EP0336109A1 - Düse für Frischlanzen - Google Patents

Düse für Frischlanzen Download PDF

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Publication number
EP0336109A1
EP0336109A1 EP89103569A EP89103569A EP0336109A1 EP 0336109 A1 EP0336109 A1 EP 0336109A1 EP 89103569 A EP89103569 A EP 89103569A EP 89103569 A EP89103569 A EP 89103569A EP 0336109 A1 EP0336109 A1 EP 0336109A1
Authority
EP
European Patent Office
Prior art keywords
nozzle according
lance
mouth
sharp edges
oxygen
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
EP89103569A
Other languages
English (en)
French (fr)
Other versions
EP0336109B1 (de
Inventor
Romain Henrion
Henri Klein
François Knaff
Robert Mousel
Michel Decker
Carlo Heintz
Carlo Lux
Patrick Derungs
Henri Hoerold
André Bock
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.)
Paul Wurth SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Priority to AT89103569T priority Critical patent/ATE79412T1/de
Publication of EP0336109A1 publication Critical patent/EP0336109A1/de
Application granted granted Critical
Publication of EP0336109B1 publication Critical patent/EP0336109B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21C5/42—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 nozzle for a refining lance and in particular a nozzle for supplying post-combustion oxygen to the space situated above a metal bath in the process of refining.
  • Refining lances which have, apart from the vertical nozzles supplying the supersonic oxygen for refining, several auxiliary nozzles, inclined between 25 ° and 60 ° (see for example the patents LU 78 906 and LU 83 814) by relative to the vertical axis, delivering oxygen jets used for post-combustion. Since these oxygen jets are subsonic, the auxiliary nozzles are supplied by an independent oxygen circuit which allows flow regulation. It is also known (see patent LU 82 846) to provide the conduits of the nozzles which guide the afterburner oxygen, with means for increasing the degree of turbulence of the jet.
  • These means may consist of sheets placed in the conduits of the secondary nozzles so as to form spirals; in another embodiment, the walls of the conduits are provided with grooves which can be either circular and arranged in a plane perpendicular to the axis of the conduit, or spiral.
  • the angles of inclination of the afterburning oxygen jets are imposed by those of the nozzles; once determined by empirical tests or methods (taking into account the inclinations of the primary oxygen jets, their arrangement, the dimensions of the converter, the height of the lance head above the bath, etc.), these angles remain constant.
  • These nozzles do not allow to sweep the space above the bath with jets of oxygen, nor send the post-combustion oxygen into the converter at an angle depending on the refining phase in progress.
  • Patent LU 86 329 describes a supersonic nozzle supplying post-combustion oxygen under variable inclination to the space above a metal bath. It has a wall along which the gas flows in a straight line before reaching a sharp edge, constituting a part of the mouth. It is at the height of the summit of this pointed edge that the jet relaxes and is deflected.
  • the deflection angle varies as a function of the gas pressure at the edge, i.e. the higher the gas pressure, the greater the deflection angle; on the other hand the deflection effect by the edge is practically zero when the gas has a subsonic speed there.
  • the object of the present invention is to propose a nozzle which makes it possible to create a practically homogeneous layer of oxygen above the metal bath of the converter.
  • a pressure sensor (not shown) measures the actual pressure P at the inlet of one of the nozzles. This pressure P is compared to a set pressure Po and in the event of a difference a regulation loop acts on the degree of opening of the valve.
  • the pressure Po is determined by routine tests so as to have a deflection such that the space around the mouth is uniformly supplied with oxygen.
  • a nozzle 3 When a nozzle 3 is fed under a pressure which increases from zero pressure, the gas jet exits at an increasing speed. From a limit pressure, depending on the construction details of the nozzle, the speed of the gas at the outlet becomes sonic. Additional increases in the supply pressure no longer act on the speed of the gas at the outlet which remains sonic, but increase its internal pressure.
  • the jet relaxes while being the seat of a multitude of shock waves which are at the basis of an increase in jet speed and its bilateral deflection.
  • the deflection angle varies depending on the gas pressure at the mouth, i.e.
  • the afterburner nozzles have an inclination of a few tens of degrees relative to the vertical axis and that, at the limit, they are arranged in a circle surrounding the refining nozzles, on the in front of the spear.
  • the oxygen layer instead of being horizontal as in the case of fig. 1, will be inclined towards the surface of the metal bath by sketching a shape comparable to that of an open three-quarter umbrella.
  • all the carbon monoxide leaving the bath must pass through the bound layer of oxygen before reaching the chimney.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Nozzles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
EP89103569A 1988-03-11 1989-03-01 Düse für Frischlanzen Expired - Lifetime EP0336109B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89103569T ATE79412T1 (de) 1988-03-11 1989-03-01 Duese fuer frischlanzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87156 1988-03-11
LU87156A LU87156A1 (fr) 1988-03-11 1988-03-11 Tuyere pour lance d'affinage

