EP0086694A1 - Aufblasbare Injektionslanze für einen metallurgischen Konverter - Google Patents

Aufblasbare Injektionslanze für einen metallurgischen Konverter Download PDF

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Publication number
EP0086694A1
EP0086694A1 EP83400234A EP83400234A EP0086694A1 EP 0086694 A1 EP0086694 A1 EP 0086694A1 EP 83400234 A EP83400234 A EP 83400234A EP 83400234 A EP83400234 A EP 83400234A EP 0086694 A1 EP0086694 A1 EP 0086694A1
Authority
EP
European Patent Office
Prior art keywords
lance
orifices
tube
flow
chamber
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.)
Granted
Application number
EP83400234A
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English (en)
French (fr)
Other versions
EP0086694B1 (de
Inventor
Hugues Zanetta
Daniel Richard
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
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 Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT83400234T priority Critical patent/ATE27003T1/de
Publication of EP0086694A1 publication Critical patent/EP0086694A1/de
Application granted granted Critical
Publication of EP0086694B1 publication Critical patent/EP0086694B1/de
Expired legal-status Critical Current

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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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • 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
    • 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
    • C21C5/305—Afterburning

Definitions

  • the present invention relates to a gas injection lance specially designed for metallurgical converters with oxygen blowing from above, by the fact that it makes it possible to produce two concentric gas flows under different generating pressures.
  • Lances are commonly used in metallurgical converters which make it possible to inject oxygen onto the surface of a liquid metal to be refined, such as cast iron or steel. It is known that it is often advantageous, in this kind of operation, to complete the refining reaction of the molten metal by a secondary combustion of the gases which are released from the metal bath, this secondary combustion requiring a pressure which generates oxygen. lower and an annular distribution of the injection around the, or, more generally, the central primary jets with strong impulse ensuring the conversion of the bath. So-called "double flow" lances are used for this, supplied by two separate oxygen circuits at different generating pressures from outside the converter. But we know that it is not always easy to implement such lances with double flow, with two separate feeds and difficulties may arise with regard to the individual controls of each flow.
  • the present invention makes it possible to avoid these drawbacks thanks to a lance - specially designed to produce the two different generating pressures from a single feed stream of the lance.
  • the lance according to the invention also has the advantage of being able to be easily mounted on existing installations using single-flow lances, often even by replacing only the nose of the lance, that is to say the extreme part. the closest, to the liquid metal bath and from which the gas flows come out.
  • the lance according to the invention is characterized in that it essentially comprises an internal chamber for admitting a main gas flow to a first series of blowing orifices, and inside said chamber, means for forming of a secondary gas flow by taking a fraction of the main flow, then setting the sonic flow speed followed by expansion of this fraction and means of supplying this secondary flow to a second series of orifices of blowing, in annular arrangement around the first series.
  • the means for forming the secondary flow can advantageously consist of necks with a sonic flow speed. open in the inlet chamber of the main flow, each at the entrance to an individual expansion tank supplying the injection ports of the second series.
  • This solution where the secondary flow is sampled separately for each of the individual orifices to which it is supplied is most often preferable.
  • a common collector distributing the secondary flow thus withdrawn and expanded towards the various injection orifices, or outlet orifices.
  • the lance according to the invention is particularly suitable for being mounted on a metallurgical converter with top-refining oxygen blowing (type LD), so as to allow the injection of oxygen in the direction of the surface of a metal bath during refining.
  • the lance can then include all of the ancillary equipment known in this type of application, for example means for cooling by circulation of water in a jacket surrounding the wall of the inlet chamber of the main gas flow.
  • the secondary blowing orifices are advantageously oriented, as in conventional double-flow lances, at an inclination, relative to the axis, greater than for the main flow injection orifices. This arrangement, combined with the reduced speed of the secondary flow, ensures the best secondary combustion in a converter, because this secondary flow occupies a conical annular space which widens and widens around the central cone formed by the main flow.
  • the lance according to the invention comprises means for adjusting the sampling of secondary flow in the internal chamber of the lance which may advantageously be constituted by means of adjusting the pass section of the necks through which this sampling is carried out at sonic flow speed.
  • the more or less great restriction of the passage section has an effect on the quantity of gas withdrawn and therefore on the generating oression obtained, after the expansion waves, at the outlet orifices of the series corresponding to the secondary flow.
  • the adjustment can be made by the end of the lance opposite that of the nose which has the outlet orifices.
  • Any device known per se can be used to modify the internal section of the necks according to the needs of this adjustment.
  • the section of the necks is chosen to be strictly less than the section of the outlet openings of the secondary flow, which is sufficient to ensure a sonic speed of the flow in the necks under the pressure conditions usually prevailing in the internal chamber. of the lance (the pressure there always being greater than 10 bars, while the lower pressure limit not to be exceeded is close to 2 bars).
  • FIG 1 there is shown a converter 1 containing a liquid metal 2 being refined.
  • the refining reaction is carried out by blowing oxygen onto the surface of the metal.
  • the converter is equipped for this with a lance 3, arranged vertically in the axis of the converter.
