Abstract: 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.

Key words: 180 t Top and Bottom Combined Blowing Converter, Supersonic Jet, Coherent Jet, Mixed Time, Flow Rate of Gas, Oxygen Lance Position, Hydraulic Model Experiment