EP0198814A2 - Four à réchauffer et égaliser en température de l'acier chaud - Google Patents

Four à réchauffer et égaliser en température de l'acier chaud Download PDF

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Publication number
EP0198814A2
EP0198814A2 EP86890073A EP86890073A EP0198814A2 EP 0198814 A2 EP0198814 A2 EP 0198814A2 EP 86890073 A EP86890073 A EP 86890073A EP 86890073 A EP86890073 A EP 86890073A EP 0198814 A2 EP0198814 A2 EP 0198814A2
Authority
EP
European Patent Office
Prior art keywords
reheating
zone part
temperature
furnace
burners
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Withdrawn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
EP86890073A
Other languages
German (de)
English (en)
Other versions
EP0198814A3 (fr
Inventor
Aktiengesellschaf Voest-Alpine
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0198814A2 publication Critical patent/EP0198814A2/fr
Publication of EP0198814A3 publication Critical patent/EP0198814A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • 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 walking beam furnace

Definitions

  • the invention relates to a reheating furnace for reheating and for equalizing the temperature of hot, hot-deformable, in particular to be rolled steel material to hot-forming temperature, in particular of continuously cast material, with an oven space divided into at least two zones, provided with burners and a flue gas outlet.
  • the aim is to subject the steel to be thermoformed directly to the hot shaping as soon as possible after it has been produced, that is to say without prior cooling.
  • slabs, billets or blooms are to be subjected to further hot shaping in order to save energy by using the heat contained in the steel material by the casting process.
  • the edges of the steel material have often already cooled considerably, even if the core is still at the high temperature required for hot forming. It is therefore inevitable to reheat the continuously cast material even in the so-called direct rolling of continuously cast material and to carry out a temperature compensation over the cross section.
  • heating furnaces walking beam or push furnaces
  • heating furnaces are not suitable for heating cold steel to a hot forming temperature, for which the temperature increase is only slight for hot steel; overheating of the hot steel in such heating furnaces can occur.
  • Another disadvantage is the fact that the heating furnace is underutilized, making the end product more expensive.
  • the invention aims at avoiding these disadvantages and difficulties and has as its object to create a furnace with which, considering economic aspects, reheating and temperature-equalization of hot steel to hot forming temperature is possible, the risk of overheating of the steel being eliminated and the burners provided in the furnace can be optimally used.
  • the furnace chamber is divided into a post-heating zone part and a compensation zone part, which is preferably divided by a separating weir, the - burners being arranged at the inlet end and the flue gas outlet at the outlet end in the post-heating zone part in order to form a temperature profile, at which a highest temperature at the inlet end and a lowest temperature at the outlet end of the reheating zone part is reached.
  • the steel material passes through the hottest area of the furnace immediately after entering the post-heating zone part, so that the edges or surfaces can immediately absorb the heat still required, whereupon the steel product arrives in the cooler area of the post-heating zone part, so that Overheating of both the edges and the core of the steel material can be reliably avoided.
  • the flue gas outlet is expediently arranged below the transport level of the furnace.
  • a furnace for heating long billets is known from DE-Ps 152.851. This furnace is equipped with high-speed burners to achieve good heat transfer with the lowest possible temperature differences.
  • high-speed burners are expediently arranged in the after-heating zone part above and / or below the transport plane.
  • burners which are preferably arranged above the transport level of the reheating furnace, are provided on the end face of the reheating zone part and are directed in the transport direction.
  • burners which are preferably arranged below the transport plane of the reheating furnace, in the side walls of the reheating zone part and to direct them transversely to the transport direction.
  • a preferred embodiment is characterized in that a temperature sensor for measuring the extracted flue gas temperature is provided in the flue gas outlet, which is connected in a manner known per se via a control loop to a fuel control element and / or a burner control unit.
  • a storage zone part is expediently connected upstream of the reheating zone part, in which a transport system is provided for the optional finishing of each individual steel piece, which is independent of the transport system of the reheating and compensation zone part.
