EP4226109B1 - Bell-type annealing furnace and method for cooling annealing material located in a bell-type annealing furnace - Google Patents

Bell-type annealing furnace and method for cooling annealing material located in a bell-type annealing furnace Download PDF

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Publication number
EP4226109B1
EP4226109B1 EP21777975.0A EP21777975A EP4226109B1 EP 4226109 B1 EP4226109 B1 EP 4226109B1 EP 21777975 A EP21777975 A EP 21777975A EP 4226109 B1 EP4226109 B1 EP 4226109B1
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EP
European Patent Office
Prior art keywords
cooling gas
hood
cooling
base
annealing furnace
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EP21777975.0A
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German (de)
French (fr)
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EP4226109C0 (en
EP4226109A1 (en
Inventor
Frank Maschler
Jörg ROSTEK
Hardy Maass
Andreas Elsing
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SMS Group GmbH
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SMS Group GmbH
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Classifications

    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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
    • 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
    • F27D7/02—Supplying steam, vapour, gases or liquids
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/0005—Cooling of furnaces the cooling medium being a gas
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0072—Cooling of charges therein the cooling medium being a gas
    • F27D2009/0078—Cooling of charges therein the cooling medium being a gas in indirect contact with the charge

Definitions

  • the invention relates to a hood annealing furnace for annealing annealing material, comprising at least one base which has at least one storage space on which at least one batch of the annealing material can be arranged, at least one protective hood with which the annealing material arranged on the storage space can be covered to form an annealing space enclosed by the protective hood and the storage space, at least one heating hood with which the protective hood can be covered to form an intermediate space arranged between the heating hood and the protective hood and delimited on the bottom side by the base, and at least one cooling gas system which is or can be connected in a communicating manner to the intermediate space.
  • the invention also relates to a method for cooling an annealing material located in a hood annealing furnace using a cooling gas which, for cooling the annealing material, is passed through a space formed between a protective hood of the hood annealing furnace, with which the annealing material arranged on a parking space of a base of the hood annealing furnace is covered to form an annealing space enclosed by the protective hood and the parking space, and a heating hood of the hood annealing furnace, with which the protective hood is covered, and which is delimited on the bottom side by the base.
  • Hood annealing furnaces are used, for example, for high-temperature annealing of grain-oriented electrical steel, in which the electrical steel is annealed at very high temperatures between 1100 °C and 1200 °C.
  • the grain-oriented electrical steel is usually introduced into a hood annealing furnace in batches, whereby a batch can be formed, for example, by an electrical steel wound into a coil or a stack of such coils.
  • a grain-oriented electrical steel strip can be used, for example, to produce an iron core or a wound core for an electrical machine, such as a transformer or a generator.
  • EN 10 2012 221 511 A1 discloses a cooling hood for a hood furnace for cooling annealing material that has previously been heated with a heating hood, which is arranged for heating and cooling within a protective hood of the hood furnace.
  • the cooling hood has a cooling hood body for placing over the protective hood, a cooling gas supply opening in the cooling hood body for supplying cooling gas into an intermediate space between the protective hood and the cooling hood body, a cooling gas outlet opening in the cooling hood body for discharging supplied cooling gas from the intermediate space, a closing device for selectively closing or at least partially opening the cooling gas outlet opening and a ventilation device for ventilating the cooling gas between the cooling gas supply opening and the cooling gas outlet opening.
  • EP 2 486 157 B1 discloses a hood annealing furnace for high-temperature annealing of metal strip, sheet or wire, in particular grain-oriented electrical steel strip in the form of coils in an annealing chamber under protective gas or in a protective gas atmosphere in a hood furnace.
  • the hood annealing furnace has a hearth with at least one storage space for a charge in the form of a coil or a coil stack, at least one protective hood that covers the charge and under which the annealing chamber is formed, a dynamic seal between the protective hood and hearth, and a heating hood that surrounds the protective hood at a distance and under which a heating chamber is formed.
  • the heating hood has a plurality of burners operated with liquid or gaseous fuel, the flames of which are openly directed into the heating chamber.
  • the hood annealing furnace has an emergency purging device for purging the annealing chamber under the protective hood and the heating chamber under the heating hood with inert gas, with an inert gas supply opening into the annealing chamber and the heating chamber.
  • An object of the invention is to simplify operation of a bell annealing furnace.
  • a hood annealing furnace according to the invention for annealing annealing material has at least one base, which has at least one storage space on which at least one batch of the annealing material can be arranged, at least one protective hood with which the annealing material arranged on the storage space can be covered to form an annealing space enclosed by the protective hood and the storage space, at least one heating hood with which the protective hood can be covered to form an intermediate space arranged between the heating hood and the protective hood and delimited on the bottom side by the base, and at least one cooling gas system which is or can be connected in a communicating manner to the intermediate space.
  • the cooling gas system is connected via at least one cooling gas system formed on the base and connected in a communicating manner to the intermediate space. Cooling gas outlet and at least one cooling gas inlet formed on the base and communicating with the intermediate space are communicatively connected or connectable to the intermediate space.
  • the cooling gas system is independent of the heating hood, so that the weight of the heating hood is not increased by the cooling gas system.
  • the heating hood can be moved under a lower crane load, which simplifies the operation of the hood annealing furnace.
  • the heating and cooling functions or the components of the hood annealing furnace used for this are structurally clearly separated from one another, which makes the structure of the hood annealing furnace clearer and simpler overall, which also means that operation is simplified.
  • the cooling gas system is connected to the base, which does not have to be moved to operate the hood annealing furnace.
  • Two or more cooling gas outlets and/or two or more cooling gas inlets can also be formed on the base, via which the cooling gas system is or can be connected to the intermediate space.
  • the respective cooling gas outlet or cooling gas inlet can be formed, for example, as an opening or through-hole on the base.
  • the base works together with the heating hood to close off the space between the heating hood and the protective hood arranged on the base's location from the outside when the heating hood is placed on the base and sealed off from it.
  • the base can also have two or more locations, each of which can accommodate at least one batch of the material to be annealed.
  • the protective hood works together with the parking space or a section of the base surrounding the parking space to protect the glow space between the parking space or base and the protective hood placed on the parking space or base. to be closed to the outside if the protective hood is placed on the parking space or base and sealed against it.
  • the hood annealing furnace has a separate or individual protective hood for each parking space. If the respective protective hood is placed on the parking space or base and the heating hood is placed on the base, the space between them is limited by the heating hood, the protective hood and the base.
  • a cooling gas can be passed through the intermediate space to cool the annealed material, whereby the cooling gas cools the material indirectly via the respective protective hood and a gas located in the annealing chamber.
