| 摘要 |
PURPOSE:To increase the burning rate of CO generated in a furnace by 15-20% as compared to the conventional lance by providing an auxiliary nozzle for secondary combustion in addition to a main nozzle for refining to a lance, forming the auxiliary nozzle into the shape at which the flow rate of injection is made to subsonic speed and separating an oxygen flow passage for the main nozzle and oxygen flow passage for the auxiliary nozzle. CONSTITUTION:The auxiliary nozzle 6 for secondary combustion is provided in addition to the main nozzle for refining to the lance for converter refining. The section of the flow passage of the nozzle 6 is formed into, for example, the divergent shape sharply expanding from a diameter d1 to a diameter d2 so that the flow rate of injection is made to subsonic speed. Said section is otherwise formed in to the shape provided internally with resistor for gas flow, etc., such as perforated plate or plate for changing the section of the flow passage. The oxygen flow passage for the main nozzle and the oxygen flow passage for the auxiliary nozzle are separately provided.
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