Abstract: This research is based upon the 120 t steelmaking converter of Pangang Group Panzhihua Steel & Vanadium Co., Ltd. The flow state about oxygen in the lance and converter were numerically simulated by means of computer, the flow of melting steel below the action of high-speed oxygen current was also simulated. In this paper, the velocity decay with distance for different lance nozzle were simulated, the flow behavior about oxygen and melting steel under different oxygen jet were presented, the mixing time of bath under different angles of oxygen lance nozzle were  numericated. Through numerical simulation, the optimum angle parameter of the oxygen lance nozzle is 16°. According the numerical simulation, the optimized oxygen lance 536-16 has a good performance in the industrial practice.

Key words: converter steelmaking, oxygen lance, numerical simulation