Abstract: A three-dimensional model of four-hole Laval lance nozzle and converter body was established by using numerical simulation and cold water simulation to verify each other, taking a 100 t steelmaking converter in a northern steel plant as a prototype. The influence of the change of lance level on molten steel flow velocity in molten pool and the impact effect of jet flow were simulated and studied. The results show that with the increase of lance position from 1.7 m to 2.5 m, the impact capacity of molten steel in molten pool decreases and the impact depth decreases. However, with the increase of gun position, the action area of oxygen jet on molten steel is increasing. The lance position of the high Mach number lance is between 1.6 m and 2.2 m, and the impact depth of the lance is moderate. The pool mixing effect is the best. At this time, the distribution of molten steel flow velocity in the radial direction of the pool is more uniform, and the high-speed zone accounts for a larger proportion, the mixing time is shorter, and the stirring effect of molten steel at the bottom of the pool is the best.

Key words: xygen lance nozzle, high Mach number, numerical simulation, oxygen lance position, cold water modeling