EP0104326A2 - Lance à deux circuits pour l'affinage des métaux en fusion - Google Patents

Lance à deux circuits pour l'affinage des métaux en fusion Download PDF

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Publication number
EP0104326A2
EP0104326A2 EP83106221A EP83106221A EP0104326A2 EP 0104326 A2 EP0104326 A2 EP 0104326A2 EP 83106221 A EP83106221 A EP 83106221A EP 83106221 A EP83106221 A EP 83106221A EP 0104326 A2 EP0104326 A2 EP 0104326A2
Authority
EP
European Patent Office
Prior art keywords
tube
lance
oxygen
central tube
nozzle 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Withdrawn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
EP83106221A
Other languages
German (de)
English (en)
Other versions
EP0104326A3 (fr
Inventor
Willi Bäcker
Josef Dr.Ing. Schoop
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.)
Saar-Metallwerke GmbH
Saar Metallwerke GmbH
Original Assignee
Saar-Metallwerke GmbH
Saar Metallwerke GmbH
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 Saar-Metallwerke GmbH, Saar Metallwerke GmbH filed Critical Saar-Metallwerke GmbH
Publication of EP0104326A2 publication Critical patent/EP0104326A2/fr
Publication of EP0104326A3 publication Critical patent/EP0104326A3/fr
Withdrawn legal-status Critical Current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 invention relates to a lance for freshening metal, in particular iron melts with oxygen-containing gases from a central tube, a plurality of concentric jacket tubes, a nozzle head and a plurality of nozzles arranged at a vertical distance from one another.
  • primarily water-cooled lances are used, which in their simplest design have a central tube surrounded by two concentric tubes, each at a distance from the neighboring tube, which ends in a nozzle head at the tip of the lance.
  • the inner ring gap that results between the pipes is connected to a cooling water supply line and is connected in the region of the nozzle head to the outer ring gap, through which the cooling water flows back to a cooling water discharge line against the direction of flow of the oxygen flowing through the central pipe.
  • the distance between the tip of the lance and the bath can be adjusted and the oxygen can be regulated in terms of quantity and pressure, it has been shown that with single-hole lances it is not possible to freshen up to suit all conditions. In particular, in the case of larger vessels and thus higher amounts of oxygen, it has been shown that the blowing process cannot be mastered with single-hole lances.
  • lances with secondary nozzles arranged at a distance from the tip of the lance and connected to a separate oxygen line.
  • the nozzles - mostly in groups - are connected to two independently adjustable oxygen circuits, a refreshing with different oxygen throughput is possible for the primary nozzles located in the center of the nozzle head and the secondary nozzles arranged above, and thus an effective afterburning of the carbon monoxide.
  • these lances have a short lifespan because they are subject to different thermal expansions. These thermal expansions result from the fact that the lance usually projects up to about 6 m into the converter and heats up to about 400 ° C. despite its water cooling.
  • the thermal expansion is very different because of the different materials; they can be so strong that high tensions occur and the lance's service life suffers considerably.
  • the temperature load is particularly high, because due to the extensive post-combustion of the carbon monoxide in the area around the lance, the temperature is much higher than with conventional lances.
  • the invention is therefore based on the object, the aforementioned disadvantages resulting from the different thermal expansion of the conventional two-circuit lances. to fix.
  • the solution to this problem is that according to the invention a central tube, a secondary circuit tube and a connecting tube are flexibly connected to each other in a lance of the type mentioned.
  • a secondary circular pipe with an oxygen ring gap in the upper pipe area can be slidably guided on the central pipe, from which at least one secondary nozzle emerges.
  • the Se secondary circular tube can in turn be slidably guided in or on a connecting tube concentrically surrounding the central tube at a distance. Seals should be located in the area of the pipe guides in order to seal the annular gaps between the individual concentric pipes even when the pipes are moved.
  • the pipe guides according to the invention absorb the different thermal expansions of the lance pipes.
  • the pipe guides are particularly important because the secondary nozzles extend through two cooling water pipes of the cooling water circuit which surround the central pipe, the secondary circular pipe and the connecting pipe, each at a distance from the neighboring pipe.
  • the two cooling water pipes, the secondary circuit pipe and the nozzle head are coupled practically rigidly with one another in conventional lances, so that different thermal expansions without a corresponding pipe guide can lead to considerable internal stresses.
  • this danger does not exist, since the secondary circuit tube coupled to the two cooling water tubes via the secondary nozzles is movably guided in or on the connecting tube.
  • pipe guides according to the invention are simple plug-in connections which are not only easy and inexpensive to manufacture, but also allow the parts to be replaced quickly and reused.
  • the lance according to the invention thus has two of them separate and accordingly also controllable oxygen circuits from the annular gap 5 and the nozzles 7 emanating from it on the one hand and the central tube 1 with the nozzles 13 on the other.
  • the nozzles 7, 13 are rigidly connected to one another via the pipes 8, 9 and the nozzle head 12 and the individual pipes are subjected to a very different temperature load with correspondingly different thermal expansions, inadmissible stresses cannot occur in the lance according to the invention, since the pipes 2 and 3 are slidably guided. Leakages on the guide surfaces cannot occur since 0-rings 14, 15, 16 are arranged in their area, which seal the interior. seal the central tube 2 or the annular gap 5 against the annular gap 10.

