US3531097A - Oxygen lance - Google Patents

Oxygen lance Download PDF

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Publication number
US3531097A
US3531097A US625740A US3531097DA US3531097A US 3531097 A US3531097 A US 3531097A US 625740 A US625740 A US 625740A US 3531097D A US3531097D A US 3531097DA US 3531097 A US3531097 A US 3531097A
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US
United States
Prior art keywords
lance
tube
furnace
oxygen
pipe
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
US625740A
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English (en)
Inventor
Michael Paulina
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.)
Pittsburgh Steel Co
Original Assignee
Pittsburgh Steel Co
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 Pittsburgh Steel Co filed Critical Pittsburgh Steel Co
Application granted granted Critical
Publication of US3531097A publication Critical patent/US3531097A/en
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

  • Substantially pure oxygen supplied under high pressure to the upper end of the lance, issues from its nozzle and causes great turbulance as an exothermic reaction increases the temperature of the charge in the furnace until all of it is melted and converted into steel. The lance then is with drawn and the furnace is tilted to pour the molten metal from it.
  • a long vertical oxygen pipe is adapted to be connected at its upper end to a source of oxygen under pressure, and its lower end is connected to a nozzle.
  • This pipe is encircled by a concentric tube, the lower end of which is joined with the nozzle.
  • a long length of the lance is adapted to be inserted down into a steel-making vessel forming a basic oxygen furnace.
  • the tube, adjacent the upper end of the portion in the furnace, is enlarged relative to the tube above and tapers gradually downwardly therefrom to a point adjacent the nozzle.
  • the taper is at least inch per lineal foot.
  • FIG. 1 is a fragmentary side view, partly in section, of
  • the lance extends down through an exhaust hood 7 directly above the charging opening in the furnace.
  • the furnace is supported in conventional manner so that it can be tilted for charging and discharging while the lance is raised.
  • the outer wall of the lance is made from a tube 8 which, for the major portion of its length, is in the neigborhood of a foot in diameter.
  • the one shown is actually 10% inches in diameter above the furnace.
  • a nozzle 9 Joined to the lower end of this tube there is a nozzle 9 provided with one or more downwardly directed passages 10.
  • the diameter of the nozzle is substantially the same as the tube above the furnace.
  • an oxygen pipe 12 Disposed inside the tube concentrically therewith is an oxygen pipe 12, the lower end of which is joined to the nozzle around the passages therein.
  • the upper end of this pipe extends above the sealed end of tube 8 and is connected with a high pressure oxygen hose 13 (FIG. 1) that delivers oxygen to the pipe from a suitable source.
  • the pipe is spaced from the inside of the tube so that a water jacket can be formed around the pipe in order to cool the tube.
  • another pipe 14 encircles the oxygen pipe and is spaced from it and the outer tube. The spaces at opposite sides of this second pipe are closed at its top but are connected down in the nozzle to form concentric vertical passages connected at their lower ends.
  • the passage between the two pipes is connected with a water supply hose 15, while the passage between the outer pipe and the tube is connected with a Water discharge hose 16. Consequently, water is circulated down inside pipe 14 and then up in contact with the inner surface of the tube.
  • the lance will periodically shed any coating of molten metal that splatters onto it inside the furnace during the blow.
  • the portion of the lance in the furnace is tapered downwardly.
  • the diameter of the lance tube 8 is enlarged, such as by flaring the tube downwardly for a short distance, for example, about two feet.
  • the diameter of the lower end of the flare is about three inches greater than the straight tube above it. From this point down to the nozzle the tube is tapered. Due to the length of the portion of the lance inside the furnace, the taper is very gradual. It should be at least M inch per foot to obtain the desired result but, due to factors that limit the size of the lance at the upper end of the tapered portion, the taper is not likely to exceed 43 inch per foot.
  • the splattering slag and metal that build up a coating on the tapered portion of the lance will, because of the weight of the deposit, release from the lance periodically and slide down it into the furnace, thereby making it unnecessary to burn or chip away the deposit.
  • friction alone can prevent such a coating from sliding down a cylindrical lance, the slightest amount of downward movement of the deposited material on the tapered lance will eliminate friction and allow the deposit to fall away.
  • a coating is deposited on the lance while it is retracted, the deposit will cool and shrink. During the next blowing cycle, however, the heat will expand the coating, causing it to drop ofi. If too thick a deposit appears to be building up on the lance without releasing itself, removal can be accelerated by striking the lance a few heavy blows to cause it to vibrate and shed the deposit.
  • An oxygen lance for a basic oxygen furnace comprising a long rigid vertical tube having a lower portion of predetermined length adapted to be inserted down into such a furnace, a nozzle joined to the lower end of the tube and provided with a passage for oxygen, an oxygen pipe rigidly mounted inside the tube concentric therewith and spaced therefrom to form an annular cooling chamber which surrounds the pipe and extends substantially through the entire length of the nozzle, the lower end of the oxygen pipe being connected with the upper end of said nozzle passage and the upper end of the pipe being adapted to be connected to a source of oxygen under pressure, and a water pipe encircling the oxygen pipe and spaced therefrom and from said tube to divide said cooling chamber into concentric vertical water passages communicating within the nozzle, the tube adjacent the upper end of said lower portion being enlarged relative to the References Cited UNITED STATES PATENTS 3,239,205 3/1966 MetZ 266 4 X 3,338,570 8/1967 Zimmer 26634 X FOREIGN PATENTS 60,387 4/19

