducing inert gas atmosphere within the muffle is irrelevant, the post-combustion of the fuel in the furnace part with the muffle under an advantageous supply of combustion air without danger for the bright annealing of the metal strip.

Um das Aufwachsen einer Oxidschicht auf der Bandoberfläche während der Erwärmung des Metallbandes im direkt befeuerten Ofenteil zu beschränken, kann Schutzgas aus der Muffel den Rauchgasen im direkt befeuerten Ofenteil zugemischt werden, was das Einhalten einer Ofenatmosphäre mit einer für eine unterstöchiometrische Verbrennung ausreichenden, zur Begrenzung der oxidierenden Wirkung auf die Bandoberfläche aber vorteilhaft niedrigen Sauerstoffkonzentration erleichtert. Die Nachverbrennung der Rauchgase kann unter überstöchiometrischen Bedingungen unter Zufuhr zusätzlicher Verbrennungsluft in einer die Muffel umschließenden Rauchgaskammer vorgenommen werden.In order to limit the growth of an oxide layer on the strip surface during the heating of the metal strip in the directly fired furnace part, protective gas from the muffle can be admixed with the flue gases in the directly fired furnace part, which is sufficient to maintain a furnace atmosphere sufficient for substoichiometric combustion oxidizing effect on the strip surface but advantageously facilitates low oxygen concentration. The afterburning of the flue gases can be carried out under superstoichiometric conditions while supplying additional combustion air in a flue gas chamber enclosing the muffle.

Zur Durchführung des Verfahrens kann von einem Glühofen mit einem direkt befeuerten Ofenteil und mit einem daran anschließenden Ofenteil ausgegangen werden, der wenigstens eine von einer Rauchgaskammer umschlossene Muffel aufweist. Es braucht ja lediglich der direkt befeuerte Ofenteil im Bereich der Abströmseite der Rauchgase über wenigstens eine Rauchgasleitung an die die Muffel umschließende Rauchgaskammer angeschlossen zu werden, um die Muffel je nach Bedarf mit den noch heißen Rauchgasen aus dem direkt befeuerten Ofenteil beaufschlagen zu können. Die die Muffel umschließende Rauchgaskammer kann dabei als Nachverbrennungskammer genützt werden. Außerdem ist es in herkömmlicher Weise möglich, zusätzliche Wärmeenergie der Muffel zuzuführen, vorzugsweise mit Hilfe von in der Rauchgaskammer vorgesehenen Brennern, deren Rauchgase sich dann mit denen aus dem direkt befeuerten Ofenteil mischen. Über solche Brenner könnte aber auch zur Kühlung nur Luft in die Rauchgaskammer eingeblasen werden.For carrying out the method, it is possible to start from an annealing furnace with a directly fired furnace part and with a subsequent furnace part, which has at least one muffle enclosed by a smoke gas chamber. It only needs the directly fired furnace part in the downstream side of the flue gases to be connected via at least one flue gas line to the muffle enclosing flue gas chamber to apply the muffle as needed with the still hot flue gases from the directly fired furnace part. The muffle enclosing flue gas chamber can be used as a post-combustion chamber. In addition, it is possible in a conventional manner, additional heat energy of To feed muffle, preferably by means provided in the flue gas chamber burners whose flue gases then mix with those from the directly fired furnace part. About such burners but could also be blown for cooling only air in the flue gas chamber.

Damit der direkt befeuerte Ofenteil mit Schutzgas aus der Muffel beschickt werden kann, ist für eine Strömungsverbindung zwischen der Muffel und dem direkt befeuerten Ofenteil im Bereich dessen der Rauchgasleitung gegenüberliegenden Stirnseite zu sorgen. Eine solche Strömungsverbindung bedarf keiner besonderen Konstruktionsmaßnahmen, weil ja die Bandführung zwischen den Ofenteilen eine entsprechende Verbindung der Ofenteile voraussetzt.In order for the directly fired furnace section to be supplied with protective gas from the muffle, provision is made for a flow connection between the muffle and the directly fired furnace section in the region of the end face opposite the flue gas line. Such a flow connection requires no special design measures, because yes, the tape guide between the oven parts requires a corresponding connection of the oven parts.

