EP1167554B1 - Tower-type furnace for heat treating of metal strip - Google Patents

Tower-type furnace for heat treating of metal strip Download PDF

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Publication number
EP1167554B1
EP1167554B1 EP01890160A EP01890160A EP1167554B1 EP 1167554 B1 EP1167554 B1 EP 1167554B1 EP 01890160 A EP01890160 A EP 01890160A EP 01890160 A EP01890160 A EP 01890160A EP 1167554 B1 EP1167554 B1 EP 1167554B1
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EP
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Prior art keywords
muffle
section
temperature section
metal strip
gas
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EP01890160A
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German (de)
French (fr)
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EP1167554A3 (en
EP1167554A2 (en
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Peter Helmut Dipl.-Ing. Ebner
Heribert Dipl.-Ing. Lochner
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D9/66—Tower-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
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details

Definitions

  • the invention relates to a tower furnace for heat treatment of metal strips with a preheating section and an adjoining thereto, a preheating separate housing forming high-temperature section, wherein the preheating equipped with a preferably gas-heated muffle preheating a top inserted into the muffing plug of heat-insulating material for the High temperature section has.
  • Metal strips in particular of chromium or chromium-nickel steels are continuously bright annealed in a protective gas atmosphere of hydrogen or a hydrogen-nitrogen mixture in so-called Turmöfen, which may be formed with a muffle or muffellos.
  • Turmöfen which may be formed with a muffle or muffellos.
  • the heat treatment of metal strips via a muffle heated from the outside has the advantage that gas burners can be used without the flue gases impairing the protective gas atmosphere inside the muffle.
  • the oven temperature is limited by the heat loadability of the muffle.
  • the muffle length achievable throughput speed of the metal strip to be treated so that the muffle clamped in the region of its upper end is exposed to the heat load and the burden of its own weight, despite one in Muffellhurscardi From bottom to top increasing wall thickness leads to a limitation of the sleeve length due to its own weight.
  • the reduced strength of the special steel used for the muffle which is reduced by the high temperature loads, must be taken into account.
  • Muffellose Turmöfen have a refractory lining and are electrically heated so that higher furnace temperatures can be achieved.
  • the refractory furnace lining is porous, it absorbs ambient air when opening the tower furnace, which must be flushed out, for example with a nitrogen gas, before a trouble-free heat treatment of the metal strips can be ensured under a protective gas atmosphere. Due to the necessary rinsing times muffellose Turmöfen are therefore only ready for use after several days after opening. In addition, there is a high hydrogen consumption, because the remaining after rinsing residual oxygen in the air with the hydrogen of the shielding gas connects to water.
  • the metal strip to be treated enters from the muffle of Vordozensrmabiteses by a top inserted into the muffle plugs of heat-insulating material in the high-temperature section where heated by means of the electric heater to the required final temperature before it enters a mounted on top of the tower furnace cooler , Because of the muffle-free high temperature section, a lower exit temperature of the strip to be treated from the muffle, which is advantageous for the muffle insert, can be accepted so that the restrictions imposed by the heat and weight loads of the muffle can not affect the result of the heat treatment or the throughput ,
  • the disadvantage is However, that the muffle-free high-temperature section with its refractory lining due to a significantly increased compared to muffle furnaces rinsing time after opening the furnace with a correspondingly increased hydrogen consumption. In addition, in the region of the high-temperature section, it is necessary to dispense with the economically advantageous gas heating in favor of a more expensive electrical heating.
  • the invention is therefore based on the object, a tower furnace for heat treatment of metal bands of the type described in such a way that despite the given by the heat and weight load of the muffle constraints, the required strip end temperature can be achieved without the associated with the use of a muffelsburg high-temperature section To accept disadvantages.
  • the invention solves the problem set by the fact that the high-temperature section is also provided with a preferably gas-heated muffle, which surrounds the connection plug outside and connects to these gas-tight preferably via a liquid seal.
  • the high-temperature section likewise has a muffle, in the high-temperature section, the advantages of a muffle, in particular with regard to flushing and the possible gas heating, can be advantageously utilized.
  • the muffle load can be limited by its own weight, which leads due to the associated lower strength requirements to a higher temperature resistance, which ensures the required final temperature of the treated metal bands. It is only to ensure a possible loss of heat transfer between the preheat and the high-temperature section over the connection plug.
