Forehearth for glass furnace

Glass manufacturing – Gathering or drawing pool type furnace – Supplemental heating or heat exchange means associated with...

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Details

65346, 65347, C03B 502, C03B 522

Patent

active

040690326

ABSTRACT:
A forehearth for a glass furnace includes a roof having a plurality of longitudinal ridges depending therefrom. These define a central longitudinal channel lengthwise of which a current of cooling air flows between inlet and outlet ports to cool the central, hottest portion of the stream of glass in the forehearth, and side channels which serve to reheat the side portions of the stream of glass. A plurality of longitudinally spaced electrodes are suspended from the portions of the roof over the side channels and are inserted in the molten glass to directly heat the side portions. Advantageously the electrodes in one side channel are energized in pairs independently of the electrodes in the other side channel. Preferably the electrode assemblies are mounted in apertures extending through the roof. Molybdenum electrodes with air cooled tubular holders encircled by refractory tubes and isolated from ambient air are described.

REFERENCES:
patent: 1557148 (1925-10-01), Ferngren
patent: 1879718 (1932-09-01), Soubier
patent: 1970113 (1934-08-01), Wardley
patent: 2471531 (1949-05-01), McIntyre et al.
patent: 2658093 (1953-11-01), LaBurthe
patent: 2767518 (1956-10-01), Schmid
patent: 3248203 (1966-04-01), Cunningham
patent: 3582310 (1971-06-01), Avery et al.
patent: 3999972 (1976-12-01), Brax

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