EP0064449B1 - Einrichtung zum Einblasen von Spülgas in einen Konverter zum Raffinieren von Metallen - Google Patents

Einrichtung zum Einblasen von Spülgas in einen Konverter zum Raffinieren von Metallen Download PDF

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Publication number
EP0064449B1
EP0064449B1 EP82400731A EP82400731A EP0064449B1 EP 0064449 B1 EP0064449 B1 EP 0064449B1 EP 82400731 A EP82400731 A EP 82400731A EP 82400731 A EP82400731 A EP 82400731A EP 0064449 B1 EP0064449 B1 EP 0064449B1
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EP
European Patent Office
Prior art keywords
tuyeres
gas
converter
tube
flattened
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.)
Expired
Application number
EP82400731A
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English (en)
French (fr)
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EP0064449A1 (de
Inventor
Roger Duhomez
Guy Quenton
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FRANCAISE DES ACIERS SPECIAUX Cie
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FRANCAISE DES ACIERS SPECIAUX Cie
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Application filed by FRANCAISE DES ACIERS SPECIAUX Cie filed Critical FRANCAISE DES ACIERS SPECIAUX Cie
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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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases

Definitions

  • the present invention relates to a device for blowing nozzles for mixing gas in a converter for refining liquid metals using a lance, for example a steelworks converter.
  • Such a stirring gas can be a neutral gas, such as nitrogen or argon, or an oxidizing and cooling gas, such as steam or carbon dioxide, or a weakly oxidizing gas. , such as ordinary air, excluding strongly oxidizing gases, such as pure oxygen, which would cause much too rapid wear of the nozzles according to the invention.
  • a neutral gas such as nitrogen or argon
  • an oxidizing and cooling gas such as steam or carbon dioxide
  • a weakly oxidizing gas such as ordinary air, excluding strongly oxidizing gases, such as pure oxygen, which would cause much too rapid wear of the nozzles according to the invention.
  • porous refractories the open porosity of which, possibly oriented, makes possible the passage of a gas under pressure through the refractory mass.
  • the object of the present invention is to make possible under good conditions of industrial operation the blowing of stirring gas through the bottom of a converter, and even through its lateral coating if necessary, even if the temperature of the metal bath to be refined greatly exceeds 1,660 ° C., and even if the basic slag deposit on the blowing device is low or zero.
  • the subject of the present invention is a device for blowing stirring gas through the bottom or the wall of a liquid metal refining converter, constituted by a set of nozzles with a single tube arranged throughout the thickness of the compact refractory lining of the converter and wearing out with it, characterized in that the tube constituting each of the nozzles is flattened over the entire consumable length of the nozzle, in that the width of the internal gas passage section in the flattened tube is at most equal to one millimeter, and preferably close to 0.5 millimeter, in that the base of each of said tubes, in principle cylindrical, passes through a steel plate to which it is brazed and in that that said steel plate constitutes one of the walls of a distribution chamber between the nozzles of the stirring gas supplied with this gas by a pipe, said chamber being fixed by means of said plate on the external face of the cu converter irasse.
  • each of the nozzles contains at least one longitudinal metal wire, the diameter of which guarantees the exact width of the flattened part of the tube constituting the nozzle.
  • the steel plate traversed by all the tubes of the same set of nozzles is surmounted by a layer of compacted packed refractory material, constituting a safety layer, through which the said paths pass. tubes diverging from each other from said plate.
  • each tube is housed in a saw cut made over the entire length of the corresponding brick.
  • the set of nozzles is arranged in a straight line and several particular bricks of the same row of the wear coating can each contain on their edge one of these nozzles, or even two.
  • the set of nozzles is arranged along several neighboring and parallel straight lines, and, according to these straight lines, several particular bricks of the same row of the wear coating may each contain on their edge one or two of these nozzles.
