WO2004035837A1 - Revamping of a basic oxygen furnace into an electric furnace for making steel - Google Patents
Revamping of a basic oxygen furnace into an electric furnace for making steel Download PDFInfo
- Publication number
- WO2004035837A1 WO2004035837A1 PCT/IB2002/004241 IB0204241W WO2004035837A1 WO 2004035837 A1 WO2004035837 A1 WO 2004035837A1 IB 0204241 W IB0204241 W IB 0204241W WO 2004035837 A1 WO2004035837 A1 WO 2004035837A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- electric
- fume
- basic oxygen
- fumace
- Prior art date
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 59
- 239000001301 oxygen Substances 0.000 title claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 239000003517 fume Substances 0.000 claims abstract description 48
- 238000012546 transfer Methods 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- 238000009628 steelmaking Methods 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 14
- 238000010891 electric arc Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 7
- 239000008188 pellet Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 229910000514 dolomite Inorganic materials 0.000 claims description 4
- 239000010459 dolomite Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 238000007670 refining Methods 0.000 abstract 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 11
- 239000002826 coolant Substances 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
-
- 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
- C21C5/5294—General arrangement or layout of the electric melt shop
-
- 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
- F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type 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
- F27B3/06—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement
-
- 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
-
- 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
-
- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/003—Extraction of waste gases, collection of fumes and hoods used therefor of waste gases emanating from an electric arc furnace
-
- 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
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0035—Devices for monitoring the weight of quantities added to the charge
-
- 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 converting from the use of a basic oxygen furnace in an existing steel making facility to the use of an electric furnace and more particularly to effecting such a conversion by minimizing disruption to existing operation ofthe facility and using existing material and flow paths.
- a steel making installation having a basic oxygen furnace facility essentially including basic oxygen furnace vessel, pedestal bearings, furnace support pedestals, furnace tilting drive, oxygen lance, fume duct cleaning, flux additive system, ladle alloy addition system, and scrap handling systems, a method for revamping the steel making installation to convert the basic oxygen furnace facility to an electric furnace facility, the method including the steps of discarding each ofthe basic oxygen furnace vessel, pedestal bearings, furnace tilting drive and oxygen lance, modifying the furnace support pedestals to form spaced apart horizontal rail support pads extending generally horizontally between a furnace operating position and a furnace exchange position, installing car rails on the spaced apart horizontal rail support pads, installing an electric furnace on a transfer car for movement along the car rails between the operating position and the furnace exchange position, the electric furnace having a tapping orifice for discharging treated steel and a fume opening for discharging an exhaust fume while residing at the furnace operating position, and modifying each ofthe fume duct, flux additive system, ladle alloy addition system
- an apparatus for revamping a steel making furnace installation to convert a basic oxygen furnace facility to an electric furnace facility the basic oxygen furnace facility essentially including bearing pedestals to pivotally support a basic oxygen furnace vessel, a fume duct and transfer cars for ladles containing tapped steel and slag, the apparatus including the combination of spaced apart horizontal rails supported by the bearing pedestals, an electric furnace supported on a transfer car for movement along the rails between an operating position formerly occupied by basic oxygen furnace when supported by the bearing pedestals and a furnace exchange position, the electric arc furnace having a tapping orifice for discharging a burden treated in the furnace and a fume discharge opening, the furnace being position by the rails for tapping steel and slag to ladles on the transfer cars, and fume duct sections for delivering a fume received from the fume discharge opening to the fume duct.
- Figure 1 is a side elevational view of a basic oxygen furnace facility
- Figure 2 is a front elevation view taken along lines II-II of Figure 1 ;
- Figure 3 is a side elevational view illustrating an electric furnace installation using existing and modifications to the facilities shown in Figures 1 and 2;
- Figure 4 is a plan view ofthe electric furnace shown in Figure 3;
- Figure 5 is a front elevational view taken along lines V-N of Figure 3;
- Figure 6 is a schematic illustration ofthe material storage and handling systems for the electric furnace of Figures 3-5;
- Figure 7 is a schematic illustration of a volume metric feeder for delivering material from a hopper to a new conveyor system according to the present invention;
- Figure 8 is a schematic illustration of a conveyance system for supplying alloys to a ladle containing tapped steel at an alloying station.
- Figure 9 is ah enlarged fragmentary illustration of a modification to the electric arc furnace shown in Figure 3-5.
- FIGS 1 and 2 there is illustrated an example of a basic oxygen furnace facility suitable for modification according to the present invention to provide for the installation and operation of an electric furnace.
- a basic oxygen furnace 10 has trunnions extending from diametrically opposite sides ofthe furnace and mounted in bearing assemblies 12 and 14 that are in turn supported by upstanding bearing pedestals 16 and 18 carried by massive reinforced foundation pedestals 20 and 22.
- Rails 24 and 26 extend in the space between the foundation pedestals for the movement of a plurality of transfer cars 28 used to transport ladles containing tapped steel and slag incident to the operation ofthe basic oxygen furnace.
- a trunnion pin for the furnace projects beyond the bearing assembly 12 for connection by a coupling to a furnace tilting drive 30 that is operated to tilt the furnace in a direction to drain slag over the furnace mouth opening lip into a slag pot on one ofthe transfer cars 28.
