US3291471A - Blowing lance for carrying out top-blowing processes - Google Patents

Blowing lance for carrying out top-blowing processes Download PDF

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Publication number
US3291471A
US3291471A US329117A US32911763A US3291471A US 3291471 A US3291471 A US 3291471A US 329117 A US329117 A US 329117A US 32911763 A US32911763 A US 32911763A US 3291471 A US3291471 A US 3291471A
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US
United States
Prior art keywords
blowing
insert member
lance
carrying
inner tube
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
US329117A
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English (en)
Inventor
Heyer Klaus
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.)
Voestalpine AG
Voest AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Application granted granted Critical
Publication of US3291471A publication Critical patent/US3291471A/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
    • C21C5/462—Means for handling, e.g. adjusting, changing, coupling
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/44—Hair-drying helmets whereon the ventilating means and the heating means are apart from the helmet
    • 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

  • This invention relates to a blowing lance for the pneumatic refining of crude iron, wherein a suspension of finegrained basic admixtures, such as lime, in a gaseous oxygen-containing blowing medium is blown onto the molten charge.
  • Refining processes of the mentioned kind which are often designated by the short name LD-AG processes, have been developed for refining high-phosphorus crude irons. They enable the rapid formation of a reactive slag and the preferential dephosphorization before the decarbonization.
  • Blowing lances have already been proposed which consist of two concentric tubes, the outer tube carrying the oxygen-containing blowing medium and the inner tube carrying a suspension of the finely divided solid substances in the blowing medium, so that the mixing of the two media is effected upon their expansion beyond the nozzle mouth. Since the supply conduits for the suspension are subjected to a very heavy wear, special measures have had to be taken for the introduction of the suspension into the inner tube. It has been proposed, for instance, to connect the inner tube directly with the lime supply container and to make the outer tube, which terminates in a nozzle, telescopically displaceable and glidable relative to the inner tube. It has also been proposed to feed the suspension into the inner tube through an elbow tube.
  • elbow tubes have not proved satisfactory.
  • the radius of curvature of the elbow tube has to be large. This entails the undesirable result that the distance between the lance joined to the elbow tube and the operating platform is very large.
  • the operation of the lance is rendered more diflicult.
  • Replacement of the elbow tube is timeconsuming and requires additional installations because of the heavy weight thereof.
  • the invention has in view that the inner tube which feeds the suspension is perfectly sealed against the outside atmosphere and against the oxygen-feeding outer tube, that the distance between the lance and the edge of the operating platform is small, and that the replacement of the component parts of the lance can be effected in a simple and time-saving manner and at low cost.
  • a blowing lance comprising two concentric tubes in such manner that the head of the blowing lance is designed as a gastight housing in which an insert member made of wearresisting material is replaceably inserted, said insert member having a curved bore which connects the supply con- 3,291,471 Patented Dec. 13, 1966 ice duit for the suspension with the central inner tube.
  • the insert member has a cylindrical shape and is pressed against the bottom of the housing by a spring element which is arranged between the insert member and the removable cover of the housing.
  • connection of the bore in the insert member with the central inner tube may be effected by means of a seat portion of conical shape, which is fitted into the bottom of the housing.
  • the diameter of the bore through the seat portion is reduced to the diameter of the inner tube.
  • the water-cooled blowing lance 1 which is adapted to be lifted and lowered, consists in its upper part, which is of particular concern for the invention, of the outer tube 2 and the inner tube 3.
  • the outer tube 2 is connected to the oxygen conduit 4.
  • the head of the blowing lance is formed by a gas-tight housing 5 consisting of the bottom 6, the shell 7 and the cover 8, the supply conduit 9 for the suspension being laterally welded into the shell 7.
  • the cover 8 of the housing is removably secured by means of screws to the shell 7 of the housing.
  • an insert member 10 of cylindrical shape is inserted into the housing, which insert member has a curved bore 11 and connects the supply conduit 9 through the seat portion 12 fitted into the bottom 6 of the housing with the inner tube 3.
  • the seat portion 12 has a conical shape. There, the inside diameter of the bore 11 is reduced to the inside diameter of the inner tube 3.
  • Numeral 13 designates packings which render the housing gas-tight.
  • Numeral 14 denotes a spring element which is inserted between the cover 8 and the insert member 10 whereby the insert member 10 is pressed against the bottom of the housing.
  • the insert member is made of non-abrasive material.
  • the curved bore has the task to deflect the suspension into the inner tube 3 Within a minimum of space. Thus, the distance between the lance and the operating platform is kept small.
  • the construction according to the invention has, above all, the advantage that the insert member does not require particular accuracy of working.
  • the sealing is effected by the gas-and pressure-tight housing, any inaccuracies of working will only cause the existing gaps to be filled entirely with lime dust which does not cause any adverse effects on the lime dust supply.
  • Replacement of the insert member is easily feasible by detaching the cover of the housing, without having to lift heavy parts.
  • the housing and the insert member may be provided with a guide which prevents the insert member from being turned during operation or from being inserted in a wrong angular position.
  • a blowing lance for carrying out top-blowing processes comprising two concentrically arranged tubes, the outer of said tubes being connected to a blowing gas supply conduit and the central inner tube being connected to a supply conduit carrying a suspension of finely divided solid substances in a blowing-gas, the head of the blowing lance being designated to form a gas-tight housing in which an insert member made of wear-resisting material is replaceably inserted, said insert member having a curved bore which connects said suspension supply conduit with said central inner tube.
  • a blowing lance for carrying out top-blowing processes comprising two concentrically arranged tubes, the outer of said tubes being connected to a blowing gas supply conduit and the central inner tube being connected to a supply conduit carrying a suspension of finely divided solid substances in a blowing gas, the head of the blowing lance forming a gas-tight housing comprising a substantially cylindical shell having an inlet connected to said suspension supply conduit, a bottom part having an outlet connected to said central inner tube, and a removable cover, an insert member made of wear-resisting material and having a curved bore therein being replaceably arranged in said housing in such manner that one end of said bore is aligned with said inlet and the other end of said bore is aligned with said outlet.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US329117A 1962-12-14 1963-12-09 Blowing lance for carrying out top-blowing processes Expired - Lifetime US3291471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT979962A AT238746B (de) 1962-12-14 1962-12-14 Blaslanze zur Durchführung von Aufblaseverfahren

