EP1167554A2 - Tower-type furnace for heat treating of metal strip - Google Patents
Tower-type furnace for heat treating of metal strip Download PDFInfo
- Publication number
- EP1167554A2 EP1167554A2 EP01890160A EP01890160A EP1167554A2 EP 1167554 A2 EP1167554 A2 EP 1167554A2 EP 01890160 A EP01890160 A EP 01890160A EP 01890160 A EP01890160 A EP 01890160A EP 1167554 A2 EP1167554 A2 EP 1167554A2
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- EP
- European Patent Office
- Prior art keywords
- muffle
- section
- temperature section
- high temperature
- metal strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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 one upwards subsequent, forming a separate housing from the preheating section High temperature section, the one with a preferably gas-heated Muffle-equipped preheating section inserted into the top of the muffle Connection plug made of heat-insulating material for the high temperature section having.
- Metal strips in particular made of chrome or chrome-nickel steel are made of hydrogen or a hydrogen-nitrogen mixture in a protective gas atmosphere continuously annealed in so-called door furnaces, that can be designed with a muffle or muffle-free.
- the heat treatment of metal bands over a muffle heated from the outside brings the Advantage with itself that gas burners can be used without the Flue gases affect the protective gas atmosphere inside the muffle.
- the furnace temperature is limited by the heat resistance of the muffle.
- Muffle-free door stoves have a fire-resistant lining and are electrically heated, so that higher oven temperatures can be reached.
- the refractory furnace lining is porous, it takes on opening ambient air, for example with a nitrogen gas must be rinsed out before a trouble-free heat treatment the metal strips can be secured under a protective gas atmosphere. Because of the necessary rinsing times, muffle-free door ovens are behind open again after several days. Also poses there is a high consumption of hydrogen, because the after flushing is still existing rest of atmospheric oxygen with the hydrogen of the protective gas Water connects.
- the muffle High temperature section can be a lower one advantageous for muffle use
- Purchase temperature of the band to be treated from the muffle be taken so that by the heat and weight loads
- the restrictions given to the muffle do not affect the result of the heat treatment or can affect throughput.
- the disadvantage is however, that the muffle-free high-temperature section with its refractory Lining a significantly longer rinsing time compared to muffle furnaces after opening the furnace with a correspondingly increased hydrogen consumption conditionally.
- the area of the high temperature section on the economically more advantageous gas heating in favor of one complex electrical heating must be dispensed with.
- the invention is therefore based on the object of a tower furnace To design heat treatment of metal strips of the type described at the beginning, that despite the heat and weight of the muffle given the required strip end temperature can without the use of a muffle-free high temperature section associated disadvantages.
- the invention achieves the object in that the high temperature section also provided with a preferably gas-heated muffle is, which surrounds the connector plug on the outside and preferably on this gas-tight connection via a liquid seal.
- the high temperature section also has a muffle, the advantages of a high temperature section Muffle especially with regard to the flushing and the possible gas heating be used to advantage.
- the muffle load can be caused by the dead weight be limited, which due to the associated lower strength requirements leads to a higher temperature resistance, which the ensures the required final temperature of the metal strips to be treated. It is only for a heat loss-free transition between the preheating and to provide the high temperature section over the plug.
- the connector plug from the lower end of the muffle of the high-temperature section enclosed on the outside, a gas-tight Connection between connector and muffle of the high temperature section must be achieved, with the possibility of an axial muffle displacement compared to the plug to compensate for thermal expansion the muffle.
- a known one can advantageously be used Liquid seal can be used.
- gas-tight Connection via a bellows-like sleeve between the muffle and the plug to reach.
- the heat insulating, fireproof material of Connection plug has a comparatively small volume, so that the Rinsing process is hardly affected by the plug. Because the connector in the area of heat radiation both the muffle of the preheating section as well as the muffle of the high temperature section, can be from continuous belt heating essentially over the length of the furnace be assumed, which is advantageous to the required total length of the furnace.
- connection plug In order to prevent unhindered band heating by the connecting plug ensure that the connection plug is sufficient with a to provide a large passage cross section for the metal strips so that the Heat radiation from the two muffles also in the area of the connection plug can extend.
- the connector plug can Passage cross section for the metal strip to be treated with one half Corresponding outer radius of the plug, perpendicular to the metal band have measured minimum width.
- the tower furnace shown for the heat treatment of metal strips has a frame 1 which has a housing 2 for a preheating section 3 and a housing 4 for a high-temperature section above the preheating section 3 5 carries. These two furnace sections 3 and 5 are through with each other a connector plug 6 made of a heat-insulating, refractory material connected.
