Control on flow of molten steel in a 6-strand tundish with dual channel induction heating
WANG Kai-min1, TANG Hai-yan1, XIAO Hong2, MA Zhi-min2, CHENG Yong-jiu3, ZHI Jian-guo3
1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Electromagnetic Center, Hunan Zhongke Electric Co., Ltd., Yueyang 414000, Hunan, China;
3. Chief Engineer′s Office, Baotou Iron and Steel Group Corp., Baotou 014010, Nei Mongol, China
The channel-type induction heating is a new technology for continuous casting tundish which has been adopted by steel plants in recent years, and its channel structure is usually straight-through. However, for the long and narrow multi-strand tundish, the flow and temperature distribution of molten steel in the tundish with this channel structure vary greatly among different strands, which affects the stability and consistency of casting billet quality. To solve this problem, a novel channel structure with bifurcated split channels was proposed, and the influence of channel hole size and its angle on the flow of molten steel was investigated by physical simulation based on a 6-strand tundish which needed to be modified in a domestic steel plant. The results were compared with the common channel structure. The results show that the flow uniformity of tundish can be significantly improved by the A1D case which has two apertures of 90 mm and 60 mm respectively and the retaining dam structure, and the RTD curves of each strand almost coincide. The channel structure has been applied to the industrial production of heavy rail steel in the steel plant. The quality of casting billet is stable, and the temperature difference of molten steel is controlled to 0-3 ℃. This study provides a new idea and method for the structural design of induction heating tundish and shows that traditional physical modelling method can still be used to guide the design and optimization of induction heating tundish.
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