- the furnace is tilted in the opposite direction by drive 30 to supply liquid steel through an opening in the furnace wall to a teeming ladle on another ofthe transfer cars 28.
- a large opening in the top ofthe furnace discharges fume into an overlying fume collection and cooling hood 32 which supplies the fume to an evaporation chamber and filter equipment, not shown, to recover pollutants.
- the hood extends upwardly in an acute angle to the vertical and is provided with an opening in the upwardly directed wall ofthe hood to introduce an oxygen lance 34 through the opening in the overlying fume cooling hood 32 and into the basic oxygen furnace 10 for introducing oxygen to the surface or into the metal in the furnace. It is, however, within the scope ofthe present invention to modify a basic oxygen furnace installation where the furnace is provided with a tuyerse in the bottom for the introduction of oxygen commonly known as Q-BOP. Another opening in the lower end of the overlying fume cooling hood receives a duct 36 connected to a hopper 38 which is supplied with fluxing and additive materials by conveyors 40 extending to a plurality of side- by-side storage bins 42.
- Building columns are used to form supports for floors at various elevations throughout the facility and provide access to the ancillary equipment such as the storage bins 42.
- a floor 44 supported by pillars 46 above ground level to carry rails 48 for a scrap charging car 50.
- the car 50 supports a scrap box 52 that can pivot about a shaft 54 by operation of a piston and cylinder assembly 56.
- Shown in Figure 2 is a ladle alloying station 58 located at a laterally spaced site at the furnace and used to deliver alloying materials from a hopper 60 located above a ladle on a transfer car 28. Sometimes there is no car and the scrap boxes are charged by means of an overhead crane.
- the present invention seeks to maintain the material and process flow paths of the basic oxygen furnace installation by using the output from an electric furnace to provide supplies of liquid steel for use as consumed previously by the basic oxygen furnace.
- the conversion process is devised to minimize disruptions to the existing operations ofthe existing installation and minimize costs to the extent possible by the reuse of existing equipment and buildings.
- the design ofthe electric furnace used in the conversion according to the present invention permits operation ofthe furnace without requiring an overhead crane to charge the furnace and lift furnace components from their operating location. It is necessary however to abandon the basic oxygen furnace vessel 10, the bearing assemblies 12 and 14 and furnace tilt drive 30 as well as the bearing pedestals 16 and 18. Part ofthe fume cooling hood 32 and some but not all ofthe flux additive systems formed by the plurality of side-by-side bins 42 and the fluxing and additive conveyor system will be abandon.
- ladle transfer cars 28 remain unchanged for movement along the same rails 24 and 26.
- the foundation pedestals 20 and 22 are modified by the removal ofthe bearing pedestals 16 and 18 and foundation pedestal 20 altered by forming a shelf 62 at the same elevation as the upper face surface 64 of foundation pedestal 22. Shelf 62 and surface 64 serves as support pads for rails 66 used to support a furnace transfer car 68.
- the rails extend beyond the existing foundation pedestals 20 and 22 to an adjacent bay in the steel making facility where the rails are supported by a superstructure 70 and form a furnace exchange site 72.
- the furnace transfer car is provided with wheels for movement by a winch 74 from a furnace operating position 76 where the transfer car is secured against movement against a stop by a ratchet, not shown.
- the winch 74 includes a cable 75 secured to opposite ends ofthe furnace transfer car.
- the furnace transfer car includes a furnace support frame 80 on which there is mounted an electric arc furnace 82 formed by a lower furnace shell 84, an upper furnace shell 86 and a furnace roof 88.
- the furnace roof 88 includes roof panels formed by an array of side-by-side coolant pipes with the coolant passageways communicating with annular upper and lower water supply headers 92 and 94, respectively, interconnected by radial distributing pipes to form a water circulating system communicating with service lines 96 containing water supply and return lines.
- the service lines 96 include a flexible section to avoid the need to disconnect the service lines when it is desired to lift the furnace roof alone or combined with the upper furnace shell a short distance, e.g., 24 inches, for servicing the lower furnace shell.
- the upper water supply header 92 encircles a triangular array of three apertures in a roof insert 94.
- the apertures are dimensional and arranged to receive the phase A, B and C electrodes 98, 99 and 100 supported by electrode support arms 102, 104 and 106, respectively.
- Each ofthe electrode support arms is independently positioned vertically by support posts 108 restrained by horizontally spaced guides 110 in a newly formed superstructure 112 for vertical displacement by actuator 114 typical in the form of piston and cylinder assembly.
- the electrode support arms 102, 104 and 106 support water cooled cables for transmission of electrical current from transformers in a transformer vault 115 to the respective phase A, B and C electrodes.
- a fume duct 116 extends vertically from an annular opening in the furnace roof between the upper and lower water supply headers 92 and 94 for exhausting fumes from the interior ofthe furnace to an enlarged and vertically spaced duct section 118.
- the vertical duct section 118 forms a replacement to a discarded section ofthe overlying fume hood 32.
- the vertical duct section 118 is joined to the remnant ofthe overlying fume hood 32 by the elbow 120.
- the duct 118 and elbow 120 are formed by side-by-side coolant pipes to provide thermal protection, the same construction as the overlying fume hood 32.
- the furnace upper shell includes superimposed convolutions of coolant pipe supplied with coolant from spaced apart supply headers that are interconnected by vertical distribution pipes to form a water circulating system communicating with service lines 128 containing water supply and return lines.
