EP0258326B1 - Dispositif de degazage de metaux fondus - Google Patents

Dispositif de degazage de metaux fondus Download PDF

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Publication number
EP0258326B1
EP0258326B1 EP87901324A EP87901324A EP0258326B1 EP 0258326 B1 EP0258326 B1 EP 0258326B1 EP 87901324 A EP87901324 A EP 87901324A EP 87901324 A EP87901324 A EP 87901324A EP 0258326 B1 EP0258326 B1 EP 0258326B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
gas
reactor
hollow
nozzle tip
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
EP87901324A
Other languages
German (de)
English (en)
Other versions
EP0258326A1 (fr
Inventor
Howard A. Mcdonald
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to AT87901324T priority Critical patent/ATE56089T1/de
Publication of EP0258326A1 publication Critical patent/EP0258326A1/fr
Application granted granted Critical
Publication of EP0258326B1 publication Critical patent/EP0258326B1/fr
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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the present invention relates to a nozzle device according to the preamble of patent claim 1.
  • a method and apparatus for degassing molten metal is disclosed in U.S. Patent No. 4,177,066.
  • the invention of this cited patent teaches degassing molten metal using a device consisting of a vortex tank reactor, the molten metal being introduced tangentially into the reactor and the molten metal being fed in a vortex motion from the reactor inlet to the reactor outlet.
  • the metal inlet be arranged with respect to the reactor wall in such a way that the molten metal is fed tangentially into the reactor.
  • the vortex tank reactor comprises a first part which is essentially equipped with a cylindrical side wall, and underneath, under the first, essentially cylindrical side wall part, a second side wall part which narrows downwards.
  • the gas injection nozzles for the purge gas are arranged in the walls of the narrowing side wall part in different positions in order to optimize the bubble distribution of the purge gas through the entire melt during the passage from the reactor inlet to the reactor outlet. Due to the arrangement of the spray nozzles at different heights of the narrowing wall part, these are at different distances from the central axis of the vortex tank reactor, thus achieving a maximum gas bubble distribution.
  • the details of the various parts of the vortex tank reactor and the spray nozzle arrangements as disclosed in U.S. Patent No. 4,177,066 can also be used with the improved gas injector system of the present invention.
  • EP-A-70 799 describes a nozzle device as a purge gas inlet for use in a vortex tank reactor according to the aforementioned US Pat. No. 4,177,066.
  • the gas introduction system comprises a nozzle insert which is securely inserted in the wall of the vortex tank reactor and is flush with the inner reactor wall.
  • the nozzle insert is equipped with a seat surface, which in turn is shaped to match a nozzle tip cone made of ceramic material or the like.
  • the gas inlet nozzle is spring-loaded against this nozzle tip cone and the nozzle tip cone accordingly against the nozzle insert, so that metal penetration from the reactor in the area of the gas inlet nozzle is avoided.
  • the gas inlet nozzle is secured against the purge gas supply by a screw device, using a seal between the nozzle screw part and the purge gas nozzle. It has been found that the rotating movement of the nozzle screw part on the seal between the nozzle screw part and the purge gas nozzle has an adverse effect on their sealing effect. In view of the fact that the vortex tank reactor is intended for the removal of hydrogen and alkaline earth metals from molten aluminum and for this purpose active gases such as chlorine gas or the like are used, it was imperative that a leak-free design of the purge gas supply system was developed.
  • EP-A-169 290 also describes a nozzle device for use in a vortex tank reactor of the type described above.
  • the gas nozzle system comprises a nozzle insert which is attached to the reactor wall of the vortex tank reactor and is flush with the inner wall boundary.
  • the nozzle insert is provided with a receiving surface which is designed to accommodate a nozzle tip cone made of ceramic or similar material.
  • the purging gas nozzle is pressed against the nozzle tip cone with a corresponding force in order to avoid a seal between the tip and the tip cone and thus a metal passage from the reactor in the region of the purging gas nozzles.
