Electric arc furnace with alternative sources of energy and oper

Industrial electric heating furnaces – Arc furnace device – Furnace body detail

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Details

373 85, 75530, 266 47, F27D 100

Patent

active

054447330

ABSTRACT:
Electric arc furnace with alternative sources of energy, which functions with direct current or alternating current and comprises at least one lance (12) to inject pure or combined oxygen above the bath (16) and a plurality of tuyeres (13) positioned in the hearth of the furnace (10) to inject oxygen below the bath, the tuyeres (13) being cooled by a peripheral movement of a cooling mixture consisting of at least one gas having a high cooling power (methane, butane, inert gases, etc.) and of at least one diluting gas (nitrogen, carbon dioxide), pipes (15) being included to introduce additives and powdered coal, post-combustion burners (28) possibly being comprised, the tuyeres (13) including an oxygen delivery pipe (18) having a diameter greater than 8 mm., the oxygen pressure being capable of being modulated according to the working steps, there being a constant minimum pressure of delivery. Melting operating method associated with such an electric furnace, wherein the charging operation with each single charge (skip) is divided into defined periods, with which are associated a pressure of delivery of oxygen through the tuyeres (13) and a percentage of gas having a high cooling power and proportioned to the rate of flow of the oxygen, there being a minimum pressure of delivery of oxygen in each moment of the working of the furnace (10).

REFERENCES:
patent: 2909422 (1959-10-01), Schwabe
patent: 3459867 (1969-08-01), Estes
patent: 3706549 (1972-12-01), Knuppel et al.
patent: 3802685 (1974-04-01), Brisse et al.
patent: 3811386 (1974-05-01), Knuppel et al.
patent: 3902889 (1975-09-01), Malin
patent: 3907549 (1975-09-01), Brisse et al.
patent: 4249719 (1981-02-01), Knuppel et al.
patent: 4749408 (1988-06-01), Tate et al.
patent: 4827486 (1989-05-01), Brotzmann et al.
patent: 5329545 (1994-07-01), Dudill et al.

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