Power increase of supersonic jets in oxygen converter

Numerical studies targeted to increasing power supersonic jets in oxygen converter during slag splashing process have been presented in this paper. The calculations are based on a special design of the gas-cooled lance, in which the structure was simplified, as compared with a water-cooled lance. Importantly, the sprayed slag with nitrogen and magnesium-containing (MgO) powder were used in the study. The maximum heating temperature in lance nitrogen was equal to 493 °C. The work was preceded by laboratory studies conducted for convertor slag received in one of the European plants. The analysis of the computation results shows that the cooling of the lance with gas leads to the heat recuperation, which increases the temperature of the injected mixture, so that the kinetic energy of the outflowing jet in the converter increases about 3.5 times, and the slag is splashed higher than in the case of a conventional water-cooled lance.