- Metal panels may be supported by the coolant pipes ofthe furnace roof and the coolant pipe ofthe furnace upper shell for confinement ofthe fume to the interiors of these furnace components.
- the service lines 128 include a flexible section to avoid the need to disconnect the service lines when it is desired to lift the furnace roof combined with the upper furnace shell a short distance, e.g., 24 inches, for servicing the lower furnace shell.
- the convolutions of coolant pipe forming the upper furnace shell 86 are interrupted by a scrap charge opening 132 in one quadrant and a slag discharge opening 134 in an adjacent quadrant ofthe annular configuration shell.
- the scrap charge opening 134 is used to introduce quantities of scrap at closely spaced apart intervals throughout the major portion ofthe furnace operating cycle and the scrap residing in a retractable chute of a scrap charger 136 serves as a media to prevent unwanted escape ofthe fume from the furnace in the scrap charger.
- a bunker 138 embodies a fabricated construction to supply scrap to the scrap charger 136.
- the scrap charger car 50 is relocated to move along installed rails 139.
- a slag door 140 is lifted to allow the flow of slag beyond a threshold formed by a carbon rod insert 142 which is supported by suitable brackets on the lower furnace shell 84 to a slag pot on a transfer car 28.
- the furnace charging material for the most common steel making operation will be scrap which is preferable continuously introduced at closely spaced time increments.
- direct reduction pellets DRI
- the chute 164 is arranged at an angular relation to the vertical so that the DRI impacts with the metal bath at a site proximate to the triangular array of electrodes to take advantage ofthe highly heated area in the metal bath for rapidly melting the pellets of DRI material.
- Openings 168 communicate with chutes 170 for introducing fluxing and carbon materials to the melt in the furnace.
- Liquid metal may also form a furnace charge or a part thereof.
- the liquid metal will comprise blast furnace iron when available and can be introduced to the furnace by use of a pouring tundish with wheels arranged for supporting the tundish on the rails 74 and 76.
- the tundish will include a launder arranged to allow the introduction of liquid metal through openings formed by the slag discharge trough.
- a ladle will be carried by crane to tundish for introducing liquid metal to the tundish.
- the refractory lining in the lower furnace shell is preferably constructed to allow a larger tonnage output at a shorter furnace operating cycle by maintaining a liquid metal heel provided by the configuration ofthe liquid metal cavity in the refractory after tapping is at least 70% preferably 100% ofthe heat before tapping.
- a liquid metal heel provides a substantial thermal benefit after tapping to maintain flat bath operation throughout the charging of scrap and/or other forms for charging material. Melting a newly introduced scrap charge combined with the introduction of heat by operation of electrodes can continue throughout the charging ofthe furnace.
- FIG. 3 illustrates the use of a control 172 typically located in an operator pulpit and having a summation circuit receiving input signals from the load cells 174 on the furnace support frame 80 in load bearing contact with struts 176 affixed to the outer surface ofthe lower furnace shell 84.
- the weight ofthe liquid metal heat may be displayed in any convenient way such as a numerical read out 178. The read out will be used to control the furnace operation including start and stop of charging and tapping.
- FIG 6 schematically illustrates the continued use of bins 42 for direct reduction iron pellets which pass through gravimetric feeders 180, as shown in Figure 7, that are added to each ofthe bins for delivery ofthe pellets to suitably arranged conveyors 182 and 183 for introduction into the furnace using chute 164.
- Another suitably arranged conveyors 184 and 185 supplies dolomite, lime, and carbon from respective supplies in individual ones ofthe bin's 42 to the furnace using chutes 170.
- the opening 166 in the furnace roof receives carbon/oxygen lances 186 connected by and using volume metric or gravimetric control supply lines to a batching hopper 188 communicating with a foaming slag carbon silo 190.
- the alloy station is relocated and expanded by the addition of a synthetic slag feed system that includes the addition of a jib crane 192 for introducing synthetic slag to a hopper 194 which in turn discharges desired quantities of synthetic slag through a chute to a ladle on a transfer car 28.
- a synthetic slag feed system that includes the addition of a jib crane 192 for introducing synthetic slag to a hopper 194 which in turn discharges desired quantities of synthetic slag through a chute to a ladle on a transfer car 28.
- Another chute conducts a desired quantity of alloy material from a hopper 60 receiving supplies of alloy material from the relocated alloying supply vessel 198.
- Figures 3-5 illustrate the preferred form of an electric furnace to carry out the conversion of a basic oxygen furnace installation.
- Figure 9 illustrates a modification to the electric arc furnace which essentially provides for the pivotal support ofthe lower furnace shell on the furnace car.
- the furnace support frame 80 is provided with spaced apart rollers 200 rotatably supported by bearing assemblies.
- the bottom ofthe lower furnace shell is provided with spaced apart arcuate bars 202 in load bearing contact with the rollers 200.
- the entire furnace is supported on the furnace car by the rollers and can be tilted in opposite directions by operation of a piston cylinder assembly 204 mounted on the furnace car and its rod end clevis mounted to the lower furnace shell.
- the construction ofthe furnace in all other respects will be the same as shown in Figures 3-5 and described hereinbefore.
- arc heating furnaces used to heat a metal charge by heat radiation from arcs passed between electrodes above the metal charge.
