[go: up one dir, main page]

WO1996041023A1 - Appareil d'auto-etancheification d'une tuyere d'admission immergee d'un reacteur a metal fondu - Google Patents

Appareil d'auto-etancheification d'une tuyere d'admission immergee d'un reacteur a metal fondu Download PDF

Info

Publication number
WO1996041023A1
WO1996041023A1 PCT/US1996/008530 US9608530W WO9641023A1 WO 1996041023 A1 WO1996041023 A1 WO 1996041023A1 US 9608530 W US9608530 W US 9608530W WO 9641023 A1 WO9641023 A1 WO 9641023A1
Authority
WO
WIPO (PCT)
Prior art keywords
tuyere
refractory lining
plate
lining
refractory
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.)
Ceased
Application number
PCT/US1996/008530
Other languages
English (en)
Inventor
Mark A. Wilkinson
Rick M. Rauenzahn
Christopher J. Nagel
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.)
Molten Metal Technology Inc
Original Assignee
Molten Metal Technology Inc
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 Molten Metal Technology Inc filed Critical Molten Metal Technology Inc
Priority to AU59743/96A priority Critical patent/AU5974396A/en
Publication of WO1996041023A1 publication Critical patent/WO1996041023A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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
    • C21C5/48—Bottoms or tuyéres of converters

