Patent ID: 6084902
Filing Date: 2000-07-04
Classification: F27B,F27D

Abstract:
An electric arc furnace comprising:a substantially cylindrically configured melting vessel having an upper shell defining a top opening; anda water-cooled roof assembly supported by the upper shell and positioned over the top opening, wherein said water-cooled roof assembly is removed from the top opening for permitting the charging of scrap into the melting vessel, said water-cooled roof assembly further comprising:an annular configured, outer roof panel having an inner ring support member defining a central opening, an outer ring support member supported by the upper shell, and at least one cooling pipe forming a concentric series of water cooling pipes extending inward from the outer ring support member to the inner ring support member;an annular configured, inner roof panel positioned within the central opening of said outer roof panel and removably mounted on the outer roof panel such that said inner roof panel is removed from the outer roof panel, said inner roof panel having at least one water cooling pipe and forming a concentric series of water cooling pipes extending inwardly, said inner roof panel including a central opening;a central refractory removably mounted within the central opening of the inner roof panel; andat least one electrode mounted in the central refractory and extending into the melting vessel.