- Other furnace designs include an electrically conductive furnace bottom which forms part of an electrical circuit powered by direct current.
- Induction furnaces can also be installed which operate to heat a metal charge by either using inductors according to a transformer principle where the secondary winding is formed by a loop of liquid metal in a refractory channel or a coreless principle where induction coils surround the furnace wall and generates a magnetic field to impart energy to the metal charge in the furnace.
Abstract
An existing steel making installation having a basic oxygen furnace facility is converted to an electric arc furnace facility for refining steel by modifying the furnace support pedestals to form spaced apart horizontal rail support pads and spaced apart rails are mounted on the pads and a superstructure extending horizontally at one side of the space formally occupied by the basic oxygen furnace. An electric arc furnace is mounted on a furnace transfer car for movement along newly installed horizontal rails between a furnace operating position and a furnace exchange position. The electric furnace having a tapping orifice for discharging treated steel and a slag discharge trough. Ladle transfer cars previously used for handling slag and steel from the basic oxygen furnace are reused for the same purpose during operation of the electric arc furnace. A fume opening in the electric furnace roof is connected by a vertical fume section and an elbow to the existing fume system. Bins used for supplying materials to the basic oxygen furnace are used to supply in some instances different materials to the electric arc furnace.
Description
REVAMPING OF BASIC OXYGEN FURNACE INTO AN ELECTRIC FURNACE FOR MAKING STEEL
Background ofthe invention
1. Field ofthe invention: The present invention relates to converting from the use of a basic oxygen furnace in an existing steel making facility to the use of an electric furnace and more particularly to effecting such a conversion by minimizing disruption to existing operation ofthe facility and using existing material and flow paths.
2. Description ofthe prior art: Steel making facilities used blast furnaces extensively in the past to provide a supply of liquid iron for conversion to steel. Open hearth furnaces used for the conversion process were replaced by oxygen steel making process used extensively for the conversion process. Oxygen is introduced through, onto or over a bath containing blast furnace iron, steel scrap and fluxes. The facility required for the oxygen steel making process include not only a large open top refractory liquid vessel but also slag and steel transfer ladles as well as storage bunker and conveying equipment for the fluxes and scrap. Blast furnaces represent an extensive capital investment and maintenance costs. Direct reduction is sometimes a less expensive alternative supply of iron and an abundant supply of scrap are large reducing the demand for iron. As blast furnaces are taken out of service and not replaced, the investment in the facility for the oxygen steel making process is a loss because ofthe loss ofthe source of liquid iron.
It is an object ofthe present invention to provide an economical way to convert basic oxygen furnace equipment by making extensive continued reuse of ancillary equipment with a newly installed electric furnace.
It is another object ofthe present invention to provide for the modification of the foundation for a basic oxygen furnace vessel to support an electric furnace and allow continued use of ladle transfer cars for slag and tapped steel.
It is a further object ofthe present invention to provide a method for relatively rapid replacement of a basic oxygen furnace with an electric furnace to minimize loss of production.
Brief summary ofthe invention
According to the present invention there is provided in a steel making installation having a basic oxygen furnace facility essentially including basic oxygen furnace vessel, pedestal bearings, furnace support pedestals, furnace tilting drive, oxygen lance, fume duct cleaning, flux additive system, ladle alloy addition system, and scrap handling systems, a method for revamping the steel making installation to convert the basic oxygen furnace facility to an electric furnace facility, the method including the steps of discarding each ofthe basic oxygen furnace vessel, pedestal bearings, furnace tilting drive and oxygen lance, modifying the furnace support pedestals to form spaced apart horizontal rail support pads extending generally horizontally between a furnace operating position and a furnace exchange position, installing car rails on the spaced apart horizontal rail support pads, installing an electric furnace on a transfer car for movement along the car rails between the operating position and the furnace exchange position, the electric furnace having a tapping orifice for discharging treated steel and a fume opening for discharging an exhaust fume while residing at the furnace operating position, and modifying each ofthe fume duct, flux additive system, ladle alloy addition system, and scrap handling systems to establish operative communication with the electric furnace at the furnace operating position.
According to another aspect ofthe present invention, there is provided an apparatus for revamping a steel making furnace installation to convert a basic oxygen furnace facility to an electric furnace facility, the basic oxygen furnace facility essentially including bearing pedestals to pivotally support a basic oxygen furnace vessel, a fume duct and transfer cars for ladles containing tapped steel and slag, the apparatus including the combination of spaced apart horizontal rails supported by the bearing pedestals, an electric furnace supported on a transfer car for movement along the rails between an operating position formerly occupied by basic oxygen furnace when supported by the bearing pedestals and a furnace exchange position, the electric arc furnace having a tapping orifice for discharging a burden treated in the furnace and a fume discharge opening, the furnace being position by the rails for tapping steel and slag to ladles on the transfer cars, and fume duct sections for delivering a fume received from the fume discharge opening to the fume duct. Brief description ofthe several views ofthe drawings
The present invention will be more fully understood when the following description is read in light ofthe accompanying drawings in which:
Figure 1 is a side elevational view of a basic oxygen furnace facility;
Figure 2 is a front elevation view taken along lines II-II of Figure 1 ;
Figure 3 is a side elevational view illustrating an electric furnace installation using existing and modifications to the facilities shown in Figures 1 and 2;
Figure 4 is a plan view ofthe electric furnace shown in Figure 3;
Figure 5 is a front elevational view taken along lines V-N of Figure 3;
Figure 6 is a schematic illustration ofthe material storage and handling systems for the electric furnace of Figures 3-5;
Figure 7 is a schematic illustration of a volume metric feeder for delivering material from a hopper to a new conveyor system according to the present invention;
Figure 8 is a schematic illustration of a conveyance system for supplying alloys to a ladle containing tapped steel at an alloying station; and
Figure 9 is ah enlarged fragmentary illustration of a modification to the electric arc furnace shown in Figure 3-5.