  • the cooling gas system can be continuously connected to the intermediate space in a communicating manner.
  • the cooling gas system can be connected to the intermediate space only for carrying out a cooling process, i.e. it can be connected to the intermediate space in a communicating manner if required by means of locking devices arranged on the cooling gas outlet and the cooling gas inlet, for example electrically controllable or manually actuated.
  • the annealing material can be, for example, a grain-oriented electrical steel strip.
  • a batch of the annealing material can be formed, for example, by winding the grain-oriented electrical steel strip into a coil or by a stack of at least two such coils.
  • the cooling gas system has at least one cooling gas guide that is connected in a communicating manner to the cooling gas outlet and the cooling gas inlet, at least one cooling unit arranged on the cooling gas guide and at least one fan arranged on the cooling gas guide.
  • the cooling gas guide can have at least one cooling gas line.
  • the cooling unit can be designed as an active or passive cooling unit.
  • the cooling unit can have at least one heat exchanger.
  • the base has at least two storage spaces arranged at a distance from one another and the bell-type annealing furnace has its own protective hood for each storage space, wherein the protective hoods can be covered with a single common heating hood, at least one cooling gas inlet is formed on the base for each storage space, each cooling gas inlet is connected to the at least one cooling gas outlet via the cooling gas duct and the cooling gas system has a single cooling unit arranged on the cooling gas duct and a single fan arranged on the cooling gas duct.
  • each storage space is assigned at least one separate cooling gas inlet, a relatively uniform simultaneous cooling of annealed annealing material can be carried out on the storage spaces.
  • the cooling unit and the fan can be arranged on a common cooling gas main line of the cooling gas system, at one end of which cooling gas branch lines branch off, the number of which corresponds at least to the number of parking spaces and which are individually connected to the respective cooling gas inlet.
  • the cooling gas system has at least one electrically controllable adjusting device, by means of which a cooling gas volume flow to the respective cooling gas inlet can be adjusted.
  • This adjusting device can be arranged, for example, on a cooling gas branch line branching off from an above-mentioned cooling gas main line.
  • the cooling gas system can have its own adjusting device for each cooling gas branch line branching off in this way in order to be able to individually adjust the cooling gas volume flow flowing through the respective branching cooling gas branch line. This makes it possible to optimize the simultaneous cooling of annealing material in several locations on the base.
  • the respective adjusting device can have at least one flap arranged in the respective cooling gas branch line and at least one electrically controllable or manually operable drive that operates the flap.
  • the cooling gas outlet is arranged in a central area of the base between the parking spaces. This allows the cooling gas heated during cooling to be sucked out centrally from the intermediate space, while the cooled cooling gas can be supplied, for example, in edge areas of the intermediate space. Two or more cooling gas outlets can also be arranged in the central area of the base between the parking spaces.
  • At least a large part of the cooling gas duct, the cooling unit and the fan are arranged on the floor below the base. This allows the cooling gas system to be arranged largely in one area, for example in a basement of a system located below the floor on which the base is placed, where the space is less restricted than above the floor.
  • the bell-type annealing furnace according to one of the above-mentioned embodiments or a combination of at least two of these embodiments can be used to carry out the method.
  • the cooling gas extracted from the intermediate space is cooled by means of at least one cooling unit and then introduced into the intermediate space.
  • a cooling gas volume flow to the respective cooling gas inlet is individually adjusted.
  • Figure 1 shows a schematic representation of an embodiment of a hood annealing furnace 1 according to the invention for annealing annealing material not shown.
  • the hood annealing furnace 1 has a base 2 which has four storage locations 3 to 6 arranged in a row at a distance from one another, on each of which a charge (not shown) of the annealing material can be arranged.
  • the hood annealing furnace 1 has a separate protective hood (not shown) for each storage location 3, 4, 5 or 6, with which the annealing material arranged on the respective storage location 3, 4, 5 or 6 can be covered to form an annealing space (not shown) enclosed by the respective protective hood and the respective storage location 3, 4, 5 or 6.
  • the hood annealing furnace 1 has a single heating hood (not shown) with which the protective hoods can be covered to form a gap (not shown) arranged between the heating hood and the protective hoods and delimited on the bottom side by the base 2.
  • the bell annealing furnace 1 has a cooling gas system 7 that is or can be connected to the intermediate space in a communicating manner.
  • the cooling gas system 7 is or can be connected to the intermediate space in a communicating manner via two cooling gas outlets 8 formed on the base 2 and connected to the intermediate space in a communicating manner and eight cooling gas inlets 9 formed on the base 2 and connected to the intermediate space in a communicating manner.
  • the cooling gas outlets 8 are arranged in a central area of the base 2 between the parking spaces 3 and 4 on the one hand and 5 and 6 on the other.
  • the cooling gas inlets 9 are present in pairs for each parking space 3, 4, 5 and 6, respectively, so that two cooling gas inlets 9 are formed on the base 2 for each parking space 3, 4, 5 or 6.
  • the cooling gas system 7 has a cooling gas guide 10 communicating with the cooling gas outlets 8 and the cooling gas inlets 9, a single cooling unit 11 arranged on the cooling gas guide 10 and a single fan 12 arranged on the cooling gas guide 10. Each cooling gas inlet 9 is connected to the cooling gas outlets 8 via the cooling gas guide 10.
  • the cooling gas guide 10 has a cooling gas main line 13 on which the cooling unit 11 and the fan 12 are arranged.
  • the cooling gas main line 13 is connected at one end to the cooling gas outlets 8 via cooling gas branch lines 14.
  • the other end of the cooling gas main line 13 is connected to cooling gas branch lines 15, the other ends of which are in turn connected to the cooling gas inlets 9 via two cooling gas branch lines 16.
  • the cooling gas system 7 has four electrically controllable adjusting devices 17, each of which is arranged on one of the cooling gas branch lines 15 and by means of which a cooling gas volume flow to the respective pair of cooling gas inlets 9 can be individually adjusted.
  • At least a major part of the cooling gas duct 10, the cooling unit 11 and the fan 12 are arranged on the bottom side below the base 2, which in Figure 1 is not shown for reasons of clarity.

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

Description

Die Erfindung betrifft einen Haubenglühofen zum Glühen von Glühgut, aufweisend wenigstens einen Sockel, der wenigstens einen Stellplatz, auf dem wenigstens eine Charge des Glühguts anordbar ist, aufweist, wenigstens eine Schutzhaube, mit der das auf dem Stellplatz angeordnete Glühgut unter Ausbildung eines durch die Schutzhaube und den Stellplatz umschlossenen Glühraums abdeckbar ist, wenigstens eine Heizhaube, mit der die Schutzhaube unter Ausbildung eines zwischen der Heizhaube und der Schutzhaube angeordneten und bodenseitig durch den Sockel begrenzten Zwischenraums abdeckbar ist, und wenigstens ein kommunizierend mit dem Zwischenraum verbundenes oder verbindbares Kühlgassystem.The invention relates to a hood annealing furnace for annealing annealing material, comprising at least one base which has at least one storage space on which at least one batch of the annealing material can be arranged, at least one protective hood with which the annealing material arranged on the storage space can be covered to form an annealing space enclosed by the protective hood and the storage space, at least one heating hood with which the protective hood can be covered to form an intermediate space arranged between the heating hood and the protective hood and delimited on the bottom side by the base, and at least one cooling gas system which is or can be connected in a communicating manner to the intermediate space.

