EP0364721B1 - Lanze zum Blasfrischen - Google Patents

Lanze zum Blasfrischen Download PDF

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Publication number
EP0364721B1
EP0364721B1 EP89116607A EP89116607A EP0364721B1 EP 0364721 B1 EP0364721 B1 EP 0364721B1 EP 89116607 A EP89116607 A EP 89116607A EP 89116607 A EP89116607 A EP 89116607A EP 0364721 B1 EP0364721 B1 EP 0364721B1
Authority
EP
European Patent Office
Prior art keywords
lance
tuyere
oxygen
mouth
sharp edge
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 - Lifetime
Application number
EP89116607A
Other languages
English (en)
French (fr)
Other versions
EP0364721A1 (de
Inventor
Robert Mousel
Carlo Lux
François Knaff
Henri Klein
Romain Henrion
Carlo Heintz
Michel Decker
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.)
Arcelor Luxembourg 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 AT89116607T priority Critical patent/ATE89321T1/de
Publication of EP0364721A1 publication Critical patent/EP0364721A1/de
Application granted granted Critical
Publication of EP0364721B1 publication Critical patent/EP0364721B1/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
    • C21C5/4606—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 refining lance comprising at least one supersonic nozzle for supplying the refining oxygen to a metal bath, as well as to means for supplying the post-combustion oxygen to the space situated above the bath.
  • Refining lances which have, apart from the main nozzles supplying the supersonic refining oxygen, several auxiliary nozzles, inclined between 25 ° and 60 ° relative to the vertical axis, delivering jets of subsonic oxygen used for afterburning. It is also known (see patent LU 82,846) to provide the conduits of the nozzles which guide the post-combustion oxygen, with means for increasing the degree of turbulence of the jet. These means may consist of sheets placed in the conduits of the nozzles; it is also possible to provide the walls of the conduits with grooves.
  • angles of inclination of the afterburning oxygen jets are however 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. Consequently, these nozzles do not allow either to sweep the space above the bath with jets of oxygen, nor to send the post-combustion oxygen into the converter at an appropriate angle, depending on the refining phase in Classes.
  • Patent LU 86,329 describes a supersonic nozzle supplying post-combustion oxygen under variable inclination to the space above of a metal bath. It has a wall along which the gas flows in a straight line before reaching a sharp edge, constituting 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 angle of deflection; 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 continuous layer of oxygen, completely surrounding the jet of refining oxygen.
  • a pressure sensor (not shown) measures the actual pressure P at the outlet of the control valve. 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 set pressures Po vary as a function of the refining phase and are chosen so that the space is supplied with oxygen by means of a jet having the required flow rate and opening angle.
  • All around the annular nozzle 6 supplying the afterburning oxygen are the walls which guide the cooling fluid (usually water). These walls are essentially constituted by three concentric tubes 4, 7 and 8, the tube 4 guiding by its inner face also the oxygen used for post-combustion. The spacing between the concentric walls 5, 4 and 7, 8 is maintained using the spacers 10 and 9 respectively. These spacers, half a dozen in number per conduit, are preferably elongated flat sheets, so as to also assume a function of guiding the fluids necessary for an even distribution of the fluids in the annular conduits.
  • the lance head essentially comprises a central tube 5 which, in the case of the drawing, has a pear shape as explained in connection with patent application LU 86.321, and several concentric tubes 4, 7, 8 which define annular spaces guiding a gas and a liquid. Since the liquid layer is continuous and in particular does not meet any oxygen-supplying nozzles, which are the source of turbulence, the cooling of the external cap is done under optimal conditions.
  • the outlet angle of the elbow which is approximately 20 ° relative to the axis of the lance in the case of the figure- defines the angle of deflection of the gas jet in subsonic regime.
  • the front face of the head, near the edge 25 is slightly offset towards the inside of the lance head. This offset allows a more pronounced deviation of the supersonic jet by the edge 21.
  • the bent surface is extended as far as the front face of the head, it will be necessary to avoid bringing the edge 25 too close to the inclined wall 23 so as not to move the position of the cervix, c. to d. the point of the nozzle where the section is smallest, at this level.
  • the gas jet exits at an angle defined by the bent wall, ie. at an angle of 20 ° in this case. From a limit pressure, the speed of the gas at the outlet becomes sonic. Additional increases in the supply pressure no longer act on the Mach number at the outlet which remains equal to 1, but increase its internal pressure.
  • the jet relaxes while being the seat of a multitude of Mach lines, which are the basis of an increase in the speed of the jet and its deflection.
  • the deflection angle varies as a function of the gas pressure at the edge 21, i.e. the higher the gas pressure, the greater the deflection and the quantity of gas deflected.
  • the deflection of the jet by the edge 25 at which the internal pressure has already dropped significantly, is weak, that caused by the edge 22 is most reduced.
  • the oxygen layer is tilted towards the surface of the metal bath, sketching a shape comparable to that of an open three-quarter umbrella. A large part of the carbon monoxide leaving the bath must pass through the continuous layer of oxygen before reaching the chimney. Depending on the operating mode (Mach number), the oxygen layer is more or less thick.

