Anshan Iron and Steel Company 180 t top-bottom combined blowing converter is considered as prototype in this article

the hydraulic model tests of traditional jet and coherent jet to bath were carried on by designing supersonic jet oxygen lance . The best mixed time was 12.6 s which was obtained by traditional jet water model experiment. Hie interaction between coherent jet and bath was simulated by reducing oxygen lance position

which was carried under the condition of keeping the best top blown gas flow rate is constant. The results shown that: the mixing time was 11.8 s when the lance position was reduced to 40 mm. This showed that the coherent jet flow oxygen lance may achieve the result of top-bottom converter stirring effect. In that case

the bottom blowing system of converter could be canceled

the converter equipment can be simplified

and the converter lining life can be improved.