PHYSICAL AND MATHEMATICAL MODELS OF GAS-LIQUID DYNAMICS IN BOF CONVERTERS

摘要

Water modeling experiments to study the physical interaction between oxygen and steel in LD converters have been carried out in this work and the conclusions reached are as follows: 1. Top blowing yields three zones, which depend on the lance height and gas flow rate; penetration with small splashing, splashing with a high intensity of this phenomenon and dimpling with small splashing. 2. During top blowing mixing time increases with bath height and lance distance from the bath surface. Although, gas flow rate decreases mixing time due to the increase of momentum imparted to the bath. 3. The computing VOF model is suitable to model the unsteady nature of the bath surface during top blowing. The bath surface suffers a cyclic rippling-waving deformation due to the impact of gas in the crater and the shear stresses exerted by gas on the liquid at the interface. Modified Froude number is important to characterize the penetration depth of the gaseous jet in the crater. 4. Mixing time during bottom injection decrease with bath height, number of tuyeres and gas flow rate. In combined mixing the increases of lance distance from the its tip to the bath surface, increase also the mixing time for some given conditions of bottom injection.