WO1987006332A1 - Dispositif pour la fabrication d'acier, avec agitation inductive - Google Patents

Dispositif pour la fabrication d'acier, avec agitation inductive Download PDF

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Publication number
WO1987006332A1
WO1987006332A1 PCT/SE1987/000182 SE8700182W WO8706332A1 WO 1987006332 A1 WO1987006332 A1 WO 1987006332A1 SE 8700182 W SE8700182 W SE 8700182W WO 8706332 A1 WO8706332 A1 WO 8706332A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
steel melt
stirring
stirrer
inductive
Prior art date
Application number
PCT/SE1987/000182
Other languages
English (en)
Inventor
Karl-Erik Berkestad
Original Assignee
Asea Brown Boveri Ab
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 Asea Brown Boveri Ab filed Critical Asea Brown Boveri Ab
Priority to BR8707667A priority Critical patent/BR8707667A/pt
Publication of WO1987006332A1 publication Critical patent/WO1987006332A1/fr

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
    • F27D27/00—Stirring devices for molten material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/451—Magnetic mixers; Mixers with magnetically driven stirrers wherein the mixture is directly exposed to an electromagnetic field without use of a stirrer, e.g. for material comprising ferromagnetic particles or for molten metal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/34—Arrangements for circulation of melts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/45—Mixing in metallurgical processes of ferrous or non-ferrous materials
    • 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
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0039—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising magnetic means
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/02—Stirring of melted material in melting furnaces
    • 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
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to an arrangement for steel making in a container for molten steel with inductive stirring * "C of the molten steel.
  • the invention aims to provide a solution to the above-mentione problems and other problems associated therewith and is charac terized in that the inductive stirring is adapted to be brough * ⁇ about by at least two substantially horizontally acting induc ⁇ tive stirrers, located at different levels of the steel melt,
  • the stirring direction of one stirrer thus being substantially opposite to that of the other stirrer.
  • a stirring is achieved in which the different parts of the steel melt, while being simultaneously mixed, are forced up to the surface in order to be exposed at the surface to as large an area as possible.
  • the inductive stirring producing at least one magne- tic field which acts in the lower part of the steel melt and which there, substantially in the horizontal plane, drives the steel melt to rotate in a certain direction
  • the induc ⁇ tive stirring producing at least one further magnetic field which acts in the upper part of the steel melt and which there, substantially in the opposite direction, drives the steel melt.
  • the stirring is given greater force and/or speed in the lower parts of the stee melt container than in the upper parts.
  • the ideal condition would then be to have the highest speed of rotation at the bottom of the steel melt container and the lowest at the surfac of the steel melt.
  • the steel melt will be pressed from the centre of rotation and outwards towards the walls of the steel melt conta and there, while being at the same time rotated, be pressed further up towards the surface of the steel melt and then, from all directions, float inwards towards the centre of rotation and be sucked down there, and then again, at different levels, be pressed out towards the walls of the steel melt container.
  • a slag layer may also be broken up and be splashed with steel melt by reducing the counteracting effect of the upper inductive stirrer and/or increasing the driving effect of the lower inductive stirrer, which leads to a major depression on the surface of the steel melt and thus enables splashing and breaking-up.
  • the stirrers may be powered with different frequencies, for example a lower frequency for the upper stirrer, which then achieves a longer depth of penetration in that part of the mel
  • the frequency range may be from very low values up o mains frequency (0.1-60 Hz).
  • Figure 1 shows a ladle with two multi-phase, electromagnetic, horizontal stirrers and
  • Figure 2 shows the configuration of flow in the ladle.
  • Figure 1 shows a ladle 1 for molten steel with an upper (2) and a lower (3) stirrer.
  • the stirrers provide a mutually substan- tially opposite travelling field (see 21 and 22).
  • the lower stirrer 3 is also given a greater power so that the magnetic field from this stirrer is more powerful than the fiel from the upper stirrer 2.
  • the upper stirrer 2 may have a lower frequency. However, this will result in a greater depth of penetration for the field from the stirrer supplied with lower frequency.
  • Figure 2 shows two thick arrows 2 and 3, which symbolically show the mutually opposite directions of stirring, i.e. arrow 2 shows the upper magnetic field acting on the steel melt and arrow 3 shows the lower magnetic field acting on the steel mel

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Continuous Casting (AREA)

Abstract

Dispositif pour la fabrication de l'acier avec agitation inductive du bain d'acier dans un récipient contenant celui-ci. Il est souhaitable que les diverses zones de l'acier en fusion soient poussées vers la surface du bain, tout en étant mélangées afin d'être exposées à une surface aussi grande que possible. Ce problème a été résolu par l'agitation inductive, grâce à l'établissement d'au moins un champ magnétique qui agit sur la partie inférieure du bain d'acier et qui oblige l'acier à tourner dans un plan horizontal et dans un sens déterminé, ainsi que par l'agitation inductive obtenue par l'établissement d'au moins un champ magnétique supplémentaire qui agit sur la partie supérieure de l'acier l'entraînant essentiellement dans le sens opposé.
PCT/SE1987/000182 1986-04-16 1987-04-10 Dispositif pour la fabrication d'acier, avec agitation inductive WO1987006332A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR8707667A BR8707667A (pt) 1986-04-16 1987-04-10 Arranjo na fabricacao de aco por meio de agitacao indutiva

