US3606292A - Burner-lance - Google Patents

Burner-lance Download PDF

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Publication number
US3606292A
US3606292A US26897A US3606292DA US3606292A US 3606292 A US3606292 A US 3606292A US 26897 A US26897 A US 26897A US 3606292D A US3606292D A US 3606292DA US 3606292 A US3606292 A US 3606292A
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US
United States
Prior art keywords
burner
lance
conduits
oxygen
nozzle
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
US26897A
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English (en)
Inventor
Meinhard Truppe
Hellmuth Smejkal
Matthias Schernthaner
Gunter Poferl
Johann Hartl
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 US3606292A publication Critical patent/US3606292A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel

Definitions

  • the invention proposes a burner-lance comprising in a cooling jacket a burner insertion including conduits for liquid fuel and a ush gas such as compressed air, a control block at the mouth end of the lance for selectively connecting said conduits to the nozzle outlet, and a steam pipe surrounding said conduits to keep the system warm, an annular canal for the suppply of the oxygen containing gas being formed between said burner insertion and said cooling jacket.
  • This burner-lance is destined for heating or melting down a solid metal charge and when pure oxygen is used it is particularly well suited for refining.
  • the burner-lance according to the invention meets high safety standards. Operation is readily started and terminated and choking of the nozzle parts is avoided.
  • the invention relates to a burner-lance comprising a burner insertion including conduits for liquid fuel and an oxygen containing gas, in particular pure oxygen, and a cooling jacket consisting of concentrical tubes surrounding said burner insertion.
  • Burner-lances of this kind are used in metallurgical furnaces, particularly in open-hearth-furnaces and basic-oxygen converters for heating or melting down a solid metal charge. Burner-lances are exposed to high mechanical and thermal stresses. With a melt weight of e.g. 300 mt. and a throughput of up to about 500 kg. fuel oil/min. and 1000 Nm.3 1 of pure oxygen/min., these lances may be up to 20 rn. long and up to 500 mm. thick.
  • Burner-lances have to be movable, i.e. displaceable in vertical direction; they have to meet high safety standards. It is necessary to provide for a tube between the supply conduit for the liquid fuel and the supply conduit for the oxygen so that in case the fuel conduit leaks an immediate mixture between oxygen and fuel is prevented and the danger of an explosion is eliminated. Since burner-lances as a rule are only intermittently in operation it is a further requirement that they may quickly be made ready for operation and stopped.
  • the invention is aimed at avoiding these disadvantages and difiiculties by creating a burner-lance which meets high safety standards for liquid fuel, particularly fuel oil, and oxygen-containing gas, particularly pure oxygen, in which the fuel and the Oxygen are each conveyed separately to the nozzle mouth, mixed outside the burnerlance and burnt.
  • This aim is achieved with a burner-lance of the kind described in the introduction in that the burner insertion is provided with a control block in the vicinity of the mouth of the lance for reversibly connecting the conduits of the burner insertion, and in that all conduits of the burner insertion are surrounded by a steam pipe, an annular canal for the supply of oxygen containing gas being formed between the burner insertion and the cooling jacket.
  • control block is provided with at least one reversing slide for liquid fuels and a flush gas, e.g. compressed air, and with a plurality of bores for liquid fuels, ush gas, oxygen containing gas, in particular pure oxygen, and cooling water.
  • a flush gas e.g. compressed air
  • the reversing slide may be operated pneumatically or hydraulically.
  • the slide piston is provided with a throttle bore through which the control medium may escape in cases of operation disturbances so that the readjusting spring will move the slide piston and automatically close the fuel supply.
  • a reflux conduit for steam and condensed water is provided within the heated steam tube, the bottom end of said reiiux conduit reaching into a closed bore arranged within the control block.
  • this reflux conduit the condensed water is continuously drained olf.
  • the upper part of the control block is in Contact with the steam and is heated by it as are the conduits in the burner insertion.
  • the nozzle part at the mouth of the lance is releasably connected with the control block.
  • This nozzle part may be cooled With water and provided with a separate water supply and drain comprising a 'bafe element.
  • FIG. l is a vertical sectional view of the bottom part of the burner-lance according to the invention
  • FIG. 2 is a horizontal sectional view along the line II-II of FIG. 1
  • FIG. 3 is a vertical sectional view along the line III-III of PIG. 2.
  • FIGS. 4, '5 and 6 are analogous representations of another embodiment
  • FIG. 5 is a horizontal sectional view along the line V--V of FIG. 4
  • FIG. ⁇ 6 is a vertical sectional view along the line VI-VI of FIG. 5.
  • the burner insertion 1 (FIG. l) or 1' (FIG. 4) is surrounded by a cooling jacket 2 (or 2') and releasably connected with it by means of bayonet locks 40.
  • An annular canal 8 for the supply of oxygen is formed between the burner insertion and the cooling jacket.
  • the cooling jacket 2 (2') comprises the inner water tube 4, the outer water tube 5 which tubes are connected with each other by the nozzle tip 3 (or 3'), and an intermediate water tube ⁇ 6 with a baffle element 7 for guiding the water.