  • the storage component i) is preferably equipped with a walking beam conveyor, the walking beams of which are divided into lifting tables that can be raised and lowered transversely to the conveying direction and whose length in the conveying direction corresponds approximately to the width of a piece of steel product.
  • the lifting tables can be lifted and lowered individually according to the conveying task - tracking individual steel goods or groups of steel goods for transfer to the lifting conveyor of the reheating and compensation zone part - or in the necessary combination of adjacent lifting tables.
  • FIG. 1 shows a diagrammatic view of the post-heating furnace in an oblique view
  • FIG. 2 shows a vertical section in the longitudinal direction of the furnace
  • FIG. 3 shows a cross section along the line III-III of FIG. 2 demonstrate.
  • Fig. 4 shows the detail IV of Fig. 2 on a larger scale.
  • Fig. 5 shows the temperature curve over the length of the reheating furnace in diagram form. 6 and 7 illustrate, in a representation analogous to FIG. 2, the control devices for setting a specific temperature profile in the furnace chamber.
  • the furnace chamber 1 of the reheating furnace 2 shown in the drawing is composed of three zone parts which individually treat the steel material 3 to be reheated, namely the storage zone part 5 arranged first in the conveying direction 4 of the steel material 3, which ends in the reheating zone part 6, which in turn leads to the compensating zone part 7 of the reheating furnace 2 passes over.
  • the storage zone part 5 has a low room height 8, so that the steel material 3, in the illustrated embodiment it is a continuous cast slab with its longitudinal axis 9 transverse to the conveying direction 4 of the steel material 3 through the furnace, a relatively short distance from the refractory-lined Cover 10 of the storage ion part 5. No burners are provided in the storage zone part 5.
  • the input opening 11 is closed by an insertion door 12.
  • the continuous cast slabs 3 fed into the storage zone part 5 are conveyed by means of a walking beam conveyor 13 which forms the bottom of this part in a conveying plane 14 in the conveying direction 4 from the storage zone part 5 into the reheating zone part 6 and from there by means of a separate walking beam conveyor 15 into the compensating zone part 7 and further.
  • the walking beam conveyor 15 located in the compensating zone part 7 and in the reheating zone part 6 is of conventional construction and is preferably designed as a walking beam conveyor 15 which supplies these two parts 6, 7, the walking beam conveyor 13 of the storage zone part 5 is constructed in such a way that the continuous cast slabs 3 can be conveyed individually , so that they are closely adjacent in the reheating zone even if they are used in the storage zone part 5 at different time intervals, as is the case, for example, when the continuous cast slabs are not exactly transported in batches, but batchwise to the reheating furnace.
  • the walking beam conveyor 13 of the storage zone part has lifting tables 17, which can be raised and lowered between the fixed fixed bars 16 and which are transverse to the conveying direction 4 and whose length 18 in the conveying direction 4 corresponds approximately to the width of a continuous casting slab 3.
  • the walking beam conveyor 13 also has a traveling frame 21 which can be moved in the conveying direction 4 by means of wheels 19 and in the opposite direction by means of a pressure medium cylinder 20, on which the individual lifting tables 17 are mounted such that they can be raised and lowered, etc.
  • the lifting tables 17, which are arranged transversely to the conveying direction 4 at a point along the longitudinal extent of the storage zone part 5, are raised and lowered together, so that a continuous casting slab 3 lying on these lifting tables 17 is lifted with all lifting tables 17 on which it rests.
  • a lifting frame 22 which is movably mounted on the traveling frame 21 transversely to the direction of travel 4 and which can be moved in the direction of the double arrow 24 by means of a pressure center cylinder 23, is used for lifting and lowering.
  • This lifting frame 22 is supported by rollers 25 on the one hand on the moving frame 21 and on the other hand on a support frame 26 on which the lifting tables 17 which can be raised and lowered together are, etc. via lifting wedges 27 attached to the underside of the support frame 26.
  • systems of waterproofing cups 29 are provided, each of which surrounds a supporting structure 30 of a lifting table 17 and which are fastened to the support frame 26, into which Immerse the immersion strips 31 attached to the stationary lining 28 of the furnace or the fixed beams 16 and immersion strips 32 attached to the lifting tables 17 for the purpose of sealing the furnace atmosphere.
  • the post-heating zone part 6 has a much larger furnace interior in cross section than the storage zone part, etc. the ceiling 34 and the floor 35 at a large distance 'from the conveyor plane 14 are arranged.
  • the ceiling 10 and the floor 13 of the storage zone part merge into the ceiling 34 and the floor 35 of the reheating zone part by means of vertical end walls 36, 37.
