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EP0183920A2 - Running process of a reheating furnace, and reheating furnace for billets, blocks or the like - Google Patents

Running process of a reheating furnace, and reheating furnace for billets, blocks or the like Download PDF

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Publication number
EP0183920A2
EP0183920A2 EP85110663A EP85110663A EP0183920A2 EP 0183920 A2 EP0183920 A2 EP 0183920A2 EP 85110663 A EP85110663 A EP 85110663A EP 85110663 A EP85110663 A EP 85110663A EP 0183920 A2 EP0183920 A2 EP 0183920A2
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EP
European Patent Office
Prior art keywords
furnace
hot
gases
heating
mixing chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP85110663A
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German (de)
French (fr)
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EP0183920A3 (en
Inventor
Heinrich Dipl.-Ing. Patalon
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Didier Engineering GmbH
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Didier Engineering GmbH
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Publication date
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Publication of EP0183920A2 publication Critical patent/EP0183920A2/en
Publication of EP0183920A3 publication Critical patent/EP0183920A3/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/3005—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B2009/305—Particular conformation of the furnace
    • F27B2009/3055—Non-uniform section through the length of the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F27B2009/3607—Heaters located above the track of the charge
    • F27B2009/3615—Burner in the ceiling directed vertically downwards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F27B2009/382—Charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
    • F27M2001/1539—Metallic articles
    • F27M2001/1547—Elongated articles, e.g. beams, rails
    • F27M2001/1552—Billets, slabs

Definitions

  • the invention relates to a method for operating a reheating furnace according to the preamble of the main claim and to a reheating furnace for slabs, blocks or the like according to the preamble of claim 5.
  • Modern reheating furnaces must therefore be matched to this cooperative heating and operating sequence in terms of their process engineering and construction. In such modern reheating furnaces, it should be possible to heat cold heating material and heating and equalization of the temperature of hot material with temperatures from 1100 to 1260 ° C. Furthermore, there should be sufficient and quickly usable storage space to reduce the production influence of downtimes.
  • the heating of hot material with temperatures of 1100 to 1260 ° C mostly focuses only on the edges and marginal zones, since these areas are subject to increased cooling on the way from the continuous caster to the heating furnace.
  • the invention has for its object to provide a reheating furnace, which allows an individual hot gas control depending on the heat, but at the same time has an integrated in the heating system, sufficiently large storage zone to act as a buffer zone and so as to influence the production of Reduce downtimes.
  • the furnace according to the invention it is possible to heat cold material which is only present in a proportion of 10% of the products. At the same time the heating can be done from medium-warm material at temperatures from 400 to 1110 ° C, and finally it is possible to achieve the heating and the compensation of material with temperatures 1100 to 1260 o C.
  • 1 denotes a heating furnace designed as a walking beam furnace, in which a corresponding walking beam conveyor device is provided for the actual heating material 2.
  • the heating material 2 is fed to the heating furnace 1 on the feed side via a charging machine 4, the feed side being able to be closed by a corresponding door 17.
  • the charging machine 4 can in Wasserge Drive in cooled raceways 3 of the furnace, this area being referred to as storage zone 5, which results in a storage space which can store approximately 50% or more of the hourly furnace reference power.
  • the water-cooled raceways 3, which, with the interposition of the impellers, support the charging machine 4, permit a considerable extension of the storage zone 5 known per se.
  • an exhaust manifold 6 On the top of the heating furnace 1 and on the back of the same, an exhaust manifold 6 is provided. 7 designates a hot gas fan, which is arranged, for example with respect to the path of the exhaust gases, behind a recuperator and which, via a corresponding line 18, feeds the gases withdrawn from the exhaust gas manifold 6 to a mixing chamber 8, into which the schematically indicated burners 9 open.
  • the mixing chamber 8 is equipped with a hot gas outflow opening 11 which leads to the furnace interior 10.
  • the hot gas outflow opening 11 is connected to one or more hot gas channels 13 which have outflow openings 12 which then open into the furnace chamber 10.
  • the hot material 2 located in the furnace chamber 10 is washed around by the hot gases and heated to be ready for rolling.
  • the hot gas temperature is always set in such a way that, compared to the maximum temperature of the material to be heated, there is only a slight temperature difference outside the more cooled edge zones, which is not sufficient to overheat those parts of the heat material which have a significantly higher temperature than the edge zones.
  • a hot gas temperature of 1260 - 1270 ° C is set at a surface temperature of the material to be heated outside the peripheral zones of 1250 ° C. This prevents harmful overheating.
  • the cooled peripheral zones of the material to be heated are heated to approximately 1250 ° C. in technically justifiable reheating times, FIG. 4 showing a corresponding temperature distribution.
  • a cooling device 15 can also be provided between the exhaust gas manifold 6 and the hot gas fan 7, and the cooling medium, for example air, is only applied to it when the maximum limit temperature of the recirculated exhaust gases, for example 700 ° C., is reached.
  • the cooling medium for example air
  • the furnace is equipped with two exhaust manifolds 6, which are arranged next to one another at a certain distance.
  • the first exhaust manifold in the direction of the feed-removal side could then only be used by the hot gas fan 7 for the return, while the second exhaust manifold could work on the recuperator and the chimney.
  • the system is also suitable for heating cold or medium-warm material.
  • the lower furnace is also heated by the hot gas channels 13.
  • the exhaust gas quantity recirculation is then largely throttled or switched off completely to increase the hot gas temperature.
  • burners 16 can be switched on at the upper furnace, so that a corresponding Lei performance increase of the entire heating system is achievable.
  • the burners 9 and 16 are generally not connected to the exhaust gas recirculation system, although direct exposure of each burner to recirculated exhaust gases would also be possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Tunnel Furnaces (AREA)

