EP3139120B1 - Toit delta à refroidissement amélioré pour des fours électriques de fusion - Google Patents

Toit delta à refroidissement amélioré pour des fours électriques de fusion Download PDF

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Publication number
EP3139120B1
EP3139120B1 EP16185997.0A EP16185997A EP3139120B1 EP 3139120 B1 EP3139120 B1 EP 3139120B1 EP 16185997 A EP16185997 A EP 16185997A EP 3139120 B1 EP3139120 B1 EP 3139120B1
Authority
EP
European Patent Office
Prior art keywords
delta
channels
delta roof
nozzles
roof
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.)
Not-in-force
Application number
EP16185997.0A
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German (de)
English (en)
Other versions
EP3139120A1 (fr
Inventor
Gian Luca Masnata
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Individual
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Individual
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Publication date
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Publication of EP3139120A1 publication Critical patent/EP3139120A1/fr
Application granted granted Critical
Publication of EP3139120B1 publication Critical patent/EP3139120B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/08—Heating by electric discharge, e.g. arc discharge
    • F27D11/10—Disposition of 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
    • F27B3/02—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces of single-chamber fixed-hearth type
    • 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
    • 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
    • F27B3/16—Walls; Roofs
    • 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
    • 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

Definitions

  • the present invention relates to an improved delta roof for electric smelting furnaces.
  • the present invention relates to a delta roof provided with an improved integrated cooling system for cooling the electrodes that conduct the melting process.
  • the present invention is mainly applicable in the iron and steel production field, in connection with the melting of iron scrap in electric smelting furnaces in which the roofs (delta) are utilised in such furnaces as closure elements.
  • the delta roofs are provided with through-holes, usually three in number, which act as channels for introducing the electrodes.
  • delta roofs As known, for reasons of transportability and movement of the delta roofs, these can be made as a single block of refractory material in the case of delta roofs of small dimensions, or as a plurality of independent but mutually complementary sectors, which will then be assembled at the mounting time in the steelworks.
  • EP-A 0029416 relates to a cooling panel for the roof of an electric furnace comprising channels for cooling fluid converging toward the electrode sleeve.
  • the aim of the present invention is to make an improved delta roof for electric smelting furnaces that is able to overcome the above-mentioned drawbacks of the prior art in a very simple, economical and particularly functional way.
  • a further aim is to make an improved delta roof for electric smelting furnaces in which the periodical cleaning of the nozzles for cooling the electrodes, or the replacement thereof, does not require removing the delta roof, interrupting the production cycle and in general working under dangerous conditions.
  • aims according to the present invention are attained by making a delta roof for electric smelting furnaces wherein channels are obtained directly in the refractory material, said channels converging from the outside in correspondence with the passages of the electrodes, wherein lances are housed in such channels in a sliding manner, said lances being provided with nozzles for cooling the electrodes.
  • these channels converge towards the passages of the electrodes substantially horizontally or with an inclination of less than 20° with respect to the horizontal.
  • Such a delta roof is at least partially made of refractory material and comprises at least one through-opening 15 for introducing from the outside an electrode for conducting the melting process.
  • the delta roof comprises a plurality of channels 18 obtained directly in the refractory material in such a way that from the outside of the delta roof they converge at the through-openings 15.
  • said channels 18 converge towards the passages 15 of the electrodes substantially horizontally or with an inclination of less than 20° with respect to the horizontal so as to be able to utilise the whole thickness of the refractory coating.
  • a lance 17 is arranged inside each channel 18 in a sliding manner, said lance 17 being independently supplied with a cooling fluid and being provided with nozzles 16.
  • nozzles 16 are arranged on the relative lance so as to face the electrodes for conducting the melting process when the lance is inserted in the channel 18. In case of cleaning or of need to remove a nozzle, it is sufficient to extract the relative lance from the delta roof, acting safely far away from the through-opening 15.
  • end-strokes and angular orientation elements configured for guaranteeing the correct positioning of the nozzles with respect to the electrodes to be cooled are provided.
  • At least two, preferably four, channels 18 are provided, so that, even removing a lance, at least another lance is in action with its nozzles on the relative electrode.
  • the lances will be positioned more or less retracted with respect to the passage itself in order to prevent the rapid deterioration thereof.
  • the accesses to the channels 18 are arranged laterally with respect to the delta roof and the inner walls of the openings are provided with holes 19 for the passage of cooling fluid from the nozzles to the electrodes.
  • the present invention allows preserving the refractory material for a longer time, increasing the number of casts per delta roof.
  • the temperature reaches about 1700-1800° Celsius, subjecting the refractory material to the melting limit thereof.
  • the above-described system also contributes cooling the refractory material itself.
  • the delta roof for electric smelting furnaces of the present invention on the one hand comprises cooling nozzles for cooling the electrodes and on the other hand does not require breaks in the production cycle for cleaning or removing them.
  • the delta roof for electric smelting furnaces of the present invention as it is conceived is susceptible to numerous modifications and variants, all falling within the same inventive concept; moreover, all the details can be replaced by technically equivalent elements.
  • the materials used, as well as the dimensions thereof, can be of any type according to the technical needs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Fuses (AREA)

