WO2008108943A1 - Appareil d'affinage de verre - Google Patents

Appareil d'affinage de verre Download PDF

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Publication number
WO2008108943A1
WO2008108943A1 PCT/US2008/002503 US2008002503W WO2008108943A1 WO 2008108943 A1 WO2008108943 A1 WO 2008108943A1 US 2008002503 W US2008002503 W US 2008002503W WO 2008108943 A1 WO2008108943 A1 WO 2008108943A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
cradle
refractory
bedding material
channels
Prior art date
Application number
PCT/US2008/002503
Other languages
English (en)
Inventor
Raymond E. Fraley
Lawrence H. Kotacska
Original Assignee
Corning Incorporated
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 Corning Incorporated filed Critical Corning Incorporated
Priority to CN2008800144049A priority Critical patent/CN101675009B/zh
Priority to KR1020097020420A priority patent/KR101454049B1/ko
Priority to JP2009551699A priority patent/JP5335700B2/ja
Publication of WO2008108943A1 publication Critical patent/WO2008108943A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/225—Refining
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/42—Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/02—Forehearths, i.e. feeder channels

Definitions

  • This invention relates to an apparatus for fining molten glass and, in particular, to the support and protection of precious metal fining vessels.
  • An exemplary process for manufacturing glass articles begins with the melting of raw feed materials, such as metal oxides, to form a molten glass.
  • the melting process not only results in the formation of glass, but also the formation of various unwanted byproducts, including various gases such as oxygen, carbon dioxide, carbon monoxide, sulfur dioxide, sulfur trioxide, argon, nitrogen, and water. Unless removed, these gases can continue throughout the manufacturing process, ending up as small, sometimes microscopic gaseous inclusions in the finished glass article.
  • gases such as oxygen, carbon dioxide, carbon monoxide, sulfur dioxide, sulfur trioxide, argon, nitrogen, and water. Unless removed, these gases can continue throughout the manufacturing process, ending up as small, sometimes microscopic gaseous inclusions in the finished glass article.
  • the presence of small gaseous inclusions is not detrimental. However, for other articles of manufacture, gaseous inclusions as small as 50 ⁇ m in diameter are unacceptable.
  • One such article is the glass sheet used in the manufacture of display devices such as liquid crystal and organic light emitting dio
  • a fining agent or agents are typically added to the feed material.
  • the fining agent is a multivalent compound that enters a reduced valence state when cooled, absorbing oxygen in the process, and enters a higher valence state when heated thereby releasing the oxygen.
  • the released oxygen serves to cause gases in the molten glass, or melt, to coalesce and rise to the surface of the melt, where it is removed from the process.
  • the heating is typically performed in a high temperature fining vessel.
  • Typical fining temperatures for display-grade glasses can be as high as 1700 0 C. Temperatures this high require the use of specialized metals or alloys to prevent destruction of the vessel.
  • Platinum or platinum alloys such as platinum-rhodium are typically used. Platinum advantageously has a high melting temperature and does not easily dissolve in the glass. Nevertheless, at such high temperatures, the platinum or platinum alloy readily oxidizes. Therefore, steps must be taken to prevent contact between the hot platinum fining vessel and atmospheric oxygen. Moreover, because platinum is a precious metal and quite expensive, the walls of the fining vessel are generally manufactured as thinly as possible. Thus, the fining vessel may further require physical support.
  • an apparatus for fining glass comprising a cradle defining a trough, a vessel for conveying molten glass disposed within the trough, a bedding material disposed between the cradle and the vessel comprising channels, and keystones for supporting at least a portion of the bedding material engaged with channels in the bedding material