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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
EP83106221A 1982-08-27 1983-06-25 Lance à deux circuits pour l'affinage des métaux en fusion Withdrawn EP0104326A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823231867 DE3231867A1 (de) 1982-08-27 1982-08-27 Zweikreislanze zum frischen von metallschmelzen
DE3231867 1982-08-27

Publications (2)

Publication Number Publication Date
EP0104326A2 true EP0104326A2 (fr) 1984-04-04
EP0104326A3 EP0104326A3 (fr) 1984-05-16

Family

ID=6171817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106221A Withdrawn EP0104326A3 (fr) 1982-08-27 1983-06-25 Lance à deux circuits pour l'affinage des métaux en fusion

Country Status (2)

Country Link
EP (1) EP0104326A3 (fr)
DE (1) DE3231867A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1293121C (fr) * 1985-08-20 1991-12-17 Nobuyoshi Takashiba Lance d'injection pour l'affinage de l'acier dans un convertisseur
LU86329A1 (fr) * 1986-02-28 1987-09-10 Arbed Tuyere pour lance d'affinage
US5865876A (en) * 1995-06-07 1999-02-02 Ltv Steel Company, Inc. Multipurpose lance
US5830259A (en) * 1996-06-25 1998-11-03 Ltv Steel Company, Inc. Preventing skull accumulation on a steelmaking lance
US5885323A (en) * 1997-04-25 1999-03-23 Ltv Steel Company, Inc. Foamy slag process using multi-circuit lance

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU52104A1 (fr) * 1966-10-04 1968-05-07
GB934112A (en) * 1961-03-16 1963-08-14 Consett Iron Company Ltd An improved blowing lance
US3488044A (en) * 1967-05-01 1970-01-06 Nat Steel Corp Apparatus for refining metal
BE759146A (fr) * 1969-12-04 1971-04-30 Demag Ag Lance de soufflage pour l'amenee de gaz ou de matieres de reaction pulverulentes dans les processus metallurgiques
US3730505A (en) * 1970-07-01 1973-05-01 Centro Speriment Metallurg Double delivery lance for refining the steel in the converter processes
DE2103050C3 (de) * 1971-01-22 1973-11-22 Gosudarstwenny Sojusnyj Institut Po Projektirowaniju Sauerstoff Blaslanze fur ein Stahlschmelzaggregat

Also Published As

Publication number Publication date
EP0104326A3 (fr) 1984-05-16
DE3231867A1 (de) 1984-03-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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PUAL Search report despatched

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AK Designated contracting states

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18D Application deemed to be withdrawn

Effective date: 19850419

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BAECKER, WILLI

Inventor name: SCHOOP, JOSEF, DR.ING.