Process for increasing the energy input in electric arc furnaces

Details Process for increasing the energy input in electric arc furnaces Process for increasing the energy input in electric arc furnaces

1987-08-25

1989-05-02

Envall, Jr., Roy N.

Industrial electric heating furnaces

Plural diverse heating means

Arc

H05B 700, H05B 1100

Patent

active

048274860

ABSTRACT:
To save energy in the production of steel in an electric arc furnace while increasing the total input of energy, the employment of carbonaceous fuels and oxygen-containing gases is proposed. The oxygen or the oxygen-containing gases are led into the furnace in the upper part of the furnace through stationary top blow-in devices (4) into the space between the pitch circle of the electrodes (10) and the furnace wall (3). The resulting intense gas flow repeatedly sucks in the reaction gases arising from the scrap or the melt being formed and burns them. The heat thus set free is transferred to the scrap and/or the melt with a thermal efficiency of at least 70%. By nozzles (2) arranged below the surface of the bath, and preferably in the furnace floor, preferably oxidizing gases are led into the melt and solid materials, particularly carbonaceous fuels, are supplied to the melt through one or more hollow electrodes (6) with an abrasion-resistant cladding. With this process, increased energy input into the electric arc furnace becomes possible, and thus the melting down time can be shortened and the economy of the process improved.

REFERENCES:
patent: 3459867 (1969-08-01), Estes
patent: 3905589 (1975-09-01), Schempp et al.
patent: 4146390 (1979-03-01), Widell
patent: 4646315 (1987-02-01), Hixenbaugh et al.

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