  • the lance 3 is essentially constituted by a tubular wall 4, closed at the lower end by a nose through which are pierced the blowing orifices designated under the general reference 6.
  • FIG. 1 therefore shows the two coaxial walls E and 9 which surround the lance, as well as connections 10 and 11 for the inlet and outlet of the cooling water respectively.
  • Figures 1 and 5 show how are distributed and arranged the orifices 6 through which the oxygen brought under pressure into the lance leaves at the lower end thereof.
  • Figure 2 shows more precisely how these holes are made. It is in fact blowing pipes (12, 13) open at their two ends and passing through the wall of the lance and its double jacket of water circulation. They are divided into two concentric series or crowns. All are inclined with respect to the axis of the lance, deviating from this axis from the inside towards the outside of the lance.
  • a primary blowing cone 14, or main in the axis of the lance is formed in operation, at the outlet of the orifices 47 of the pipes 12 of the internal series, while the pipes 13 of the series external ensure, through their orifices 48, a secondary oxygen blowing 15 which widens annularly around the main cone 14.
  • the nose of the lance is produced as shown in FIG. 2. It shows an internal chamber 16 delimited by the tubular wall 4, which is completed by an end piece 17 which constitutes its bottom.
  • the seal between the wall 4 itself and the bottom 17 is produced by a fitting assembly with interposition of seals 18 to compensate for the effects of differential expansion with the rest of the lance body.
  • two coaxial skirts 20 and 21 which are connected to the tubular casings 8 and 9 respectively of the double cooling jacket.
  • the external skirt 21 is welded to the end of the external envelope 9.
  • the intermediate skirt 20 fits freely in the end of the envelope 8, intermediate between the wall 4 and the outer casing 9. Its bottom 23 only consists of radial lugs which pass around the tubes 12 and 13 and leave an opening 24 in the axis of the lance. The circulation of the cooling water is thus ensured as illustrated by the arrows in FIG. 2, the water descending along the tubular wall 4 and rising in the annular space between the intermediate casing 8 and the outer casing 9.
  • the tubes of the internal crown are of diameter wider than the tubes of the outer ring and that they are slightly conical, while the tubes of the outer ring are cylindrical.
  • these details which are advantageous in the particular case represented, are in general by no means imperative.
  • expansion pots 26 In the internal chamber 16 receiving the oxygen under pressure are arranged expansion pots 26, in a number equal to that of the blowing tubes 13 of the outer ring.
  • Each pot 26 forms an elongated vertical cylindrical enclosure which conducts oxygen taken from the chamber 16 individually to one of the outlet orifices 48 of the blowing pipes 13 of the external crown. Its lower end is connected to a bent extension 28 of the corresponding pipes 13, inside the chamber 16. In the particular case shown, this end consists of an end piece 27 welded to the pot 26 and screwed onto a socket 30 it - even welded to the end of the extension 28.
  • the internal section of the pipes 13 is smaller than that of the pots 26, which leads to having the connector ends 27 with a profile converging in the direction of blowing for setting gas velocity in the pipes 13.
  • the pot 26 opens in the chamber 16 by a neck of reduced section 29.
  • This neck is formed with a converging entry in a nozzle 31 attached to the end of the cylindrical chamber of the pot 26. Its section is lower than that of the corresponding outlet orifice 48.
  • the expansion pot can add to the expansion pot an adjustment system making it possible to vary the passage section of the necks 29, and therefore to adjust the gas flow they take, which leads to change the pressure generating the secondary flow at the outlet of the expansion pots.
  • FIG. 3 illustrates a possibility of making such a system.
  • a blowing tube 13 with its internal extension 28, the corresponding cylindrical expansion pot 26, terminated by the neck 29.
  • the passage section of the neck 29 can be partially closed off with a needle 33 which can be moved above this neck, parallel to its axis .
  • the displacement of the needle 33 is ensured by a jack 34 mounted on a support 35 fixed on the upper end of the pot 26. It was assumed here that the jack was hydraulically or pneumatically operated (using of a fluid, such as water or a compressed gas inert with respect to oxygen), provided from outside the lance.
  • a fluid such as water or a compressed gas inert with respect to oxygen
  • An inlet pipe 36 and a return pipe 37 for this fluid are arranged vertically in the axis of the lance and connected respectively to two O-ring collectors 38 and 39, common to the different expansion pots and which are connected by flexible pipes various cylinders.
  • the conduit 7 which supplies oxygen to the upper end of the lance (FIG. 1), has a vertical passage 40, in the axis of the lance, provided with sealing means not shown.
  • FIG. 4 illustrates another embodiment of a lance according to the invention, which differs from that of FIG. 3 by the means which make it possible to adjust the cross-section for the passage of the necks at the entry into each trigger pot 26.
  • the neck itself is defined by a flexible deformable membrane 42, mounted in leaktight manner between the upper end of the pot 26 and a rigid annular ring 43.
  • An annular chamber 44 is formed around the flexible membrane 42 by an enclosure 45 fixed in a sealed manner, on the one hand on the upper end of the pot 26, on the other hand on the ring 43.
  • a pipe 46 makes it possible to admit into this chamber a control fluid under an adjustable pressure from the outside of the spear. According to this pressure, the membrane 42 is more or less deformed and swollen towards the axis of the neck where the oxygen circulates, which gives the latter a more or less narrowed passage section.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP83400234A 1982-02-10 1983-02-04 Aufblasbare Injektionslanze für einen metallurgischen Konverter Expired EP0086694B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400234T ATE27003T1 (de) 1982-02-10 1983-02-04 Aufblasbare injektionslanze fuer einen metallurgischen konverter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8202173A FR2521167B1 (fr) 1982-02-10 1982-02-10 Lance d'injection de gaz pour convertisseur metallurgique
FR8202173 1982-02-10

