260t转炉用新型双结构氧枪水模实验与工业应用

Water model experiment and industrial application of an innovative double-parameter oxygen lance for a 260t converter

为克服传统氧枪在转炉炼钢工艺技术中的局限性,利用水模型实验对不同结构的新型双结构氧枪与转炉熔池的作用过程进行研究,分析了新枪的大小孔倾角、大小孔流量比对冲击坑形态以及熔池搅拌强度的影响。结果表明:双结构氧枪与熔池作用形成的冲击坑独立较好;对比其他变量,小喷孔倾角对冲击坑直径的影响更大,大喷孔流量比对冲击坑深度以及熔池搅拌强度的影响更大。将双结构氧枪应用于260 t转炉并统计110炉吹炼效果发现,双结构氧枪的平均吹氧时间比目前的5孔氧枪缩短了45 s,平均供氧强度提高了0.16 m^3/(t·min),平均钢铁料消耗降低了15 kg/t,终渣成分和渣量与原5孔氧枪的差别不大。

In order to overcome the limitation of traditional oxygen lance in converter steelmaking technology,a water model experiment was used to study the interaction between the innovative double-parameter oxygen lance with unique structure and the converter bath.The influences of inclination angle of the large and small nozzles and flow rate on the cavity shape and the stirring intensity were analyzed.The results show that the cavity formed by the interaction of the double-parameter oxygen lance and the molten pool is relatively independent.Compared with other variables,the inclination angle of small nozzles has a greater impact on the cavity diameter,and the flow rate of large nozzles has a greater impact on the cavity depth and the stirring intensity of the molten pool.The double-parameter oxygen lance was applied to a 260 t converter and the statistics were obtained from the 110 heats.As a result,the average time of oxygen blowing is shortened by 45 s compared with the original 5-nozzle oxygen lance,and the average oxygen supply intensity is increased by 0.16 m^3/(t·min).The average ferrous charges consumption is reduced by 15 kg/t,but there is little difference about the final slag composition and the slag amount comparing with the original lance.