电磁连铸过程FTSR结晶器多相传输行为的研究

许琳; 裴群武; 李阳; 韩泽峰; 杨硕; 王建宇

doi:10.7513/j.issn.1004-7638.2023.04.019

电磁连铸过程FTSR结晶器多相传输行为的研究

doi: 10.7513/j.issn.1004-7638.2023.04.019

许琳^{1, 2, ,},
裴群武³,
李阳⁴,
韩泽峰²,
杨硕¹,
王建宇¹

1.
沈阳工程学院省级洁净燃烧发电与供热技术重点实验室, 辽宁沈阳 110136
2.
东北大学冶金学院, 辽宁沈阳 110819
3.
沈阳仪表科学研究院有限公司, 辽宁沈阳 110043
4.
钒钛资源综合利用国家重点实验室, 四川攀枝花 617000

基金项目: 国家自然科学基金项目(51906163)；辽宁省博士科研启动基金项目(2022-BS-224)；辽宁省教育厅科研项目(LJKQZ20222282)。

详细信息

作者简介:
许琳，1989年出生，女，黑龙江嫩江人，博士研究生，讲师，通讯作者，主要工作方向为电磁流体力学，E-mail：lin_xu1989@163.com

通讯作者:
许琳，1989年出生，女，黑龙江嫩江人，博士研究生，讲师，通讯作者，主要工作方向为电磁流体力学，E-mail：lin_xu1989@163.com

中图分类号: TF777.1
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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-10
- 刊出日期: 2023-08-30

Investigation of multiphase transport behaviors in a FTSR mold during electromagnetic continuous casting process

Xu Lin^{1, 2
, ,},
Pei Qunwu³,
Li Yang⁴,
Han Zefeng²,
Yang Shuo¹,
Wang Jianyu¹

1.
Shenyang Institute of Engineering, Key Laboratory of Liaoning Province for Clean Combustion Power Generation and Heating Technology, Shenyang 110136, Liaoning, China
2.
Northeastern University, School of Metallurgy, Shenyang 110819, Liaoning, China
3.
Shenyang Academy of Instrumentation Science Co., Ltd., Shenyang 110043, Liaoning, China
4.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China

摘要

摘要: 为研究薄板坯连铸全幅一段电磁制动冶金效果，以漏斗形FTSR结晶器为研究对象，利用建立的三维多场数学模型，模拟全幅一段电磁制动作用下电磁参数变化对FTSR结晶器钢液流动、传热凝固及夹杂物迁移行为的影响。结果表明，施加全幅一段电磁制动后，结晶器内钢液温度分布的均匀性提高，钢液流股对熔池的穿透深度减小，这不仅利于下回流钢液夹带的夹杂物上浮去除，还促使上回流钢液将热量输送到弯月面区，避免弯月面处熔渣凝固而形成渣圈。此外，通过适当增加磁感应强度，可降低钢液表面流速，控制上吐出孔处液面波动。当磁感应强度达到0.3 T时，钢液表面最大流速降低至0.27 m/s，上吐出孔处液面峰值降低至7.3 mm。
- 连铸 /
- FTSR结晶器 /
- 电磁制动 /
- 钢液流动 /
- 传热凝固 /
- 夹杂物迁移
Abstract: For the research object of flexible thin slab rolling (FTSR) funnel-shaped mold, a three-dimensional (3-D) multi-field coupling mathematical model was established for describing the electromagnetic braking (EMBr) continuous casting process. To investigate the metallurgical effect of Ruler-EMBr device, the effects of various electromagnetic parameters on the behaviors of molten steel flow, heat transfer, solidification, and inclusions motion in the FTSR mold were discussed. The results indicate that the application of Ruler-EMBr can improve the uniformity of molten steel temperature distribution and reduce the penetration depth of downward backflow in the FTSR mold. This is beneficial to the floating removal of inclusions entrained in the downward backflow. Moreover, it is also conducive to the upward backflow to transport more heat to the meniscus region, avoiding slag solidification and slag rim formation. The parametric study also shows that the molten steel surface velocity can be reduced and the surface fluctuation at the upper ports of submerged entry nozzle (SEN) can be controlled with the increase of magnetic flux density appropriately. When the magnetic flux density reaches to 0.3 T, the maximum molten steel surface velocity decreases to 0.27 m/s, and the surface peak value at the upper ports of SEN decreases to 7.3 mm.
- continuous casting /
- FTSR mold /
- electromagnetic braking /
- molten steel flow /
- heat transfer and solidification /
- inclusions motion

