转炉二次燃烧氧枪是一项以增加废钢比为目的的热补偿技术。该氧枪喷头的副孔是直筒形,角度为30～40°,在对射流特性进行冷态实测研究的基础上,在30t转炉上进行了工业试验和应用。使用结果表明,对单流道二次燃烧氧枪副孔面积与总面积比为16.2～37.5％的条件下,废钢比可增加0.9～3.5％。当二次燃烧率提高8％左右时,计算热效率约74％。工艺可行,冶炼稳定,对转炉各项技术经济指标没带来不利影响。 Converter secondary combustion oxygen lance is a thermal compensation technology for the purpose of increasing scrap ratio. The deputy hole of the oxygen lance nozzle is a straight cylinder with an angle of 30-40 °. Based on the cold state measurement of the jet flow characteristics, industrial tests and applications are carried out on a 30t converter. The results show that the scrap ratio can be increased by 0.9-3.5% for the area ratio of secondary orifice to total area of ​​single pass secondary oxygen lance of 16.2 ~ 37.5%. When the secondary combustion rate increased by about 8%, the thermal efficiency was calculated to be about 74%. Process feasible, stable smelting, the technical and economic indicators of the converter did not bring adverse effects.