EP0363246B1 - Vorrichtung zum Anbringen und Entfernen eines Plasmabrenners in einen Apparat, der unter einem solchen Druck und einer solchen Temperatur arbeitet, dass direktes Arbeiten unmöglich ist - Google Patents

Vorrichtung zum Anbringen und Entfernen eines Plasmabrenners in einen Apparat, der unter einem solchen Druck und einer solchen Temperatur arbeitet, dass direktes Arbeiten unmöglich ist Download PDF

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Publication number
EP0363246B1
EP0363246B1 EP89402600A EP89402600A EP0363246B1 EP 0363246 B1 EP0363246 B1 EP 0363246B1 EP 89402600 A EP89402600 A EP 89402600A EP 89402600 A EP89402600 A EP 89402600A EP 0363246 B1 EP0363246 B1 EP 0363246B1
Authority
EP
European Patent Office
Prior art keywords
torch
shutter
pressure
volume
tubular member
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
EP89402600A
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English (en)
French (fr)
Other versions
EP0363246A1 (de
Inventor
Jean Feuillerat
Yves Hervé Guillaume Valy
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.)
Airbus Group SAS
Original Assignee
Airbus Group SAS
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Filing date
Publication date
Application filed by Airbus Group SAS filed Critical Airbus Group SAS
Publication of EP0363246A1 publication Critical patent/EP0363246A1/de
Application granted granted Critical
Publication of EP0363246B1 publication Critical patent/EP0363246B1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/002—Heated electrically (plasma)

