EP0490101A1 - Blaslanze - Google Patents

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Publication number
EP0490101A1
EP0490101A1 EP91119298A EP91119298A EP0490101A1 EP 0490101 A1 EP0490101 A1 EP 0490101A1 EP 91119298 A EP91119298 A EP 91119298A EP 91119298 A EP91119298 A EP 91119298A EP 0490101 A1 EP0490101 A1 EP 0490101A1
Authority
EP
European Patent Office
Prior art keywords
lance
gas
refining
blowing
head
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.)
Withdrawn
Application number
EP91119298A
Other languages
English (en)
French (fr)
Inventor
Victor Bleser
André Bock
Patrick Derungs
Carlo Heintz
Carlo Lux
Robert Mousel
François Witry
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
Publication of EP0490101A1 publication Critical patent/EP0490101A1/de
Withdrawn legal-status Critical Current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 present invention relates to a blowing lance, in particular a blowing lance for a gas used for refining metals in their liquid state.
  • the design of the blowing lance used in the context of a refining process as described above is complex. Indeed, the oxidizing gas must on the one hand be able to react reciprocally with the metal bath so that the reactions, such as decarburization can take place, and on the other hand be able to ensure above the surface of the bath a post-combustion of the carbon monoxide released. It must also be ensured that the quantities of oxidizing gas injected can be regulated independently of the speed of the gas jet. A displacement of the point of impact of the gas jet on the surface of the bath during the refining process is moreover desirable in order to increase the surface where the metallurgical reactions take place and to intensify its stirring effect in the bath. .
  • the post-combustion oxygen must, moreover, be able to embrace the widest possible reaction zone, while ensuring that the post-combustion of carbon monoxide takes place near the surface of the bath and not in the regions where the energy released would jeopardize the lance itself.
  • the Luxembourg patent No. 86 322 (US 4,730,784, EU 0 235 621) describes an oxygen blowing lance nozzle for refining metals which makes it possible to vary the exit speed (the Mach number) and the flow rate of the jet of oxygen independently of each other.
  • a further development of such a blowing lance which allows the operator to vary, according to the different refining phases, the quantity of oxygen introduced into the bath while imposing on the jet of oxygen the shape and the speed optimal required, is the subject of Luxembourg patent No. 87 353 (US SN 395,104). According to the device of the Luxembourg patent No.
  • the blowing lance has a nozzle for forming and guiding the jet of refining oxygen, comprising a duct with variable section sketching a convergent followed by a neck and a diverging , the nozzle being provided with a central part movable along the axis of the nozzle at the neck.
  • the central part follows a shape having a substantially cylindrical body and a nose which tapers concavely towards a point.
  • blowing lance of the present invention makes use of the device described in Luxembourg patent No. 87 353 which will advantageously be incorporated in the design of this new blowing lance for refining metals.
  • the supersonic jet of refining oxygen exits from the mouth of the lance head at an angle to the axis of the lance, the angle of deflection depending to a large extent on the shape of the wall of said chamber.
  • the supersonic refining oxygen jet can be deflected in this way, the lance is subjected to strong lateral reaction forces which stress the suspension and anchoring points of the lance so much that 'it is difficult to find a reliable solution to these fixing problems in practice. Furthermore, the device according to the Luxembourg patent only allows the deflection of the refining oxygen jet at certain points or well-defined locations.
  • the object of the present invention is to design a blowing lance capable of providing a jet of gas whose speed and flow can be adjusted independently of one another, and whose point of impact on the surface of the bath liquid can be moved continuously during the refining operation.
  • the blowing lance (1) comprises a lance body (2) welded to a lance head (3).
  • the lance body (2) comprises a mantle with four walls (4, 5, 6 and 7) consisting for example of concentric steel tubes spaced apart by means of spacers and connected to the lance head (3), to form a circuit water cooling (9) between the walls (4, 5 and 6) and those of the lance head (3).