Publications (1)

Publication Number Publication Date
US3291471A true US3291471A (en) 1966-12-13

Family

ID=3617375

Family Applications (1)

Application Number Title Priority Date Filing Date
US329117A Expired - Lifetime US3291471A (en) 1962-12-14 1963-12-09 Blowing lance for carrying out top-blowing processes

Country Status (5)

Country Link
US (1) US3291471A (2)
AT (1) AT238746B (2)
BE (1) BE641198A (2)
GB (1) GB1007402A (2)
LU (1) LU44964A1 (2)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387838A (en) * 1965-10-22 1968-06-11 Koppers Co Inc Lance apparatus for treating molten metals
US3521872A (en) * 1966-04-13 1970-07-28 Noranda Mines Ltd Apparatus for controlling the temperature of metal lances in molten baths
US5090622A (en) * 1990-02-01 1992-02-25 Voest-Alpine Industrieanlagenbau G.M.B.H. Arrangement for supplying media to a blowing lance
DE4240666C1 (en) * 1992-11-24 1993-07-15 Mannesmann Ag, 4000 Duesseldorf, De Installation for holding and supplying blow lance for metallurgical vessel - with automatic positioning and clamping of lance in carrier structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1153684A (en) * 1914-12-04 1915-09-14 Lorne A Griffin Suction-machine for conduits conveying loose, abrasive, and disinte grated materials.
US2508874A (en) * 1946-02-09 1950-05-23 American Wheelabrator & Equipm Casting screw threads on blast nozzles and the like
US3166621A (en) * 1961-03-16 1965-01-19 Colorado Fuel & Iron Corp Burner tuyere arrangement for a blast furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1153684A (en) * 1914-12-04 1915-09-14 Lorne A Griffin Suction-machine for conduits conveying loose, abrasive, and disinte grated materials.
US2508874A (en) * 1946-02-09 1950-05-23 American Wheelabrator & Equipm Casting screw threads on blast nozzles and the like
US3166621A (en) * 1961-03-16 1965-01-19 Colorado Fuel & Iron Corp Burner tuyere arrangement for a blast furnace

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387838A (en) * 1965-10-22 1968-06-11 Koppers Co Inc Lance apparatus for treating molten metals
US3521872A (en) * 1966-04-13 1970-07-28 Noranda Mines Ltd Apparatus for controlling the temperature of metal lances in molten baths
US5090622A (en) * 1990-02-01 1992-02-25 Voest-Alpine Industrieanlagenbau G.M.B.H. Arrangement for supplying media to a blowing lance
EP0441767A3 (en) * 1990-02-01 1992-03-25 Voest-Alpine Industrieanlagenbau Gesellschaft M.B.H. An arrangement for supplying media to a blowing lance
DE4240666C1 (en) * 1992-11-24 1993-07-15 Mannesmann Ag, 4000 Duesseldorf, De Installation for holding and supplying blow lance for metallurgical vessel - with automatic positioning and clamping of lance in carrier structure

Also Published As

Publication number Publication date
AT238746B (de) 1965-02-25
LU44964A1 (2) 1964-02-07
BE641198A (2) 1964-04-01
GB1007402A (en) 1965-10-13

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