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As an advanced nozzle and because of protective gas around the main oxygen hole, coherent jet oxygen lance can make the jet concentrated with higher kinetic energy. In this paper, a coherent jet oxygen lance is tried to be made with small oxygen holes around the main oxygen hole on the traditional oxygen lance. Flow characteristic of coherent jet oxygen lance and traditional oxygen lance are simulated by CFD software. The results show that, compared with traditional oxygen lance, the attenuation of coherent jet oxygen lance is slow on the center axis, impact depth is deep, the liquid region velocity is high in the center of molten pools, flow ability of liquid steel is good in molten pools. Coherent jet oxygen lance with the suitable lance height can replace traditional top-bottom blowing mode.

Coherent jet oxygen lance is a new type of oxygen lance. In this paper, numerical study on the jet flow of coherent jet oxygen lance was carried out with different protective gas out the circular gap around the steel supersonic oxygen lance nozzle. The simulation results showed that the protection gas density was smaller, the oxygen core length was longer. High temperature carbon dioxide and hydrogen gas had the same protection effect on the main oxygen core length. The main oxygen core length increased as the increasing of the temperature and the pressure of the carbon dioxide protection gas. The result of this paper provides a theoretical basis for the design of the coherent jet oxygen lance used in BOF.