Abstract

Die Erfindung bezieht sich auf ein Verfahren zum Betreiben eines Nachwärmofens für Brammen. Blöcke od. dgl. mit einer Förderung des Wärmgutes durch den mit Heißgasen betriebenen Ofen, wobei ein variabler Abgasanteil aus dem Ofen in eine Mischkammer zurückgeführt wird, in die die Heizbrenner münden und in der Mischkammer eine Regelung der Heißgasmenge und Heißgastemperatur der in den eigentlichen Ofenraum eingeführten Heißgase derart erfolgt, daß die Temperatur der Heißgase nur eine geringe Differenz gegenüber der maximalen Wärmguttemperatur aufweist und der eigentliche Ofen im Bereich seiner Speicherzone Laufbahnen für die Chargiermaschine aufweist.

Figure imgaf001
The invention relates to a method for operating a reheating furnace for slabs. Blocks or the like with a conveyance of the heating material through the furnace operated with hot gases, a variable portion of the exhaust gas being returned from the furnace into a mixing chamber into which the heating burners open and in the mixing chamber a regulation of the quantity of hot gas and the temperature of the hot gas in the actual furnace space imported hot gases takes place in such a way that the temperature of the hot gases has only a slight difference compared to the maximum temperature of the hot material and the actual furnace has tracks for the charging machine in the region of its storage zone.
Figure imgaf001

Description

Die Erfindung bezieht sich auf ein Verfahren zum Betreiben eines Nachwärmofens entsprechend dem Oberbegriff des Hauptanspruches und auf einen Nachwärmofen für Brammen, Blöcke od. dgl. entsprechend dem Oberbegriff des Anspruches 5.The invention relates to a method for operating a reheating furnace according to the preamble of the main claim and to a reheating furnace for slabs, blocks or the like according to the preamble of claim 5.

In der Stahlindustrie ist es ein Bestreben, den Betrieb der Stranggießanlagen immer mehr mit dem Betrieb der Walzstraßen abzustimmen. Durch diese Maßnahme soll erreicht werden, daß die Brammen oder Blöcke entweder direkt verwalzt oder möglichst warm in die Nachwärmöfen einlaufen. Hierdurch lassen sich die Energiekosten für die walzreife Erwärmung beträchtlich reduzieren.In the steel industry, efforts are being made to coordinate the operation of the continuous casting plants more and more with the operation of the rolling mills. This measure is intended to ensure that the slabs or blocks are either directly rolled or run as warm as possible into the reheating furnaces. As a result, the energy costs for heating ready for rolling can be reduced considerably.