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
US625740A 1967-03-24 1967-03-24 Oxygen lance Expired - Lifetime US3531097A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62574067A 1967-03-24 1967-03-24

Publications (1)

Publication Number Publication Date
US3531097A true US3531097A (en) 1970-09-29

Family

ID=24507370

Family Applications (1)

Application Number Title Priority Date Filing Date
US625740A Expired - Lifetime US3531097A (en) 1967-03-24 1967-03-24 Oxygen lance

Country Status (5)

Country Link
US (1) US3531097A (en:Method)
BE (1) BE712251A (en:Method)
ES (1) ES351279A1 (en:Method)
FR (1) FR1554545A (en:Method)
GB (1) GB1163705A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052005A (en) * 1976-03-11 1977-10-04 Berry Metal Company Oxygen lance nozzle
CN101736118B (zh) * 2008-11-18 2011-09-07 中冶天工建设有限公司 炼钢转炉氧枪轨道梁安装方法
CN111485058A (zh) * 2020-06-15 2020-08-04 金鼎重工有限公司 一种机械外置式氧枪防坠落装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH60387A (de) * 1912-04-09 1913-07-16 Baechtold Strobel Adolf Brenner mit Wasserkühlung für autogenes Schweißen und Schmelzen von Metallen
FR1212695A (fr) * 1958-01-09 1960-03-25 Thyssen Huette Ag Procédé d'affinage au vent par en haut
US3239205A (en) * 1960-02-19 1966-03-08 A R B E D Acieries Reunies De Double lances
US3338570A (en) * 1963-10-23 1967-08-29 Zimmer Karl-Otto Oxygen lance with a centrally located orifice

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH60387A (de) * 1912-04-09 1913-07-16 Baechtold Strobel Adolf Brenner mit Wasserkühlung für autogenes Schweißen und Schmelzen von Metallen
FR1212695A (fr) * 1958-01-09 1960-03-25 Thyssen Huette Ag Procédé d'affinage au vent par en haut
US3239205A (en) * 1960-02-19 1966-03-08 A R B E D Acieries Reunies De Double lances
US3338570A (en) * 1963-10-23 1967-08-29 Zimmer Karl-Otto Oxygen lance with a centrally located orifice

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052005A (en) * 1976-03-11 1977-10-04 Berry Metal Company Oxygen lance nozzle
CN101736118B (zh) * 2008-11-18 2011-09-07 中冶天工建设有限公司 炼钢转炉氧枪轨道梁安装方法
CN111485058A (zh) * 2020-06-15 2020-08-04 金鼎重工有限公司 一种机械外置式氧枪防坠落装置

Also Published As

Publication number Publication date
GB1163705A (en) 1969-09-10
FR1554545A (en:Method) 1969-01-17
BE712251A (en:Method) 1968-07-15
ES351279A1 (es) 1969-06-01

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