EP2486157B1 - Method and hood-type annealing furnace for annealing metal bands at high temperatures - Google Patents

Method and hood-type annealing furnace for annealing metal bands at high temperatures Download PDF

Info

Publication number
EP2486157B1
EP2486157B1 EP10784250.2A EP10784250A EP2486157B1 EP 2486157 B1 EP2486157 B1 EP 2486157B1 EP 10784250 A EP10784250 A EP 10784250A EP 2486157 B1 EP2486157 B1 EP 2486157B1
Authority
EP
European Patent Office
Prior art keywords
hood
annealing
chamber
heating
heating chamber
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.)
Active
Application number
EP10784250.2A
Other languages
German (de)
French (fr)
Other versions
EP2486157A1 (en
EP2486157B9 (en
Inventor
Frank Maschler
Michal Buryan
Horst Wachholder
Peter Wendt
Hardy Maass
Achim Beutel
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.)
LOI Thermprocess GmbH
Original Assignee
LOI Thermprocess GmbH
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 LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Priority to PL10784250T priority Critical patent/PL2486157T3/en
Publication of EP2486157A1 publication Critical patent/EP2486157A1/en
Publication of EP2486157B1 publication Critical patent/EP2486157B1/en
Application granted granted Critical
Publication of EP2486157B9 publication Critical patent/EP2486157B9/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F27B11/00—Bell-type 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
    • C21D9/663—Bell-type 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
    • C21D9/663—Bell-type furnaces
    • C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
    • 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
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners

Definitions

  • the invention relates to a method for high-temperature annealing of metal strip, sheet metal or wire, in particular of grain-oriented electrical steel in the form of coils in a space under a protective gas or in a Schutzgasatmos Georgre in a hood furnace with a stove with at least one parking space for a batch in the form of a coil or a coil stack, with at least one protective cover which covers the charge and under which the incandescent space is formed, with a dynamic seal between the hood and stove and with a protective hood at a distance surrounded heating hood, under which a boiler room is formed. Furthermore, the invention relates to a corresponding bell annealing furnace.
  • the process for high temperature annealing or coarse grain annealing of grain oriented electrical steel is an annealing process at very high temperatures, such as between 1100 ° C and 1200 ° C.
  • Grain-oriented electrical steel is used for the iron core or wound cores of transformers or generators. It is silicon-alloyed steel sheet, which has good magnetic properties. The electrical steel is wound into batches or coils or stacked.
  • a bell annealing furnace typically includes a hearth having at least one parking space for a batch in the form of a coil or a coil stack, a protective cover covering the charge, a heating hood and a cooling hood that is used as an alternative to the heating hood. Under the guard, a glow space is formed.
  • the heating hood defines a heating space, which is designed essentially as an annular space between the protective hood and the heating hood.
  • Such ovens are for example from the WO-A 2006/111246 .
  • the annealing space is purged with nitrogen (N 2 ) to remove the atmospheric oxygen. It is then heated to a temperature of 600 to 850 ° C and possibly held for several hours. During this time, it is purged with nitrogen.
  • N 2 nitrogen
  • purging inert gas is introduced into the annealing space continuously or at predetermined intervals, while the inert gas atmosphere flows with a defined volume flow.
  • the annealing space is rinsed with a mixture of nitrogen (N 2 ) and hydrogen (H 2 ).
  • the annealing space or the electrical steel is slowly heated further.
  • the purge is switched to pure hydrogen (H 2 ).
  • it is heated with a controllable gradient, ie the temperature is lowered to 650 ° C and below.
  • the hydrogen (H 2 ) in the annealing space under the protective cover is flushed out with nitrogen (N 2 ). Afterwards the heating hood can be removed.
  • the protective hood is sealed off from the hearth by means of a dynamic seal, in particular one or more sand cups.
  • a dynamic seal in particular one or more sand cups.
  • protective gas can escape through the sand cup seal between the guard and stove in the boiler room.
  • the boiler room bounded on the outside by the heating hood, is sealed against the environment by a water cup.
  • the removal of the protective gas from the boiler room is done by an exhaust pipe, which usually contains a pressure control element.
  • the discharged shielding gas is then burned outside the heating hood in a torch.
  • Dome annealing furnaces where the protective hood is sealed off from the stove with a dynamic seal, usually with a sand cup, have hitherto only been electrically heated.
  • the electric heating causes comparatively high heating costs.
  • the invention has for its object to overcome the disadvantages of the prior art.
  • the heating chamber is heated by burners, the flames of which are openly directed into the heating space, wherein the overpressure chamber maintains an overpressure with respect to the heating space, which is at least 10 Pa and at most 200 Pa, and wherein the overpressure between the heating space and the heating space during the annealing process is continuously monitored and at a decrease in the pressure in response to the falling below a limit value an emergency rinse for flushing the annealing space is initiated under the guard and the boiler room under the heating hood.
  • the overpressure between the annealing chamber and the heating chamber is monitored continuously during the annealing process and an emergency purge is initiated when the overpressure drops as a function of falling below a limit value.
  • an emergency purge is initiated when the overpressure drops as a function of falling below a limit value.
  • the purge rate in the annealing space can be increased.
  • the gas flow is increased, which is introduced continuously or at predetermined intervals during the annealing process in the annealing space.
  • the emergency purging can be initiated during the entire annealing process to remove hydrogen-containing inert gas atmosphere from the annealing chamber and the boiler room.
  • combustion air is supplied to the burners for combustion of the hydrogen, which can escape from the annealing space through the dynamic seal in the boiler room. Since the flames of the burners are openly directed into the boiler room, the hydrogen can be easily rendered harmless.
  • the combustion air required for the combustion of the hydrogen can be supplied to the burners by means of a combustion air line, which opens into the boiler room. Alternatively, the combustion air flow to the burners can be increased.
  • the annealing space and the heating space are preferably purged with one inert gas volume flow in each case, the ratio of the inert gas volume flow with which the heating space is flushed under the heating hood to the inert gas volume flow with which the annealing space is purged becoming greater than 25.
  • the flames of the burner are directed into the boiler room in such a way that an equidirectional annular flow of the exhaust gases is generated in the boiler room over its entire height. This achieves a uniform temperature distribution.
  • a crucible annealing furnace for high-temperature annealing of metal strip, sheet or wire, in particular of grain-oriented electrical steel in the form of coils in a space under a protective gas or in a protective gas atmosphere in a hood furnace, according to one of claims 1 to 4, with a stove with at least one parking space for a batch in the form of a coil or a coil stack, with at least one protective cover that covers the batch and under which the incandescent space is formed, with a dynamic seal between the protective hood and stove and with the protective hood at a distance surrounded heating hood under which a boiler room is formed, characterized in that the heating hood has a plurality of operated with liquid or gaseous fuel burners whose flames are open in the boiler room and that the annealing furnace an emergency flushing device for purging the annealing space under the protective hood and the boiler room below r has the heating hood with inert gas, wherein each open an inert gas supply in the
  • an overpressure is maintained against the boiler room, which is at least 10 Pa and at most 200 Pa.
  • the emergency flushing device ensures that a fuel-fired bonnet furnace, whose combustion chamber is not gas-tight against the stove, can be safely operated.
  • a development is characterized by at least one group of vertically stacked burners.
  • a group of vertically stacked burners which are directed towards one another in the flow direction of the exhaust gases, is located at the end faces of the heating hood, in such a way that a co-current exhaust gas flow is created in the heating chamber. It is generated in the same way annular flow of exhaust gases in the boiler room over its entire height. Due to the annular flow of the exhaust gases and the good circulation of the exhaust gases of the vertically stacked burner a good temperature uniformity over the entire height of the bell annealing furnace is achieved.
  • the burners are designed as high-speed burners.
  • Fig. 1 and Fig. 2 show schematically a heating hood 1 of a bell annealing furnace.
  • the heating hood 1 is heated by means of two groups of burners 2 in the form of high-speed burners, preferably recuperative burners.
  • the burners 2 of each group are arranged one above the other at the end faces of the heating hood 1 and burn with open flames in a substantially annular heating chamber 3.
  • the arrangement of the burner groups takes place against each other to a good sense of exhaust gas flow a good circulation of the flue gases and thus to achieve a good temperature uniformity.
  • the burners 2 additional combustion air for combustion of the escape from the annealing chamber 5 through the dynamic seal in the heating chamber 3 escaping hydrogen. Since the flames of the burner 2 are directed open in the boiler room 3, the hydrogen can be made harmless in a simple manner.
  • the annealing spaces 5 can be flushed with hydrogen.
  • the sand cups are not gas-tight. Hydrogen, which passes through the sand cup seal in the heating chamber 3, is burned by means of excess air to the burners 2, which is dosed appropriately.
  • each annealing chamber 5 each open an inert gas supply 6 an emergency flushing device for simultaneous flushing of the heating chamber 3 and the annealing chamber 5 with inert gas, in this case nitrogen.
  • inert gas in this case nitrogen.
  • the heating chamber 3 are flushed with a large inert gas volume flow and at the same time in each case the Glühschreib 5 with a low gas flow rate.
  • Fig. 3 the emergency flushing process according to the invention is shown.
  • the diagram shows the inert gas volume flow (ordinate, in m 3 / h) and the hydrogen and oxygen concentration in% as a function of time (abscissa, in min).
  • the lower explosive limit of hydrogen is set at 2%.
  • the boiler room 3 is filled with air under the heating hood 1, in the heating chamber 5 under the protective hoods 4 is pure hydrogen.
  • Each of the three Glühsammlung 5 under the protective hoods 4 is purged with 2 m 3 / h of nitrogen, the boiler room 3 under the heating hood 1 with 240 m 3 / h.
  • the process temperature should be 400 ° C, the gases expand accordingly and thus speed up the flushing process.
  • the maximum hydrogen concentration in the heating hood is less than 2% and is reached after approx. 10 min. At this time, the oxygen content is also about 2%.
  • the rinsing of the glaze chambers under the protective hoods 4 is continued until the hydrogen is also rinsed below the protective hoods 4 to less than 2%, which in the present Example after approx. 360 min is reached. This heating mantle 1 and 4 protective covers are in safe condition and the emergency flushing is terminated.
  • the combustion air can be preheated by means of a central recuperator.
  • the burners 2 the combustion air required for the combustion of the combustion air can be supplied by means of a combustion air duct, which opens into the heating chamber 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Hochtemperatur-Glühen von Metallband, Blech oder Draht, insbesondere von kornorientiertem Elektroband in Form von Coils in einem Glühraum unter Schutzgas bzw. in einer Schutzgasatmospäre in einem Haubenofen mit einen Herd mit mindestens einem Stellplatz für eine Charge in Form von einem Coil oder einem Coil-Stapel, mit mindestens einer Schutzhaube, die die Charge abdeckt und unter der der Glühraum ausgebildet wird, mit einer dynamischen Dichtung zwischen Schutzhaube und Herd sowie mit einer die Schutzhaube mit Abstand umgebene Heizhaube, unter der ein Heizraum gebildet wird. Ferner betrifft die Erfindung einen entsprechenden Haubenglühofen.The invention relates to a method for high-temperature annealing of metal strip, sheet metal or wire, in particular of grain-oriented electrical steel in the form of coils in a space under a protective gas or in a Schutzgasatmospäre in a hood furnace with a stove with at least one parking space for a batch in the form of a coil or a coil stack, with at least one protective cover which covers the charge and under which the incandescent space is formed, with a dynamic seal between the hood and stove and with a protective hood at a distance surrounded heating hood, under which a boiler room is formed. Furthermore, the invention relates to a corresponding bell annealing furnace.

Bei dem Verfahren zum Hochtemperatur-Glühen oder Grobkorn-Glühen von kornorientiertem Elektroband handelt sich um ein Glühverfahren bei sehr hohen Temperaturen etwa zwischen 1100 °C und 1200 °C.The process for high temperature annealing or coarse grain annealing of grain oriented electrical steel is an annealing process at very high temperatures, such as between 1100 ° C and 1200 ° C.

Kornorientiertes Elektroband wird für den Eisenkern bzw. gewickelte Kerne von Transformatoren oder Generatoren verwendet. Es handelt sich um Silizium-legiertes Stahlblech, das gute magnetische Eigenschaften besitzt. Das Elektroband wird zu Chargen bzw. Coils gewickelt oder gestapelt.Grain-oriented electrical steel is used for the iron core or wound cores of transformers or generators. It is silicon-alloyed steel sheet, which has good magnetic properties. The electrical steel is wound into batches or coils or stacked.

