Optimization Of Tundish Flow Control Devices In T-type Five Strand Bloom By Numerical Simulations

This paper is based on technological innovation of five flow no-symmetric tundish of a steel plant, optimized design flow control device. Currently used flow control device already cannot satisfy production process requirements. used computational fluid dynamics software Fluent to simulate flow control devices by 16 different scheme. In the stable state of molten steel flow, considering the influence of natural convection, using the molten steel flow continuity equation, Momentum equations and k-εequation model, and analyses the velocity and temperature fields with and without flow control devices. Using the tracer of unsteady mass transfer process description of molten steel residence time distribution curve and quote discrete model to study liquid steel inclusions'behavior.The results showed that: it is obviously to eliminate the short circuit current and the ratio of dead reduced to 10% by optimizing scheme of setting the porous baffle tundish flow control devices, which is more increased by 63.6% than without flow control devices. Distribution area of tundish liquid steel temperature are more uniform, there is exiting the difference between the average maximum temperature of 2.16℃in each exit , the inclusions in liquid steel removal rate was 83.9% , especially, inclusions of small diameter removal rate from 20μm to 50μm is an increasing.By comparing no flow control devices with flow control devices, analysis of results show that: flow control that setting a reasonable position of flow control,hole diameter and the opening direction of hole can significantly improve the flow characteristics within the tundish, so that molten steel distribution uniform, reducing the proportion of dead zone, extending the average residence time of liquid steel, which is beneficial to enhance the removal of inclusions.