EP1001237A1 - Beheizungsverfahren eines kontinuierlich arbeitenden Ofens für Stahl Produkte und kontinuierlich arbeitender Ofen - Google Patents

Beheizungsverfahren eines kontinuierlich arbeitenden Ofens für Stahl Produkte und kontinuierlich arbeitender Ofen Download PDF

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Publication number
EP1001237A1
EP1001237A1 EP99402559A EP99402559A EP1001237A1 EP 1001237 A1 EP1001237 A1 EP 1001237A1 EP 99402559 A EP99402559 A EP 99402559A EP 99402559 A EP99402559 A EP 99402559A EP 1001237 A1 EP1001237 A1 EP 1001237A1
Authority
EP
European Patent Office
Prior art keywords
oxygen
zone
air
fuel
smoke
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.)
Withdrawn
Application number
EP99402559A
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English (en)
French (fr)
Inventor
Gérard Le Gouefflec
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP1001237A1 publication Critical patent/EP1001237A1/de
Withdrawn legal-status Critical Current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
    • F27B9/3011—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases arrangements for circulating gases transversally
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following 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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • F27B9/40—Arrangements of controlling or monitoring devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames

Definitions

  • the invention relates to the heating of continuous loading, and in particular a method of heating ovens intended to bring to high temperature, most uniformly possible, steel products can be strong section, for example slabs, billets, blooms or ingots, as well as such a heating furnace (or reheating).
  • the ovens for which this process is intended can be spar ovens, push ovens, rotating floor, in particular.
  • the invention also relates, for example, to furnaces for heat treatment ⁇ in the parade ⁇ especially for semi-finished or finished products (strips, tubes, wires, parts various).
  • an efficient oven is an oven delivering practically uniform temperature with good productivity, forming little scale (or oxides) on the surface, because the scale is removed just before rolling corresponds to a significant loss of matter, and no scale adherent, avoiding the phenomena of ure tapure ⁇ or burning of products, and producing little nitrogen oxide and carbon dioxide.
  • Continuous loading ovens affected by the invention generally extend longitudinally between one end of the product loading and one end of discharge, the products being transported from one end to the other to scroll all along the internal space from the oven.
  • these ovens include in succession zones presenting different functions, sometimes immediately identifiable as a result of the existence of internal walls or particular vault profiles, but sometimes without clear physical separation.
  • the section provided with burners thus comprises one or more several heating zones, for example from upstream to downstream a preheating zone, a proper heating zone said, and an equalization area near the end of charging where the reheated products are directed to a rolling plant for example; the developed flames by the burners allow heating directly products in the oven or indirectly as a result of the heat from the oven wall.
  • the essential mode of transmission heat is of the radiative type in the areas of heating and equalization (over 90%).
  • the ratio air / fuel is adjusted in slight excess of air to ensure total combustion and thus avoid any formation unburnt, and secondly that the temperature in the area without burner known as smoke recovery or exhaustion is significantly lower (900 ° C to 1000 ° C) than in the rest of the oven, which means that the share of heating convective in this area ceases to be negligible (approximately 30%) ; the temperature in this area can hardly the current time be increased because energy losses would be unacceptable.
  • the object of the invention is to remedy this drawback and for this purpose consists of a heating process for carrying high temperature steel products, in a continuous loading type oven in which one scrolls products from one end of the oven to one end in the oven, this oven having at least one zone heater fitted with air / fuel burners that we possibly dope with oxygen but whose combustion gives off a large volume of typical smoke from combustion with air, on the side of the end of charging, and a so-called recovery or exhaustion zone smoke, on the side of the charging end in the region from which smoke is evacuated, characterized process in that at least one combustible body is incorporated into the fumes in the gaseous state and oxygen gas is introduced in upstream of the possibly doped air / fuel burner which is the most upstream when we refer to the direction in which we scroll through the products, and we burn at least part of the combustible body in the gaseous state and so we raise the temperature in the recovery zone.
  • the invention also consists of a heating oven to bring steel products to high temperature, of the continuous loading type, in which the products pass from a charging end to a charging end, and having at least one heating zone fitted with air / fuel burners if necessary doped with oxygen, the combustion of which gives off a volume important smoke typical of combustion with air, on the side of the feed end, and an area known as recovery or exhaustion of smoke, on the side of the charging end in the region of which the smoke is evacuated, oven characterized in that it comprises devices for incorporating at least one body into the smoke fuel in gaseous state, and devices introduction of oxygen gas upstream of the burner air / fuel possibly doped which is furthest upstream when we refer to the direction of scrolling of the products, to burn at least part of the combustible body to the gaseous state and thus raise the temperature in the area of recovery.
