INFLUENCE OF SURFACE PRESSURE AND SLAG LAYER ON BUBBLE BURSTING IN DEGASSER SYSTEMS

摘要

With the aim of controlling steel grade in steelmaking reactors, IRSID and IMFT are developing a numerical description of the evolution of bubbles in the vicinity of a liquid steel/slag interface. The objective is to identify the main parameters affecting the hydrodynamics of the various phases. The goals of the present paper are: 1. To describe the numerical technique developed to predict the multiphase flow including bubbles, liquid metal and slag layer. 2. To analyze the influence of the absolute pressure on the bursting of bubbles in a RH degasser. Validation is given by comparison with results available in the literature. The major point concerns the distinct behaviors observed whether the pressure is low or high. 3. To study the influence of the properties of the slag layer (thickness, viscosity and interfacial tension) on the entrainment of liquid metal in the wake of the bubble and on the nature of the projections from the bath surface.