Based on established geometric model the three dimensional numerical simulation on the effect of oxygen lance nozzle parameters (angle between nozzle 12° ~ 13°

nozzle number 4

flow rate 22000 ~ 24000 m

3

/h) of top and bottom combined blown converter tapping 110 t liquid steel on jet has been carried out by using software Fluent to get that with nozzle angle 12. 5° 4-nozzle oxygen lance at 1. 1 ~ 1. 4 m lance level the suitable radius and higher jet speed may maintain. The application practice of 93 heats 0. 45 C steel

Q235 and HRB400 steel steelmaking at steel works shows that with 12. 5° nozzle angle and oxygen flow rate 22000 m

3

/h

the average tap to tap time of 110 t liquid is 14. 8 min

the end carbon meets the requirement of melting steel grades

the end [P

]

0. 010% ~ 0.030% and the dephosphorizing rate of liquid ≥96%.