Kurze Beschreibung der ZeichnungShort description of the drawing

Anhand der Zeichnung wird das erfindungsgemäße Verfahren zur Wärmebehandlung eines Metallbandes vor seiner metallischen Beschichtung näher erläutert, und zwar wird ein erfindungsgemäßer Glühofen zur Durchführung des Verfahrens in einem schematischen Blockschaltbild gezeigt.The inventive method for heat treatment of a metal strip before its metallic coating is explained in more detail with reference to the drawing, namely an annealing furnace according to the invention for carrying out the method is shown in a schematic block diagram.

Wege zur Ausführung der ErfindungWays to carry out the invention

Der dargestellte Glühofen weist einen Ofenteil 1 zum Vorwärmen eines vor seiner metallischen Beschichtung in einer Schmelze oder in einem elektrolytischen Bad zu behandelnden Metallbandes 2, einen direkt befeuerten Ofenteil 3 und einen Ofenteil 4 mit einer Muffel 5 auf. Die Anordnung ist dabei so getroffen, dass das Metallband 2 den Ofenteil 1 von unten nach oben durchläuft und über einen Rollenkasten 6 zum direkt befeuerten Ofenteil 3 umgelenkt wird, der unten über einen weiteren Rollenkasten 7 mit der Muffel 5 in Verbindung steht, sodass das oben aus der Muffel 5 austretende Metallband 2 über eine Umlenkrolle 8 durch einen Kanal 9 abgezogen werden kann. Zur direkten Befeuerung des Ofenteils 3 sind in diesem Brenner 10 vorgesehen, mit deren heißen Rauchgasen das in diesem Ofenteil 3 abwärts laufende Metallband 2 im Gegenstrom erwärmt wird.The annealing furnace shown has a furnace part 1 for preheating a metal strip 2 to be treated before its metallic coating in a melt or in an electrolytic bath, a directly fired furnace part 3 and a furnace part 4 with a muffle 5. The arrangement is made such that the metal strip 2 passes through the furnace part 1 from bottom to top and is deflected by a roller box 6 to the directly fired furnace part 3, which is below via another roller box 7 with the muffle 5 in combination, so that the top emerging from the muffle 5 metal strip 2 can be withdrawn via a guide roller 8 through a channel 9. For direct firing of the furnace part 3 10 are provided in this burner, with their hot Flue gases in this furnace part 3 downwardly running metal strip 2 is heated in countercurrent.

Der direkt befeuerte Ofenabschnitt 3 ist auf der Abströmseite der Rauchgase durch eine Rauchgasleitung 11 an eine die Muffel 5 umschließenden Rauchgaskammer 12 angeschlossen, über die die Muffel 5 erwärmt wird, und zwar mit Hilfe der Rauchgase aus dem direkt befeuerten Ofenteil 3, wie dies durch die strichlierten Strömungspfeile angedeutet wird. Falls die Wärmeenergie dieser in die Rauchgaskammer 12 abgezweigten Rauchgase nicht für die jeweils notwendige Erwärmung der Muffel 5 ausreicht, kann der Muffel 5 zusätzliche Wärmeenergie zugeführt werden. Zu diesem Zweck sind in der Rauchgaskammer 12 Brenner 13 vorgesehen. Mit Hilfe diese Brenner 13 könnte auch eine Kühlung vorgenommen werden, wenn über die Brennerdüsen lediglich Luft in die Rauchgaskammer 12 geblasen wird.The directly fired furnace section 3 is connected on the downstream side of the flue gases through a flue gas duct 11 to a muffle 5 enclosing the flue gas chamber 12 through which the muffle 5 is heated, with the aid of the flue gases from the directly fired furnace part 3, as indicated by the dashed flow arrows is indicated. If the heat energy of this branched off into the flue gas chamber 12 flue gases is not sufficient for the respective necessary heating of the muffle 5, the muffle 5 additional heat energy can be supplied. For this purpose, 12 burners 13 are provided in the flue gas chamber. With the help of these burners 13, a cooling could also be made when only air is blown into the flue gas chamber 12 via the burner nozzles.