  • the upper end wall 36 In the upper end wall 36 are high-speed burners 38, etc. so-called pulse burner, installed, as illustrated in Fig. 4.
  • the end wall 36 is penetrated by a burner block 39 which has a passage opening 40 which narrows towards the furnace interior.
  • the actual burner 41 is provided on the outside of the burner block and is connected to a fuel gas supply line 42 and to a combustion air supply line 43.
  • the flame 44 burning in the passage opening 40 causes a high exit velocity of the fuel gases, which leads to a strong flue gas circulation within the reheating zone part 6.
  • additional burners 46 which are also designed as high-speed burners, are optionally provided in the end walls 36 in addition to the high-speed burners 38. These burners 46 are arranged below the conveyor level 14.
  • the flue gas outlet 48 is located at the outlet-side end 47 of the reheating zone part, etc. also below the funding level 14.
  • the compensating zone part 7 which is of approximately conventional construction, adjoins the reheating zone part 6 by means of a separating weir 49 which extends close to the steel material 3.
  • the separating weir 49 serves to keep the flue gas atmosphere of the compensating zone part 7 unaffected by that of the reheating zone part 6, so that the temperature profile within the reheating zone part 6 has only an insignificant effect on the compensating zone part 7.
  • Side wall burners 50 of conventional design are provided in the compensation zone part 7.
  • the flue gas from the outlet: partial zone part 7 is fed from the inlet end 52 of the equalizing zone part 7 to the furnace chamber of the reheating zone part 6. At the outlet-side end 53 there is a bottom opening which receives scale.
  • a temperature profile 55 can be set over its length, as shown in FIG. 5.
  • the temperature values entered in this figure represent the furnace lining temperature.
  • the highest temperature 56 occurs at the inlet end of the reheating zone part, it is approximately 1290 ° C. (at a drawing temperature of the continuous cast slabs of 1250 ° C.).
  • At the input opening 11 of the storage zone part 5 there is a temperature 57 of approximately 1200 ° C. corresponding to the average surface temperature of the heating material, and a temperature 58 of approximately 1260 ° C. at the outlet-side end 47 of the reheating zone part 6; A constant temperature of approximately 1250 ° C. is maintained over the length of the compensation zone part 7.
  • a temperature sensor 59 is provided in the flue gas outlet 48 of the reheating zone part for measuring the temperature of the extracted flue gas.
  • the temperature sensor 59 acts on a fire output controller 62 via a control circuit 60, which acts on a fuel gas control flap 63.
  • a fuel gas flow meter 64 is provided in the fuel gas Supply line 42 and in the combustion air supply line 43 there is a combustion air flow meter 65. Both the combustion air flow meter 65 and the fuel gas flow meter 64 give an input signal to a fuel / combustion air ratio controller 66, which in turn transmits an adjustment pulse to a combustion air control valve 67.
  • the amount of fuel gas and thus also the amount of combustion air is thus throttled or increased depending on the flue gas temperature.
  • the temperature sensor 59 acts on a fire output controller 62, which acts on a burner control unit 68.
  • This burner controller 68 closes or opens one or more of the high speed burners 38 and 46, i.e. the operating times or the operating cycles of individual or several high-speed burners 38, 46 are adjusted depending on the key, etc. by means of fuel gas quick-closing flaps 69 and fuel-air quick-closing flaps 70.
  • This embodiment is preferable for a larger required control range, since the stirring effect of the high-speed burners 38, 46 decreases with the square of the burner output.
  • the burners 50 of the compensating zone part 7 are regulated in a known manner, which is not shown here.
  • the burner 50 of the compensation zone part 7 is supplied by means of regulating flaps 71, 72 which are provided in the fuel gas or combustion air supply line 73, 74 leading to these burners 50.
  • a fuel gas quantity measuring device 75 or a combustion air quantity measuring device 76 is also located in these lines. The required combustion air is set via the control flaps 71, 72 after comparison of the quantity flows of the combustion air quantity and the fuel gas quantity.
  • the invention is not limited to the exemplary embodiment shown, but can also be modified in various respects.
  • the arrangement of the high-speed burners 38, 46 in the end wall 36 or in the side wall can also be selected depending on the requirements, for example a group of burners can also be dispensed with under certain circumstances.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP86890073A 1985-04-04 1986-03-20 Four à réchauffer et égaliser en température de l'acier chaud Withdrawn EP0198814A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0102285A AT381789B (de) 1985-04-04 1985-04-04 Nachwaermofen zum nachwaermen und zur temperaturvergleichmaessigung von heissem stahlgut
AT1022/85 1985-04-04