  • This internal space includes a heating zone 4, fitted with symbolized air / fuel heating burners at 41, on the discharge end side, burners at which, as a result of combustion, are released high temperature fumes (around 1200 ° VS) ; the heating zone 4 can itself be subdivided in several zones such as, from upstream to downstream, a zone of preheating, an actual heating zone, and a equalization area.
  • the internal space of the oven also includes a burner-free zone called recovery or exhaustion 5, in which the fumes have circulated heat released at the burners to recover part of their energy before recovering it themselves out of the oven in the end region charging 2 to heat the air sent to the burners.
  • air / fuel burners non means no only conventional air / fuel burners, but also air / fuel burners that we boost oxygen but releasing however a significant volume of fumes typical of combustion with air.
  • the oven shown very schematically in Figure 2 has in addition, in the recovery or exhaustion zone 5 of fumes, oxygen introduction devices 51. Thanks to the fact that we introduce oxygen, we can works a delayed combustion, by which we raise the temperature in this area; to do this, we dose the gases that we introduce at the air / fuel burners 41 (which we possibly doped with oxygen) in the area heating 4 so that the air / fuel ratio either at a sub-stoichiometric level, so that the fumes products that are brought into the recovery zone contain unburnt products which may react with oxygen.
  • the setting of the burners air / fuel 41 at a sub-stoichiometric air / fuel ratio is just one example of ways to incorporating a combustible body in the gaseous state into the fumes (here unburnt), and which can alternatively be provided and set one or more oxy-fuel burner (s) in the heating zone at a sub-stoichiometric oxygen / fuel ratio or inject fuel using a fuel injector in the heating zone or at the inlet recovery zone (in the direction of traffic fumes).
  • oxygen can be introduced by devices of introduction of oxygen 51 as here clearly in the smoke recovery zone 5, or at the entrance to this zone 5 (if we consider the direction of movement of fumes, which come from the heating zone 4), or even close to it, that is, more generally, upstream of the air / heating fuel burner 41 of the heating zone 4 which is furthest upstream when refers to the direction of movement of the products 1 in the oven (from the charging end 2 at the charging end 3).
  • the devices for introducing oxygen and / or fuel for example by means of air, nitrogen or water.
  • the ratio air / fuel at a corresponding sub-stoichiometric level at a value in the range of 0.95 to 0.99.
  • the pressure is adjusted to a very low level, possibly slightly depressed (a few millimeters in column water).
  • the oven is provided a control device (not shown); this equipment includes at least one probe by means of which measures the oxygen and / or oxide content of the smoke carbon leaving the oven, for example in a duct and a regulating device by means of which one regulates one of the air / gas ratios of the burners or the ratio oxygen / delayed combustion gas.
  • Wall losses can be considered as being identical.
  • the energy transferred to the product therefore slightly decreased in heating and equalization zones.
  • the term (1-x) E2 corresponds precisely reduction of the energy lost by the fumes as a result reduction in the volume of smoke leaving the oven.
  • the surplus energy can be harnessed by reducing the consumption of combustible gas or by increasing the rate of production.
  • G production (1-x) E2 / (W1 + W2) * 100 (value expressed in%).
  • the emission of oxides is reduced of nitrogen because the production of these in a flame is essentially related to the temperature of the flame and its stoichiometry; however, in the technique used, as a work with a sub-stoichiometric flame, we reduce slightly the flame temperature, and, due to the character flame reducer, production is greatly disadvantaged nitrogen oxides; moreover, in the recovery zone, temperatures are not raised enough to generate nitrogen oxides. As a result, this technique clearly differs from conventional doping techniques by which emissions of nitrogen oxides are generated relatively large.
  • the semi-finished products enter the heating zone at a uniform temperature of 500 ° C. and reach the temperature of 1050 ° C. at mid-thickness after 2450 seconds, while in an equivalent oven fitted out according to the invention, semi-finished products enter the heating zone at around 600 ° C and, thanks to the thermal recovery of the recovery zone, reach the temperature of 1050 ° C at mid-thickness after 1780 seconds.
  • the loss on ignition of the products is also considerably reduced by surface oxidation.
  • This loss can be between 0.5% and 1.5%; the oxidation which causes it is essentially linked to the oxidizing species present in the furnace, namely O 2 and CO 2 in particular; this oxidation is all the more important as the product is hot.
  • the technique according to the invention makes it possible to carry out a reducing adjustment in the hot zones, and to supplement with oxidizing oxygen up to stoichiometry when the product is not yet very hot; the scale formed is therefore reduced because the product during a large part of the cycle is in contact with a less aggressive atmosphere in terms of oxidation.
  • the reduction setting is made possible by delayed combustion with oxygen, use in the recovery zone making it possible to carry out an additional heat transfer to the charge as mentioned above; on the other hand, delayed combustion in air would result in increased smoke losses. It can be noted that this technique differs from traditional doping techniques (global do-page or by lance) that could be envisaged in such ovens, which do not modify the atmosphere in contact with the product.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP99402559A 1998-11-10 1999-10-18 Beheizungsverfahren eines kontinuierlich arbeitenden Ofens für Stahl Produkte und kontinuierlich arbeitender Ofen Withdrawn EP1001237A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9814127A FR2785668B1 (fr) 1998-11-10 1998-11-10 Procede de chauffage d'un four a chargement continu notamment pour produits siderurgiques, et four de chauffage a chargement continu
FR9814127 1998-11-10

