EP0578596A1 - Ofen, insbesondere elektrische Ofen für die Behandlung von geschmolzen Metallen - Google Patents

Ofen, insbesondere elektrische Ofen für die Behandlung von geschmolzen Metallen Download PDF

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Publication number
EP0578596A1
EP0578596A1 EP93470012A EP93470012A EP0578596A1 EP 0578596 A1 EP0578596 A1 EP 0578596A1 EP 93470012 A EP93470012 A EP 93470012A EP 93470012 A EP93470012 A EP 93470012A EP 0578596 A1 EP0578596 A1 EP 0578596A1
Authority
EP
European Patent Office
Prior art keywords
tank
peripheral edge
vault
oven according
extension
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Withdrawn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
EP93470012A
Other languages
English (en)
French (fr)
Inventor
Jacques Blum
François Heckel
Jacques Le Goff
Daniel Pernet
Dominique Rocchi
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.)
Unimetal SA
Original Assignee
Unimetal 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 Unimetal SA filed Critical Unimetal SA
Publication of EP0578596A1 publication Critical patent/EP0578596A1/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Withdrawn legal-status Critical Current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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F27D1/1816—Removable covers specially adapted for arc furnaces
    • 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/003—Extraction of waste gases, collection of fumes and hoods used therefor of waste gases emanating from an electric arc furnace
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
    • F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water

