NUMERICAL AND PHYSICAL SIMULATION OF STEEL LADLE DRAINING OPERATION WITH DIFFERENT WELL BLOCK DESIGN
Paulo Vinícius Souza da Conceição, Carlos Antônio da Silva, Itavahn Alves da Silva, João Victor Gomes Guimarães Ananias, Alexandre Dolabella Resende
At the end of a ladle draining operation a structure called drain sink forms at the top surface of the liquid steel allowing slag carry over from the ladle to the tundish and causing metallic losses. On this study, the effect of different well block configuration on the critical height for drain sink formation (HC) was investigated using numerical and physical modeling. The modified well block configuration showed lower HC in most of the cases when compared with the standard design. It could represent almost 50% of metallic lost savings during the continuous casting process. Air injection was also investigated and increased significantly the HC value. The numerical model showed good agreement with the physical model and was used to help undertanding this behavior.
1 Hammerschmid P. Vortex formation during drainage of metallurgical vessels. Ironmaking & Steelmaking. 1984;11(6):332-339.
2 Sankaranarayanan R, Guthrie R. Slag entrainment through a “funnel” vortex during ladle teeming. In: The Metallurgical Society of the Canadian Institute of Mining and Metallurgy. Steelmaking Conference; 1992; Ontario, Canadá. Cidade: editora. p. 655-664.
3 Davila O, Morales R. Mathematical simulation of fluid dynamics during steel draining operations from a ladle. Metallurgical and Materials Transactions. 2006;37B:71-87.
4 Kato H. Quality improvement of unstable zone by ladle slag detection system for continuous casting. ISIJ International. 1992;5:54-59.
5 Zhang Q. Numerical simulation and manifold learning for the vibration of molten steel draining from a ladle. Journal of Vibroengineering. 2013;15:549-556.
6 Santos S. Estudo do mecanismo de formação de vórtice durante a etapa de vazamento do aço da panela para o distribuidor do lingotamento contínuo da CST através da modelagem física [Dissertação de mestrado]. Ouro Preto: Universidade Federal de Ouro Preto; 2006.
7 Kojola N. Prediction and disarming of drain sink formation during unsteady-state bottom teeming. ISIJ International. 2009;49:1-9.
8 Mazzaferro G. Experimental and numerical analysis of ladle teeming process. Ironmaking & Steelmaking. 2004;31(6):503-508.
9 Sankaranarayanan R. Ironmaking & Steelmaking. 2002;147:234-240.
10 Lange M. Clean steel block - new developments towards clean steel. La Revue de Métallurgie-CIT. 2003;6:577-582.
11 Morales O, Davila M. Physical and mathematical models of vortex flows during the last stages of steel draining operations from a ladle. ISIJ International. 2013;5:782-791.
12 Li W. Mechanism analysis of free-surface vortex formation during steel teeming. ISIJ International. 2014;54:1592-1600.
13 ANSYS. Turbulence and wall function theory [help system CD-ROM]. 2015.
14 ANSYS. Multiphase flow theory [help system CD-ROM]. 2015.
15 Ribeiro B. Analise numérica e experimental do processo de vazamento de aço líquido da panela de aço para distribuidores no processo de lingotamento contínuo [Dissertação de mestrado]. Belo Horizonte: Universidade Federal de Minas Gerais; 2014.