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为使大型转炉的生产率达到国际先进水平,在300~350t大型氧气转炉上实现4.0~5.0m3/(t·min)的高供氧强度吹炼,设计了新的大流量氧枪喷头,并在1∶10的有机玻璃模型上进行氧射流与熔池作用的水模实验。水模实验大流量氧枪喷头的主要参数为:喷头孔数6~8个,采用双角度交错布置,喷孔倾角10°~17°,喷孔出口马赫数2.0~2.2。同时测定了枪位高度为1.8~2.6m时的熔池喷溅率、混匀时间和穿透深度。研究结果表明,大流量新喷头的喷溅量和射流对熔池的穿透深度都在转炉正常吹炼范围内,熔池混匀时间平均缩短6s,泡沫渣可将喷溅率降低50%。大流量新喷头良好的吹炼性能为大型转炉高供氧强度吹炼的氧枪喷头设计提供了可靠的数据。
In order to make the productivity of large converter reach the international advanced level, the high oxygen feed strength of 4.0 ~ 5.0m3 / (t · min) is realized on 300 ~ 350t large oxygen converter, and a new high-flow oxygen lance nozzle is designed. 1:10 plexiglass model for oxygen jet and molten pool of water experiments. The main parameters of the large flow oxygen lance nozzle in water model experiments are as follows: the number of the nozzle holes is 6-8, and the double holes are arranged in a staggered manner; the dip angle of the injection holes is 10 DEG -17 DEG; the Mach number of the exit hole is 2.0-2.2. At the same time, the ladle splashing rate, mixing time and penetration depth were measured when the gun height was 1.8 ~ 2.6m. The results show that the amount of splashes of the new nozzle and the penetration depth of the jet are both within the normal range of the converter. The mixing time of the melt pool is shortened by an average of 6 seconds and the foam slag can reduce the splatter rate by 50%. The good blowing performance of the new nozzle with large flow rate provides reliable data for the design of the lance nozzle for the blowing of high-oxygen intensity in a large converter.