  • the inner wall (7) of the lance body (2) forms an annular chamber (10) traversed along its axis aa 'by a coaxial rod (11) for supporting an assembly (12) forming part of a nozzle Laval adjustable.
  • the support rod (11) is preferably formed by a tube which allows the installation of electrical connections (not shown in the Figures) to supply electric current to the various control mechanisms which will be described later.
  • the rod (11) and the inner wall (7) can themselves act as conductors for the supply of electric current to said control mechanisms.
  • the assembly (12) forming part of the adjustable Laval nozzle comprises a translation body (13) attached to the support rod (11) by means of a control mechanism composed by a linear servomotor (14) and a cylindrical sheath (15) in which the translation body (13) can move in the direction of the axis aa 'of the blowing lance (1).
  • the end of the translation body (13) has the shape of a kind of needle whose profile follows a continuous aerodynamic transition curve, in order to minimize the creation of turbulence in the refining gas flow.
  • a concentric conduit (16) for the refining gas that is to say the primary oxygen, is arranged.
  • the concentric conduit (16) has a converging part and a neck, which, in cooperation with the needle of the translation body (13), form a Laval nozzle, the characteristics or parameters can be modified by moving the translation body (13) in the direction of the axis a-a '.
  • This Laval nozzle makes it possible to control the flow of the refining gas independently of the supersonic speed that the jet of refining gas will take when leaving the Laval nozzle by discharging centrally into a cylindrical part (17) of the conduit ( 16) at the outlet of the Laval nozzle.
  • variable Laval nozzle (12) The operation of the variable Laval nozzle (12) is described in more detail in Luxembourg patent No. 87 353, the description of which is incorporated into that of the present patent application.
  • the blowing lance (1) Downstream of the cylindrical part (17) of the pipe (16) of the refining gas, the blowing lance (1) comprises, according to the present invention, a device (18) (see Figure 1a), arranged centrally in the flow of the supersonic jet of the refining gas, in order to separate the latter aerodynamically correct in two distinct and almost equal supersonic jets.
  • a device (18) see Figure 1a
  • These two supersonic refining gas jets open, at the outlet of the separating device (18), into the lance head (3) in which they undergo a deflection at a determined angle, as will be explained below. .
  • the separating device (18) is executed in the form of a rotor whose cylindrical upper part (19) is suspended from a suspension and driving device (20) comprising an upper support (21), as well as a lower support (22).
  • the upper support (21) and the lower support (22) of the rotor (18) comprise ball bearings, the housings of which are tightly but removably attached to the wall (7 ) of the lance body (2).
  • the fastening means are not described since they relate only indirectly to the present invention. They must be chosen so as to allow the technical realization of the present invention and can therefore be different from those shown in Figure 1a which constitute only a preferred embodiment.
  • One or more servomotors (23) installed between the wall (7) of the lance body (2) and the conduit (16) serve to impart a rotational movement to the rotor (18) whose angular speed can be chosen.
  • the actuator shaft (23) is provided with a pinion (24) which drives a ring gear (25) which is provided with the suspension and drive device (20).
  • the rotary separating device (18) essentially consists of two parts which are detachably attached to each other by suitable means such as those shown in (37).
  • the upper part (19) of cylindrical internal shape extends over a certain distance and serves, although in rotary movement, as a course for stabilizing the supersonic jet of refining gas.
  • the lower part or blowing head (27) of the rotor (18) comprises a partition wall (28) which divides this rotor head (27) into two separate chambers (29, 30).
  • the partition wall (28) has, at the point of impact (31) of the refining gas jet, as well as at its detachment point (32), a pointed shape.
  • the inner walls of the chambers (29, 30) of the rotor head are executed to each take the form of a curved half-cylinder, called deflection.
  • the two chambers (29, 30) are offset one with respect to the other and to the central axis aa 'of the lance (1).