Publications (2)

Publication Number Publication Date
EP0086694A1 true EP0086694A1 (de) 1983-08-24
EP0086694B1 EP0086694B1 (de) 1987-05-06

Family

ID=9270861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400234A Expired EP0086694B1 (de) 1982-02-10 1983-02-04 Aufblasbare Injektionslanze für einen metallurgischen Konverter

Country Status (9)

Country Link
US (1) US4432534A (de)
EP (1) EP0086694B1 (de)
JP (1) JPS58147510A (de)
AT (1) ATE27003T1 (de)
BR (1) BR8300661A (de)
CA (1) CA1194302A (de)
DE (1) DE3371367D1 (de)
ES (1) ES8401138A1 (de)
FR (1) FR2521167B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195897A2 (de) * 1985-03-19 1986-10-01 Klöckner Cra Patent Gmbh Wassergekühlte Blaslanze zum Aufblasen von Sauerstoff auf eine Metallschmelze
EP0234389A2 (de) * 1986-02-28 1987-09-02 Arbed S.A. Düse für Frischlanzen
KR101290639B1 (ko) * 2005-11-10 2013-07-30 타타 스틸 리미티드 엘디 제강을 위한 개량된 랜스

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4902484A (en) * 1985-07-18 1990-02-20 John Zink Company Oxygen injector means for secondary reformer
US5297390A (en) * 1992-11-10 1994-03-29 Solar Turbines Incorporated Fuel injection nozzle having tip cooling
US5377960A (en) * 1993-03-01 1995-01-03 Berry Metal Company Oxygen/carbon blowing lance assembly
US5370309A (en) * 1993-05-19 1994-12-06 A. H. Tallman Bronze Company Limited Liquid cooled nozzle
BE1009743A3 (fr) * 1995-06-23 1997-07-01 Thomas Jacques Tuyere de soufflage a oxygene siderurgique.
US6217824B1 (en) 1999-05-20 2001-04-17 Berry Metal Company Combined forged and cast lance tip assembly
FR2797738A1 (fr) * 1999-08-18 2001-02-23 Air Liquide Procede d'injection d'un gaz supersonique dans un four a arc electrique et four a arc pour la mise en oeuvre de ce procede
BE1013686A3 (fr) * 2000-09-15 2002-06-04 Thomas Jacques Nez de lance de soufflage.
WO2007123986A2 (en) * 2006-04-21 2007-11-01 Berry Metal Company Metal making lance tip assembly
AT506984B1 (de) * 2008-06-17 2010-06-15 Siemens Vai Metals Tech Gmbh Sauerstoffblaslanze mit schutzelement
BE1023609B1 (fr) 2016-04-15 2017-05-16 Soudobeam Sa Nez de lance de soufflage
BE1023582B1 (fr) 2016-04-15 2017-05-09 Soudobeam Sa Nez de lance de soufflage
WO2017178608A1 (fr) 2016-04-15 2017-10-19 Soudobeam Sa Nez de lance de soufflage
CN114196798B (zh) * 2021-11-23 2023-03-28 武汉钢铁有限公司 单流道二次燃烧氧枪及其使用方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE845643C (de) * 1949-09-21 1952-08-04 Oesterr Alpine Montan Vorrichtung und Verfahren zum Blasen von Gasen gegen die Oberflaeche von Metallschmelzen
FR1346214A (fr) * 1963-02-02 1963-12-13 Demag Ag Lance pour souffler de l'oxygène notamment dans les fours à affiner l'acier ou lesconvertisseurs