- the lower preheating section 3 is provided with a muffle 7 is inserted from above into the housing 2 and also removed again upwards can be when the housing 4 of the high temperature section too this purpose is laterally offset in the oven frame 1.
- For heating the muffle 7 serve conventional gas burners, not shown for reasons of clarity, 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 takes place via a stopper 10 in a conventional manner, with gas-tight Connection between muffle 7 and stopper 10 a liquid seal 11 in Form of an annular space surrounding the stopper is provided, which with a sealing liquid, e.g. B. oil, is filled and in the lower end of the muffle 7 protrudes.
- a sealing liquid e.g. B. oil
- the high temperature section 5 of the tower furnace designed.
- the muffle 12 inserted into the housing 4 from above High-temperature section 5 encloses the connector plug with its lower end 6, on the outside of an annular space 13 for a liquid seal 14 carries so that the lower end of the muffle 12 in the bathroom of Liquid seal 14 immersed.
- This is a gas-tight connection of the muffle 12 to the plug 6 ensured without compensation for thermal expansion to hinder the muffle 12.
- the muffle 12 is heated again advantageously via gas burners, whose in the annular space 15 between Muffle 12 and housing lining 16 flowing smoke gases the muffle 12 heat.
- the required final temperature for the to be treated Metal straps can be reached without overloading the muffles 7 and 12 to fear.
- Due to the lower temperature in the preheating section 3 and the limited length of the muffle 7 results in an advantageous Exploitation of the material properties of the muffle 7, for example a Can have a length of 26 m.
- the muffle 12 for the high temperature section 5 only needs a length of in the case of the exemplary embodiment To be 10 m, for example, the desired end band temperature To reach 1100 ° C.
- the muffle 7 Because of the short length of the muffle 12, the Low weight burden, so because of the associated lower strength requirements for the material the temperature load can be enlarged. In comparison, the temperature load the muffle 7 can be kept lower, resulting in the use of higher strength values allowed. This means that the muffle 7 with a length of 26 m has a weight of approx. 17 t for the special steel used, while the Weight of the muffle 12 with a length of 10 m is approximately 7 t. A comparable one Muffle with a total length of 36 m would have a weight of approx. 33 t exhibit. It turns out accordingly that through the training according to the invention a weight saving of almost 30% is possible.
- the required installation height can be significantly reduced. While for a continuous muffle with a length of 36 m, an expansion height 80 m is required, the expansion height according to the invention only 60 m if the muffle 7 has a length of approx. 26 m and the muffle 12 of 10 m is estimated.
- the cross section of the passage 17 of the connector plug 6 for the choose a sufficiently large metal band to be treated.
- a minimum width 18 measured perpendicular to the metal strip which is half the outer radius or a quarter of the outer diameter corresponds to the connector plug 6, as can be seen in FIG. 2 can result in the penetration of the heat radiation Muffle 7 and 12 on the passage 17 of the connector 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
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 one upwards subsequent, forming a separate housing from the preheating section High temperature section, the one with a preferably gas-heated Muffle-equipped preheating section inserted into the top of the muffle Connection plug made of heat-insulating material for the high temperature section having.
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 made of chrome or chrome-nickel steel are made of hydrogen or a hydrogen-nitrogen mixture in a protective gas atmosphere continuously annealed in so-called door furnaces, that can be designed with a muffle or muffle-free. The heat treatment of metal bands over a muffle heated from the outside brings the Advantage with itself that gas burners can be used without the Flue gases affect the protective gas atmosphere inside the muffle. The However, the furnace temperature is limited by the heat resistance of the muffle. Added to this is that due to the transfer from the muffle to the metal strip Amount of heat the muffle length the achievable throughput speed of the metal strip to be treated, so that the in the area of their Muffle clamped in the upper end in addition to the thermal load and the load is exposed by its own weight, which despite a in the longitudinal direction of the muffle from the bottom up increasing wall thickness to a limitation the muffle length due to its own weight. In this context is the reduced strength of the high temperature loads special steel used for the muffle.
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.Muffle-free door stoves have a fire-resistant lining and are electrically heated, so that higher oven temperatures can be reached. However, since the refractory furnace lining is porous, it takes on opening ambient air, for example with a nitrogen gas must be rinsed out before a trouble-free heat treatment the metal strips can be secured under a protective gas atmosphere. Because of the necessary rinsing times, muffle-free door ovens are behind open again after several days. Also poses there is a high consumption of hydrogen, because the after flushing is still existing rest of atmospheric oxygen with the hydrogen of the protective gas Water connects.