Publications (1)

Publication Number Publication Date
EP1001237A1 true EP1001237A1 (de) 2000-05-17

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ID=9532571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402559A Withdrawn EP1001237A1 (de) 1998-11-10 1999-10-18 Beheizungsverfahren eines kontinuierlich arbeitenden Ofens für Stahl Produkte und kontinuierlich arbeitender Ofen

Country Status (7)

Country Link
US (1) US6183246B1 (de)
EP (1) EP1001237A1 (de)
JP (1) JP2000144241A (de)
AR (1) AR021119A1 (de)
BR (1) BR9905320A (de)
CA (1) CA2286967A1 (de)
FR (1) FR2785668B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021061A1 (fr) * 2000-09-08 2002-03-14 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de rechauffage de produits metallurgiques
FR2824078A1 (fr) * 2001-04-26 2002-10-31 Air Liquide Procede pour controler le profil d'un four et ameliorer les produits traites
CN100397021C (zh) * 2001-09-06 2008-06-25 乔治洛德方法研究和开发液化空气有限公司 改善炉子温度分布的方法

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3474848B2 (ja) 2000-12-12 2003-12-08 新日本製鐵株式会社 回転再生式熱交換器の運転方法
SE521170C2 (sv) * 2002-02-22 2003-10-07 Linde Ag Förfarande för värmebehandling av rostfritt stål
DE102006005635A1 (de) * 2006-02-08 2007-08-09 Sms Demag Ag Rollenherdofen zum Aufheizen und/oder Temperaturausgleichen von Stranggiessprodukten aus Stahl oder Stahllegierung und dessen Anordnung vor einer Warmband-Fertigwalzstrasse
US20090136884A1 (en) * 2006-09-18 2009-05-28 Jepson Stewart C Direct-Fired Furnace Utilizing An Inert Gas To Protect Products Being Thermally Treated In The Furnace
US20080092754A1 (en) * 2006-10-19 2008-04-24 Wayne/Scott Fetzer Company Conveyor oven
US8075304B2 (en) 2006-10-19 2011-12-13 Wayne/Scott Fetzer Company Modulated power burner system and method
US7550126B2 (en) * 2007-01-25 2009-06-23 Southwest Research Institute NOx augmentation in exhaust gas simulation system
JP5086657B2 (ja) * 2007-02-08 2012-11-28 新日鉄エンジニアリング株式会社 回転炉床式還元炉及びその操業方法
FR2920438B1 (fr) * 2007-08-31 2010-11-05 Siemens Vai Metals Tech Sas Procede de mise en oeuvre d'une ligne de recuit ou de galvanisation en continu d'une bande metallique
IT202000013285A1 (it) * 2020-06-04 2021-12-04 Danieli Off Mecc Procedimento e apparato per il riscaldo di prodotti siderurgici

