Based on 260-ton top blowing converter of a steel works

the 1：7 physical model is established

and the interaction between the innovated double-structure oxygen lance and the molten pool is analyzed. The depth

width and stirring intensity of cavity under different impacting conditions are discussed and the results are compared with those of traditional oxygen lance. It is found that the cavity depth formed by the interaction between the new nozzle and the molten pool is almost equal to that of the traditional nozzle. At design flow and the lance height H = 35 de

the maximum cavity depth formed by the innovated nozzle is 147 mm； as compared with traditional lance at different lance height the average impact cavity diameter by innovated lance increases by 22%. The corresponding optimal operating lance position is 35 ~40 de under the design flow.