Detailed description ofthe invention
In Figures 1 and 2 there is illustrated an example of a basic oxygen furnace facility suitable for modification according to the present invention to provide for the installation and operation of an electric furnace. A basic oxygen furnace 10 has trunnions extending from diametrically opposite sides ofthe furnace and mounted in bearing assemblies 12 and 14 that are in turn supported by upstanding bearing pedestals 16 and 18 carried by massive reinforced foundation pedestals 20 and 22. Rails 24 and 26 extend in the space between the foundation pedestals for the movement of a plurality of transfer cars 28 used to transport ladles containing tapped steel and slag incident to the operation ofthe basic oxygen furnace. A trunnion pin for the furnace projects beyond the bearing assembly 12 for connection by a coupling to a furnace tilting drive 30 that is operated to tilt the furnace in a direction to drain slag over the furnace mouth opening lip into a slag pot on one ofthe transfer cars 28. The furnace is tilted in the opposite direction by drive 30 to supply liquid steel through an opening in the furnace wall to a teeming ladle on another ofthe transfer cars 28. A large opening in the top ofthe furnace discharges fume into an overlying fume collection and cooling hood 32 which supplies the fume to an evaporation chamber and filter equipment, not shown, to recover pollutants. The hood extends upwardly in an acute angle to the vertical and is provided with an opening in the upwardly directed wall ofthe hood to
introduce an oxygen lance 34 through the opening in the overlying fume cooling hood 32 and into the basic oxygen furnace 10 for introducing oxygen to the surface or into the metal in the furnace. It is, however, within the scope ofthe present invention to modify a basic oxygen furnace installation where the furnace is provided with a tuyerse in the bottom for the introduction of oxygen commonly known as Q-BOP. Another opening in the lower end of the overlying fume cooling hood receives a duct 36 connected to a hopper 38 which is supplied with fluxing and additive materials by conveyors 40 extending to a plurality of side- by-side storage bins 42. Building columns are used to form supports for floors at various elevations throughout the facility and provide access to the ancillary equipment such as the storage bins 42. There is illustrated a floor 44 supported by pillars 46 above ground level to carry rails 48 for a scrap charging car 50. The car 50 supports a scrap box 52 that can pivot about a shaft 54 by operation of a piston and cylinder assembly 56. Shown in Figure 2 is a ladle alloying station 58 located at a laterally spaced site at the furnace and used to deliver alloying materials from a hopper 60 located above a ladle on a transfer car 28. Sometimes there is no car and the scrap boxes are charged by means of an overhead crane.
The present invention seeks to maintain the material and process flow paths of the basic oxygen furnace installation by using the output from an electric furnace to provide supplies of liquid steel for use as consumed previously by the basic oxygen furnace. The conversion process is devised to minimize disruptions to the existing operations ofthe existing installation and minimize costs to the extent possible by the reuse of existing equipment and buildings. The design ofthe electric furnace used in the conversion according to the present invention permits operation ofthe furnace without requiring an overhead crane to charge the furnace and lift furnace components from their operating location. It is necessary however to abandon the basic oxygen furnace vessel 10, the bearing assemblies 12
and 14 and furnace tilt drive 30 as well as the bearing pedestals 16 and 18. Part ofthe fume cooling hood 32 and some but not all ofthe flux additive systems formed by the plurality of side-by-side bins 42 and the fluxing and additive conveyor system will be abandon.
As shown in Figures 3-5, ladle transfer cars 28 remain unchanged for movement along the same rails 24 and 26. The foundation pedestals 20 and 22 are modified by the removal ofthe bearing pedestals 16 and 18 and foundation pedestal 20 altered by forming a shelf 62 at the same elevation as the upper face surface 64 of foundation pedestal 22. Shelf 62 and surface 64 serves as support pads for rails 66 used to support a furnace transfer car 68. The rails extend beyond the existing foundation pedestals 20 and 22 to an adjacent bay in the steel making facility where the rails are supported by a superstructure 70 and form a furnace exchange site 72. The furnace transfer car is provided with wheels for movement by a winch 74 from a furnace operating position 76 where the transfer car is secured against movement against a stop by a ratchet, not shown. The winch 74 includes a cable 75 secured to opposite ends ofthe furnace transfer car. The furnace transfer car includes a furnace support frame 80 on which there is mounted an electric arc furnace 82 formed by a lower furnace shell 84, an upper furnace shell 86 and a furnace roof 88. The furnace roof 88 includes roof panels formed by an array of side-by-side coolant pipes with the coolant passageways communicating with annular upper and lower water supply headers 92 and 94, respectively, interconnected by radial distributing pipes to form a water circulating system communicating with service lines 96 containing water supply and return lines. The service lines 96 include a flexible section to avoid the need to disconnect the service lines when it is desired to lift the furnace roof alone or combined with the upper furnace shell a short distance, e.g., 24 inches, for servicing the lower furnace shell. The upper water supply header 92 encircles a triangular array of three apertures in a roof insert 94. The apertures are
dimensional and arranged to receive the phase A, B and C electrodes 98, 99 and 100 supported by electrode support arms 102, 104 and 106, respectively. Each ofthe electrode support arms is independently positioned vertically by support posts 108 restrained by horizontally spaced guides 110 in a newly formed superstructure 112 for vertical displacement by actuator 114 typical in the form of piston and cylinder assembly. The electrode support arms 102, 104 and 106 support water cooled cables for transmission of electrical current from transformers in a transformer vault 115 to the respective phase A, B and C electrodes.