Zudem betrifft die Erfindung ein Verfahren zum Kühlen eines in einem Haubenglühofen befindlichen Glühguts unter Verwendung eines Kühlgases, das zum Kühlen des Glühguts durch einen zwischen einer Schutzhaube des Haubenglühofens, mit der das auf einem Stellplatz eines Sockels des Haubenglühofens angeordnete Glühgut unter Ausbildung eines durch die Schutzhaube und den Stellplatz umschlossenen Glühraums abgedeckt ist, und einer Heizhaube des Haubenglühofens, mit der die Schutzhaube abgedeckt ist, ausgebildeten, bodenseitig durch den Sockel begrenzten Zwischenraum geführt wird.The invention also relates to a method for cooling an annealing material located in a hood annealing furnace using a cooling gas which, for cooling the annealing material, is passed through a space formed between a protective hood of the hood annealing furnace, with which the annealing material arranged on a parking space of a base of the hood annealing furnace is covered to form an annealing space enclosed by the protective hood and the parking space, and a heating hood of the hood annealing furnace, with which the protective hood is covered, and which is delimited on the bottom side by the base.

Haubenglühöfen werden beispielsweise zum Hochtemperatur-Glühen von kornorientiertem Elektroband eingesetzt, bei dem das Elektroband bei sehr hohen Temperaturen zwischen 1100 °C und 1200 °C geglüht wird. Das kornorientierte Elektroband wird hierzu meist chargenweise in einen Haubenglühofen eingebracht, wobei eine Charge beispielsweise durch ein zu einem Coil gewickelten Elektroband oder einem Stapel aus solchen Coils gebildet sein kann.Hood annealing furnaces are used, for example, for high-temperature annealing of grain-oriented electrical steel, in which the electrical steel is annealed at very high temperatures between 1100 °C and 1200 °C. The grain-oriented electrical steel is usually introduced into a hood annealing furnace in batches, whereby a batch can be formed, for example, by an electrical steel wound into a coil or a stack of such coils.

Ein kornorientiertes Elektroband kann beispielsweise zur Herstellung eines Eisenkerns bzw. eines gewickelten Kerns für eine elektrische Maschine, beispielsweise einen Transformator oder einen Generator, verwendet werden.A grain-oriented electrical steel strip can be used, for example, to produce an iron core or a wound core for an electrical machine, such as a transformer or a generator.

DE 10 2012 221 511 A1 offenbart eine Kühlhaube für einen Haubenofen zum Abkühlen von zuvor mit einer Heizhaube erwärmtem Glühgut, das zum Erwärmen und zum Kühlen innerhalb einer Schutzhaube des Haubenofens angeordnet ist. Die Kühlhaube weist einen Kühlhaubenkörper zum Aufsetzen über die Schutzhaube, eine Kühlgaszuführöffnung in dem Kühlhaubenkörper zum Zuführen von Kühlgas in einen Zwischenraum zwischen Schutzhaube und Kühlhaubenkörper, eine Kühlgasauslassöffnung in dem Kühlhaubenkörper zum Abführen von zugeführtem Kühlgas aus dem Zwischenraum, eine Verschließeinrichtung zum selektiven Verschließen oder zumindest teilweise Öffnen der Kühlgasauslassöffnung und eine Ventilationseinrichtung zum Ventilieren des Kühlgases zwischen der Kühlgaszuführöffnung und der Kühlgasauslassöffnung auf. EN 10 2012 221 511 A1 discloses a cooling hood for a hood furnace for cooling annealing material that has previously been heated with a heating hood, which is arranged for heating and cooling within a protective hood of the hood furnace. The cooling hood has a cooling hood body for placing over the protective hood, a cooling gas supply opening in the cooling hood body for supplying cooling gas into an intermediate space between the protective hood and the cooling hood body, a cooling gas outlet opening in the cooling hood body for discharging supplied cooling gas from the intermediate space, a closing device for selectively closing or at least partially opening the cooling gas outlet opening and a ventilation device for ventilating the cooling gas between the cooling gas supply opening and the cooling gas outlet opening.

EP 2 486 157 B1 offenbart 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. Der Haubenglühofen weist einen Herd mit mindestens einem Stellplatz für eine Charge in Form von einem Coil oder einem Coil-Stapel, mindestens eine Schutzhaube, die die Charge abdeckt und unter der der Glühraum ausgebildet wird, eine dynamische Dichtung zwischen Schutzhaube und Herd sowie eine die Schutzhaube mit Abstand umgebene Heizhaube, unter der ein Heizraum gebildet wird, auf. Die Heizhaube weist eine Mehrzahl von mit flüssigem oder gasförmigem Brennstoff betriebenen Brennern auf, deren Flammen offen in den Heizraum gerichtet sind. Der Haubenglühofen weist eine Notspüleinrichtung zum Spülen des Glühraumes unter der Schutzhaube und des Heizraumes unter der Heizhaube mit Inertgas auf, wobei im Glühraum und im Heizraum je eine Inertgas-Zuführung münden. EP 2 486 157 B1 discloses a hood annealing furnace for high-temperature annealing of metal strip, sheet or wire, in particular grain-oriented electrical steel strip in the form of coils in an annealing chamber under protective gas or in a protective gas atmosphere in a hood furnace. The hood annealing furnace has a hearth with at least one storage space for a charge in the form of a coil or a coil stack, at least one protective hood that covers the charge and under which the annealing chamber is formed, a dynamic seal between the protective hood and hearth, and a heating hood that surrounds the protective hood at a distance and under which a heating chamber is formed. The heating hood has a plurality of burners operated with liquid or gaseous fuel, the flames of which are openly directed into the heating chamber. The hood annealing furnace has an emergency purging device for purging the annealing chamber under the protective hood and the heating chamber under the heating hood with inert gas, with an inert gas supply opening into the annealing chamber and the heating chamber.

Des Weiteren ist es bekannt, eine Heizhaube eines Haubenglühofens mit einem Kühlsystem auszustatten, was jedoch zu einem relativ komplizierten Aufbau der Heizhaube führt, mit Restriktionen in der Gestaltung der an der Heizhaube angeordneten Heizeinrichtung einhergeht und zu einem sehr hohen Gewicht der Heizhaube führt, die dann nur noch mit einem leistungsstarken Kran bewegt werden kann.Furthermore, it is known to equip a heating hood of a hood annealing furnace with a cooling system, but this leads to a relatively complicated structure of the heating hood, is accompanied by restrictions in the design of the heating device arranged on the heating hood and leads to a very high weight of the heating hood, which can then only be moved with a powerful crane.

Eine Aufgabe der Erfindung ist es, einen Betrieb eines Haubenglühofens zu vereinfachen.An object of the invention is to simplify operation of a bell annealing furnace.