Es ist bekannt, zum chargenweisen Hochtemperatur-Glühen von Elektroband Haubenglühöfen einzusetzen.It is known to use batch-wise high-temperature annealing of electrical steel strip annealing furnaces.

Ein Haubenglühofen weist in der Regel einem Herd mit mindestens einem Stellplatz für eine Charge in Form eines Coils oder einen Coil-Stapels, eine Schutzhaube, die die Charge abdeckt, eine Heizhaube und eine Kühlhaube auf, die alternativ zu der Heizhaube eingesetzt wird. Unter der Schutzhaube wird ein Glühraum ausgebildet. Die Heizhaube begrenzt einen Heizraum, der im Wesentlichen als Ringraum zwischen der Schutzhaube und der Heizhaube ausgebildet ist. Solche Öfen sind beispielsweise aus der WO-A 2006/111246 , DD-A 261 380 oder der DE-C 37 20 251 bekannt.A bell annealing furnace typically includes a hearth having at least one parking space for a batch in the form of a coil or a coil stack, a protective cover covering the charge, a heating hood and a cooling hood that is used as an alternative to the heating hood. Under the guard, a glow space is formed. The heating hood defines a heating space, which is designed essentially as an annular space between the protective hood and the heating hood. Such ovens are for example from the WO-A 2006/111246 . DD-A 261 380 or the DE-C 37 20 251 known.

Beim Hochtemperatur-Glühverfahren von kornorientiertem Elektroband wird zunächst der Glühraum mit Stickstoff (N2) gespült, um den Luftsauerstoff zu entfernen. Danach wird auf eine Temperatur von 600 bis 850 °C aufgeheizt und ggf. einige Stunden gehalten. In dieser Zeit wird mit Stickstoff gespült. Beim Spülen wird kontinuierlich oder in vorgegebenen Intervallen Schutzgas in den Glühraum eingeleitet, während die Schutzgasatmosphäre mit einem definierten Volumenstrom abströmt.In the high-temperature annealing process of grain-oriented electrical steel, first the annealing space is purged with nitrogen (N 2 ) to remove the atmospheric oxygen. It is then heated to a temperature of 600 to 850 ° C and possibly held for several hours. During this time, it is purged with nitrogen. When purging inert gas is introduced into the annealing space continuously or at predetermined intervals, while the inert gas atmosphere flows with a defined volume flow.

Danach wird der Glühraum mit einem Gemisch aus Stickstoff (N2) und Wasserstoff (H2) gespült. Der Glühraum bzw. das Elektroband wird langsam weiter aufgeheizt. Nach Beendigung der Kristall-Ausrichtung im Elektroband wird die Spülung auf reinen Wasserstoff (H2) umgestellt. Danach wird mit regelbarem Gradienten abgeheizt, d. h. die Temperatur bis auf 650 °C und darunter gesenkt. Anschließend wird der im Glühraum unter der Schutzhaube befindliche Wasserstoff (H2) mit Stickstoff (N2) ausgespült. Danach kann die Heizhaube entfernt werden.Thereafter, the annealing space is rinsed with a mixture of nitrogen (N 2 ) and hydrogen (H 2 ). The annealing space or the electrical steel is slowly heated further. After completion of the crystal orientation in the electrical steel, the purge is switched to pure hydrogen (H 2 ). Then it is heated with a controllable gradient, ie the temperature is lowered to 650 ° C and below. Subsequently, the hydrogen (H 2 ) in the annealing space under the protective cover is flushed out with nitrogen (N 2 ). Afterwards the heating hood can be removed.

Die Schutzhaube ist gegenüber dem Herd mittels einer dynamischer Dichtung, insbesondere einer oder mehrerer Sandtassen abgedichtet. Obwohl eine derartige Dichtung nicht gasdicht ist, wird diese aufgrund der hohen Glühtemperaturen in der Praxis verwendet. Wegen der hohen Glühtemperaturen ist eine gasdichte Abdichtung konstruktiv sehr aufwendig und wird daher nicht eingesetzt.The protective hood is sealed off from the hearth by means of a dynamic seal, in particular one or more sand cups. Although such a gasket is not gas-tight, it is used in practice because of the high annealing temperatures. Because of the high annealing temperatures, a gas-tight seal is structurally very expensive and is therefore not used.

Daher kann Schutzgas durch die Sandtassen-Abdichtung zwischen Schutzhaube und Herd in den Heizraum entweichen. Der Heizraum, außen begrenzt durch die Heizhaube, ist gegen die Umgebung durch eine Wassertasse gasdicht abgeschlossen. Die Abführung des Schutzgases aus dem Heizraum geschieht durch eine Abgas-Rohrleitung, die in der Regel ein Druckregelorgan enthält. Das abgeführte Schutzgas wird dann außerhalb der Heizhaube in einer Fackel verbrannt.Therefore, protective gas can escape through the sand cup seal between the guard and stove in the boiler room. The boiler room, bounded on the outside by the heating hood, is sealed against the environment by a water cup. The removal of the protective gas from the boiler room is done by an exhaust pipe, which usually contains a pressure control element. The discharged shielding gas is then burned outside the heating hood in a torch.

Haubenglühöfen, bei denen die Schutzhaube gegenüber dem Herd mit einer dynamischen Dichtung, meistens mit einer Sandtasse, abgedichtet ist, wurden bisher ausschließlich elektrisch beheizt. Die elektrische Beheizung verursacht vergleichsweise hohe Heizkosten.Dome annealing furnaces, where the protective hood is sealed off from the stove with a dynamic seal, usually with a sand cup, have hitherto only been electrically heated. The electric heating causes comparatively high heating costs.

Gegen eine Beheizung des Heizraumes mit Brennern spricht, dass sauerstoffhaltige Atmosphäre aus dem Heizraum unter Umständen in den wasserstoffgefüllten Glühraum unter der Schutzhaube gelangen kann, was ein Sicherheitsproblem darstellt und darüber hinaus die Charge beeinträchtigt.Against a heating of the boiler room with burners speaks that oxygen-containing atmosphere from the boiler room can possibly get into the hydrogen-filled space under the protective hood, which is a security problem and also affects the batch.