Publications (2)

Publication Number Publication Date
EP0336109A1 true EP0336109A1 (de) 1989-10-11
EP0336109B1 EP0336109B1 (de) 1992-08-12

Family

ID=19731031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103569A Expired - Lifetime EP0336109B1 (de) 1988-03-11 1989-03-01 Düse für Frischlanzen

Country Status (10)

Country Link
US (1) US4971297A (de)
EP (1) EP0336109B1 (de)
JP (1) JP2641287B2 (de)
AT (1) ATE79412T1 (de)
AU (1) AU611777B2 (de)
BR (1) BR8901017A (de)
CA (1) CA1330874C (de)
DE (1) DE68902411T2 (de)
ES (1) ES2034433T3 (de)
LU (1) LU87156A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865876A (en) * 1995-06-07 1999-02-02 Ltv Steel Company, Inc. Multipurpose lance
US5681526A (en) * 1996-04-23 1997-10-28 Usx Corporation Method and apparatus for post-combustion of gases during the refining of molten metal
US5830259A (en) * 1996-06-25 1998-11-03 Ltv Steel Company, Inc. Preventing skull accumulation on a steelmaking lance
US5885323A (en) * 1997-04-25 1999-03-23 Ltv Steel Company, Inc. Foamy slag process using multi-circuit lance
WO2022074430A1 (en) * 2020-10-06 2022-04-14 Arcelormittal Post combustion lance

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488044A (en) * 1967-05-01 1970-01-06 Nat Steel Corp Apparatus for refining metal
LU78906A1 (fr) * 1978-01-19 1979-09-06 Arbed Procede et dispositif pour l'affinage d'un bain de metal
GB2085562A (en) * 1980-10-13 1982-04-28 Arbed Oxygen lance for iron refining
EP0081448B1 (de) * 1981-12-04 1986-09-10 Arbed S.A. Verfahren und Vorrichtung zum Raffinieren eines Metallbades, das feste Kühlmittel enthält
EP0234389A2 (de) * 1986-02-28 1987-09-02 Arbed S.A. Düse für Frischlanzen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015481A (en) * 1959-12-11 1962-01-02 Archie H Clingensmith Tuyere assembly
US3627294A (en) * 1970-03-25 1971-12-14 Atlantic Richfield Co Protection sleeve for dip tubes
CA941159A (en) * 1971-01-27 1974-02-05 Boris S. Yarovsky Chaikin Oxygen tuyere of a steel-melting mill
US3972517A (en) * 1974-08-05 1976-08-03 Fedor Vladimirovich Kraizinger Tuyere for introducing reactants into a bath of molten metal
NL8104474A (nl) * 1981-10-01 1983-05-02 Estel Hoogovens Bv Vloeistofgekoelde lans voor het blazen van zuurstof op een staalbad.
CA1293121C (en) * 1985-08-20 1991-12-17 Nobuyoshi Takashiba Lance for blow-refinement in converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488044A (en) * 1967-05-01 1970-01-06 Nat Steel Corp Apparatus for refining metal
LU78906A1 (fr) * 1978-01-19 1979-09-06 Arbed Procede et dispositif pour l'affinage d'un bain de metal
GB2085562A (en) * 1980-10-13 1982-04-28 Arbed Oxygen lance for iron refining
EP0081448B1 (de) * 1981-12-04 1986-09-10 Arbed S.A. Verfahren und Vorrichtung zum Raffinieren eines Metallbades, das feste Kühlmittel enthält
EP0234389A2 (de) * 1986-02-28 1987-09-02 Arbed S.A. Düse für Frischlanzen

Also Published As

Publication number Publication date
BR8901017A (pt) 1989-10-24
EP0336109B1 (de) 1992-08-12
ES2034433T3 (es) 1993-04-01
US4971297A (en) 1990-11-20
JPH01275713A (ja) 1989-11-06
CA1330874C (en) 1994-07-26
ATE79412T1 (de) 1992-08-15
DE68902411D1 (de) 1992-09-17
AU611777B2 (en) 1991-06-20
AU3116089A (en) 1989-09-14
DE68902411T2 (de) 1992-12-10
JP2641287B2 (ja) 1997-08-13
LU87156A1 (fr) 1989-10-26

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