Publications (2)

Publication Number Publication Date
EP0198814A2 true EP0198814A2 (fr) 1986-10-22
EP0198814A3 EP0198814A3 (fr) 1987-05-27

Family

ID=3505037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890073A Withdrawn EP0198814A3 (fr) 1985-04-04 1986-03-20 Four à réchauffer et égaliser en température de l'acier chaud

Country Status (4)

Country Link
EP (1) EP0198814A3 (fr)
JP (1) JPS61231117A (fr)
CN (1) CN86102287A (fr)
AT (1) AT381789B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1788331A3 (fr) * 2005-11-21 2008-04-23 Novac Engineerig Système pour le transport de membres mécaniques traités par chauffage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010089566A (ko) 1998-12-25 2001-10-06 사또미 유따까 내상성(耐傷性)이 우수한 윤활피막 형성용 물계 금속표면처리 조성물
FR2853959B1 (fr) * 2003-04-18 2005-06-24 Stein Heurtey Procede de controle de l'homogeneite de temperature des produits dans un four de rechauffage de siderurgie, et four de rechauffage
FR2901868B1 (fr) * 2006-06-01 2009-03-06 Cmi Thermline Services Soc Par Four de rechauffage a zone de defournement perfectionnee
CN102851462B (zh) * 2012-08-14 2013-09-04 苏州汇科机电设备有限公司 热处理炉
CN110260651B (zh) * 2019-07-22 2024-06-18 镇江龙源铝业有限公司 一种用于铝带的连续加热装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923729A (en) * 1931-10-12 1933-08-22 Walter A Hull Tunnel kiln
FR2162511B1 (fr) * 1971-12-06 1983-11-10 Kawasaki Heavy Ind Ltd
DE2602070A1 (de) * 1976-01-21 1977-08-04 Hartmann & Braun Ag Verfahren zur regelung eines tunnelofens
DE2643406C3 (de) * 1976-09-27 1980-07-03 Haessler, Andreas, Ing.(Grad.), 7904 Erbach Tunnelofen mit Direktbefeuerung
DE2723626A1 (de) * 1977-05-25 1978-11-30 Chugai Ro Kogyo Kaisha Ltd Aufheizverfahren in einer heisswalzstrasse und nachwaermofen zur durchfuehrung des verfahrens
US4160641A (en) * 1977-09-15 1979-07-10 Holcroft & Company Continuous furnace
FR2405450A1 (fr) * 1977-10-07 1979-05-04 Welko Ind Spa Disposition de moufles d'etranglement dans les fours a rouleaux, en particulier pour matieres ceramiques
DD152851A1 (de) * 1980-08-27 1981-12-09 Wolfgang Bartz Hubbalkenofen mit oberheizung zur erwaermung langer knueppel
DE3310867A1 (de) * 1983-03-25 1984-10-04 Mannesmann AG, 4000 Düsseldorf Giesswalzanlage zum walzen von stranggiessmaterial
DE3322874C1 (de) * 1983-06-24 1984-10-11 Friedrich Wilhelm Dipl.-Ing. 7761 Moos Elhaus Anlage mit einem Durchlaufofen zum Anwaermen oder Waermebehandeln von Stranggussbarren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1788331A3 (fr) * 2005-11-21 2008-04-23 Novac Engineerig Système pour le transport de membres mécaniques traités par chauffage

Also Published As

Publication number Publication date
CN86102287A (zh) 1986-10-01
JPS61231117A (ja) 1986-10-15
ATA102285A (de) 1986-04-15
EP0198814A3 (fr) 1987-05-27
AT381789B (de) 1986-11-25

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