SE1300434A1 - En anordning för elektromagnetisk omrörning av smältan i en elektrisk ljusbågsugn - Google Patents
En anordning för elektromagnetisk omrörning av smältan i en elektrisk ljusbågsugn Download PDFInfo
- Publication number
- SE1300434A1 SE1300434A1 SE1300434A SE1300434A SE1300434A1 SE 1300434 A1 SE1300434 A1 SE 1300434A1 SE 1300434 A SE1300434 A SE 1300434A SE 1300434 A SE1300434 A SE 1300434A SE 1300434 A1 SE1300434 A1 SE 1300434A1
- Authority
- SE
- Sweden
- Prior art keywords
- electromagnetic stirring
- arc furnace
- stirring unit
- electrical arc
- electromagnetic
- Prior art date
Links
- 238000003756 stirring Methods 0.000 title claims abstract description 50
- 238000010891 electric arc Methods 0.000 title abstract description 5
- 239000000155 melt Substances 0.000 title 1
- 239000000161 steel melt Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000013019 agitation Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric 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
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Föreliggande uppfinning avser en anordning (1) för elektromagnetisk om-rörning av stålsmältan i en elektrisk ljusbågsugn (10), innefattande åtminstone en elektromagnetisk omrörarenhet (12) monterad på en yttre bot-tenyta av den elektriska ljusbågsugnen, åtminstone en strömförsörjning (14) operativt ansluten till den elektromagnetiska omrörningsenheten (12) för att tillföra ström till den elektromagnetiska omrörningsenheten (12) och en styrenhet (16) som är operativt ansluten till strömkällan (14) för att styra driften av den elektromagnetiska omrörningsenhet (12), varvid den elektromagnetiska omrörningsenheten (12) har en böjd form och strömmen som tillförs den elektromagnetiska omrörningsenheten (12) är upp till 1800 ampere.(Fig. 1b)
Description
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steel pool surface and bottom, operators have to increase the melting, re-
fining time and liquid melt temperature and, unnecessarily to delay the
EAT for tapping. This results in high energy consumption of the EAF and
reduced productivity.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the present invention is to provide an electromagnetic stir-
ring device for an electric arc furnace including a vessel, wherein a larger
amount of molten is electromagnetically stirred. Thus a high production of
steelmaking is achieved.
ln a first aspect of the invention, there is an apparatus provided for elec-
tromagnetic stirring of the steel melt in an electrical arc furnace and com-
prising at least one electromagnetic stirring unit mounted on an outer bot-
tom surface of the electrical arc furnace, at least one power supply opera-
tively connected to the electromagnetic stirring unit; and a control unit op-
eratively connected to the power supply to control the operation of the
electromagnetic stirring unit. The electromagnetic stirring unit has a bend-
ed form and the current supplied to the electromagnetic stirring unit may
be up to 1800 Ampere.
Due to the electromagnetic stirring and being supplied with a larger power,
it is possible to move liquid steel in the furnace with velocity of 0.5 to 1
m/s. Thus, heat transfer coefficient is increased and the temperature gra-
dient is subsequently minimized.
Another advantage to apply this new structure of EMS is that the new elec-
tromagnetic stirrer significantly changes state of metal melt from little nat-
ural flow to convectional flow, which further improves scrap melting and
enhance steel melt bath homogenization as to both temperature and com-
position, which furthermore enhances the performance of oxygen lance by
increase active reaction area and efficiency of chemical reactions. There-
fore, energy consumption is reduced.
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ln a second aspect of the invention, there is an electrical arc furnace for
melting steel, wherein the electrical arc furnace comprises a vessel and an
apparatus for electromagnetic stirring of the steel melt in an electrical arc
furnace according to claim 1. The vessel is constructed with proportion of
width and height being 1:4 - 1:5.
According to one embodiment of the invention, the electrical arc furnace is
type of eccentric bottom tapping (EBT) electrical arc furnace. Usually,
such an EBT electric arc furnace has a diameter in the range of 6-8 meter.
Thus, with a proportion of width and height being 1:5, the EBT may have a
height up to 1.6 meter.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be explained more closely by the description of dif-
ferent embodiments of the invention and with reference to the appended
figures.
Fig. 1a shows a top view of an EAF, wherein liquid molten of steel is elec-
tromagnetically stirred by an apparatus according to one embodiment of
the invention.
Fig. 1b presents a side view of an EAF compared to a traditional design
shown in left.
Fig. 2 shows an embodiment of an electromagnetic stirring unit with a
bended form according to one embodiment of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF
THE INVENTION
Figs. 1a illustrates an electrical arc furnace (EAF) 10, in which an appa-
ratus 1 for electromagnetic stirring of the steel melt in the EAF 10 accord-
ing to one embodiment of the invention is implemented. The EAF may be a
DC EAF or an AC EAF.
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ln this example, the apparatus 1 for electromagnetic stirring comprises
one electromagnetic stirring unit 12, a single power supply system 14 op-
eratively connected to the electromagnetic stirring unit 12 and a control
unit 16 operatively connected to the single power supply system 14 to con-
trol the operation of the electromagnetic stirring unit 12. The electromag-
netic stirring unit 12 is mounted on an outer bottom surface 10a of the
EAF. The EAF has typically a bottom electrode located at the central posi-
tion 10b of the bottom surface 10a and the electromagnetic stirring unit is
mounted on bottom electrode.
The figure also shows that the type of the EAF is EBT type of EAF fur-
nace, denoted as EBT-EAF.
With reference to Figure 1b, the EAF further comprises arc generating sys-
tem 19 including three electrodes and a power supply system (not shown
in the figure) that is operatively connected to the electrodes.
Both a traditional EBT EAF and the new EBT EAF may have a diame-
ter/width in the range of 6-8 meter. However, by applying EMS to the EAF,
the new EBT-EAF can be designed 1.3 times higher/deeper than the tradi-
tional one. Therefore, the new EBT_EAF increases steel bath volume with
20-30%, which consequently increases productivity and shortens tap-to-
tap time.
lt shall be appreciated that the EAF may typically be made of iron and in
such instance the material at the areas of the EAF where the electromag-
netic stirring unit will be located has to be changed to non-magnetic mate-
rial such as e.g. stainless steel.
The single power supply system 14 may be exchanged for a plurality of
current supplies, e.g. one for each electromagnetic stirring unit. To be
able to stir a huge amount of melt, a current in the range of up to1800
Amperes is supplied to the electromagnetic stirring units.
The control unit 16 and the single power supply system 14 are preferably
configured to operate the electromagnetic stirring unit 12 as a single unit.
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However, it should be understood that the apparatus may comprise two
electromagnetic stirring units that are mounted at opposite sides of a cen-
tral position 10b of the bottom surface 10a. ln this case, a single power
supply system 14 can be operatively connected to the two stirring units
such that the two stirrings are operated in parallel in either forward or
backward direction or are operated in opposite directions to each other
giving a steel melt flow circulating along the furnace walls either clockwise
or anti-clockwise.
Further, the control unit 16 and the single power supply system 14 may be
configured to operate the electromagnetic stirring unit 12 to obtain differ-
ent stirring operations and/or different stirring patterns during different
phases of the EAF process cycle.
The electromagnetic stirring unit has at least one core with one or several
bends adapted to the shape of the outer bottom surface of the electrical
arc furnace. Hereby, appropriate stirring may be obtained while minimizing
the energy used therefore. Further, very strong stirring forces can be ob-
tained.
Figure 2 illustrates an embodiment of an electromagnetic stirring unit that
can be used in the apparatus 1 for electromagnetic stirring of Figs. 1a-b.
The electromagnetic stirring unit comprises a core 21 and a winding 22.
The core 21 has one or several bends 23 adapted to the shape of the out-
er bottom surface 10a of the EBT EAF 10. Hereby the electromagnetic stir-
ring unit can be place closer to the EAF 10 and can thus provide stronger
stirring forces and/or be made more energy efficient.
Claims (4)
1. An apparatus (1) for electromagnetic stirring of the steel melt in an electrical arc furnace (10), comprising: - at least one electromagnetic stirring unit (12) mounted on an outer bot- tom surface of the electrical arc furnace, - at least one power supply system (14) operatively connected to the electromagnetic stirring unit (12) for supplying power to the electromag- netic stirring unit (12); and - a control unit (16) operatively connected to the power supply (14) to control the operation of the electromagnetic stirring unit (12), characterized in that - the electromagnetic stirring unit (12) has a bended form and, - the current supplied to the electromagnetic stirring unit (12) is in a range up to 1800 Ampere.
2. An electrical arc furnace for melting steel, wherein the electrical arc furnace comprises a vessel and an apparatus according to claim 1 for electromagnetic stirring of the steel melt in an electrical arc furnace, characterized in that the proportion of width and height of the vessel is constructed in the range of 1:4 - 1:5.
3. Electrical arc furnace according to claim 2, wherein the electrical arc furnace is type of eccentric bottom tapping (EBT) electrical arc furnace.
4. Electrical arc furnace according to claims 2 or 3, wherein the vessel has a width or diameter in the range of 6-8 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1300434A SE1300434A1 (sv) | 2013-06-17 | 2013-06-17 | En anordning för elektromagnetisk omrörning av smältan i en elektrisk ljusbågsugn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1300434A SE1300434A1 (sv) | 2013-06-17 | 2013-06-17 | En anordning för elektromagnetisk omrörning av smältan i en elektrisk ljusbågsugn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE1300434A1 true SE1300434A1 (sv) | 2013-06-20 |
Family
ID=48749646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1300434A SE1300434A1 (sv) | 2013-06-17 | 2013-06-17 | En anordning för elektromagnetisk omrörning av smältan i en elektrisk ljusbågsugn |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE1300434A1 (sv) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018145754A1 (en) | 2017-02-10 | 2018-08-16 | Abb Schweiz Ag | Furnace assembly for a metal-making process |
-
2013
- 2013-06-17 SE SE1300434A patent/SE1300434A1/sv not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018145754A1 (en) | 2017-02-10 | 2018-08-16 | Abb Schweiz Ag | Furnace assembly for a metal-making process |
| EP3580512B1 (en) | 2017-02-10 | 2021-03-31 | ABB Schweiz AG | Furnace assembly for a metal-making process |
| EP3848656A1 (en) | 2017-02-10 | 2021-07-14 | ABB Schweiz AG | Furnace assembly for a metal-making process |
| US11543182B2 (en) | 2017-02-10 | 2023-01-03 | Abb Schweiz Ag | Furnace assembly for a metal-making process |
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|---|---|---|---|
| NAV | Patent application has lapsed |