EP0364722B1 - Sauertoff-Blaslanze - Google Patents

Sauertoff-Blaslanze Download PDF

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Publication number
EP0364722B1
EP0364722B1 EP89116608A EP89116608A EP0364722B1 EP 0364722 B1 EP0364722 B1 EP 0364722B1 EP 89116608 A EP89116608 A EP 89116608A EP 89116608 A EP89116608 A EP 89116608A EP 0364722 B1 EP0364722 B1 EP 0364722B1
Authority
EP
European Patent Office
Prior art keywords
lance
nose
gas
throttle body
central throttle
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
EP89116608A
Other languages
English (en)
French (fr)
Other versions
EP0364722A1 (de
Inventor
Robert Moussel
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.)
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 AT89116608T priority Critical patent/ATE89322T1/de
Publication of EP0364722A1 publication Critical patent/EP0364722A1/de
Application granted granted Critical
Publication of EP0364722B1 publication Critical patent/EP0364722B1/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

Definitions

  • the invention relates to a lance for refining metals or ferroalloys contained in a metallurgical vessel by means of a jet of oxygen blown at supersonic speed from above onto the molten bath.
  • the central gas discharge conduit normally comprises a converging part followed by a more or less long cylindrical neck, as well as a diverging part downstream.
  • a central duct is designated by the name of 'Laval nozzle'.
  • the Mach number depends on the pressure of the gas supply source, while the optimal flow rate is itself a function of the inlet pressure at the nozzle and the diameter of the neck of the convergent.
  • the geometrical configuration of the nozzle is decisive for the characteristics of the jet, parameters such as the Mach number and the optimal flow cannot be varied independently of each other. This means that if a lance has been designed to have a high flow rate, you cannot, for example, carry out a hard jet and reduced flow blowing, nor switch to a soft and reduced flow blowing, without 'takes away in one direction or the other the optimal sizes resulting from the geometrical configuration of the nozzle. If one tries to exceed the limits of the flow rate and the speed of exit, it is created inside the metallurgical container and near the mouth of the lance of the shock waves. The consequence is that the characteristics of the jet deteriorate and that the wear of the lance progresses rapidly.
  • Such an oxygen blowing lance which includes a Laval nozzle and which makes it possible to vary the Mach number and the optimal flow rate one independently of the other, has been described in European patent application no. 235,621.
  • the pressure of each of the two gases can be adjusted one independently of the other.
  • the passage section of the primary jet in the nozzle is reduced or enlarged by means of a very tapered needle-shaped tip which is movable along the axis of the nozzle.
  • the object of the present invention is therefore to propose an oxygen blowing lance comprising a Laval nozzle, which, in concert with a central obturation device of specific configuration, makes it easy to reach and to vary the extreme characteristics of an oxygen jet, without resorting to an auxiliary jet peripheral.
  • the creation of turbulence must be avoided or at least minimized, for any mode of operation of this Laval nozzle.
  • the mechanical means used must be of reduced bulk, operate at reduced motive power and include a minimum of moving parts.
  • the main advantage of the new lance concept according to the invention resides in the possibility offered to the metallurgist to be able to easily adapt at each instant of refining the conditions for injecting the oxygen jet according to metallurgical requirements by varying in the desired limits the volume of the ripening oxygen, while at the same time being able to jet the desired speed.
  • the Laval nozzle as illustrated comprises in the direction of gas flow first a converging part 4, then a cylindrical neck 3 and finally a diverging part.
  • the length and the shape of the converging and diverging parts are chosen according to the profile and the position of the nose 6 of the central adjustment body 5 or vice versa. It should be noted that the length of the cylindrical neck 3 can be extremely short and can be reduced to a single plane.
  • the upper part of the central adjustment body 5 is received in a movable manner in the lower end of a cylindrical copper casing 7, as illustrated in FIG. 2.
  • the housing 7 is itself rigidly connected to the oxygen evacuation pipe by means of radial spacers.
  • the adjustment body 5 at the head of the housing 7 is exchangeable, its fixing being preferably carried out by screwing. It can be moved down or up along the axis of the lance under the action of a motive force, which can for example be provided by a linear stepping motor.
  • the adjustment body 5 is connected to a movable rod 8 actuated by the positioning cylinder 13 secured to a motor.
  • the engine is actuated according to instructions received from an electronic control device, which transforms entry dates, such as for example the actual gas flow rate, the desired gas flow rate and the momentary position of the rod 8, to deduce the new required position of the rod 8.