A fume duct 116 extends vertically from an annular opening in the furnace roof between the upper and lower water supply headers 92 and 94 for exhausting fumes from the interior ofthe furnace to an enlarged and vertically spaced duct section 118. The vertical duct section 118 forms a replacement to a discarded section ofthe overlying fume hood 32. The vertical duct section 118 is joined to the remnant ofthe overlying fume hood 32 by the elbow 120. The duct 118 and elbow 120 are formed by side-by-side coolant pipes to provide thermal protection, the same construction as the overlying fume hood 32.
The furnace upper shell includes superimposed convolutions of coolant pipe supplied with coolant from spaced apart supply headers that are interconnected by vertical distribution pipes to form a water circulating system communicating with service lines 128 containing water supply and return lines. Metal panels may be supported by the coolant pipes ofthe furnace roof and the coolant pipe ofthe furnace upper shell for confinement ofthe fume to the interiors of these furnace components. The service lines 128 include a flexible section to avoid the need to disconnect the service lines when it is desired to lift the furnace roof combined with the upper furnace shell a short distance, e.g., 24 inches, for servicing the lower furnace shell. The convolutions of coolant pipe forming the upper furnace shell 86 are
interrupted by a scrap charge opening 132 in one quadrant and a slag discharge opening 134 in an adjacent quadrant ofthe annular configuration shell. The scrap charge opening 134 is used to introduce quantities of scrap at closely spaced apart intervals throughout the major portion ofthe furnace operating cycle and the scrap residing in a retractable chute of a scrap charger 136 serves as a media to prevent unwanted escape ofthe fume from the furnace in the scrap charger. A bunker 138 embodies a fabricated construction to supply scrap to the scrap charger 136. The scrap charger car 50 is relocated to move along installed rails 139. A slag door 140 is lifted to allow the flow of slag beyond a threshold formed by a carbon rod insert 142 which is supported by suitable brackets on the lower furnace shell 84 to a slag pot on a transfer car 28.
The furnace charging material for the most common steel making operation will be scrap which is preferable continuously introduced at closely spaced time increments. In addition to the charging ofthe furnace with scrap, direct reduction pellets, DRI, may be introduced to an opening 162, shown in Figure 4, in the roof insert by a chute 164 extending from a DRI storage hopper. The chute 164 is arranged at an angular relation to the vertical so that the DRI impacts with the metal bath at a site proximate to the triangular array of electrodes to take advantage ofthe highly heated area in the metal bath for rapidly melting the pellets of DRI material. There are additional openings 166 and 168 in the furnace roof. Openings 166 are used to insert carbon/oxygen lances, shown in Figure 6, for producing foamy slag. Openings 168 communicate with chutes 170 for introducing fluxing and carbon materials to the melt in the furnace. Liquid metal may also form a furnace charge or a part thereof. Typically, the liquid metal will comprise blast furnace iron when available and can be introduced to the furnace by use of a pouring tundish with wheels arranged for supporting the tundish on the rails 74 and 76. The tundish will include a launder arranged to allow the
introduction of liquid metal through openings formed by the slag discharge trough. A ladle will be carried by crane to tundish for introducing liquid metal to the tundish.
The refractory lining in the lower furnace shell is preferably constructed to allow a larger tonnage output at a shorter furnace operating cycle by maintaining a liquid metal heel provided by the configuration ofthe liquid metal cavity in the refractory after tapping is at least 70% preferably 100% ofthe heat before tapping. Such a liquid metal heel provides a substantial thermal benefit after tapping to maintain flat bath operation throughout the charging of scrap and/or other forms for charging material. Melting a newly introduced scrap charge combined with the introduction of heat by operation of electrodes can continue throughout the charging ofthe furnace. Figure 3 illustrates the use of a control 172 typically located in an operator pulpit and having a summation circuit receiving input signals from the load cells 174 on the furnace support frame 80 in load bearing contact with struts 176 affixed to the outer surface ofthe lower furnace shell 84. Electrical signals supplied by the load cells 174 corresponding to the weight ofthe furnace including the liquid metal heat which is modified by a signal to provide an output signal representing only the weight ofthe liquid metal heat. The weight ofthe liquid metal heat may be displayed in any convenient way such as a numerical read out 178. The read out will be used to control the furnace operation including start and stop of charging and tapping.
