Optimization of flow uniformity control device for six-stream continuous casting tundish
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ORIGINAL PAPER
Optimization of flow uniformity control device for six‑stream continuous casting tundish Xin‑gang Ai1 · Dong Han1 · Sheng‑li Li1 · Hong‑bo Zeng1 · Hui‑ya Li1 Received: 17 August 2019 / Revised: 26 November 2019 / Accepted: 27 November 2019 © China Iron and Steel Research Institute Group 2020
Abstract For a multistream tundish, the uniformity among the streams plays a significant role in the quality of molten steel. How to analyze the uniformity quantitatively and optimize structures of a multistream tundish is an important research content for a multistream tundish. A new approach was proposed to quantify the uniformity among the streams. And a physical study and a numerical study were carried out to optimize the structure of the diversion hole based on the prototype of a six-stream tundish in a steel plant. On the basis of average residence time, the uniformity of each flow was considered fully and then the optimal structure of the diversion hole was obtained by means of the comprehensive analysis of temperature field and velocity field. The results show that the optimum structural parameters adopted for diversion holes are height of 20 mm, angle of 15° and diameter of 80 mm. Keywords Multistream tundish · Uniformity · Diversion hole · Physical simulation · Numerical simulation
1 Introduction With the rapid development of continuous casting technology and the higher requirements for billet quality, tundish is no longer used only as a container to store and distribute molten steel but also can carry out various metallurgical operations, including inclusion removal, temperature and chemical composition homogenization, namely tundish metallurgy [1, 2]. For a multistream continuous casting tundish, the homogenization of overall temperature of molten steel [3–5], the removal behavior of inclusions [6–10], the flow characteristics and mixing effect [11–13] have been studied a lot, but the uniformity of each flow is less chewed over. Generally, the more the streams there are in a tundish, the greater the difference there is among them. Simultaneously, the structures of tundish and metallurgical operation can have a strong impact on the uniformity between streams. Therefore, how to improve the uniformity of each flow is an important part in the current multistream tundish researches, and the premise to improve the uniformity of a multistream * Sheng‑li Li [email protected] 1
Key Laboratory of Chemical Metallurgy Engineering Liaoning Province, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China
tundish is to find out a concrete and effective quantitative index. Knoepke and Mastervich [14] used the ratio of the peak concentrations of the RTD (residence time distribution) curves to judge the uniformity in a two-stream tundish. Xie et al. [15] analyzed the uniformity using the stagnation time, the time to peak concentration, average residence time and dead zone ratio calculated through the RTD curves which were obtained from the water simulation experiment. The above
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