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2179532A1 (en) * 1972-04-11 1973-11-23 Heurtey Sa Reducing atmos strip preheating furnace - with convective post combustive recuperation
JPS60215716A (ja) * 1984-04-11 1985-10-29 Nippon Kokan Kk <Nkk> 加熱炉の燃焼方法
EP0184749A2 (de) * 1984-12-06 1986-06-18 Linde Aktiengesellschaft Verfahren zum Brennen von oxidierbare Bestandteile enthaltenden Materialien
EP0661499A1 (de) * 1993-11-26 1995-07-05 Sollac S.A. Echtzeitregelung eines Brenner für Brenngase mit underschiedlichen Eigenschaften, insbesondere für metallurgischen Ofen zum Wärmen
JPH09263835A (ja) * 1996-03-28 1997-10-07 Nippon Steel Corp 連続加熱方法および装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713480A (en) * 1950-08-14 1955-07-19 Ruckstahl Alfred Heat treating apparatus
JPS5118205B2 (de) * 1972-03-03 1976-06-08
US3841614A (en) * 1971-12-06 1974-10-15 Kawasaki Heavy Ind Ltd Apparatus for preheating steel ingot or blooms by the use of high-speed jet streams as well as heating furnace using the same
US4397451A (en) * 1981-06-10 1983-08-09 Chugai Ro Kogyo Co., Ltd. Furnace for the heat treatment of scale-covered steel
DK0614452T3 (da) * 1991-11-29 1996-08-19 Robin Anthony Kyffin Varmebehandling af et materiale, som kan opblæres, til fremstilling af et let tilslagsmateriale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2179532A1 (en) * 1972-04-11 1973-11-23 Heurtey Sa Reducing atmos strip preheating furnace - with convective post combustive recuperation
JPS60215716A (ja) * 1984-04-11 1985-10-29 Nippon Kokan Kk <Nkk> 加熱炉の燃焼方法
EP0184749A2 (de) * 1984-12-06 1986-06-18 Linde Aktiengesellschaft Verfahren zum Brennen von oxidierbare Bestandteile enthaltenden Materialien
EP0661499A1 (de) * 1993-11-26 1995-07-05 Sollac S.A. Echtzeitregelung eines Brenner für Brenngase mit underschiedlichen Eigenschaften, insbesondere für metallurgischen Ofen zum Wärmen
JPH09263835A (ja) * 1996-03-28 1997-10-07 Nippon Steel Corp 連続加熱方法および装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8549, Derwent World Patents Index; AN 85-308017, XP002112852 *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 02 30 January 1998 (1998-01-30) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002021061A1 (fr) * 2000-09-08 2002-03-14 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de rechauffage de produits metallurgiques
FR2813893A1 (fr) * 2000-09-08 2002-03-15 Air Liquide Procede de rechauffage de produits metallurgiques
US6652681B2 (en) 2000-09-08 2003-11-25 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Method of reheating metallurgical products
FR2824078A1 (fr) * 2001-04-26 2002-10-31 Air Liquide Procede pour controler le profil d'un four et ameliorer les produits traites
CN100397021C (zh) * 2001-09-06 2008-06-25 乔治洛德方法研究和开发液化空气有限公司 改善炉子温度分布的方法

Also Published As

Publication number Publication date
BR9905320A (pt) 2000-09-05
AR021119A1 (es) 2002-06-12
FR2785668A1 (fr) 2000-05-12
US6183246B1 (en) 2001-02-06
CA2286967A1 (en) 2000-05-10
JP2000144241A (ja) 2000-05-26
FR2785668B1 (fr) 2001-02-23

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