Abstract: The design parameters of swirl oxygen lance nozzle are evaluated by cold gas jet experiment, which also provides a reasonable reference for the operation of converter oxygen lance. Based on the industrial test, the parameters of swirl oxygen lance nozzle are revised, and the optimum holes of swirl oxygen lance nozzle for 120 t and 150 t converter at Laigang are finally determined. The optimum nozzle angle is 13° and the swirl angle is 6.5°～7°. While giving full play to the superiority of the swirl oxygen lance in slagging and slag splashing, the serious problem of corrosion in molten pool is solved, which makes the swirl oxygen lance widely used in medium and large converters. Using this swirl lance nozzle, especially in the case of large scrap steel ratio, the slagging effect of converter process is obviously improved, the oxygen utilization rate is improved, and the blowing time can be effectively shortened by more than one minute. When slag splashing, the slag accumulation effect in the molten pool is remarkable, the slag splashing effect is obviously improved, and the converter service life is obviously promoted.

Key words: High efficiency and energy saving, swirl oxygen lance, converter, slag splashing furnace protection