Definitions

  • the present invention relates to an oven, in particular an electric furnace for processing liquid metal.
  • the floating vault can be lifted and moved in order to load the oven, especially with scrap metal.
  • the vault is replaced on top of the tank.
  • a sealing device has therefore been proposed between the tank and the floating roof comprising a flexible refractory material disposed on the edge of the opening of the tank. This flexible refractory material returns to its initial shape when the arch is raised.
  • the junction edges of the floating vault and the tank are delimited by substantially flat and horizontal surfaces.
  • the plan-to-plan contact is unfavorable for sealing.
  • when loading the scrap tank are deposited on the flat edge of the opening of the tank, which affects the tightness of the oven when the vault is replaced on the tank.
  • the object of the invention is to remedy these drawbacks and to improve the seal between the tank and the floating roof of an oven, in particular an electric oven used in the steel industry.
  • the subject of the invention is an oven, in particular an electric furnace for processing liquid metal, comprising a tank closed by a floating vault and sealing means between the vault and the tank, characterized in that the means d 'sealing include two contiguous surfaces in direct contact arranged one on the peripheral edge of the vault and the other on the peripheral edge of the tank, a first surface being substantially toric and the second surface being substantially frustoconical.
  • FIG. 1 shows an electric arc furnace according to a first embodiment of the invention, designated by the general reference 10.
  • This furnace 10 is used for example in the steel industry for the production of steels.
  • the oven 10 comprises a tank 12, containing liquid metal 14, closed in its upper part by a floating vault 16.
  • the tank 12 has a bottom 17 and a substantially cylindrical shell 18, of axis X.
  • the wall of the tank 12 has a metal carcass 19 coated on its internal surface with a refractory material 20.
  • the peripheral edge 21 of the tank 12 is delimited by a removable annular extension 22 bearing on the upper edge of the ferrule 18.
  • the extension 22 is hung on the tank 12 by devices which are shown in more detail in FIG. 2 and which will be described later.
  • the extension 22 is delimited by metal walls and can consist of a single annular element, as shown in FIG. 1, or of several contiguous elements forming sectors.
  • the upper edge of the metal carcass 19 has a circular channel 28 filled with sand 30.
  • the internal wall of the ferrule 18 comprises, in its part located above the level of liquid metal 14, cooled panels 32. These panels 32 have a shape box and contain coolant, for example, water.
  • the panels 32 are fixed in the tank 12 by known means, and can be removed from the tank by lifting them upwards, considering FIG. 1, after removing the riser 22, as will be described later.
  • the riser 22 includes two annular cooling chambers 22A, 22B, arranged one above the other. These chambers 22A, 22B contain a cooling liquid, for example water, circulating in the chambers in opposite directions.
  • a cooling liquid for example water
  • the annular chambers 22A, 22B are connected to cooling liquid supply circuits, of known type, not shown in the figures.
  • the extension 22 has a substantially triangular section in an axial plane of the tank containing the axis X.
  • the upper edge of the ferrule 18 and the base 34 of the extension bearing on this edge have a substantially planar shape.
  • the inclined surfaces 38, 40 of the extension 22 have a generally substantially frustoconical shape.
  • a first inclined surface 38, oriented towards the inside of the tank, is carried by an imaginary cone of which there is shown, in phantom, a generator C1 in FIG. 1.
  • the top of this cone C1 is located under the peripheral edge 21 of tank 12.
  • the second inclined surface 40 oriented towards the outside of the tank 12, is carried by an imaginary cone of which there has been shown, in phantom, a generator C2 in FIG. 1.
  • the top of this cone C2 is located above from the peripheral edge 21 of the tank 12.
  • the extension 22 includes an annular skirt 39, integral with its base 34, projecting perpendicularly at this base.
  • the skirt 39 is pressed into the sand 30 so as to form a seal between the ferrule 18 and the extension 22.
  • the arch 16 has a peripheral edge 43 bearing on the extension 22.
  • the edge 43 of the roof has an annular chamber 43A for circulation of a cooling liquid, for example water.
  • the chamber 43A is connected to a cooling liquid supply circuit, of known type.
  • the chamber 43A can possibly form a coolant collector connected to radial cooling conduits, not shown in the figures, arranged in the roof 16.
  • the edge 43 of the arch 16 is delimited by a substantially toric external surface 44. This surface 44 is in direct contact with the substantially frustoconical surface 40 of the extension 22.
  • the contiguous surfaces 40, 44 ensure the seal between the roof 16 and the tank 12.
  • the latter comprises radial projections 45 or cradles distributed around its outer periphery, substantially in the same transverse plane with respect to the axis X of the tank 12.
  • the free ends of the cradles 45 are bent towards the top of the tank 12.
  • the extension 22 includes four cradles 45 spaced apart by 90 ° along its outer periphery.
  • the vault 16 has three orifices through which are disposed vertical electrodes, not shown in the drawings, and a fourth orifice 46 for the evacuation of the fumes contained in the oven.
  • the orifice 46 is connected to a nozzle 48, integral with the roof 16, projecting outside the furnace.
  • the nozzle 48 is fixed to the roof 16 of the oven by known means, for example by a weld bead 50.
  • the free end 52 of the nozzle 48 is connected to one end 54 of a duct 56 connected to smoke extraction means of the known type, not shown in the figures.
  • the section of the nozzle 48 and of the conduit 56 is substantially rectangular.
  • Sealing means 58 are arranged between the junction ends 52, 56 of the nozzle 48 and the conduit 56.
  • the means 58 comprise a seal 60 of flexible refractory material substantially covering its initial shape after being compressed.
  • the seal 60 is partially housed in a channel 62 carried by the junction end 52 of the nozzle.
  • the channel 62 has a substantially rectangular shape and extends along the contour of the junction end 52 of the nozzle.
  • the seal 60 is fixed in the channel 62 by means of removable fasteners 64, of known type, passing right through the side walls of the channel 62 and the seal 60.
  • the seal 60 projects outside the channel 62 so as to be in sealed contact against the junction end 54 of the conduit 56.
  • the seal 60 comprises a rope braided in glass fibers of substantially rectangular section.
  • the junction ends 52, 54 of the nozzle and of the duct include chambers 52A, 54A which are substantially annular, intended for the circulation of a coolant, for example water.
