EP0231137A1 - Aufheizbrenner - Google Patents

Aufheizbrenner Download PDF

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Publication number
EP0231137A1
EP0231137A1 EP87400065A EP87400065A EP0231137A1 EP 0231137 A1 EP0231137 A1 EP 0231137A1 EP 87400065 A EP87400065 A EP 87400065A EP 87400065 A EP87400065 A EP 87400065A EP 0231137 A1 EP0231137 A1 EP 0231137A1
Authority
EP
European Patent Office
Prior art keywords
dome
burner
head
burner according
internal chamber
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Withdrawn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
EP87400065A
Other languages
English (en)
French (fr)
Inventor
Jean-Pierre Aubrun
Lucien Bauvois Bernard
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.)
USINOR Aciers
ERMAT
Original Assignee
USINOR Aciers
ERMAT
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 USINOR Aciers, ERMAT filed Critical USINOR Aciers
Publication of EP0231137A1 publication Critical patent/EP0231137A1/de
Withdrawn legal-status Critical Current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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/76—Protecting flame and burner parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/78—Cooling burner parts

Definitions

  • the present invention relates to a high thermal power burner for carrying at high temperature chambers capable of containing a solidified material and whose liquid mass discharge orifice is vertical, for example vacuum degassing chambers of the type RH.
  • degassing devices which consist of a vertical cylindrical enclosure whose inner wall is lined with high quality refractory materials and which comprises one or two vertical pipes opening into the back wall, the upper part being closed and comprising a tube through which a vacuum is produced.
  • the vertical pipes which open into the bottom of the cylindrical enclosure are intended to be immersed in the liquid metal in order to suck it up and make it penetrate into the degassing enclosure.
  • heating or preheating burners are used which are placed below the lower pipes of the enclosure.
  • These burners are generally formed by a nozzle containing the various fuel mixture supply conduits, as well as a central pilot mixture supply conduit connected to an explosion chamber for igniting the burner.
  • the integration of the ignition system has the effect of increasing the section of the burner head and of decreasing the pulse of the gas jets, so that at the time of the preheating of the enclosure, the molten metal flows on the burner head, closes the outlet orifices and causes them to deteriorate.
  • the present invention therefore relates to a heating or preheating burner which avoids the aforementioned drawbacks and which allows heating by the lower orifices of an enclosure still containing molten material or capable of melting during heating.
  • the subject of the invention is therefore a burner, in particular for heating or preheating chambers, comprising a head provided with feed channels Combustion mixture, characterized in that it comprises on the one hand a protective dome comprising cooling means and on the other hand means for distributing a circular jet of neutral gas or air ventilated under pressure covering the entire surface of the dome to granulate the molten material falling on said dome.
  • the protective dome is of frustoconical shape, the concavity being directed in the direction opposite to the direction of ejection of the burner flame, and comprises in its center a well surrounding the burner head and the diameter of which is greater than the external diameter of said head to provide with it a circular passage communicating with an internal chamber for supplying neutral gas or air ventilated under pressure.
  • the means for distributing the circular jet of neutral gas or air ventilated under pressure are constituted by an ejection nozzle disposed at the upper end of the protective dome.
  • FIG 1 there is shown schematically the lower part of a vacuum degassing device consisting of an enclosure 1 of generally cylindrical shape having a bottom 2. This enclosure is lined along its inner wall with a refractory lining 3 which is made of masonry bricks.
  • the degassing device has two lower tubes 4 and 5 which open at its bottom 2 through the refractory lining 3. These tubes 4 and 5 are made of a refractory material which is suitable for immersing in a bath of contained liquid steel for example in a pocket, not shown, for the purpose of degassing the steel.
  • a burner 10 is placed below each of the pipes 4 and 5 so that the flame is directed towards said pipes and penetrates inside the enclosure for the purpose of '' preheating said enclosure and melting the material accumulated on the refractory lining 3.
  • the two burners 10 are identical and are mounted on a mobile gantry 6 allowing these burners to be positioned below the pipes 4 and 5 of the enclosure 1.
  • the lighting of each of the burners 10 is carried out by an independent and retractable igniter 7 between an ignition position located near the burner head and a raised position after ignition, as shown on the left in Figure 1.
  • This burner 10 is formed by a nozzle 11 for supplying an oxidizing mixture comprising a central duct 12 for supplying gas and an annu duct oxygen supply area 13. These two coaxial conduits 12 and 13 are placed inside a conduit 14 for supplying neutral gas or pressurized ventilated air, the purpose of which will be specified later.
  • the nozzle 11 has at its upper part a crown 15 on which is fixed a circular fixing flange 16 comprising a central body 16a pierced with a central orifice 17 and small orifices 18 uniformly distributed around said central orifice, communicating respectively with the conduit 12 and the pipe 13 of the nozzle 11.
  • a burner head 21 which has a central channel 22 and small peripheral channels 23 uniformly distributed around said central channel 22
  • the central channel 22 and the small peripheral channels 23 communicate via the orifices 17 and 18 of the flange 16 respectively with the conduit 12 and the conduit 13 of the nozzle 11 respectively.
  • the burner head 21 comprising only a central gas supply channel 22 and small peripheral oxygen supply channels 23 therefore has a small section which makes it possible to increase the gas pulse.
  • the protective dome 30 extends upwards near the upper part of the head 21 and, downwards, projects below the fixing flange 16.
  • This dome 30 forms with the head 21 and the fixing flange 16 an internal chamber 24 connected to the duct 14 by orifices 25 drilled in the flange 16 and the crown 15.
  • the dome 30 has at its upper part a central well 31 surrounding the burner head 21 and which has a diameter greater than the external diameter of said head 21 so as to provide therewith a circular passage 26.
  • the burner head 21 is provided with a small circular rim 27 directed downwards and which projects slightly above the upper end of the dome 30.
  • This small rim 27 is housed with the upper end of the dome 30 a small annular space 28 forming an ejection nozzle connected by the passage 26, the internal chamber 24 and the orifices 25, to the duct 14 for supplying neutral gas or air ventilated under pressure.
  • This neutral pressurized gas blown by the nozzle 28 forms a circular jet and a mattress covering the entire outer surface of the dome 30.
  • the dome 30 is constituted by an upper skirt 32 and a lower skirt 33 connected by spacers 34 so as to provide an internal chamber 35 for the circulation of a cooling fluid.
  • FIG. 3 which is a developed view of the frustoconical crown 30, the internal chamber 35 is separated by an intermediate partition 36 into two zones 35a and 35b, the zone 35a being connected to an inlet pipe 37 of the coolant and the zone 35b to a pipe 38 for output of said fluid.
  • baffles 39 to increase the path followed by the fluid and consequently increase the cooling of the dome 30.
  • the burner head 21 and the dome 30 are made, for example, of copper or of refractory steel.
  • the gas pulse at the outlet of said head 21 is large, so that when flowing, the molten material is deflected on the dome 30 and does not reach the head of burner 21 which ensures its protection.
  • the molten material falling on the dome 30 rolls in the form of small beads.
  • This system is suitable for heating through the lower orifices of any enclosure containing molten material or liable to melt during heating, such as for example RH type vacuum coating for steel treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Nozzles (AREA)
EP87400065A 1986-01-14 1987-01-13 Aufheizbrenner Withdrawn EP0231137A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8600427 1986-01-14
FR8600427A FR2592941B1 (fr) 1986-01-14 1986-01-14 Bruleur de prechauffage

