Patent ID: 8780952
Filing Date: 2014-07-15
Classification: F27B,F27D

Abstract:
1. A roof system for an electric arc furnace, the system comprising: a frustoconical, water-cooled skew forming part of a roof of the electric arc furnace and configured for removal from the electric arc furnace, the skew including an inner circumferential surface directed toward a central axis of the skew, the skew having a distal end that forms a central opening through which material is deposited into an interior of the furnace, the distal end facing the interior of the furnace; a refractory delta having a proximal surface, a distal surface, an outer circumferential surface, and at least one aperture configured to receive at least one electrode; and a refractory lining affixed to the water-cooled skew and having an inner circumferential surface that surrounds the outer circumferential surface of the delta and an outer circumferential surface that engages the inner circumferential surface of the skew, the refractory lining extending beyond the distal end of the skew; wherein the refractory delta does not extend distally to the distal end of the skew or a distal end of the refractory skew lining.