RH精炼过程气体喷吹角度对多相流动及传质的影响

王家昊; 倪培远; 陈超; Mikael Ersson; 厉英

doi:10.1007/s12613-022-2558-5

Volume 30 Issue 5

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(5): 844-856

Jiahao Wang, Peiyuan Ni, Chao Chen, Mikael Ersson, and Ying Li, Effect of gas blowing nozzle angle on multiphase flow and mass transfer during RH refining process, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 844-856. https://doi.org/10.1007/s12613-022-2558-5

Cite this article as:

Jiahao Wang, Peiyuan Ni, Chao Chen, Mikael Ersson, and Ying Li, Effect of gas blowing nozzle angle on multiphase flow and mass transfer during RH refining process, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 844-856. https://doi.org/10.1007/s12613-022-2558-5

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研究论文

RH精炼过程气体喷吹角度对多相流动及传质的影响

1)
东北大学冶金学院，多金属共生矿生态化冶金教育部重点实验室，沈阳 110819，中国
2)
东北大学冶金学院，冶金传感器材料及技术辽宁省重点实验室，沈阳 110819，中国
3)
太原理工大学材料科学与工程学院，太原 030024，中国
4)
Department of Materials Science and Engineering, KTH Royal Institute of Technology, Stockholm, SE-10044, Sweden

通讯作者:
倪培远 E-mail: nipeiyuan@smm.neu.edu.cn

厉英 E-mail: liying@mail.neu.edu.cn

文章亮点

(1) 提出并研究了旋转流驱动RH高效精炼新技术

(2) 系统揭示了旋转喷吹对提升循环流量和缩短混匀时间的作用机理

(3) 全面掌握了喷吹角度对RH高效精炼过程多相流场的影响规律

中文摘要

当前，在我国制造业高质量发展和“双碳”战略下，钢铁工业的高端、绿色、低碳、高效率的创新发展十分关键。RH精炼具有脱碳、脱气、脱硫、去除夹杂物及调整钢水成分等冶金功能，已成为轴承钢等诸多高品质钢生产的重要工序之一。本研究工作基于提高RH上升管气泡分散度、扩大气泡与钢水相互作用范围的思路，创新性的提出了旋转喷吹新技术，通过简单改变上升管气体喷吹角度，实现上升管内钢水的旋转流动，而钢水旋转流动进一步促进气泡的弥散分布，从而充分发挥气泡对钢水的提升作用，提高上升管横截面速度分布的均匀性和RH精炼的循环流量。本文首先开展了传统喷吹条件下的数值模拟和水模型实验研究，结果表明，气体流量为40 L·min^-1时，数值模型预测的混匀时间与水模型实验测得的结果吻合较好，在选定的三个监测点位置，模型预测值与水模型实测值的误差在1.3%~7.3%范围内，证明了数值模型的可靠性；其次，开展了不同气体喷吹角度对RH精炼过程多相流动及传质行为的影响，研究表明，传统喷吹角度下的循环流量为9 kg·s^-1，当喷嘴水平旋转30°或45°时，循环流量提高了约15%，此外，预测的三个监测点的混匀时间分别缩短了约21.3%、28.2%和12.3%。喷吹角度为30°和45°时，对128个气泡的统计分析表明，气泡在流体中的平均停留时间增加了约33.3%。研究表明，新的喷吹技术有利于提升RH循环流量和混匀时间，有望为进一步提升RH精炼效率提供了重要解决思路。

关键词:

Research Article

Effect of gas blowing nozzle angle on multiphase flow and mass transfer during RH refining process

+ Author Affiliations

1)
Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry, School of Metallurgy, Northeastern University, Shenyang 110819, China
2)
Liaoning Key Laboratory of Metallurgical Sensor Materials and Technology, School of Metallurgy, Northeastern University, Shenyang 110819, China
3)
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
4)
Department of Materials Science and Engineering, KTH Royal Institute of Technology, Stockholm SE-10044, Sweden

Corresponding authors:
Peiyuan Ni E-mail: nipeiyuan@smm.neu.edu.cn

Ying Li E-mail: liying@mail.neu.edu.cn
Received: 19 August 2022; Revised: 16 September 2022; Accepted: 29 September 2022; Available online: 30 September 2022

Abstract

Abstract

A three-dimensional mathematical model was developed to investigate the effect of gas blowing nozzle angles on multiphase flow, circulation flow rate, and mixing time during Ruhrstahl-Heraeus (RH) refining process. Also, a water model with a geometric scale of 1:4 from an industrial RH furnace of 260 t was built up, and measurements were carried out to validate the mathematical model. The results show that, with a conventional gas blowing nozzle and the total gas flow rate of 40 L·min^–1, the mixing time predicted by the mathematical model agrees well with the measured values. The deviations between the model predictions and the measured values are in the range of about 1.3%–7.3% at the selected three monitoring locations, where the mixing time was defined as the required time when the dimensionless concentration is within 3% deviation from the bath averaged value. In addition, the circulation flow rate was 9 kg·s^–1. When the gas blowing nozzle was horizontally rotated by either 30° or 45°, the circulation flow rate was found to be increased by about 15% compared to a conventional nozzle, due to the rotational flow formed in the up-snorkel. Furthermore, the mixing time at the monitoring point 1, 2, and 3 was shortened by around 21.3%, 28.2%, and 12.3%, respectively. With the nozzle angle of 30° and 45°, the averaged residence time of 128 bubbles in liquid was increased by around 33.3%.
- Ruhrstahl-Heraeus refining;
- gas blowing nozzle angle;
- circulation flow rate;
- mixing time;
- multiphase flow

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