  • the burner insertion 1 (1') comprises a steam tube 9 which is rigidly connected at its bottom end with a control block or control valve 10 (10') and a number of conduits.
  • a reversing slide 11 is provided in the control block 10 (10') which slide connects the conduits for fuel oil and a ush medium, e.g. compressed air or steam.
  • the slide piston 12 is urged downward by compressed air or compressed water impinging from above and is moved into the starting position shown in FIG. 1 by means of a pre-stressed readjusting spring after the pressure is compensated, i.e. the conduit 27 :for the supply of the control medium is relieved of pressure.
  • the slide piston 12 is provided with three sealing faces 13, 14, 15 which co-act with the slide housing 16.
  • the slide housing is connected with the cylinder 17 which is provided with a screwing 18 having a bore 19 for the supply of the control medium.
  • a throttle bore 21 is provided at the bottom end of the slide piston 12 through which throttle bore in case of disturbances-eg. when owing to a break down of the current supply the electromagnetic valves for relieving the control medium conduit 27 cannot be operated-the control medium may escape via the bore 29 (FIG. 3) and the relief conduit 28 so that the readjusting spring 20 will actuate the slide piston 12, and the fuel outlet be automatically closed.
  • conduits 25 for the supply of flush air or Hush steam, conduits 32, 33 for the supply of cooling 'water to the nozzle part 36 and a steam reflux conduit 301 for steam and condensed water are arranged and connected with the control block 10 (10') conduits 25 for the supply of flush air or Hush steam, conduits 32, 33 for the supply of cooling 'water to the nozzle part 36 and a steam reflux conduit 301 for steam and condensed water.
  • the bottom end of the conduit 30 reaches into the closed bore 31 so that the condensed water may continuously be drawn off and a good heat transfer is maintained in the area of the control block 10i (10').
  • Nozzle part 36 is screwed into the bottom end of the control block 10 which nozzle part is provided with guiding surfaces 38 and an exit opening 37 for oil or flush medium, respectively. Together with the nozzle tip 3 the nozzle part 36 forms an annular outlet canal 47 for the oxygen, the flow direction of which is indicated in FIGS. 1 and 4 by arrows.
  • the nozzle part 36 is water-cooled; the ba'le element for the cooling water is designated by numeral 39.
  • two nozzle parts 43, 44 are provided between which an annular outlet canal 46 for oil or the ush medium, respectively, is provided.
  • this nozzle the oxygen leaves from the outer annular canal 8 through slits 45 whose axes cross with the axis of the burner-lance, and from the inner bore 42; thus the oxygen is guided in two separate conduits to the nozzle tip 3'.
  • the supply conduit for the oxygen leaving from the center is designated with numeral 41.
  • the nozzle parts 43 and/or 44 may, on principle, be water cooled and also for the nozzle 4 according to FIG. 1 an internal oxygen supply may bc provided.
  • the slide piston 12 has the starting position shown in FIG. l, i.e. the oil supply through the bore 23 is interrupted owing to the sealing faces 13, 14, and the flush medium may leave the bore 26 (FIG. 3) between the sealing faces 14, 15 into the canal 24, and, via the guiding surfaces 38, and the opening 37, into the open.
  • the burner-lance according to the invention has proved to be highly satisfactory for heating and melting down solid charges in basic-oxygen converters. There are no delays when the oil supply is started or terminated, the nozzle parts do not incrustate and there are no fume puffs or explosions owing to after-running oil.
  • Burner-lances according to FIG. 4 are particularly Well suited for melting and rening a metallic charge.
  • a burner-lance comprising a burner insertion dening a number of conduits including ducts for directing liquid fuel and an oxygen containing gas to a nozzle mouth formed on one end of said burner-lance, and a cooling jacket composed of concentrical tubes surrounding said burner insertion, and further comprising a control block in said burner insertion near the mouth end of the burner-lance for reversi-bly connecting individual conduits of said burner insertion, and a steam pipe surrounding all conduits of said burner insertion, an annular canal for the supply of the oxygen containing gas being formed between said burner insertion and said cooling jacket.
  • a burner-lance comprising an outer jacket composed of concentrical tubes and having connections for circulation of a coolant therethrough, a burner insertion arranged coaxially within said jacket and comprising a set of conduits for operating media including a liquid fuel and a flush gas; a steam pipe enclosing said set of conduits; and a nozzle portion having at least one outlet for at least one of said operating media, an annular duct for the supply of oxygen-containing gas between said burner insertion and said outer jacket, and a control block interposed between said set of conduits and said nozzle portion, said control block comprising a number of bores for said operating media and at least one reversing slide operable to selectively connect said conduits for liquid fuel and flush gas to said outlet.
  • said reversing slide comprises a piston operable by a pressure fluid against the action of a pre-stressed readjusting spring, said piston comprising a throttle bore for draining said pressure fluid in case of operational disturbances so that said spring will urge said piston to a position wherein the fuel supply is closed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Spray-Type Burners (AREA)
US26897A 1969-04-18 1970-04-09 Burner-lance Expired - Lifetime US3606292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT375569A AT287756B (de) 1969-04-18 1969-04-18 Brennerlanze

