Abstract
A tundish is a device from which liquid steel is pour into a mold. Therefore tundish hydrodynamic conditions have a significant impact on solidification during continuous steel casting (CSC) process. Modification of ladle shroud workspace, allows for the modification of liquid steel movement in the tundish. In the following work, numerical simulations were performed which allowed the impact of the modification of the ladle shroud workspace on the liquid steel flow structure in a one-strand tundish to be determined. In order to assess the impact of the modification of the ladle shroud on the behavior of the liquid steel in the tundish, simulations were performed, on the basis of which the percentage share of stagnant, ideal mixing and plug flow zones were determined. In addition, the mixing parameters were determined, allowing the estimation of casting duration during sequential casting. The flow fields of liquid steel for each modification of the ladle shroud were performed. The average velocity of liquid steel flowing through the tundish, the Reynolds number and turbulent intensity were also described. The obtained results showed, among others, that the application of three cylinders with a diameter of 0.041 m into the ladle shroud with a diameter of 0.11 m increases the share of active flow in the tundish in relation to the tundish with Conventional Ladle Shroud. At the same time, applying a ladle shroud with a diameter of 0.11 m during casting is the most favorable in relation to the hydrodynamics of the tundish.
Highlights
A tundish is one of the devices that shapes the hydrodynamics of the liquid steel flowing through a given work space, affecting the chemical homogenization of liquid steel or the content of non-metallic inclusions in continuous slabs, blooms or billets
This paper presents the results of numerical simulations concerning the modification of aladle shroud for a one-strand tundish
In each of the variants, there is a recirculation located at the ladle shroud, under the free surface of the liquid steel, which differs in shape and size depending on the ladle shroud variant (Plane A, rectangle 4 at Fig. 2a, Fig. 2c, Fig. 2d and Plane A, rectangle 3 at Fig. 2b)
Summary
A tundish is one of the devices that shapes the hydrodynamics of the liquid steel flowing through a given work space, affecting the chemical homogenization of liquid steel or the content of non-metallic inclusions in continuous slabs, blooms or billets. It is important to test different types of tundish [1,2,3,4,5,6,7,8,9], including those optimized by blowing the liquid steel with an inert gas [10,11,12,13] or heating it in the tundish by means of induction [14,15] Flow control devices, such as weirs, dams [16,17,18] or turbulence inhibitors [9, 19] are most often used to modify the hydrodynamic conditions in a tundish. This paper presents the results of numerical simulations concerning the modification of aladle shroud for a one-strand tundish
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