Der Ofenteil 1 für die Vorwärmung des Metallbandes 2 wird ebenfalls mit Hilfe der Rauchgase aus dem direkt befeuerten Ofenteil 3 erwärmt. Zu diesem Zweck ist zwischen den Ofenteilen 1 und 2 eine entsprechende Verbindungsleitung 14 vorgesehen. Die zur Vorwärmung des Metallbandes 2 aus den Rauchgasen des direkt befeuerten Ofenteils 3 abgezweigte Rauchgasmenge wird durch eine Steuerklappe 15 in der Verbindungsleitung 14 eingestellt. Das Druckniveau im Ofenteil 1 kann durch eine Drosselklappe 16 im Rauchgasabzug 17 des Ofenteils 1 geregelt werden. In ähnlicher Weise wird auf die durch die Rauchgaskammer 12 des Ofenteils 4 strömende Rauchgasmenge und das Druckniveau in dieser Rauchgaskammer 12 Einfluss genommen. Die Steuerklappe in der Rauchgasleitung 11 ist mit 18 bezeichnet. Die Drosselklappe im Rauchgasabzug 19 weist das Bezugszeichen 20 auf.The furnace part 1 for the preheating of the metal strip 2 is also heated with the aid of the flue gases from the directly fired furnace part 3. For this purpose, a corresponding connecting line 14 is provided between the furnace parts 1 and 2. The branched off to preheat the metal strip 2 from the flue gases of the directly fired furnace part 3 amount of flue gas is adjusted by a control valve 15 in the connecting line 14. The pressure level in the furnace part 1 can be regulated by a throttle valve 16 in the flue gas outlet 17 of the furnace part 1. Similarly, the amount of flue gas flowing through the flue gas chamber 12 of the furnace part 4 and the pressure level in this flue gas chamber 12 are influenced. The control flap in the flue gas duct 11 is designated by 18. The throttle valve in the flue gas outlet 19 has the reference numeral 20.

Die Wärmebehandlung des Metallbandes 2 in der Muffel 5 wird unter einer Schutzgasatmosphäre durchgeführt. Das Schutzgas wird im Gegenstrom zum Metallband 2 durch die Muffel 5 geführt und gelangt über den unteren Rollenkasten 7 in den direkt befeuerten Ofenteil 3, wo sich das Schutzgas mit den Rauchgasen mischt.The heat treatment of the metal strip 2 in the muffle 5 is carried out under a protective gas atmosphere. The protective gas is passed in countercurrent to the metal strip 2 through the muffle 5 and passes over the lower roller box 7 in the directly fired furnace part 3, where the inert gas mixes with the flue gases.

Durch die beschriebene Rauchgasführung wird im Ofenteil 3 eine direkte Erwärmung des Metallbandes 2 durch die Rauchgase erreicht, die zur Vermeidung einer für die Ausbildung einer beschränkten Oxidschicht auf der Bandoberfläche in einem unterstöchiometrischen Bereich verbrannt werden, wobei durch das Zumischen von Schutzgas aus der Muffel 5 die Sauerstoffkonzentration weiter gesenkt werden kann. Trotz einer solchen unterstöchiometrischen Verbrennung der eingesetzten Brennstoffe kann die Wärmeenergie dieser Brennstoffe gut genützt werden, weil die Rauchgaskammer 12 einerseits und der Ofenteil 1 zur Vorwärmung des Metallbandes 2 anderseits vorteilhafte Nachverbrennungsstrecken darstellen.By the described flue gas guide a direct heating of the metal strip 2 is achieved by the flue gases in the furnace part 3, which are burned to avoid formation of a limited oxide layer on the strip surface in a substoichiometric range, wherein the mixing of inert gas from the muffle 5 the Oxygen concentration can be further reduced. Despite such a stoichiometric combustion of the fuels used, the heat energy of these fuels can be used well, because the flue gas chamber 12 on the one hand and the furnace part 1 for preheating the metal strip 2 on the other hand represent advantageous Nachverbrennungsstrecken.