  • One of the main advantages of the invention is that the installation of this device is easy, easier than that of the known permeable elements: thus, the gas distribution chamber is placed outside the breastplate of the converter ; in the thickness of the safety refractory layer, the small tubes of the same set are spread apart in an umbrella and diverge from each other; in the refractory layer wear, each tube is housed in a saw cut on the length of the brick. This installation is easier than that of porous plugs or permeable elements.
  • An additional advantage of the device according to the invention is that the principle of mounting the bricks constituting the bottom or the wall of the refining container is not modified due to the installation of the nozzles according to the invention.
  • Another advantage of the invention is greater security.
  • a cavity for example of 30 millimeters in diameter if one wishes run a 27-millimeter tube to supply the porous plug or permeable element with mixing gas. This cavity offers a certain risk in the event of excessive wear or breakthrough of the permeable element.
  • the safety layer is constituted, in the area of the set of nozzles, by a mass of dolomite, or of magnesia, tarred, groomed, compact, and crossed by the network of thin tubes, which greatly limits the risk of liquid steel infiltration.
  • the safety refractory layer passes through downstream of the mixing gas distribution chamber between the different nozzles. In other words, it is the individual circuit of each nozzle which passes through the safety layer, and not a collective supply. This provision greatly limits the severity of the consequences of a possible infiltration of metal into the safety layer.
  • the essential advantage of the blowing device according to the invention is to achieve a better resistance of the bottom of the converter to wear during refining of the bath, and this without the need to permanently obtain on the bottom the deposit of a protective layer of magnesia slag.
  • Figure 1 In Figure 1 are shown four nozzles 1, 2, 3, 4 whose base 1a, 2a, 3a, 4a is made of cylindrical copper tubes, the consumable length of 1b, 2b, 3b, 4b is made of the same tubes as their base, but flattened according to Figures 2 or 3, the intermediate part 1c, 2c, 3c, 4c used to connect the cylindrical part to the flattened part.
  • each of these four nozzles is brazed on the steel plate 5, which constitutes one of the walls of the distribution chamber 6 supplied with stirring gas via the pipe 7.
  • the bases of the nozzles, at a are tubes with an inside diameter of 2 mm and an outside diameter of 4 mm.
  • the cross section of the flattened part, visible and magnified 10 times in FIG. 2 has 0.5 mm of internal width, 2.5 mm of internal length, 2.5 mm of external width, and 4.5 mm of length outside.
  • the chamber 6 feeds ten nozzles (of which only 4 are in the plane of FIG. 1, three others in front of the plane of the figure and three others behind this plane), which are all brazed to the plate 5.
  • the bases of the nozzles, in a are tubes with an internal diameter of 4 mm and an external diameter of 6 mm.
  • the cross section of the flattened part, visible and magnified 10 times in FIG. 3, has 0.5 mm of internal width, 6 mm of internal length, 2.5 mm of external width, and 8 mm of external length.
  • the chamber 6 supplies 14 nozzles (only 4 of which are in the plane of FIG. 1 which are all brazed to the plate 5).
  • FIGS. 4 and 5 The installation of a device according to the invention in the bottom of the steelworks converter considered in this example is visible in FIGS. 4 and 5.
  • the distribution chamber 6 is fixed via the plate 5 to the breastplate 8 of the steelworks converter.
  • the four flattened tubes 1c, 2c, 3c, 4c travel diverging, from the plate 5, in a layer 9 of tarred, tarred magnesia , compact, disposed between two bricks 10 and 11 of the safety lining 12 of the refractory bottom.
  • each of the tubes is housed in a saw cut 14, visible in FIG. 5, practiced above all the length of each of the corresponding bricks 15a, 15b, 15c, 15d, length which is equal at 500 mm.
  • the nozzles can be arranged along several straight lines parallel to each other, each of the straight lines being similar and parallel to that of FIG. 5.
  • FIG. 4 in its left part, a porous plug 16 of known type, occupying the entire height of the wear layer 13, and supplied by a tube 17 of 27 mm in diameter outside which passes through a cavity 18 formed in the security layer 12, this cavity 18 being of an approximate diameter of 30 mm.
  • a porous plug 16 of known type, occupying the entire height of the wear layer 13, and supplied by a tube 17 of 27 mm in diameter outside which passes through a cavity 18 formed in the security layer 12, this cavity 18 being of an approximate diameter of 30 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (7)