Definitions

  • Tuyeres are commonly used for injecting various 5 feed materials, such as organic compositions, into a molten metal bath or molten salt bath. Tuyeres are typically embedded in the refractory wall that lines the reactor interior.
  • a tuyere is a pipe that extends through the refractory wall to the 0 interior surface of the refractory wall and is flush with the surface. The opening of the tuyere is usually located below the surface of the molten bath, either on the side or the bottom of the reactor wall.
  • a 5 portion of the feed material can be deflected back toward the wall. Consequently, the feed material that is directed into the molten bath is subject to a significant amount of static pressure and forms an accretion of feed and partially decomposed feed at the 0 opening of the tuyere.
  • the present invention relates to an apparatus for self-sealing a submerged feed inlet of molten metal reactor.
  • the apparatus includes a tuyere at the submerged inlet and extending through a refractory lining of the reactor.
  • a plate projects from the tuyere and is embedded within the refractory lining, whereby feed, which is directed through the tuyere and which seeps between the tuyere and the refractory lining, is diverted by the plate away from the tuyere into the refractory lining to seal the submerged inlet.
  • the apparatus in another embodiment, includes a tuyere at the submerged inlet and extending through the refractory lining.
  • An assembly lining surrounds the tuyere and a portion of the refractory lining and is embedded within the refractory lining, whereby feed, which is directed through the tuyere and which seeps into the refractory lining, is diverted by the assembly lining toward the molten bath to seal the submerged inlet.
  • the apparatus includes a tuyere at the submerged inlet and extending through the refractory lining.
  • a plate projects transversely from the tuyere and is embedded within the refractory lining, whereby feed, which is directed through the tuyere and which seeps into the refractory lining is diverted by the plate toward the molten bath to at least partially seal the submerged inlet.
  • An assembly lining surrounds the tuyere, plate and a portion of the refractory lining and embedded within the refractory lining, whereby feed, which is directed through the tuyere and which seeps into the refractory lining, is further diverted by the assembly lining toward the molten bath to seal the submerged inlet.
  • the plate provides a means for inhibiting the seepage of feed material from the reactor. Another advantage is that feed material that escapes into the void space is directed away from the tuyere into a portion of the refractory material that has a temperature sufficiently high to cause at least a portion of the feed material to dissociate. An additional advantage is that the plate is relatively easy to fabricate and to place within the refractory wall. Another advantage is that liquid and gas accumulation within the refractory are inhibited and are directed back into the bath.
  • Figure 1 is a cut-away side elevational view of one embodiment of the apparatus of the present invention in a molten bath of a reactor.
  • Figure 1A is a cut-away side elevational view of the submerged portion of the tuyere and plate shown in Figure 1.
  • Figure 2 is a cut-away side elevational view of a second embodiment of the tuyere and plate shown in Figures 1 and 1A.
  • Figure 3 is a cut-away side elevational view of a third embodiment of the tuyere and plate shown in Figures 1 and 1A.
  • Figure 4 is a cut-away side elevational view of a fourth embodiment of the apparatus including a tuyere and tuyere assembly lining.
  • the present invention relates generally to an apparatus for sealing a submerged inlet of a molten metal reactor having a refractory lining.
  • a process and apparatus for dissociating waste in molten baths are disclosed in U.S. Patents 4,574,714 and 4,602,574, issued to Bach et al.
  • system 10 includes reactor 12 for containing a molten bath suitable for dissociating a feed material.
  • reactors includes appropriately modified steel aking vessels known in the art, such as K-BOP, Q-BOP, argon-oxygen decarbonization furnace (AOD) , BOF, etc.
  • AOD argon-oxygen decarbonization furnace
  • Reactor 12 includes upper portion 14 and lower portion 16.
  • Off-gas outlet 18 extends from upper portion 14 and is suitable for conducting an off-gas composition out of reactor 12.
  • Reactor 12 has metal shell 17 and is lined with refractory lining 19.
  • Refractory lining 19 can be bricks composed of aluminum oxide (A1 2 0 3 ) , silicon dioxide (Si0 2 ) , thorium dioxide (Th0 2 ) , magnesium oxide ( gO) , zirconium dioxide (Zr0 2 ) , or other suitable material, such as a ceramic.
  • the refractory lining can be coated with a gas impermeable coating, such as sputtered aluminum oxide.
  • Tuyere 20 is located at lower portion 16 of reactor 12 and can be a multiple concentric tuyere, in particular, a triple concentric tuyere.
  • Tuyere 20, which is a concentric tuyere includes feed material tube 22 for injection of a feed material at feed material inlet 24.
  • Line 26 extends between feed material tube 22 and feed material source 28 for conducting feed material from feed material source 28.. by pump 30 to feed material tube 22.
