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WO2008136027A1 - Boîte refroidie pour positionner des buses dans des fours électriques à arc - Google Patents

Boîte refroidie pour positionner des buses dans des fours électriques à arc Download PDF

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Publication number
WO2008136027A1
WO2008136027A1 PCT/IT2007/000336 IT2007000336W WO2008136027A1 WO 2008136027 A1 WO2008136027 A1 WO 2008136027A1 IT 2007000336 W IT2007000336 W IT 2007000336W WO 2008136027 A1 WO2008136027 A1 WO 2008136027A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooled box
ingots
ingot
tubular body
box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IT2007/000336
Other languages
English (en)
Inventor
Stefano Miani
Alessandro Barbano
Bruno Rubeo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Concast Standard AG
Original Assignee
Concast Standard AG
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 Concast Standard AG filed Critical Concast Standard AG
Priority to PCT/IT2007/000336 priority Critical patent/WO2008136027A1/fr
Priority to EP07736839A priority patent/EP2142873A1/fr
Publication of WO2008136027A1 publication Critical patent/WO2008136027A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
    • 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
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/02—Structural details of mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used
    • F23M5/025—Casings; Linings; Walls characterised by the shape of the bricks or blocks used specially adapted for burner openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • F27B3/20—Arrangements of heating devices
    • F27B3/205—Burners
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C2005/4626—Means for cooling, e.g. by gases, fluids or liquids
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/462—Means for handling, e.g. adjusting, changing, coupling
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0038—Heating elements or systems using burners removable
    • 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

  • a cooled box for the positioning of nozzles, such as burners, injectors and/or lances, within electric arc furnaces for founding steel .
  • nozzles auxiliary burners, injectors, and lances
  • nozzles auxiliary burners, injectors, and lances
  • nozzles auxiliary burners, injectors, and lances
  • Such boxes are commonly made by casting a monolithic piece of copper.
  • a channel is located which is sloped and suitable to house the nozzle. The inclination of the channel allows directing the nozzle as much as possible towards the centre of the furnace.
  • the burner placement such that the flame is near to the bath, and directed thereto, is not possible.
  • the channel conformation often determines a burner positioning such as to direct the flame at least partially towards the refractory material lining within the shaft. This causes the refractory early wear and imposes frequent maintenance activities on the furnace .
  • Fig. 1 illustrates the section of an electric arc furnace of a known type
  • Fig. 2 illustrates a cooled box of a known type operatively placed within a furnace
  • Fig. 3 illustrates a cooled box similar to the one of Figure 2, disassembled from the furnace
  • FIG. 4 schematically illustrates a perspective view of a cooled box in accordance with the invention
  • Fig. 5 illustrates the detail of a furnace similar to the one designated with V in Fig. 1, comprising a cooled box in accordance with the invention
  • Fig. 6 illustrates a front view of the cooled ox in accordance with the invention
  • Pig. 7 illustrates a side view of the cooled box in accordance with the invention
  • Fig. 8 illustrates a view of the section taken along the line VIII-VIII in Figure 6;
  • Fig.- 9- illustrates a view of the -cooled box -in accordance with the invention similar to the one in Fig.
  • Fig. 10 illustrates a plan view of a first step of processing an ingot suitable to manufacture the cooled box in accordance with the invention
  • Fig. 11 illustrates a view of the section taken along the line XI-XI in Figure 10
  • Fig. 12 illustrates a view of the section taken along the line XII-XII in Figure 10;
  • Fig. 13 illustrates three different views of a cap to be applied to the ingot in Figure 9;
  • Fig. 14 illustrates a plan view of a second step of processing an ingot suitable to manufacture the cooled box in accordance with the invention
  • Fig. 15 illustrates a view of the section taken along the line XV-XV of Fig. 14;
  • Fig. 16 illustrates a view of the section taken along the line XVI-XVI of Fig. 14; [0035].
  • Fig. 17 illustrates a side view of a third step of processing an ingot suitable to manufacture the cooled box in accordance with the invention
  • Pig. 18 illustrates a front view of the ingot in Fig. 14;
  • Fig. 19 illustrates a perspective view of a finished -ingot- suitable to manufacture the- cooled -box- in- accordance with the invention
  • Fig. 20 illustrates a perspective view of a finished ingot, similar to the one in Fig. 19;
  • Fig. 21 illustrates a perspective view of a finished ingot, similar to the one in Fig. 18;
  • Fig. 22 illustrates a front view of the assembled ingots during a first step of manufacturing the cooled box in accordance with the invention
  • Fig. 23 illustrates a front view of the assembled ingots during a second step of manufacturing the cooled box in accordance with the invention
  • Fig. 24 illustrates a different type of ingot in a view similar to the one in Fig. 11;
  • Fig. 25 illustrates a different type of ingot in a view similar to the one in Fig. 11;
  • Fig. 26 illustrates a different type of ingot in a view similar to the one in Fig. 11; [0045] .
