A model for dead volume fraction in multi-strand asymmetric tundish based on F curve
CUI Heng1,2, OUYANG Yu-ke1, WANG Ru-dong1, SU Xiao-feng3,4, LIU Jian-hua3
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Laboratory,Metallic Materials and Processing for Modern Transportation, Beijing 100083, China; 3. Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China; 4. Steelworks, Xinji Aosen Steel Group Co., Ltd., Shijiazhuang 052373, Hebei, China
Abstract：In order to solve the problem of negative dead volume fraction or bigger calculation errors when the combined model is used to calculate the residence time distribution curves of different outlets of multi-strand asymmetric tundish, the E curve obtained from “pulse stimulus-response” tests was transformed into F curve, which could be used to establish an analysis model for dead volume fraction in a multi-strand asymmetric tundish based on F curve. Meanwhile, the flow uniformity of molten steel in the whole multi-strand asymmetric tundish was also evaluated by comparing the flow concentration difference and the local maximum, global maximum difference of F curves between the different strands. This model was used to analyze the flow characteristics of four-strand asymmetric tundishes. The results show there is a slow flow area above the No.3 and No.4 nozzles in tundish without the flow control device, and the molten steel renewal in tundish is slow, and the flow field is unreasonable. With the addition of the retaining wall, the consistency of flow in tundish is enhanced, and the flow consistency of No.2 and No.3 nozzles is similar, and that of No.1 and No.4 nozzles is similar. Using the combination of retaining wall and dam 2, the consistency of each flow is the best and the proportion of dead volume fraction is the smallest.
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