Diese Aufgabe wird durch die unabhängigen Patentansprüche gelöst. Vorteilhafte Ausgestaltungen sind in der nachfolgenden Beschreibung, den abhängigen Patentansprüchen und der Figur wiedergegeben, wobei diese Ausgestaltungen jeweils für sich genommen oder in Kombination von wenigstens zwei dieser Ausgestaltungen miteinander einen weiterbildenden, insbesondere auch bevorzugten oder vorteilhaften Aspekt der Erfindung darstellen können. Ausgestaltungen des Haubenglühofens können dabei Ausgestaltungen des Verfahrens entsprechen, und umgekehrt, selbst wenn im Folgenden hierauf im Einzelfall nicht explizit hingewiesen wird.This object is achieved by the independent patent claims. Advantageous embodiments are reproduced in the following description, the dependent patent claims and the figure, whereby these embodiments, each taken individually or in combination of at least two of these embodiments with one another, can represent a further developing, in particular preferred or advantageous aspect of the invention. Embodiments of the bell annealing furnace can correspond to embodiments of the method, and vice versa, even if this is not explicitly referred to in the individual case below.

Ein erfindungsgemäßer Haubenglühofen zum Glühen von Glühgut weist wenigstens einen Sockel, der wenigstens einen Stellplatz, auf dem wenigstens eine Charge des Glühguts anordbar ist, aufweist, wenigstens eine Schutzhaube, mit der das auf dem Stellplatz angeordnete Glühgut unter Ausbildung eines durch die Schutzhaube und den Stellplatz umschlossenen Glühraums abdeckbar ist, wenigstens eine Heizhaube, mit der die Schutzhaube unter Ausbildung eines zwischen der Heizhaube und der Schutzhaube angeordneten und bodenseitig durch den Sockel begrenzten Zwischenraums abdeckbar ist, und wenigstens ein kommunizierend mit dem Zwischenraum verbundenes oder verbindbares Kühlgassystem auf. Das Kühlgassystem ist über wenigstens einen an dem Sockel ausgebildeten, kommunizierend mit dem Zwischenraum verbundenen Kühlgasauslass und wenigstens einen an dem Sockel ausgebildeten, kommunizierend mit dem Zwischenraum verbundenen Kühlgaseinlass kommunizierend mit dem Zwischenraum verbunden bzw. verbindbar.A hood annealing furnace according to the invention for annealing annealing material has at least one base, which has at least one storage space on which at least one batch of the annealing material can be arranged, at least one protective hood with which the annealing material arranged on the storage space can be covered to form an annealing space enclosed by the protective hood and the storage space, at least one heating hood with which the protective hood can be covered to form an intermediate space arranged between the heating hood and the protective hood and delimited on the bottom side by the base, and at least one cooling gas system which is or can be connected in a communicating manner to the intermediate space. The cooling gas system is connected via at least one cooling gas system formed on the base and connected in a communicating manner to the intermediate space. Cooling gas outlet and at least one cooling gas inlet formed on the base and communicating with the intermediate space are communicatively connected or connectable to the intermediate space.

Erfindungsgemäß ist das Kühlgassystem unabhängig von der Heizhaube, so dass das Gewicht der Heizhaube nicht durch das Kühlgassystem erhöht wird. Hierdurch kann die Heizhaube unter geringerer Kranlast bewegt werden, was den Betrieb des Haubenglühofens vereinfacht. Zudem sind die Funktionen Heizen und Kühlen bzw. die dazu verwendeten Komponenten des Haubenglühofens baulich klar voneinander getrennt, was den Aufbau des Haubenglühofens insgesamt übersichtlicher und einfacher macht, was ebenso mit einem vereinfachten Betrieb einhergeht.According to the invention, the cooling gas system is independent of the heating hood, so that the weight of the heating hood is not increased by the cooling gas system. This means that the heating hood can be moved under a lower crane load, which simplifies the operation of the hood annealing furnace. In addition, the heating and cooling functions or the components of the hood annealing furnace used for this are structurally clearly separated from one another, which makes the structure of the hood annealing furnace clearer and simpler overall, which also means that operation is simplified.

Statt mit der Heizhaube ist das Kühlgassystem mit dem Sockel verbunden, der nicht zum Betreiben des Haubenglühofens bewegt werden muss. An dem Sockel können auch zwei oder mehr Kühlgasauslässe und/oder zwei oder mehr Kühlgaseinlässe ausgebildet sein, über die das Kühlgassystem kommunizierend mit dem Zwischenraum verbunden bzw. verbindbar ist. Der jeweilige Kühlgasauslass bzw. Kühlgaseinlass kann beispielsweise als Durchbrechung oder Durchgangsbohrung an dem Sockel ausgebildet sein.Instead of the heating hood, the cooling gas system is connected to the base, which does not have to be moved to operate the hood annealing furnace. Two or more cooling gas outlets and/or two or more cooling gas inlets can also be formed on the base, via which the cooling gas system is or can be connected to the intermediate space. The respective cooling gas outlet or cooling gas inlet can be formed, for example, as an opening or through-hole on the base.

Der Sockel wirkt mit der Heizhaube zusammen, um den Zwischenraum zwischen der Heizhaube und der auf dem Stellplatz des Sockels aufgestellten Schutzhaube angeordneten Zwischenraum nach außen zu verschließen, wenn die Heizhaube auf den Sockel aufgestellt und gegenüber diesem abgedichtet ist. Der Sockel kann auch zwei oder mehr Stellplätze aufweisen, auf denen jeweils wenigstens eine Charge des Glühguts anordbar ist.The base works together with the heating hood to close off the space between the heating hood and the protective hood arranged on the base's location from the outside when the heating hood is placed on the base and sealed off from it. The base can also have two or more locations, each of which can accommodate at least one batch of the material to be annealed.

Die Schutzhaube wirkt mit dem Stellplatz oder einem den Stellplatz umgebenden Abschnitt des Sockels zusammen, um den Glühraum zwischen dem Stellplatz bzw. Sockel und der auf den Stellplatz bzw. den Sockel aufgestellten Schutzhaube nach außen zu verschließen, wenn die Schutzhaube auf den Stellplatz bzw. Sockel aufgestellt und gegenüber diesem abgedichtet ist. Der Haubenglühofen weist für jeden Stellplatz eine separate bzw. eigene Schutzhaube auf. Wenn die jeweilige Schutzhaube auf den Stellplatz bzw. Sockel aufgestellt ist und die Heizhaube auf den Sockel aufgestellt ist, ist der Zwischenraum durch die Heizhaube, die Schutzhaube und den Sockel begrenzt.The protective hood works together with the parking space or a section of the base surrounding the parking space to protect the glow space between the parking space or base and the protective hood placed on the parking space or base. to be closed to the outside if the protective hood is placed on the parking space or base and sealed against it. The hood annealing furnace has a separate or individual protective hood for each parking space. If the respective protective hood is placed on the parking space or base and the heating hood is placed on the base, the space between them is limited by the heating hood, the protective hood and the base.