  • Fig. 27 illustrates an enlargement of the detail designated with XXVII in Fig. 26;
  • Fig. 28 illustrates a view similar to the one in Fig. 22 of a first alternative embodiment of the tubular body according to the invention
  • Fig. 29 illustrates a view similar to the one in Fig. 22 of a second alternative embodiment of the tubular"bodyaccording to the-invention
  • Fig. 30 illustrates a front view of the cooled box shield according to the invention
  • Fig. 31 illustrates a view similar to the one in Fig. 7 of another embodiment of the cooled box according to the invention.
  • a cooled box (or simply “box”) has been generally designated with 1.
  • the cooled box 1 is located within an opening made in the side wall of an arc furnace 2 (see
  • the arc furnace 2 comprises a refractory material inner lining 3, a cooling system 4 and, upon operation, a molten metal bath 5.
  • the cooled box 1 comprises a tubular body 10.
  • the tubular body 10 comprises, in turn, a plurality of bars or ingots 20 which are mutually fastened and arranged such as to be the side walls of the same tubular body.
  • the tubular body 10 defines an axis X.
  • the ingots 20 are arranged in the axis X direction (with the only exception being a small angle ⁇ described below) and are mutually juxtaposed along-contact—lines—and/or- sur-faces -being—also- arranged.. in the axial direction.
  • the ingots 20 are mutually fastened along junction lines also arranged in the axial direction.
  • the tubular body 10 of the cooled box 1 according to the invention comprises a circumferentially segmented structure.
  • the ingots are arranged such as to form an approximately frusto-conical or frusto- pyramidal shape .
  • the ingots are arranged such that a longitudinal axis Y of each individual ingot is enclosed in a plane passing along the X-axis.
  • the contact and/or junction surfaces between the ingots can also be enclosed in a plane passing along the X-axis.
  • the ingots are arranged such that a longitudinal axis Y of each individual ingot forms an angle ⁇ with the axis X having a width ranging between 1° and 4°, preferably 2° (see Fig. 8 and 17) .
  • the ingots can be arranged in different manners, for example such as to form an approximately cylindrical or prismatic shape. That is, the ingots can be arranged such that a longitudinal axis Y of each individual ingot is -parallel- to-the-ax-i-s—Xr
  • the tubular body 10 of box 1 comprises a channel 11 therein.
  • a channel 11 is suitable to house a nozzle 30 of a type known per se.
  • the channel 11 has a regular decagon-shaped section.
  • the channel section can take other shapes, for example the shape of another, either regular or non- regular, polygon; a circumference; an ellipse; an V 8'; and the like.
  • the channel 11 has a diameter ranging between 100 and 400 mm, preferably between 120 and 250 mm.
  • the ingots 20 comprise a channel 21 for the cooling fluid to circulate therein, preferably for cooling water circulation.
  • the cooling channel 21 of each ingot is preferably connected to the cooling channels of the other ingots, such as to form an individual cooling circuit 12 running through the whole tubular body 10.
  • the channel 21 of each ingot 20 is connected in series with the channels of the two ingots adjacent thereto, with the only exception being the first and the last ingots in the pathway. These latter channels are suitable to be connected to the feeding line and to the outflow line of the cooling fluid, respectively.
  • the individual channels are differently connected, for example according to an in-parallel scheme or according to a mixed in-series/parallel scheme. [0067] .
  • each individual ingot 20 comprises a shoulder 23 on the side intended to be the inner wall of the tubular body 10.
  • the tubular body 10 comprises, inside the channel 11, a diaphragm 13 comprising all the -shoulders—2-3—of-al-1—the—i-ngot-s—20 ⁇
  • the box according to the invention further comprises a shield 6 and a protective pipe fitting 7.
  • the shield 6 and the protective pipe fitting 7 allow completely closing a standard quadrangular-shaped opening obtained in the furnace side wall, while allowing any type of inclination of the tubular body 10.
  • the inclination of the axis X of the tubular body 10 relative to the shield 6 ranges between 30° and 60°, preferably it ranges between 40° and 50°.
  • the length of each ingot ranges between 350 and 550 mm, preferably between 420 and 480 mm. As it can be clearly seen in Fig. 7, 8, and 9, the usable length of the tubular body 10 in the whole is substantially equal to the length of the individual ingot 20 .
  • the individual ingots 20 are made from a single block of copper.