  • an apparatus for fining glass comprising a refractory cradle defining a trough and side walls extending upward from the trough, a vessel comprised of platinum disposed within the trough, a refractory bed disposed between the vessel and the cradle, the refractory bed surrounding the vessel and comprising channels in an upper portion thereof, refractory keystones disposed above the cradle and wherein the refractory keystones engage with the channels to support the refractory bed.
  • FIG. 1 is a cross sectional drawing illustrating an apparatus for fining a molten glass in accordance with an embodiment of the present invention, and including a cradle for supporting the fining vessel and reducing oxidation of the fining vessel.
  • FIG. 2 is a cross sectional drawing illustrating a portion of the apparatus of FIG. 1 wherein various refractory blocks have been removed for clarity.
  • FIG. 3 is a perspective view of the cradle of FIG. 1.
  • FIG. 4 is a close-up cross sectional view of the refractory bed according to an embodiment of the present invention, showing the channels and flange regions of the bed.
  • FIG. 5 is a perspective view of the bedding material of FIG. 4, without the fining vessel, showing the channels and flange regions of the refractory bed.
  • an apparatus 10 comprising a fining vessel 12, a cradle 14, a bedding material 16, a plurality of refractory blocks 18 of various shapes and sizes, and keystones 20.
  • Fining vessel 12 is typically constructed from a metal capable of withstanding extremely high temperatures, sometimes in excess of 1700 0 C.
  • the precious metal vessel comprises a metal selected from the platinum group metals (e.g. platinum, rhodium, iridium, ruthenium, palladium, and osmium), or alloys thereof.
  • vessel 12 is used to further heat the molten glass.
  • vessel 12 may be itself heated.
  • vessel 12 is heated by passing an electric current through the metal vessel.
  • other methods of heating vessel 12 as are known in the art may be used, such as, for example, a flame.
  • Fining vessel 12 is preferably in the form of a cylindrical tube.
  • Cradle 14 defines a trough 22 with sidewalls 24 which extend upward from the trough.
  • cradle 14 comprises a U-shaped trough.
  • Cradle 14 is generally formed from a material capable of withstanding high temperatures without mechanical failure.
  • a refractory refer to a material capable of withstanding high temperatures. Refractory materials consist largely of single or mixed high melting point oxides of elements such as silicon, aluminium, magnesium, calcium and zirconium. However, non-oxide refractories also exist and include materials such as carbides, nitrides, borides and graphite.
  • Cradle 14 may be formed from alumina or fused cast zirconia refractories, for example.
  • Fining vessel 12 is disposed within cradle 14 and surrounded by bedding material 16.
  • bedding material 16 is disposed between the vessel and the cradle.
  • bedding material 16 begins as refractory slurry which is poured into trough 22 to surround tube 12 and which thereafter hardens or cures in place to become a solid refractory material 16 that provides a protective bed for fining vessel 12.
  • bedding material 16 is sometimes termed the "castable" (e.g. castable 16).
  • Bedding material 16 is in intimate contact with fining vessel 12, thereby providing maximum support to the fining vessel, and helping to prevent oxygen from permeating to the outer surface of the vessel.
  • bedding material 16 should be capable of withstanding temperatures in excess of 1700 0 C.
  • Bedding material 16 is preferably a refractory composition, and may comprise high purity alumina or zirconia, for example.
  • Cradle 14 is supported by refractory blocks 18 on the sides and bottom of the cradle, and covered with similar refractory blocks. Cradle 14 and refractory blocks 18 may be further installed within an additional enclosure, such as steel enclosure 25 to provide structural support to the assembly of refractory blocks.
  • Refractory blocks 18 may be, for example, Insalcor® bricks.
  • keystones 20 preferably rest on the tops of cradle walls 24. Bedding material 16 is poured into the cradle trough and reaches the tops of keystones 20. As keystones 20 do not touch each other over cradle 14, but instead each extend inward from walls 24 less than half the distance between the walls, bedding material 16 can flow upward and reach the tops of keystones 20. Keystones 20 preferably also comprise a radius on the extended edges 26. The net result is that after bedding material 16 has hardened, bedding material 16 is engaged with keystones 20. That is, channels are formed in the upper portion of the bedding material into which keystone 20 fit.
