Importance

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Abstract

A taphole for a melting furnace includes a cylindrically shaped copper shell having a central opening through which molten material from a furnace passes and includes a reduced inner diameter portion defining an orifice. A plurality of narrow holes are formed in the shell wall adjacent the orifice but isolated therefrom and are interconnected to form a plurality of highly restrictive flow passages. Coaxially arranged about the copper shell is a coolant guide having a surface which is closely spaced from the copper thereby defining another highly restrictive flow passage which is also in communication with the plurality of passages around the orifice. A liquid coolant is supplied to the passages where the velocity of the same is made to accelerate to an ultrahigh velocity of at least 10 feet per second across nonworking surfaces of the copper shell forming parts of said passages to thereby sweep away steam generated upon the surfaces.

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First Claim