EP0515249A1 - Partielle Dichtungsanordnung zwischen der Innerseite und Aussenseite von einem Lichtbogenofen - Google Patents

Partielle Dichtungsanordnung zwischen der Innerseite und Aussenseite von einem Lichtbogenofen Download PDF

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Publication number
EP0515249A1
EP0515249A1 EP92401323A EP92401323A EP0515249A1 EP 0515249 A1 EP0515249 A1 EP 0515249A1 EP 92401323 A EP92401323 A EP 92401323A EP 92401323 A EP92401323 A EP 92401323A EP 0515249 A1 EP0515249 A1 EP 0515249A1
Authority
EP
European Patent Office
Prior art keywords
hollow element
electrode
opening
furnace
gas
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Withdrawn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
EP92401323A
Other languages
English (en)
French (fr)
Inventor
Robert Adam
Thierry Bernet
Jean-Dominique Marchal
Daniel Pernet
Raoul Roth
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 EP0515249A1 publication Critical patent/EP0515249A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F27D99/0075—Gas curtain 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/12—Arrangements for cooling, sealing or protecting electrodes
    • 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
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces

Definitions

  • the present invention relates to a device ensuring improved partial sealing between an electrode of an electric arc furnace and the roof of the furnace.
  • Electric arc furnaces used in particular in the steel industry, have a vault provided with passages each crossed by an electrode.
  • the electrodes are mounted to be displaceable longitudinally in the passages.
  • the electrodes being relatively fragile and subjected to uncontrolled transverse vibrations, the walls delimiting the passages are relatively distant from the external surface of the associated electrode to avoid any contact between the electrode and said walls, contact which deteriorates the electrode.
  • Such a spacing between the walls of the passage and the electrode constitutes an important area of communication between the interior of the furnace and the ambient atmosphere.
  • a device ensuring the protection of the electrodes of an electric arc furnace and limiting the gas exchange between the interior and the exterior of the furnace, is for example described in the Utility Certificate FR - 2 360 858.
  • the present invention aims to provide a device ensuring a partial seal between the inside and the outside of an electric arc furnace, the structure of which is simple and which is easy to implement.
  • the present invention relates to a device for reducing gas exchange between the inside and the outside of an arc furnace comprising a vault having at least one opening, an electrode axially passing through the opening, a passage delimited between the wall of the opening and the electrode, characterized in that it comprises a hollow element placed on a horizontal flat external surface of the furnace perpendicular to the axis of the electrode and constituting the external end of the opening, the hollow element surrounding the electrode with an annular clearance determined and able to move freely on said outer surface.
  • Figure 1 there is shown the upper part of the roof 2 of an electric arc furnace of the tilting type, commonly used in the steel industry.
  • the vault 2 has an opening 4 with a vertical axis X-X delimited by a part of the vault forming a vault 6 having a flat horizontal upper face 8, forming the outer end face of the opening 4.
  • the electrode 10 is mounted so as to be able to move axially by means known per se, to ensure correct operation of the furnace.
  • the diameter of the outer surface 12 of the electrode 10 is significantly smaller than the diameter of the opening 4, and with the latter delimits a relatively large annular passage 14.
  • the annular passage 14 must be such that when the electrode 12 is subjected to radial vibrations, the electrode does not come into contact with the wall delimiting the opening 4, which would damage it or even break it.
  • the annular passage 14 being relatively large allows the flow of a high gas flow between the interior 16 and the exterior 18 of the oven, flow which it is necessary to reduce to ensure the proper functioning of the oven.
  • the oven is equipped with a partial sealing device which includes an annular hollow element 20.
  • the annular hollow element 20 is placed in freely sliding support on the upper face 8 of the roof, coaxially with the electrode 10, with between it and the element 20 an annular clearance 22 reduced.
  • the hollow element 20 comprises a sleeve 21 directed towards the interior 16 of the furnace, and delimiting around the electrode 10 an annular space of dimension substantially equal to the annular clearance 22 and intended to increase the pressure losses during the passage of gases to the outside of the furnace.
  • the hollow element 20 comprises two radial annular plates 26 and 28 which are parallel and axially spaced apart from each other, the externally radial peripheries of the plates 26 and 28 being connected by a sleeve 30 of axis XX.