Moderne Nachwärmöfen müssen deshalb auf diesen kooperativen Erwärmungs- und Betriebsablauf in ihrer verfahrenstechnischen und konstruktiven Konzeption abgestimmt werden. In solchen modernen Nachwärmöfen soll eine Erwärmung von kaltem Wärmgut möglich sein und eine Erwärmung und ein Ausgleich der Temperatur von Wärmgut mit Temperaturen von 1100 bis 1260° C. Weiterhin sollte eine ausreichende und schnell belegbare Speicherfläche vorhanden sein, um den Produktionseinfluß von Störzeiten zu vermindern.Modern reheating furnaces must therefore be matched to this cooperative heating and operating sequence in terms of their process engineering and construction. In such modern reheating furnaces, it should be possible to heat cold heating material and heating and equalization of the temperature of hot material with temperatures from 1100 to 1260 ° C. Furthermore, there should be sufficient and quickly usable storage space to reduce the production influence of downtimes.

Hierbei konzentriert sich das Erwärmen von Wärmgut mit Temperaturen von 1100 bis 1260° C meist nur auf die Kanten und Randzonen, da diese Gebiete auf dem Weg von der Stranggießanlage zum Wärmofen einer verstärkten Abkühlung unterliegen.The heating of hot material with temperatures of 1100 to 1260 ° C mostly focuses only on the edges and marginal zones, since these areas are subject to increased cooling on the way from the continuous caster to the heating furnace.

Bei Brammen hat zum Beispiel jener Teil außerhalb der Randzonen bereits Temperaturen, die für den Walzvorgang ausreichen oder darüberliegen und es ist eine abgestimmte Erwärmung für diesen Teil erforderlich, um auf diese Weise überhitzungen zu vermeiden.In the case of slabs, for example, that part outside the edge zones already has temperatures which are sufficient for the rolling process or are above it, and coordinated heating is required for this part in order to avoid overheating in this way.

Der Erfindung liegt die Aufgabe zugrunde, einen Nachwärmofen zu schaffen, der in Abhängigkeit des jeweils vorhandenen Wärmgutes eine individuelle Heißgassteuerung ermöglicht, der dabei gleichzeitig aber eine in das Heizsystem integrierte, ausreichend große Speicherzone besitzt, um als Pufferzone zu wirken und um derart den Produktionseinfluß von Störzeiten zu vermindern.The invention has for its object to provide a reheating furnace, which allows an individual hot gas control depending on the heat, but at the same time has an integrated in the heating system, sufficiently large storage zone to act as a buffer zone and so as to influence the production of Reduce downtimes.

Diese der Erfindung zugrundeliegende Aufgabe wird durch die Lehre des kennzeichnenden-Teiles des Hauptanspruches und durch die Lehre des kennzeichnenden Teiles des Anspruches 5 gelöst.This object on which the invention is based is achieved by the teaching of the characterizing part of the main claim and by the teaching of the characterizing part of claim 5.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen erläutert.Advantageous embodiments of the invention are explained in the subclaims.

Mit dem erfindungsgemäßen Ofen ist es möglich, kaltes Material zu erwärmen, das nur in einem Anteil von 10 % der Produkte vorliegt. Gleichzeitig kann die Erwärmung von mittelwarmem Material mit Temperaturen von 400 bis 1110° C erfolgen und schließlich ist es möglich, die Erwärmung und den Ausgleich von Material mit Temperaturen von 1100 bis 1260o C zu erreichen.With the furnace according to the invention it is possible to heat cold material which is only present in a proportion of 10% of the products. At the same time the heating can be done from medium-warm material at temperatures from 400 to 1110 ° C, and finally it is possible to achieve the heating and the compensation of material with temperatures 1100 to 1260 o C.

Ein Ausführungsbeispiel eines erfindungsgemäßen Ofens wird nachfolgend anhand der Zeichnungen erläutert.An embodiment of an oven according to the invention is explained below with reference to the drawings.

In den Zeichnungen zeigt

  • Fig. 1 einen schematischen Längsschnitt durch einen Hubbalkenofen, in
  • Fig. 2 einen Querschnitt durch den Ofen gemäß Fig. 1, in
  • Fig. 3 einen Querschnitt durch die Speicherzone des Ofens, in
  • Fig. 4 eine Temperaturverteilung in einer Bramme mit eingezeichneten Isothermen und in
  • Fig. 5 eine schaubildliche Darstellung des Ofens gemäß Fig. 2 im Schnitt gemäß der Linie 5 - 5 in Fig. 2.
In the drawings shows
  • Fig. 1 shows a schematic longitudinal section through a walking beam furnace, in
  • Fig. 2 shows a cross section through the furnace of FIG. 1, in
  • Fig. 3 shows a cross section through the storage zone of the furnace, in
  • Fig. 4 shows a temperature distribution in a slab with isotherms and in
  • 5 shows a diagrammatic representation of the furnace according to FIG. 2 in section along the line 5 - 5 in FIG. 2.

