Mariotti Cardozo, Alejandro David (2010) Fluidodinamica del crisol de alto horno : Estudio experimental y numérico de una interfaz entre líquidos inmiscibles en un medio poroso / Fluid-dynamics of the blast furnace hearth: numerical and experimental study about interface behavior between immiscible liquids flowing through a porous medium. Tesis Doctoral en Ciencias de la Ingeniería, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
Debido a la complejidad que presenta la observación directa de los fenómenos que ocurren en el interior de un alto horno (AH), el desarrollo de modelos teóricos para explicar e incrementar el conocimiento de los diferentes procesos observados indirectamente, presenta un desafío constante para quienes se dedican al estudio de la reducción de minerales de hierro mediante éste método. Particularmente, en el interior del crisol se ubica un lecho de coque en el cual se encuentran estratificados dos líquidos inmiscibles: escoria y arrabio. Cuando éstos se extraen del crisol a través de una abertura perpendicular a la gravedad (colada), se produce un flujo complejo en donde la interfaz entre ellos se mueve y presenta diferentes perfiles durante una colada. Dicha interfaz tiene un rol importante en la vida útil de un AH, debido a que la escoria es un agente químicamente agresivo para los refractarios del crisol. Por otro lado, la inclinación de la interfaz en la cercanía del orificio de salida ( θ_o ), tiene influencia sobre la evolución del diámetro del orificio de colada durante una colada. Hecho que incide directamente sobre la operación del crisol. Por tales motivos, en este trabajo: • Se desarrollan una serie de experimentos para investigar la relación entre la forma de la interfaz y las variables del problema. Los resultados indican que existe una marcada correlación entre θ_o y la fracción de volumen de los líquidos en el flujo de salida. • Se realiza el estudio numérico de uno de los experimentos realizados permitiendo complementar los resultados experimentales y validar el procedimiento numérico para los estudios posteriores. • Se definen cuatro parámetros adimensionales, y mediante un estudio numérico paramétrico, se desarrolla una expresión general para predecir θ_o . Además, se reporta la influencia cualitativa de cada parámetro sobre la interfaz. • Se obtienen a partir de todos los resultados, algunas consideraciones teóricas relevantes que aportan a la comprensión del comportamiento de una interfaz entre dos líquidos. • Se presenta el impacto causado por esta investigación aplicada sobre la industria, a través de la descripción de un complejo simulador de coladas de AH desarrollado exclusivamente para una de las empresas siderúrgicas más grandes de la Argentina.
Resumen en inglés
The direct observations of different phenomena present inside a blast furnace (BF) during the operation are complex. For this reason, the development of theoretical models to explain and increase the knowledge about what is observed in an indirect way, represents a constant challenge for researchers of the BF world. Particularly, inside a BF hearth, in the coke bed, two immiscible liquids are stratified: slag and pig iron. When these liquids are extracted of the hearth through a perpendicular opening to the gravity (tap), a complex flow takes place in which the interface between the liquids moves, tilts and bends during the tap. This interface has an important role in the BF service life, because the slag is chemically aggressive for the hearth refractory lining. On the other hand, the interface tilt in the vicinity of the outlet orifice ( θ_o ), influences on the evolution of the taphole diameter during a tap. This fact, impacts directly on the hearth operation. For these reasons, in this work: • An extensive set of experiments investigating the relationships between the interface shape and the different variables of the fluid-dynamical problem were carried out. Results indicate θ_o is in relation with the slag volume fraction in the outlet flow. • A numerical study of one of the previous experiments was carried out, allowing to improve the experimental results and to validate the numerical procedure for the subsequent studies. • We define four non-dimensional parameters and, by means of a numerical parametric analysis, an equation to predict θ_o is developed. In addition, the qualitative influence of each non-dimensional parameter on the interface shape is reported. • Relevant theoretical considerations explaining the liquid-liquid interface behavior were obtained from the results. • The impact caused by this applied research on the industry is presented through the description of a complex BF tapping simulator. This apparatus was exclusively developed for one of the biggest steel companies in Argentina.
| Tipo de objeto: | Tesis (Tesis Doctoral en Ciencias de la Ingeniería) |
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| Palabras Clave: | Blast furnaces; Altos hornos; Computerized simulation; Simulación computerizada; Steelmaking furnace; Horno siderúrgico; Interface; Interfaz; Porous Medium; Medio poroso |
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| Materias: | Metalurgia > Metalurgia física |
| Divisiones: | Aplicaciones de la energía nuclear > Tecnología de materiales y dispositivos > Mecánica computacional |
| Código ID: | 170 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 13 Aug 2010 11:53 |
| Última Modificación: | 08 Feb 2012 14:07 |
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