Optimization on Bottom Blowing System of a 210 t Converter

Abstract

Bottom blowing has a significant influence on the stirring of molten steel in a combined blown converter. The effects of flow rate and configuration of bottom blowing tuyeres on the flow of molten steel inside the converter were studied with Eulerian multiphase model by using commercial software Fluent6.3, then the bottom blowing system was optimized based on the numerical simulation. The results show that the shape of the flow field of gas-steel phase zone is like an inverted cone, forming a strong center circulation and a weak circulation near the wall on both sides of the gas column because of bottom blowing. The average velocity of molten steel increases with the increase of bottom blowing flow rate. The flow pattern of molten steel changes little when the pitch circle diameter of bottom blowing tuyeres configuration changes. The molten steel has a good dynamic condition when the bottom blowing tuyeres are distributed at 0.55D (D is the diameter of the converter bottom) of the converter bottom. The simulation results were verified by industrial experiments.