  • the connecting plug from the lower end of the muffle of the high-temperature section is externally enclosed, wherein a gas-tight connection between the connecting plug and muffle of the high-temperature section must be achieved, with the possibility of axial Muffelverschiebung opposite the connecting plug to compensate for thermal expansion of the muffle.
  • a known liquid seal can be advantageously used.
  • the heat-insulating, refractory material of the connection plug has a comparatively small volume, so that the flushing process is hardly affected by the connection plug. Since the connecting plug in the heat radiation is both the muffle of Vorissermabites and the muffle of the high-temperature section, it can be assumed that substantially continuous over the furnace length strip heating, which has an advantageous effect on the required overall length of the furnace.
  • the connecting plug In order to ensure a band heating that is as unobstructed as possible by the connecting plug, the connecting plug must be provided with a sufficiently large passage cross section for the metal bands so that the thermal radiation of the two muffles can also extend into the region of the connecting plug.
  • the connecting plug may have a passage cross-section for the metal strip to be treated with a minimum width measured perpendicular to the metal strip corresponding to half the outer radius of the connecting plug.
  • the illustrated tower furnace for heat treatment of metal strips has a frame 1, which carries a housing 2 for a preheating section 3 and above the preheating section 3 a housing 4 for a high-temperature section 5. These two furnace sections 3 and 5 are through each other a connection plug 6 made of a heat-insulating, refractory material connected.
  • the lower preheating section 3 is provided with a muffle 7, which is inserted from above into the housing 2 and can also be removed upwards again when the housing 4 of the high-temperature section is laterally offset in the furnace frame 1 for this purpose.
  • the muffle 7 are common, not shown for reasons of clarity gas burner, with the help of the annular space 8 between the muffle 7 and the refractory lining 9 of the housing 2 is heated.
  • a liquid seal 11 is provided in the form of a plug surrounding the annular space, which is filled with a sealing liquid, for. As oil, is filled and in which the lower end of the muffle 7 protrudes.
  • the high temperature section 5 of the tower furnace is configured.
  • the inserted from above into the housing 4 muffle 12 of the high-temperature section 5 encloses with its lower end the connecting plug 6, which carries on its outer side an annular space 13 for a liquid seal 14, so that the lower end of the muffle 12 is immersed in the bath of the liquid seal 14 ,
  • the heating of the muffle 12 is advantageously carried out again via gas burners whose exhaust gases flowing into the annular space 15 between muffle 12 and housing lining 16 heat the muffle 12.
  • the required final temperature for the metal strips to be treated can be achieved despite the respective use of a muffle 7 or 12, without having to fear an overload of the muffles 7 and 12.
  • Due to the lower temperature in the preheating section 3 and the limited length of the muffle 7 results in an advantageous utilization of the material properties of the muffle 7, for example, a Length of 26 m may have.
  • the muffle 12 for the high-temperature section 5 only needs to be 10 m in length in order to achieve the desired strip end temperature of, for example, 1100 ° C.
  • the burden of its own weight remains low, so that because of the associated lower strength requirements of the material, the temperature load can be increased.
  • the temperature load of the muffle 7 can be kept lower, which allows the use of higher strength values.
  • the muffle 7 with a length of 26 m for the special steel used has a weight of about 17 t, while the weight of the muffle 12 with a length of 10 m is about 7 t.
  • a comparable muffle with a total length of 36 m would have a weight of about 33 t. It turns out, therefore, that a weight saving of almost 30% is possible by the inventive design.
  • the required expansion height can be significantly reduced. While in a continuous muffle with a length of 36 m, an expansion height of about 80 m is required, the expansion height according to the invention is only 60 m, if for the muffle 7 has a length of about 26 m and for the muffle 12 of 10 m is estimated.
  • the cross-section of the passage 17 of the connecting plug 6 for the metal strip to be treated is to be chosen to be sufficiently large.
  • Has the passage cross-section a measured perpendicular to the metal strip minimum width 18, which corresponds to half the outer radius or a quarter of the outer diameter of the connecting plug 6, as the Fig. 2 can be removed, resulting in terms of the penetration of the heat radiation of the muffle 7 and 12 on the passage 17 of the connecting plug 6 advantageous conditions that have a favorable effect on the overall length of the tower furnace.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Tunnel Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

