| 摘要 |
<p>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 tuyères (13) positioned in the hearth of the furnace (10), the tuyères (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 tuyères (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. A melting operating method associated with an electric furnace is also described. <IMAGE></p> |