Der Erfindung liegt die Aufgabe zugrunde, die Nachteile des Standes der Technik zu überwinden.The invention has for its object to overcome the disadvantages of the prior art.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruches 1 gelöst. Erfindungsgemäß wird der Heizraum mit Brennern beheizt, deren Flammen offen in den Heizraum gerichtet sind, wobei im Glühraum ein Überdruck gegenüber dem Heizraum gehalten, der mindestens 10 Pa und höchstens 200 Pa beträgt und wobei der Überdruck zwischen dem Glühraum und Heizraum während des Glühverfahrens kontinuierlich überwacht wird und bei einem Absinken des Überdrucks in Abhängigkeit von dem Unterschreiten eines Grenzwertes eine Notspülung zum Spülen des Glühraumes unter der Schutzhaube und des Heizraumes unter der Heizhaube eingeleitet wird.This object is achieved by a method having the features of claim 1. According to the invention, the heating chamber is heated by burners, the flames of which are openly directed into the heating space, wherein the overpressure chamber maintains an overpressure with respect to the heating space, which is at least 10 Pa and at most 200 Pa, and wherein the overpressure between the heating space and the heating space during the annealing process is continuously monitored and at a decrease in the pressure in response to the falling below a limit value an emergency rinse for flushing the annealing space is initiated under the guard and the boiler room under the heating hood.

Aufgrund der Beheizung mittels Brennstoff verringern sich die Energiekosten gegenüber einer elektrischen Beheizung. Versuche haben überraschenderweise gezeigt, dass geringe Überdrücke in der vorgenannten Größenordnung ausreichen, um Sicherheitsbedenken in Bezug auf die Beheizung des Heizraumes mit Brennern auszuräumen.Due to the heating by means of fuel, the energy costs are reduced compared to an electric heating. Experiments have surprisingly shown that low excess pressures in the aforementioned order are sufficient to eliminate safety concerns with respect to the heating of the boiler room with burners.

Der Überdruck zwischen dem Glühraum und dem Heizraum wird während des Glühverfahrens kontinuierlich überwacht und bei einem Absinken des Überdrucks in Abhängigkeit von dem Unterschreiten eines Grenzwertes eine Notspülung eingeleitet. Somit wird die Qualität der dynamischen Dichtung bzw. der Sandtassen-Dichtung während des Glühverfahrens kontinuierlich überwacht.The overpressure between the annealing chamber and the heating chamber is monitored continuously during the annealing process and an emergency purge is initiated when the overpressure drops as a function of falling below a limit value. Thus, the quality of the dynamic seal or sand cup seal is continuously monitored during the annealing process.

Solange der Grenzwert nicht unterschritten wird, kann die Spülrate im Glühraum erhöht werden. Dazu wird vorzugsweise der Gasstrom vergrößert, welcher kontinuierlich oder in vorgegebenen Intervallen während des Glühverfahrens in den Glühraum eingeleitet wird.As long as the limit value is not undershot, the purge rate in the annealing space can be increased. For this purpose, preferably the gas flow is increased, which is introduced continuously or at predetermined intervals during the annealing process in the annealing space.

Die Notspülung kann während des gesamten Glühverfahrens eingeleitet werden, um wasserstoffhaltige Schutzgasatmosphäre aus dem Glühraum und dem Heizraum zu entfernen.The emergency purging can be initiated during the entire annealing process to remove hydrogen-containing inert gas atmosphere from the annealing chamber and the boiler room.

Vorzugsweise wird den Brennern zusätzliche Verbrennungsluft zur Verbrennung des Wasserstoffs zugeführt, der vom Glühraum durch die dynamische Dichtung in den Heizraum entweichen kann. Da die Flammen der Brenner offen in den Heizraum gerichtet sind, kann der Wasserstoff auf einfache Weise unschädlich gemacht werden. Die für die Verbrennung des Wasserstoffs benötigte Verbrennungsluft kann den Brennern mittels einer Verbrennungsluftleitung zugeführt werden, die in dem Heizraum mündet. Alternativ kann der Verbrennungsluftstrom zu den Brennern vergrößert werden.Preferably, additional combustion air is supplied to the burners for combustion of the hydrogen, which can escape from the annealing space through the dynamic seal in the boiler room. Since the flames of the burners are openly directed into the boiler room, the hydrogen can be easily rendered harmless. The combustion air required for the combustion of the hydrogen can be supplied to the burners by means of a combustion air line, which opens into the boiler room. Alternatively, the combustion air flow to the burners can be increased.

Vorzugsweise wird während der Notspülung der Glühraum und der Heizraum mit je einem Inertgas-Volumenstrom gespült, wobei das Verhältnis des Inertgas-Volumenstromes, mit dem der Heizraum unter der Heizhaube gespült wird, zu dem Inertgas-Volumenstrom, mit dem der Glühraum gespült wird, größer als 25 ist. Vorteilhafterweise sind die Flammen der Brenner derart in den Heizraum gerichtet, dass eine gleichsinnige ringförmige Strömung der Abgase im Heizraum über dessen gesamte Höhe erzeugt wird. Damit wird eine gleichmäßige Temperaturverteilung erreicht.During the emergency purging, the annealing space and the heating space are preferably purged with one inert gas volume flow in each case, the ratio of the inert gas volume flow with which the heating space is flushed under the heating hood to the inert gas volume flow with which the annealing space is purged becoming greater than 25. Advantageously, the flames of the burner are directed into the boiler room in such a way that an equidirectional annular flow of the exhaust gases is generated in the boiler room over its entire height. This achieves a uniform temperature distribution.