  • Oxidizing agent tube 32 of tuyere 20 is disposed concentrically about feed material tube 22 at tuyere inlet 24.
  • Line 35 extends between oxidizing agent source 36 and oxidizing agent tube 34 for conducting a suitable oxidizing agent to oxidizing agent tube 34.
  • Oxidizing agent can be oxygen or air which can oxidize a portion of the waste to form a dissociation product, such as carbon monoxide or carbon dioxide.
  • Shroud gas tube 38 of tuyere 20 is disposed concentrically about oxidizing agent tube 32 at inlet 24.
  • Line 40 extends between shroud gas tube 38 and shroud gas ⁇ source 42 for conducting a suitable shroud gas through the concentric opening between oxidizing agent tube 32 and shroud gas tube 38 to inlet 24.
  • Shroud gas can be an inert gas, such as argon or nitrogen, or a hydrocarbon, such as propane.
  • Bottom tapping spout 44 extends from lower portion 16 of reactor 12 and is suitable for removal of molten metal from reactor 12.
  • Induction coil 46 is located at lower portion 16 for heating molten bath 48 in reactor 12. It is to be understood that, alternatively, reactor 12 can be heated by other suitable means, such as by oxyfuel burners, electric arcs, etc.
  • Molten bath 48 is formed within reactor 12.
  • Molten bath 48 can include at least one metal or molten salt thereof.
  • suitable metals include iron, copper, nickel, zinc, etc.
  • suitable salts include sodium chloride, potassium chloride, etc.
  • Molten bath 48 can also include more than one metal.
  • molten bath 48 can include a solution of miscible metals, such as iron and nickel.
  • molten bath 48 can be formed substantially of elemental metal.
  • molten bath 48 can be formed substantially of metal salts.
  • Molten bath 48 is formed by at least partially filling reactor 12 with a suitable metal or salt.
  • molten bath 48 is formed of immiscible metals. These immiscible metals can include first metal 50, such as iron, and second metal 52, such as copper. Molten bath 48 is then heated by a suitable means, such as an induction coil or oxyfuel burner, not shown.
  • Suitable operating conditions of system 10 include, for example, a temperature which is sufficient to at least partially convert carbonaceous feed by dissociation to elemental carbon and other elemental constituents. Generally, a temperature in the range of between about 1,300° and 1,700°C is suitable.
  • Vitreous layer 54 is formed on molten bath 48. Vitreous layer 54 is substantially immiscible with molten bath 48. Vitreous layer 54 can have a lower thermal conductivity than that of molten bath 48.
  • vitreous layer 54 includes at least one metal oxide.
  • Vitreous layer 54 can contain a suitable compound for scrubbing halogens, such as chlorine or fluorine, to prevent formation of hydrogen halide gases, such as hydrogen chloride.
  • vitreous layer 54 comprises a metal oxide having a free energy of oxidation, at the operating conditions of system 10, which is less than that from the oxidation of. atomic carbon to carbon monoxide, such as calcium ' oxide (CaO) .
  • a self-sealing submerged feed inlet includes tuyere 20 and plate 54, positioned about shroud gas tube 38 in refractory lining 19.
  • Plate 54 has an interior radius about equal to the outside diameter of tuyere 20.
  • An outside edge of plate 54 extends into zone 56 within refractory lining 19.
  • Zone 56 is at conditions sufficient to dissociate a substantial portion of the feed material present therein.
  • Void space 58 extends between refractory lining 19 and tuyere 20 from the interior surface 21 of refractory lining 19 to plate 54. Void space 58 can form as a result of the differences in the thermal expansion of the refractory material 19 and tuyere 20 at the operating temperature of the reactor.
  • Plate 54 extends from the outside circumference of tuyere 20 into the refractory lining 19.
  • annular plate has a radius of about 8.0 centimeters and a thickness of 0.1 centimeters. Plate 54 is about 10.0 centimeters from surface 21 of refractory lining 19.
  • plate 54 is corrugated.
  • the temperature at the outside edge of the plate is in the range of between about 800 and 1,100°C.
  • plate 54 can be heated by other suitable means, such as resistant heating by conducting an electrical current though the plate.
  • Annular plate is considered thin so that the ratio ( (K r /L r ) / (K r /L f ) ) / (__,/-_-) is greater than about one.
  • K r and K represent the thermal conductivity of the refractory lining and the annular plate, respectively.
  • L r represents the distance from refractory surface 21 to plate 54.
  • L f represents the distance from shroud gas tube 38 to outer edge 55 of plate 54.
  • ⁇ ⁇ represents the thickness of plate 54.
  • Plate 54 is constructed of a material that can withstand the temperature and conditions of the molten bath 46 and feed material at the operating temperature of reactor 12.
  • plate 54 is constructed of a metal selected from the group consisting of stainless steel, titanium, tungsten, tantalum and zirconium. Also, a ceramic can be used.
  • Plate 54 is attached to tuyere 20 in a manner to form seal 53 between plate 54 and tuyere 20 which prevents substantial passage of the feed material therethrough.
  • plate 54 can be welded to tuyere 20.