  • the cavity 9 Upstream of the convergent 4 of the Laval nozzle, the cavity 9 is made tight vis-à-vis the flow of oxygen by means of O-rings. More downstream, on the other hand, there is communication between the region of the neck 3 and the cavity 9 by virtue of grooves which extend axially from the cavity 9 to the surface of the profiled part of the nose 6 of the central adjustment body 5. With this measure, the driving force for actuating the central adjustment body 5 can be significantly reduced. Indeed, along the profile of the nose 6 there is an underpressure - variable depending on the point considered and according to the operating parameters of the lance - which tends to suck the central adjustment body 5 towards the orifice of the lance . Thanks to the grooves 11, the underpressure prevailing outside is also established inside the cavity.
  • a conventional divergent zone visible in FIG. 1 and constituted by the frustoconical flaring part 2.1 of the central oxygen pipe, extends from the lance nose up to a certain distance upstream and controls the expansion of the oxygen jet in the usual manner.
  • the new divergent zone is formed by the profiled part of the nose 6 of the central adjustment body 5 which causes the expansion of the gas and it is delimited externally by the peripheral tube 2.2, which preferably has a shape cylindrical.
  • this tube has no major influence on the dynamics of gas expansion.
  • the geometric shape of the tip of the nose 6 of the central adjustment body 5 it is linked to that of the converging part 4 or vice versa.
  • the shape is determined either by calculations or by empirical tests, so that the turbulence remains minimized and the gas is gradually accelerated. It appears that with suitable profiling of the nose 6 of the central adjustment body 5, for example that illustrated in FIG. 1, the predominant part of the expansion of the gas takes place along this part. It follows that the conventional divergent zone 2.1 loses most of its importance and that, at the limit, it can be envisaged for its elimination.
  • the neck 3 according to the invention is constituted by an outer guide wall of cylindrical shape with constant section - just as it is used in conventional nozzles - and in addition by an inner guide wall of cylindrical shape formed by the wall lateral of the central adjustment body 5.
  • the extension of this neck depends on the position of the central adjustment body 5 and it can be reduced in the limiting case to a simple plane separating the converging part from the diverging part.
  • the convergent 4 is delimited by an internal cylindrical surface, formed by the side wall of the central adjustment body 5 and by an external convergent profile 4.1, constituted by the internal wall of the nozzle.
  • the configuration of the converging zone is a little less critical than that of the new divergent profile determined by the contour of the nose 6 of the central adjustment body 5 and one could go so far as to give it a simple conical shape. Nevertheless, the fact remains that the advantages of the invention are optimally obtained if the wall 4.1 is profiled and if this profile is complementary to that of the pointed part of the nose 6 central adjustment body 5.
  • the intersection of the profiled part of the nose 6 of the central adjustment body 5 with a plane containing the axis of the nozzle has parabolic parts which delimit the pointed end of the profile of the nose 6 and which are connected to the central adjustment body 5 by substantially circular traces.
  • the purpose of this configuration is to eliminate as far as possible the discontinuities likely to create disturbances.
  • a given pressure is chosen for the gas source - by positioning the valve in the evacuation circuit - and the gas flow is varied by modifying the position of the nose 6 of the central adjustment body 5.
  • the gas flow rate is effectively varied for a given Mach number without causing the jet to burst.
  • the softest possible gas jet is obtained by choosing a low pressure for the gas source and by advancing the central adjustment body 5 as much as possible, so as to minimize the effective section left free in the duct of 'oxygen.
  • the other limiting condition consists in an extremely hard jet, which is obtained if the pressure of the gas source is high and if the central adjustment body 5 is retracted to the maximum, that is to say that the effective free section in the neck of the main duct is as large as possible.
  • Laval nozzle lances have been designed either for a hard jet or for a soft jet, they are completely unsuitable for refining phases requiring blowing conditions other than those for which the lances have been built. Indeed, a lance designed to provide a soft jet does not make it possible to substantially increase the acceleration of the gas, while with a lance constructed to obtain a hard jet the quantities of gas ejected cannot be increased at will. In both cases the increase in the pressure at the source of the gas results in the formation of shock waves, which impede the acceleration of the gas and limit its flow.