Publications (1)

Publication Number Publication Date
US3606292A true US3606292A (en) 1971-09-20

Family

ID=3554965

Family Applications (1)

Application Number Title Priority Date Filing Date
US26897A Expired - Lifetime US3606292A (en) 1969-04-18 1970-04-09 Burner-lance

Country Status (10)

Country Link
US (1) US3606292A (fr)
JP (1) JPS496407B1 (fr)
AT (1) AT287756B (fr)
BE (1) BE748913A (fr)
CA (1) CA918917A (fr)
DE (1) DE2013145C3 (fr)
FI (1) FI51869C (fr)
FR (1) FR2043409A5 (fr)
GB (1) GB1299230A (fr)
SE (1) SE375792B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003342A1 (fr) * 1980-05-15 1981-11-26 R Rose Procede et four metallurgique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2001425A (en) * 1977-07-21 1979-01-31 Northern Eng Ind Burner assembly
DE3301466C1 (de) * 1983-01-18 1984-04-12 Korf & Fuchs Systemtechnik GmbH, 7601 Willstätt Brenner bzw. Blasduese fuer den Einsatz in einem metallurgischen Ofen und Anordnung in der Wand eines solchen Ofens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003342A1 (fr) * 1980-05-15 1981-11-26 R Rose Procede et four metallurgique

Also Published As

Publication number Publication date
FI51869C (fi) 1977-04-12
AT287756B (de) 1971-02-10
DE2013145C3 (de) 1978-12-21
JPS496407B1 (fr) 1974-02-14
DE2013145B2 (de) 1978-05-03
GB1299230A (en) 1972-12-13
BE748913A (fr) 1970-09-16
SE375792B (fr) 1975-04-28
FI51869B (fr) 1976-12-31
DE2013145A1 (fr) 1970-10-22
FR2043409A5 (fr) 1971-02-12
CA918917A (en) 1973-01-16

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