渣-金界面气泡夹带行为数值物理模拟

doi:10.11900/0412.1961.2022.00218

金属学报

2023, Vol. 59

Issue (11): 1523-1532 DOI: 10.11900/0412.1961.2022.00218

本期目录 | 过刊浏览

渣-金界面气泡夹带行为数值物理模拟

周小宾¹(

), 赵占山², 汪万行¹, 徐建国¹, 岳强¹

^1.安徽工业大学冶金工程学院马鞍山 243032
^2.日照钢铁控股集团有限公司 ESP制造部日照 276806

Physical and Mathematical Simulation on the Bubble Entrainment Behavior at Slag-Metal Interface

ZHOU Xiaobin¹(

), ZHAO Zhanshan², WANG Wanxing¹, XU Jianguo¹, YUE Qiang¹

^1.School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, China
^2.ESP Department, Rizhao Steel Holding Group Co., Ltd., Rizhao 276806, China

引用本文:

周小宾, 赵占山, 汪万行, 徐建国, 岳强. 渣-金界面气泡夹带行为数值物理模拟[J]. 金属学报, 2023, 59(11): 1523-1532.
Xiaobin ZHOU, Zhanshan ZHAO, Wanxing WANG, Jianguo XU, Qiang YUE. Physical and Mathematical Simulation on the Bubble Entrainment Behavior at Slag-Metal Interface[J]. Acta Metall Sin, 2023, 59(11): 1523-1532.

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摘要:

利用物理模拟和数值模拟研究气泡和熔渣不同物性参数对气泡在渣-金界面夹带量的影响。研究结果表明，影响气泡夹带量和渣-金界面面积的主要因素是气泡直径，其次是渣层密度，渣黏度和界面张力对气泡夹带影响相对较小。气泡初始直径由10 mm增大到16 mm，气泡夹带量增大了7.41倍，渣-金界面面积增量最大值增大3.67倍。渣层密度由2000 kg/m³增大到5000 kg/m³，气泡夹带量增大了62.3%，渣-金界面面积最大值增大了13.1%。渣-金界面张力和黏度增大，气泡夹带量和渣-金界面面积均降低。渣-金界面张力从0.65 N/m增大到1.10 N/m，气泡夹带量减小了30.6%，渣-金界面面积最大值减小6.4%。渣层黏度由0.05 Pa·s增大到2.0 Pa·s时，气泡夹带量降低18.4%，渣-金界面面积最大值减小10.2%。

关键词 ：渣-金界面, 气泡夹带, 界面张力, 数值模拟, 物理模拟

Abstract：

The flow and interaction between slag, metals, and bubbles are very complicated phenomena in metallurgical processes, such as desulfurization in hot metal pretreatment, steelmaking process in a converter, and second refining process. The molten steel or hot metal can be entrained into the slag when a bubble or bubbles flow through the slag-metal interface during the metallurgical process. The bubble entrainment behavior can increase the heat and mass transfer and, in turn, increase the chemical reaction efficiency of the slag-metal interface. Investigating the entrainment behavior helps in understanding the interaction between bubbles and liquid phases. The current study focuses on the effects of bubbles and slag properties on the bubble entrainment behaviors at the slag-metal interface. The results show that the bubble size is the most important factor influencing the entrainment, followed by the slag density. The slag viscosity and interfacial tension of the slag-metal interface show a weaker effect on the entrainment. In particular, the entrainment volume of steel and maximum area of the slag-metal interface increase by 7.41 and 3.67 times when the bubble diameter increased from 10 to 16 mm, respectively. When the slag density increases from 2000 to 5000 kg/m³, the entrainment volume of steel and maximum area of the slag-metal interface increase by 62.3% and 13.1%, respectively. The increasing in slag viscosity and interfacial tension is less affected by slag entrainment and interface area. The entrainment volume of steel and maximum area of the slag-metal interface are decreased by 30.6% and 6.4% when the interfacial tension of the slag-metal interface increases from 0.65 to 1.10 N/m, respectively. Similarly, when the slag viscosity increases from 0.05 to 2.0 Pa·s, the entrainment volume of steel and maximum area of the slag-metal decrease by 18.4% and 10.2%, respectively.

Key words： slag-metal interface bubble entrainment interfacial tension mathematical simulation physical simulation

收稿日期: 2022-05-05

ZTFLH:

TF7

基金资助:国家自然科学基金项目(51704006);国家自然科学基金项目(51774004)

通讯作者: 周小宾，zxbahut@ahut.edu.cn，主要从事冶金过程数值物理模拟研究

Corresponding author: ZHOU Xiaobin, Tel: 18955536370, E-mail: zxbahut@ahut.edu.cn

作者简介: 周小宾，男，1985年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00218 或 https://www.ams.org.cn/CN/Y2023/V59/I11/1523

图1 实验装置示意图

表1 物理实验流体物性参数

图2 计算域及边界条件示意图

图3 几何模型网格划分示意图

表2 数值模拟物性参数[27]

图4 不同油-水体系气泡夹带量变化

图5 气泡上升过程的数值模拟和物理模拟结果对比

图6 气泡夹带数值模拟结果和实验结果对比

图7 渣层中钢液体积随时间的变化

图8 不同因素对气泡夹带量的影响

图9 渣-金界面面积变化

图10 物性参数对渣-金界面面积的影响

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