Die Aufgabe wird ferner gelöst durch einen Haubenglühofen zum Hochtemperatur-Glühen von Metallband, Blech oder Draht, insbesondere von kornorientiertem Elektroband in Form von Coils in einem Glühraum unter Schutzgas bzw. in einer Schutzgasatmospäre in einem Haubenofen, nach einem der Ansprüche 1 bis 4, mit einem Herd mit mindestens einem Stellplatz für eine Charge in Form von einem Coil oder einem Coil-Stapel, mit mindestens einer Schutzhaube, die die Charge abdeckt und unter der der Glühraum ausgebildet wird, mit einer dynamischen Dichtung zwischen Schutzhaube und Herd sowie mit einer die Schutzhaube mit Abstand umgebene Heizhaube unter der ein Heizraum gebildet wird, dadurch gekennzeichnet, dass die Heizhaube eine Mehrzahl von mit flüssigem oder gasförmigem Brennstoff betriebenen Brennern aufweist, deren Flammen offen in den Heizraum gerichtet sind und dass der Haubenglühofen eine Notspüleinrichtung zum Spülen des Glühraumes unter der Schutzhaube und des Heizraumes unter der Heizhaube mit Inertgas aufweist, wobei im Glühraum und im Heizraum je eine Inertgas-Zuführung münden.The object is further achieved by a crucible annealing furnace for high-temperature annealing of metal strip, sheet or wire, in particular of grain-oriented electrical steel in the form of coils in a space under a protective gas or in a protective gas atmosphere in a hood furnace, according to one of claims 1 to 4, with a stove with at least one parking space for a batch in the form of a coil or a coil stack, with at least one protective cover that covers the batch and under which the incandescent space is formed, with a dynamic seal between the protective hood and stove and with the protective hood at a distance surrounded heating hood under which a boiler room is formed, characterized in that the heating hood has a plurality of operated with liquid or gaseous fuel burners whose flames are open in the boiler room and that the annealing furnace an emergency flushing device for purging the annealing space under the protective hood and the boiler room below r has the heating hood with inert gas, wherein each open an inert gas supply in the annealing chamber and in the boiler room.

Im Glühraum wird ein Überdruck gegenüber dem Heizraum aufrechterhalten wird, der mindestens 10 Pa und höchstens 200 Pa beträgt.In the annealing chamber, an overpressure is maintained against the boiler room, which is at least 10 Pa and at most 200 Pa.

Mit der Notspüleinrichtung wird gewährleistet, dass ein brennstoffbeheizter Haubenglühofen, dessen Glühraum nicht gasdicht gegenüber dem Herd abgedichtet ist, sicher betrieben werden kann.The emergency flushing device ensures that a fuel-fired bonnet furnace, whose combustion chamber is not gas-tight against the stove, can be safely operated.

Eine Weiterbildung ist gekennzeichnet durch mindestens eine Gruppe von vertikal übereinander angeordneten Brennern.A development is characterized by at least one group of vertically stacked burners.

Vorzugsweise befindet sich an den Stirnseiten der Heizhaube jeweils eine Gruppe von vertikal übereinander angeordneten Brennern, die in Strömungsrichtung der Abgase gegeneinander gerichtet sind, derart, dass eine gleichsinnige Abgasströmung im Heizraum entsteht. Es wird eine gleichsinnige ringförmige Strömung der Abgase im Heizraum über dessen gesamte Höhe erzeugt. Aufgrund der ringförmigen Strömung der Abgase und der gute Umwälzung der Abgase der vertikal übereinander angeordneten Brenner wird eine gute Temperaturgleichmäßigkeit über die gesamte Höhe des Haubenglühofens erreicht.Preferably, a group of vertically stacked burners, which are directed towards one another in the flow direction of the exhaust gases, is located at the end faces of the heating hood, in such a way that a co-current exhaust gas flow is created in the heating chamber. It is generated in the same way annular flow of exhaust gases in the boiler room over its entire height. Due to the annular flow of the exhaust gases and the good circulation of the exhaust gases of the vertically stacked burner a good temperature uniformity over the entire height of the bell annealing furnace is achieved.

Vorzugsweise sind die Brenner als Hochgeschwindigkeitsbrenner ausgebildet.Preferably, the burners are designed as high-speed burners.

Das Verfahren zum Hochtemperatur-Glühen nach der Erfindung wird anhand der Zeichnung erläutert.The method for high-temperature annealing according to the invention will be explained with reference to the drawing.

In der Zeichnung zeigt

  • Fig. 1 eine schematische Draufsicht auf einen Haubenglühofen;
  • Fig. 2 eine schematische Vorderansicht auf einen Haubenglühofen nach der Erfindung;
  • Fig. 3 ein Diagramm mit einem Notspülverfahren nach der Erfindung.
In the drawing shows
  • Fig. 1 a schematic plan view of a bell annealing furnace;
  • Fig. 2 a schematic front view of a crucible annealing furnace according to the invention;
  • Fig. 3 a diagram with a Notspülverfahren according to the invention.

Fig. 1 und Fig. 2 zeigen schematisch eine Heizhaube 1 eines Haubenglühofens. Die Heizhaube 1 wird mittels zwei Gruppen von Brennern 2 in Form von Hochgeschwindigkeitsbrennern, vorzugsweise Rekuperatorbrennern, beheizt. Die Brenner 2 jeder Gruppe sind übereinander an den Stirnseiten der Heizhaube 1 angeordnet und brennen mit offenen Flammen in einen im Wesentlichen ringförmigen Heizraum 3. Die Anordnung der Brenner-Gruppen erfolgt gegeneinander, um über eine gleichsinnige Abgasströmung eine gute Umwälzung der Abgase der Flammen und damit eine gute Temperaturgleichmäßigkeit zu erreichen. Fig. 1 and Fig. 2 show schematically a heating hood 1 of a bell annealing furnace. The heating hood 1 is heated by means of two groups of burners 2 in the form of high-speed burners, preferably recuperative burners. The burners 2 of each group are arranged one above the other at the end faces of the heating hood 1 and burn with open flames in a substantially annular heating chamber 3. The arrangement of the burner groups takes place against each other to a good sense of exhaust gas flow a good circulation of the flue gases and thus to achieve a good temperature uniformity.

Den Brennern 2 wird zusätzliche Verbrennungsluft zur Verbrennung des vom Glühraum 5 durch die dynamische Dichtung in den Heizraum 3 entweichende Wasserstoffs zugeführt. Da die Flammen der Brenner 2 offen in den Heizraum 3 gerichtet sind, kann der Wasserstoff auf einfache Weise unschädlich gemacht werden.The burners 2 additional combustion air for combustion of the escape from the annealing chamber 5 through the dynamic seal in the heating chamber 3 escaping hydrogen. Since the flames of the burner 2 are directed open in the boiler room 3, the hydrogen can be made harmless in a simple manner.