Claims (6)

  1. Toit delta (10) pour fours électriques de fusion du type réalisé au moins partiellement en matériau réfractaire et comprenant au moins une ouverture passante (15) pour introduire un électrode pour conduire le processus de fusion de l'extérieur dans ledit four ; caractérisé en ce que ledit toit delta (10) comprend une pluralité de canaux (18) obtenus dans ledit matériau réfractaire, qui convergent de l'extérieur dudit toit delta au niveau de ladite au moins une ouverture passante (15), une lance (17) étant agencée d'une manière coulissante à l'intérieur de chacun desdits canaux (18), ladite lance (17) étant alimentée indépendamment avec un fluide de refroidissement et étant munie de buses (16), lesdites buses étant agencées sur ladite lance de manière à faire face auxdites électrodes pour conduire le processus de fusion quand ladite lance est insérée dans ledit canal (18).
  2. Toit delta selon la revendication 1 caractérisé en ce que lesdits canaux (18) comprennent des éléments de fin de course configurés pour garantir le positionnement correct des buses par rapport auxdites électrodes.
  3. Toit delta selon l'une quelconque des revendications précédentes caractérisé en ce que, pour chaque ouverture passante (15), au moins deux canaux (18) sont prévus, de préférence quatre.
  4. Toit delta selon l'une quelconque des revendications précédentes caractérisé en ce que les accès auxdites canaux (18) sont agencés latéralement audit toit delta et ont un développement sensiblement horizontal.
  5. Toit delta selon la revendication 4 caractérisé en ce que lesdits canaux (18) ont un développement sensiblement horizontal compris dans ±20° par rapport à l'horizontale.
  6. Toit delta selon l'une quelconque des revendications précédentes caractérisé en ce que les parois intérieures desdites ouvertures passantes sont munies de trous (19) pour le passage du fluide de refroidissement desdites buses aux électrodes.
EP16185997.0A 2015-08-27 2016-08-26 Toit delta à refroidissement amélioré pour des fours électriques de fusion Not-in-force EP3139120B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A003270A ITUB20153270A1 (it) 2015-08-27 2015-08-27 Voltino con raffreddamento perfezionato per forni fusori elettrici.

Publications (2)

Publication Number Publication Date
EP3139120A1 EP3139120A1 (fr) 2017-03-08
EP3139120B1 true EP3139120B1 (fr) 2018-08-01

Family

ID=55069950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16185997.0A Not-in-force EP3139120B1 (fr) 2015-08-27 2016-08-26 Toit delta à refroidissement amélioré pour des fours électriques de fusion

Country Status (4)

Country Link
EP (1) EP3139120B1 (fr)
ES (1) ES2693147T3 (fr)
IT (1) ITUB20153270A1 (fr)
TR (1) TR201815809T4 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1586353A (en) * 1978-02-28 1981-03-18 Korf Stahl Arc furnace cover
IT1126161B (it) * 1979-11-14 1986-05-14 Impianti Industriali Spa Piastra di raffreddamento per forni elettrici ad arco
US4674101A (en) * 1984-10-12 1987-06-16 Nippon Kokan Kabushiki Kaisha Arc-heating type extra-furnace refining apparatus
JP3066559B2 (ja) * 1994-04-18 2000-07-17 新日本製鐵株式会社 電気炉用水冷炉蓋
IT1310527B1 (it) * 1999-01-20 2002-02-18 Danieli Off Mecc Sistema di tamponamento della regione del delta della voltadi un forno elettrico ad arco
WO2009037649A2 (fr) * 2007-09-17 2009-03-26 Metix (Pty) Limited Voûte pour un four à arc électrique et son procédé de fabrication
US9464846B2 (en) * 2013-11-15 2016-10-11 Nucor Corporation Refractory delta cooling system

Also Published As

Publication number Publication date
ITUB20153270A1 (it) 2017-02-27
ES2693147T3 (es) 2018-12-07
EP3139120A1 (fr) 2017-03-08
TR201815809T4 (tr) 2018-11-21

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