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)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Gas Separation By Absorption (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Treating Waste Gases (AREA)

Claims (8)

  1. Sauerstoff-Blaslanze welche dazu dient ein flüssiges in einem metallurgischen Gefäss enthaltenes Bad eines Metalles oder einer Ferrolegierung zu frischen und welche am unteren Ende ausgerüstet ist einerseits mit einer unterschiedliche Querschnitte aufweisenden Laval-Düse, wobei die Querschnitte, in der Abflussrichtung des Gases gesehen, einer konvergierenden Zone (4), einem daran anschliessenden Hals (3) und, in der Nähe der Nase der Lanze, einer divergierenden Zone entsprechen, und andrerseits mit einem zentralen Regelkörper (5), welcher in dem Bereich des Halses (3) entlang der Achse der Düse beweglich ist, dadurch gekennzeichnet, dass ein divergierender Bereich begrenzt wird durch eine im wesentlichen zylindrische Wand der inneren für das Gas bestimmten Leitung (1) und durch eine Nase (6) welche sich über den im übrigen zylindrischen zentralen Regelkörper (5) hinaus erstreckt und welche profiliert ist um eine Expansion des Gases zu gewährleisten.
  2. Sauerstoff-Blaslanze gemäss Anspruch 1, dadurch gekennzeichnet, dass der Umriss der Nase (6) auf solche Art und Weise profiliert ist, dass die Kurven, welche durch ihre Durchschneidung mit der durch die Achse des zentralen Regelkörpers (5) hindurchführenden Ebene erhaltenen werden, in ihrem Mittelpunkt einen Inflektionspunkt aufweisen.
  3. Sauerstoff-Blaslanze gemäss einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Aenderung des Querschnittes der Nase (6) entlang der Achse des zentralen Regelkörpers (5) in der zur Achse senkrechten Ebene schwach auf der Seite des zentralen Regelkörpers (5) ist, ausgeprägt gegen die Mitte der Nase (6) und gering an der Spitze der Nase (6) ist.
  4. Sauerstoff-Blaslanze gemäss einem der Ansprüch 1 bis 3, dadurch gekennzeichnet, dass die Durchschneidung der Nase (6) mit einer die Achse des zentralen Regelkörpers (5) enthaltenden Ebene parabolische Teile aufweist welche mit dem zylindrischen Körper durch im wesentlichen kreisförmige Linien verbunden sind.
  5. Sauerstoff-Blaslanze gemäss Anspruch 1, dadurch gekennzeichnet, dass die profilierte Nase (6) des zentralen Regelkörpers (5) auswechselbar ist.
  6. Sauerstoff-Blaslanze gemäss Anspruch 1, dadurch gekennzeichnet, dass der zentrale Regelkörper (5) in einem länglichen, die untere Spitze des besagten Körpers (5) abschliessenden Hohlraum (9) beweglich ist, wobei der Hohlraum (9) auf der Höhe des konvergierenden Teiles 4.1 mittels O-förmigen Ringen (10) auf gasdichte Art und Weise gegenüber dem durch die zentrale Leitung abfliessenden Gasstrom abgetrennt ist.
  7. Sauerstoff-Blaslanze gemäss Anspruch 6, dadurch gekennzeichnet, dass der Hohlraum (9) über Rillen (11) mit dem Gasstrom in Verbindung steht, wobei die Rillen in der Nase (6) des zentralen Regelkörpers (5) vorgesehen sind.
  8. Sauerstoff-Blaslanze gemäss einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Schnittkurven des profilierten Teiles der Nase (6) und des konvergierenden Teiles 4.1 durch eine durch die Achse der Lanze hindurchgehende Ebene wenigstens teilweise die eine von der anderen durch Homothetie abgeleitet werden können.
EP89116608A 1988-09-28 1989-09-08 Sauertoff-Blaslanze Expired - Lifetime EP0364722B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116608T ATE89322T1 (de) 1988-09-28 1989-09-08 Sauertoff-blaslanze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87353 1988-09-28
LU87353A LU87353A1 (fr) 1988-09-28 1988-09-28 Lance de soufflage d'oxygene