Definitions

  • the present invention relates to a method and a device for placing and removing a plasma torch on an installation operating under high pressure and temperature conditions.
  • Plasma torches of the non-transferred arc type, are used in a certain number of installations or apparatuses, the operation of which involves pressures and temperatures which prohibit any direct intervention for the removal of the torch or its setting up .
  • the placement or removal of the plasma torch requires a change in the operating regime of the installation or of the apparatus, in particular a momentary reduction in the pressure and possibly working temperature conditions which are detrimental. in every way.
  • blast furnaces As a typical example of an installation in which plasma torches are used, mention may be made of blast furnaces and it is in this application that the invention will be described.
  • Plasma torches are used on blast furnaces to overheat the hot wind from the cowper before it is injected into the device.
  • the injection of the hot wind is carried out by means of a conduit, or nozzle, to which is connected by one end an inclined cuff, for example as described in FR-A-2,566,802 of the applicant, and the nose of the torch is inserted into the opposite end of this cuff.
  • This cuff should be as short as possible to reduce heat loss.
  • the wind flow in the nozzle must be reduced to a sufficiently low pressure, of the order of about 400 mb or less and, due to the temperature and the slight flow of hot gas, the operation s 'performs under difficult conditions, and results in production losses proportional to the duration of the change of regime of the blast furnace.
  • a volume of the nozzle was isolated by means of two valves disposed respectively upstream and downstream of the cuff receiving the nose of the torch, thus making it possible to bring this volume to atmospheric pressure to perform the necessary operations.
  • a valve was inserted on a longer cuff, immediately downstream from the nose of the torch, thus making it possible to use a valve of smaller dimensions than the previous ones, but requiring to lengthen the cuff, which increases heat losses at the connection interface and changes the mixing conditions.
  • valve as well as the refractory of the cuff are partly exposed to the thermal flow of the plasma, thus requiring it to be cooled effectively by means of expensive devices.
  • a short cuff having just the length of the nose of the torch was produced and a valve was inserted in the middle of its length.
  • the valve operates in poor conditions with regard to the ⁇ P, which results in deformations that hinder its operation, and leaks.
  • this arrangement prevents the valve from being closed when the torch is in place and hot gas leaks when the torch is removed, before the valve closes.
  • the invention also relates to a device for implementing the method defined above, characterized in that it comprises, upstream of the valve, an expandable and retractable tubular member fixed in leaktight manner at one end, around the end of the cuff adapted to receive the nose of the torch and by its other end around this nose, means for balancing the pressure in said member with that prevailing downstream of the valve, and means for cooling said tubular member.
  • said annular member is fixed around the nose of the torch in a removable manner, additional sealing means being provided on said member and on the torch as well as means for mutual locking of said member on the torch.
  • said means for balancing the pressure in said member with that downstream of the valve comprises a conduit connecting the interior of said member to a source of compressed air by means of a pressure reducer- pilot connected to the downstream side of the valve by a tap.
  • Figure 1 is a schematic sectional view showing a known arrangement of a plasma torch on a cuff secured to a nozzle for injecting hot wind into a blast furnace.
  • Figure 2 is a view similar to that of Figure 1, showing the device according to the invention.
  • Figures 3 and 4 are schematic sectional views showing the operation of the device of Figure 1.
  • Figure 5 is a view of a variant.
  • Figure 6 is a view of another variant.
  • Figure 1 a diagram of a known arrangement in which the reference 1 designates a hot wind injection nozzle in a blast furnace, comprising a wind inlet 2 and an inclined sleeve 3 for the connection of a plasma torch 4, of the non-transferred arc type, this sleeve being provided with a shut-off valve 5 situated approximately in the middle of its length.
  • valve operates in poor ⁇ P conditions, which have caused deformations of the valve shutter, resulting in difficulties in operating the valve, leaks and leaks.
  • FIG. 2 shows the device according to the invention for implementing the method defined above.
  • This device can be adapted to the arrangement of FIG. 1, practically without modification.
  • This tubular member 6 may consist for example of metallic annular elements mounted to slide one inside the other in a telescopic and sealed manner, as known per se.
  • the tubular member 6 is provided with a sealing collar 8 having in section a suitable shape for fitting tightly around a complementary sealing part 9 of the end of the torch 4 .
  • At least one guide rod 10 is provided fixed parallel to the axis of the cuff 3 and on which the flange 8 of the tubular member 6 can slide, as well as a flange 11 of the torch, set back from his nose 12.
  • the device also comprises at least one locking member 13 articulated on the edge of the flange 8 so as to be able to come into engagement with the flange 11 of the torch in order to maintain the latter in sealed contact with the flange; at least one other similar locking member 14 is articulated on the cuff 3 and adapted to cooperate outside the tubular member with the flange 11 of the torch, in order to retain the latter in the operating position, as is will describe below.
  • conduit 15 connecting the interior of the tubular member 6 to the atmosphere via a tap 17, and another conduit 18 connecting the interior of the member 6 to a source of compressed air S by means of a tap 19 and of a pilot regulator 20 which is itself connected to the interior of the nozzle 1 by a duct 21 and a tap 22.
  • FIG. 2 shows the torch 4 in the non-use position, in which the valve 5 is closed and the torch remote from the flange 8.
  • valves 17, 19 and 22 are closed and the torch is made to slide on the guide 10 to bring the part 9 in tight contact with the flange 8 of the tubular member 6 and locks them together by means of the locking member 13, as shown in FIG. 3.
  • the tubular member 6 delimits between the nose of the torch and the cuff 3 a sealed enclosure or airlock 16 of variable volume, closed at one of its ends by the nose of the torch 4 and at its opposite end by valve 5, closed.
  • valves 19 and 22 are then opened in order to bring the airlock 16 to a pressure equal to that of the nozzle, or of the cuff downstream of the valve 5, by means of the pilot holder 20.
  • the valve When the pressures are equalized, the valve is opened and the torch is advanced, thereby reducing at the same time the volume of the airlock 16, which is retracted, by simultaneously using the plasma gas from torch 4, without striking the arc electric and thus brings its nose to a station in contact with the periphery of the opening of the cuff 3.
  • the torch is then locked in position by means of the locking member 14 on the flange 11, and the valve 17 is opened on the atmosphere so as to cool the interior of the airlock with air from the source S under a pressure controlled by the regulator-pilot 20 and approximately equal to that prevailing downstream of the valve 5.
  • tubular member 6 is made of metal, for example stainless steel, in several elements sliding one inside the other as known per se.
  • the annular member 23 is made of rubber, or other reinforced elastomer, for example a bellows brand "VIBROFIX” marketed by the company SNRI, all the other elements are similar to those of the first mode of achievement.
  • the annular member 24 is mounted on a cuff 25 located behind the inlet 26 of hot wind and in the axis of the nozzle 27.
  • the entire device is also identical in all respects to the previous example, either with a telescopic metal airlock or with an elastomer bellows.
  • conduit 28 connecting the regulator 20 to the nozzle opens into the latter further downstream of the inlet 26 of hot wind ( Figure 6).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Plasma Technology (AREA)
  • Manufacture Of Iron (AREA)
  • Gas Burners (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Arc Welding In General (AREA)

Claims (8)

