铁水脱硫偏心搅拌的模拟研究

郁青春; 刘志平; 阴树标; 张送来

doi:10.7513/j.issn.1004-7638.2022.05.019

铁水脱硫偏心搅拌的模拟研究

doi: 10.7513/j.issn.1004-7638.2022.05.019

郁青春^{1, 2,},
刘志平^3, ,,
阴树标²,
张送来^{1, 2}

1.
昆明理工大学真空冶金国家工程研究中心, 云南昆明650093
2.
昆明理工大学冶金与能源工程学院, 云南昆明650093
3.
鄂尔多斯应用技术学院, 内蒙古鄂尔多斯 017000

基金项目: 国家自然科学基金(51864025)资助项目

详细信息

作者简介:
郁青春，1971年出生，男，博士，教授，主要从事冶金二次资源综合利用方面的研究，E-mail：yqcy@163.com

通讯作者:
刘志平，1969年出生，男，博士，正高级工程师，主要从事亚稳态材料制备方面的研究，E-mail：relzp@163.com

中图分类号: TF535.2
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出版历程
- 收稿日期: 2022-05-04
- 刊出日期: 2022-11-01

Simulation study on the eccentric stirring of hot metal desulfurization

Yu Qingchun^{1, 2
,},
Liu Zhiping^{3
, ,},
Yin Shubiao²,
Zhang Songlai^{1, 2}

1.
National Engineering Center for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
3.
Ordos Institute of Technology, Ordos 017000, Inner Mongolia, China

摘要

摘要: 以铁水罐实际尺寸为基础，按一定比例建立物理模型，对KR法脱硫偏心搅拌进行物理模拟。利用CFD软件，结合VOF多相流模型、标准k-ɛ湍流模型和多重参考系法(MRF)对偏心搅拌铁水脱硫过程进行数值模拟。研究发现，偏心搅拌时漩涡形状呈倒锥形，漩涡深度极大值位于搅拌槽中心位置。搅拌轴距侧壁较近处流体运动强烈，且沿上下两个方向运动；较远处流体运动缓慢，搅拌桨末端流体平均速度约为较远处的2倍。偏心搅拌能改变搅拌器底部流体运动状态，减少“死区”。当搅拌转速由120 r/min增加到200 r/min时，流体平均速度约增加68%，高速流体体积占比略有降低，从60.4%降至57.9%。偏心搅拌易于在工业上实现，转速增加有利于脱硫剂的扩散，但最佳转速应考虑经济性与安全性。
- 铁水 /
- 炉外脱硫 /
- 偏心搅拌 /
- 数值模拟 /
- 流场
Abstract: Based on the actual size of molten iron tank, a physical model was proportionally established to simulate the eccentric stirring desulfurization using KR method. Numerical simulation was made to simulate the desulfurization process of hot metal with eccentric stirring by VOF multiphase flow model, standard k-ɛ turbulence model and Multiple Reference Frame method (MRF) using CFD software. It is found that the vortex shape is irregular during the eccentric stirring process, and the maximum vortex depth is located in the center of the mixer. Fluid moves strongly near the agitator wall, and flows along the upper and lower directions. Fluid in the far side moves slowly, and the average fluid velocity in the end side of blade is about twice that in the far side. Eccentric stirring can change the motion state of fluid at the bottom of the mixer and reduce the "dead zone". When the stirring speed increases from 120 r/min to 200 r/min, the average fluid speed increases by about 68%, and the volume proportion of high-speed fluid decreases slightly, from 60.4% to 57.9%. Eccentric stirring is easy to be realized in industry, and the increase of speed is beneficial to the diffusion of desulfurizer, however, the economy and safety should be considered for optimum speed.
- molten iron /
- desulfurization /
- eccentric stirring /
- simulation /
- flow field

HTML全文

图 1 水模型试验装置

Figure 1. Schematic diagram of water model experiment

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图 2 搅拌槽网格

Figure 2. Grid map of stirring tank

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图 3 不同转速下数值模拟与水模型试验对比

Figure 3. Comparison of numerical simulation and water model test with different stirring speeds

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图 4 水平截面流场分布

Figure 4. Flow field distribution diagram of horizontal section

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图 5 浸入深度217.5 mm时不同搅拌转速下流场分布

Figure 5. Flow field distribution at different mixing speeds with immersion depth of 217.5 mm

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图 6 中心搅拌与偏心搅拌流场

Figure 6. Flow fields of central stirring and eccentral stirring

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图 7 Z= −0.1 m处速度分布

Figure 7. Velocity distribution when Z=−0.1 m

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图 8 Y= −0.1 m处速度分布

Figure 8. Velocity distribution when Y=−0.1 m

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图 9 Y= 0.075 m处速度分布

Figure 9. Velocity distribution when Y=0.075 m

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图 10 速度累积曲线

Figure 10. Velocity accumulation curves

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