  • the individual ingots 20 can be made from a single block of other material, adapted to be used at the temperatures which are characteristic of the furnace, such as steel, sinterized materials, for example ceramic materials (such as alumina, or aluminium oxide, Al 2 O 3 ) or so-called superalloys of the Inconel ® type (sold by Special Metals Corporation) or of the Hastelloy ® type (sold by Haynes International), or the like.
  • ceramic materials such as alumina, or aluminium oxide, Al 2 O 3
  • superalloys of the Inconel ® type sold by Special Metals Corporation
  • Hastelloy ® type sold by Haynes International
  • the individual ingots 20 are made from an individual monolithic block, as schematically shown in Fig. 11 and 15. [0077] . In accordance with other possible embodiments, the individual ingots can be made in several pieces. [0078] .
  • the ingots can advantageously comprise a main body 22 and a "nose" 24.
  • main body 22 is meant that ingot portion which, in the operative configuration in which the box 1 is mounted and ready to operate, is nearest to the shield 6.
  • the main body 22 is run-through--by—fche-eoo-1-ing— ⁇ hanne-l— ⁇ 2-1- ⁇ -
  • the nose 24 of the ingot 20 is that portion which, in the operative configuration in which the box 1 is mounted and ready to operate, is the most distant from the shield 6.
  • the nose 24 is the ingot portion most exposed to wear. It is not run through by the cooling channel since, being particularly exposed to wear, liquid leakages could easily occur within the shaft .
  • the ingot may comprise a nose 24 made of a material which is different from the one composing the main body 22.
  • the ingot may comprise a plating 25 of the nose 24, i.e. a covering of the nose 24 made with a layer of a material different from the one composing the main body 22 and the nose 24.
  • both the ingot 20 main body 22, the nose 24, and the plating 25 can be made of copper, steel, ceramic material or superalloy.
  • the nose 24 or the plating 25 of the individual ingot 20 are interchangeable, such as to be capable of being easily replaced during the working life of the box 1 without having to remove the main body 22 of the ingot 20 • from—fche—tttbuiar—body—1-0 ⁇ -
  • the ingots 20 may comprise a surface treatment 26 of the nose 24.
  • This surface treatment can, for example, comprise an anti-wear material layer applied by plasma spraying.
  • Anti-wear materials are, for example, ceramic materials such as alumina (aluminium oxide, Al 2 O 3 ) and zirconia
  • the tubular body 10 comprises a plurality of mutually fastened ingots 20.
  • the ingots are mutually fastened by welding along their side surfaces.
  • FIG. 28 a tubular body 10 is schematically illustrated in which the ingots 20 are mutually fastened by means of shape coupling, particularly through a dovetail.
  • Fig. 29 a tubular body 10 is instead schematically illustrated in which the ingots 20 are simply mutually juxtaposed and fastened through-an- ⁇ outer—r-immi-ng—1-4—
  • the box 1 further comprises a sealing ring 15 to seal any gap between the nozzle 30 and the channel 11, particularly between the nozzle and diaphragm 13.
  • the sealing ring 15 avoids, that the flames within the furnace are canalized within any gap between the nozzle 30 and the diaphragm 13 and that therefore dangerously come back along the channel 11.
  • the sealing ring 15 is made of a material suitable to create a barrier resistant to the operative temperatures which are characteristic of the inside of the arc furnace (1500-1700 0 C) .
  • a material having these features can, for example, be obtained from ceramic fibers, glass fibers, steel fibers, or the like. The fibers can be mutually braided, weaved or packed to form a mat .
  • the tubular body 10 comprises a cooling circuit 12 running therethrough, thus allowing exposure—to—t-he—furnace-wor-king—temperatures-.
  • the cooling circuit 12 comprises, as stated above, the set of the cooling channels 21 of ingots 20. Furthermore, the cooling circuit 12 comprises a ring 16 which is suitable to connect the individual cooling channels 21 of the ingots 20.
  • the ring 16, as illustrated in Fig. 23, is particularly suitable to create a passageway which allows the fluid exiting from an ingot channel to be directed in the next ingot channel. Therefore, the ring 16 is suitable to connect in series the individual cooling channels 21. [0094] . In accordance with other embodiments (not illustrated) , the ring 16 is suitable to differently connect the individual channels 21, for example according to an in-parallel scheme, or according to a mixed in series/parallel scheme. [0095] .
  • the cooling circuit is completed by two hoses 17 and 18 for connecting the circuit 12 to the feeding and outflow lines of the cooling fluid.