  • the chambers 52A, 54A are connected to a cooling circuit of known type, not shown in the figures.
  • the conduit 56 comprises means for moving in horizontal translation, not shown in the figures, intended to bring it closer or to move it away from the junction end 52 of the nozzle.
  • FIG. 2 shows a device 66 connecting the tank 12, the extension 22 and the roof 16 together.
  • the oven 10 comprises several devices 66, for example four in number, regularly spaced along the periphery of the oven.
  • the device 66 comprises a connecting device 68 connecting the vault 16 and the riser 22 to one another and a connecting device 70 connecting the riser 22 and the tank 12 to each other.
  • the device 68 comprises a strap 72 connecting a radial rib 74 secured to the roof 16 to a fitting 76, secured to the extension 22, extending radially outside the tank 12.
  • the ends of the strap 72 are connected, one to the rib 74 and the other to the fitting 76, by means of removable pins 78.80.
  • the device 70 comprises a radial tab 82, integral with the tank 12, projecting outside the latter, connected by a removable pin 84 to a curved end of the fitting 76.
  • the smoke suction duct 56 is moved so as to move it away from the junction end 52 of the nozzle 48.
  • the removable pins 78 are removed from the straps 72 so as to free the arch 16 from the riser 22, by folding the straps 72 by pivoting around the pins 80.
  • the arch 16 is then moved by lifting it, for example by means of a lifting bracket.
  • the tank 12 can be loaded.
  • the tank 12 can be loaded, for example, with scrap metal.
  • the triangular section of the riser prevents scrap metal from settling on the peripheral edge of the tank during loading.
  • the floating vault 16 is moved so as to bring it in line with the riser 22.
  • the toric surface 44 of the edge 43 of the arch fits onto the frustoconical surface 40 of the extension 22.
  • the frustoconical surface 40 cooperating with the toric surface 44 ensures good centering of the vault 16 relative to the axis X of the tank 12.
  • the place of contact of the toric surface 44 and the frustoconical surface 40 roughly defines a circular line.
  • the contact pressure on this circular line is high, which makes it possible to obtain a sealed junction between the roof 16 and the tank 12.
  • junction end 52 of the nozzle 48 is substantially opposite the junction end 54 of the duct 56.
  • the cradles 45 are spaced apart in height from the edge 43 of the roof by a slight clearance.
  • the smoke suction duct 56 is then moved to be brought into contact with the seal 60 carried by the nozzle 48.
  • the seal between the nozzle 48 and the duct 56 is ensured by compressing the seal 60 against the junction end 54 of conduit 56.
  • the connecting devices 68 make it possible to jointly move the vault 16 and the riser 22, in particular when it is desired to replace the cooled panels 32.
  • the riser is connected to the vault by the straps 72 and the pins 78 and the pins 84 are removed connecting each fitting 76 to the corresponding tab 82.
  • the extension 22 is simply placed on the tank 12 and is attached to the roof 16 by the devices 68.
  • the riser 22 is jointly moved, which then makes it possible to pull the cooled panels 32 upwards from the tank, using lifting means of known type.
  • the extension 22 only has a single chamber 22C for the circulation of a cooling liquid.
  • the extension 22 includes a resilient metal membrane 86 disposed at the junction area of the extension 22 with the peripheral edge 43 of the arch 16.
  • the metal membrane 86 is fixed to the extension 22 by means of known type.
  • the metal membrane 86 is liable to deform under the effect of the pressure of the cooling liquid circulating in the chamber 22C.
  • the metal membrane 86 is slightly curved towards the interior of the chamber 22C as shown in FIG. 3.
  • the metal membrane 86 is deformed so as to be applied against the edge 43 of the arch 16 while being curved towards the outside of the riser 22, as shown in Figure 4.
  • the surface 40 of the extension 22 has a generally frustoconical shape and the flexibility of the membrane allows the latter to adapt as best as possible to the toric surface of the edge 43, in the event of slight deformations thereof. .
  • FIG. 5 shows another embodiment of the riser 22.
  • the riser 22 has a section along an axial plane of the tank in the shape of a right triangle.
  • the surface 38 of the riser oriented towards the inside of the tank is substantially vertical, and the surface 40 of the riser oriented towards the outside of the tank is substantially frustoconical.
  • the toric surface 44 of the edge 43 of the roof rests on the frustoconical surface 38 of the riser oriented towards the inside of the tank.
  • an extension 22 having a substantially semi-circular section in an axial plane of the tank.
  • the peripheral edge of the arch 16 rests on the toric surface 88 of the extension 22.
  • the extension 22 comprises a single chamber 22C for circulation of a coolant.
  • the peripheral edge 89 of the roof 16 comprises a skirt 90, the surface 92 of which in contact with the extension 22 is substantially frustoconical.
  • the surface 92 is carried by an imaginary cone, a generator C3 of which is shown in dashed lines in FIG. 7.
  • the top of this cone C3 is situated substantially below the peripheral edge 89 of the vault.
  • the peripheral edge 93 of the roof 16 comprises a skirt 94, the surface 96 of which in contact with the extension 22 is substantially frustoconical.
  • the surface 96 is carried by an imaginary cone of which there is shown, in phantom, a generator C4 in FIG. 8.
  • the top of this cone C4 is situated substantially above the peripheral edge 93 of the vault.
  • FIG. 8 also shows cradles 42 for guiding the vault 16 when it is placed on the riser 22.
  • the extension 22 may have come in one piece with the tank 12.
  • the cooling water circulation chambers of the riser and the peripheral edge of the arch can be omitted.
  • the devices connecting the vault to the riser and the devices connecting the riser to the tank can be eliminated or replaced by other equivalent devices.
  • the invention has many advantages.
  • the extension being delimited by frustoconical or toric external surfaces, there is no accumulation of material, in particular of scrap, on the edge of junction of the riser with the roof, when loading the oven.
  • the frustoconical and toric contiguous surfaces make it very easy to center the vault with respect to the axis of the oven bowl and optimize the seal between the riser and the vault.
  • the seal placed between the nozzle and the smoke extraction duct can be replaced quickly and often, which makes it possible to maintain a good seal at all times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP93470012A 1992-07-06 1993-06-11 Ofen, insbesondere elektrische Ofen für die Behandlung von geschmolzen Metallen Withdrawn EP0578596A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9208327 1992-07-06
FR9208327A FR2693261B1 (fr) 1992-07-06 1992-07-06 Four, notamment four électrique, de traitement de métal liquide.

