Estudo Numérico Do Processo De Inertização De Distribuidores

Abstract

Resumo A prática de inertização de um distribuidor de 17,7 t para lingotamento contínuo de aços foi estudada numericamente através de um modelo matemático tridimensional não-isotérmico. O modelo considera uma única fase gasosa composta de dois componentes: argônio e ar. A turbulência foi levada em conta por meio do modelo k-ε padrão. Os cálculos foram executados utilizando o software de CFD comercial ANSYS CFX. Diferentes configurações do sistema de inertização foram simuladas. Os resultados indicaram que a configuração atual é ineficiente e novas configurações foram sugeridas. Algumas recomendações para a correta prática de inertização também são fornecidas. Palavras-chave: Inertização de distribuidor; Simulação matemática; Lingotamento contínuo; Inclusão não-metálica. A NUMERICAL STUDY OF THE TUNDISH INERTIZATION PRACTICE The inertization practice for a 17.7 tonne of steel continuous casting tundish has been studied numerically by means of a three-dimensional non-isothermal mathematical model. The model considers a single gaseous phase composed of two components: argon and air. Turbulence was accounted for with the standard k-ε model. The calculations were carried out using the commercial CFD software ANSYS CFX. Different configurations of the inertization system were simulated. The results indicated that the present configuration is ineffective and new ones were suggested. Some guidelines for the correct inertization practice are also provided.

Continuous Casting Tundish Inertization: A Comparative Study

“…The author Braga [1,6] carried out a study about a non-isothermal three-dimensional mathematical model of tundish inertization. It consists of an only one gaseous phase compound by two components: argon and air.…”

“…The tundish inertization practice involves an inert atmosphere inside the reactor in the first heat of a sequence. This technique is widely used to avoid productivity losses and metallic yield from contact between steel and air in the transient steps of the continuous casting and initial filling of the tundish [1,2]. In case the contact is allowed, the present oxygen in air reacts with steel producing non-metallic inclusions (NMIs) and consuming alloy elements and deoxidants such as aluminum, titanium, silicon and calcium.…”

“…Because of this, it is evident some industrial solutions are done for each case. On the other hand, industries can have a bad inertization process, when a project is not well conducted; these practices are raised from the lack of information about the subject [1]. In this work a review about some papers focused in the topic of tundish inertization process (mathematical, industrial and laboratory) as well as reoxidation or oxidation rates measurements was carried out aiming to provide information for best practice in industry.…”