Fluid Flow and Heat Transfer in a Tundish with Channel Induction Heating for Sequence Casting with a Constant Superheat Control

doi:10.11900/0412.1961.2020.00194

Acta Metall Sin

2020, Vol. 56

Issue (12): 1629-1642 DOI: 10.11900/0412.1961.2020.00194

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Fluid Flow and Heat Transfer in a Tundish with Channel Induction Heating for Sequence Casting with a Constant Superheat Control

TANG Haiyan(

), LI Xiaosong, ZHANG Shuo, ZHANG Jiaquan

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

TANG Haiyan, LI Xiaosong, ZHANG Shuo, ZHANG Jiaquan. Fluid Flow and Heat Transfer in a Tundish with Channel Induction Heating for Sequence Casting with a Constant Superheat Control. Acta Metall Sin, 2020, 56(12): 1629-1642.

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Abstract

Casting with superheat control is important in improving the quality and stability of steel products and reducing metallurgical defects. In recent years, the channel-type induction heating tundish is among the new technologies that have been used by the steel industry. It exhibits an effective liquid steel temperature control during continuous casting. However, in such technology, the fluid flow and heat transfer are significantly different from those in a conventional tundish. This is because of the implementation of the heating practice and action of the electromagnetic force. In this work, a mathematical model of electromagnetic-thermal-flow coupling is developed to investigate the feature of the electromagnetic force, fluid flow, and heat transfer in a six-strand H-type induction heating tundish. The flow field and temperature field characteristics in the tundish under different application modes of induction heating are compared. Moreover, the applicability of the traditional method of cold water modeling to the structure optimization of tundish with induction heating is discussed. The results indicate the eccentric distribution of the electromagnetic force in the tundish channel, pointing to the eccentric position of the channel. Additionally, the results suggest that the molten steel in the channel flows out with rotation. For case A0, an increase of 22 K in the molten steel temperature is observed after heating for 1500 s at 1000 kW power, compared with that without heating. However, due to the pinch effect of the electromagnetic force, the short-circuit flow at the outlets near the channel intensifies, and the flow consistency in tundish worsens. Compared optimized case A4 with the prototype case A0, the short-circuit flow of the outlets near the channel disappears, the temperature difference among the different flows is reduced, the flow consistency in the whole tundish is improved, and the heating rate is increased. The present study also demonstrates that the tundish structure optimization method under a cold state is still an important evidence for the induction heating state.

Key words: induction heating tundish electromagnetic force temperature field flow field structural optimization

Received: 03 June 2020

ZTFLH:

TF777

Fund: National Natural Science Foundation of China(51874033);National Natural Science Foundation of China(U1860111);Natural Science Foundation of Beijing(2182038)

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	Haiyan TANG
	Xiaosong LI
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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00194 OR https://www.ams.org.cn/EN/Y2020/V56/I12/1629

Fig.1 Schematics of the induction heating (IH) tundish structure

Table 1 Geometrial and operating parameters of the IH tundish

Fig.2 Top views of the tundish grid models for cases A0 (a) and A4 (b)

Table 2 Material parameters and boundary conditions for numerical simulation^[14,17,23]

Fig.3 Multi-physics coupling calculation process for the IH tundish (k—turbulence kinetic energy, ε—turbulent dissipation,MHD—magnetohydrodynamics)

Fig.4 Comparisons of residence time distribution (RTD) curves between numerical (a) and water modelling^[20] (b) for case A4 ( $θ$ —dimensionless time, E( $θ$ ) —dimensionless concentration)

Fig.5 Comparisons of magnetic induction intensity at Y direction between numerical simulation and reference measurement^[30](B_x—magnetic induction intensity in x direction )

Fig.6 Magnetic field numerical simulation result at Z=-4 cm section

Fig.7 Electromagnetic force (F_mag) distribution in the induction heating channels

Fig.8 Electromagnetic force distribution in channel sections of tundish

Fig.9 Comparisons of the flow streamline in tundish

Fig.10 Comparisons of velocity vector in channel longitudinal sections

Fig.11 Velocity vector diagram in X2-L section

Fig.12 Temperature fields in X2 section at different moments with 1000 kW heating power

Fig.13 Temperature fields of the outlet longitudinal section

Fig.14 Velocity vector diagrams along channel longitudinal section at different moments for cases A0 (a1~d1) and A4 (a2~d2) with 1000 kW heating power (Ellipses in Fig.14d1 represent circulating flows)

Fig.15 Velocity vector diagrams on longitudinal section of outlet centre at different moments for cases A0 (a1~d1) and A4 (a2~d2) with 1000 kW heating power

Fig.16 Temperature distributions on channel longitudinal section at different moments for cases A0 (a1~d1) and A4 (a2~d2)with 1000 kW heating power

Fig.17 Temperature distributions through outlet center section at different moments for cases A0 (a1~d1) and A4 (a2~d2) with 1000 kW heating power

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