According to the actual production situation of an 180 t converter

based on revised Froude number as experiment similarity number

a water model with geometrical-similar ratio 10 ： 1 is established

the four holes symmetric bottom blowing test has been carried out

and with optimum bottom blowing process parameters (the bottom blowing optimum location is nozzle at the concentric circles which diameter / converter bath diameter =0. 3

and the optimum flow rate is 0. 7 m

3

/h with mixing time 18. 2 s)

and the test of top and bottom combined blowing jet-bath interaction has also been carried out by modifying gas rate and lance level of top blowing oxygen lance. Results show that in bottom blowing condition

with increasing top blowing process ( optimum lance level 150 mm

optimum gas flow rate 39 m

3

/h) the bath average

mixing time decreases by 5. 6 s

the economic benefits of 180 t converter top and bottom combined blowing steelmaking process increases obviously.