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8601763-9 1986-04-16
SE8601763A SE457990B (sv) 1986-04-16 1986-04-16 Anordning foer tillverkning och omroering av smaelt staal

Publications (1)

Publication Number Publication Date
WO1987006332A1 true WO1987006332A1 (fr) 1987-10-22

Family

ID=20364237

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000182 WO1987006332A1 (fr) 1986-04-16 1987-04-10 Dispositif pour la fabrication d'acier, avec agitation inductive

Country Status (5)

Country Link
EP (1) EP0310604A1 (fr)
JP (1) JPH01500526A (fr)
BR (1) BR8707667A (fr)
SE (1) SE457990B (fr)
WO (1) WO1987006332A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2840821A1 (fr) * 2002-06-13 2003-12-19 Commissariat Energie Atomique Dispositif electromagnetique de fusion et d'agitation interfaciale de systemes diphasiques, notamment pour l'acceleration de processus metallurgiques ou pyrochimiques

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1822539A (en) * 1929-03-09 1931-09-08 Ajax Electrothermic Corp Induction electric furnace
US1943802A (en) * 1930-03-18 1934-01-16 Ajax Electrothermic Corp Electric induction furnace
US3314670A (en) * 1963-11-15 1967-04-18 Inductotherm Corp Molten metal stirring apparatus
US3472941A (en) * 1966-02-15 1969-10-14 Leybold Heraeus Gmbh & Co Kg Coreless induction furnace and method of melting and stirring metals in this furnace
US3478156A (en) * 1966-12-21 1969-11-11 Ajax Magnethermic Corp Polyphase stirring of molten metal
DE2350090A1 (de) * 1973-10-05 1975-04-10 Bbc Brown Boveri & Cie Induktions-tiegelofen fuer einphasenund wanderfeldbetrieb
DE2708227A1 (de) * 1976-02-26 1977-09-01 Daido Steel Co Ltd Plasma-ofen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1822539A (en) * 1929-03-09 1931-09-08 Ajax Electrothermic Corp Induction electric furnace
US1943802A (en) * 1930-03-18 1934-01-16 Ajax Electrothermic Corp Electric induction furnace
US3314670A (en) * 1963-11-15 1967-04-18 Inductotherm Corp Molten metal stirring apparatus
US3472941A (en) * 1966-02-15 1969-10-14 Leybold Heraeus Gmbh & Co Kg Coreless induction furnace and method of melting and stirring metals in this furnace
US3478156A (en) * 1966-12-21 1969-11-11 Ajax Magnethermic Corp Polyphase stirring of molten metal
DE2350090A1 (de) * 1973-10-05 1975-04-10 Bbc Brown Boveri & Cie Induktions-tiegelofen fuer einphasenund wanderfeldbetrieb
DE2708227A1 (de) * 1976-02-26 1977-09-01 Daido Steel Co Ltd Plasma-ofen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2840821A1 (fr) * 2002-06-13 2003-12-19 Commissariat Energie Atomique Dispositif electromagnetique de fusion et d'agitation interfaciale de systemes diphasiques, notamment pour l'acceleration de processus metallurgiques ou pyrochimiques
WO2003106009A1 (fr) * 2002-06-13 2003-12-24 Commissariat A L'energie Atomique Dispositif electromagnetique de fusion et d'agitation interfaciale de systemes diphasiques, notamment pour l'acceleration de processus metallurgiques ou pyrochimiques
GB2408699A (en) * 2002-06-13 2005-06-08 Commissariat Energie Atomique Electromagnetic device for interfacial melting and stirring of diphasic systems, in particular for accelerating metallurgical of pyrochemical processes
GB2408699B (en) * 2002-06-13 2006-04-19 Commissariat Energie Atomique Electromagnetic device for fusion and interfacial agitation of diphase systems, particularly for the acceleration of metallurgic or pyrochemical processes
US7799270B2 (en) 2002-06-13 2010-09-21 Commissariat A L'energie Atomique Electromagnetic device for fusion and interfacial agitation of diphase systems, particularly for the acceleration of metallurgic or pyrochemical processes

Also Published As

Publication number Publication date
SE457990B (sv) 1989-02-13
JPH01500526A (ja) 1989-02-23
BR8707667A (pt) 1989-08-15
SE8601763L (sv) 1987-10-17
SE8601763D0 (sv) 1986-04-16
EP0310604A1 (fr) 1989-04-12

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