Unter der Heizhaube 1 befinden sich drei Schutzhauben 4, die zu einem nicht dargestellten Herd mit nicht dargestellten dynamischen Dichtungen in Form von Sandtassen abgedichtet sind. Unter den Schutzhauben 4 wird je ein Glühraum 5 gebildet, in dem sich die Charge befindet.Under the heating hood 1 there are three protective hoods 4, which are sealed to a stove, not shown, with dynamic seals, not shown, in the form of sand cups. Under the protective hoods 4 each have a glow space 5 is formed in which the batch is located.

Sobald die Temperatur im Heizraum 750 °C überschreitet, können die Glühraume 5 mit Wasserstoff gespült werden. Die Sandtassen sind nicht gasdicht. Wasserstoff, der durch die Sandtassen-Dichtung in den Heizraum 3 gelangt, wird mittels Überschussluft an den Brennern 2, die geeignet dosiert wird, verbrannt.As soon as the temperature in the heating chamber exceeds 750 ° C., the annealing spaces 5 can be flushed with hydrogen. The sand cups are not gas-tight. Hydrogen, which passes through the sand cup seal in the heating chamber 3, is burned by means of excess air to the burners 2, which is dosed appropriately.

In dem Heizraum 3 unter der Heizhaube 1 und in jedem Glühraum 5 münden je eine Inertgas-Zuführung 6 einer Notspüleinrichtung zum gleichzeitigen Spülen des Heizraums 3 und des Glühraums 5 mit Inertgas, hier Stickstoff. Bei der Notspülung ist das Verhältnis des Inertgas-Volumenstroms, mit dem der Heizraum 3 gespült wird, und des Volumenstroms, mit denen die Glühräume 5 gespült werden, größer als 25.In the heating chamber 3 under the heating hood 1 and in each annealing chamber 5 each open an inert gas supply 6 an emergency flushing device for simultaneous flushing of the heating chamber 3 and the annealing chamber 5 with inert gas, in this case nitrogen. In the emergency purging, the ratio of the inert gas volume flow, with which the heating chamber 3 is purged, and the volume flow, with which the Glühräume 5 are purged, greater than 25.

Bei der Notspülung werden folglich der Heizraum 3 mit einem großen Inertgas-Volumenstrom und gleichzeitig jeweils die Glühräume 5 mit einem geringen Intergas-Volumenstrom gespült.In the emergency flushing consequently the heating chamber 3 are flushed with a large inert gas volume flow and at the same time in each case the Glühräume 5 with a low gas flow rate.

Im Störungsfall, wie z. B. bei einem Ausfall der Beheizung oder einem Stromausfall, wird die Anlage selbsttätig in einen sicheren Zustand gebracht. Normalerweise wird durch eine Stickstoff-Spülung der Schutzhauben 4 der Wasserstoff schnell ausgetrieben und gelangt in den Heizraum 3.In case of failure, such. B. in case of failure of the heating or a power failure, the system is automatically brought to a safe state. Normally, the hydrogen is quickly expelled by a nitrogen purge of the protective hoods 4 and enters the heating chamber. 3

Nun liegen aber nicht in jedem Fall die Voraussetzungen für eine sichere Verbrennung des ausgespülten Wasserstoffs im Heizraum 3 mittels der Brenner 2 vor. Beispielsweise kann die Temperatur inzwischen zu gering sein oder es steht wegen Stromausfall keine Verbrennungsluft zur Verfügung. Auch in diesen Fällen kann das Notspülverfahren eingeleitet.However, the conditions for a safe combustion of the flushed out hydrogen in the heating chamber 3 by means of the burners 2 are not always present in any case. For example, the temperature may now be too low or there is no combustion air available due to power failure. Also in these cases, the Notspülverfahren can be initiated.

In Fig. 3 ist das erfindungsgemäße Notspülverfahren dargestellt. In dem Diagramm ist der Inertgas-Volumenstrom (Ordinate; in m3/h) und die Wasserstoff- und Sauerstoff-Konzentration in % in Abhängigkeit von der Zeit (Abszisse; in min) dargestellt. Die untere Explosionsgrenze von Wasserstoff wird mit 2 % angesetzt.In Fig. 3 the emergency flushing process according to the invention is shown. The diagram shows the inert gas volume flow (ordinate, in m 3 / h) and the hydrogen and oxygen concentration in% as a function of time (abscissa, in min). The lower explosive limit of hydrogen is set at 2%.

Zum Zeitpunkt Null ist der Heizraum 3 unter der Heizhaube 1 mit Luft gefüllt, im Glühraum 5 unter den Schutzhauben 4 befindet sich reiner Wasserstoff.At time zero, the boiler room 3 is filled with air under the heating hood 1, in the heating chamber 5 under the protective hoods 4 is pure hydrogen.

Jede der drei Glühräume 5 unter den Schutzhauben 4 wird mit 2 m3/h Stickstoff gespült, der Heizraum 3 unter der Heizhaube 1 mit 240 m3/h. Das Verhältnis des Stickstoff-Volumenstroms mit dem die Heizhaube (240 m3/h) gespült wird und des Stickstoff-Volumenstroms, mit dem die Schutzhauben (3 x 2 m3/h = 6 m3/h) gespült werden, beträgt hier 40. Bei Verhältnissen unter 25 gibt es unzulässig hohe Maxima der Wasserstoffkonzentration in der Heizhaube.Each of the three Glühräume 5 under the protective hoods 4 is purged with 2 m 3 / h of nitrogen, the boiler room 3 under the heating hood 1 with 240 m 3 / h. The ratio of the nitrogen volume flow with which the heating hood is purged (240 m 3 / h) and the nitrogen volume flow with which the protective hoods (3 × 2 m 3 / h = 6 m 3 / h) are purged is 40 At ratios below 25, there are impermissibly high maxima of the hydrogen concentration in the heating hood.