US3411716A (en) * 1966-05-11 1968-11-19 United States Steel Corp Oxygen lance for steelmaking furnaces
DE1408783A1 (de) * 1960-09-12 1969-02-06 Arbed Verfahren und Vorrichtung zum Oberwindblasen in ein Metallbad
FR2104366A5 (de) * 1970-08-17 1972-04-14 Messer Griesheim Gmbh
EP0055956A1 (de) * 1980-12-22 1982-07-14 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Lanze zum Einblasen eines oxydierenden Gases, speziell von Sauerstoff, zur Behandlung von Metallschmelzen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141763A (en) * 1961-08-29 1964-07-21 Italsider Spa Process and device for the intensive use of oxygen in open-hearth furnaces for producing steel
BE648779A (de) * 1963-10-23 1964-10-01
GB1446612A (en) * 1973-03-09 1976-08-18 British Steel Corp Oxygen lances
LU78906A1 (fr) * 1978-01-19 1979-09-06 Arbed Procede et dispositif pour l'affinage d'un bain de metal
SU840119A1 (ru) * 1979-09-25 1981-06-23 Институт черной металлургии Фурма доменной печи

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE845643C (de) * 1949-09-21 1952-08-04 Oesterr Alpine Montan Vorrichtung und Verfahren zum Blasen von Gasen gegen die Oberflaeche von Metallschmelzen
DE1408783A1 (de) * 1960-09-12 1969-02-06 Arbed Verfahren und Vorrichtung zum Oberwindblasen in ein Metallbad
FR1346214A (fr) * 1963-02-02 1963-12-13 Demag Ag Lance pour souffler de l'oxygène notamment dans les fours à affiner l'acier ou lesconvertisseurs
US3411716A (en) * 1966-05-11 1968-11-19 United States Steel Corp Oxygen lance for steelmaking furnaces
FR2104366A5 (de) * 1970-08-17 1972-04-14 Messer Griesheim Gmbh
EP0055956A1 (de) * 1980-12-22 1982-07-14 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Lanze zum Einblasen eines oxydierenden Gases, speziell von Sauerstoff, zur Behandlung von Metallschmelzen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195897A2 (de) * 1985-03-19 1986-10-01 Klöckner Cra Patent Gmbh Wassergekühlte Blaslanze zum Aufblasen von Sauerstoff auf eine Metallschmelze
EP0195897A3 (en) * 1985-03-19 1987-05-27 Klockner Cra Technologie Gmbh Water-cooled lance for blowing oxygen onto a metal bath
EP0234389A2 (de) * 1986-02-28 1987-09-02 Arbed S.A. Düse für Frischlanzen
EP0234389A3 (en) * 1986-02-28 1989-03-15 Arbed S.A. Tuyere for refining lances
KR101290639B1 (ko) * 2005-11-10 2013-07-30 타타 스틸 리미티드 엘디 제강을 위한 개량된 랜스

Also Published As

Publication number Publication date
US4432534A (en) 1984-02-21
FR2521167A1 (fr) 1983-08-12
JPS58147510A (ja) 1983-09-02
BR8300661A (pt) 1983-11-08
ES519658A0 (es) 1983-12-01
EP0086694B1 (de) 1987-05-06
JPH0249368B2 (de) 1990-10-30
ES8401138A1 (es) 1983-12-01
ATE27003T1 (de) 1987-05-15
DE3371367D1 (en) 1987-06-11
CA1194302A (fr) 1985-10-01
FR2521167B1 (fr) 1987-04-30

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