Claims (6)

  1. Method for the heat treatment of a metal strip (2) prior to metallic coating, wherein the metal strip (2) is initially heated in a direct fired furnace part (3) using hot flue gases and then annealed in a reducing protective atmosphere in a furnace section (4) comprising at least one muffle (5), characterised in that the muffle (5) is heated using the flue gases from the direct fired furnace part (3).
  2. Method as claimed in claim 1, characterised in that the flue gases obtained in the direct fired furnace part (3) by substoichiometric combustion are subjected to hyperstoichiometric post-combustion in a flue gas chamber (12) surrounding the muffle (5) by supplying additional combustion air.
  3. Method as claimed in claim 1 or 2, characterised in that protective gas from the muffle (5) is mixed with the flue gases in the direct fired furnace part (3).
  4. Annealing furnace for performing the method as claimed in any one of claims 1 to 3, having a direct fired furnace part and a furnace part connected thereto which comprises at least one muffle surrounded by a flue gas chamber, characterised in that the direct fired furnace part (3) is connected to the flue gas chamber (12) surrounding the muffle (5) in the region of the outflow side of the flue gases via at least one flue gas line (11).
  5. Annealing furnace as claimed in claim 4, characterised in that the muffle (5) is in flow communication with the direct fired furnace part (3) in the region of its end face lying opposite the flue gas line (11).
  6. Annealing furnace as claimed in claim 4 or 5, characterised in that the flue gas chamber (12) comprises burners (13) for additionally heating the muffle (5).
EP08756831.7A 2007-07-18 2008-06-19 Method for the heat treatment of a metal band Not-in-force EP2167695B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0113507A AT505289B1 (en) 2007-07-18 2007-07-18 METHOD FOR HEAT TREATMENT OF A METAL STRIP
PCT/AT2008/000221 WO2009009809A1 (en) 2007-07-18 2008-06-19 Method for the heat treatment of a metal band

Publications (2)

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EP2167695A1 EP2167695A1 (en) 2010-03-31
EP2167695B1 true EP2167695B1 (en) 2017-05-31

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AT (1) AT505289B1 (en)
TW (1) TW200914625A (en)
WO (1) WO2009009809A1 (en)

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US11104975B2 (en) 2017-07-13 2021-08-31 Andritz Technology And Asset Management Gmbh Method for reducing nitrogen oxides in strip treatment furnaces

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DE102012007292A1 (en) * 2012-04-12 2013-10-17 Linde Aktiengesellschaft Method and treatment section for partially refining a metal product
CN107639114A (en) * 2017-09-23 2018-01-30 芜湖恒泰有色线材股份有限公司 A kind of continuous finish draw equipment of fine welding wire for preventing fracture of wire

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US3720546A (en) * 1969-04-21 1973-03-13 Nippon Steel Corp Method for preventing destruction of strip metal in annealing furnace connected with direct heating furnace
US4183983A (en) * 1978-08-17 1980-01-15 Selas Corporation Of America Method for reducing metal oxide formation on a continuous metal sheet in the hot dip coating thereof
AU538925B2 (en) * 1979-04-16 1984-09-06 Ak Steel Corporation Finishing of hop dip coating of ferrous base metal
US5023113A (en) * 1988-08-29 1991-06-11 Armco Steel Company, L.P. Hot dip aluminum coated chromium alloy steel
FR2720079B1 (en) * 1994-05-19 1996-06-21 Lorraine Laminage Process for coating aluminum by hot quenching a part, in particular a strip, of steel containing at least 0.1% by weight of manganese, in particular of stainless and / or alloyed steel.
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AT500686B1 (en) * 2004-06-28 2007-03-15 Ebner Ind Ofenbau METHOD FOR THE HEAT TREATMENT OF A METAL STRIP BEFORE A METALLIC COATING
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Publication number Priority date Publication date Assignee Title
US11104975B2 (en) 2017-07-13 2021-08-31 Andritz Technology And Asset Management Gmbh Method for reducing nitrogen oxides in strip treatment furnaces

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AT505289A4 (en) 2008-12-15
TW200914625A (en) 2009-04-01
AT505289B1 (en) 2008-12-15
EP2167695A1 (en) 2010-03-31
WO2009009809A1 (en) 2009-01-22

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