Tower furnace has a preheating section and a high temperature section connected above it forming a housing. The preheated section equipped with a gas-heated muffle has a stop in the muffle made of heat-insulating material for the high temperature section. High temperature section is provided with gas-heated muffle which surrounds the stop from the outside and is connected to it via a liquid seal. Preferred Features: The stop has a passage cross-section for the metal strip to be treated with a low width measured vertically to the metal strip and corresponding to the half radius of the stop.

Description

Die Erfindung bezieht sich auf einen Turmofen zur Wärmebehandlung von Metallbändern mit einem Vorwärmabschnitt und einem daran nach oben anschließenden, ein vom Vorwärmabschnitt gesondertes Gehäuse bildenden Hochtemperaturabschnitt, wobei der mit einer vorzugsweise gasbeheizten Muffel ausgerüstete Vorwärmabschnitt einen oben in die Muffel eingesetzten Anschlußstopfen aus wärmeisolierendem Werkstoff für den Hochtemperaturabschnitt aufweist.The invention relates to a tower furnace for heat treatment of metal strips with a preheating section and an adjoining thereto, a preheating separate housing forming high-temperature section, wherein the preheating equipped with a preferably gas-heated muffle preheating a top inserted into the muffing plug of heat-insulating material for the High temperature section has.

Metallbänder, insbesondere aus Chrom- oder Chrom-Nickel-Stählen werden in einer Schutzgasatmosphäre aus Wasserstoff oder einem Wasserstoff-Stickstoffgemisch in sogenannten Turmöfen kontinuierlich blankgeglüht, die mit einer Muffel oder muffellos ausgebildet sein können. Die Wärmebehandlung von Metallbändern über eine von außen beheizte Muffel bringt den Vorteil mit sich, daß Gasbrenner eingesetzt werden können, ohne daß die Rauchgase die Schutzgasatmosphäre im Muffelinneren beeinträchtigen. Die Ofentemperatur ist jedoch durch die Wärmebelastbarkeit der Muffel begrenzt. Dazu kommt, daß aufgrund der von der Muffel auf das Metallband zu übertragenden Wärmemenge die Muffellänge die erreichbare Durchlaufgeschwindigkeit des zu behandelnden Metallbandes bestimmt, so daß die im Bereich ihres oberen Endes eingespannte Muffel neben der Wärmebelastung auch der Belastung durch das Eigengewicht ausgesetzt ist, was trotz einer in Muffellängsrichtung von unten nach oben zunehmenden Wanddicke zu einer Beschränkung der Muffellänge zufolge des Eigengewichtes führt. In diesem Zusammenhang ist die bei den hohen Temperaturbelastungen verringerte Festigkeit des für die Muffel eingesetzten Sonderstahls zu berücksichtigen.Metal strips, in particular of chromium or chromium-nickel steels are continuously bright annealed in a protective gas atmosphere of hydrogen or a hydrogen-nitrogen mixture in so-called Turmöfen, which may be formed with a muffle or muffellos. The heat treatment of metal strips via a muffle heated from the outside has the advantage that gas burners can be used without the flue gases impairing the protective gas atmosphere inside the muffle. However, the oven temperature is limited by the heat loadability of the muffle. In addition, due to the muffle to be transferred to the metal band amount of heat, the muffle length achievable throughput speed of the metal strip to be treated, so that the muffle clamped in the region of its upper end is exposed to the heat load and the burden of its own weight, despite one in Muffellängsrichtung From bottom to top increasing wall thickness leads to a limitation of the sleeve length due to its own weight. In this context, the reduced strength of the special steel used for the muffle, which is reduced by the high temperature loads, must be taken into account.

Muffellose Turmöfen weisen eine feuerfeste Auskleidung auf und werden elektrisch beheizt, so daß höhere Ofentemperaturen erreicht werden können. Da die feuerfeste Ofenauskleidung jedoch porös ist, nimmt sie beim Öffnen des Turmofens Umgebungsluft auf, die beispielsweise mit einem Stickstoffgas ausgespült werden muß, bevor eine störungsfreie Wärmebehandlung der Metallbänder unter einer Schutzgasatmosphäre sichergestellt werden kann. Aufgrund der notwendigen Spülzeiten sind daher muffellose Turmöfen nach einem Öffnen erst wieder nach mehreren Tagen einsatzbereit. Außerdem stellt sich ein hoher Wasserstoffverbrauch ein, weil sich der nach dem Spülen noch vorhandene Rest an Luftsauerstoff mit dem Wasserstoff des Schutzgases zu Wasser verbindet.Muffellose Turmöfen have a refractory lining and are electrically heated so that higher furnace temperatures can be achieved. However, since the refractory furnace lining is porous, it absorbs ambient air when opening the tower furnace, which must be flushed out, for example with a nitrogen gas, before a trouble-free heat treatment of the metal strips can be ensured under a protective gas atmosphere. Due to the necessary rinsing times muffellose Turmöfen are therefore only ready for use after several days after opening. In addition, there is a high hydrogen consumption, because the remaining after rinsing residual oxygen in the air with the hydrogen of the shielding gas connects to water.