In den Zeichnungen ist mit 1 ein als Hubbalkenofen ausgebildeter Wärmofen bezeichnet, in dem eine entsprechende Hubbalkenfördereinrichtung für das eigentliche Wärmgut 2 vorgesehen ist. Das Wärmgut 2 wird über eine Chargiermaschine 4 dem Wärmofen 1 an der Aufgabeseite zugeführt, wobei die Aufgabeseite durch eine entsprechende Tür 17 verschlossen werden kann. Die Chargiermaschine 4 kann dabei in wassergekühlte Laufbahnen 3 des Ofens einfahren, wobei dieser Bereich als Speicherzone 5 bezeichnet wird, die einen Speicherplatz ergibt, der ca. 50 % oder mehr der stündlichen Ofenreferenzleistung speichern kann. Die wassergekühlten Laufbahnen 3, die unter Zwischenschaltung der Laufräder eine Abstützung der Chargiermaschine 4 bewirken, ermöglichen eine beträchtliche Verlängerung der an sich bisher bekannten Speicherzone 5.In the drawings, 1 denotes a heating furnace designed as a walking beam furnace, in which a corresponding walking beam conveyor device is provided for the actual heating material 2. The heating material 2 is fed to the heating furnace 1 on the feed side via a charging machine 4, the feed side being able to be closed by a corresponding door 17. The charging machine 4 can in Wasserge Drive in cooled raceways 3 of the furnace, this area being referred to as storage zone 5, which results in a storage space which can store approximately 50% or more of the hourly furnace reference power. The water-cooled raceways 3, which, with the interposition of the impellers, support the charging machine 4, permit a considerable extension of the storage zone 5 known per se.

An der Oberseite des Wärmofens 1 und an der Rückseite desselben ist eine Abgassammelleitung 6 vorgesehen. Mit 7 ist ein Heißgasventilator bezeichnet, der beispielsweise bezüglich des Weges der Abgase hinter einem Rekuperator angeordnet ist und der über eine entsprechende Leitung 18 die aus der Abgassammelleitung 6 abgezogenen Gase einer Mischkammer 8 zuführt, in die schematisch angedeutete Brenner 9 münden. Die Mischkammer 8 ist mit einer Heißgasausströmöffnung 11 ausgerüstet, die zum Ofeninneren 10 führt. Die Heißgasausströmöffnung 11 steht dabei mit einem oder mehreren Heißgaskanälen 13 in Verbindung, die Ausströmöffnungen 12 aufweisen, die dann in den Ofenraum 10 münden. Das im Ofenraum 10 befindliche Wärmgut 2 wird von den Heißgasen umspült und walzreif erwärmt.On the top of the heating furnace 1 and on the back of the same, an exhaust manifold 6 is provided. 7 designates a hot gas fan, which is arranged, for example with respect to the path of the exhaust gases, behind a recuperator and which, via a corresponding line 18, feeds the gases withdrawn from the exhaust gas manifold 6 to a mixing chamber 8, into which the schematically indicated burners 9 open. The mixing chamber 8 is equipped with a hot gas outflow opening 11 which leads to the furnace interior 10. The hot gas outflow opening 11 is connected to one or more hot gas channels 13 which have outflow openings 12 which then open into the furnace chamber 10. The hot material 2 located in the furnace chamber 10 is washed around by the hot gases and heated to be ready for rolling.

Die Heißgastemperatur wird dabei stets so angesetzt, daß gegenüber der maximalen Wärmguttemperatur außerhalb der stärker abgekühlten Randzonen nur eine geringe Temperaturdifferenz auftritt, die nicht zu einer überhitzung jener Wärmgutteile ausreicht, die eine wesentlich höhere Temperatur als die Randzonen aufweisen.The hot gas temperature is always set in such a way that, compared to the maximum temperature of the material to be heated, there is only a slight temperature difference outside the more cooled edge zones, which is not sufficient to overheat those parts of the heat material which have a significantly higher temperature than the edge zones.