Mittels des Kühlgassystems kann zum Kühlen des geglühten Glühguts ein Kühlgas durch den Zwischenraum geführt werden, wobei das Kühlgas das Glühgut indirekt über die jeweilige Schutzhaube und ein in dem Glühraum befindliches Gas kühlt.By means of the cooling gas system, a cooling gas can be passed through the intermediate space to cool the annealed material, whereby the cooling gas cools the material indirectly via the respective protective hood and a gas located in the annealing chamber.

Das Kühlgassystem kann ununterbrochen kommunizierend mit dem Zwischenraum verbunden sein. Alternativ kann das Kühlgassystem lediglich zur Durchführung eines Kühlvorgangs mit dem Zwischenraum verbunden werden, also mittels an dem Kühlgasauslass und dem Kühlgaseinlass angeordneten, beispielsweise elektrisch ansteuerbaren oder manuell betätigbaren, Schließeinrichtungen bei Bedarf kommunizierend mit dem Zwischenraum verbindbar sein.The cooling gas system can be continuously connected to the intermediate space in a communicating manner. Alternatively, the cooling gas system can be connected to the intermediate space only for carrying out a cooling process, i.e. it can be connected to the intermediate space in a communicating manner if required by means of locking devices arranged on the cooling gas outlet and the cooling gas inlet, for example electrically controllable or manually actuated.

Das Glühgut kann beispielsweise ein kornorientiertes Elektroband sein. Eine Charge des Glühguts kann beispielsweise durch ein Wickeln des kornorientierten Elektrobands zu einem Coil oder durch einen Stapel aus wenigstens zwei solcher Coils gebildet sein.The annealing material can be, for example, a grain-oriented electrical steel strip. A batch of the annealing material can be formed, for example, by winding the grain-oriented electrical steel strip into a coil or by a stack of at least two such coils.

Gemäß einer vorteilhaften Ausgestaltung weist das Kühlgassystem wenigstens eine kommunizierend mit dem Kühlgasauslass und dem Kühlgaseinlass verbundene Kühlgasführung, wenigstens eine an der Kühlgasführung angeordnete Kühleinheit und wenigstens ein an der Kühlgasführung angeordnetes Gebläse auf. Hierdurch wird es möglich, das verwendete Kühlgas mittels des Gebläses in dem Kühlgassystem und dem kommunizierend damit verbundenen Zwischenraum umzuwälzen und nach seiner Kühlung mittels der Kühleinheit wieder dem Zwischenraum zuzuführen. Hierzu kann die Kühlgasführung wenigstens eine Kühlgasleitung aufweisen. Die Kühleinheit kann als aktive oder als passive Kühleinheit ausgebildet sein. Die Kühleinheit kann wenigstens einen Wärmetauscher aufweisen.According to an advantageous embodiment, the cooling gas system has at least one cooling gas guide that is connected in a communicating manner to the cooling gas outlet and the cooling gas inlet, at least one cooling unit arranged on the cooling gas guide and at least one fan arranged on the cooling gas guide. This makes it possible to circulate the cooling gas used by means of the fan in the cooling gas system and the intermediate space that is connected in a communicating manner to circulate and, after cooling, to feed it back into the intermediate space by means of the cooling unit. For this purpose, the cooling gas guide can have at least one cooling gas line. The cooling unit can be designed as an active or passive cooling unit. The cooling unit can have at least one heat exchanger.

Gemäß einer weiteren vorteilhaften Ausgestaltung weist der Sockel wenigstens zwei beabstandet voneinander angeordnete Stellplätze und der Haubenglühofen für jeden Stellplatz eine eigene Schutzhaube auf, wobei die Schutzhauben mit einer einzigen gemeinsamen Heizhaube abdeckbar sind, an dem Sockel für jeden Stellplatz wenigstens ein Kühlgaseinlass ausgebildet ist, jeder Kühlgaseinlass über die Kühlgasführung mit dem wenigstens einen Kühlgasauslass verbunden ist und das Kühlgassystem eine einzige an der Kühlgasführung angeordnete Kühleinheit und ein einziges an der Kühlgasführung angeordnetes Gebläse aufweist. Hierdurch sind trotz des Vorhandenseins von wenigstens zwei Stellplätzen lediglich eine einzige Kühleinheit und ein einziges Gebläse erforderlich, was den apparativen Aufwand und damit verbundene Kosten senkt und einen Bauraumbedarf reduziert. Da jedem Stellplatz wenigstens ein eigener Kühlgaseinlass zugeordnet ist, kann eine relativ gleichmäßige gleichzeitige Kühlung von geglühtem Glühgut auf den Stellplätzen durchgeführt werden. Die Kühleinheit und das Gebläse können dabei an einer gemeinsamen Kühlgashauptleitung des Kühlgassystems angeordnet sein, an deren einem Ende Kühlgaszweigleitungen abzweigen, deren Anzahl zumindest der Anzahl der Stellplätze entspricht und die einzeln mit dem jeweiligen Kühlgaseinlass verbunden sind.According to a further advantageous embodiment, the base has at least two storage spaces arranged at a distance from one another and the bell-type annealing furnace has its own protective hood for each storage space, wherein the protective hoods can be covered with a single common heating hood, at least one cooling gas inlet is formed on the base for each storage space, each cooling gas inlet is connected to the at least one cooling gas outlet via the cooling gas duct and the cooling gas system has a single cooling unit arranged on the cooling gas duct and a single fan arranged on the cooling gas duct. As a result, despite the presence of at least two storage spaces, only a single cooling unit and a single fan are required, which reduces the equipment outlay and associated costs and reduces the installation space required. Since each storage space is assigned at least one separate cooling gas inlet, a relatively uniform simultaneous cooling of annealed annealing material can be carried out on the storage spaces. The cooling unit and the fan can be arranged on a common cooling gas main line of the cooling gas system, at one end of which cooling gas branch lines branch off, the number of which corresponds at least to the number of parking spaces and which are individually connected to the respective cooling gas inlet.