  • the purging gas nozzle is secured to the purging gas supply line by a nozzle screw connection which contains a nozzle tip screw which receives the nozzle body.
  • the nozzle tip screw non-rotatably holds a mounting plate that presses against a seal located between the mounting plate and the rear end of the nozzle body.
  • a thread is screwed into the nozzle tip screw and supports the mounting plate against the seal and further against the nozzle body in order to achieve a leak-free seal.
  • a spring washer can be placed between the mounting plate and the thread to help support the mounting plate.
  • the object is achieved by a nozzle device which is characterized by the wording of claim 1.
  • Advantageous further developments of the device according to the invention are characterized by the features of claims 2 and 3.
  • the nozzle device is shown in a preferred arrangement on a vortex tank reactor 10, comprising a first substantially cylindrical side wall part 12 and a second downwardly tapering side wall 14, below the cylindrical side wall part 12.
  • nozzle devices according to the present invention are inserted into each of the vortex tank reactors described in US Pat. No. 4,177,066 and the various embodiments of the vortex tank reactor are also encompassed thereby.
  • a number of nozzle devices are each secured in the tapered side wall part 14 by means of a holding frame 16.
  • the tapered sidewall portion 14 of the vortex tank reactor which has a first inner wall 18 made of suitable refractory material and a second outer wall 20, preferably made of steel, and a distance from the inner wall 18 exhibits.
  • An insulation filling 22 is placed between the space between the inner wall 18 and the outer wall 20.
  • the inner wall 18 is provided with a number of openings 24 which are each intended to receive a nozzle device according to the present invention.
  • a hollow nozzle seat 26 the bore of which has a first narrowing section 28 and a second narrowing section 30, both of which are connected by a shoulder 32.
  • the nozzle seat 26 can be made from any suitable ceramic material.
  • a hollow nozzle tip cone 34 made of a suitable ceramic material is sealingly fitted in the region of the second tapered section 30 of the hollow nozzle seat 26.
  • a nozzle tip seal 36 made of a suitable ceramic material rests and seals against the shoulder 32 of the hollow nozzle seat 26.
  • a shouldered nozzle tip 38 with the cylindrical shoulder part 40 and a tapered tip part 42 is inserted within the hollow nozzle seat 26 such that the tapered one Tip portion 42 fits into the hollow nozzle tip cone 34 to form a first seal against a metal passage.
  • the shoulder portion 40 of the hollow nozzle tip 38 presses the nozzle tip seal 36 against the shoulder in part 32 of the nozzle seat 26 to form a second seal against a metal passage.
  • a gas supply line 44 is pressed into a recess 46 in the hollow, shouldered gas nozzle tip 38, bonded with ceramics or the like in order to form a gas-tight connection.
  • the gas supply line 44 is surrounded in the region of the hollow nozzle seat 26 by an insulation made of ceramic fibers 48 and the conically shaped fiber covering 50.
  • the ceramic fiber insulation 48 is held by a plate 52 which surrounds the gas supply line 44.
  • the plate 52 is fastened by a spacer tube 54 which surrounds the line 44.
  • the conically shaped fiber covering 50 is made of heat-swellable sealing material which swells during heating and forms a third seal against metal penetration.
  • Suitable material is known under the name "Sureseal”, a trademark, registered by Consolidated Aluminum Corporation, for heat-swellable ceramic fiber material.
  • FIG. 4 Particularly visible in FIG. 4 is a connecting piece 56 which is inserted into the gas supply line 44 in order to connect gas-tight to a gas line 58 through which the purge gas is supplied.
  • a restraining bar 60 is fastened over the connecting piece 46 and secured by means of the screw 62.
  • the nozzle device is attached to the reactor 10 by means of a cross-shaped arm 64 which is fastened to the outer wall 20 of the reactor with bolts and nuts.
  • the cross-shaped arm is held in place by the shield 68 and the spring 70, which in turn is supported on the restraint bar 60 via the restraint plate 72 and screws 74.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Un dispositif de tuyère à gaz pour un réacteur à lit fluidisé utilisé pour dégazer des métaux fondus avec un gaz de rinçage élimine des fuites de métal hors du réacteur au niveau de la pointe de la tuyère et des fuites de gaz au niveau de la conduite d'alimentation du gaz de rinçage.

