Physical simulation on fluid flow consistence in tundish with asymmetric flow control device
LI Xiao-song1, TANG Hai-yan1, HU Qun1, JIANG Xian-xun2, SUN Zhi-ming2, HE Tao2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Product Development Department, Jilin Jianlong Iron and Steel Co., Ltd., Jilin 132000, Jilin, China
Abstract：Limited by the position of the top slag discharge outlet, the flow control device of two-strand slab continuous casting tundish used in a steel plant is virtual asymmetrical. The industrial practice shows that the content of large-sized inclusions in the slab on the slag discharge side is higher, and the pass rate of flaw detection in the rolling product is lower, which are suspected to be related to the fluid flow consistency in tundish. Therefore, a 1∶3.5 water model is adopted to simulate the flow field in tundish, and the flow control effect is optimized based on the principle of fluid dynamics. The experimental results show that the difference of the stagnation time of No.1 nozzle and No.2 nozzle in the prototype case reaches 36 s, and the molten steel produces a short-circuit flow at the No.1 nozzle on the slag discharge side, resulting in the difference of cleanliness between the two-strand slabs. Through water model optimization, the standard deviations of the average residence time and the stagnation time of No.1 and No.2 nozzles drop to 0.12 and 0.35 s, respectively, under scheme F1, indicating that the flow behavior consistency of the two strands in tundish has been improved. In addition, the dead zone ratio is reduced by 8.87% and the average residence time is prolonged by 30 s.
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2020, Vol. 30 