Publications (2)

Publication Number Publication Date
EP0364722A1 EP0364722A1 (de) 1990-04-25
EP0364722B1 true EP0364722B1 (de) 1993-05-12

Family

ID=19731098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116608A Expired - Lifetime EP0364722B1 (de) 1988-09-28 1989-09-08 Sauertoff-Blaslanze

Country Status (10)

Country Link
US (1) US4993691A (de)
EP (1) EP0364722B1 (de)
JP (1) JP2786266B2 (de)
AT (1) ATE89322T1 (de)
AU (1) AU615100B2 (de)
BR (1) BR8904939A (de)
CA (1) CA1338688C (de)
DE (1) DE68906507T2 (de)
ES (1) ES2041381T3 (de)
LU (1) LU87353A1 (de)

Families Citing this family (8)

* 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
LU88023A1 (fr) * 1991-10-30 1993-05-17 Arbed Lance de soufflage
USH1624H (en) * 1993-06-02 1997-01-07 The United States Of America As Represented By The Secretary Of The Navy Stabilizer for submerged gaseous jets in liquids
SE511424C2 (sv) * 1993-12-30 1999-09-27 Stiftelsen Metallurg Forsk Ringspaltdysa och sätt att blåsa en metallsmälta
IT1302799B1 (it) * 1998-11-10 2000-09-29 Danieli & C Ohg Sp Ugello per dispositivo di iniezione di ossigeno e gastecnologici e relativo metodo di dimensionamento
AT408437B (de) * 2000-02-22 2001-11-26 Holderbank Financ Glarus Einrichtung zum zerstäuben von flüssigen schmelzen
JP5273125B2 (ja) * 2010-11-04 2013-08-28 新日鐵住金株式会社 溶融金属減圧精錬用ノズル
JP5387619B2 (ja) * 2011-05-24 2014-01-15 新日鐵住金株式会社 溶融金属減圧精錬用ノズルおよび精錬方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT216032B (de) * 1959-02-20 1961-07-10 Arbed Vorrichtung zum Beblasen eines Metallbades von oben
GB995688A (en) * 1963-06-22 1965-06-23 Douglas Norman Manton Improvements in or relating to oxygen lances
NL6710354A (de) * 1966-07-27 1968-01-29
JPS57154755U (de) * 1981-03-24 1982-09-29
LU86322A1 (fr) * 1986-02-25 1987-09-10 Arbed Lance de soufflage d'oxygene
JPS62230928A (ja) * 1986-04-01 1987-10-09 Nippon Kokan Kk <Nkk> 転炉吹錬用ランス

Also Published As

Publication number Publication date
DE68906507D1 (de) 1993-06-17
JP2786266B2 (ja) 1998-08-13
AU4014189A (en) 1990-04-05
JPH02115315A (ja) 1990-04-27
ATE89322T1 (de) 1993-05-15
BR8904939A (pt) 1990-05-08
EP0364722A1 (de) 1990-04-25
CA1338688C (en) 1996-11-05
LU87353A1 (fr) 1990-04-06
DE68906507T2 (de) 1993-10-07
ES2041381T3 (es) 1993-11-16
US4993691A (en) 1991-02-19
AU615100B2 (en) 1991-09-19

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