Gemäß einer weiteren vorteilhaften Ausgestaltung weist das Kühlgassystem wenigstens eine elektrisch ansteuerbare Stelleinrichtung auf, mittels der ein Kühlgasvolumenstrom zu dem jeweiligen Kühlgaseinlass einstellbar ist. Diese Stelleinrichtung kann beispielsweise an einer von einer oben genannten Kühlgashauptleitung abzweigenden Kühlgaszweigleitung angeordnet sein. Das Kühlgassystem kann für jede derart abzweigende Kühlgaszweigleitung eine eigene Stelleinrichtung aufweisen, um den durch die jeweilige abzweigende Kühlgaszweigleitung strömenden Kühlgasvolumenstrom individuell einstellen zu können. Hierdurch kann die gleichzeitige Kühlung von Glühgut auf mehreren Stellplätzen des Sockels optimiert werden. Die jeweilige Stelleinrichtung kann wenigstens eine in der jeweiligen Kühlgaszweigleitung angeordnete Klappe und wenigstens einen die Klappe betätigenden, elektrisch ansteuerbaren oder manuell betätigbaren Antrieb aufweisen.According to a further advantageous embodiment, the cooling gas system has at least one electrically controllable adjusting device, by means of which a cooling gas volume flow to the respective cooling gas inlet can be adjusted. This adjusting device can be arranged, for example, on a cooling gas branch line branching off from an above-mentioned cooling gas main line. The The cooling gas system can have its own adjusting device for each cooling gas branch line branching off in this way in order to be able to individually adjust the cooling gas volume flow flowing through the respective branching cooling gas branch line. This makes it possible to optimize the simultaneous cooling of annealing material in several locations on the base. The respective adjusting device can have at least one flap arranged in the respective cooling gas branch line and at least one electrically controllable or manually operable drive that operates the flap.

Gemäß einer weiteren vorteilhaften Ausgestaltung ist der Kühlgasauslass in einem zwischen den Stellplätzen liegenden mittigen Bereich des Sockels angeordnet. Hierdurch kann das während der Kühlung erwärmte Kühlgas zentral aus dem Zwischenraum abgesaugt werden, während die Zuführung des gekühlten Kühlgases beispielsweise in Randbereichen des Zwischenraums erfolgen kann. Es können auch zwei oder mehr Kühlgasauslässe in dem zwischen den Stellplätzen liegenden mittigen Bereich des Sockels angeordnet sein.According to a further advantageous embodiment, the cooling gas outlet is arranged in a central area of the base between the parking spaces. This allows the cooling gas heated during cooling to be sucked out centrally from the intermediate space, while the cooled cooling gas can be supplied, for example, in edge areas of the intermediate space. Two or more cooling gas outlets can also be arranged in the central area of the base between the parking spaces.

Gemäß einer weiteren vorteilhaften Ausgestaltung sind zumindest ein größter Teil der Kühlgasführung, die Kühleinheit und das Gebläse bodenseitig unterhalb des Sockels angeordnet. Hierdurch kann das Kühlgassystem weitestgehend in einem Bereich, beispielsweise in einem unter dem Boden, auf den der Sockel aufgestellt ist, befindlichen Keller einer Anlage, angeordnet werden, wo die Platzverhältnisse weniger eingeschränkt sind als oberhalb des Bodens.According to a further advantageous embodiment, at least a large part of the cooling gas duct, the cooling unit and the fan are arranged on the floor below the base. This allows the cooling gas system to be arranged largely in one area, for example in a basement of a system located below the floor on which the base is placed, where the space is less restricted than above the floor.

Gemäß einem erfindungsgemäßen Verfahren zum Kühlen eines in einem Haubenglühofen befindlichen Glühguts unter Verwendung eines Kühlgases, das zum Kühlen des Glühguts durch einen zwischen einer Schutzhaube des Haubenglühofens, mit der das auf einem Stellplatz eines Sockels des Haubenglühofens angeordnete Glühgut unter Ausbildung eines durch die Schutzhaube und den Stellplatz umschlossenen Glühraums abgedeckt ist, und einer Heizhaube des Haubenglühofens, mit der die Schutzhaube abgedeckt ist, ausgebildeten, bodenseitig durch den Sockel begrenzten Zwischenraum geführt wird, wird das zum Kühlen bereits eingesetzte Kühlgas über wenigstens einen an dem Sockel ausgebildeten Kühlgasauslass aus dem Zwischenraum abgesaugt und das zum Kühlen noch einzusetzende Kühlgas über wenigstens einen an dem Sockel ausgebildeten Kühlgaseinlass in den Zwischenraum eingeleitet.According to a method according to the invention for cooling an annealing material located in a hood annealing furnace using a cooling gas which is used to cool the annealing material through a space between a protective hood of the hood annealing furnace, with which the annealing material arranged on a storage space of a base of the hood annealing furnace is covered to form an annealing space enclosed by the protective hood and the storage space, and a heating hood of the hood annealing furnace, with which the protective hood is covered, formed intermediate space delimited at the bottom by the base, the cooling gas already used for cooling is sucked out of the intermediate space via at least one cooling gas outlet formed on the base and the cooling gas still to be used for cooling is introduced into the intermediate space via at least one cooling gas inlet formed on the base.

Mit dem Verfahren sind die oben mit Bezug auf den Haubenglühofen genannten Vorteile entsprechend verbunden. Insbesondere kann der Haubenglühofen gemäß einer der oben genannten Ausgestaltungen oder einer Kombination von wenigstens zwei dieser Ausgestaltungen miteinander zur Durchführung des Verfahrens verwendet werden.The advantages mentioned above with reference to the bell-type annealing furnace are correspondingly associated with the method. In particular, the bell-type annealing furnace according to one of the above-mentioned embodiments or a combination of at least two of these embodiments can be used to carry out the method.

Gemäß einer vorteilhaften Ausgestaltung wird das aus dem Zwischenraum abgesaugte Kühlgas mittels wenigstens einer Kühleinheit gekühlt und anschließend in den Zwischenraum eingeleitet. Mit dieser Ausgestaltung sind die oben mit Bezug auf die entsprechende Ausgestaltung des Haubenglühofens genannten Vorteile entsprechend verbunden.According to an advantageous embodiment, the cooling gas extracted from the intermediate space is cooled by means of at least one cooling unit and then introduced into the intermediate space. This embodiment is associated with the advantages mentioned above with reference to the corresponding embodiment of the bell annealing furnace.

Gemäß einer weiteren vorteilhaften Ausgestaltung wird ein Kühlgasvolumenstrom zu dem jeweiligen Kühlgaseinlass individuell eingestellt wird. Mit dieser Ausgestaltung sind die oben mit Bezug auf die entsprechende Ausgestaltung des Haubenglühofens genannten Vorteile entsprechend verbunden.According to a further advantageous embodiment, a cooling gas volume flow to the respective cooling gas inlet is individually adjusted. The advantages mentioned above with reference to the corresponding embodiment of the bell annealing furnace are correspondingly associated with this embodiment.

Im Folgenden wird die Erfindung unter Bezugnahme auf die anliegende Figur anhand einer bevorzugten Ausführungsform beispielhaft erläutert, wobei die nachfolgend erläuterten Merkmale sowohl jeweils für sich genommen als auch in Kombination von wenigstens zwei dieser Merkmale miteinander einen vorteilhaften oder weiterbildenden Aspekt der Erfindung darstellen können. Es zeigt:

Figur 1:
eine schematische Darstellung eines Ausführungsbeispiels für einen erfindungsgemäßen Haubenglühofen.
In the following, the invention is explained by way of example with reference to the attached figure using a preferred embodiment, wherein the features explained below can represent an advantageous or further developing aspect of the invention both individually and in combination of at least two of these features with one another. It shows:
Figure 1:
a schematic representation of an embodiment of a hood annealing furnace according to the invention.

