US3376373A - Electric glassmaking furnace - Google Patents

Electric glassmaking furnace Download PDF

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Publication number
US3376373A
US3376373A US438574A US43857465A US3376373A US 3376373 A US3376373 A US 3376373A US 438574 A US438574 A US 438574A US 43857465 A US43857465 A US 43857465A US 3376373 A US3376373 A US 3376373A
Authority
US
United States
Prior art keywords
furnace
glass
chamber
bubbles
electric
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
US438574A
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English (en)
Inventor
Jacques Marie Yves Le Cl Bussy
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.)
Verreries Pochet et du Courval SA
Original Assignee
Verreries Pochet et du Courval SA
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 Verreries Pochet et du Courval SA filed Critical Verreries Pochet et du Courval SA
Application granted granted Critical
Publication of US3376373A publication Critical patent/US3376373A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
    • C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
    • C03B5/0275—Shaft furnaces
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention has as its object modifications and improvements applied to this furnace.
  • the refining device comprises two horizontal discs with an approximately plane or conical surface, brought nearer towards one another at least at their edges, the spacing between the discs communicating with one or more escape orifices for the bubbles and with an extraction device for the fine glass; the escape orifice for the bubbles communicates with the interior of the trough, and the extraction device for the fine glass communicates with the exterior of the trough; the means which enable the portion of the withdrawn glass to be subjected to a rapid rise of temperature, consist of a source of electric current, the terminals of which are connected respectively to the two discs of said device.
  • the furnace according to the present invention differs from this embodiment by modifications which result from studies and experiments aimed at further improving the yield of the furnace and of simplifying its construction.
  • a first series of experiments has shown that it was possible to suppress the current circulating between the discs, by varying the voltage at the terminals of the lateral electrodes in a manner such as to bring them nearer to central electrode, in other words, operating with the same power but with a lower voltage and, consequently, with a higher intensity, which has the effect of overheating the central part of the furnace indirectly and of thus obtaining a glass which is sutficiently fluid so that the separation of the bubbles can be effected.
  • the furnace is thus considerably simplified, and its parts have a resistance to wear which is particularly beneficial.
  • the invention thus provides an electric glassmaking furnace of the type described in American Patent No. 3,147,328 which furnace is characterized especially in that the refining device comprises a single element disposed between the electrodes, this element itself not being connected to any source of voltage.
  • this element has the shape of a cup or bowl, its concavity being directed upwards, this bowl being supported by the hollow rod which constitutes the passage for withdrawing the fine glass.
  • FIG. 1 is an elevation view, in section, of the refining device according to the invention and of one of the electrodes;
  • FIG. 2 is a plan view of the refining device and of the three electrodes.
  • the refining device comprises a single refining element 101 supported by the rod 27 pierced by a passage 28 for the extraction of fine glass.
  • These parts 101, 27, 28 are preferably of molybdenum. They are centered with respect to the three melting electrodes 11a, 11b, He, supported respectively by conducting rods 9a, 9b, 90.
  • These electrodes and rods are like wise of molybdenum; the electrodes 11a, 11b, 110 have concave cylindrical faces 12a, 12b, 12c directed towards the axis of symmetry XX of the device.
  • the element 101 has the shape of a cup with an upwardly directed concavity, or preferably, the shape of a bowl with a spherical or, as shown, a conical bottom.
  • crushed molybdenum pieces 102 of, for example, of 5 to 10 mm; these regulate the absorption of the glass above the level of the bowl, and enhance the collecting of the bubbles in the numberous battles thus formed, which fact enhances the ascent of these bubbles.
  • the electrodes 9a to can be of partially fused pressed molybdenum, such as described in the patent application for Process for Manufacturing Electrodes for Furnaces for the Electric Melting of Glassware and Electrode Obtained by Carrying Out Said Process, Ser. No. 439,391, filed Mar. 12, 1965.
  • An electric glassmaking furnace comprising a trough having a chamber, a refining device disposed in the trough in the hottest region of the chamber, said device comprising means for withdrawing in the course of the continuous pouring a portion of the molten glass in said region and thus removing it from the large movements due to the convection currents prevailing in the chamber, means for subjecting said portion to a rapid rise of temperature so as to diminish the viscosity and increase the size of the bubbles which are thus separated from the fine glass, means for discharging the fine glass thus obtained to the exterior as production thereof proceeds, and means for returning to the bath inside the furnace the thus-separated bubbles, said refining device comprising a single element disposed between electrodes, said element being unconnected to any source of voltage.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Resistance Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US438574A 1964-03-17 1965-03-10 Electric glassmaking furnace Expired - Lifetime US3376373A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR967754A FR85479E (fr) 1964-03-17 1964-03-17 Four électrique de verrerie

Publications (1)

Publication Number Publication Date
US3376373A true US3376373A (en) 1968-04-02

Family

ID=8825763

Family Applications (1)

Application Number Title Priority Date Filing Date
US438574A Expired - Lifetime US3376373A (en) 1964-03-17 1965-03-10 Electric glassmaking furnace

Country Status (10)

Country Link
US (1) US3376373A (zh)
AT (1) AT259149B (zh)
BE (1) BE660952A (zh)
CS (1) CS157010B2 (zh)
DE (1) DE1258559B (zh)
ES (1) ES310671A2 (zh)
FR (1) FR85479E (zh)
GB (1) GB1096862A (zh)
LU (1) LU48194A1 (zh)
NL (1) NL142651B (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592770A (en) * 1984-06-15 1986-06-03 Gaf Corporation Glass melter
US10570045B2 (en) 2015-05-22 2020-02-25 John Hart Miller Glass and other material melting systems

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147328A (en) * 1961-05-10 1964-09-01 Verreries Phochet Et Du Courva Electric glassmaking furnace

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147328A (en) * 1961-05-10 1964-09-01 Verreries Phochet Et Du Courva Electric glassmaking furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592770A (en) * 1984-06-15 1986-06-03 Gaf Corporation Glass melter
US10570045B2 (en) 2015-05-22 2020-02-25 John Hart Miller Glass and other material melting systems

Also Published As

Publication number Publication date
AT259149B (de) 1967-12-27
BE660952A (zh) 1965-07-01
GB1096862A (en) 1967-12-29
NL142651B (nl) 1974-07-15
CS157010B2 (zh) 1974-08-23
LU48194A1 (zh) 1965-05-15
ES310671A2 (es) 1965-06-16
DE1258559B (de) 1968-01-11
FR85479E (fr) 1965-08-20
NL6503401A (zh) 1965-09-20

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