EP0594326A1 - Lanze zum Einbringen von Behandlungsmitteln in Metallschmelzen - Google Patents

Lanze zum Einbringen von Behandlungsmitteln in Metallschmelzen Download PDF

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Publication number
EP0594326A1
EP0594326A1 EP93307955A EP93307955A EP0594326A1 EP 0594326 A1 EP0594326 A1 EP 0594326A1 EP 93307955 A EP93307955 A EP 93307955A EP 93307955 A EP93307955 A EP 93307955A EP 0594326 A1 EP0594326 A1 EP 0594326A1
Authority
EP
European Patent Office
Prior art keywords
lance
inner tube
tube
outlet
lance according
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
EP93307955A
Other languages
English (en)
French (fr)
Other versions
EP0594326B1 (de
Inventor
Edmund Fuchs
Alfons Oskamp
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.)
Foseco International Ltd
Original Assignee
Foseco International Ltd
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 Foseco International Ltd filed Critical Foseco International Ltd
Publication of EP0594326A1 publication Critical patent/EP0594326A1/de
Application granted granted Critical
Publication of EP0594326B1 publication Critical patent/EP0594326B1/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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C5/4613—Refractory coated lances; Immersion lances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge

Definitions

  • This invention relates to a lance of the type used to introduce reactants into molten metal, e.g. steel, in a molten metal handling vessel.
  • a lance may be used, for example, to introduce desulphurisation agents into molten steel.
  • lances are usually of monolithic construction consisting of a thick-walled inner-tube of steel with welded reinforcement ribs of sectional steel and various types of holding elements and with barbed wire wrapped round to bind the refractory material. There is no air gap between the inner tube and the refractory material.
  • the aim of the operator of a desulphurisation unit is to optimise the total quantity of desulphur-isation agent (kg per ton of hot metal) in order to reduce hot metal losses on the one hand and to minimise treatment times on the other hand.
  • This can be achieved by using a higher grade desulphurising agent, i.e. a concentration of CaC 2 to Mg of up to 2:1 or by injecting pure magnesium.
  • the present invention aims to improve the operating reliability and, hence, availability of a hot-metal unit by providing a lance which does not allow an excessively high temperature increase during use.
  • the invention provides a lance comprising an inner tube having an inlet adjacent one end and an outlet adjacent its other end, whereby reactant can be injected through the lance, an outer tube from which the inner tube is spaced to provide an annular air gap between the two tubes, the outer tube having a refractory casing, and a gas pipe extending between the inner and outer tubes and having its outlet adjacent the region of the outlet of the inner tube, whereby gas passing through the pipe can exit to atmosphere through said annular air gap.
  • Cooling gas can, therefore, be delivered between the inner and outer tubes, which will normally be of steel, and to the region of the outlet of the nozzle.
  • the gas tube will be fitted to extend around the inner-tube in a spiral configuration, at least for part of the length of the inner tube approaching and up to the outlet end.
  • the gas pipe may extend parallel to the longitudinal axis of the tube.
  • the objective of the invention is met by providing a lance of such a construction that it can be very effectively cooled with suitable delivery of cooling gas.
  • the inner tube is conveniently mounted inside the outer tube by means of spacers, which in the preferred embodiment, will ensure that the two tubes are concentrically disposed.
  • lance 10 has a thick-walled steel inner tube 11 with welded reinforcing ribs 12.
  • Tube 11 is set in a refractory casing 13 for the proportion of its length that will be immersed in molten metal during use.
  • the lance has an inlet 14 at the unencased end of tube 11, inlet 14 being connectable to a source of reactant to be injected.
  • the other end of tube 11 has an outlet 15 which emerges into an outlet passageway 16 in the refractory casing, thereby forming the outlet of the lance.
  • Figure 2 shows an improved lance 20 of the invention.
  • This comprises a steel inner tube 21 extending inside and spaced from the walls of a steel outer tube 23 by spacers (not shown), and extending beyond outer tube 23 to its inlet end 22.
  • Outer tube 23 has a protective refractory casing 25. The spacing of tubes 21 and 23 provides an annular air gap 24.
  • inner tube 21 feeds to radially-disposed outlets 26, which extend through refractory casing 25 to the exterior of the lance.
  • the cooling gas passed through pipe 27 therefore emerges in annular gap 24 adjacent the outlets of the lance and passes back along between the tubes 21 and 23 to exit at the opposite end of tube 23 to the nozzle outlet end, thereby cooling the whole of that portion of the lance that is immersed in molten metal in use.
  • the innertube 21 is well insulated, thus preventing uncontrolled heating of the inner tube if the cooling system breaks down.
  • the refractory casing 25 has a steel reinforcement 28 which extends longitudinally and substantially parallel to tube 23.
  • the reinforcement 28 is anchored to the outlet end only of inner tube 21 by anchor pieces 29. These are the only anchorage points used over the whole length of the refractory casing 25.
  • this means of attachment allows the refractory casing and the outer tube to move freely in relation to one another as they expand or contract on heating or cooling without risk of cracking of the refractory material.
  • Reinforcement 28 may be, for example, a number of longitudinally-extending steel bars spaced around and equidistant from the tube 23.
  • the lance is preferably cooled with compressed air at a pressure, for example, of 6 bar.
  • the passage of cooling gas is commenced as treatment of molten metal through the lance commences and will normally end a pre-determined time after the end of the treatment.
  • the transport gas delivery line may, for example, be turned on three times. This mode of operation ensures that any loose deposits in the covey- ing line or in the lance are blown out. Magnesium particles already adhering to the lance wall and outlet orifices cannot be removed this way, however, and this is normally carried out mechanically, as far as such deposits can be reached.
  • Magnesium residues can, however, be burnt off with air in the hot lance. This advantage can be utilised by using compressed air instead of nitrogen to clean the lance aftertreatment. An additional changeover valve from nitrogen to compressed air can be easily fitted for this purpose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Furnace Charging Or Discharging (AREA)
EP93307955A 1992-10-17 1993-10-06 Lanze zum Einbringen von Behandlungsmitteln in Metallschmelzen Expired - Lifetime EP0594326B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929221842A GB9221842D0 (en) 1992-10-17 1992-10-17 Lance
GB9221842 1992-10-17

