Electrically-heated melting furnace with a cooling trough

Details Electrically-heated melting furnace with a cooling trough Electrically-heated melting furnace with a cooling trough

C - Chemistry, Metallurgy

03

B

307/1, 49/56

C03B 5/02 (2006.01)

Patent

CA 1048273

ABSTRACT OF THE DISCLOSURE An electronically-heated, glass melting furnace with a cooling trough and with cooling means for the trough is provided. The furnace is heated by means of electrodes immersed in molted glass in the furnace; particularly as the throughput of the furnace increases, the molten glass becomes hotter. To overcome this, the cooling trough is provided in a portion of the furnace bottom, extending beyond a throat to a riser, with the bottom and the side walls of the trough being exposed to ambient temperatures below the furnace. The resulting heat loss aids in cooling the glass flowing out of the furnace to overcome the inherent heat rise at high throughputs. Cooling means are also provided extending along the trough, with the rate of cooling achieved thereby being capable of selective control. Specifically, an air duct extends along the cooling trough and has outlets spaced therealong directed at the trough bottom to supply cooling air in heat exchanges relationship with the bottom. Electrodes also can extend upwardly through the trough bottom into the trough, the electrodes serving to further cool the trough by providing heat conductive paths from the trough to the ambient conditions below the furnace. The trough electrodes, if desired, can also be heated by an emergency power supply to prevent glass from solidifying in the trough in the event that a major power failure should occur and power to the main heating electrodes is off.

218380

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