EP0971192B1 - Verbesserung an Wärmöfen für Eisenhüttenprodukte - Google Patents

Verbesserung an Wärmöfen für Eisenhüttenprodukte Download PDF

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Publication number
EP0971192B1
EP0971192B1 EP99401285A EP99401285A EP0971192B1 EP 0971192 B1 EP0971192 B1 EP 0971192B1 EP 99401285 A EP99401285 A EP 99401285A EP 99401285 A EP99401285 A EP 99401285A EP 0971192 B1 EP0971192 B1 EP 0971192B1
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EP
European Patent Office
Prior art keywords
products
furnace
zone
zones
heating
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.)
Expired - Lifetime
Application number
EP99401285A
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English (en)
French (fr)
Other versions
EP0971192A1 (de
Inventor
Nathan Frydman
Frédéric Martin
François Pahmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
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Application filed by Stein Heurtey SA filed Critical Stein Heurtey SA
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Classifications

    • 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
    • F27B9/14—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 tunnel furnace
    • F27B9/201—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 tunnel furnace walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/203—Conveyor mechanisms therefor having ramps
    • 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 tunnel furnace
    • F27B9/201—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 tunnel furnace walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/207—Conveyor mechanisms therefor consisting of two or more conveyors
    • 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 peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices

Definitions

  • the present invention relates to a reheating of steel products to reduce or eliminate losses of production during reheating of batches of different products introduced successively in the oven.
  • US 3,304,210 relates to a method for reheating billets with limitation of their decarburization. This process consists of heating the billets at slow speed up to a temperature of the order of 600 ° C. then, above this temperature, the transfer of billets is accelerated in order to limit their residence time in a area where decarburization occurs. Reducing the residence time of the billets in the oven is provided to limit the chemical reactions taking place on the surface some products. This document does not discuss the problem of rolling after a reheating furnace and possible production losses when reheating lots of different products.
  • reheating ovens are intended to carry, to temperatures required for rolling, steel products such as slabs, blooms, billets, sketches or any other semi-finished steel product.
  • the precision of the thermal state of the products is imperative for the quality of the rolling of steels, in particular high carbon steels, stainless steels, ferritic steels and austenitics, silicon steels, etc.
  • the average temperature level is obtained by passing the products through so-called heating zones which are characterized by thermal input important which generates a large thermal heterogeneity in the products.
  • the temperature uniformity of the products reaches the desired levels thanks to the passage of said products, for a controlled period, in an equalization zone in which the heat input is very low, which makes it possible to obtain the homogenization of temperatures within the products.
  • FIG. 1 of the accompanying drawings is a diagram illustrating an example of reheating of two batches of products with target temperatures different. This diagram represents the discharge temperatures as a function of the time.
  • the products of the first batch must be reheated at a temperature T1 and the products of the second batch must be reheated to a temperature T2.
  • Products 1 to 5 belonging to the first batch are sold to instants t1 to t5 after being heated to a temperature which is located in the temperature tolerance range T1.
  • products 8 to 13 forming part of the second batch are discharged at times t8 to t13, after having been heated to a temperature within the tolerance range of temperature T2.
  • Products 6 and 7, supplied in the time range between t5 and t8 have a temperature that is outside the tolerances of the temperatures T1 and T2 and therefore cannot be placed in the first batch, nor in the second batch and they must therefore be downgraded or discarded.
  • the products 6 and 7, outside tolerances when the oven is placed in the oven.
  • the locations of these products constitute what should be called a "hole" in the oven load. The presence of this hole causes a discontinuity in the charging and in the feed rate of the rolling mill positioned downstream of the furnace, between instants t5 and t8, which results in a loss of production which corresponds to the time interval between two thermal products acceptable.
  • the principle set out above for temperature changes between two batches of products can also be transposed to all adjustment changes of an oven resulting from a modification of one or more characteristics physical products from a first batch to a different second batch or a modification of their thermal objectives.
  • the "holes” constitute physical separations between the different lots. They allow time for the oven zones to pass from the one batch area at the next batch zone temperature.
  • the present invention applies more particularly to a furnace for reheating billets, blooms, slabs, blanks or any other semi-finished steel products.
  • At least two zones are provided successive equalization at least one of which can be used to homogenization of product temperature.
  • FIG. 2 of the accompanying drawings illustrates the operating principle of an oven provided improvements which are the subject of the present invention.
  • This figure is a diagram on which the bed of products has been represented in the oven opposite the one or more heating zones and at least two designated equalization zones zone E1 and zone E2 respectively following the heating zone or zones.
  • This diagram refers to an example of operation of the oven during a passage of a first batch of products designated by references 1 to 10 to a second batch of products referenced 11 to 23.
  • the difference in setting the oven zones for reheating the products of the first and second batch may be imposed by one or more differences between the physical characteristics of the products of these two lots, by a difference between the thermal objectives of the products or by a difference with regard to the needs of rolling equipment located downstream of the furnace.
  • the diagram in FIG. 2 refers to an example of operation of the oven relating to reheating two batches of products: the first batch being reheated to one temperature T1 and the second batch being heated to a temperature T2, the temperature T2 being higher than temperature T1.
  • this principle is easily transposable to the operation of the oven for any adjustment change related to the heating of products whose physical characteristics or thermal objectives are different.
  • the length is optimized "holes" in the loading of the oven between two batches of lens products different temperatures, depending on the characteristics of the oven, products and rate of delivery, without creating discontinuity of delivery of oven products, therefore loss of production.
  • the equalization zone E2 is used for the homogenization of the temperatures of the products of the second batch, the equalization zone E1 being used, either for equalization, ie for the end of product heating.
  • the transfer of the products of the second batch in zone E2 is carried out in one or several times to ensure the maintenance of the thermal objective of the products of the second batch within the previously defined tolerances.
  • the products to be reheated designated by the reference 1 are treated in an insulated enclosure 2 using burners shown schematically in 3.
  • the products are supported and transferred over the entire length of the oven using fixed and mobile beams designated by the reference 4.
  • the mobile beams are integral with a frame 5 allowing their movement in horizontal translation, the whole resting on a system consisting of a beam 6 resting itself on rollers which can move on wedges in the form of an inclined plane, this system as being designed to allow lifting movement of mobile side rails.
  • the translational movement of the products is obtained using a cylinder 7 acting on the chassis 5, while the lifting movement is obtained by means of a jack 8 moving the chassis 6 along planes inclined.
  • the entire bed of products such as 1 rests on a unique support / transfer equipment, all bed products moving at the same speed and the same distance, with each movement of said equipment.
  • the functions which have been mentioned in the description made above are carried out using mechanical systems which ensure rapid transfer of the products, in the last zone or zones of the oven, these mechanical systems being able moreover to ensure a rapid discharge of the produced by frontal or lateral evacuation.
  • FIG. 4 illustrates a first embodiment a device for performing the functions of the invention.
  • These measures essentially comprises arms designated by the reference 10 and actuated by a device 11 for entering the products.
  • the arms such as 10 are therefore located substantially at the level of the side members supporting and transferring the products.
  • the product to be turned around designated by the reference 9 is located at the end of the equalization zone (E1) in FIG. 2 and it is grasped by the arms 10 of so as to be removed from the oven in a single operation in order to carry out the feeding of the rolling mill (not shown in the drawing).
  • this system allows for a rapid transfer of the products to the last zone of the oven as well as their fast feed, in order to control the incidence of the last zone (s) of the oven on the thermal state of the product.
  • the charging system consisting of the arms 10 and their actuating device 11, can be arranged to so as to ensure a front or side discharge of the oven, of a product seized by said system inside the oven, at a given point in its thermal cycle in view its discharge outside the oven, for example to a rolling mill (not shown in the drawing).
  • FIG. 5 illustrates another embodiment a mechanical device making it possible to carry out the functions of the invention.
  • an independent supporting and supporting section is provided. transfer of products inside the oven, this section allowing movement of the or products supported at a speed independent of that of the products

