Simulation Study On Vortex Behavior In Double Nozzles Ladle During Teeming Process

Ladle as an important part of metallurgical process,The phenomenon of swirling slag at the end of pouring will cause pollution to molten steel and affect billet's quality.It is one of the important steps in clean steel production to adopt effective measures to prevent swirling to reduce the amount of slag and increase the rate of metal recovery.In the previous study,the author found that the use of double nozzle casting has a better inhibition effect on the vortex.In this paper,a water model and a numerical model are established based on the conditions of a 70 t ladle in a steel plant.The formation and evolution process of double nozzle pouring vortex is analyzed,and the inhibition mechanism of vortex when double nozzle pouring is used is discussed.The influences of nozzle distance,static time and initial disturbance on the critical height of vortex are studied.The results show that:(1)A vortex is generated in the pouring process of double-nozzle ladle.At the end of casting,two swirls with the same direction of rotation gradually form.And the opposite flow of fluid between the two vortices slows down the rotation,Suppresses the vortex.(2)When the distance between two nozzle is 0.12 m,The formation height and critical height of vortex are reduced by 38.6% and 26.3%,respectively,compared with the same area of single nozzle.(3)The formation height of vortex generated by double nozzle ladle pouring is38.6% and the critical height is 26.3% lower than that of single nozzle ladle pouring with the same area.(4)When the standing time increased from 10 min to 60 min,the critical height of the vortex decreased by 35.3%.