Um trotz der mit einem Muffeleinsatz verbundenen Beschränkungen einen hohen Durchsatz der zu behandelnden Metallbänder zu erreichen, ist es bekannt ( EP 0 675 208 A1 ), an den mit einer Muffel versehenen Vorwärmabschnitt eines Turmofens nach oben einen muffellosen Hochtemperaturabschnitt anzuschließen, der ein vom Vorwärmabschnitt gesondertes Gehäuse bildet, das auf das Gehäuse des Vorwärmabschnittes aufgesetzt wird. Das zu behandelnde Metallband tritt aus der Muffel des Vorwärmabschnittes durch einen oben in die Muffel eingesetzten Anschlußstopfen aus wärmeisolierendem Werkstoff in den Hochtemperaturabschnitt ein, wo mit Hilfe der elektrischen Heizung auf die erforderliche Endtemperatur erwärmt wird, bevor es in einen oben auf den Turmofen aufgesetzten Kühler gelangt. Wegen des muffellosen Hochtemperaturabschnittes kann eine für den Muffeleinsatz vorteilhafte niedrigere Austrittstemperatur des zu behandelnden Bandes aus der Muffel in Kauf genommen werden, so daß die durch die Wärme- und Gewichtsbelastungen der Muffel gegebenen Einschränkungen sich nicht auf das Ergebnis der Wärmebehandlung oder auf die Durchsatzleistung auswirken können. Nachteilig ist allerdings, daß der muffellose Hochtemperaturabschnitt mit seiner feuerfesten Auskleidung eine im Vergleich zu Muffelöfen erheblich verlängerte Spülzeit nach einem Öffnen des Ofens mit einem entsprechend vergrößerten Wasserstoffverbrauch bedingt. Dazu kommt, daß im Bereich des Hochtemperaturabschnittes auf die wirtschaftlich vorteilhaftere Gasbeheizung zugunsten einer aufwendigeren elektrischen Beheizung verzichtet werden muß.In order to achieve a high throughput of the metal strips to be treated despite the limitations associated with a muffle insert, it is known ( EP 0 675 208 A1 ) to connect to the muffle preheating portion of a tower furnace up a mufflelosen high-temperature section, which forms a separate housing from the preheating section, which is placed on the housing of the preheating section. The metal strip to be treated enters from the muffle of Vorwärmabschnittes by a top inserted into the muffle plugs of heat-insulating material in the high-temperature section where heated by means of the electric heater to the required final temperature before it enters a mounted on top of the tower furnace cooler , Because of the muffle-free high temperature section, a lower exit temperature of the strip to be treated from the muffle, which is advantageous for the muffle insert, can be accepted so that the restrictions imposed by the heat and weight loads of the muffle can not affect the result of the heat treatment or the throughput , The disadvantage is However, that the muffle-free high-temperature section with its refractory lining due to a significantly increased compared to muffle furnaces rinsing time after opening the furnace with a correspondingly increased hydrogen consumption. In addition, in the region of the high-temperature section, it is necessary to dispense with the economically advantageous gas heating in favor of a more expensive electrical heating.

Der Erfindung liegt somit die Aufgabe zugrunde, einen Turmofen zur Wärmebehandlung von Metallbändern der eingangs geschilderten Art so auszugestalten, daß trotz der durch die Wärme- und Gewichtsbelastung der Muffel gegebenen Einschränkungen die geforderte Bandendtemperatur erreicht werden kann, ohne die mit dem Einsatz eines muffellosen Hochtemperaturabschnittes verbundenen Nachteile in Kauf nehmen zu müssen.The invention is therefore based on the object, a tower furnace for heat treatment of metal bands of the type described in such a way that despite the given by the heat and weight load of the muffle constraints, the required strip end temperature can be achieved without the associated with the use of a muffellosen high-temperature section To accept disadvantages.

Die Erfindung löst die gestellte Aufgabe dadurch, daß der Hochtemperaturabschnitt ebenfalls mit einer vorzugsweise gasbeheizten Muffel versehen ist, die den Anschlußstopfen außen umschließt und an diesen vorzugsweise über eine Flüssigkeitsdichtung gasdicht anschließt.The invention solves the problem set by the fact that the high-temperature section is also provided with a preferably gas-heated muffle, which surrounds the connection plug outside and connects to these gas-tight preferably via a liquid seal.