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Electric Ovens (AREA)

Claims (8)

  1. Ofen zum Aufheizen von Eisenhüttenprodukten zum Reduzieren oder Unterdrücken von Produktionsverlusten beim Aufheizen von Chargen von Produkten mit voneinander unterschiedlichen thermischen Zuständen, die aufeinander folgend in den Ofen eingeführt werden, dadurch gekennzeichnet, dass besagter Ofen Heizbereiche umfasst, auf die mindestens zwei Ausgleichsbereiche (E1, E2) folgen, wobei
    der erste Ausgleichsbereich (E1) zumindest als Heizbereich benutzt werden kann,
    der letzte Ausgleichsbereich (E2) von den Produkten mit einer Geschwindigkeit durchlaufen werden kann, die von der in den anderen Bereichen unterschiedlich ist, wobei diese Geschwindigkeit in Funktion vom thermischen Zielwert der aufzuheizenden Produkte regelbar ist.
  2. Ofen nach Anspruch 1, dadurch gekennzeichnet, dass der besagte Heizofen zum Aufheizen von vorgewalzten Eisenblöcken, Barren, Brammen, Rohlingen und anderen eisenhüttentechnischen Halbzeugen verwendet wird.
  3. Ofen nach Anspruch 1, dadurch gekennzeichnet, dass der besagte Ofen mindestens zwei aufeinander folgende Ausgleichsbereiche umfasst, von denen mindestens einer dazu verwendet wird, die Homogenisierung der Temperaturen der Produkte sicherzustellen.
  4. Ofen nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der besagte Ofen mit mechanischen Systemen (10, 11; 12, 15, 16) ausgestattet ist, die den schnellen Durchlauf der Produkte (9; 13) in der oder den letzten Zone(n) des Ofens sicherstellen.
  5. Ofen nach Anspruch 4, dadurch gekennzeichnet, dass die besagten mechanischen Systeme (10, 11; 12, 15) auch eine schnelle Entnahme der Produkte aus dem Ofen sicherstellen.
  6. Ofen nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die besagten mechanischen Systeme (10, 11; 12, 15) so ausgelegt sind, dass sie eine frontale oder seitliche Entnahme eines im Inneren des Ofens an einem gegebenen Punkt seines thermischen Zyklus zur Entnahme nach außerhalb des Ofens aufgegriffenen Produkts ermöglichen.
  7. Ofen nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die besagten mechanischen Systeme Arme (10) zum Greifen der Produkte und Mittel (11) zum Betätigen der besagten Arme umfassen.
  8. Ofen nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die besagten mechanischen Systeme in Gestalt eines unabhängigen Abschnitts (12) zum Stützen und Fortbewegen von Produkten im Inneren des Ofens ausgeführt sind, wobei dieser Abschnitt eine Fortbewegung der Produkte mit einer Geschwindigkeit ermöglicht, die unabhängig von derjenigen der Produkte ist, die durch die anderen Abschnitte des Ofens getragen und fortbewegt werden.
EP99401285A 1998-06-11 1999-05-28 Verbesserung an Wärmöfen für Eisenhüttenprodukte Expired - Lifetime EP0971192B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9807374A FR2779742B1 (fr) 1998-06-11 1998-06-11 Perfectionnements apportes aux fours de rechauffage de produits siderurgiques
FR9807374 1998-06-11