  • the central supersonic jet of refining gas at its impact at point (31) of the partition wall (28), is divided into two identical (or almost identical) supersonic jets which pass through the chambers (29 resp. 30) are deflected with respect to the (vertical) axis aa 'of the lance (1) to exit the rotor head (27) at determined angles.
  • the two chambers (29 resp. 30) being offset as described above, there is no interference between the two supersonic jets when they exit the lance head.
  • the two supersonic jets being identical (or almost identical) and emerging at equal (or almost equal) angles from the rotor head (27) but in diametrically opposite directions relative to the axis aa 'of the lance (1) , this is not subjected to radial dynamic forces, since these forces due to supersonic jets are, in the device according to the invention, neutralized since they compensate for each other (apart the existence of a residual torque acting on the rotor).
  • the supports for fixing and guiding the refining lance (1) according to the present invention are therefore not subjected to stresses due to the deviation of the supersonic refining jet relative to the axis of the lance, as such was the case for the devices of the state of the art as described in the Luxembourg patent No. 86 321.
  • the rotor head (27) is driven in a rotational movement, so that the points of impact of the two jets of refining gas on the surface of the liquid metal bath are, during the refining process, moved continuously in a circle whose radius is determined by the angle of deflection of the jets and the distance between the lance head (3) and the metal bath.
  • the deflection angle of the two supersonic refining gas jets is function of the angles of curvature of the interior walls of the deflection chambers (29) and (30).
  • the design of the lance head (3) was chosen in the preferred embodiment of the device according to the invention shown in this Figure, so as to allow its mounting and easy and quick disassembly to the lance body.
  • This design therefore allows rapid exchange of all parts subject to wear, either under the influence of high temperatures prevailing at this location, or by the projection of splashes of molten metal. It also allows rapid exchange of the rotor head (27) in the event that a different deflection angle of the refining gas jets is necessary or desired for a particular application.
  • the rotor head (27) is arranged slightly set back relative to the outlet orifice (33) of the lance head (3).
  • An annular flow of gas, preferably oxygen, takes place between the outer wall of the rotor head (27) and the inner wall of the lance head (3). This annular gas flow is at subsonic speed; it forms an envelope and provides some protection for the rotor head (27).
  • Post-combustion nozzles (34) are arranged in the lance head (3) around the central orifice (33); there are eight nozzles in the embodiment shown. They are arranged regularly around the perimeter of the lance.
  • the post-combustion nozzles (34) are of the "double Prandtl-Meyer” type, as described in Luxembourg patent No. 87 354. They form a practically uninterrupted screen around the two gas jets ripening.
  • the post-combustion nozzles (34) are supplied with oxygen by a secondary flow of gas circulating in the annular space between the walls (6) and (7) of the mantle of the lance (1). This same secondary flow of gas at subsonic speed feeds, via openings (35) arranged in the inner wall (36) of the lance head (3), the annular subsonic flow for protecting the rotor head. (27) described above.
  • the present invention makes available for a method of refining a molten metal bath, a blowing lance which, by its clever design, makes it possible to modify, even during refining, the characteristics of the jet of gas d refining by means of an adjustable Laval nozzle and shifting its point of impact on the liquid bath being ripened by means of a mechanism for dividing rotation and direction (18, 27).
  • the design of the lance is such that it is not subjected in service to mechanical stresses which would question (in doubt) its actual operational use.
  • a secondary gas flow protects the rotating parts against destructive effects from the metal bath, and secondary gas jets provide for post-combustion of the reaction gases escaping from the molten metal bath during the refining process.
  • Figure 7 shows a cross section at the outlet (level of section line CC in Figure 6) of a four-jet lance.
  • the wall Separator (28) has a cross-shaped cross section and the subdivision of the main primary gas duct has four chambers (29 ', 29'',30', 30 ''). Also in this embodiment, none of the four jets interfere with any of the other three jets.