Da zufolge dieser Maßnahmen der Hochtemperaturabschnitt ebenfalls eine Muffel aufweist, können im Hochtemperaturabschnitt die Vorteile einer Muffel insbesondere hinsichtlich der Spülung und der möglichen Gasbeheizung vorteilhaft ausgenützt werden. Wegen der Beschränkung der Länge der Muffel im Hochtemperaturabschnitt kann die Muffelbelastung durch das Eigengewicht begrenzt werden, was aufgrund der damit verbundenen geringeren Festigkeitsanforderungen zu einer höheren Temperaturbelastbarkeit führt, die die geforderte Endtemperatur der zu behandelnden Metallbänder sicherstellt. Es ist lediglich für einen möglichst wärmeverlustfreien Übergang zwischen dem Vorwärm- und dem Hochtemperaturabschnitt über den Anschlußstopfen zu sorgen. Zu diesem Zweck wird der Anschlußstopfen vom unteren Ende der Muffel des Hochtemperaturabschnittes außen umschlossen, wobei eine gasdichte Verbindung zwischen Anschlußstopfen und Muffel des Hochtemperaturabschnittes erzielt werden muß, und zwar mit der Möglichkeit einer axialen Muffelverschiebung gegenüber dem Anschlußstopfen zum Ausgleich von Wärmedehnungen der Muffel. Zu diesem Zweck kann vorteilhaft eine an sich bekannte Flüssigkeitsdichtung eingesetzt werden. Es ist aber auch möglich, die gasdichte Verbindung über eine balgartige Manschette zwischen Muffel und Anschlußstopfen zu erreichen. Der wärmeisolierende, feuerfeste Werkstoff des Anschlußstopfens weist ein vergleichsweise geringes Volumen auf, so daß der Spülvorgang durch den Anschlußstopfen kaum beeinflußt wird. Da der Anschlußstopfen im Bereich der Wärmestrahlungen sowohl der Muffel des Vorwärmabschnittes als auch der Muffel des Hochtemperaturabschnittes liegt, kann von einer im wesentlichen über die Ofenlänge durchgehenden Banderwärmung ausgegangen werden, was sich vorteilhaft auf die erforderliche Gesamtlänge des Ofens auswirkt.Since, according to these measures, the high-temperature section likewise has a muffle, in the high-temperature section, the advantages of a muffle, in particular with regard to flushing and the possible gas heating, can be advantageously utilized. Because of the limitation of the length of the muffle in the high-temperature section, the muffle load can be limited by its own weight, which leads due to the associated lower strength requirements to a higher temperature resistance, which ensures the required final temperature of the treated metal bands. It is only to ensure a possible loss of heat transfer between the preheat and the high-temperature section over the connection plug. For this purpose, the connecting plug from the lower end of the muffle of the high-temperature section is externally enclosed, wherein a gas-tight connection between the connecting plug and muffle of the high-temperature section must be achieved, with the possibility of axial Muffelverschiebung opposite the connecting plug to compensate for thermal expansion of the muffle. For this purpose, a known liquid seal can be advantageously used. But it is also possible to achieve the gas-tight connection via a bellows-like sleeve between muffle and connecting plug. The heat-insulating, refractory material of the connection plug has a comparatively small volume, so that the flushing process is hardly affected by the connection plug. Since the connecting plug in the heat radiation is both the muffle of Vorwärmabschnittes and the muffle of the high-temperature section, it can be assumed that substantially continuous over the furnace length strip heating, which has an advantageous effect on the required overall length of the furnace.

Um eine durch den Anschlußstopfen möglichst unbehinderte Banderwärmung sicherzustellen, ist der Anschlußstopfen mit einem ausreichend großen Durchtrittsquerschnitt für die Metallbänder zu versehen, damit sich die Wärmestrahlungen der beiden Muffeln auch in den Bereich des Anschlußstopfens erstrecken können. Zu diesem Zweck kann der Anschlußstopfen einen Durchtrittsquerschnitt für das zu behandelnde Metallband mit einer dem halben Außenradius des Anschlußstopfens entsprechenden, senkrecht zum Metallband gemessenen Mindestbreite aufweisen.In order to ensure a band heating that is as unobstructed as possible by the connecting plug, the connecting plug must be provided with a sufficiently large passage cross section for the metal bands so that the thermal radiation of the two muffles can also extend into the region of the connecting plug. For this purpose, the connecting plug may have a passage cross-section for the metal strip to be treated with a minimum width measured perpendicular to the metal strip corresponding to half the outer radius of the connecting plug.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt. Es zeigen

Fig. 1
einen erfindungsgemäßen Turmofen zur Wärmebehandlung von Metallbändern ausschnittsweise in einem schematischen Längsschnitt und
Fig. 2
einen Schnitt durch den Anschlußstopfen nach der Linie II-II der Fig. 1 in einem größeren Maßstab.
In the drawing, the subject invention is shown, for example. Show it
Fig. 1
a tower furnace according to the invention for the heat treatment of metal strips fragmentary in a schematic longitudinal section and
Fig. 2
a section through the connecting plug according to the line II-II of Fig. 1 on a larger scale.

