Direct-current arc furnace having circumferential zones of varyi

Details Direct-current arc furnace having circumferential zones of varyi Direct-current arc furnace having circumferential zones of varyi

1991-08-23

1993-08-17

Reynolds, Bruce A.

Industrial electric heating furnaces

Arc furnace device

Furnace body detail

373 60, 373107, H05B 706, F27D 1110

Patent

active

052375854

ABSTRACT:
A direct current arc furnace has a furnace vessel which is surrounded by a metal shell having at least one electrode connected as a cathode, and at least one bottom contact. The bottom of the furnace consists of a lining layer which possesses electrically conducting bricks or the like, which lining layer lies on a contact plate covering most of the bottom. The contact plate forms the bottom contact connected as the anode and lies on a bottom plate. The bottom plate is equipped with a plurality of connection fittings which pass through openings in the bottom plate and are connected via electric wires to a current supplying device provided next to the furnace. For the internal deflection of the arc, at least one section of the lining layer is composed of a material which possesses a lower electrical conductivity than the lining layer in another section which is circumferentially spaced from the one section so as to form circumferentially spaced zones of varying conductivity.

REFERENCES:
patent: 4371334 (1983-02-01), Van Laar
patent: 4541099 (1985-09-01), Rappinger et al.
patent: 4550413 (1985-10-01), Lassander et al.
patent: 4577326 (1986-03-01), Bergman et al.
patent: 4637033 (1987-01-01), Buhler
patent: 4692930 (1987-09-01), Radke et al.
patent: 4805186 (1989-02-01), Janiak et al.
patent: 5052018 (1991-09-01), Meredith
patent: 5134628 (1992-07-01), Stenkvist
patent: 5173920 (1992-12-01), Bochsler et al.

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