WO1987006332A1 - Arrangement in steel manufacturing by means of inductive stirring - Google Patents

Arrangement in steel manufacturing by means of inductive stirring Download PDF

Info

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
French (fr)
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/en
Publication of WO1987006332A1 publication Critical patent/WO1987006332A1/en

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

Abstract

An arrangement for steel making with inductive stirring of the steel melt in a steel melt container. It is desirable for the various parts of the steel melt to be forced up to the surface, while at the same time being mixed, in order to be exposed there to as large an area as possible. This task has been solved by the inductive stirring producing at least one magnetic 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, and by the inductive 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.

Description

Arrangement in steel manufacturing by means of inductive stirring
. The present invention relates to an arrangement for steel making in a container for molten steel with inductive stirring *"C of the molten steel.
In the manufacture of quality steel, different steel qualities 5 require different metallurgical measures while simultaneously stirring and mixing the molten steel. It has long been known that a so-called inductive stirrer, located on the outside of the steel melt container, may cause the steel melt to rotate while being influenced by the magnetic field created by the in
10 tive stirrer. Known applications comprises one or more induct stirrers, which however primarily cause the steel melt in its entirely to rotate rather than to be mixed. Since the metal¬ lurgical penetrations in most cases occur at the surface of th steel melt, it would be desirable - in addition to achieving
15 improved mixing - for the various parts of the steel melt to be forced up to the surface, while at the same time being mixe in order to be exposed there to as large an area as possible. Such a movement pattern of the steel melt would provide more uniform steel qualities in a shorter process time, which in tu
20 would result in a direct reduction of the cost of production. As examples of measures which are taken on the surface of the steel melt may be mentioned heating, dehydrogenation under vacuum, desulphurizing by means of lime, carbon combustion by means of oxygen, and supplying alloying materials.
25 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,
30 the stirring direction of one stirrer thus being substantially opposite to that of the other stirrer. By means of the invention, 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. This has been solved by 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, and by 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.
In a preferred embodiment of the invention, 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.
At different levels of the steel melt - and while at the same time the layers of the steel melt are twisted in relation to each other - 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. Where necessary, 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).
The invention will be exemplified in greater detail with ref¬ erence to the accompanying drawing, wherein
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). Possibly, 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. It is also possible to stir with a greater speed in the lower parts than in the upper parts. In order to achieve this, 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.
Of course it is also possible to supply the stirrers with the same frequency, however with greater power in the other one.
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
The arrows 4 in the middle of Figure 2 illustrate the speeds of rotation diminishing in an upward direction, and the small arrows 5 show the superimposed movements of the melt.
It is thus clear that the different parts of the melt are force up to the surface while at the same time being mixed. The arrangement according to the invention can be varied in ma ways within the -scope of the appended claims.

Claims

1. Arrangement for steel making in a container for molten steel with inductive stirring of the molten steel, c h a r a c t e r i z e d in that the inductive stirring is adapted to be accomplished by at least two substantially hori¬ zontally acting inductive stirrers located at different levels of the steel melt, the stirring direction for one of the stirr¬ ers being substantially opposite to that for the other stirrer.
2. Arrangement according to claim 1, c h a r a c t e r i z e in that the stirring force and/or the rate of stirring for the lower stirrer is/are greater than for the upper stirrer.
3. Arrangement according to claim 1 and possibly claim 2, c h a r a c t e r i z e d in that the power of the magnetic fields from the respective stirrers may be varied and/or that the stirring direction may be reversed.
4. Arrangement according to one or more of the preceding claims, c h a r a c t e r i z e d in that the frequency for one of the stirrers is lower than for the other stirrer.
PCT/SE1987/000182 1986-04-16 1987-04-10 Arrangement in steel manufacturing by means of inductive stirring WO1987006332A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR8707667A BR8707667A (en) 1986-04-16 1987-04-10 ARRANGEMENT IN STEEL MANUFACTURING THROUGH INDUCTIVE AGITATION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8601763-9 1986-04-16
SE8601763A SE457990B (en) 1986-04-16 1986-04-16 DEVICE FOR MANUFACTURING AND MOVING OF MOLD STEEL

Publications (1)

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

Family

ID=20364237

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000182 WO1987006332A1 (en) 1986-04-16 1987-04-10 Arrangement in steel manufacturing by means of inductive stirring

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2840821A1 (en) * 2002-06-13 2003-12-19 Commissariat Energie Atomique Electromagnetic device for the interfacial fusion and stirring of a di phasic system using a field winding fed with a double component current with high and low frequency components for fusion and stirring operations

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 (en) * 1973-10-05 1975-04-10 Bbc Brown Boveri & Cie Crucible electrical induction furnace - has a wound through coil with tappings, whose sections can be connected to a three-phase or single-phase supply
DE2708227A1 (en) * 1976-02-26 1977-09-01 Daido Steel Co Ltd Plasma melting furnace fitted with induction coils - using three phase travelling magnetic field for stirring molten metal

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 (en) * 1973-10-05 1975-04-10 Bbc Brown Boveri & Cie Crucible electrical induction furnace - has a wound through coil with tappings, whose sections can be connected to a three-phase or single-phase supply
DE2708227A1 (en) * 1976-02-26 1977-09-01 Daido Steel Co Ltd Plasma melting furnace fitted with induction coils - using three phase travelling magnetic field for stirring molten metal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2840821A1 (en) * 2002-06-13 2003-12-19 Commissariat Energie Atomique Electromagnetic device for the interfacial fusion and stirring of a di phasic system using a field winding fed with a double component current with high and low frequency components for fusion and stirring operations
WO2003106009A1 (en) * 2002-06-13 2003-12-24 Commissariat A L'energie Atomique Electromagnetic device for interfacial melting and stirring of diphasic systems, in particular for accelerating metallurgical of pyrochemical processes
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
JPH01500526A (en) 1989-02-23
SE8601763D0 (en) 1986-04-16
SE457990B (en) 1989-02-13
BR8707667A (en) 1989-08-15
SE8601763L (en) 1987-10-17
EP0310604A1 (en) 1989-04-12

Similar Documents

Publication Publication Date Title
US4018598A (en) Method for liquid mixing
JP4245673B2 (en) Aluminum melting furnace with stirring device, molten aluminum stirring device, and molten aluminum stirring method
CA1328902C (en) Apparatus and method for melting and homogenizing batch material
US2686823A (en) Rotary electric field fluid stirring apparatus
EP0228024B1 (en) Method of rendering slag-bath reactions more efficient and arrangement for carrying out the method
CN1066653C (en) Electromagnetic stirring apparatus for use in slab continuous casting crystallizer
WO1987006332A1 (en) Arrangement in steel manufacturing by means of inductive stirring
US3567204A (en) Apparatus for refining molten metal
US3961775A (en) Method and apparatus for liquid mixing
US4080195A (en) Melt reduction of iron ore
US3621103A (en) Methods of and apparatus for stirring immiscible conductive fluids
US4060409A (en) Mechanically stirred furnace for pyrometallurgical operations and processes
KR20170025487A (en) METHODS AND DEVICE FOR ELECTROMAGNETIC STIRRING OF THE Sn-Al ALLOY
JPS6213410B2 (en)
US5738823A (en) Meltdown apparatus
JP2003207283A (en) Method and device for mixing molten metal
EP0286934B1 (en) Method of reducing lining wear in a ladle containing a melt
US3912237A (en) Method and apparatus for moving of liquid phases in industrial processes
EP4192638A1 (en) Agitation device and method for melting furnace and melting furnace
US4071687A (en) Electric arc furnace for continuous melting of directly reduced iron or directly reduced iron ore
US3653879A (en) Rotary reactor and method for treating melts
US3592629A (en) Method for refining molten metal
CA2153995A1 (en) A.c. magnetic stirring modifier for continuous casting of metals
RU2104607C1 (en) Method for electromagnetic control of rotary motion of electricity conducting body
JPH11124619A (en) Device for electromagnetically stirring molten steel in ladle

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): DE FR GB IT

WWE Wipo information: entry into national phase

Ref document number: 1987902820

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1987902820

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1987902820

Country of ref document: EP