Die Prozeßtemperatur soll 400 °C betragen, die Gase expandieren entsprechend und beschleunigen so den Spülvorgang. Die maximale Wasserstoff-Konzentration in der Heizhaube beträgt unter 2 % und wird nach ca. 10 min erreicht. Zu diesem Zeitpunkt beträgt der Sauerstoff-Gehalt ebenfalls ca. 2 %. Im weiteren Verlauf geht der Wasserstoff-Gehalt in der Heizhaube 3 schnell gegen Null. Die Spülung der Glühräume unter den Schutzhauben 4 wird so lange fortgesetzt bis auch unter den Schutzhauben 4 der Wasserstoff auf unter 2 % ausgespült ist, was im vorliegenden Beispiel nach ca. 360 min erreicht ist. Damit sind Heizhaube 1 und Schutzhauben 4 im sicheren Zustand und die Notspülung wird beendet.The process temperature should be 400 ° C, the gases expand accordingly and thus speed up the flushing process. The maximum hydrogen concentration in the heating hood is less than 2% and is reached after approx. 10 min. At this time, the oxygen content is also about 2%. In the course of the hydrogen content in the heating hood 3 goes quickly to zero. The rinsing of the glaze chambers under the protective hoods 4 is continued until the hydrogen is also rinsed below the protective hoods 4 to less than 2%, which in the present Example after approx. 360 min is reached. This heating mantle 1 and 4 protective covers are in safe condition and the emergency flushing is terminated.

Im Rahmen der Erfindung sind ohne weiteres Abwandlungen möglich. So kann beispielsweise die Verbrennungsluft mittels eines zentralen Rekuperators vorgewärmt werden. Ferner kann den Brennern 2 die für die Verbrennung des Wasserstoffs benötigte Verbrennungsluft mittels einer Verbrennungsluftleitung zugeführt werden, die in dem Heizraum 3 mündet.Modifications are readily possible within the scope of the invention. For example, the combustion air can be preheated by means of a central recuperator. Further, the burners 2, the combustion air required for the combustion of the combustion air can be supplied by means of a combustion air duct, which opens into the heating chamber 3.

Claims (8)

  1. Method for annealing, at high temperatures, metal bands, sheet metal or wire, in particular grain-oriented electrical strip in the shape of coils in an annealing chamber (5) under protective gas or in a protective gas atmosphere in a hood-type furnace with a hearth with at least one charging area for a batch in the shape of a coil or a coil stack, with at least one protective hood (4), which covers the batch and under which there is formed the annealing chamber (5), with a dynamic seal between the protective hood (4) and the hearth and with a heating hood (1) which surrounds the protective hood (4) at a distance and under which there is formed a heating chamber (3),
    characterised in that the heating chamber (3) is heated with burners (2) whose open flames are directed into the heating chamber (3) and that in the annealing chamber (5) there is maintained an overpressure relative to the heating chamber (3) of at least 10 Pa and no more than 200 Pa, and that the overpressure between the annealing chamber (5) and the heating chamber (3) is continuously monitored during the annealing process, and that, in the event of a drop of the overpressure, an emergency purge is initiated, depending on the undershooting of a limit value, to purge the annealing chamber (5) under the protective hood (4) and the heating chamber (3) under der heating hood (1) with inert gas.
  2. Method according to claim 1,
    characterised in that during the emergency purge the annealing chamber (5) and the heating chamber (3) are purged with an inert gas volume flow, whereby the ratio of the inert gas volume flow used for purging the heating chamber (3) to the inert gas volume flow used for purging the annealing chamber (5) is larger than 25.
  3. Method according to claim 1 or 2,
    characterised in that additional combustion air is supplied to the burners (2) for the combustion of the hydrogen escaping from the annealing chamber (5) through the dynamic seal into the heating chamber (3).
  4. Method according to one of claims 1 to 3,
    characterised in that the flames of the burners (2) are directed into the heating chamber (3) in such a way that a same-sense annular flow of the exhaust gases is generated in the heating chamber (3) over its entire height.
  5. Hood-type annealing furnace for annealing, at high temperatures, metal bands, sheet metal or wire, in particular grain-oriented electrical strip in the shape of coils in an annealing chamber under protective gas or in a protective gas atmosphere in a hood-type furnace according to one of claims 1 to 4, with a hearth with at least one charging area for a batch in the shape of a coil or a coil stack, with at least one protective hood (4), which covers the batch and under which there is formed the annealing chamber (5), with a dynamic seal between the protective hood (4) and the hearth and with a heating hood (1) which surrounds the protective hood (4) at a distance and under which there is formed a heating chamber (3),
    characterised in that the heating hood (1) exhibits a plurality of liquid or gaseous fuel-operated burners (2) whose open flames are directed into the heating chamber (3) and that the hood-type annealing furnace exhibits an emergency purging device for purging the annealing chamber (5) under the protective hood (4) and the heating chamber (3) under the heating hood (1) with inert gas, with one inert gas supply (6) each leading into the annealing chamber (5) and into the heating chamber (3).
  6. Hood-type annealing furnace according to claim 5,
    characterised by at least one group of burners (2) which are arranged vertically above each other.
  7. Hood-type annealing furnace according to claim 6,
    characterised in that on the face sides of the heating hood (1) there are located in each case a group of burners (2) arranged vertically above each other, which are directed against each other in the direction of flow of the exhaust gases such that there develops inside the heating chamber (3) and exhaust gas flow in the same direction.
  8. Hood-type annealing furnace according to one of claims 5 to 7,
    characterised in that the burners (2) are designed as high-velocity burners.
EP10784250.2A 2009-10-09 2010-10-06 Method and hood-type annealing furnace for annealing metal bands at high temperatures Active EP2486157B9 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10784250T PL2486157T3 (en) 2009-10-09 2010-10-06 Method and hood-type annealing furnace for annealing metal bands at high temperatures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009049002 2009-10-09
PCT/EP2010/006097 WO2011042164A1 (en) 2009-10-09 2010-10-06 Method and hood-type annealing furnace for annealing metal bands at high temperatures

Publications (3)

Publication Number Publication Date
EP2486157A1 EP2486157A1 (en) 2012-08-15
EP2486157B1 true EP2486157B1 (en) 2017-12-20
EP2486157B9 EP2486157B9 (en) 2018-02-14

Family

ID=43567924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10784250.2A Active EP2486157B9 (en) 2009-10-09 2010-10-06 Method and hood-type annealing furnace for annealing metal bands at high temperatures

Country Status (4)

Country Link
EP (1) EP2486157B9 (en)
PL (1) PL2486157T3 (en)
TR (1) TR201802112T4 (en)
WO (1) WO2011042164A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020212723A1 (en) 2020-10-08 2022-04-14 Sms Group Gmbh Bell-type annealing furnace and method for cooling a material to be annealed in a bell-type annealing furnace

