EP0165198B1 - Lanze zur Beschleunigung fester Teilchen - Google Patents

Lanze zur Beschleunigung fester Teilchen Download PDF

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Publication number
EP0165198B1
EP0165198B1 EP85630080A EP85630080A EP0165198B1 EP 0165198 B1 EP0165198 B1 EP 0165198B1 EP 85630080 A EP85630080 A EP 85630080A EP 85630080 A EP85630080 A EP 85630080A EP 0165198 B1 EP0165198 B1 EP 0165198B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
acceleration
gas
mouth
solid particles
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
EP85630080A
Other languages
English (en)
French (fr)
Other versions
EP0165198A3 (en
EP0165198A2 (de
Inventor
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 AT85630080T priority Critical patent/ATE54335T1/de
Publication of EP0165198A2 publication Critical patent/EP0165198A2/de
Publication of EP0165198A3 publication Critical patent/EP0165198A3/fr
Application granted granted Critical
Publication of EP0165198B1 publication Critical patent/EP0165198B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material

Definitions

  • the present invention relates to an adaptation device for a nozzle for accelerating solid particles using a carrier gas.
  • Such nozzles serve in particular to introduce pulverulent carboniferous material into a steel bath.
  • the rate of scrap metal or other cooling additions that one manages to incorporate into a metal in the process of refining depends mainly on the composition of the cast iron, the temperature of the charge and the thermodynamic course of the refining operation. To reduce the cost price of steel, it is imperative to exceed the current addition rates of some 400 kg of scrap metal per ton of pig iron.
  • One of the known methods consists in increasing the afterburning rate of the CO emerging from the bath, while ensuring that the bath absorbs a maximum of the released heat. Another method is to heat the metal bath using additional energy sources. Techniques for adding gas and liquid fuel have been used with various successes. Likewise, techniques for adding combustible material in the form of granules of carbonaceous material have been developed.
  • the incorporation of solids in the bath can be done from below, through nozzles or permeable elements housed in the bottom of the converter, or from the top together with gaseous materials.
  • gaseous materials to have in this latter case a suitable absorption of the carbonaceous material by the bath, it is necessary that the latter not only present well-defined oxygen and carbon concentrations, but it is also necessary that the carbonaceous material has an energy kinetics and sufficient concentration at the exit of the lance to enter the bath. High kinetic energy is also required to avoid premature combustion of the carbonaceous matter above the bath.
  • the object of the present invention is to propose a nozzle which limits the phenomena described under points a and c above and which ensures a high penetration depth of the particles in the liquid bath, on condition that the oxygen nozzles are arranged appropriately.
  • the acceleration nozzle is extended by a part whose flare angle is greater than that of the acceleration nozzle and is surrounded towards its mouth by a second nozzle forming envelope and connected to a gas source.
  • the slots act as a separator of the gaseous phases and solid particles and prevent the solid particles from entering the nozzle forming an envelope.
  • the advantages of the invention consist in obtaining a jet of carbonaceous material whose angle of divergence A is less than 2 ° (for blank tests). Provided that A remains less than Asauli in the crucible, the theoretical penetration depth will be approximately 2 m. In addition, the additional gas jet prevents premature combustion of the granulated material over the metal bath.
  • Fig. 1 schematically represents a section through a part of a lance head produced in accordance with the present invention.
  • a part of a nozzle 1 is distinguished, connected, to a source (not shown) of solid particles and gas and guiding the jet of carrier gas / materials 2.
  • the gas carrier has a speed V1 greater than 300 m / s while the speed V2 of the granules of solid material is less than 200 m / s.
  • the difference of section of the two bases 3 and 5 of the conical part 4 is chosen such that the speed of the carrier gas is comparable to that of the solid particles at the mouthpiece 5. - Given the short length of the conical part 4, the speed of the particles solids varies little. -
  • a nozzle 8 connected to a source of pressurized gas (not shown), is concentric with the central nozzle 1 and forms an envelope around the latter. It has, towards the mouth of the device, parallel internal and external walls, so as to create a gas flow 10 which is substantially parallel.
  • the gas 10 acting as a screen is preferably of the same nature as the carrier gas and has, passing between the parallel walls, a speed or very close to that of the carrier gas after the passage of the latter through the room.
  • conical 4, or else supersonic by means of the addition of an annular Laval nozzle, as indicated in dotted line 12- in fig. 1).
  • the source of turbulence in the gas 10 the latter is advantageously extended by a cylindrical part 6, the wall of which tapers towards its mouth 7.
  • the conduit which guides the mixture of carrier gas / solid particles also acts as an inner wall of the nozzle forming an envelope as it approaches its mouth. It is advantageous to place the mouth 7 of the conduit which guides the mixture of carrier gas / solid particles set back from the mouth 9 of the nozzle 8 which forms an envelope. This makes it possible to blow during the refining and between the recarburization phases only of the gas (having a cooling role and of protection against splashes of slag and metal) through the nozzle 8.
  • the gas used can be neutral or oxidizing ; when it is oxidizing, a slight overpressure must be maintained inside the nozzle 1. During the recarburization phases, it is advisable to choose a neutral screen gas.
  • the lance also comprises several nozzles (not shown), arranged at equal distance around the central nozzle, providing the refining oxygen jets. These oxygen jets are inclined at a determined angle X relative to the axis of the lance. In a first zone, close to the lance head, the suction effect of the refining oxygen jets and the shear flow 11 which results therefrom, mainly disturbs the flow of gas-screen without excessively enlarging and disturbing the carrier gas jet / solid materials, which therefore retains its penetrating properties.
  • the angle X determines the extent of a second zone, located in the extension of the first zone and which is characterized by the simultaneous presence of gas (carrier gas, screen gas and refining oxygen) of steel drops in origin of the bath and of powdery carboniferous material. It is ultimately all the parameters governing the width of this second zone which influence the dissolution of the coal particles in the liquid steel in a third zone, located in the extension of the first and second zones and the upper limit of which is the surface of the steel bath.
  • gas carrier gas, screen gas and refining oxygen

