欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2021, Vol. 21 ›› Issue (8): 926-934.DOI: 10.12034/j.issn.1009-606X.220241

• 流动与传递 • 上一篇    下一篇

磁性纤维直径对捕集Fe基细颗粒影响数值模拟

贾中坚， 刁永发*， 张俪安， 楚明浩， 沈恒根
  

  1. 东华大学环境科学与工程学院，上海 201620

  • 收稿日期:2020-07-24 修回日期:2020-09-15 出版日期:2021-08-28 发布日期:2021-08-24
  • 通讯作者: 刁永发 diaoyongfa@dhu.edu.cn
  • 基金资助:
    国家重点研发计划资助项目;中央高校基本科研业务费重点资助项目

Numerical simulation of the effect of magnetic fiber diameter on trapping Fe-based fine particles

Zhongjian JIA,  Yongfa DIAO*,  Li′an ZHANG,  Minghao CHU,  Henggen SHEN   

  1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

  • Received:2020-07-24 Revised:2020-09-15 Online:2021-08-28 Published:2021-08-24
  • Contact: Diao yongfa diaoyongfa@dhu.edu.cn

RichHTML

PDF

摘要： 为了实现对钢铁行业微细颗粒的超低排放，提出磁性纤维提高对 Fe基细颗粒物的捕集。 基于计算流体力学?离散相模型CFD-DPM对比研究了传统纤维、磁性纤维直径对Fe基细颗粒捕集效率以及过滤阻力的影响。结果表明：当风速为0.10 m/s时，对于直径为35~45 μm范围的纤维，直径的增大能够明显增加过滤阻力。对于粒径小于2.5 μm的颗粒，磁性纤维直径的增加对捕集效率提高的影响相对较小，当颗粒粒径大于2.5 μm时，增大纤维直径能够显著提高捕集效率。风速处于0.01~0.05 m/s范围时，增大纤维直径对提高磁性纤维捕集效率作用明显；当风速为0.08~0.10 m/s时，纤维直径变化对捕集效率的影响较小。磁性纤维质量因子随纤维直径增大而下降。

关键词: 纤维直径, Fe基细颗粒, 磁性纤维, 质量因子, PM2.5

Abstract: In order to achieve ultra-low emissions of fine particles in the steel industry, magnetic fibers are proposed to improve the trapping efficiency of Fe-based fine particles. Based on CFD-DPM (Discrete Phase Model), the effect of traditional fiber and magnetic fiber diameter on the trapping efficiency of Fe-based fine particles and the filtration resistance of the fiber was studied. The results showed that there was no obvious difference in filtration resistance between magnetic fiber and traditional fiber. When the wind speed was 0.10 m/s, for fibers with a diameter in the range of 35~45 μm, the increase in diameter can significantly increase the filtration resistance. Traditional fibers had a low trapping efficiency for particles with a particle size of less than 2.5 μm. As the particle size increase, the trapping efficiency gradually increased. When the wind speed was in the range of 0.01~0.10 m/s, as the wind speed increased, the traditional fiber trapping efficiency decreased first and then increased. For the trapping efficiency of particles with a particle size of 4.5 μm, the traditional fiber diameter had an optimal range of 15~25 μm. For particles with a particle size of less than 2.5 μm, the increase in the diameter of the magnetic fiber had a relatively small effect on the improvement of the trapping efficiency. When the particle size was greater than 2.5 μm, increasing the fiber diameter can significantly improve the trapping efficiency. When the wind speed was in the range of 0.01~0.05 m/s, increasing the fiber diameter had a significant effect on improving the magnetic fiber trapping efficiency; when the wind speed was 0.08~0.10 m/s, the effect of the change in fiber diameter on the trapping efficiency was smaller. The quality factor of magnetic fiber decreased with the increase of fiber diameter. When the fiber diameter was in the range of 10~35 μm, the decreasing rate of the quality factor of increasing fiber diameter was small, and when the fiber diameter was in the range of 35~45 μm, the decreasing rate of quality factor was larger.

Key words: fiber diameter, Fe-based particles, magnetic fiber, quality factor, PM2.5