Figur 1 zeigt eine schematische Darstellung eines Ausführungsbeispiels für einen erfindungsgemäßen Haubenglühofen 1 zum Glühen von nicht gezeigtem Glühgut. Figure 1 shows a schematic representation of an embodiment of a hood annealing furnace 1 according to the invention for annealing annealing material not shown.

Der Haubenglühofen 1 weist einen Sockel 2 auf, der vier in einer Reihe beabstandet voneinander angeordnete Stellplätze 3 bis 6 aufweist, auf denen jeweils eine nicht gezeigte Charge des Glühguts anordbar ist.The hood annealing furnace 1 has a base 2 which has four storage locations 3 to 6 arranged in a row at a distance from one another, on each of which a charge (not shown) of the annealing material can be arranged.

Zudem weist der Haubenglühofen 1 für jeden Stellplatz 3, 4, 5 bzw. 6 eine eigene nicht gezeigte Schutzhaube auf, mit denen jeweils das auf dem jeweiligen Stellplatz 3, 4, 5 bzw. 6 angeordnete Glühgut unter Ausbildung von jeweils einem durch die jeweilige Schutzhaube und den jeweiligen Stellplatz 3, 4, 5 bzw. 6 umschlossenen, nicht gezeigten Glühraum abdeckbar ist.In addition, the hood annealing furnace 1 has a separate protective hood (not shown) for each storage location 3, 4, 5 or 6, with which the annealing material arranged on the respective storage location 3, 4, 5 or 6 can be covered to form an annealing space (not shown) enclosed by the respective protective hood and the respective storage location 3, 4, 5 or 6.

Darüber hinaus weist der Haubenglühofen 1 eine einzige nicht gezeigte Heizhaube auf, mit der die Schutzhauben unter Ausbildung eines zwischen der Heizhaube und den Schutzhauben angeordneten und bodenseitig durch den Sockel 2 begrenzten, nicht gezeigten Zwischenraums abdeckbar sind.In addition, the hood annealing furnace 1 has a single heating hood (not shown) with which the protective hoods can be covered to form a gap (not shown) arranged between the heating hood and the protective hoods and delimited on the bottom side by the base 2.

Ferner weist der Haubenglühofen 1 ein kommunizierend mit dem Zwischenraum verbundenes oder verbindbares Kühlgassystem 7 auf. Das Kühlgassystem 7 ist über zwei an dem Sockel 2 ausgebildete, kommunizierend mit dem Zwischenraum verbundene Kühlgasauslässe 8 und acht an dem Sockel 2 ausgebildete, kommunizierend mit dem Zwischenraum verbundene Kühlgaseinlässe 9 kommunizierend mit dem Zwischenraum verbunden bzw. verbindbar. Die Kühlgasauslässe 8 sind in einem zwischen den Stellplätzen 3 und 4 einerseits und 5 und 6 andererseits liegenden mittigen Bereich des Sockels 2 angeordnet. Die Kühlgaseinlässe 9 sind für jeden Stellplatz 3, 4, 5 bzw. 6 paarweise vorhanden, so dass an dem Sockel 2 für jeden Stellplatz 3, 4, 5 bzw. 6 zwei Kühlgaseinlässe 9 ausgebildet sind.Furthermore, the bell annealing furnace 1 has a cooling gas system 7 that is or can be connected to the intermediate space in a communicating manner. The cooling gas system 7 is or can be connected to the intermediate space in a communicating manner via two cooling gas outlets 8 formed on the base 2 and connected to the intermediate space in a communicating manner and eight cooling gas inlets 9 formed on the base 2 and connected to the intermediate space in a communicating manner. The cooling gas outlets 8 are arranged in a central area of the base 2 between the parking spaces 3 and 4 on the one hand and 5 and 6 on the other. The cooling gas inlets 9 are present in pairs for each parking space 3, 4, 5 and 6, respectively, so that two cooling gas inlets 9 are formed on the base 2 for each parking space 3, 4, 5 or 6.

Das Kühlgassystem 7 weist eine kommunizierend mit den Kühlgasauslässen 8 und den Kühlgaseinlässen 9 verbundene Kühlgasführung 10, eine einzige an der Kühlgasführung 10 angeordnete Kühleinheit 11 und ein einziges an der Kühlgasführung 10 angeordnetes Gebläse 12 auf. Jeder Kühlgaseinlass 9 ist über die Kühlgasführung 10 mit den Kühlgasauslässen 8 verbunden.The cooling gas system 7 has a cooling gas guide 10 communicating with the cooling gas outlets 8 and the cooling gas inlets 9, a single cooling unit 11 arranged on the cooling gas guide 10 and a single fan 12 arranged on the cooling gas guide 10. Each cooling gas inlet 9 is connected to the cooling gas outlets 8 via the cooling gas guide 10.

Die Kühlgasführung 10 weist eine Kühlgashauptleitung 13 auf, an der die Kühleinheit 11 und das Gebläse 12 angeordnet sind. Die Kühlgashauptleitung 13 ist an einem Ende über Kühlgaszweigleitungen 14 mit den Kühlgasauslässen 8 verbunden. Das andere Ende der Kühlgashauptleitung 13 ist mit Kühlgaszweigleitungen 15 verbunden, deren andere Enden wiederum über zwei Kühlgaszweigleitungen 16 mit den Kühlgaseinlässen 9 verbunden sind.The cooling gas guide 10 has a cooling gas main line 13 on which the cooling unit 11 and the fan 12 are arranged. The cooling gas main line 13 is connected at one end to the cooling gas outlets 8 via cooling gas branch lines 14. The other end of the cooling gas main line 13 is connected to cooling gas branch lines 15, the other ends of which are in turn connected to the cooling gas inlets 9 via two cooling gas branch lines 16.

Das Kühlgassystem 7 weist vier elektrisch ansteuerbare Stelleinrichtungen 17 auf, die jeweils an einer der Kühlgaszweigleitungen 15 angeordnet sind und mittels denen ein Kühlgasvolumenstrom zu dem jeweiligen Paar aus Kühlgaseinlässen 9 individuell einstellbar ist.The cooling gas system 7 has four electrically controllable adjusting devices 17, each of which is arranged on one of the cooling gas branch lines 15 and by means of which a cooling gas volume flow to the respective pair of cooling gas inlets 9 can be individually adjusted.

Zumindest ein größter Teil der Kühlgasführung 10, die Kühleinheit 11 und das Gebläse 12 sind bodenseitig unterhalb des Sockels 2 angeordnet, was in Figur 1 aus Gründen der Darstellbarkeit nicht gezeigt ist.At least a major part of the cooling gas duct 10, the cooling unit 11 and the fan 12 are arranged on the bottom side below the base 2, which in Figure 1 is not shown for reasons of clarity.