  • the internally radial peripheries 32 and 34 of the plates 26 and 28 respectively have the same diameter, the latter being slightly greater than the diameter of the external surface 12 of the electrode 10, and significantly smaller than that of the opening 4 of the furnace.
  • the space existing between the plates 26 and 28 comprises radial partitions 36 regularly distributed on the internal surface 38 of the sleeve 30.
  • the partitions 36 are fixed by welding to the internal surface 38 of the sleeve 30.
  • partitions 36 can also be welded on one of the plates 26 or 28, or on both.
  • the internally radial end 40 of the partitions 36 is located between the plates 26 and 28, that is to say axially set back towards the sleeve 30 relative to the peripheries 32 and 34 of the plates 26 and 28 respectively, so that the partitions are not damaged in the event of contact between the hollow element and the electrode in the absence of the stops 24 or during the handling of the elements prior to their establishment.
  • the partitions 36 thus delimit compartments 42 open on their face intended to be opposite the electrode 10.
  • the compartments 42 thus constitute a baffle creating pressure losses in the flow of gases entering or leaving the oven, which, added to the small annular clearance 22, will considerably reduce the gas exchange between the interior 16 and the exterior. 18 from the oven.
  • the hollow element 20 being of light construction and simply placed on the surface 8, will slide on the latter when the electrode 10 is subjected to radial vibrations.
  • the gas contained in the hollow element 20 and the annular space 22 is compressed in the direction of the radial vibration of the electrode and repels the hollow element 20, so that the annular space 22 remains substantially constant, thus avoiding contact of the electrode 10 with the hollow element 20.
  • the hollow element 20 is made, preferably of metal, for example of non-magnetic stainless steel so as to limit the creation within it of eddy currents due to the intense magnetic fields created in the vicinity of the electrodes. These eddy currents would heat it up and lead to its rapid deterioration.
  • FIGS. 4 and 5 show another embodiment of a hollow element 20, in which the externally radial periphery of the latter is open and opens into an annular ring 50.
  • the annular crown 50 consists of two annular plates 52 and 54 arranged in the extension annular plates 26 and 28 respectively, the externally radial periphery of the plates 52 and 54 being closed by a cylindrical wall 56, coaxial with the hollow element 20.
  • the annular plates 52 and 54 of the crown may have come in one piece with the plates 26 and 28 respectively of the hollow element 20.
  • the cylindrical wall 56 is pierced with an orifice 58 connected to a pipe 60 for supplying gas under pressure.
  • This gas can therefore circulate in the compartments in the direction of the electrode 10. Its role is to improve the insulation between the oven and the outside air, and to cool the hollow element 20.
  • the gas can be blown directly into each or at least several of the compartments 42 by nozzles passing through the sleeve 30.
  • the pressurized gas is a neutral gas.
  • the partitions 36 of the hollow element 20 are profiled so as to constitute blades, for directing the neutral gas entering the ring 50, through the compartments 42, so such that these gas flows are inclined on the axis XX along the arrow F.
  • the partitions 36 can also be straight as in the example previously described.
  • partitions profiled in blades can also be used when gas is not blown into the hollow element 20. They offer a larger contact surface than straight partitions and therefore create more pressure drop .
  • FIGs 6 and 7 there is shown the arrangement of a hollow element 20 on an oven, the opening through which extends the electrode 10 is constituted on the one hand by an orifice 62 of the roof 6 and on the other hand by an annular plate 64.
  • the annular plate 64 is arranged parallel to the outer surface 8 of the roof top 6 and separated from the latter.
  • the annular plate 64 has an internal diameter substantially equal to the diameter of the orifice 62, and its periphery is fixed to the oven using a sleeve 66 of axis X-X.
  • the annular plate 64, the sleeve 66, and the wall of the furnace delimit an area into which gas can be blown under pressure.
  • the hollow element 20 is placed on the external face 8 of the roof 6.
  • the hollow element 20 is placed on the outer surface 70 of the annular plate 64.
  • the hollow element 20 according to the invention makes it possible to significantly reduce the communication between the interior and the exterior of the oven, between which a relative seal is thus ensured.
  • the gas exchanges were reduced using a hollow element, arranged according to FIGS. 1 and 2, the diameter of the internally radial periphery (32, 34) is 622 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP92401323A 1991-05-22 1992-05-14 Partielle Dichtungsanordnung zwischen der Innerseite und Aussenseite von einem Lichtbogenofen Withdrawn EP0515249A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106170 1991-05-22
FR9106170A FR2676799A1 (fr) 1991-05-22 1991-05-22 Dispositif d'etancheite partielle entre l'interieur et l'exterieur d'un four a arc.

