EP0258326A1 - Dispositif de degazage de metaux fondus. - Google Patents

Dispositif de degazage de metaux fondus.

Info

Publication number
EP0258326A1
EP0258326A1 EP87901324A EP87901324A EP0258326A1 EP 0258326 A1 EP0258326 A1 EP 0258326A1 EP 87901324 A EP87901324 A EP 87901324A EP 87901324 A EP87901324 A EP 87901324A EP 0258326 A1 EP0258326 A1 EP 0258326A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
gas
nozzle tip
shoulder
hollow
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.)
Granted
Application number
EP87901324A
Other languages
German (de)
English (en)
Other versions
EP0258326B1 (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 Holdings AG
Schweizerische Aluminium 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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
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

Links

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 an improved gas injector system for use in a vortex tank reactor for degassing molten metal with a purge gas.
  • the vortex tank reactor comprises a first part which is essentially equipped with a cylindrical side wall and below that, below the first, essentially cylindrical side wall part, a second, narrowing side wall part.
  • the gas injection nozzles for the purge gas are of different heights in the walls of the narrowing side wall part Positions arranged to optimize the bubble distribution of the purge gas throughout the melt as it passes 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 apparatus 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.
  • US Pat. No. 4,392,636 describes a gas inlet nozzle for use in a vortex tank reactor in accordance with the aforementioned US Pat. No. 4,177,066.
  • the gas inlet system comprises a nozzle insert which is located in the wall of the vortex tank reactor chert is inserted 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 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.
  • US Pat. No. 4,494,735 describes a gas inlet nozzle 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 presses in order to avoid a seal between the tip and the tip cone and thus a metal passage from the reactor in the area of the purge 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.
  • a first object of the present invention is an improved gas injection nozzle for supplying gaseous material, which is free of leakage problems in the gas supply line.
  • a main object of the present invention is to provide a gas injection nozzle for use in a vortex tank reactor for the degassing of molten metal with a purge gas.
  • the present invention includes an improved gas injector device for use in a vortex tank reactor for use in degassing molten metal with a purge gas.
  • the gas inlet nozzle device comprises a hollow nozzle seat, the bore of which has a first tapered section and a second tapered section, both connected by a shoulder part, furthermore a hollow nozzle tip cone, sealingly fitted in the region of this second tapered section to form a first seal, further one Nozzle tip seal in said first tapered section, which abuts the shoulder part of the hollow nozzle seat, forming a second seal and a hollow nozzle tip with a cylindrical shoulder part and a tapered tip part, arranged in the region of the hollow nozzle seat, the conically tapering nozzle tip in the hollow nozzle tip cone is received and the shoulder part is pressed against the nozzle tip seal, the seal between the shoulder part of the nozzle tip and the nozzle seat is sealingly fitted, and a gas supply seal, attached to the nozzle tip for supplying gas, and further insulation materials that surround the
  • the device of the present invention eliminates metal penetrations from the reactor in the area of the nozzle tip, prevents gas breakthroughs in the gas feed line and allows the nozzle to be easily replaced in the event of a blockage.
  • Figure 1 is a schematic view of a preferred embodiment of a vortex tank reactor as described in U.S. Patent No. 4,177,066 with the improved gas injector device of the present invention.
  • Figure 2 is a partial schematic view of the gas injector device of the present invention, taken along line 2-2 of Figure 3.
  • Figure 3 is a front view of the gas injector holder attached to the vortex tank reactor.
  • Figure 4 is an exploded view of the parts of the gas injector assembly in accordance with the present invention.
  • the purge gas nozzle 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.
  • a vortex tank reactor comprising a first substantially cylindrical side wall part 12 and a second downwardly tapering side wall 14, below the cylindrical side wall part 12.
  • purge gas nozzle devices according to the present invention can 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 included.
  • a number of gas nozzle devices are each fastened in the tapered side wall part 14 by means of a holding frame 16.
  • the tapered side wall portion 14 of the vortex tank reactor which is 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 is in each of the openings 24 brought, the bore has a first narrowing section 28 and a second narrowing section 30, both of which are connected by a shoulder portion 32.
  • the nozzle seat 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 narrowing bore 30 of the hollow nozzle tip 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 inside the hollow nozzle seat 26, such that the tapering 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 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. It has been found that metal penetration is prevented when using the gas injector of the present invention.

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.
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
US06/833,172 US4647018A (en) 1986-02-26 1986-02-26 Apparatus for degassing molten metal
US833172 1986-02-26

Publications (2)

Publication Number Publication Date
EP0258326A1 true EP0258326A1 (fr) 1988-03-09
EP0258326B1 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) FI874705A0 (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
CA2931124C (fr) * 2013-11-18 2022-11-29 Southwire Company, Llc Sondes a ultrasons avec sorties de gaz pour le degazage de metaux en fusion

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8705382A1 *

Also Published As

Publication number Publication date
DD260520A5 (de) 1988-09-28
EP0258326B1 (fr) 1990-08-29
BR8706036A (pt) 1988-01-19
JPS63502517A (ja) 1988-09-22
AU592855B2 (en) 1990-01-25
ZA87731B (en) 1987-07-30
PL147882B1 (en) 1989-08-31
IS1389B6 (is) 1989-09-28
HU197961B (en) 1989-06-28
NZ219111A (en) 1989-03-29
JPH0356288B2 (fr) 1991-08-27
ES2003688A6 (es) 1988-11-01
FI874705A (fi) 1987-10-26
IS3191A7 (is) 1987-08-27
US4647018A (en) 1987-03-03
CN1007824B (zh) 1990-05-02
CN87101583A (zh) 1987-09-09
PL264285A1 (en) 1988-01-07
HUT46139A (en) 1988-09-28
FI874705A0 (fi) 1987-10-26
AU7029087A (en) 1987-09-28
WO1987005382A1 (fr) 1987-09-11

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