Der dargestellte Turmofen zur Wärmebehandlung von Metallbändern weist ein Gestell 1 auf, das ein Gehäuse 2 für einen Vorwärmabschnitt 3 und über dem Vorwärmabschnitt 3 ein Gehäuse 4 für einen Hochtemperaturabschnitt 5 trägt. Diese beiden Ofenabschnitte 3 und 5 sind miteinander durch einen Anschlußstopfen 6 aus einem wärmeisolierenden, feuerfesten Werkstoff verbunden. Der untere Vorwärmabschnitt 3 ist mit einer Muffel 7 versehen, die von oben in das Gehäuse 2 eingesetzt ist und auch wieder nach oben ausgebaut werden kann, wenn das Gehäuse 4 des Hochtemperaturabschnittes zu diesem Zweck im Ofengestell 1 seitlich versetzt wird. Zur Beheizung der Muffel 7 dienen übliche, aus Übersichtlichkeitsgründen nicht dargestellte Gasbrenner, mit deren Hilfe der Ringraum 8 zwischen der Muffel 7 und der feuerfesten Auskleidung 9 des Gehäuses 2 beheizt wird. Der untere Abschluß der Muffel 7 erfolgt über einen Stopfen 10 in herkömmlicher Weise, wobei zur gasdichten Verbindung zwischen Muffel 7 und Stopfen 10 eine Flüssigkeitsdichtung 11 in Form eines den Stopfen umschließenden Ringraumes vorgesehen ist, der mit einer Dichtflüssigkeit, z. B. Öl, gefüllt ist und in den das untere Ende der Muffel 7 ragt.The illustrated tower furnace for heat treatment of metal strips has a frame 1, which carries a housing 2 for a preheating section 3 and above the preheating section 3 a housing 4 for a high-temperature section 5. These two furnace sections 3 and 5 are through each other a connection plug 6 made of a heat-insulating, refractory material connected. The lower preheating section 3 is provided with a muffle 7, which is inserted from above into the housing 2 and can also be removed upwards again when the housing 4 of the high-temperature section is laterally offset in the furnace frame 1 for this purpose. For heating the muffle 7 are common, not shown for reasons of clarity gas burner, with the help of the annular space 8 between the muffle 7 and the refractory lining 9 of the housing 2 is heated. The lower end of the muffle 7 via a plug 10 in a conventional manner, wherein the gas-tight connection between muffle 7 and plug 10, a liquid seal 11 is provided in the form of a plug surrounding the annular space, which is filled with a sealing liquid, for. As oil, is filled and in which the lower end of the muffle 7 protrudes.

In ähnlicher Weise ist der Hochtemperaturabschnitt 5 des Turmofens ausgestaltet. Die von oben in das Gehäuse 4 eingesetzte Muffel 12 des Hochtemperaturabschnittes 5 umschließt mit ihrem unteren Ende den Anschlußstopfen 6, der an seiner Außenseite einen Ringraum 13 für eine Flüssigkeitsdichtung 14 trägt, so daß das untere Ende der Muffel 12 in das Bad der Flüssigkeitsdichtung 14 eintaucht. Damit ist ein gasdichter Anschluß der Muffel 12 an den Anschlußstopfen 6 sichergestellt, ohne einen Ausgleich von Wärmedehnungen der Muffel 12 zu behindern. Die Beheizung der Muffel 12 erfolgt vorteilhaft wiederum über Gasbrenner, deren in den Ringraum 15 zwischen Muffel 12 und Gehäuseauskleidung 16 strömende Rauchgase die Muffel 12 erwärmen.Similarly, the high temperature section 5 of the tower furnace is configured. The inserted from above into the housing 4 muffle 12 of the high-temperature section 5 encloses with its lower end the connecting plug 6, which carries on its outer side an annular space 13 for a liquid seal 14, so that the lower end of the muffle 12 is immersed in the bath of the liquid seal 14 , For a gas-tight connection of the muffle 12 is secured to the connection plug 6, without hindering compensation of thermal expansion of the muffle 12. The heating of the muffle 12 is advantageously carried out again via gas burners whose exhaust gases flowing into the annular space 15 between muffle 12 and housing lining 16 heat the muffle 12.