So wird z.B. bei einer Wärmgutoberflächentemperatur außerhalb der Randzonen von 1250° C eine Heißgastemperatur von 1260 - 1270° C eingestellt. Hierdurch ist eine schädliche überhitzung ausgeschlossen.For example, a hot gas temperature of 1260 - 1270 ° C is set at a surface temperature of the material to be heated outside the peripheral zones of 1250 ° C. This prevents harmful overheating.

Die abgekühlten Randzonen des Wärmgutes werden dagegen in technisch vertretbaren Nachwärmzeiten auf ca. 1250° C aufgeheizt, wobei die Fig. 4 eine entsprechende Temperaturverteilung zeigt.The cooled peripheral zones of the material to be heated, on the other hand, are heated to approximately 1250 ° C. in technically justifiable reheating times, FIG. 4 showing a corresponding temperature distribution.

Aus Sicherheitsgründen kann zusätzlich zwischen der Abgassammelleitung 6 und dem Heißgasventilator 7 eine Kühleinrichtung 15 vorgesehen sein, die nur dann mit dem Kühlmedium, z.B. Luft, beaufschlagt wird, wenn die maximale Grenztemperatur der rückgeführten Abgase, z.B. 7000 C, erreicht wird.For safety reasons, a cooling device 15 can also be provided between the exhaust gas manifold 6 and the hot gas fan 7, and the cooling medium, for example air, is only applied to it when the maximum limit temperature of the recirculated exhaust gases, for example 700 ° C., is reached.

Es ist auch grundsätzlich denkbar, daß der Ofen mit zwei Abgassammelleitungen 6 ausgerüstet wird, die in einem gewissen Abstand nebeneinander angeordnet sind. Die erste Abgassammelleitung in Richtung Aufgabe-Entnahmeseite könnte dann nur vom Heißgasventilator 7 für die Rückführung benutzt werden, während die zweite Abgassammelleitung auf den Rekuperator und den Kamin arbeiten könnte.It is also fundamentally conceivable that the furnace is equipped with two exhaust manifolds 6, which are arranged next to one another at a certain distance. The first exhaust manifold in the direction of the feed-removal side could then only be used by the hot gas fan 7 for the return, while the second exhaust manifold could work on the recuperator and the chimney.

Die Anlage ist auch für die Erwärmung von kaltem oder mittelwarmem Wärmgut geeignet. Der Unterofen wird in einem solchen Fall ebenfalls durch die Heißgaskanäle 13 beheizt. Die Abgasmengenrückführung wird dann jedoch weitgehend gedrosselt oder ganz abgeschaltet, um die Heißgastemperatur zu erhöhen.The system is also suitable for heating cold or medium-warm material. In such a case, the lower furnace is also heated by the hot gas channels 13. The exhaust gas quantity recirculation is then largely throttled or switched off completely to increase the hot gas temperature.

Zusätzlich können Brenner 16 am Oberofen eingeschaltet werden, so daß eine entsprechende Leistungssteigerung des gesamten Beheizungssystems erreichbar ist.In addition, burners 16 can be switched on at the upper furnace, so that a corresponding Lei performance increase of the entire heating system is achievable.

Die Brenner 9 und 16 sind in der Regel nicht an das Abgasrückführungssystem angeschlossen, obwohl eine direkte Beaufschlagung eines jeden Brenners mit rückgeführten Abgasen ebenfalls möglich wäre.The burners 9 and 16 are generally not connected to the exhaust gas recirculation system, although direct exposure of each burner to recirculated exhaust gases would also be possible.

Durch die Abgasrückführung und intensive Vermischung mit den am Brennermund austretenden Verbrennungsgasen wird die normale Verbrennungstemperatur des Brennstoffes beträchtlich herabgesetzt. Die umweltschädliche NO-Bildung dürfte dadurch um ca. 50 % reduziert werden. Dieser Vorteil ist wegen der zu beachtenden strengen NO-Vorschriften besonders kostenmäßig zu beachten.The normal combustion temperature of the fuel is considerably reduced by the exhaust gas recirculation and intensive mixing with the combustion gases escaping from the burner mouth. The environmentally harmful formation of NO should be reduced by about 50%. Because of the strict NO regulations to be observed, this advantage is particularly cost-intensive.

