C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 4/08 (2006.01) C21C 5/52 (2006.01) F27B 3/08 (2006.01) F27B 3/20 (2006.01) F27B 3/22 (2006.01) F27D 99/00 (2010.01) F27D 23/00 (2006.01)
Patent
CA 2122877
- 20 - ABSTRACT Electric arc furnace with alternative sources of energy, which functions with direct current or alternating current and comprises means to inject pure or combined oxygen above the bath (16) by means of lances (12) and below by means of a plurality of tuyeres (13) positioned in the hearth of the furnace (10), 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), means (15) being included to introduce additives and/or 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 an electric furnace, the furnace comprising means to inject pure or combined oxygen above the bath (16) by means of lances (12) and below by means of a plurality of tuyeres (13) positioned in the hearth of the furnace (10), 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), means (15) being included to introduce additives and/or powdered coal, the charging operation with each single charge (skip) being 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 - 21 - the working of the furnace (10).
Coassin Giovanni
de Cecco Corrado
Gensini Gianni
Gerussi Sergio
Danieli & C. Officine Meccaniche S.p.a.
Goudreau Gage Dubuc
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