Aufgrund der Teilung des Turmofens in einen Vorwärmabschnitt 3 und einen Hochtemperaturabschnitt 5 kann trotz des jeweiligen Einsatzes einer Muffel 7 bzw. 12 die erforderliche Endtemperatur für die zu behandelnden Metallbänder erreicht werden, ohne eine Überlastung der Muffeln 7 und 12 befürchten zu müssen. Aufgrund der niedrigeren Temperatur im Vorwärmabschnitt 3 und der begrenzten Länge der Muffel 7 ergibt sich eine vorteilhafte Ausnützung der Werkstoffeigenschaften der Muffel 7, die beispielsweise eine Länge von 26 m aufweisen kann. Die Muffel 12 für den Hochtemperaturabschnitt 5 braucht im Falle des Ausführungsbeispieles lediglich eine Länge von 10 m zu betragen, um die gewünschte Bandendtemperatur von beispielsweise 1100 °C zu erreichen. Wegen der geringen Länge der Muffel 12 bleibt die Belastung durch das Eigengewicht gering, so daß wegen der damit verbundenen geringeren Festigkeitsanforderungen an den Werkstoff die Temperaturbelastung vergrößert werden kann. Im Vergleich dazu kann die Temperaturbelastung der Muffel 7 niedriger gehalten werden, was die Nutzung höherer Festigkeitswerte erlaubt. Dies bedeutet, daß die Muffel 7 mit einer Länge von 26 m bei dem eingesetzten Sonderstahl ein Gewicht von ca. 17 t hat, während das Gewicht der Muffel 12 mit einer Länge von 10 m ca. 7 t beträgt. Eine vergleichbare Muffel mit einer Gesamtlänge von 36 m würde ein Gewicht von ca. 33 t aufweisen. Es zeigt sich demnach, daß durch die erfindungsgemäße Ausbildung eine Gewichtseinsparung von fast 30 % möglich wird. Dazu kommt, daß wegen der Möglichkeit, die Muffeln 7 und 12 nacheinander einzeln auszubauen, die erforderliche Ausbauhöhe erheblich verringert werden kann. Während bei einer durchgehenden Muffel mit einer Länge von 36 m eine Ausbauhöhe von ca. 80 m erforderlich wird, beträgt die Ausbauhöhe gemäß der Erfindung lediglich 60 m, wenn für die Muffel 7 eine Länge von ca. 26 m und für die Muffel 12 von 10 m veranschlagt wird.Due to the division of the tower furnace into a preheating section 3 and a high-temperature section 5, the required final temperature for the metal strips to be treated can be achieved despite the respective use of a muffle 7 or 12, without having to fear an overload of the muffles 7 and 12. Due to the lower temperature in the preheating section 3 and the limited length of the muffle 7 results in an advantageous utilization of the material properties of the muffle 7, for example, a Length of 26 m may have. In the case of the exemplary embodiment, the muffle 12 for the high-temperature section 5 only needs to be 10 m in length in order to achieve the desired strip end temperature of, for example, 1100 ° C. Because of the small length of the muffle 12, the burden of its own weight remains low, so that because of the associated lower strength requirements of the material, the temperature load can be increased. In comparison, the temperature load of the muffle 7 can be kept lower, which allows the use of higher strength values. This means that the muffle 7 with a length of 26 m for the special steel used has a weight of about 17 t, while the weight of the muffle 12 with a length of 10 m is about 7 t. A comparable muffle with a total length of 36 m would have a weight of about 33 t. It turns out, therefore, that a weight saving of almost 30% is possible by the inventive design. In addition, because of the possibility of removing the muffles 7 and 12 one at a time, the required expansion height can be significantly reduced. While in a continuous muffle with a length of 36 m, an expansion height of about 80 m is required, the expansion height according to the invention is only 60 m, if for the muffle 7 has a length of about 26 m and for the muffle 12 of 10 m is estimated.

Um im Übergangsbereich zwischen dem Vorwärmabschnitt 3 und dem Hochtemperaturabschnitt 5 eine möglichst durchgehende Banderwärmung zu sichern, ist der Querschnitt des Durchtrittes 17 des Anschlußstopfens 6 für das zu behandelnde Metallband ausreichend groß zu wählen. Weist der Durchtrittsquerschnitt eine senkrecht zum Metallband gemessene Mindestbreite 18 auf, die dem halben Außenradius bzw. einem Viertel des Außendurchmessers des Anschlußstopfens 6 entspricht, wie dies der Fig. 2 entnommen werden kann, so ergeben sich hinsichtlich des Durchgriffes der Wärmestrahlung der Muffel 7 und 12 auf den Durchtritt 17 des Anschlußstopfens 6 vorteilhafte Verhältnisse, die sich günstig auf die Gesamtlänge des Turmofens auswirken.In order to ensure as continuous as possible band heating in the transition region between the preheating section 3 and the high-temperature section 5, the cross-section of the passage 17 of the connecting plug 6 for the metal strip to be treated is to be chosen to be sufficiently large. Has the passage cross-section a measured perpendicular to the metal strip minimum width 18, which corresponds to half the outer radius or a quarter of the outer diameter of the connecting plug 6, as the Fig. 2 can be removed, resulting in terms of the penetration of the heat radiation of the muffle 7 and 12 on the passage 17 of the connecting plug 6 advantageous conditions that have a favorable effect on the overall length of the tower furnace.