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图 1 结晶器内夹杂物迁移过程示意

Figure 1. Schematic diagram of inclusion transport process in the mold

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图 2 FTSR结晶器漏斗区内坯壳表面速度分布示意

Figure 2. Schematic distribution of shell surface velocity on the funnel region of FTSR mold

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图 3 全幅一段电磁制动装置结构示意

Figure 3. Schematic diagram of Ruler-EMBr

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图 4 FTSR结晶器计算区域及网格划分示意

Figure 4. Computational domain and mesh of the FTSR mold

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图 5 浸入式水口结构示意

Figure 5. Schematic diagram of submerged entry nozzle

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图 6 数值计算与物理试验获得的凝固坯壳厚度分布比较

Figure 6. Comparison between the predicted shell thickness and experimental measurements

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图 7 FTSR结晶器内磁感应强度、电流密度和电磁力分布

Figure 7. Distribution of magnetic flux density, induced current density and electromagnetic force in the FTSR mold

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图 8 不同磁感应强度下FTSR结晶器内钢液流动与温度分布

Figure 8. Velocity and temperature distribution of molten steel in the FTSR mold with various magnetic flux densities

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图 9 不同磁感应强度下FTSR结晶器内表面流速分布

Figure 9. Profile of surface velocity in the FTSR mold with various magnetic flux densities

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图 10 不同磁感应强度下FTSR结晶器内液面波动分布

Figure 10. Profiles of level fluctuation in the FTSR mold with various magnetic flux densities

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图 11 不同磁感应强度下FTSR结晶器内坯壳厚度分布

Figure 11. Thickness distribution of solidified shell in the FTSR mold with various magnetic flux densities

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图 12 不同磁感应强度下FTSR结晶器自由液面上夹杂物分布

Figure 12. Inclusions distribution on the free surface in the FTSR mold with various magnetic flux densities

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表 1 FTSR结晶器计算参数

Table 1. Computational parameters of FTSR mold

结晶器尺寸/ mm × mm	结晶器长度/mm	结晶器计算域/mm	漏斗最大开度/mm	漏斗区长度/mm	水口浸入深度/mm	拉坯速度/(m∙min^‒1)
1500 × 70	1200	4000	165	1200	225	4.5

钢液密度/(kg∙m^‒3)	钢液黏度/(Pa∙s)	钢液电导率/(S∙m^‒1)	磁感应强度/T	固相线温度/K	液相线温度/K	过热度/K
7020	0.0062	7.14 × 10⁵	0.15、0.2、0.3、0.5	1763	1 803	25

导热系数/(W∙m^‒1∙K^‒1)	比热容/(J∙kg^‒1∙K^‒1)	凝固潜热/(kJ∙kg^‒1)	热扩散系数/K^‒1	夹杂物比热容/(J∙kg^‒1∙K^‒1)	夹杂物密度/(kg∙m^‒3)	夹杂物粒径/μm
27^[3]	700^[3]	272^[3]	0.0001^[25]	860	5000^[24]	50

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表 2 FTSR结晶器不同网格节点数的误差统计结果

Table 2. Statistic results of error with different grid node numbers in the FTSR mold

网格	网格节点数	$ {{{T}}_{{{{M}}_{{i}}}}} $/mm	$ {\delta _{{T}}} = {{\left\| {{{{T}}_{{{{M}}_{{i}}}}} - {{{T}}_{{{{M}}_1}}}} \right\|} \mathord{\left/ {\vphantom {{\left\| {{{\text{T}}_{{{\text{M}}_{\text{i}}}}} - {{\text{T}}_{{{\text{M}}_1}}}} \right\|} {{{\text{T}}_{{{\text{M}}_1}}}}}} \right. } {{{{T}}_{{{{M}}_1}}}}} $
M₁	540,000	12.64	0
M₂	860,000	12.56	0.63%
M₃	1300,000	12.51	1.03%

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