Publications (1)

Publication Number Publication Date
EP0231137A1 true EP0231137A1 (de) 1987-08-05

Family

ID=9331084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400065A Withdrawn EP0231137A1 (de) 1986-01-14 1987-01-13 Aufheizbrenner

Country Status (6)

Country Link
EP (1) EP0231137A1 (de)
JP (1) JPS63502691A (de)
KR (1) KR880700861A (de)
BR (1) BR8705375A (de)
FR (1) FR2592941B1 (de)
WO (1) WO1987004189A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101782240A (zh) * 2010-03-12 2010-07-21 苏州宝联重工股份有限公司 烘烤枪的点火喷嘴

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU615534B2 (en) * 1988-04-19 1991-10-03 Teijin Limited 2-substituted-2-cyclopentenones

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78517C (de) * F. GRAF, Aachen Bunsenbrenner mit Wasserkühlung
DE464328C (de) * 1928-08-15 Ludwig Graven Vorrichtung zum Beheizen von Giesspfannen durch Gasfeuerung
EP0014221A1 (de) * 1979-02-03 1980-08-20 G. Kromschröder Aktiengesellschaft Gasbeheizter Brenner zur Antemperung von Schmelzöfen oder Schmelztiegeln

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5562118A (en) * 1978-10-30 1980-05-10 Kawasaki Steel Corp Preheating method for degassing vessel
JPS56126058A (en) * 1980-03-11 1981-10-02 Nippon Steel Corp Preheating method for continuous casting tundish
JPS58185704A (ja) * 1982-04-23 1983-10-29 Nippon Steel Corp 地金除去装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78517C (de) * F. GRAF, Aachen Bunsenbrenner mit Wasserkühlung
DE464328C (de) * 1928-08-15 Ludwig Graven Vorrichtung zum Beheizen von Giesspfannen durch Gasfeuerung
EP0014221A1 (de) * 1979-02-03 1980-08-20 G. Kromschröder Aktiengesellschaft Gasbeheizter Brenner zur Antemperung von Schmelzöfen oder Schmelztiegeln

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 98 (C-18)[580], 15 juillet 1980; & JP-A-55 62 118 (KAWASAKI SEITETSU K.K.) 10-05-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 1 (M-105)[879], 7 janvier 1982; & JP-A-56 126 058 (SHIN NIPPON SEITETSU K.K.) 02-10-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 19 (C-207)[1456], 26 janvier 1984; & JP-A-58 185 704 (SHIN NIPPON SEITETSU K.K.) 29-10-1983 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101782240A (zh) * 2010-03-12 2010-07-21 苏州宝联重工股份有限公司 烘烤枪的点火喷嘴
CN101782240B (zh) * 2010-03-12 2011-08-10 苏州宝联重工股份有限公司 烘烤枪的点火喷嘴

Also Published As

Publication number Publication date
JPS63502691A (ja) 1988-10-06
FR2592941B1 (fr) 1988-05-06
KR880700861A (ko) 1988-04-12
BR8705375A (pt) 1987-12-22
FR2592941A1 (fr) 1987-07-17
WO1987004189A1 (fr) 1987-07-16

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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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Inventor name: AUBRUN JEAN-PIERRE

Inventor name: BAUVOIS BERNARD,LUCIEN