Claims (2)

  1. Tower-type furnace for heat-treating metal strips having a pre-heating section (3) and a high-temperature section (5) which is connected to it at the top and forms a housing (4) which is separate from the pre-heating section (3), wherein the pre-heating section (3), which is fitted with a preferably gas-heated muffle (7), has a connection stopper (6) which is inserted at the top into the muffle (7) and is made from heat-insulating material for the high-temperature section (5), characterised in that the high-temperature section (5) is also provided with a preferably gas-heated muffle (12) which surrounds the connection stopper (6) on the outside and is connected thereto in a gas-tight manner preferably via a liquid seal (14).
  2. Tower-type furnace as claimed in claim 1, characterised in that the connection stopper (6) has a through cross-section for the metal strip to be treated, having a minimum width (18), measured perpendicular to the metal strip, corresponding to half the outer radius of the connection stopper (6).
EP01890160A 2000-06-29 2001-05-25 Tower-type furnace for heat treating of metal strip Expired - Lifetime EP1167554B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0111300A AT408452B (en) 2000-06-29 2000-06-29 TOWER STOVES FOR THE HEAT TREATMENT OF METAL STRIPS
AT11132000 2000-06-29

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EP1167554A2 EP1167554A2 (en) 2002-01-02
EP1167554A3 EP1167554A3 (en) 2004-01-02
EP1167554B1 true EP1167554B1 (en) 2008-03-12

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EP01890160A Expired - Lifetime EP1167554B1 (en) 2000-06-29 2001-05-25 Tower-type furnace for heat treating of metal strip

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US (1) US6425756B2 (en)
EP (1) EP1167554B1 (en)
JP (1) JP4856326B2 (en)
KR (1) KR100791664B1 (en)
AT (2) AT408452B (en)
BR (1) BR0102591B1 (en)
CA (1) CA2349693C (en)
CZ (1) CZ300367B6 (en)
DE (1) DE50113716D1 (en)
ES (1) ES2303523T3 (en)
RU (1) RU2249631C2 (en)
TW (1) TWI232886B (en)
UA (1) UA74329C2 (en)
ZA (1) ZA200104662B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT507670B1 (en) 2009-07-03 2010-07-15 Ebner Ind Ofenbau TOWER FOR THE HEAT TREATMENT OF A METAL STRIP
DE102016222644A1 (en) * 2016-03-14 2017-09-28 Sms Group Gmbh Process for rolling and / or heat treating a metallic product

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1485118A (en) * 1921-01-28 1924-02-26 Norton Co Muffle tunnel kiln
US2218354A (en) * 1939-03-13 1940-10-15 Wean Engineering Co Inc Method and apparatus for annealing strip
US2823292A (en) * 1956-07-31 1958-02-11 Heberlein Patent Corp Device for the continuous heat treatment of textile yarns
US3721520A (en) * 1971-09-02 1973-03-20 Selas Corp Of America Galvanizing wire
SE7707127L (en) * 1977-06-20 1978-12-21 Bulten Kanthal Ab DEVICE FOR GLADING OF WIRE, BAND AND BAR SHAPE
US4398474A (en) * 1979-02-09 1983-08-16 Pyreflex Corporation Insulating structure for high temperature devices
JPS6317381A (en) * 1986-07-09 1988-01-25 東邦レーヨン株式会社 Carbonating furnace
JPH04210431A (en) * 1990-11-30 1992-07-31 San Furness Kk Heating furnace of vertical annealing furnace
JP3275919B2 (en) * 1990-12-26 2002-04-22 大同特殊鋼株式会社 Vertical furnace
JP3093864B2 (en) * 1992-04-20 2000-10-03 日新製鋼株式会社 Vertical heat treatment furnace with muffle
JP3356864B2 (en) * 1994-03-31 2002-12-16 中外炉工業株式会社 Heating zone of vertical continuous bright annealing furnace for steel strip
NL1002856C2 (en) * 1996-04-12 1997-10-15 Thermtec B V Vertical annealing furnace for a belt treatment installation.
AT405055B (en) * 1997-06-10 1999-05-25 Ebner Peter Dipl Ing TOWER STOVES FOR THE HEAT TREATMENT OF METAL STRIPS

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US20020000180A1 (en) 2002-01-03
ATE389037T1 (en) 2008-03-15
ES2303523T3 (en) 2008-08-16
EP1167554A3 (en) 2004-01-02
UA74329C2 (en) 2005-12-15
JP2002054879A (en) 2002-02-20
JP4856326B2 (en) 2012-01-18
KR100791664B1 (en) 2008-01-03
EP1167554A2 (en) 2002-01-02
KR20020002256A (en) 2002-01-09
BR0102591B1 (en) 2010-08-10
CA2349693A1 (en) 2001-12-29
CA2349693C (en) 2009-12-08
RU2249631C2 (en) 2005-04-10
ATA11132000A (en) 2001-04-15
AT408452B (en) 2001-12-27
CZ20012427A3 (en) 2002-03-13
BR0102591A (en) 2002-02-19
US6425756B2 (en) 2002-07-30
DE50113716D1 (en) 2008-04-24
TWI232886B (en) 2005-05-21
CZ300367B6 (en) 2009-05-06
ZA200104662B (en) 2001-12-14

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