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Nozzles (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Glanulating (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Joints Allowing Movement (AREA)
  • Gas Separation By Absorption (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Supports For Pipes And Cables (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Disintegrating Or Milling (AREA)

Claims (10)

1. Ampassungsvorrichtung für eine Lanze zur Beschleunigung von Feststoffpartikeln, insbesondere von zur Aufkohlung eines Stahlbades bestimmten pulverigen kohlenstoffhaltigen Materialien, wobei die Beschleunigungsdüse (1) mit einer Vorratsquelle für Gas und einer solchen für Feststoffpartikel in Verbindung steht, sie verlängert ist durch ein Stück (4) dessen Aufweitungswinkel grösser ist als derjenige der Düse (1), sie in Richtung auf die Mündung zu von einer zweiten Düse (8) umgeben ist, welche eine Hülle bildet und an eine Gaszufuhr angeschlossen ist.
2. Vorrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass die eine Hülle bildende Düse (8) in Richtung auf ihre Mündung zu innere und äussere Wände aufweist, welche parallel zueinander sind.
3. Vorrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass die eine Hülle bildende Düse (8) eine gegenüber ihrer Mündung stromaufwärts liegende ringförmige Laval-Düse (12) darstellt.
4. Vorrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass das Stück (4), dessen Aufweitungswinkel grösser ist als derjenige der Beschleunigungsdüse (1) ein Kegelstumpf ist.
5. Vorrichtung gemäss einem der Ansprüche 1 oder 4, dadurch gekennzeichnet, dass das Stück (4), dessen Aufweitungswinkel grösser ist als derjenige der Beschleunigungsdüse (1), eine zwischen 10 cm und 50 cm liegende Länge aufweist.
6. Vorrichtung gemäss einem der Ansprüche 1 oder 4, dadurch gekennzeichnet, dass der besagte Aufweitungswinkel um die 2 Grad liegt.
7. Vorrichtung gemäss einem der Ansprüche 1 oder 4, dadurch gekennzeichnet, dass das Stück (4), dessen Aufweitungswinkel grösser ist als derjenige der Beschleunigungsdüse (1), durch ein rohrförmiges Stück (6) verlängert ist.
8. Vorrichtung gemäss Anspruch 7, dadurch gekennzeichnet, dass das rohrförmige Stück (6) ein Zylinder ist, dessen Wand sich in die Richtung auf die Mündung (7) hin verjüngt.
9. Vorrichtung gemäss einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Mündung (7) der die Feststoffpartikel befördernden Leitung (1, 4, 6) nach oben versetzt ist gegenüber der Mündung (9) der eine Hülle bildenden Düse (8).
10. Vorrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass die eine Hülle bildende Düse (8) über Rillen, die in der Beschleunigungsdüse (1) vorgesehenen sind, mit der die Beschleunigungsdüse (1) speisenden Gasquelle in Verbindung steht.
EP85630080A 1984-05-15 1985-05-14 Lanze zur Beschleunigung fester Teilchen Expired - Lifetime EP0165198B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85630080T ATE54335T1 (de) 1984-05-15 1985-05-14 Lanze zur beschleunigung fester teilchen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85363 1984-05-15
LU85363A LU85363A1 (fr) 1984-05-15 1984-05-15 Dispositif d'adaptation pour tuyere d'acceleration de particules solides

Publications (3)

Publication Number Publication Date
EP0165198A2 EP0165198A2 (de) 1985-12-18
EP0165198A3 EP0165198A3 (en) 1987-03-18
EP0165198B1 true EP0165198B1 (de) 1990-07-04

