EP0119909B1 - Ofen mit Hubbalken aus feuerfestem Material - Google Patents

Ofen mit Hubbalken aus feuerfestem Material Download PDF

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Publication number
EP0119909B1
EP0119909B1 EP84400468A EP84400468A EP0119909B1 EP 0119909 B1 EP0119909 B1 EP 0119909B1 EP 84400468 A EP84400468 A EP 84400468A EP 84400468 A EP84400468 A EP 84400468A EP 0119909 B1 EP0119909 B1 EP 0119909B1
Authority
EP
European Patent Office
Prior art keywords
products
recesses
beams
furnace
longitudinal
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
Application number
EP84400468A
Other languages
English (en)
French (fr)
Other versions
EP0119909A1 (de
Inventor
Michel Denis
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
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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0119909A1 publication Critical patent/EP0119909A1/de
Application granted granted Critical
Publication of EP0119909B1 publication Critical patent/EP0119909B1/de
Expired 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
    • 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
    • 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
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/203—Conveyor mechanisms therefor having ramps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids
    • F27D3/024—Details of skids, e.g. riders

Definitions

  • Ovens intended for continuous heating, before rolling of products such as billets or blooms are often with mobile beams.
  • a part of the sole is formed of fixed beams while the remaining part consists of mobile beams and has a circular or rectangular movement.
  • the products rest alternately on the fixed beams and on the mobile beams whose movement ensures the progression of these products.
  • the beams of these ovens can be hollow and cooled by water circulation. They can also be made of refractory material, which reduces the thermal consumption of the furnace, given the elimination of thermal losses from the cooled elements.
  • the products are heated mainly by the radiation from the furnace on their upper face and on their lateral faces.
  • Their lower face which is constantly in contact with the refractory hearth, is heated only by the thermal conduction coming from the other faces and, in most of the oven, is at a temperature lower than that of the rest of the product.
  • This temperature difference causes a difference in expansion of the upper and lower faces of the product, which causes it to bend in the vertical plane.
  • This bending is detrimental to the progression of the products on the floor; in fact, the bent products tend to tip over and then risk overlapping if the deflection of the bending is greater than the interval which separates two successive products.
  • the patent U. S. 1,400,367 describes an oven comprising a hearth provided with slots in which are engaged mobile beams separated by a fixed beam of width greater than that of the mobile beams.
  • the side walls of the slots open flues bringing the combustion gases; these circulate around the movable elements of the floor and prevent cold air from entering through the slits.
  • the combustion gases and the fumes exiting through slots which have a limited width cannot heat the underside of the products, therefore preventing their bending.
  • the side walls of the slots and those of the mobile side members are in contact with the fumes and dust they contain; this is a drawback given the relative movement of the walls of the slots and those of the side members.
  • the present invention relates to an oven with refractory beams, with higher heating, which on the contrary makes it possible to avoid practically any bending of the products.
  • This oven in which the fixed beams of the hearth have a width greater than that of the mobile beams and have recesses connected to the general smoke circuit, is characterized in that the recesses open onto the upper face of the beams being oriented in the direction longitudinal of these beams, and are framed by portions of the fixed beams of width less than that of said recesses or by the walls of the furnace, so that the fumes cross the bed of products overcoming them, pass under this bed by heating by radiation the underside of said products, and are then evacuated outside.
  • the recesses preferably have a decreasing depth in the direction of movement of the products. They thus have an increasing passage section with the direction of flow of the fumes, which compensates for their drop in temperature.
  • the recesses can have different depths, the depth of a recess being a function of its position relative to the longitudinal median plane of the furnace. Smoke flows are thus obtained under the products, therefore reheating the underside of these products, which depend on the place of said products relative to the axis of the oven. It is thus possible to compensate for an asymmetry in the heating of the oven.
  • the fixed longitudinal members may include longitudinal metal profiles capable of supporting the products and themselves supported by the lower frame of the oven.
  • the oven has a roof 1, side walls such as 2 and a front wall 3 and has a longitudinal median plane A-A. Its sole is formed of refractory fixed beams 4 separated by mobile refractory beams 5 whose width is less than that of the fixed beams. Burners, not shown, make it possible to circulate combustion gases against the current in the upper zone of the furnace, above the longitudinal members 4 and 5.
  • the fixed longitudinal members 4 are supported by metal profiles 6 known as “sole irons forming an integral part of the metallic framework of the furnace which is designated in the drawing generally by the reference 7.
  • the mobile longitudinal members 5 are on their side supported by crosspieces 8, which, together with the side members 9, constitute a movable frame.
  • This chassis is supported, by means of uprights 10, by a chassis 11 which rests on a frame 12 by means of rollers 13 and which a system of jacks, not shown, makes it possible to move longitudinally.
  • the frame 12 rests itself, by means of rollers 14 on fixed inclined planes 15 and can be moved longitudinally by a system of jacks also not shown.
  • the movable beams 5 are moved both longitudinally and vertically, while if the chassis 11 is moved, the movable beams 5 only move longitudinally.
  • the fixed rails 4 have recesses such as 17a and 17b whose depth decreases in the direction of progression of the products, that is to say in the direction of the arrow F in Figure 2.
  • the greatest depth of these recesses is therefore at the level of the oven.
  • the recess 17a located near the longitudinal median plane A-A has a shallower depth than the recess 17b.
  • the various recesses are connected to a manifold 18 by flues such as 19 which are supported by a frame 20 integral with the oven.
  • the fumes resulting from the combustion pass through the recesses 17a and 17b, therefore the bed of products to which they give up by convection part of their sensible heat. Then flowing under the bed, in the recesses, they radiate on the undersides of the products which are thus heated.
  • the depth of the recesses also varies as a function of their positions relative to the axis of the oven, it is possible to compensate for any asymmetry in the heating of the oven.
  • the underside of the products 16 is brought to practically the same temperature as their upper face and expands substantially by the same value.
  • the product hanger is eliminated or at least considerably reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)

