Furnace outlet

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C - Chemistry, Metallurgy

03

B

49/53

C03B 5/26 (2006.01) C03B 5/027 (2006.01) C03B 5/167 (2006.01)

Patent

CA 1067700

FURNACE OUTLET Abstract of the Disclosure A furnace for melting glass is provided with an outlet having a two-stage orifice. The struc- ture defining the inner orifice adjacent the interior of the furnace through which molten material passes in its initial stages of withdrawal from the furnace is made of a refractory metal to withstand the high temperatures present within the furnace. The outer structure defining the outer orifice acts as a shield to prevent the oxidation of the refractory metal structure through contact of the refractory metal with the atmosphere. The structure defining the outer orifice is insulated from hotter portions of the outlet and includes a fluid cooled jacket to maintain the structure defining the outer orifice be- low a temperature at which it will undergo rapid deterioration.

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