Abstract
With the increasing demand for high-efficient continuous casting, parameter optimization during high-speed continuous casting is critical. To clarify the changes in flow characteristics in a multistrand tundish and the optimization principles for the diversion wall, a numerical investigation of an eight-strand tundish during continuous casting of billet was carried out in this paper. The simulation results were validated with the physical results of a 1:3 water model experiment. The results show that, for a tundish with the same flow control device, the average residence time and the maximum residence time difference of liquid steel in different strands are significantly reduced with higher casting speed. At different casting speeds, the effect of the hole diameter and deflection angle of diversion wall on the average residence time and the dead region proportion is very minor, while that on the maximum residence time difference of liquid steel in different strands is significant. For a given tundish, to improve the flow uniformity among multiple strands, parameter optimization of diversion wall should be optimized when the casting speed increases. When the casting speed is 4.4 m/min, the hole diameter of the diversion wall is 80 mm, and the deflection angle of the diversion wall is 74°, the flow field parameters of liquid steel in the eight-strand tundish are good, especially flow uniformity among multiple strands.
Highlights
The core of the new generation of high-efficiency continuous casting technology is higher casting speed [1]
Computational meshes of 1.7 million, 1.9 million, and 3.4 million elements were used in the Computational Fluid Dynamics (CFD) simulation to verify the irrelevance of mesh size
When the casting speed increased from 2.8 m/min to 4.4 m/min, liquid steel in the tundish with deflection angles of 71° and 77° had a relatively large average residence time and a relatively small d(eaa) d region proportion, while that in the tundish with th(be)deflection angles of 74° and 79° had a relatively small average residence time and a relatively large dead region pFirgouFpirogeur7tr.ieoE7nff..eEcHftfoecfwthoeofvleheord,lieathmdeieatmienreftoleunreflonnocweflofiowef ldfieeplfdalerpacmatiroeantmereastneinrgslteihnsetothunentdauvinsehdriasthgdeaitfrfdeirsfeifdnerteencnactsetciantsigmtinsepgeasepndedse: ds:aa(dav)erareavggeieroarngeespirdreeosnpidcoeerntticimoeneti;ma(bte)a; d(gbei)avddeernaedgciarosentgiipnorgnopsppororetpeioodnrti.isovn.ery small
Summary
The core of the new generation of high-efficiency continuous casting technology is higher casting speed [1]. Boonpen [21] used the response time (the starting point of the residence time distribution (RTD) curve) as an evaluation index of the probability of short-circuit flow and inclusions and pointed out that an increase in casting speed by 1 m/min could reduce the minimum residence time by approximately 30% in the case of a mid-outlet, which might have a greater probability of inclusion aggregation. These results are very important to clarify the influence of the casting speed on the flow field in the multistrand tundish. According to the Froude similarity criteria, the rates of volume flow and time between the model and the prototype are shown in formulas (2) and (3), and the volume flow of the water model under different casting speeds of billet with a 160 × 160 mm section could be obtained
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