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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)
  • Treatment Of Steel In Its Molten State (AREA)
EP91119298A 1990-12-10 1991-11-13 Blaslanze Withdrawn EP0490101A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87855A LU87855A1 (fr) 1990-12-10 1990-12-10 Lance de soufflage
LU87855 1990-12-10

Publications (1)

Publication Number Publication Date
EP0490101A1 true EP0490101A1 (de) 1992-06-17

Family

ID=19731265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119298A Withdrawn EP0490101A1 (de) 1990-12-10 1991-11-13 Blaslanze

Country Status (7)

Country Link
US (1) US5227118A (de)
EP (1) EP0490101A1 (de)
JP (1) JPH059544A (de)
AU (1) AU644486B2 (de)
BR (1) BR9105106A (de)
CA (1) CA2054612A1 (de)
LU (1) LU87855A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539683A1 (de) * 1991-10-30 1993-05-05 Arbed S.A. Blaslanze
DE4221266C1 (de) * 1992-06-26 1993-10-21 Mannesmann Ag Verfahren und Vorrichtung zum Aufblasen von Sauerstoff auf Metallschmelzen

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU87857A1 (fr) * 1990-12-10 1992-08-25 Arbed Procede de regulation de l'operation d'affinage de fonte
SE511424C2 (sv) * 1993-12-30 1999-09-27 Stiftelsen Metallurg Forsk Ringspaltdysa och sätt att blåsa en metallsmälta
US6599464B1 (en) * 1999-10-06 2003-07-29 Bernd Feldhaus Steelmaking lance with integral temperature probe
GB0209364D0 (en) * 2002-04-24 2002-06-05 Boc Group Plc Injection of particulate material into liquid
JP6347200B2 (ja) * 2014-10-10 2018-06-27 新日鐵住金株式会社 Ｒｈ真空脱ガス設備の上吹きランス装置
JP7192465B2 (ja) * 2018-12-13 2022-12-20 日本製鉄株式会社 上吹きランス

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234388A2 (de) * 1986-02-25 1987-09-02 Arbed S.A. Sauerstoff-Blaslanze
EP0235621A2 (de) * 1986-02-25 1987-09-09 Arbed S.A. Sauerstoff-Blaslanze
EP0364721A1 (de) * 1988-09-28 1990-04-25 Arbed S.A. Lanze zum Blasfrischen
EP0364722A1 (de) * 1988-09-28 1990-04-25 Arbed S.A. Sauertoff-Blaslanze

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU789589A1 (ru) * 1979-02-26 1980-12-23 Сибирский Металлургический Институт Им. С.Орджоникидзе Фурма дл продувки жидкого металла
CA1293121C (en) * 1985-08-20 1991-12-17 Nobuyoshi Takashiba Lance for blow-refinement in converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234388A2 (de) * 1986-02-25 1987-09-02 Arbed S.A. Sauerstoff-Blaslanze
EP0235621A2 (de) * 1986-02-25 1987-09-09 Arbed S.A. Sauerstoff-Blaslanze
EP0364721A1 (de) * 1988-09-28 1990-04-25 Arbed S.A. Lanze zum Blasfrischen
EP0364722A1 (de) * 1988-09-28 1990-04-25 Arbed S.A. Sauertoff-Blaslanze

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539683A1 (de) * 1991-10-30 1993-05-05 Arbed S.A. Blaslanze
US5303901A (en) * 1991-10-30 1994-04-19 Arbed S.A. Blowing lance with cyclic modulator means for varying flow rate
DE4221266C1 (de) * 1992-06-26 1993-10-21 Mannesmann Ag Verfahren und Vorrichtung zum Aufblasen von Sauerstoff auf Metallschmelzen

Also Published As

Publication number Publication date
CA2054612A1 (en) 1992-06-11
AU644486B2 (en) 1993-12-09
AU8687191A (en) 1992-06-11
JPH059544A (ja) 1993-01-19
US5227118A (en) 1993-07-13
BR9105106A (pt) 1992-08-18
LU87855A1 (fr) 1992-08-25

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