基于恒过热控制的感应加热中间包内钢水的流动与传热

doi:10.11900/0412.1961.2020.00194

金属学报

2020, Vol. 56

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

本期目录 | 过刊浏览

基于恒过热控制的感应加热中间包内钢水的流动与传热

唐海燕(

), 李小松, 张硕, 张家泉

北京科技大学冶金与生态工程学院北京 100083

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

引用本文:

唐海燕, 李小松, 张硕, 张家泉. 基于恒过热控制的感应加热中间包内钢水的流动与传热[J]. 金属学报, 2020, 56(12): 1629-1642.
Haiyan TANG, Xiaosong LI, Shuo ZHANG, Jiaquan ZHANG. Fluid Flow and Heat Transfer in a Tundish with Channel Induction Heating for Sequence Casting with a Constant Superheat Control[J]. Acta Metall Sin, 2020, 56(12): 1629-1642.

全文: PDF(3704 KB) HTML

摘要:

通过建立电磁-热-流动耦合数学模型，研究了一种六流H型通道感应加热中间包内电磁力的作用特点、钢水的流动及传热规律。对比了感应加热不同应用模式下中间包内流场和温度场特点，探讨了传统冷态水模拟研究方法对该感应加热中间包结构优化的适用性。结果表明，感应加热中间包通道内电磁力呈偏心分布，方向指向通道偏心位置，钢液在通道内旋转流出。裸包方案下，开启感应加热1500 s时比未开启中间包内1号水口处钢水温度高22 K；由于电磁力作用使通道附近水口的短路流加剧、各流一致性变差。但中间包结构优化后，通道附近水口短路流消失，各流温差降低、一致性改善、升温速率加快。模型研究结果揭示了这种新型中间包的冶金机理，同时也表明基于冷态模拟的中间包结构优化方法仍可作为感应加热中包结构设计和优化的重要依据。

关键词 ：感应加热, 中间包, 电磁力, 温度场, 流场, 结构优化

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

收稿日期: 2020-06-03

ZTFLH:

TF777

基金资助:国家自然科学基金项目(51874033);国家自然科学基金项目(U1860111);北京市自然科学基金项目(2182038)

作者简介: 唐海燕，女，1970年生，教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00194 或 https://www.ams.org.cn/CN/Y2020/V56/I12/1629

图1 H型感应加热中间包结构示意图(a) case A0 (b) channel section (c) case A4

表1 感应加热中间包几何尺寸和操作参数

图2 中间包计算模型网格俯视图Color online

表2 材料参数和边界条件[14,17,23]

图3 感应加热中间包多物理场耦合计算流程

图4 A4方案数值模拟与水模拟实验[20]时间停留分布(RTD)曲线对比

图5 Y方向磁感应强度的数值计算与测量结果[30]对比(a) left channel (b) middle channel

图6 Z=-4 cm通道截面上磁场分布的数值模拟结果(a) left channel (b) middle channel

图7 中间包感应加热通道内电磁力分布Color online

图8 感应加热左通道截面电磁力分布Color online(a) X1-L section (b) X2-L section

图9 有无感应加热2种工况下中间包流线对比Color online(a) without induction heating (b) with induction heating (1000 kW, 200 s)

图10 有无感应加热时通道纵截面速度矢量图对比Color online(a) without induction heating (b) with induction heating (1000 kW, 200 s)

图11 通道X2-L截面速度矢量图(a) without induction heating(b) with induction heating (1000 kW, 200 s)

图12 1000 kW加热功率下加热不同时间时X2截面温度场Color online(a) 200 s (b) 500 s (c) 1500 s (d) 3000 s

图13 开启及未开启感应加热中间包水口纵截面温度场Color online(a) without induction heating (b) with induction heating (1000 kW, 3000 s)

图14 1000 kW加热功率下A0和A4方案不同时刻通道纵截面速度矢量图Color online(a1, a2) 200 s (b1, b2) 500 s (c1, c2) 1500 s (d1, d2) 3000 s

图15 1000 kW加热功率下A0和A4方案不同时刻水口中心截面速度矢量图Color online(a1, a2) 200 s (b1, b2) 500 s (c1, c2) 1500 s (d1, d2) 3000 s

图16 1000 kW加热功率下A0和A4方案不同时刻的通道纵截面温度云图Color online(a1, a2) 200 s (b1, b2) 500 s (c1, c2) 1500 s (d1, d2) 3000 s

图17 1000 kW加热功率下A0和A4方案不同时刻水口中心位置温度云图Color online(a1, a2) 200 s (b1, b2) 500 s (c1, c2) 1500 s (d1, d2) 3000 s

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