Claims (3)

1. Dispositif de buse servant d'entrée de gaz de balayage pour un réacteur à cuve à circulation tourbillonnaire de dégazage du métal, comprenant un boîtier de buse creux (26) qui comprend lui-même un premier segment à section décroissante (28) et un deuxième segment à section décroissante (30), un cône de pointe de buse creux (34) possédant une pointe de buse creuse (28), qui est engagé dans le premier segment à section décroissante (28) du boîtier de buse (26), et une conduite d'arrivée du gaz (44),
caractérisé
en ce que le deuxième segment à section décroissante (30) du boîtier de buse (26) est relié au premier (28) par un épaulement (32), la pointe de buse (38) présente une partie épaulée cylindrique arrière (40) qui remplit partiellement la cavité du premier segment (28) du boîtier de buse (26) et est pressée contre l'épaulement (32) avec interposition d'une garniture d'étanchéité de pointe de buse (36), la conduite d'arrivée du gaz (44) se termine dans la partie épaulée (40) et est entourée d'un isolant (thermique) (48, 50) dans la région du boîtier de buse creux (26).
2. Dispositif selon la revendication 1, caractérisé en ce que l'isolant (48, 50) comprend une première (48) et une deuxième (50) gaines fibreuses céramiques gonflant à la chaleur.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la conduite d'arrivée du gaz (44) est guidée par une plaque (52) qui se trouve dans la partie supérieure du premier segment (28) du boîtier de buse (26).
EP87901324A 1986-02-26 1987-02-23 Dispositif de degazage de metaux fondus Expired - Lifetime EP0258326B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87901324T ATE56089T1 (de) 1986-02-26 1987-02-23 Vorrichtung zum entgasen von geschmolzenen metallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US833172 1986-02-26
US06/833,172 US4647018A (en) 1986-02-26 1986-02-26 Apparatus for degassing molten metal

Publications (2)

Publication Number Publication Date
EP0258326A1 EP0258326A1 (fr) 1988-03-09
EP0258326B1 true EP0258326B1 (fr) 1990-08-29

Family

ID=25263652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87901324A Expired - Lifetime EP0258326B1 (fr) 1986-02-26 1987-02-23 Dispositif de degazage de metaux fondus

Country Status (15)

Country Link
US (1) US4647018A (fr)
EP (1) EP0258326B1 (fr)
JP (1) JPS63502517A (fr)
CN (1) CN1007824B (fr)
AU (1) AU592855B2 (fr)
BR (1) BR8706036A (fr)
DD (1) DD260520A5 (fr)
ES (1) ES2003688A6 (fr)
FI (1) FI874705A (fr)
HU (1) HU197961B (fr)
IS (1) IS1389B6 (fr)
NZ (1) NZ219111A (fr)
PL (1) PL147882B1 (fr)
WO (1) WO1987005382A1 (fr)
ZA (1) ZA87731B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4213007C1 (de) * 1992-04-21 1993-12-16 Tech Resources Pty Ltd Verfahren und Vorrichtung zum Abdichten von Düsen in der umgebenden feuerfesten Ausmauerung
US8652397B2 (en) * 2010-04-09 2014-02-18 Southwire Company Ultrasonic device with integrated gas delivery system
US20140210144A1 (en) * 2013-01-31 2014-07-31 Pyrotek Composite degassing tube
PL3071718T3 (pl) * 2013-11-18 2020-02-28 Southwire Company, Llc Sondy ultradźwiękowe z wylotami gazu dla odgazowywania stopionych metali

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1421793A (en) * 1973-06-20 1976-01-21 Electricity Council Injectors for injecting gas into molten metal
US4177066A (en) * 1978-06-12 1979-12-04 Swiss Aluminium Ltd. Method and apparatus for the removal of impurities from molten metal
US4392636A (en) * 1981-07-22 1983-07-12 Swiss Aluminium Ltd. Apparatus for degassing molten metal
GB8503927D0 (en) * 1985-02-15 1985-03-20 Injectall Ltd Introducing treatment substances into liquids
US4494735A (en) * 1983-11-16 1985-01-22 Swiss Aluminium Ltd. Apparatus for degassing molten metal

Also Published As

Publication number Publication date
JPH0356288B2 (fr) 1991-08-27
HU197961B (en) 1989-06-28
BR8706036A (pt) 1988-01-19
FI874705A0 (fi) 1987-10-26
HUT46139A (en) 1988-09-28
AU592855B2 (en) 1990-01-25
CN87101583A (zh) 1987-09-09
NZ219111A (en) 1989-03-29
ES2003688A6 (es) 1988-11-01
CN1007824B (zh) 1990-05-02
AU7029087A (en) 1987-09-28
ZA87731B (en) 1987-07-30
WO1987005382A1 (fr) 1987-09-11
PL147882B1 (en) 1989-08-31
DD260520A5 (de) 1988-09-28
IS3191A7 (is) 1987-08-27
FI874705A (fi) 1987-10-26
JPS63502517A (ja) 1988-09-22
PL264285A1 (en) 1988-01-07
IS1389B6 (is) 1989-09-28
EP0258326A1 (fr) 1988-03-09
US4647018A (en) 1987-03-03

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