Flow field optimization and analysis on inclusion removal in elliptical ladle
To improve the removal efficiency of inclusions in the actual production process of a plant,based on the similarity principle,a water model with scale factor of 1∶7 was established for a 220 t elliptical ladle.In addition to the conventional research focus on ink tracer transport process,salt solution tracer mixing and slag eye ratio,an in-novative research was also carried out by Particle Image Velocimetry(PIV)technology on the flow velocity measure-ment in water models in the presence of oil layers.In industrial experiments,the changes of inclusions quantity in different schemes were analyzed.The flow field,mixing and inclusion removal of three schemes were comprehen-sively investigated.For blowing at a equal flow rate of 150 L/min from the A and B plugs which located on one side along the long axis(scheme 1),the tracer transport process is similar to that of eccentric single plug blowing,i.e.mixing is carried out through the strong circulating flow near the surface,and the mixing time is the lowest among all schemes.However,the slag eyes is formed by the two plumes aggregate,and the slag eye area is the largest among all schemes.For blowing at A and C plugs which arranged at 180° angle from the symmetrical center,when the gas flow rate are equal,i.e.150 L/min(scheme 2),the horizontal flow near the surface is weakened,and the overall flow velocity of the ladle decreases,but the proportion of slag eye area is still relatively high.For the same A and C plugs,when the gas flow rate are weak and differential,i.e.50 and 100 L/min(scheme 3),slag eye area is significantly reduced,which can reduce the secondary oxidation.Due to the influence of surface slag layer(oil lay-er),the flow near the surface is enhanced,which is conducive to the removal of inclusions.In industrial experi-ments,scheme 1 and scheme 3 were investigated.Compared to scheme 1,extending the soft stirring time of scheme 3 can significantly reduce the inclusions which is larger than 10 μm.In summary,the function of mixing and removal of inclusions in the ladle cannot be achieved simultaneously,and further research is required.
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