Publications (1)

Publication Number Publication Date
EP0515249A1 true EP0515249A1 (de) 1992-11-25

Family

ID=9413012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401323A Withdrawn EP0515249A1 (de) 1991-05-22 1992-05-14 Partielle Dichtungsanordnung zwischen der Innerseite und Aussenseite von einem Lichtbogenofen

Country Status (4)

Country Link
EP (1) EP0515249A1 (de)
JP (1) JPH0688680A (de)
KR (1) KR920021960A (de)
FR (1) FR2676799A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100030824A1 (it) * 2021-12-07 2023-06-07 Danieli Off Mecc Forno elettrico ad arco per la fusione di materiale metallico ed impianto siderurgico comprendente detto forno elettrico ad arco

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3634977A1 (de) * 1985-10-14 1987-04-16 Fuji Kiko Kk Anordnung zur neigung eines lenkrades mittels einer hilfsantriebskraft
DE19529924C1 (de) * 1995-08-01 1996-10-31 Mannesmann Ag Lichtbogenofen und Verfahren zur Vermeidung von Überhitzungen der Ofenwand
FI123373B (fi) 2008-06-06 2013-03-15 Outotec Oyj Tiivistyslaite
KR101917594B1 (ko) * 2012-10-24 2018-11-13 재단법인 포항산업과학연구원 전극홀 간극 차단장치
CN115127353A (zh) * 2022-06-15 2022-09-30 中冶赛迪工程技术股份有限公司 一种长寿命横向风冷直流电弧炉底电极

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB130678A (en) * 1918-03-12 1919-08-14 Theodore Henry Eickhoff Improvements in the Breech Mechanism of Firearms.
GB1332928A (en) * 1970-11-20 1973-10-10 Belousov A A Controlled-atmosphere furnace with gas seal
EP0080335A1 (de) * 1981-11-20 1983-06-01 Coated Electrodes Limited Vorrichtung zum Abdichten der Elektroden eines Elektrolichtbogenofens
EP0437037A2 (de) * 1989-12-11 1991-07-17 Foseco International Limited Verfahren und Vorrichtung zum Abdichten der Spalte zwischen Elektrode und Deckel bei einem Elektroofen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB130687A (en) * 1918-03-14 1919-08-14 Colin Clarence Gow Improvements relating to the Mounting of Electrodes of Electric Furnaces.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB130678A (en) * 1918-03-12 1919-08-14 Theodore Henry Eickhoff Improvements in the Breech Mechanism of Firearms.
GB1332928A (en) * 1970-11-20 1973-10-10 Belousov A A Controlled-atmosphere furnace with gas seal
EP0080335A1 (de) * 1981-11-20 1983-06-01 Coated Electrodes Limited Vorrichtung zum Abdichten der Elektroden eines Elektrolichtbogenofens
EP0437037A2 (de) * 1989-12-11 1991-07-17 Foseco International Limited Verfahren und Vorrichtung zum Abdichten der Spalte zwischen Elektrode und Deckel bei einem Elektroofen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100030824A1 (it) * 2021-12-07 2023-06-07 Danieli Off Mecc Forno elettrico ad arco per la fusione di materiale metallico ed impianto siderurgico comprendente detto forno elettrico ad arco
WO2023105541A1 (en) * 2021-12-07 2023-06-15 Danieli & C. Officine Meccaniche S.P.A. Electric arc furnace for melting metal material and steel plant comprising said electric arc furnace

Also Published As

Publication number Publication date
FR2676799A1 (fr) 1992-11-27
JPH0688680A (ja) 1994-03-29
KR920021960A (ko) 1992-12-19

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