Publications (1)

Publication Number Publication Date
EP0578596A1 true EP0578596A1 (de) 1994-01-12

Family

ID=9431593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93470012A Withdrawn EP0578596A1 (de) 1992-07-06 1993-06-11 Ofen, insbesondere elektrische Ofen für die Behandlung von geschmolzen Metallen

Country Status (11)

Country Link
US (1) US5410565A (de)
EP (1) EP0578596A1 (de)
JP (1) JPH06213570A (de)
KR (1) KR940005939A (de)
AU (1) AU4171393A (de)
BR (1) BR9302762A (de)
CA (1) CA2099807A1 (de)
FR (1) FR2693261B1 (de)
HU (1) HUT68376A (de)
MX (1) MX9303997A (de)
PL (1) PL299393A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699885A1 (de) * 1994-09-02 1996-03-06 ABB Management AG Ofengefäss für einen Gleichstromlichtbogenofen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5887017A (en) * 1996-09-27 1999-03-23 Ucar Carbon Technology Corporation Panelized spray-cooled furnace roof
WO2010113189A1 (en) * 2009-03-31 2010-10-07 Sms Concast Italia S.R.L. Electric arc furnace
KR102077948B1 (ko) * 2018-12-20 2020-02-14 현대제철 주식회사 전기로용 루프 냉각장치

