| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for operating an electric arc furnace by which the injection ratio of gas from a furnace bottom can be improved. <P>SOLUTION: The electric arc furnace, for use in melting of steelmaking raw materials, is provided with a replacement furnace bottom 31 constituted so as to be replaceable while including the center portion of the furnace bottom, and an outside furnace bottom 32 as the furnace bottom at the outside of the replacement furnace bottom 31. Before the replacement furnace bottom reaches its usable life, the replacement furnace bottom 31 is replaced once or more than once. Until replacing the replacement furnace bottom 31 at the last time, the gas is injected only from a tuyere 43 at the outside furnace bottom 32, and after replacing the furnace bottom 31 at the last time, the gas is injected from a tuyere 44 in the replacement furnace bottom 31b. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