1. Vorrichtung zum Einblasen von Rührgas durch den Boden oder die Wand eines Konverters zum Frischen von flüssigen Metallen, welche Vorrichtung einem Satz von Düsen aus einem einzigen Rohr aufweist, die quer durch die gesamte Dicke der kompakten hitzebeständigen Auskleidung des Konverters angeordnet sind und sich mit dieser verschleißen, dadurch gekennzeichnet, daß das Rohr, welches jede der Düsen bildet, über seine gesamte verbrauch- bzw. nutzbare Länge (1b) abgeflacht ist, daß die Weite des inneren Querschnittes des Gasdurchlasses im abgeflachten Rohr (1b) höchstens 1 mm beträgt, daß die Basis (1a) jedes der Rohre, die im Prinzip zylindrisch ausgebildet ist, eine Stahlplatte (5) durchsetzt, an welche sie angeschweißt ist, und daß die Stahlplatte (5) eine der Wände einer Verteilerkammer (6) zwischen den Düsen für das Rührgas bildet, der das Gas durch eine Leitung (7) zugeführt wird, und daß die Kammer (6) unter Zwischenschaltung der Platte (5) an der Außenfläche des Panzers bzw. Mantels (8) der Konverters befestigt ist.
2. Vorrichtung zum Einblasen nach Anspruch 1, dadurch gekennzeichnet, daß die Weite des inneren Querschnittes des Rührgasdurchlasses im abgeflachten Rohr (1 b) jeder der Düsen in der Größenordnung von 0,5 mm liegt.
3. Vorrichtung zum Einblasen nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß das jede Düse darstellende Rohr wenigstens einen in Längsrichtung verlaufenden Metallfaden (19) aufweist, dessen Durchmesser die genaue Breite des abgeflachten Abschnittes des Rohres gewährleistet.
4. Vorrichtung zum Einblasen nach einem der Ansprüche 1, 2 und 3, dadurch gekennzeichnet, daß die von allen Rohren (1c), (2c), (3c), (4c), ein und desselben Satzes von Düsen durchsetzte Stahlplatte (5) von einer festgestampften, kompakten Schicht aus hitzebeständigem Material überlagert ist, die eine Sicherheitsschicht (12) bildet, durch welche die Rohre (1c) verlaufen, indem sie ausgehend von dieser Platte voneinander divergieren.
5. Vorrichtung zum Einblasen nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß in den Steinen der Verschleißschicht (13) der hitzebeständigen Auskleidung, welche die Sicherheitsschicht (12) überlagert, jedes der abgeflachten Rohre (1b) in einem Sägeschnitt (14) gelagert ist, der über die gesamte Länge des entsprechenden Steines ausgebildet ist.
6. Vorrichtung zum Einblasen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Satz von Düsen in gerader Linie angeordnet ist und daß jede der Düsen einem bestimmten Stein einer gleichen Lage in der Verschleißschicht entspricht.
7. Vorrichtung zum Einblasen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Satz von Düsen entlang mehreren geraden, benachbarten und parallelen Linien angeordnet ist und daß Lage der Verschleißverkleidung jeder an ihrem Rand ein oder zwei dieser Düsen enthalten können.
EP82400731A 1981-04-24 1982-04-23 Einrichtung zum Einblasen von Spülgas in einen Konverter zum Raffinieren von Metallen Expired EP0064449B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400731T ATE10509T1 (de) 1981-04-24 1982-04-23 Einrichtung zum einblasen von spuelgas in einen konverter zum raffinieren von metallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8108188 1981-04-24
FR8108188A FR2504664A1 (fr) 1981-04-24 1981-04-24 Dispositif de soufflage de gaz de brassage dans un convertisseur d'affinage des metaux

Publications (2)

Publication Number Publication Date
EP0064449A1 EP0064449A1 (de) 1982-11-10
EP0064449B1 true EP0064449B1 (de) 1984-11-28

Family

ID=9257747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400731A Expired EP0064449B1 (de) 1981-04-24 1982-04-23 Einrichtung zum Einblasen von Spülgas in einen Konverter zum Raffinieren von Metallen

Country Status (6)