Bei der in Fig. 4 dargestellten Bramme ist die Temperaturverteilung durch die Isothermen 14 dargestellt. Deutlich ist der Temperaturabfall zu den Kanten hin erkennbar. Die Zahlen an den Isothermen zeigen die Temperaturen an.In the slab shown in FIG. 4, the temperature distribution is shown by the isotherms 14. The drop in temperature towards the edges is clearly visible. The numbers on the isotherms indicate the temperatures.

Claims (10)

1. Verfahren zum Betreiben eines Nachwärmofens für Brammen, Blöcke od. dgl. mit einer Förderung des Wärmgutes durch den mit Heißgasen betriebenen Ofen, dadurch gekennzeichnet, daß ein variabler Abgasanteil aus dem Ofen in eine Mischkammer zurückgeführt wird, in die die Heizbrenner münden und in der Mischkammer eine Regelung der Heißgasmenge und Heißgastemperatur der in den eigentlichen Ofenraum eingeführten Heißgase derart erfolgt, daß die Temperatur der Heißgase nur eine geringe Differenz gegenüber der maximalen Wärmguttemperatur aufweist.1. A method of operating a reheating furnace for slabs, blocks or the like. With a promotion of the heating material through the furnace operated with hot gases, characterized in that a variable proportion of exhaust gas from the furnace is returned to a mixing chamber into which the heating burners open and in the mixing chamber, the amount of hot gas and the temperature of the hot gas of the hot gases introduced into the actual furnace space are regulated in such a way that the temperature of the hot gases shows only a slight difference compared to the maximum temperature of the hot material. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abnahme der rückzuführenden Abgasanteile hinter dem Rekuperatordurchgang erfolgt.2. The method according to claim 1, characterized in that the decrease in the exhaust gas components to be recycled takes place behind the recuperator passage. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abnahme der rückzuführenden Gase unabhängig von dem Rekuperator erfolgt.3. The method according to claim 1, characterized in that the removal of the gases to be recycled takes place independently of the recuperator. 4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß eine Rückführung der Abgase unmittelbar zu den Brennern erfolgt.4. The method according to claim 1 to 3, characterized in that the exhaust gases are returned directly to the burners. 5. Nachwärmofen für Brammen, Blöcke od. dgl. mit einer Förderung des Wärmgutes (2) durch den mit Heißgasen betriebenen Ofenraum (10), einer an der Aufgabeseite angeordneten Speicherzone (5) für das Wärmgut (2); einer Fördereinrichtung für das Wärmgut (2) durch den Ofenraum und einer an der der Aufgabeseite gegenüberliegenden Entnahmeseite angeordneten Entnahmevorrichtung, wobei die Speicherzone (5) an der Aufgabeseite mittels einer entsprechenden Chargiermaschine (4) beschickbar ist, gekennzeichnet durch im Bereich der Speicherzone (5) innerhalb des Wärmofens (1) angeordnete Laufbahnen (3) für die Chargiermaschine (4).5. reheating furnace for slabs, blocks or the like. With a conveyance of the heating material (2) through the furnace chamber operated with hot gases (10), a storage zone (5) arranged on the feed side for the heating material (2); a conveyor for the heating material (2) the furnace chamber and a removal device arranged on the removal side opposite the feed side, the storage zone (5) on the feed side being able to be fed by means of a corresponding charging machine (4), characterized by tracks () arranged in the area of the storage zone (5) within the heating furnace (1) 3) for the charging machine (4). 6. Nachwärmofen nach Anspruch 5, dadurch gekennzeichnet, daß die Laufbahn (3) wassergekühlt ausgebildet ist.6. reheating furnace according to claim 5, characterized in that the track (3) is water-cooled. 7. Nachwärmofen nach Anspruch 5 und 6 zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß ein Heißgasventilator (7) vorgesehen ist, dessen Saugseite an eine Abgassammelleitung (6) anschließt und dessen Abgabeseite in eine Mischkammer (8) mündet, in der Heizbrenner (9) angeordnet sind, wobei die Mischkammer (8) mit Heißgasausströmöffnungen (11) zur Abgabe der in der Mischkammer (8) gemischten Gase in den Ofenraum (10) ausgerüstet ist.7. reheating furnace according to claim 5 and 6 for performing the method according to claim 1, characterized in that a hot gas fan (7) is provided, the suction side of which connects to an exhaust gas manifold (6) and whose discharge side opens into a mixing chamber (8) in which Heating burners (9) are arranged, the mixing chamber (8) being equipped with hot gas outflow openings (11) for discharging the gases mixed in the mixing chamber (8) into the furnace chamber (10). 8. Nachwärmofen nach Anspruch 7, gekennzeichnet durch zwischen der Abgassammelleitung (6) und dem Heißgasventilator (7) angeordnete Kühleinrichtungen (15) zur Kontrolle der maximalen Grenztemperatur der rückgeführten Abgase.8. reheating furnace according to claim 7, characterized by between the exhaust manifold (6) and the hot gas fan (7) arranged cooling devices (15) for controlling the maximum limit temperature of the recirculated exhaust gases. 9. Nachwärmofen nach einem oder mehreren der vorhergehenden Ansprüche, gekennzeichnet durch Zusatzbrenner (16) im Bereich des oberen Teiles des Ofenraumes (10).9. reheating furnace according to one or more of the preceding claims, characterized by additional burners (16) in the region of upper part of the furnace chamber (10). 10. Nachwärmofen nach Anspruch 7, dadurch gekennzeichnet, daß die Mischkammer (8) in Einzelkammern unterteilt ist, die mit unterschiedlichen Temperaturen betrieben werden können und die mit unterschiedlichen Heißgaskanälen (13) zum Ofenraum (10) führen, um gezielte Temperaturverteilungen entlang der Ofenlänge und ggf. der Ofenbreite zu ermöglichen.10. reheating furnace according to claim 7, characterized in that the mixing chamber (8) is divided into individual chambers which can be operated at different temperatures and which lead to the furnace chamber (10) with different hot gas channels (13) in order to achieve targeted temperature distributions along the length of the furnace and if necessary to allow the furnace width.
EP85110663A 1984-11-02 1985-08-24 Running process of a reheating furnace, and reheating furnace for billets, blocks or the like Ceased EP0183920A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3440048 1984-11-02
DE3440048A DE3440048C1 (en) 1984-11-02 1984-11-02 Reheating furnace for slabs or blocks

