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WO2012080823A1 - Système d'alimentation en ferraille pour un four électrique à arc classique - Google Patents

Système d'alimentation en ferraille pour un four électrique à arc classique Download PDF

Info

Publication number
WO2012080823A1
WO2012080823A1 PCT/IB2011/003056 IB2011003056W WO2012080823A1 WO 2012080823 A1 WO2012080823 A1 WO 2012080823A1 IB 2011003056 W IB2011003056 W IB 2011003056W WO 2012080823 A1 WO2012080823 A1 WO 2012080823A1
Authority
WO
WIPO (PCT)
Prior art keywords
scrap
electric arc
arc furnace
shaft
shell
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.)
Ceased
Application number
PCT/IB2011/003056
Other languages
English (en)
Inventor
Klaus Von Ploetz
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.)
STG GROUP SpA
Original Assignee
STG GROUP SpA
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 STG GROUP SpA filed Critical STG GROUP SpA
Publication of WO2012080823A1 publication Critical patent/WO2012080823A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • F27D13/002—Preheating scrap
    • 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; Electric arc furnaces ; Tank furnaces
    • F27B3/06—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement
    • F27B3/065—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement tiltable
    • 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; Electric arc furnaces ; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; 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; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • F27B3/18—Arrangements of devices for charging
    • F27B3/183—Charging of arc furnaces vertically through the roof, e.g. in three points
    • F27B3/186—Charging in a vertical chamber adjacent to the melting chamber
    • 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
    • F27D17/10—Arrangements for using waste heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a scrap feeding system and, more particularly to a scrap feeding system able to be used to a conventional tiltable electric arc furnace.
  • the present invention also provides for controlling scrap feeding through an angled shaft into electric arc furnace; such angled shaft is connected to the electric arc furnace shell and supported through the platform allowing tilt movement thereof.
  • the conventional charging of an electric arc furnace is generally achieved by using a huge scrap bucket that involves some important problems for the electric arc furnace process such as generation of huge quantities of hot and dirty fumes and generation of flicker in the electrical network.
  • a continuous scrap feeding into electric arc furnace shell according to such process is generated through a big round opening in the off gas side of the shell. Through a horizontal conveyor system the scrap reaches the round opening and drops the scrap into the liquid bath. The whole electric arc furnace turns around the round shell opening thus allowing electric arc furnace tilting.
  • the process is based on a big hot metal sump by which the scrap is molten.
  • the electrical power is mainly used for heating up the liquid bath of metal sump and in such manner the flicker problem could be mostly solved.
  • the ECOARC ® furnace designed by NKK Corporation, integrates the vertical shaft as a fixed part of the electric arc furnace design. It allows a continuous feeding, the liquid metal is melting the scrap and therefore the flicker problem is reduced like in Consteel ® process.
  • this approach requires the electric arc furnace design to be dramatically changed. Different space arrangements are required and at the bottom of the shaft it is still required to change considerably the flow direction of the scrap for which reason a strong and sophisticated pusher system is needed; moreover it definitively adds friction wear to the shell refractory.
  • fig. 1 is a perspective view of a conventional electric arc furnace provided with a scrap feeding system according to the present invention
  • fig. 2 is a top view of the embodiment in fig. 1,
  • fig. 3 is a cross sectional view of the embodiment in fig. 1, and
  • figs. 4A and 4B show embodiment in its tilted end positions.
  • a conventional electric arc furnace 1 comprising a shell 3 and a roof 2 above it.
  • Said electric arc furnace 1 is supported by a tilt platform 5 constituted by a gantry side 5a and an extension 5b on the off gas side which forms the base of a scrap feeding system, in turn, comprising an angled shaft 9 and a scrap preheating system 8 connected therewith.
  • Tilt platform 5 is supported and driven by a set of foundations 6 and rockers 6a.
  • the embodiment therefore enlarges design of the electric arc furnace 1 with integrated scrap preheating system 8 that is based on the common tilt platform 5. This is the best option in order to always guaranty an airtight connection between the shell system 3 and the shaft 9. Moreover the use of the scrap preheating system 8 that is based on an angled shaft solution 9 allows for avoiding any mayor change in direction for the flow of the scrap into the shell section 3. Another option in order to improve the scrap preheating efficiency for the shaft section is to base the cooling system for this section on hot water or steam. Especially the common tilt platform supports such a solution. A controlled flow of the scrap into a liquid pool 4 of molten steel within shell 3 is important in order to reduce electrical flicker during the process of scrap melting.
  • the entrance of the shaft 9 into the shell 3 is controlled through a special combination of near vertical fingers 10 and near horizontal pushers 11 for pushing the scrap in a controlled manner into the liquid bath 4.
  • An optional rotary pusher system 17 can help to improve the control of the scrap movement through the shaft 9.
  • the fingers 10 are located in the top side of the shaft 9 controlling the top part of the opening between the section of shell 3 and section of the shaft 9.
  • the system of near horizontal pusher 11 is located behind the bottom part of the shaft entrance into the section of shell 3.
  • the shaft 9 is designed as part of a duct system 7 for collecting the hot off gases generated by the electric arc furnace process. This allows to use part of the energy of these hot gases for preheating the scrap fed through the shaft 9.
  • a special box system 12 allows to charge the shaft 9 without opening the shaft 9 and off gas duct system 7 to the surrounding atmosphere: a special scrap bucket 13 is designed to become part of the system 12 in order to achieve the fast and air tight recharging practice.
  • said scrap bucket 13 can be used only during charging step thus not being fixed part of system 12.
  • the main off gas quantity will leave the shaft 9 in an elevation considerable below the top charging box 12 at an off take point will which ensures that off gas temperature is high enough in order to avoid the creation of dioxin and furan.
  • the off gas are then collected in a near vertical duct section 15.
  • the transition point between the section of duct 15 based over tilt platform 5 and the section of grounded duct 16 is just below the tilt platform 5.
  • the top elevation of the rockers [6a?] is the point where the transition from the movable duct section 15 and the stationary off gas section of grounded duct 16 becomes a minimum. A permanent sealing of this transition is best possible in this location.
  • An optional separate duct system 14 around the angled shaft 9 allows some of the off gases to bypass the bottom section of the scrap feeding shaft 9 and enter, through an air intake 14a, direct into the charging box 12. These gas will preheat the scrap that was charged last.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Discharge Heating (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne un système d'alimentation pour un four électrique à arc inclinable classique comprenant une extension de portique de four sur le côté de l'enveloppe formée par l'ouverture d'échappement des effluents gazeux. Cette extension est la base d'un tuyau incliné raccordé de façon étanche à ladite ouverture et intégré au four lors de son mouvement d'inclinaison. L'alimentation se produit grâce à un chargement continu de ferraille au niveau de l'extrémité supérieure du tuyau incliné : lors de son mouvement vers le bas, la ferraille est préchauffée par les effluents gazeux sortant de ladite ouverture de l'enveloppe.
PCT/IB2011/003056 2010-12-15 2011-12-13 Système d'alimentation en ferraille pour un four électrique à arc classique Ceased WO2012080823A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2010A002291 2010-12-15
ITMI2010A002291A IT1403104B1 (it) 2010-12-15 2010-12-15 Sistema di alimentazione del rottame per un tradizionale forno ad arco elettrico

