CFD Investigation of Effect of Multi-hole Ceramic Filter on Inclusion Removal in a Two-Strand Tundish
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ng process, the tundish, an intermediate container located between ladle and mold, is aimed to regulate the flow of molten steel from individual ladles to the mold at a near constant rate. It is recognized that tundish plays a vital role in affecting not only the performance of the continuous casting machines but also the cleanliness of the molten steel.[1]
QIANG WANG, YU LIU, AO HUANG, WEN YAN, HUAZHI GU, and GUANGQIANG LI are with the State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, P.R. China and also with the Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, P.R. China. Contact e-mail: [email protected] Manuscript submitted September 16, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS B
In response to the growing requirements of steel product consumers, especially with respect to the steel metallurgical purity, a variety of refining methods such as induction heating, mechanical stirring, and gas injection have been applied to the tundish for removing non-metallic inclusions.[2–9] Regardless of these efforts, the technologies mentioned above cannot provide optimal conditions for efficient inclusion removal, particularly the removal of the inclusion smaller than 50 lm, since the contribution of the buoyancy of the inclusion less than 50 lm to the removal is quite limited.[10] A multi-hole ceramic filter was proposed to improve the elimination of the inclusions in the tundish.[11,12] When the molten steel travels through the ceramic filter, the flow streamlines would be distorted by the filter holes because of the sudden reduced flow area as shown in Figure 1.[13] As a result, the inclusions moving along with the molten steel would be separated from the main stream of the molten steel, tending to contact with the internal surface of the filter hole, and finally be trapped
Fig. 1—(a) Schematic of flow streamlines and inclusion absorption in filter hole, and (b) SEM image of Al2O3 inclusion trapped by microporous refractory.
by the ceramic filter which is normally made by microporous refractory.[14] Since the buoyancy function becomes slighter, the removal of the inclusion is supposed to be improved through the application of the ceramic filter, especially the smaller inclusion. The removal efficiency is mainly determined by the properties of the internal surface of the filter hole, the structure of ceramic filter, and the flow pattern.[15] In order to promote the inclusion removing of the ceramic filter, it is necessary to gain a deeper insight into the flow character as well as the inclusion movement in the tundish with ceramic filter. The motion trajectory of the inclusion in the tundish however cannot be assessed through experiment, due to high temperature, opaque container and harsh environment. Besides, the velocity and temperature fields of the molten steel, which significantly affect the inclusion removal, are also difficult to be measured.[16] With the dev
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