  • the method for manufacturing the cooled box 1 first comprises providing the tubular body 10. Therefore, a method for providing the tubular body 10 according to -the— ⁇ nvention—-wi-1-1—be—f-i-rst described—below—-Such—a. method comprises the steps of:
  • the arrangement of the ingots comprises the step of drawing the material, particularly copper.
  • the arrangement of the ingots may comprise a sintering step (for materials such as ceramics and superalloys) , or a casting and/or moulding step (for materials such as copper and steel) .
  • the arrangement of an individual ingot comprises a step of applying a shoulder 23 (see Fig. 14 and 15) , for example by welding. [00101] .
  • the arrangement of the ingots 20 comprises arranging two special ingots (see Fig. 20 and—21-)—which—are-intended—to—be—locafeed-as-the-first-and- last of the series, respectively. These ingots have an appendix which allows extending one of the two conducts 211 and 212, respectively. In Fig. 22 and 23, it can be seen that these ingots are intended to house the hoses 17 and 18.
  • the creation of a cooling channel 21 within each ingot 20 comprises a double step of longitudinal deep drilling of the ingot 20. Thereby, two conducts 211 and 212 are produced which are rectilinear and parallel relative to each other. [00103] .
  • a further milling step provides the third conduct 213 transversal to the first two (Fig. 10 to 12) .
  • the cooling channel 21 is completed by the insertion of a cap 214 (Fig. 13) suitable to restore the sealing of channel 21 at the milling (Fig. 14 to 16) .
  • the cap 214 can, for example, be locked in situ by welding.
  • the arrangement of n ingots provides for the creation of two contact side surfaces 27 and 28 which form, relative to each other, a 360°/n wide angle ⁇ (see Pig. 18) .
  • This operation can be obtained, for example, by machine tooling.
  • the thus-obtained side surfaces 27 and 28 are intended to contact the -corresponding ⁇ side-sur ⁇ faces of—the-ad-jacent-ingots. [00105] .
  • an optional angle ⁇ can be also introduced between the axis F of the individual ingot and the axis X of the tubular body (see Fig. 17) .
  • a tubular body 10 which has a frusto-conical or frusto-pyramidal shape. Instead, if the angle ⁇ is maintained null, a tubular body 10 is obtained which has a cylindrical or prismatic shape.
  • the step of arranging the individual ingot 20, for example by sintering or casting can already comprise other steps separately described above.
  • the step of arranging the individual ingot 20 can, for example, comprise the steps of arranging the cooling channel, side surfaces 27 and 28, and relative angles ⁇ and ⁇ , arranging the shoulder 23, etc.
  • Such an embodiment of the net-shape method complicates the manufacturing step of the ingot 20, but sharply ' reduces the total number of steps of the method.
  • the step of mutually fastening the ingots 20 comprises welding an ingot to the adjacent ingot along the edges of the contact side surfaces 27 and 28, respectively.
  • the step of mutually fastening the ingots 20 may comprise mutually joining the ingots, (for example by means of a dovetail joint) or the insertion of an outer rimming. [00109].
  • the step of connecting the individual cooling channels 21 to form an individual cooling circuit 12 comprises the addition of a ring 16 to the rear portion of the tubular body 10.
  • the method for providing the cooled box 1 according to the invention comprises the steps of:
  • the step of arranging the shield comprises the steps of cutting a quadrangular metallic plate 60 having a size suitable to close the opening made in the furnace side wall.
  • a hole is required to be made having such a shape and size as to snugly accommodate the tubular body 10 in the selected orientation (see Fig. 30) .
  • FIG. 31 In- accordance- with- - an- embodiment,- -the— method, for providing the cooled box 1 also comprises the steps of providing and fastening the protective pipe fitting 7.
  • the protective pipe fitting 7 has the purpose of closing the space that has been left opened between the shield 6 and the tubular body IQ .
  • the use of this protective pipe fitting allows carrying out a tubular body 10 consisting of ingots of an individual length.
  • the use of this protective pipe fitting further allows inclining the tubular body relative to the shield 6 as desired. [00113] .
  • ingots 20 having variable lengths could be produced, such as to obtain a snug adhesion of the shield 6 to the tubular body 10, despite the inclination of the latter.
  • Such an embodiment is schematically illustrated in Fig. 31.
  • the particular circumferentially segmented structure of the tubular body 10 allows to the same body to dilate and shrink following temperature-induced deformations, without that, for this, crackings or flaws occur in the metallic mass .
  • the above-described structure of the tubular body 10 can, in fact, be compared to an isostatic structure—in-- which —the- -dilatations—imposed— by——£he- temperature do not induce high stress states .
  • the monolithic block structure of the conventional type can without doubt be compared to a highly hyperstatic structure in which a dilatation imposed by the temperature necessarily induces also potentially very high stress states.
  • the method for manufacturing the cooled box 1 according to the invention can be carried . out through a sequence of technologically simple steps (drawing, drilling, milling, welding, etc.), without having to employ complex and costly technologies, such as casting.
  • the particular conformation of the cooling channels 21 can allow, if required, to extend the drilling so as to open the conduct 211 or 212 on the ingot nose 24. This possibility allows for the insertion of a further nozzle having a reduced size to be flanked to the main nozzle 30. Relative to a diameter of channel 11 of about 200 mm, the diameter of conduct 211 or 212 is about 20 mm.
  • the ingot intended to accommodate the auxiliary nozzle is of larger dimensions than the other ingots 30.
  • the cooled box 1 according to the invention due to the particular conformation thereof, allows for an efficient protection, both thermal and mechanical, of the nozzles 30.
  • the particular structure of the cooled box 1 according to the invention allows bringing the nozzles 30 very near to . the molten metal bath, and thus allows improving the nozzles efficacy.
  • the burner efficiency takes great advantage from the fact that it is located near the bath and oriented thereto. This placement further preserves the refractory coating from early wear. If, on the other hand, as in the prior art solution, the burner is located spaced from the bath and is incorrectly oriented, it loses efficacy and determinates a substantial wear of the refractory.
  • the increased rise towards the inside of the furnace must necessarily be accompanied by an increased mechanical strength. In fact, while the metallic material is loaded inside the furnace, the risk that impacts occur on the nose of the tubular body 10 is high.
  • the particular structure of the box 1 according to the invention proved to be extremely solid, such as to absorb the metallic material impacts without experiencing
  • the cooled box structure according to the invention further allows reducing by about 50% of the metallic mass employed as compared with the monolithic block structure of the cooled boxes of a conventional type, and kept any other features unchanged.
  • [00124] It is clear that variations and/or additions to what has been described and illustrated above may be provided. [00125] . Generally, all the features described above with relation to specific possible embodiments can be carried out independently from each other.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

La présente invention porte sur une boîte refroidie (1) pour positionner des buses (30) dans des fours électriques à arc (2). La boîte comporte un corps tubulaire (10), lequel comporte à son tour une pluralité de lingots (20) qui sont mutuellement fixés et agencés de façon à être les parois latérales du corps tubulaire.
PCT/IT2007/000336 2007-05-07 2007-05-07 Boîte refroidie pour positionner des buses dans des fours électriques à arc Ceased WO2008136027A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IT2007/000336 WO2008136027A1 (fr) 2007-05-07 2007-05-07 Boîte refroidie pour positionner des buses dans des fours électriques à arc
EP07736839A EP2142873A1 (fr) 2007-05-07 2007-05-07 Boîte refroidie pour positionner des buses dans des fours électriques à arc

Applications Claiming Priority (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041057A1 (de) * 2009-09-10 2011-04-21 Saar-Metallwerke Gmbh Brennerplattform und Brennersystem umfassend eine Brennerplattform für einen Lichtbogenofen
ITUD20130008A1 (it) * 2013-01-25 2014-07-26 Ferriere Nord Spa Apparato di iniezione
ITUD20130007A1 (it) * 2013-01-25 2014-07-26 Ferriere Nord Spa Apparato di iniezione
CN111271733A (zh) * 2020-03-02 2020-06-12 北京航空航天大学 燃烧加热器
EP4217675A1 (fr) * 2020-09-28 2023-08-02 Paul Wurth S.A. Buse refroidie échangeable avec passage d'injecteur en céramique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138091A1 (de) * 1990-11-20 1992-05-21 Mitsubishi Materials Corp Rohrfoermiger wassergekuehlter mantel fuer oefen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138091A1 (de) * 1990-11-20 1992-05-21 Mitsubishi Materials Corp Rohrfoermiger wassergekuehlter mantel fuer oefen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041057A1 (de) * 2009-09-10 2011-04-21 Saar-Metallwerke Gmbh Brennerplattform und Brennersystem umfassend eine Brennerplattform für einen Lichtbogenofen
ITUD20130008A1 (it) * 2013-01-25 2014-07-26 Ferriere Nord Spa Apparato di iniezione
ITUD20130007A1 (it) * 2013-01-25 2014-07-26 Ferriere Nord Spa Apparato di iniezione
CN111271733A (zh) * 2020-03-02 2020-06-12 北京航空航天大学 燃烧加热器
EP4217675A1 (fr) * 2020-09-28 2023-08-02 Paul Wurth S.A. Buse refroidie échangeable avec passage d'injecteur en céramique

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