Publications (2)

Publication Number Publication Date
EP0594326A1 true EP0594326A1 (de) 1994-04-27
EP0594326B1 EP0594326B1 (de) 1997-09-17

Family

ID=10723617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93307955A Expired - Lifetime EP0594326B1 (de) 1992-10-17 1993-10-06 Lanze zum Einbringen von Behandlungsmitteln in Metallschmelzen

Country Status (5)

Country Link
EP (1) EP0594326B1 (de)
DE (1) DE69313971T2 (de)
ES (1) ES2109444T3 (de)
FI (1) FI100726B (de)
GB (1) GB9221842D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007021238A1 (en) * 2005-08-19 2007-02-22 Aga Ab Lance to be used during combustion

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109210936B (zh) * 2018-10-18 2019-09-20 江苏新春兴再生资源有限责任公司 一种熔炼炉用的侧吹喷枪及使用方法
CN109458849A (zh) * 2019-01-07 2019-03-12 姚清清 一种喷枪

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062217A1 (de) * 1981-04-02 1982-10-13 Mono Construction Limited Metallurgische Lanze
DE3423192A1 (de) * 1984-06-22 1986-01-02 Krupp Polysius Ag, 4720 Beckum Tauchlanze
DE3501970A1 (de) * 1985-01-22 1986-07-24 Plibrico Co GmbH, 4000 Düsseldorf Lanze fuer die behandlung von roheisen oder stahl
BE1000803A7 (fr) * 1987-08-07 1989-04-11 Centre Rech Metallurgique Lance d'injection immergee et procede de refroidissement d'une telle lance.
US4913735A (en) * 1989-02-09 1990-04-03 Palmer Manufacturing & Supply, Inc. Flux injector lance for use in processing aluminum and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062217A1 (de) * 1981-04-02 1982-10-13 Mono Construction Limited Metallurgische Lanze
DE3423192A1 (de) * 1984-06-22 1986-01-02 Krupp Polysius Ag, 4720 Beckum Tauchlanze
DE3501970A1 (de) * 1985-01-22 1986-07-24 Plibrico Co GmbH, 4000 Düsseldorf Lanze fuer die behandlung von roheisen oder stahl
BE1000803A7 (fr) * 1987-08-07 1989-04-11 Centre Rech Metallurgique Lance d'injection immergee et procede de refroidissement d'une telle lance.
US4913735A (en) * 1989-02-09 1990-04-03 Palmer Manufacturing & Supply, Inc. Flux injector lance for use in processing aluminum and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007021238A1 (en) * 2005-08-19 2007-02-22 Aga Ab Lance to be used during combustion

Also Published As

Publication number Publication date
FI100726B (fi) 1998-02-13
GB9221842D0 (en) 1992-12-02
DE69313971T2 (de) 1998-03-19
EP0594326B1 (de) 1997-09-17
ES2109444T3 (es) 1998-01-16
FI934562A0 (fi) 1993-10-15
DE69313971D1 (de) 1997-10-23
FI934562L (fi) 1994-04-18

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