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.To despite the restrictions associated with a muffle insert It is to achieve a high throughput of the metal strips to be treated known (EP 0 675 208 A1) to the preheating section provided with a muffle a muffle-free high-temperature section of a tower furnace connect, which forms a separate housing from the preheating section, which is placed on the housing of the preheating section. The one to be treated Metal tape emerges from the muffle of the preheating section Plug made of heat-insulating material inserted into the muffle at the top Material in the high temperature section where using the electrical Heater is heated to the required final temperature before it enters an cooler placed on top of the tower furnace. Because of the muffle High temperature section can be a lower one advantageous for muffle use Purchase temperature of the band to be treated from the muffle be taken so that by the heat and weight loads The restrictions given to the muffle do not affect the result of the heat treatment or can affect throughput. The disadvantage is however, that the muffle-free high-temperature section with its refractory Lining a significantly longer rinsing time compared to muffle furnaces after opening the furnace with a correspondingly increased hydrogen consumption conditionally. In addition, in the area of the high temperature section on the economically more advantageous gas heating in favor of one complex electrical heating must be dispensed with.
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 of a tower furnace To design heat treatment of metal strips of the type described at the beginning, that despite the heat and weight of the muffle given the required strip end temperature can without the use of a muffle-free high temperature section associated 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 achieves the object in that the high temperature section also provided with a preferably gas-heated muffle is, which surrounds the connector plug on the outside and preferably on this gas-tight connection 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.Because of these measures, the high temperature section also has a muffle, the advantages of a high temperature section Muffle especially with regard to the flushing and the possible gas heating be used to advantage. Because of the limitation of the length of the muffle in the high-temperature section, the muffle load can be caused by the dead weight be limited, which due to the associated lower strength requirements leads to a higher temperature resistance, which the ensures the required final temperature of the metal strips to be treated. It is only for a heat loss-free transition between the preheating and to provide the high temperature section over the plug. For this purpose, the connector plug from the lower end of the muffle of the high-temperature section enclosed on the outside, a gas-tight Connection between connector and muffle of the high temperature section must be achieved, with the possibility of an axial muffle displacement compared to the plug to compensate for thermal expansion the muffle. For this purpose, a known one can advantageously be used Liquid seal can be used. But it is also possible to use gas-tight Connection via a bellows-like sleeve between the muffle and the plug to reach. The heat insulating, fireproof material of Connection plug has a comparatively small volume, so that the Rinsing process is hardly affected by the plug. Because the connector in the area of heat radiation both the muffle of the preheating section as well as the muffle of the high temperature section, can be from continuous belt heating essentially over the length of the furnace be assumed, which is advantageous to the required total 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 prevent unhindered band heating by the connecting plug ensure that the connection plug is sufficient with a to provide a large passage cross section for the metal strips so that the Heat radiation from the two muffles also in the area of the connection plug can extend. For this purpose, the connector plug can Passage cross section for the metal strip to be treated with one half Corresponding outer radius of the plug, perpendicular to the metal band have measured minimum width.
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.
- Fig. 1
- a tower furnace according to the invention for the heat treatment of metal strips in sections in a schematic longitudinal section and
- Fig. 2
- a section through the plug along 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 tower furnace shown for the heat treatment of metal strips
has a
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
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