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  • 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)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (6)

  1. Lanze zum Blasfrischen welche sich zusammensetzt aus wenigstens einer primären Düse zum Beaufschlagen eines metallischen Bades mit Frischsauerstoff, sowie aus Mitteln zum Einspeisen von Sauerstoff für die Nachverbrennung in den über dem Metallbad befindlichen Raum, wobei diese Mittel in der Verlängerung einer Zufuhrleitung für das Gas liegen, welche besagte Mittel über einen den Druck regelnden Schieber mit einer Sauerstoffquelle verbinden und welche neben einer Mündung mit einem stromaufwärts angeordneten konvergierenden Teil gegebenenfalls auch einen Hals aufweisen, dadurch gekennzeichnet, dass diese Mündung (3) auf der vorderen Front des Lanzenkopfes konzentrisch um die Austrittsöffnung (2) der primären Düse herum angeordnet ist und dass sie aus zwei entgegengesetzten Seiten besteht, eine äussere Seite und eine innere Seite, deren Verlauf im wesentlichen kreisförmig ist und dass die äussere Seite wenigstens einen scharfen Grat (21) aufweist, welcher in der Verlängerung des konvergierenden Teiles (20) liegt.
  2. Düse gemäss Anspruch 1, dadurch gekennzeichnet, dass der konvergierende Teil aus zwei konzentrischen rohrförmigen Wänden (4,5) besteht.
  3. Düse gemäss Anspruch 1, dadurch gekennzeichnet, dass der Hals auf eine Fläche begrenzt ist welche durch den besagten Grat (21) hindurch verläuft.
  4. Düse gemäss Anspruch 1, dadurch gekennzeichnet, dass die dem besagten scharfen Grat (21) entgegengesetzte Seite den Verlauf eines Bogens (24) andeutet der in einer Spitze (25) endet und dass eine durch diese Spitze (25) verlaufende Tangente zum Bogen (24) mit der Achse der Lanze einen zwischen 0° und 40° liegenden Winkel bildet.
  5. Düse gemäss Anspruch 4, dadurch gekennzeichnet, dass die Spitze (25) gegenüber der vorderen Front des Kopfes der Lanze um einige Millimeter nach hinten (26) versetzt ist.
  6. Düse nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der scharfe Grat (21) mit der vorderen Front des Lanzenkopfes durch eine schräge Wand (23) verbunden ist, wobei letztere mit der Achse der Lanze einen zwischen 0° und 70° liegenden Winkel bildet.
EP89116607A 1988-09-28 1989-09-08 Lanze zum Blasfrischen Expired - Lifetime EP0364721B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116607T ATE89321T1 (de) 1988-09-28 1989-09-08 Lanze zum blasfrischen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87354 1988-09-28
LU87354A LU87354A1 (fr) 1988-09-28 1988-09-28 Lance d'affinage

Publications (2)

Publication Number Publication Date
EP0364721A1 EP0364721A1 (de) 1990-04-25
EP0364721B1 true EP0364721B1 (de) 1993-05-12

Family

ID=19731099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116607A Expired - Lifetime EP0364721B1 (de) 1988-09-28 1989-09-08 Lanze zum Blasfrischen

Country Status (4)

Country Link
EP (1) EP0364721B1 (de)
AT (1) ATE89321T1 (de)
DE (1) DE68906505T2 (de)
LU (1) LU87354A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU87855A1 (fr) * 1990-12-10 1992-08-25 Arbed Lance de soufflage
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU82846A1 (fr) * 1980-10-13 1982-05-10 Arbed Lance de soufflage d'oxygene
FR2496699B1 (fr) * 1980-12-22 1985-06-21 Siderurgie Fse Inst Rech Lance de soufflage de gaz oxydant, notamment d'oxygene, pour le traitement des metaux en fusion
LU86321A1 (fr) * 1986-02-25 1987-09-10 Arbed Lance de soufflage d'oxygene
LU86329A1 (fr) * 1986-02-28 1987-09-10 Arbed Tuyere pour lance d'affinage

Also Published As

Publication number Publication date
DE68906505T2 (de) 1993-10-07
EP0364721A1 (de) 1990-04-25
LU87354A1 (fr) 1990-04-06
ATE89321T1 (de) 1993-05-15
DE68906505D1 (de) 1993-06-17

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