Electric glass melting furnace

Details Electric glass melting furnace Electric glass melting furnace

1983-07-11

1985-01-01

Truhe, J. V.

Industrial electric heating furnaces

Glass furnace device

Joule effect heating

373 76, C03B 5027

Patent

active

044919514

ABSTRACT:
A glass heating method and apparatus, such as a glass melting furnace or a forehearth, utilizing a refractory lining and electrically energized heating electrodes. The refractory lining is an erosion resistant material, preferably a chromic oxide refractory, having an electrical resistivity which is less than the resistivity of the molten glass, preferably an E glass, which is being heated. To avoid short-circuiting through the low resistance refractory, the refractory interposed between electrodes of opposite polarity is cooled to a temperature less than the temperature of the molten glass and at which the resistivity of the refractory is materially increased. Where the electrodes of opposite polarity are carried by opposing side walls, the end and/or side walls of the apparatus are cooled. Where the electrodes are all carried by a single wall, that wall is cooled.

REFERENCES:
patent: 3806621 (1974-04-01), Machlin
patent: 4107450 (1978-08-01), Costin
patent: 4366571 (1982-12-01), Palmquist
patent: 4375449 (1983-03-01), Siddall

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