  • Both bedding material 16 and keystones 20 are topped with additional refractory blocks 18 such that cradle 14 and keystone refractories 20 are encased within refractory blocks.
  • Keystones 20 are preferably formed from a refractory, and may, for example, comprise fused zirconia or alumina.
  • bedding material 16 is subject to plastic deformation or "creep", which can negatively impact the support function of the bedding material. That is, the bedding material may sag and deform or even crush vessel 12. This is offset in the lower portion of the vessel by the hydrostatic pressure of the molten glass flowing through the vessel.
  • molten glass typically does not fill the fining vessel; hence there is a glass level line above which hydrostatic pressure is not applied to the inside of the vessel.
  • an internal force e.g. hydrostatic pressure
  • FIG. 3 is a close-up of bedding material 16 without cradle 14 and keystones 20 for clarity, showing the region of engagement between the bedding material and the keystones. Also shown is fining vessel 12 and glass level line 28 indicating the level of molten glass 30 within the fining vessel. Without support, bedding material 16 above vessel 12 will creep over time and exert a downward force on the top of vessel 12, thereby deforming vessel 12 and risking structural failure of the vessel.
  • bedding material 16 is formed with opposing channels 32, wherein a thickness "d" between the channels is less the width "D" of flange 34 above the channels.
  • Keystones 20 engage with channels 32 on each side of bedding material 16 such that the upper portion of bedding material 16 is supported by keystones 20 engaged at channels 32.
  • keystones 20 extend into a space above vessel 12, which, when filled with the bedding material 16 in its uncured state, covers a portion of the keystones (e.g. over the upper surface of the keystone radius).
  • the bedding material forms a shape (i.e. channels 32) complementary to the shape of the extended portions of the keystones.
  • keystones 20 provide a supporting function by bearing weight from bedding material 16, thereby preventing the upper portions of bedding material 16 from sagging over time due to the high temperature of fining vessel 12.
  • Channels 32 preferably extend longitudinally along the length of bedding material 16 at the same general vertical level in an opposing relationship.
  • Apparatus 10 may further include at least one thermocouple 36 embedded within bedding material 16 so that a temperature of the fining vessel may be monitored.
  • the at least one thermocouple may be selected based on the expected temperature range to be measured, and the accuracy required for the measurement.
  • type "B” and type “S” thermocouples are typically employed in measurements of the fining vessel (e.g. metal tube 12) temperature. Both thermocouple types are noble metal thermocouples comprising platinum and rhodium. Type “B” thermocouples are typically used in applications up to about 1800 0 C, whereas type “S” thermocouples are generally employed to sense temperatures up to about 1600 0 C.
  • thermocouple is used to measure upper portions of the fining vessel, whereas type “S” thermocouples are used to measure the mid-point temperatures of the fining vessel.
  • Electrical leads 38 from the at least one thermocouple is connected with measurement equipment (not shown) which may be used to record and/or control the fining vessel temperature.
  • the bottom corners of cradle 14 may be chamfered, as indicated by dotted lines 40. By removing unnecessary material, cradle 14 can be heated more evenly, and cracking of the cradle material can be minimized. [0025] It should be emphasized that the above-described embodiments of the present invention, particularly any "preferred" embodiments, are merely possible examples of implementations, merely set forth for a clear understanding of the principles of the invention. Many variations and modifications may be made to the above-described embodiments of the invention without departing substantially from the spirit and principles of the invention. All such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Glass Compositions (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