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3715479A1 (en) 2019-03-26 2020-09-30 Thyssenkrupp Electrical Steel Gmbh Lean method for secondary recrystallization of grain oriented electrical steel in a continuous processing line
EP3715480A1 (en) 2019-03-26 2020-09-30 Thyssenkrupp Electrical Steel Gmbh Iron-silicon material suitable for medium frequency applications

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4543891A (en) * 1984-04-12 1985-10-01 Westinghouse Electric Corp. Apparatus and process for heat treatment
US4846675A (en) * 1987-06-01 1989-07-11 Worthington Industries, Inc. Annealing furnace
DE3720251C1 (en) * 1987-06-19 1988-03-24 H-Peter Prof Charles Method for cleaning the off-gases from the annealing chamber (carburizing chamber, case-hardening chamber) of annealing installations in the steel industry
DD261380A5 (en) * 1987-07-24 1988-10-26 Ebner Industrieofenbau Gmbh,At METHOD FOR OPERATING A CONVECTION HOUSE GUN, INS. FOR STEEL WIRE OR TAPE
US5290017A (en) * 1993-03-01 1994-03-01 Indugas, Inc. Cooling cover for batch coil annealing furnace
US5380378A (en) * 1993-04-23 1995-01-10 Gas Research Institute Method and apparatus for batch coil annealing metal strip
JP5279157B2 (en) * 2001-07-19 2013-09-04 中外炉工業株式会社 Bell-type annealing furnace provided with regenerative alternating combustion apparatus and combustion method thereof
WO2006111246A1 (en) * 2005-04-18 2006-10-26 Loi Thermprocess Gmbh Industrial furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020212723A1 (en) 2020-10-08 2022-04-14 Sms Group Gmbh Bell-type annealing furnace and method for cooling a material to be annealed in a bell-type annealing furnace
WO2022073721A1 (en) 2020-10-08 2022-04-14 Sms Group Gmbh Hood-type annealing furnace and method for cooling annealing material located in a hood-type annealing furnace

Also Published As

Publication number Publication date
EP2486157A1 (en) 2012-08-15
TR201802112T4 (en) 2018-03-21
PL2486157T3 (en) 2018-05-30
EP2486157B9 (en) 2018-02-14
WO2011042164A1 (en) 2011-04-14

Similar Documents

Publication Publication Date Title
DE3035032C1 (en) Process for the heat treatment of wire coils and continuous furnace for carrying out the process
EP2486157B1 (en) Method and hood-type annealing furnace for annealing metal bands at high temperatures
DE3150343C2 (en) Method of operating a continuous tunnel annealing furnace
EP2406569A1 (en) High-temperature furnace for annealing sheet metal packets
DE1814032C3 (en) Haubengluhofen
EP3443133A1 (en) Method and furnace installation for heat treating metal strip
DE2849789A1 (en) METHOD AND DEVICE FOR ANNEALING OF TAPE MATERIAL REELED INTO BUNDS
DE2840097A1 (en) DEVICE FOR RECOVERY OF HEAT FROM HOT EXHAUST GAS
EP4139035B1 (en) Reactor and method for performing a chemical reaction
DE3045919C2 (en) Method and device for the final annealing of a grain-oriented electrical steel strip or sheet
DE1608228B2 (en) Method for stabilizing the reduction process when operating closed reduction furnaces
DE878949C (en) Pull-through furnace for the heat treatment of strips and wires
EP4226109B1 (en) Bell-type annealing furnace and method for cooling annealing material located in a bell-type annealing furnace
DD287570A5 (en) HOOD OVEN, ESPECIALLY FOR CARRYING OUT GLUEH OPERATIONS UNDER CONTROLLED ATMOSPHAUS OF METAL SHEETS IN COILS
EP1167554B1 (en) Tower-type furnace for heat treating of metal strip
DE464830C (en) Process for the operation of electric bright glow furnaces with uninterrupted operation in which the glow material and heating coil are surrounded by a protective gas
DE3705613A1 (en) Thermal insulation
AT507670B1 (en) TOWER FOR THE HEAT TREATMENT OF A METAL STRIP
EP3652354B1 (en) Method for reducing nitrogen oxides in strip heat treatment furnaces
EP2304061A1 (en) Process for the high-temperature annealing of grain-oriented magnetic steel strip in an inert gas atmosphere in a heat treatment furnace
DE102022106661A1 (en) Method and device for plasma nitriding and subsequent oxidation of a surface of a component
DE2356823A1 (en) Lifting hearth furnace peripheral seal - comprising loose refractory slabs bridging gap between wall and hearth
DE3444038A1 (en) Bell-type furnace and a method for heat-treating material to be treated
DE863350C (en) Furnace for annealing malleable iron in gas
DE102015009194A1 (en) Apparatus and method for reheating metallic products

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120314

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20170308

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WACHHOLDER, HORST

Inventor name: BURYAN, MICHAL

Inventor name: WENDT, PETER

Inventor name: MAASS, HARDY

Inventor name: MASCHLER, FRANK

Inventor name: BEUTEL, ACHIM

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

INTG Intention to grant announced

Effective date: 20170823

GRAJ Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR1

GRAL Information related to payment of fee for publishing/printing deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR3

GRAR Information related to intention to grant a patent recorded

Free format text: ORIGINAL CODE: EPIDOSNIGR71

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

INTC Intention to grant announced (deleted)
INTG Intention to grant announced

Effective date: 20171109

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 956451

Country of ref document: AT

Kind code of ref document: T

Effective date: 20180115

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502010014494

Country of ref document: DE

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180320

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180321

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180320

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180420

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502010014494

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20180921

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181006

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181006

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20191001

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20101006

Ref country code: MK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201006

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230517

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20230928

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231020

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20231019

Year of fee payment: 14

Ref country code: IT

Payment date: 20231026

Year of fee payment: 14

Ref country code: FR

Payment date: 20231024

Year of fee payment: 14

Ref country code: DE

Payment date: 20231020

Year of fee payment: 14

Ref country code: CZ

Payment date: 20231002

Year of fee payment: 14

Ref country code: AT

Payment date: 20231020

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20231019

Year of fee payment: 14