Influence of Immersion Depth of Ladle Shroud in Liquid Steel on Range of the Transition Zone for One-Strand Tundish During Continuous Casting of Steel

Abstract

Influence of immersion depth of ladle shroud in liquid steel on range of transition zone for one-strand tundish during continuous casting of steel Wpływ głębokości zanurzenia wylewu osłonowego w ciekłej stali na zakres strefy przejściowej dla jednowylewowej kadzi pośredniej podczas ciągłego odlewania stali AbstractThis article presents the results of a computer simulation of the flow of liquid steel through a onestrand tundish. In this paper, we examine four immersion depths of a ladle shroud in liquid steel. The simulation was performed for a sequence of slab castings. The effect of the calculations were residence time distribution curves (RTD), type (F). Based on the distribution curves, the range of the transition zone for the different variants of the immersion depth of a ladle shroud were estimated. Based on the results of numerical calculations, it was found that increasing the immersion depth of the ladle shroud in liquid steel influences the range of the transition zone. For numerical simulations of the flow of liquid steel, the Ansys-Fluent program was used. Keywords: sequence casting, tundish, ladle shroud, numerical modeling, transition zone Streszczenie W artykule przedstawiono wyniki symulacji komputerowej przepływu ciekłej stali przez jednowylewową kadź pośrednią. W pracy rozpatrzono cztery głębokości zanurzenia wylewu osło-nowego w ciekłej stali. Symulację wykonano dla sekwencji odlewania wlewków płaskich. Efektem obliczeń było uzyskanie krzywych czasu przebywania RTD (Residence Time Distributions) typu (F). Na podstawie rozkładu krzywych oszacowano zakres strefy przejściowej dla poszczególnych wariantów głębokości zanurzenia wylewu osłonowego. Na podstawie wyników

Influence of Ladle Shroud and Change in Its Position on Liquid Steel Flow Hydrodynamic Structure in Six-Strand Tundish

“…The turbulent kinetic energy and dissipation rate of the kinetic energy on the inlet were calculated at 0.07496 m 2 ·s −2 and 0.82103 m 2 ·s −3 , respectively. The physicochemical properties of liquid steel are described in work [1]. In each of the tested cases, the plane simulating the steel/tundish powder boundary was characterized by a zero tangential stresses wall.…”

“…The neuralgic stage during this process is the moment of mixing in the tundish two different steel grades in terms of chemical composition, which is defined by the range of the transition zone. Solutions aimed at reducing the time of the transition zone are constantly being searched, which minimizes the number of cast ingots (slabs, billets, or blooms) that do not meet grade standards [1][2][3]. The tundish is included in the group of flow reactors in which the hydrodynamic structure analysis consists on determining the volume of the plug, ideal mixing, and stagnant flow, which are described in detail in work [4].…”

“…A known way to improve the liquid steel flow hydrodynamic structure is the modification of metal flow streams in the tundish working space using flow control devices FCD [5][6][7][8][9]. According to articles [1,10,11], an FCD can identify the ladle shroud that influences the liquid steel flow in the tundish through modifying the main supplying stream. The use of the new FCD under industrial conditions is preceded through simulation research of the continuous steel casting process.…”

“…The use of the new FCD under industrial conditions is preceded through simulation research of the continuous steel casting process. Numerical simulations that reflect the actual liquid steel flow in a tundish have been widely used [1,12,13]. The computer calculation results after applying a previously verified mathematical model allow us to get to know the full view of the metal movement hydrodynamic structure in the working volume of the tundish and ladle shroud.…”

Online tool based on Tundish steel CFD model to monitor and minimise steel intermix in CC slabs

“…Different approaches are used and detailed in literature to minimize intermixing effects [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. They have been targeted at improving operating conditions and/or layout, even with suitable tools (e.g., particular ladle shroud geometry).…”