L'invention concerne un appareil d'affinage de verre fondu qui comprend une cuve d'affinage et un berceau destiné à assurer le support et empêcher l'oxydation de la cuve d'affinage. Les bords élevés du berceau qui font saillie au-dessus de la cuve d'affinage et un matériau de revêtement interne améliorent les capacités de support et de prévention d'oxydation du berceau. Les réfractaires de la clé de voûte s'accrochent aux canaux formés dans le matériau de revêtement interne, ce qui permet d'empêcher le fluage à température élevée du matériau de revêtement interne et l'endommagement de la cuve d'affinage.
PCT/US2008/002503 2007-03-01 2008-02-26 Appareil d'affinage de verre WO2008108943A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2008800144049A CN101675009B (zh) 2007-03-01 2008-02-26 用于澄清玻璃的设备
KR1020097020420A KR101454049B1 (ko) 2007-03-01 2008-02-26 유리 제련 장치
JP2009551699A JP5335700B2 (ja) 2007-03-01 2008-02-26 ガラス清澄装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90430207P 2007-03-01 2007-03-01
US60/904,302 2007-03-01

Publications (1)

Publication Number Publication Date
WO2008108943A1 true WO2008108943A1 (fr) 2008-09-12

Family

ID=39738574

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/002503 WO2008108943A1 (fr) 2007-03-01 2008-02-26 Appareil d'affinage de verre

Country Status (5)

Country Link
JP (1) JP5335700B2 (fr)
KR (1) KR101454049B1 (fr)
CN (1) CN101675009B (fr)
TW (1) TWI365859B (fr)
WO (1) WO2008108943A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009058330A1 (fr) * 2007-11-02 2009-05-07 Corning Incorporated Berceau résistant à la corrosion et matériaux aptes être coulés pour la production de verre
WO2009061484A1 (fr) * 2007-11-08 2009-05-14 Corning Incorporated Procédé et système d'affinage de verre
WO2014070650A1 (fr) * 2012-11-02 2014-05-08 Corning Incorporated Appareil et procédé permettant de minimiser l'inclusion de particules à base de métaux du groupe du platine dans un verre fondu
WO2019108995A1 (fr) * 2017-12-01 2019-06-06 Corning Incorporated Appareil et procédé de production de verre

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102643010A (zh) * 2012-03-30 2012-08-22 彩虹显示器件股份有限公司 一种提高澄清管使用寿命的耐火保温结构
CN203498243U (zh) * 2012-09-27 2014-03-26 安瀚视特控股株式会社 玻璃基板的制造装置
WO2015057646A1 (fr) * 2013-10-18 2015-04-23 Corning Incorporated Appareil et procédé de préparation du verre
KR20210042151A (ko) * 2018-08-10 2021-04-16 코닝 인코포레이티드 유리 리본의 제조 장치 및 방법들
KR20210064347A (ko) * 2018-09-27 2021-06-02 코닝 인코포레이티드 모듈식 유리 청징 시스템들을 포함하는 유리 성형 장치들

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906272A (en) * 1989-04-17 1990-03-06 Corning Incorporated Furnace for fining molten glass
US20040067369A1 (en) * 2000-11-30 2004-04-08 Franz Ott Coated metal element used for producing glass

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10249862B4 (de) * 2002-10-25 2020-06-10 AGC Inc. Aus PGM-Werkstoffen gefertigte Läuterkammer
DE102007008102B4 (de) * 2007-02-19 2020-12-03 Umicore Ag & Co. Kg Vorrichtung zum Einsatz in der Glasindustrie und Verfahren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906272A (en) * 1989-04-17 1990-03-06 Corning Incorporated Furnace for fining molten glass
US4906272B1 (fr) * 1989-04-17 1992-09-15 Corning Glass Works
US20040067369A1 (en) * 2000-11-30 2004-04-08 Franz Ott Coated metal element used for producing glass

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009058330A1 (fr) * 2007-11-02 2009-05-07 Corning Incorporated Berceau résistant à la corrosion et matériaux aptes être coulés pour la production de verre
WO2009061484A1 (fr) * 2007-11-08 2009-05-14 Corning Incorporated Procédé et système d'affinage de verre
US8925353B2 (en) 2007-11-08 2015-01-06 Corning Incorporated Process and system for fining glass
WO2014070650A1 (fr) * 2012-11-02 2014-05-08 Corning Incorporated Appareil et procédé permettant de minimiser l'inclusion de particules à base de métaux du groupe du platine dans un verre fondu
WO2019108995A1 (fr) * 2017-12-01 2019-06-06 Corning Incorporated Appareil et procédé de production de verre

Also Published As

Publication number Publication date
JP2010520141A (ja) 2010-06-10
KR20090127308A (ko) 2009-12-10
CN101675009B (zh) 2012-11-14
KR101454049B1 (ko) 2014-10-24
TWI365859B (en) 2012-06-11
TW200909369A (en) 2009-03-01
CN101675009A (zh) 2010-03-17
JP5335700B2 (ja) 2013-11-06

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