Country Link
US (1) US4413815A (de)
EP (1) EP0064449B1 (de)
JP (1) JPS57181319A (de)
AT (1) ATE10509T1 (de)
DE (1) DE3261349D1 (de)
FR (1) FR2504664A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146079A2 (de) * 1983-12-12 1985-06-26 Arbed S.A. Gasdurchlässiger Baukörper aus feuerfestem Material
EP0155255A2 (de) * 1984-03-15 1985-09-18 VOEST-ALPINE Aktiengesellschaft Spüleinrichtung für ein metallurgisches Gefäss
EP0232244A2 (de) * 1986-02-03 1987-08-12 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Spüleinrichtung für ein metallurgisches gefäss
EP0403466A2 (de) * 1989-06-13 1990-12-19 VOEST-ALPINE Industrieanlagenbau GmbH Spüleinrichtung für ein metallurgisches Gefäss

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8600608A (nl) * 1986-03-10 1987-10-01 Hoogovens Groep Bv Converter voor het bereiden van staal.
US4741515A (en) * 1986-10-20 1988-05-03 Bethlehem Steel Corporation Apparatus for introducing gas into a metallurgical vessel
US4758269A (en) * 1987-02-24 1988-07-19 Allegheny Ludlum Corporation Method and apparatus for introducing gas into molten metal baths
JPH058548Y2 (de) * 1987-03-11 1993-03-03
US4840354A (en) * 1988-06-22 1989-06-20 Labate M D Stirring brick with shaped gas volume control openings

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE609232A (fr) * 1961-10-16 1962-04-16 Centre Nat Rech Metall Perfectionnements aux procédés d'affinage de la fonte
LU54172A1 (de) * 1967-07-26 1969-05-21
US3901445A (en) * 1974-11-08 1975-08-26 Pullman Inc Gas burner - lance construction
FR2322202A1 (fr) * 1975-08-29 1977-03-25 Siderurgie Fse Inst Rech Procede d'elaboration d'acier par soufflage d'oxygene
US4298192A (en) * 1978-05-26 1981-11-03 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same
FR2455008A1 (fr) * 1979-04-25 1980-11-21 Siderurgie Fse Inst Rech Piece refractaire a permeabilite selective et orientee pour l'insufflation d'un fluide

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146079A2 (de) * 1983-12-12 1985-06-26 Arbed S.A. Gasdurchlässiger Baukörper aus feuerfestem Material
EP0146079A3 (en) * 1983-12-12 1987-01-07 Arbed S.A. Gas-permeable refractory plug
US4647020A (en) * 1983-12-12 1987-03-03 Arbed S.A. Gas-permeable element of a refractory material
EP0155255A2 (de) * 1984-03-15 1985-09-18 VOEST-ALPINE Aktiengesellschaft Spüleinrichtung für ein metallurgisches Gefäss
EP0155255A3 (de) * 1984-03-15 1986-07-16 VOEST-ALPINE Aktiengesellschaft Spüleinrichtung für ein metallurgisches Gefäss
EP0232244A2 (de) * 1986-02-03 1987-08-12 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Spüleinrichtung für ein metallurgisches gefäss
EP0232244A3 (en) * 1986-02-03 1988-04-06 Aktiengesellschaft Voest-Alpine Flushing arrangement for a metallurgical vessel
US4744546A (en) * 1986-02-03 1988-05-17 Voest-Alpine Aktiengesellschaft Flushing arrangement for a metallurgical vessel
AU599949B2 (en) * 1986-02-03 1990-08-02 Voest-Alpine Industrieanlagenbau Gesellschaft Mbh A flushing arrangement for a metallurgical vessel
EP0403466A2 (de) * 1989-06-13 1990-12-19 VOEST-ALPINE Industrieanlagenbau GmbH Spüleinrichtung für ein metallurgisches Gefäss
EP0403466A3 (de) * 1989-06-13 1991-12-18 VOEST-ALPINE Industrieanlagenbau GmbH Spüleinrichtung für ein metallurgisches Gefäss

Also Published As

Publication number Publication date
ATE10509T1 (de) 1984-12-15
JPS6157885B2 (de) 1986-12-09
JPS57181319A (en) 1982-11-08
EP0064449A1 (de) 1982-11-10
FR2504664A1 (fr) 1982-10-29
FR2504664B1 (de) 1983-06-03
US4413815A (en) 1983-11-08
DE3261349D1 (en) 1985-01-10

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