Claims (4)

1. Ofen mit beweglichen Längsträgern mit Beheizung von oben, bei welchem die stationären Längsträger (4) der Sohle eine größere Breite als die beweglichen Längsträger (5) aufweisen und mit dem allgemeinen Kreislauf der Rauchgase verbundene Aussparungen (17a und 17b) besitzen, dadurch gekennzeichnet, daß die Aussparungen (17a und 17b) über der oberen Fläche der Längsträger (4) ausmünden, wobei sie in der Längsrichtung dieser Längsträger ausgerichtet sind, und daß sie durch Teile der stationären Längsträger mit geringerer Breite als die Breite dieser Aussparungen eingefaßt sind, oder auch durch die Wände des.Ofens dergestalt, daß die oberhalb der Produkte befindlichen Rauchgase die Auflage der Produkte durchströmen, unter diese Auflage gelangen, wobei sie durch Strahlung die untere Fläche dieser Produkte erhitzen, und dann nach außen abgeführt werden.
2. Ofen nach Anspruch 1, dadurch gekennzeichnet, daß die Aussparungen (17a und 17b) eine Tiefe aufweisen, welche in der Richtung der Verschiebung der Produkte abnimmt.
3. Ofen nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Tiefe der Aussparung (17a), welche der Längsmittelebene A-A am nächsten liegt, eine geringere Tiefe als die von dieser Ebene weiter entfernte Aussparung (17b) aufweist.
4. Ofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die die Aussparungen (17a und 17b) einfassenden Teile der stationären Längsträger (4) längsverlaufende Metallprofile (21) aufweisen, welche geeignet sind, die Produkte zu tragen, und selbst von dem unteren Gerüst des Ofens getragen sind.
EP84400468A 1983-03-11 1984-03-09 Ofen mit Hubbalken aus feuerfestem Material Expired EP0119909B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304263 1983-03-11
FR8304263A FR2542433B1 (fr) 1983-03-11 1983-03-11 Fours a longerons refractaires

Publications (2)

Publication Number Publication Date
EP0119909A1 EP0119909A1 (de) 1984-09-26
EP0119909B1 true EP0119909B1 (de) 1987-11-11

Family

ID=9286906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400468A Expired EP0119909B1 (de) 1983-03-11 1984-03-09 Ofen mit Hubbalken aus feuerfestem Material

Country Status (6)

Country Link
US (1) US4556385A (de)
EP (1) EP0119909B1 (de)
CA (1) CA1218844A (de)
DE (1) DE3467397D1 (de)
ES (1) ES286166Y (de)
FR (1) FR2542433B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8601467A (nl) * 1986-06-06 1988-01-04 Elten Nederland Transportinrichting.
IT1248166B (it) * 1991-05-21 1995-01-05 Danieli Off Mecc Forno a longheroni refrattari con caricamento centrale per riscaldo edaccumulo di prodotti caldi.
DE4119709A1 (de) * 1991-06-14 1992-12-17 Maerz Ofenbau Ofen fuer die waermebehandlung von stueckigem gut
DE4119708A1 (de) * 1991-06-14 1992-12-17 Maerz Ofenbau Gleichschrittofen fuer die waermebehandlung von stueckigem gut
US5370530A (en) * 1993-03-24 1994-12-06 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
US5362230A (en) * 1993-03-24 1994-11-08 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
US5334014A (en) * 1993-03-30 1994-08-02 Btu International Walking beam furnace

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1400367A (en) * 1919-09-10 1921-12-13 Harry P Mccann Furnace and method of conveying materials therethrough
US2325757A (en) * 1942-06-09 1943-08-03 Ehlers Edward Heating furnace
US3647194A (en) * 1970-06-01 1972-03-07 Bloom Eng Co Inc Protective refractory member
SE338580B (de) * 1970-11-04 1971-09-13 Tabougnar Ab
GB2009380B (en) * 1977-11-01 1982-03-31 Ce Refractories Ltd Frunaces and furnace components
DE2923540C3 (de) * 1979-06-09 1985-06-27 Karrena GmbH, 4000 Düsseldorf Rohrverkleidung für Rohre in Feuerungsräumen von Industrieöfen
JPS58105468U (ja) * 1982-01-13 1983-07-18 中外炉工業株式会社 アツプセツト付パイプの連続式熱処理炉

Also Published As

Publication number Publication date
ES286166Y (es) 1986-06-01
EP0119909A1 (de) 1984-09-26
FR2542433B1 (fr) 1988-01-29
ES286166U (es) 1985-11-01
DE3467397D1 (en) 1987-12-17
FR2542433A1 (fr) 1984-09-14
CA1218844A (fr) 1987-03-10
US4556385A (en) 1985-12-03

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