BezugszeichenlisteList of reference symbols

11
HaubenglühofenBell annealing furnace
22
Sockelbase
33
Stellplatzparking space
44
Stellplatzparking space
55
Stellplatzparking space
66
Stellplatzparking space
77
KühlgassystemCooling gas system
88th
KühlgasauslassCooling gas outlet
99
KühlgaseinlassCooling gas inlet
1010
KühlgasführungCooling gas routing
1111
KühleinheitCooling unit
1212
Gebläsefan
1313
KühlgashauptleitungRefrigerant gas main line
1414
KühlgaszweigleitungRefrigerant gas branch line
1515
KühlgaszweigleitungRefrigerant gas branch line
1616
KühlgaszweigleitungRefrigerant gas branch line
1717
StelleinrichtungAdjustment device

Claims (9)

  1. Hood-type annealing furnace (1) for the annealing of annealing material, comprising at least one base (2), which comprises at least one site (3, 4, 5, 6) on which at least one batch of the annealing material can be arranged, at least one protective hood, by which the annealing material arranged on the site (3, 4, 5, 6) can be covered with formation of an annealing space enclosed by the protective hood and the site (3, 4, 5, 6), at least one heating hood, by which the protective hood can be covered with formation of an intermediate space arranged between the heating hood and the protective hood and bounded at the bottom by the base (2), and at least one cooling gas system (7) connected or connectible with the intermediate space to be in communication therewith, characterised in that the cooling gas system (7) is connected or connectible with the intermediate space to be in communication therewith by way of at least one cooling gas outlet (8), which is formed at the base (2) and is connected with the intermediate space to be in communication therewith, and at least one cooling gas inlet (9), which is formed at the base (2) and is connected with the intermediate space to be in communication therewith.
  2. Hood-type annealing furnace (1) according to claim 1, characterised in that the cooling gas system (7) comprises at least one cooling gas conduit (10), which is connected with the cooling gas outlet (8) and the cooling gas inlet (9) to be in communication therewith, at least one cooling unit (11) arranged at the cooling gas conduit (10) and at least one fan (12) arranged at the cooling gas conduit (10).
  3. Hood-type annealing furnace (1) according to claim 2, characterised in that the base (2) comprises at least two sites (3, 4, 5, 6) arranged at a spacing from one another and the hood-type annealing furnace (1) has an individual protective hood for each site (3, 4, 5, 6), wherein the protective hood can be covered by a single common heating hood, at least one cooling gas inlet (9) is formed at the base (2) for each site (3, 4, 5, 6), each cooling gas inlet (9) is connected with the at least one cooling gas outlet (8) by way of the cooling gas conduit (10) and the cooling gas system (7) comprises a single cooling unit (11) arranged at the cooling gas conduit (10) and a single fan (12) arranged at the cooling gas conduit (10).
  4. Hood-type annealing furnace (1) according to claim 3, characterised in that the cooling gas system (7) comprises at least one electrically activatable setting device (17) by means of which a cooling gas volume flow to the respective cooling gas inlet (9) is settable.
  5. Hood-type annealing furnace (1) according to claim 3 or 4, characterised in that the cooling gas outlet (8) is arranged in a central region of the base (2) lying between the sites (3, 4, 5, 6).
  6. Hood-type annealing furnace (1) according to any one of claims 1 to 5, characterised in that the cooling gas conduit (10) for at least the greatest part, the cooling unit (11) and the fan (12) are arranged at the bottom below the base (2).
  7. Method for cooling an annealing material, which is present in a hood-type annealing furnace (1), with use of a cooling gas which for cooling the annealing material is conducted through an intermediate space which is formed between a protective hood of the hood-type annealing furnace (1) - by which the annealing material arranged on a site (3, 4, 5, 6) of a base (2) of the hood-type annealing furnace (1) is covered with formation of an annealing space enclosed by the protective hood and the site (3, 4, 5, 6) - and a heating hood of the hood-type annealing furnace (1) - by which the protective hood is covered - and which is bounded at the bottom by the base (2), characterised in that the cooling gas already used for cooling is sucked out of the intermediate space by way of at least one cooling gas outlet (8) formed at the base (2) and the cooling gas still to be used for cooling is conducted into the intermediate space by way of at least one cooling gas inlet (9) formed at the base (2).
  8. Method according to claim 7, characterised in that the cooling gas sucked out of the intermediate space is cooled by means of at least one cooling unit (11) and subsequently introduced into the intermediate space.
  9. Method according to claim 7 or 8, characterised in that a cooling gas volume flow to the respective cooling gas inlet (9) is individually set.
EP21777975.0A 2020-10-08 2021-09-13 Bell-type annealing furnace and method for cooling annealing material located in a bell-type annealing furnace Active EP4226109B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020212723.9A DE102020212723A1 (en) 2020-10-08 2020-10-08 Bell-type annealing furnace and method for cooling a material to be annealed in a bell-type annealing furnace
PCT/EP2021/075028 WO2022073721A1 (en) 2020-10-08 2021-09-13 Hood-type annealing furnace and method for cooling annealing material located in a hood-type annealing furnace

Publications (3)

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EP4226109A1 EP4226109A1 (en) 2023-08-16
EP4226109C0 EP4226109C0 (en) 2024-04-17
EP4226109B1 true EP4226109B1 (en) 2024-04-17

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EP21777975.0A Active EP4226109B1 (en) 2020-10-08 2021-09-13 Bell-type annealing furnace and method for cooling annealing material located in a bell-type annealing furnace

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US (1) US20230366628A1 (en)
EP (1) EP4226109B1 (en)
DE (1) DE102020212723A1 (en)
WO (1) WO2022073721A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT354500B (en) * 1978-03-01 1980-01-10 Voest Ag METHOD AND DEVICE FOR THE TREATMENT OF COLD-ROLLED METAL TAPES
DE3824415A1 (en) * 1988-07-19 1990-01-25 Gottfried Von Czarnowski Cooling hood for rapid cooling of red-hot material, in particular steel strip
WO2010089056A2 (en) * 2009-02-04 2010-08-12 Loi Thermprocess Gmbh Method and system for heat treating sheet metal
EP2486157B9 (en) 2009-10-09 2018-02-14 LOI Thermprocess GmbH Method and hood-type annealing furnace for annealing metal bands at high temperatures
JP5845791B2 (en) * 2011-10-05 2016-01-20 Ｊｆｅスチール株式会社 Cooling equipment for annealing furnace
DE102012221511C5 (en) 2012-11-23 2019-01-17 Ebner-Industrieofenbau Gmbh Cooling hood for slow cooling of annealed material
DE102012023430A1 (en) * 2012-11-30 2014-06-05 Bilstein Gmbh & Co. Kg Hood annealing furnace and method for operating such

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US20230366628A1 (en) 2023-11-16
DE102020212723A1 (en) 2022-04-14
EP4226109C0 (en) 2024-04-17
WO2022073721A1 (en) 2022-04-14
EP4226109A1 (en) 2023-08-16

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