Physical modeling on unsteady flow behavior of molten steel in single strand tundish
WANG De-yong1, QUAN Qi1, QU Tian-peng1, ZHOU Xing-zhi1, LI Xiang-long1, CHEN Gang2
1. Shagang School of Iron and Steel, Soochow University, Jiangsu 215137,Suzhou,China; 2. Steel Making Department, Zhangjiagang Pohang Stainless Steel Co.,Ltd., Zhangjiagang 215625, Jiangsu,China
Abstract:Aiming at the problem that the unsteady changing process significantly deteriorates the cleanliness of molten steel, a physical model with a scale ratio of 1∶2 was established to investigate the unsteady flow behavior of molten steel in a single strand tundish based on the similarity principle.The results show that the flow state of the fluid in tundish can be effectively improved by setting reasonable size dam and weir and turbulence controller under steady state condition. In the unsteady condition, when the ladle change is over and the tundish liquid level rises, the average residence time of liquid steel increases with the increase of liquid level, up to 497 s.The dead volume fraction decreases gradually with the liquid level rising, and the minimum value is 23.91%. During the whole ladle change process, the liquid level decreases and rises with the drastic fluctuation of the flow state, which eventually deteriorates the removal behavior of non-metallic inclusions in molten steel.
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