Research on Flow Field of Double-nozzles Bottom Blowing CAS process with Properties of Liquid Metal through Numerical Simulation

摘要

The fluid flow of liquid metal in ladles of CAS-OB refining process is a complicated turbulent transmission process. It behaves much more complicated than in traditional ladle because of immersion snorkel. This paper describes properties of liquid metal based on full buoyancy model. The author analyzes the characteristics of flow field in single and double-nozzles bottom blowing condition through numerical simulation method. Double-nozzles bottom blowing could improve blending effect in the region where is weak mixing. This paper also draws an empirical formula which tells how gas blowing and immersion depth influence mixing time in CAS-OB ladle through dimensionless analysis: (τ-τ_0)/τ_0=0.59Q~(-0.74)(H/H_L)~(0.52).