漩流氧枪应用于转炉炼钢的水模试验研究

Water model study on converter steelmaking with nozzle-twisted lance

氧枪在转炉冶炼过程供氧、造渣、熔池搅拌等方面起着十分重要的作用,其性能对于转炉冶炼进程和钢水质量的控制有着决定性的影响。通过水模型试验,研究了漩流氧枪对转炉冶炼熔池特性的影响,主要考察了漩流氧枪喷孔扭转角设计及氧枪操作参数对熔池振荡特点、冲击坑尺寸、熔池搅拌的影响规律。结果表明,相比于传统氧枪,漩流氧枪具有喷溅少、化渣快、搅拌能力强的优势。当喷孔扭转角在0°~30°时,氧枪对熔池的搅拌在喷孔扭转角为20°时达到最佳状态,此时可获得熔池最短混匀时间为20.5 s。对于传统氧枪,熔池混匀时间与冲击坑深度总体上具有单调变化关系,即混匀时间随冲击坑深度的增大而缩短;但对于漩流氧枪,二者无明显依赖关系。

In BOF steelmaking,the oxygen lance plays important roles in supplying oxygen,controlling slagging,stirring bath,and so on. Therefore,the lance performance has critical influence on the refining process and the quality of steel. On the basis of water model experiments,the influence of nozzle-twisted lance on the feature of steelmaking converter bath was studied,focusing on the effect of nozzle twist angle design and operation parameters on the bath oscillation,cavity dimensions and bath stirring. The results showed that,compared with the traditional oxygen lance,the nozzle-twisted lance had the advantages in decreasing splashing,facilitating slagging and enhancing bath stirring. Moreover,with the increase of the nozzle twist angle from 0° to 30°,the lance attained its maximum critical stirring ability to the molten bath when the twist angle of the nozzle was 20° under which the minimum mixing time was 20.5 s. For the traditional oxygen lance,the mixing time of the molten bath has a monotonic relationship with the cavity depth where the mixing time decreases with the increase of the cavity depth. However,such relationship is not found for the nozzle-twisted lance.