Study of the Influence of the Angle Between the Bottom Blowing Elements on the Dynamic Conditions in a 300t Converter

摘要

In this paper, the converter steelmaking process is studied using numerical simulations and hydraulic model experiments, in order to examine the influence of the angle between the bottom blowing elements and the gas flow rate, on the flow characteristics of the molten pool. A 300t converter is used. The results demonstrated that the mixing time and velocity field distribution, of the molten pool, changed with the angle between the bottom blowing nozzles. Increasing the bottom blowing gas flow rate improved the dynamic conditions of the bath, accelerating the mass transfer process and reducing the volume fraction of the dead zone. Two arrangements with angles of 90° and 105° were applied to two furnace regimes. The industrial experiments showed that a large angle between the nozzles was favorable because it accelerated the decarburization and dephosphorization. This reduced the endpoint carbon-oxygen equilibrium of molten steel and reduced the content of iron oxide and TFe in the endpoint slag.