Study On Numerical Simulation Of Blowing Flow Field At Bottom Of Top And Bottom Blowing Converter

The top and bottom blowing converter was the mainstream steelmaking method.The type,count,arrangement and strength of bottom blowing gas supply elements directly affect the mixing effect of converter pool.According to the actual situation of the steel plant,through the combination of physical simulation and numerical simulation.The influence of the arrangement and air supply mode of bottom air supply elements in 300 t top and bottom blowing converter on the mixing effect of melting pool was studied.The experimental results show that:1)With the increase of air supply intensity,the mixing time of molten pool decreases first and then increases,there is a critical value whose gas supply intensity is 0.28 Nm~3/(t·min),at this time,the mixing time is the shortest and the mixing effect is best.2)Under the non-uniform air supply mode,the mixing time also varies with the distribution ratio of the bottom blow flow.The effect of the ratio of bottom blowing flow distribution on the mixing effect of converter is: 2:1 > 1:1 > 4:1 > 3:1.3)Class A arrangement is better than class B arrangement.The influence of class A arrangement on the mixing effect of converter is A1 > A2 > A3.It is recommended to choose A1 arrangement.4)The method of calculating converter flow field is optimized based on the conventional method.For the thin metal tube porous plug type plug,the influence of the porosity of the plug on the converter flow field is not considered.The introduction of the porous media model can make the simulation conditions closer to reality,the efflux velocity of porous media model is small,and the temperature field and velocity field have the same change trend.The outlet velocity of the non-porous media model was 120.85 m/s,and the outlet velocity of the applied porous media model is 110.45 m/s.5)Dead zone is distributed in the center of furnace bottom and near the furnace wall.The further from the bottom of the pool,the higher the speed.The mixing effect of molten pool can be increased by increasing the velocity of transverse flow.Figure47;Table13;Reference 60...