Family

ID=19730259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85630080A Expired - Lifetime EP0165198B1 (de) 1984-05-15 1985-05-14 Lanze zur Beschleunigung fester Teilchen

Country Status (16)

Country Link
US (1) US4655647A (de)
EP (1) EP0165198B1 (de)
JP (1) JPS6112814A (de)
KR (1) KR930001328B1 (de)
AT (1) ATE54335T1 (de)
AU (1) AU569620B2 (de)
BR (1) BR8502209A (de)
CA (1) CA1278679C (de)
DE (1) DE3578531D1 (de)
ES (1) ES8608113A1 (de)
FI (1) FI77473C (de)
IN (1) IN164290B (de)
LU (1) LU85363A1 (de)
NO (1) NO165929C (de)
PT (1) PT80469B (de)
ZA (1) ZA853446B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU86225A1 (de) * 1985-12-23 1987-07-24 Arbed Verfahren zum herstellen von hochwertigem stahl
JPH0730527Y2 (ja) * 1987-09-05 1995-07-12 義正 笠倉 包装用缶
US5576495A (en) * 1995-10-23 1996-11-19 The Babcock & Wilcox Company Two phase flow meter
RU2145644C1 (ru) * 1998-11-05 2000-02-20 Дикун Юрий Вениаминович Способ получения покрытия из порошковых материалов и устройство для его осуществления
AT408348B (de) * 1999-12-20 2001-10-25 Voest Alpine Ind Anlagen Verfahren und vorrichtung zum zuführen eines gases in ein metallurgisches gefäss

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE576161A (fr) * 1958-03-03 1959-08-26 Siderurgie Fse Inst Rech Dispositif pour communiquer des vitesses élevées à des particules en suspension dans un gaz.
AT225213B (de) * 1960-05-27 1963-01-10 Oesterr Alpine Montan Verfahren und Einrichtung zur Einbringung von Zusatzstoffen in kohlenstoffhaltige Eisenbäder
AT238237B (de) * 1961-05-18 1965-01-25 Voest Ag Blaseinrichtung zur Durchführung metallurgischer Prozesse
US3876190A (en) * 1969-06-25 1975-04-08 Commw Ind Gases Method and apparatus for feeding particulate materials to furnaces and the like
DE2046415C3 (de) * 1970-09-19 1974-01-17 Sser Griesheim Gmbh, 6000 Frankfurt Schneidbrenner
DE2521253A1 (de) * 1975-05-13 1976-11-25 Linde Ag Brennschneidduese
JPS5314475A (en) * 1976-07-26 1978-02-09 Fumio Hori Gas separating method and system
FR2432552A1 (fr) * 1978-08-03 1980-02-29 Siderurgie Fse Inst Rech Lance a double flux pour l'insufflation en profondeur de produits pulverulents au sein d'une masse en fusion
US4362441A (en) * 1979-05-07 1982-12-07 Lockheed Missiles & Space Company, Inc. Means and apparatus for throttling a dry pulverized solid material pump
LU83814A1 (fr) * 1981-12-04 1983-09-01 Arbed Procede et dispositif pour l'affinage d'un bain de metal contenant des matieres refroidissantes solides
LU84433A1 (fr) * 1982-10-22 1984-05-10 Mecan Arbed Dommeldange S A R Dispositif pour fournir des matieres gazeuses et solides a un bain de metal en voie d'affinage
LU84444A1 (fr) * 1982-10-27 1984-05-10 Arbed Systeme de reglage de l'alimentation en matieres solides d'une lance de soufflage
LU84686A1 (fr) * 1983-03-11 1984-11-14 Arbed Dispositif d'acceleration de particules solides

Also Published As

Publication number Publication date
ES8608113A1 (es) 1986-06-01
JPS6112814A (ja) 1986-01-21
FI77473C (fi) 1989-03-10
FI851930A0 (fi) 1985-05-15
KR850008632A (ko) 1985-12-21
DE3578531D1 (de) 1990-08-09
EP0165198A3 (en) 1987-03-18
NO165929B (no) 1991-01-21
ES543148A0 (es) 1986-06-01
NO851931L (no) 1985-11-18
FI77473B (fi) 1988-11-30
EP0165198A2 (de) 1985-12-18
ATE54335T1 (de) 1990-07-15
PT80469A (fr) 1985-06-01
IN164290B (de) 1989-02-11
LU85363A1 (fr) 1986-01-29
CA1278679C (fr) 1991-01-08
BR8502209A (pt) 1986-01-14
AU569620B2 (en) 1988-02-11
US4655647A (en) 1987-04-07
NO165929C (no) 1991-05-02
KR930001328B1 (ko) 1993-02-26
ZA853446B (en) 1986-01-29
AU4246285A (en) 1985-11-21
PT80469B (pt) 1987-08-19
FI851930L (fi) 1985-11-16

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