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE895300C (de) * 1942-08-20 1953-11-02 Mannesmann Huettenwerke A G Kuehlvorrichtung fuer Schmelzofendeckel, insbesondere fuer Lichtbogenoefen
DE1020557B (de) * 1951-12-21 1957-12-05 Heinrich Braukmann Rauchgasventil fuer Brennoefen der Grobkeramik
DE2357488A1 (de) * 1973-11-17 1975-05-22 Still Fa Carl Verschluss fuer horizontale verkokungsoefen mit zweifacher dichtung
US4630281A (en) * 1984-07-05 1986-12-16 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Arc furnace with variable capacity
GB2226627A (en) * 1988-12-30 1990-07-04 Wurth Paul Sa Device for reducing the stresses on a sealing shutter
DE3939383A1 (de) * 1989-11-29 1991-06-06 Btf Edelstahlverarbeitung Gmbh Kuehleinrichtung fuer dichtungsanordnungen von vorrichtungen zur waermebehandlung, insbesondere zum gluehen, von werkstuecken unter schutzgasatmosphaere
FR2665756A1 (fr) * 1990-08-13 1992-02-14 Siderurgie Fse Inst Rech Dispositif d'etancheite entre une cuve et une voute flottante d'un four industriel tel qu'un four electrique de traitement de metal liquide.
EP0472146A1 (de) * 1990-08-24 1992-02-26 Thyssen Still Otto Anlagentechnik GmbH Vorrichtung zum Abdichten der Schachteinfüllöffnung einer Kokstrockenkühlanlage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684392A (en) * 1952-03-13 1954-07-20 Delaware Engineering Corp Electric furnace and smoke and fume take-off therefor
US3576318A (en) * 1969-04-04 1971-04-27 Inductotherm Corp Fume control method and apparatus
JPS5655587Y2 (de) * 1978-04-20 1981-12-25
AT382014B (de) * 1981-09-15 1986-12-29 Voest Alpine Ag Plasmaschmelzofen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE895300C (de) * 1942-08-20 1953-11-02 Mannesmann Huettenwerke A G Kuehlvorrichtung fuer Schmelzofendeckel, insbesondere fuer Lichtbogenoefen
DE1020557B (de) * 1951-12-21 1957-12-05 Heinrich Braukmann Rauchgasventil fuer Brennoefen der Grobkeramik
DE2357488A1 (de) * 1973-11-17 1975-05-22 Still Fa Carl Verschluss fuer horizontale verkokungsoefen mit zweifacher dichtung
US4630281A (en) * 1984-07-05 1986-12-16 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Arc furnace with variable capacity
GB2226627A (en) * 1988-12-30 1990-07-04 Wurth Paul Sa Device for reducing the stresses on a sealing shutter
DE3939383A1 (de) * 1989-11-29 1991-06-06 Btf Edelstahlverarbeitung Gmbh Kuehleinrichtung fuer dichtungsanordnungen von vorrichtungen zur waermebehandlung, insbesondere zum gluehen, von werkstuecken unter schutzgasatmosphaere
FR2665756A1 (fr) * 1990-08-13 1992-02-14 Siderurgie Fse Inst Rech Dispositif d'etancheite entre une cuve et une voute flottante d'un four industriel tel qu'un four electrique de traitement de metal liquide.
EP0472146A1 (de) * 1990-08-24 1992-02-26 Thyssen Still Otto Anlagentechnik GmbH Vorrichtung zum Abdichten der Schachteinfüllöffnung einer Kokstrockenkühlanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 56 (C-331)(2113) 6 Mars 1986 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699885A1 (de) * 1994-09-02 1996-03-06 ABB Management AG Ofengefäss für einen Gleichstromlichtbogenofen
US5719897A (en) * 1994-09-02 1998-02-17 Asea Brown Boveri Ag Furnace vessel for a direct current arc furnace

Also Published As

Publication number Publication date
KR940005939A (ko) 1994-03-22
FR2693261A1 (fr) 1994-01-07
MX9303997A (es) 1994-04-29
PL299393A1 (en) 1994-01-24
BR9302762A (pt) 1994-02-08
AU4171393A (en) 1994-01-13
HUT68376A (en) 1995-06-28
FR2693261B1 (fr) 1994-09-23
CA2099807A1 (fr) 1994-01-07
JPH06213570A (ja) 1994-08-02
US5410565A (en) 1995-04-25
HU9301952D0 (en) 1993-09-28

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