  1. Verfahren zum Anbringen und Entfernen eines Plasmabrenners mit nicht übertragenem Lichtbogen an einem Ende eines mit einem Schieber versehenen Stutzens, wobei der Plasmabrenner mit einer Düse eines unter erhöhten Temperaturen und erhöhten Drücken arbeitetenden Gerätes kommuniziert, dadurch gekennzeichnet, daß zur Einnahme der Betriebsstellung
    a) ein geschlossener veränderlicher Hohlraum vor dem Schieber zwischen diesem und dem Ende des Brenners hergestellt wird,
    b) der Druck in diesem Hohlraum mit dem vor dem Schieber herrschenden Druck ausgeglichen wird,
    c) der Schieber geöffnet wird,
    d) dieser Hohlraum mit Hilfe des Schiebers durch Vorschieben des Brennermundstücks in die Betriebsstellung verkleinert wird, und daß zum Entfernen des Brenners
    e) der Hohlraum durch Rückziehen des Brennermundstücks vergrößert wird,
    f) der Schieber geschlossen wird,
    g) der Hohlraum auf atmosphärischen Druck, der niedriger als der hinter dem Schieber bestehene Druck ist, reduziert wird,
    h) der Hohlraum geöffnet wird.
  2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß sie vor dem Schieber (5) mit einem ausziehbaren und wieder zusammenschiebbaren rohrförmigen Organ (6) versehen ist, das am einen Ende um das Ende (7) des Stutzens (3) dicht befestigt ist, indem dieses Ende (7) zur Aufnahme des Mundstücks (12) des Brenners (4) angepaßt ist, und am anderen Ende um das Mundstück herum Mittel (19, 20, 22, S) vorgesehen sind zur Herstellung des Ausgleichs des in diesem Organ (6) herrschenden Druckes mit dem hinter dem Schieber (5) vorhandenen Druck, sowie Mittel (17, 19, 20, 22, S) zur Kühlung des rohrförmigen Organs (6).
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das rohrförmige Organ (6) beweglich um das Mundstück des Brenners (4) herum angeordnet ist und hierzu sich ergänzende Abdichtmittel (8, 11) am Organ (6) und am Brenner (4), sowie Mittel (13) zur gegenseitigen Verriegelung/Absperrung dieses Elementes am Brenner aufweist.
  4. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die genannten Mittel zum Ausgleich des Druckes im Organ (6) mit dem Druck hinter dem Schieber (5) eine Leitung (18) aufweisen, die das Innere des Organs (6) über einen Vorsteuerdruckminderer (20), der hinter dem Schieber (5) über einen Hahn (22) angeschlossen ist, mit einer Druckluftquelle (S) verbindet.
  5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Abdichtelement (7) am Ende des Stutzens (3) als Vorsprung in das Innere des rohrförmigen Organs (6) hinein ragt.
  6. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß das rohrförmige Organ (6, 24) aus Metallelementen besteht, die teleskopartig ineinander verschiebbar sind.
  7. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß das ringförmige Organ (23) eine Manschette aus verstärktem Elastomer ist.
  8. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß sie an einem mit der Achse der Düse (27) fluchtenden Stutzen (25) angebracht ist.
EP89402600A 1988-10-03 1989-09-22 Vorrichtung zum Anbringen und Entfernen eines Plasmabrenners in einen Apparat, der unter einem solchen Druck und einer solchen Temperatur arbeitet, dass direktes Arbeiten unmöglich ist Expired - Lifetime EP0363246B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8812899 1988-10-03
FR8812899A FR2637443B1 (fr) 1988-10-03 1988-10-03 Procede et dispositif pour la mise a poste et le retrait d'une torche a plasma sur un appareil fonctionnant dans des conditions de pression et de temperature interdisant une intervention directe

Publications (2)

Publication Number Publication Date
EP0363246A1 EP0363246A1 (de) 1990-04-11
EP0363246B1 true EP0363246B1 (de) 1993-05-05

Family

ID=9370622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402600A Expired - Lifetime EP0363246B1 (de) 1988-10-03 1989-09-22 Vorrichtung zum Anbringen und Entfernen eines Plasmabrenners in einen Apparat, der unter einem solchen Druck und einer solchen Temperatur arbeitet, dass direktes Arbeiten unmöglich ist

Country Status (7)

Country Link
US (1) US4997475A (de)
EP (1) EP0363246B1 (de)
JP (1) JPH0665195B2 (de)
CA (1) CA1310075C (de)
DE (1) DE68906347T2 (de)
ES (1) ES2039902T3 (de)
FR (1) FR2637443B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU88280A1 (fr) * 1993-05-27 1994-12-01 Wurth Paul Sa Dispositif pour introduire une lance dans un réservoir sous pression, notamment un haut fourneau
US9599333B2 (en) 2013-11-08 2017-03-21 Air Products And Chemicals, Inc. Burner retraction system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB303510A (en) * 1928-01-06 1929-12-05 Thery Rene Improvements in or relating to furnaces heated by oil burners
US2924269A (en) * 1956-10-01 1960-02-09 United States Steel Corp Blast furnace stove gas-port and burner nozzle connection
GB1231684A (de) * 1968-04-30 1971-05-12
US4477248A (en) * 1983-08-04 1984-10-16 Dulac Robert R Oil burner shutter
FR2566802B1 (fr) * 1984-07-02 1986-12-05 Aerospatiale Procede pour le rechauffage du gaz de soufflage d'un haut fourneau par un generateur de plasma
SE451756B (sv) * 1984-10-19 1987-10-26 Skf Steel Eng Ab Plasmageneratorinstallation i schaktugn
US4769065A (en) * 1987-05-08 1988-09-06 Electric Power Research Institute Control of a plasma fired cupola

Also Published As

Publication number Publication date
JPH02168596A (ja) 1990-06-28
US4997475A (en) 1991-03-05
DE68906347T2 (de) 1993-08-12
FR2637443B1 (fr) 1990-11-02
JPH0665195B2 (ja) 1994-08-22
DE68906347D1 (de) 1993-06-09
CA1310075C (fr) 1992-11-10
ES2039902T3 (es) 1993-10-01
EP0363246A1 (de) 1990-04-11
FR2637443A1 (fr) 1990-04-06

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