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EP0183920A2 true EP0183920A2 (en) 1986-06-11
EP0183920A3 EP0183920A3 (en) 1987-06-16

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EP85110663A Ceased EP0183920A3 (en) 1984-11-02 1985-08-24 Running process of a reheating furnace, and reheating furnace for billets, blocks or the like

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EP (1) EP0183920A3 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274206A3 (en) * 1987-01-07 1989-08-16 British Gas Plc Heating stock in a heating chamber

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
FR2766742B1 (en) * 1997-07-31 1999-09-24 Stein Heurtey DEVICE FOR TRANSFERRING BETWEEN A FIRST PREHEATING ENCLOSURE AND A SECOND HEATING ENCLOSURE
CN119222995B (en) * 2024-12-05 2025-03-14 安徽陶芯科半导体新材料有限公司 Mesh belt type atmosphere sintering furnace applied to production of DCB copper-clad ceramic substrate

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US3148868A (en) * 1960-03-24 1964-09-15 United States Steel Corp Reheating furnace
US3212763A (en) * 1964-03-05 1965-10-19 United States Steel Corp Reheating furnace
US3540706A (en) * 1969-02-19 1970-11-17 Salem Brosius Inc Heating furnace with skid rails
LU65915A1 (en) * 1972-08-17 1974-02-21
JPS5154813A (en) * 1974-11-08 1976-05-14 Chugai Ro Kogyo Kaisha Ltd Marukohenkanetsuro
DE2713014C2 (en) * 1977-03-24 1983-09-08 Westerhoff, Heinz, Dipl.-Ing., 4330 Mülheim Device for cooling the supports for the heating material of a heating furnace
JPS58105468U (en) * 1982-01-13 1983-07-18 中外炉工業株式会社 Continuous heat treatment furnace for pipes with upsets
DE3339585C1 (en) * 1983-11-02 1987-11-12 Didier Engineering Gmbh, 4300 Essen Heating furnace for reheating of pipes, special profiles and similar items to be heated

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274206A3 (en) * 1987-01-07 1989-08-16 British Gas Plc Heating stock in a heating chamber

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DE3440048C1 (en) 1986-03-27
EP0183920A3 (en) 1987-06-16
US4629418A (en) 1986-12-16

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