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.To in the transition area between the preheating section 3 and
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT11132000 | 2000-06-29 | ||
| AT0111300A AT408452B (en) | 2000-06-29 | 2000-06-29 | TOWER STOVES FOR THE HEAT TREATMENT OF METAL STRIPS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1167554A2 true EP1167554A2 (en) | 2002-01-02 |
| EP1167554A3 EP1167554A3 (en) | 2004-01-02 |
| EP1167554B1 EP1167554B1 (en) | 2008-03-12 |
Family
ID=3685686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01890160A Expired - Lifetime EP1167554B1 (en) | 2000-06-29 | 2001-05-25 | Tower-type furnace for heat treating of metal strip |
Country Status (14)
| Country | Link |
|---|---|
| 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) |
Families Citing this family (2)
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04210431A (en) * | 1990-11-30 | 1992-07-31 | San Furness Kk | Heating furnace of vertical annealing furnace |
| EP0675208A1 (en) * | 1994-03-31 | 1995-10-04 | Chugai Ro Co., Ltd. | A vertical bright annealing furnace for continuous heat treatment of metal strips |
| WO1997039154A1 (en) * | 1996-04-12 | 1997-10-23 | Thermtec B.V. | Vertical annealing furnace for a strip treatment device |
| EP0897017A1 (en) * | 1997-06-10 | 1999-02-17 | Peter Helmut Dipl.-Ing. Ebner | Tower furnace for heat treatment of metal strips |
Family Cites Families (9)
| 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 |
| 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 |
-
2000
- 2000-06-29 AT AT0111300A patent/AT408452B/en not_active IP Right Cessation
-
2001
- 2001-05-25 DE DE50113716T patent/DE50113716D1/en not_active Expired - Fee Related
- 2001-05-25 ES ES01890160T patent/ES2303523T3/en not_active Expired - Lifetime
- 2001-05-25 EP EP01890160A patent/EP1167554B1/en not_active Expired - Lifetime
- 2001-05-25 AT AT01890160T patent/ATE389037T1/en not_active IP Right Cessation
- 2001-05-31 TW TW090113226A patent/TWI232886B/en not_active IP Right Cessation
- 2001-06-04 CA CA002349693A patent/CA2349693C/en not_active Expired - Fee Related
- 2001-06-07 ZA ZA200104662A patent/ZA200104662B/en unknown
- 2001-06-21 US US09/886,719 patent/US6425756B2/en not_active Expired - Fee Related
- 2001-06-26 UA UA2001064483A patent/UA74329C2/en unknown
- 2001-06-28 RU RU2001118220/02A patent/RU2249631C2/en not_active IP Right Cessation
- 2001-06-28 BR BRPI0102591-0A patent/BR0102591B1/en not_active IP Right Cessation
- 2001-06-28 KR KR1020010037269A patent/KR100791664B1/en not_active IP Right Cessation
- 2001-06-29 JP JP2001199869A patent/JP4856326B2/en not_active Expired - Fee Related
- 2001-06-29 CZ CZ20012427A patent/CZ300367B6/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04210431A (en) * | 1990-11-30 | 1992-07-31 | San Furness Kk | Heating furnace of vertical annealing furnace |
| EP0675208A1 (en) * | 1994-03-31 | 1995-10-04 | Chugai Ro Co., Ltd. | A vertical bright annealing furnace for continuous heat treatment of metal strips |
| WO1997039154A1 (en) * | 1996-04-12 | 1997-10-23 | Thermtec B.V. | Vertical annealing furnace for a strip treatment device |
| EP0897017A1 (en) * | 1997-06-10 | 1999-02-17 | Peter Helmut Dipl.-Ing. Ebner | Tower furnace for heat treatment of metal strips |
Non-Patent Citations (2)
| Title |
|---|
| HONERVOGT H W: "EINE INDIREKT BEHEIZTE GLUEHANLAGE FUER DAS GLUEHEN VON NICHTROSTENDEN UND SAEUREBESTAENDIGEN KALTBAENDERN UNTER SCHUTZGAS.AN INDIRECT HEATED ANNEALING FURNACE FOR STAINLESS AND ACID-RESISTANT COLD STRIP WITH PROTECTIVE GAS ATMOSPHERE" STAHL UND EISEN, VERLAG STAHLEISEN GMBH. DUSSELDORF, DE, Bd. 93, Nr. 24, 22. November 1973 (1973-11-22), Seiten 1152-1157, XP000673714 ISSN: 0340-4803 * |
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 552 (C-1006), 20. November 1992 (1992-11-20) & JP 04 210431 A (SAN FUAANESU KK), 31. Juli 1992 (1992-07-31) * |
Also Published As
| Publication number | Publication date |
|---|---|
| AT408452B (en) | 2001-12-27 |
| KR100791664B1 (en) | 2008-01-03 |
| ATA11132000A (en) | 2001-04-15 |
| CA2349693C (en) | 2009-12-08 |
| CZ20012427A3 (en) | 2002-03-13 |
| BR0102591A (en) | 2002-02-19 |
| JP2002054879A (en) | 2002-02-20 |
| JP4856326B2 (en) | 2012-01-18 |
| BR0102591B1 (en) | 2010-08-10 |
| TWI232886B (en) | 2005-05-21 |
| US6425756B2 (en) | 2002-07-30 |
| ATE389037T1 (en) | 2008-03-15 |
| EP1167554A3 (en) | 2004-01-02 |
| ES2303523T3 (en) | 2008-08-16 |
| EP1167554B1 (en) | 2008-03-12 |
| KR20020002256A (en) | 2002-01-09 |
| DE50113716D1 (en) | 2008-04-24 |
| US20020000180A1 (en) | 2002-01-03 |
| CZ300367B6 (en) | 2009-05-06 |
| CA2349693A1 (en) | 2001-12-29 |
| UA74329C2 (en) | 2005-12-15 |
| RU2249631C2 (en) | 2005-04-10 |
| ZA200104662B (en) | 2001-12-14 |
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