  • Thermocouples 62 can be positioned at points on plate 54 to monitor the temperature of annular plate 54. Tuyere 24 and plate 54 can be in tuyere assembly 69.
  • Tuyere assembly 69 can be formed of a refractory brick with tuyere assembly lining 70 or "can" surrounding tuyere assembly 69.
  • Tuyere assembly lining 70 can be formed of a metal, ceramic or plasma coating.
  • a suitable material includes one that has a melting point higher than the operating conditions of the molten bath and is resistive to chemical attack. This material includes tungsten, zirconium oxide and sputtered alumina.
  • tuyere assembly lining 70 is formed of a metal or plasma coating to prevent gas egress through the sides of tuyere assembly 69.
  • the plasma coating is material applied by a plasma spraying process, as is known in the art.
  • Feed material such as a suitable gaseous, liquid or solid feed, is directed into molten bath 48 from feed material source 28 through line 26 to feed material tube 22 in tuyere 20. Feed material enters molten bath 48 at inlet 24.
  • Oxygen or another oxidizing agent is directed from oxidizing agent source 35 through line 34 to oxidizing agent tube 38.
  • a suitable shroud gas such as a hydrocarbon or inert gas, is directed from shroud gas source 42 through line 40 to shroud gas tube 38.
  • a portion of the feed material is deflected by accretion 63 formed at tuyere opening 24 and the static pressure of molten bath 48 toward refractory lining 19 and void space 58 which is adjacent to refractory lining 19.
  • the feed material travels along the outside of the tuyere 20 in direction 64 toward the exterior of reactor 12.
  • Plate 54 deflects at least a portion of feed material escaping from molten bath 48 in a direction transverse of the axis extending the length of tuyere 20.
  • the feed material can be directed into zone 56 which can have conditions to dissociate the feed material into dissociated products, such as carbon oxide gas.
  • the dissociated products can remain within refractory lining during the remainder of the operating run of reactor 12 blocking further escape of feed materials and dissociation products, thereby self- sealing the submerged feed inlet. A portion of the dissociation products can seep through refractory lining 19 to molten bath 48.
  • FIG 2 a second embodiment of the invention is shown.
  • Conical plate 66 is positioned about tuyere 20.
  • Outer edge 68 extends toward molten bath 48 to direct escaping feed material transversely of the axis of the tuyere and coward molten bath 48.
  • the feed material can be directed into zone 56 which can have conditions to dissociate the feed material into dissociated products. These products can remain within the refractory lining to further block further escape of feed materials and dissociation products.
  • the plate extends perpendicularly from the tuyere and then conically toward the molten metal bath.
  • FIG 3 a third embodiment of the invention is shown. A series of plates can be used.
  • second plate 90 is positioned about tuyere 20. Second plate 90 deflects at least an additional portion of feed material escaping from molten bath 48. Second plate 90 can be parallel to plate 54. In one embodiment, second plate 90 has a diameter greater than plate 54. Preferably, plate 54 is positioned so that the temperature on plate 54 is above the dissociation temperature of the feed material, and second plate 90 is positioned at a temperature above the vaporization temperature of the dissociated products. In other embodiments, multiple plates are used, such as three plates. Also, the plates can be formed of different materials, such as one plate is formed of a metal, and a second plate is formed of ceramic. Further, each plate can be individually heated by suitable heating means.
  • Tuyere assembly 69 has tuyere assembly lining 70 without a plate. Tuyere assembly lining 70 allows the gaseous products of dissociations and liquids to be contained in tuyere assembly 70 and directed into molten bath in region 92. Tuyere assembly, lining 70 can be connected to tuyere 20 by means similar to seal 53 which connects plate 54 to tuyere 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention décrit un appareil d'auto-étanchéification d'un orifice d'admission immergé (24) d'un réacteur à métal fondu (12) ayant un revêtement réfractaire (19). L'appareil est composé d'une tuyère (20) au niveau de l'orifice d'admission immergé, qui passe à travers le revêtement réfractaire (19). Une plaque (54) est encastrée à l'intérieur du revêtement réfractaire (19), de sorte que la charge, qui est dirigée à travers la tuyère (20) et s'infiltre entre la tuyère (20) et le revêtement réfractaire (19), est déviée de la tuyère (20) par la plaque (54) pour pénétrer dans le revêtement réfractaire (19), assurant ainsi l'étanchéité de l'orifice d'admission immergé (24).
PCT/US1996/008530 1995-06-07 1996-06-04 Appareil d'auto-etancheification d'une tuyere d'admission immergee d'un reacteur a metal fondu Ceased WO1996041023A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU59743/96A AU5974396A (en) 1995-06-07 1996-06-04 Appartus for self-sealing a submerged inlet tuyere of a molten metal reactor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47689095A 1995-06-07 1995-06-07
US08/476,890 1995-06-07