Mechanical shock due to tilting ofthe furnace in opposite directions for tapping and slag off is eliminated throughout the furnace operation cycle. The feature of operating the furnace while completely static, serves also to shorten the operating cycle time by allowing power on the electrodes throughout tapping, slagging and charging. Also, tapping of a heat is simplified as compared with tapping a basic oxygen furnace because the
ladles receiving slag and the stream of liquid steel remain stationary because the furnace is stationary throughout its operation.
Figure 6 schematically illustrates the continued use of bins 42 for direct reduction iron pellets which pass through gravimetric feeders 180, as shown in Figure 7, that are added to each ofthe bins for delivery ofthe pellets to suitably arranged conveyors 182 and 183 for introduction into the furnace using chute 164. Another suitably arranged conveyors 184 and 185supplies dolomite, lime, and carbon from respective supplies in individual ones ofthe bin's 42 to the furnace using chutes 170. The opening 166 in the furnace roof receives carbon/oxygen lances 186 connected by and using volume metric or gravimetric control supply lines to a batching hopper 188 communicating with a foaming slag carbon silo 190. The alloy station is relocated and expanded by the addition of a synthetic slag feed system that includes the addition of a jib crane 192 for introducing synthetic slag to a hopper 194 which in turn discharges desired quantities of synthetic slag through a chute to a ladle on a transfer car 28. Another chute, conducts a desired quantity of alloy material from a hopper 60 receiving supplies of alloy material from the relocated alloying supply vessel 198.
Figures 3-5 illustrate the preferred form of an electric furnace to carry out the conversion of a basic oxygen furnace installation. Figure 9 illustrates a modification to the electric arc furnace which essentially provides for the pivotal support ofthe lower furnace shell on the furnace car. For this purpose the furnace support frame 80 is provided with spaced apart rollers 200 rotatably supported by bearing assemblies. The bottom ofthe lower furnace shell is provided with spaced apart arcuate bars 202 in load bearing contact with the rollers 200. The entire furnace is supported on the furnace car by the rollers and can be tilted in opposite directions by operation of a piston cylinder assembly 204 mounted on the furnace car and its rod end clevis mounted to the lower furnace shell. The construction ofthe furnace
in all other respects will be the same as shown in Figures 3-5 and described hereinbefore. However, the present invention is equally applicable to other well known forms of steel making furnaces. For example, arc heating furnaces used to heat a metal charge by heat radiation from arcs passed between electrodes above the metal charge. Other furnace designs include an electrically conductive furnace bottom which forms part of an electrical circuit powered by direct current. Induction furnaces can also be installed which operate to heat a metal charge by either using inductors according to a transformer principle where the secondary winding is formed by a loop of liquid metal in a refractory channel or a coreless principle where induction coils surround the furnace wall and generates a magnetic field to impart energy to the metal charge in the furnace.
While the present invention has been described in connection with the preferred embodiments ofthe various figures, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiment for performing the same function ofthe present invention without deviating therefrom. Therefore, the present invention should not be limited to any single embodiment, but rather construed in breadth and scope in accordance with the recitation ofthe appended claims.
Claims
1. In a steel making installation having a basic oxygen furnace facility essentially including basic oxygen furnace vessel, pedestal bearings, furnace support pedestals, furnace tilting drive, oxygen lance, fume duct, flux additive system, ladle alloy addition system, and scrap handling systems, a method for revamping said steel making installation to convert the basic oxygen furnace facility to an electric fumace facility, said method including the steps of: discarding each of said basic oxygen furnace vessel, pedestal bearings, furnace tilting drive and oxygen lance; modifying said furnace support pedestals to form spaced apart horizontal rail support pads extending generally horizontally between a fumace operating position and a furnace exchange position; installing car rails on said spaced apart horizontal rail support pads; installing an electric furnace on a transfer car for movement along said car rails between said operating position and said furnace exchange position, the electric fumace having a tapping orifice for discharging treated steel and a fume opening for discharging exhaust fume while residing at said fumace operating position; and modifying each of said fume duct, flux additive system, ladle alloy addition system, and scrap handling systems to establish operative communication with said electric furnace at said fumace operating position.
2. The method according to claim 1 wherein said spaced apart horizontal rail support pads are established at an elevation sufficient to allow continued use of ladle cars.
3. The method according to claim 1 further including installing a scrap charger for introducing scrap through an opening in the side wall of said electric furnace.
4. The method according to claim 1 wherein said step of modifying a fume duct includes operatively coupling said fume duct to said furnace by adding a fume duct elbow to a vertical fume duct section extending to a roof opening in said electric furnace.
5. The method according to claim 1 wherein said basic oxygen fumace facility includes a plurality of hoppers and wherein said method includes the further step of using of some plurality of hoppers for introducing direct reduced iron pellets into said electric fumace
6. The method according to claim 5 including the further step of providing conveyors for delivering direct reduced iron pellets from said hoppers to chutes for introducing in said electric furnace.
7. The method according to claim 1 wherein said basic oxygen fumace facility includes a plurality of hoppers and wherein said method includes the further step of using of some plurality of hoppers for introducing dolomite, lime and carbon into said electric fumace
8. The method according to claim 7 including the further step of providing conveyors for delivering dolomite, lime and carbon from said hoppers to chutes for introducing in said electric furnace.
9. The method according to claim 1 wherein said electric furnace includes a plurality of electrodes extending through apertures in a fumace roof for establishing arcs to heat a fumace charge.