Publications (2)

Publication Number Publication Date
EP0971192A1 EP0971192A1 (de) 2000-01-12
EP0971192B1 true EP0971192B1 (de) 2004-02-11

Family

ID=9527280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99401285A Expired - Lifetime EP0971192B1 (de) 1998-06-11 1999-05-28 Verbesserung an Wärmöfen für Eisenhüttenprodukte

Country Status (8)

Country Link
US (1) US6238210B1 (de)
EP (1) EP0971192B1 (de)
JP (1) JP2000008119A (de)
CN (1) CN1138963C (de)
AT (1) ATE259496T1 (de)
DE (1) DE69914677T2 (de)
ES (1) ES2212490T3 (de)
FR (1) FR2779742B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2954353B1 (fr) 2009-12-23 2012-01-13 Fives Stein Four de rechauffage a longerons mobiles agence pour un evacuation de la calamine
FR3053105B1 (fr) 2016-06-27 2018-06-15 Fives Stein Installation de recuperation d'energie calorifique sur un four a longerons tubulaires et de conversion de celle-ci en electricite au moyen d'une turbine produisant de l'electricite par la mise en oeuvre d'un cycle de rankine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3304210A (en) * 1962-10-20 1967-02-14 Svenska Metallverkens Ugns Akt Process in the heating of metal billets and an arrangement for carrying out the process
DE2723626A1 (de) * 1977-05-25 1978-11-30 Chugai Ro Kogyo Kaisha Ltd Aufheizverfahren in einer heisswalzstrasse und nachwaermofen zur durchfuehrung des verfahrens
DE3132373A1 (de) * 1981-01-16 1982-07-29 Didier Engineering Gmbh, 4300 Essen Ofen zum erwaermen von brammen, knueppeln und rohlingen
JP2590182B2 (ja) * 1987-03-07 1997-03-12 株式会社東芝 黒化炉およびこの黒化炉を使用したシャドウマスクの製造方法
JPH0714353Y2 (ja) * 1988-07-08 1995-04-05 中外炉工業株式会社 ローラハース型熱処理炉
IT1227500B (it) * 1988-11-25 1991-04-12 Heurtey Italiana Spa Forno di riscaldo, mantenimento ed accumulo di prodotti siderurgici.
FR2659582B1 (fr) * 1990-03-13 1992-06-12 Stein Heurtey Dispositif pour assurer le dechargement et le transfert de produits siderurgiques.
DE4140740A1 (de) * 1991-06-12 1992-12-17 Loi Ind Ofenanlagen Durchlaufofen
FR2725016B1 (fr) * 1994-09-27 1997-01-17 Stein Heurtey Four de rechauffage, de maintien et d'accumulation de produits siderurgiques
DE737755T1 (de) * 1995-04-13 1998-01-29 Patherm Sa Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken

Also Published As

Publication number Publication date
US6238210B1 (en) 2001-05-29
JP2000008119A (ja) 2000-01-11
DE69914677T2 (de) 2005-01-13
ES2212490T3 (es) 2004-07-16
CN1138963C (zh) 2004-02-18
FR2779742B1 (fr) 2000-08-11
CN1239216A (zh) 1999-12-22
EP0971192A1 (de) 2000-01-12
FR2779742A1 (fr) 1999-12-17
ATE259496T1 (de) 2004-02-15
DE69914677D1 (de) 2004-03-18

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