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Study on Optimization of Flow Control Devices in Eight-Strand Tundish

Author: PengZuo
Tutor: ShenQiaoZhen
School: Wuhan University of Science and Technology
Course: Iron and steel metallurgy
Keywords: Tundish Flow control devices. Physical Simulation Numerical Simulation Optimization
CLC: TF777
Type: Master's thesis
Year: 2009
Downloads: 104
Quote: 1
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Abstract


Tundish metallurgy is an important part of its metallurgical role in the continuous casting process is to adjust the flow of molten steel flow control device by setting state, in order to achieve a uniform temperature and the promotion of non-metallic inclusions floating effect. To this end, many investigators using the method of numerical computation and the water model experiment, the flow of liquid steel in a tundish and its control. To the middle of the eight-strand caster of a steel package for study, the use of physical and numerical simulation method tundish flow control devices in the system, and quantitative analysis and research, optimization of tundish flow control devices. Physical simulation using the experimental technique of \under the conditions of the tundish piston flow zone (Vp), full Francis (Vm) and deadband (Vd); numerical simulation using the k-ε two-equation model, application the PHOENICS business software calculated the tundish molten steel three-dimensional flow field. Analysis of the impact plate, diversion wall flow field flow control element. Discuss the flow characteristics of the molten steel flow control devices before and after optimization, temperature distribution and streamline distribution. The results show that, in the case of a flow control device, the tundish long and narrow, self-injected into the outlet at the beginning, the flow of molten steel flow by 1,2 # outlet then 3 # 4 # outlet. Will inevitably lead to the retention time between each outlet, the pouring temperature greater difference, which directly affect the quality of the billet. In order to optimize the flow field inside the tundish, tundish rational design of flow control devices. The optimized conditions of the flow control apparatus, the tundish increase an impact zone, to improve the fluid flow characteristics within the tundish, to extend the liquid steel into the # 1 stream and the stream # 2, so that the residence time of each of the flow in the tundish. consistent. Injection flow through a plurality of recirculation zone is conducive to the homogenization of the composition and temperature, is also conducive to the floating inclusions removed. The calculations show that each spout optimized tundish molten steel temperature of the stream export around 1495 ~ 1498 ℃ temperature difference is very small. The four outlet fluid flow characteristics similar to the less response time, residence time and peak, the tundish dead volume of only 5.6%. Slag experiments show that the optimized flow under conditions of flow control devices will not cause the phenomenon of slag, and help to improve the continuous casting tundish rate, and improve the quality of the slab.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
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