10. The method according to claim 8 wherein said electric art are maintained through consecutive operating cycles of said electric furnace.
11. The method according to claim 8 wherein said electric furnace includes a lower furnace shell with containing a tape hole in the tapping directly to a lade on a transfer car beneath said electric furnace.
12. A method for revamping a steel making furnace installation to convert a basic oxygen fumace facility to an electric arc furnace facility, said basic oxygen furnace facility essentially including basic oxygen furnace vessel, bearing pedestals, furnace tilting drive, oxygen lance, fume duct, transfer cars for ladles containing tapped steel and slag, said method including the steps of: discarding basic oxygen furnace vessel, bearing pedestals, furnace tilting drive and oxygen lance; using existing bearing pedestals to support spaced apart horizontal rails; installing an electric arc furnace on a transfer car moveable along said rails between an operating position and a furnace exchange position, the electric arc furnace having a tapping orifice for discharging a burden treated in the furnace and a fume discharge opening; coupling said fume discharge opening to said fume duct; and using said transfer cars for ladles containing tapped steel and slag to transport steel and slag from said electric furnace.
13. An apparatus for revamping a steel making furnace installation to convert a basic oxygen fumace facility to an electric furnace facility, said basic oxygen fumace facility essentially including bearing pedestals to pivotally support a basic oxygen furnace vessel, a fume duct and transfer cars for ladles containing tapped steel and slag, said apparatus including the combination of: spaced apart horizontal rails supported by said bearing pedestals; an electric fumace supported on a transfer car for movement along said rails between an operating position formerly occupied by basic oxygen furnace when supported by said bearing pedestals and a furnace exchange position, the electric arc furnace having a tapping orifice for discharging a burden treated in the fumace and a fume discharge opening, said fumace being position by said rails for tapping steel and slag to ladles on said transfer cars; and fume duct sections for delivering fume received from said fume discharge opening to said fume duct.
14. The apparatus according to claim 13 further including conveyors and discharge chutes for introducing direct reduced iron ore pellets and dolomite, lime and carbon into a roof of said electric furnace.
15. The apparatus according to claim 13 further including a scrap charger extending horizontally at one side of electric fumace for introducing scrap through an aperature in a side wall of said electric furnace.
16. The apparatus according to claim 13 further including a plurality of electrodes extending through apertures in a roof of said-electric for establishing arcs to heat a furnace charge.
17. The apparatus according to claim 13 further including a fume duct elbow and a vertical fume duct section for delivering fume from an opening in a roof of said electric furnace to fume duct forming part of said basic oxygen furnace facility.
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CN102252516A (en) * | 2011-06-08 | 2011-11-23 | 宝鸡铠丰科技发展有限公司 | Novel fused magnesia smelting electric arc furnace |
RU2493263C1 (en) * | 2012-07-20 | 2013-09-20 | Открытое акционерное общество "Северский трубный завод" | Method of steel making in arc-type steel-making furnace |
RU2533071C1 (en) * | 2013-10-15 | 2014-11-20 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") | Method of steel production |
RU2608010C1 (en) * | 2015-09-09 | 2017-01-11 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method of steel making in electric arc furnace |
RU2645170C1 (en) * | 2016-10-12 | 2018-02-16 | Общество с ограниченной ответственностью "Русское горно-химическое общество" | Method of steel making in arc-type electric steel making furnace |
CN108950132A (en) * | 2018-09-12 | 2018-12-07 | 中冶京诚工程技术有限公司 | A kind of electric furnace smelting device and method |
RU2770657C1 (en) * | 2021-11-08 | 2022-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Сибирский государственный индустриальный университет" ФГБОУ ВО "СибГИУ" | Method for steel melting from scrap in electric arc furnace |
EP3548640B1 (en) | 2016-12-02 | 2022-09-21 | Tenova S.p.A. | Convertible metallurgical furnace and modular metallurgical plant comprising said furnace for conducting production processes for the production of metals in the molten state, in particualr steel or cast iron |
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CN102252516A (en) * | 2011-06-08 | 2011-11-23 | 宝鸡铠丰科技发展有限公司 | Novel fused magnesia smelting electric arc furnace |
RU2493263C1 (en) * | 2012-07-20 | 2013-09-20 | Открытое акционерное общество "Северский трубный завод" | Method of steel making in arc-type steel-making furnace |
RU2533071C1 (en) * | 2013-10-15 | 2014-11-20 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") | Method of steel production |
RU2608010C1 (en) * | 2015-09-09 | 2017-01-11 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method of steel making in electric arc furnace |
RU2645170C1 (en) * | 2016-10-12 | 2018-02-16 | Общество с ограниченной ответственностью "Русское горно-химическое общество" | Method of steel making in arc-type electric steel making furnace |
EP3548640B1 (en) | 2016-12-02 | 2022-09-21 | Tenova S.p.A. | Convertible metallurgical furnace and modular metallurgical plant comprising said furnace for conducting production processes for the production of metals in the molten state, in particualr steel or cast iron |
CN108950132A (en) * | 2018-09-12 | 2018-12-07 | 中冶京诚工程技术有限公司 | A kind of electric furnace smelting device and method |
RU2770657C1 (en) * | 2021-11-08 | 2022-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Сибирский государственный индустриальный университет" ФГБОУ ВО "СибГИУ" | Method for steel melting from scrap in electric arc furnace |
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