Publications (1)

Publication Number Publication Date
WO2012080823A1 true WO2012080823A1 (fr) 2012-06-21

Family

ID=43736946

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/003056 Ceased WO2012080823A1 (fr) 2010-12-15 2011-12-13 Système d'alimentation en ferraille pour un four électrique à arc classique

Country Status (2)

Country Link
IT (1) IT1403104B1 (fr)
WO (1) WO2012080823A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2682700A1 (fr) * 2012-07-03 2014-01-08 Steb S.r.l. Installation de production d'acier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000070285A1 (fr) * 1999-05-18 2000-11-23 Danieli Technology, Inc. Four a arc electrique a chargement continu en matieres ferreuses et coulee semi-continue de metal en fusion
WO2005052196A2 (fr) * 2003-11-27 2005-06-09 Danieli & C. Officine Meccaniche Spa Methode et installation de prechauffage, de transformation et de fusion d'une charge metallique
DE102009016774A1 (de) * 2009-04-07 2010-10-14 Fuchs Technology Holding Ag Chargiervorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000070285A1 (fr) * 1999-05-18 2000-11-23 Danieli Technology, Inc. Four a arc electrique a chargement continu en matieres ferreuses et coulee semi-continue de metal en fusion
WO2005052196A2 (fr) * 2003-11-27 2005-06-09 Danieli & C. Officine Meccaniche Spa Methode et installation de prechauffage, de transformation et de fusion d'une charge metallique
DE102009016774A1 (de) * 2009-04-07 2010-10-14 Fuchs Technology Holding Ag Chargiervorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2682700A1 (fr) * 2012-07-03 2014-01-08 Steb S.r.l. Installation de production d'acier

Also Published As

Publication number Publication date
ITMI20102291A1 (it) 2012-06-16
IT1403104B1 (it) 2013-10-04

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