Publications (1)

Publication Number Publication Date
WO1996041023A1 true WO1996041023A1 (fr) 1996-12-19

Family

ID=23893665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/008530 Ceased WO1996041023A1 (fr) 1995-06-07 1996-06-04 Appareil d'auto-etancheification d'une tuyere d'admission immergee d'un reacteur a metal fondu

Country Status (4)

Country Link
AU (1) AU5974396A (fr)
TW (1) TW323246B (fr)
WO (1) WO1996041023A1 (fr)
ZA (1) ZA964736B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2656913C1 (ru) * 2016-06-15 2018-06-07 Закрытое акционерное общество "Ферро Балт Плюс" Фурма для донной продувки металла газами в ковше
RU173094U1 (ru) * 2016-06-15 2017-08-10 Закрытое акционерное общество "Ферро Балт Плюс" Фурма для донной продувки металла газами в ковше

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0053802A1 (fr) * 1980-12-05 1982-06-16 Kortec Ag Procédé et dispositif pour protéger les tuyères et le garnissage d'un récipient pour l'affinage d'un bain métallique
JPS5941414A (ja) * 1982-09-02 1984-03-07 Kawasaki Steel Corp 精練容器羽口部の補修方法
JPS5993829A (ja) * 1982-11-17 1984-05-30 Nisshin Steel Co Ltd 造管機用保熱装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0053802A1 (fr) * 1980-12-05 1982-06-16 Kortec Ag Procédé et dispositif pour protéger les tuyères et le garnissage d'un récipient pour l'affinage d'un bain métallique
JPS5941414A (ja) * 1982-09-02 1984-03-07 Kawasaki Steel Corp 精練容器羽口部の補修方法
JPS5993829A (ja) * 1982-11-17 1984-05-30 Nisshin Steel Co Ltd 造管機用保熱装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 130 (C - 229) 16 June 1984 (1984-06-16) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 205 (C - 243) 19 September 1984 (1984-09-19) *

Also Published As

Publication number Publication date
AU5974396A (en) 1996-12-30
TW323246B (fr) 1997-12-21
ZA964736B (en) 1996-12-19

Similar Documents

Publication Publication Date Title
US5443572A (en) Apparatus and method for submerged injection of a feed composition into a molten metal bath
US5571486A (en) Method and apparatus for top-charging solid waste into a molten metal bath
US5301620A (en) Reactor and method for disassociating waste
EP0600906B1 (fr) Procede d'oxydation dans un bain de fusion
US4601752A (en) Method of manufacturing metals and/or generating slag
US5939016A (en) Apparatus and method for tapping a molten metal bath
KR20210010363A (ko) 순산소 전로용 통풍구
HU209992B (en) Ceramic welding process and lance use in such process
EP0356943B1 (fr) Tuyère métallurgique résistant à l'usure
EP0736485A1 (fr) Méthode et dispositif pour l'injection d'oxygène préchauffé dans un réacteur à haute température
KR100339261B1 (ko) 야금로의 구조 및 그 야금로의 하부조 교환방법, 그 야금로의 조업방법 및 그 야금로에 사용되는 플랜지의 시일장치
WO1996041023A1 (fr) Appareil d'auto-etancheification d'une tuyere d'admission immergee d'un reacteur a metal fondu
JPS59197530A (ja) 冶金装置の操作方法
WO1997016051A1 (fr) Dispositif de chauffage electrique
US5423900A (en) Method for blowing oxidizing gases into molten metal
US4196159A (en) Process for increasing the life of the refractory masonry of metallurgical vessels
WO1999029913A1 (fr) Dispositif d'injection de matiere d'alimentation et procede de regulation de l'accretion
US4401466A (en) Process for protection of nozzles and refractory lining of a vessel for refining molten metal
US4421555A (en) Method of and apparatus for metallurgical treatment of a melt
TW434318B (en) Structure of metallurgical furnace and operating method using the same metallurgical furnace
WO1996025202A1 (fr) Couche formant barriere sur un revetement refractaire et son procede de formation
JP3569337B2 (ja) 浸漬管
AU2004322947B2 (en) Composite sparger
Nunnington et al. Developments in refractories for plasma technology
JPH0196315A (ja) 判定レンガ付溶湯容器

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BB BG BR BY CA CH CN CZ DE DK EE ES FI GB GE HU IL IS JP KE KG KP KR KZ LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA