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过程工程学报 ›› 2021, Vol. 21 ›› Issue (5): 541-549.DOI: 10.12034/j.issn.1009-606X.220152

• 流动与传递 • 上一篇    下一篇

不同排列结构的纤维层对捕集PM2.5性能影响的数值模拟

楚明浩, 刁永发*, 张俪安, 庄加玮   

  1. 东华大学环境与工程学院,上海 201620
  • 收稿日期:2020-05-15 修回日期:2020-06-24 出版日期:2021-05-22 发布日期:2021-06-01
  • 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重点资助项目

Numerical simulation of influence of fiber layers with different arrangement structures on performance of PM2.5 capture

Minghao CHU, Yongfa DIAO*, Li'an ZHANG, Jiawei ZHUANG   

  1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
  • Received:2020-05-15 Revised:2020-06-24 Online:2021-05-22 Published:2021-06-01
  • Contact: Diao yongfa diaoyongfa@dhu.edu.cn

摘要: 基于离散颗粒模型(Discrete Phase Model, DPM)研究了三种纤维排列结构捕集颗粒物规律。模拟了不同排列结构的纤维层在拦截和惯性碰撞两种捕集机制下捕集颗粒物的性能,考察了颗粒物粒径、入口风速和纤维层填充率对平行排列、单层垂直排列和双层垂直排列纤维层捕集颗粒物性能的影响。结果表明,当颗粒物粒径为0.5~2.5 μm,风速为0.6 m/s时,垂直纤维层捕集颗粒物对粒径为1.5 μm及以上颗粒物的捕集性能增强,捕集性能在粒径为2.0 μm时达到最大;入口风速为0.2~0.8 m/s,颗粒物粒径为2.5 μm时,单层垂直纤维层结构颗粒物捕集效率随风速增加而增加,并高于平行排列结构和双层垂直排列结构,且其捕集性能随风速增加而降低;纤维层的填充率为6.0%~22.4%,颗粒物粒径为2.5 μm时,纤维层对颗粒物的捕集效率随填充率增加而增加,捕集颗粒物性能随填充率增加而降低,单层垂直纤维层结构捕集效率始终高于另外两种结构;单层垂直纤维层结构对颗粒物的捕集速率最大。

关键词: 多纤维结构, 数值模拟, 捕集效率, 质量因子

Abstract: Based on the discrete phase model, the trapping performance of fiber layers with different arrangement structures under two trapping mechanisms of interception and inertial impaction was simulated by numerical simulation method. The effects of particle diameter, inlet velocity and fiber layer filling rate on the trapping performance of fiber layers with different arrangement structures were analyzed. The results showed that large particle size particles with inertial impaction as the main trapping mechanism were more easily affected by the arrangement structure of fiber layers. The vertical arrangement structure effectively improved the trapping performance of large particle size particles by fiber layers, and the trapping performance showed a trend of increasing first and then decreased with the increase of particle diameter. The trapping efficiency of fiber layers with different arrangement structures for large particle size increased with the increase of inlet velocity. The trapping efficiency of fiber layers with single-layer vertical arrangement structure was higher than that of the other two arrangement structures, and its trapping performance decreased with the increase of inlet velocity. The trapping efficiency of fiber layers with different arrangement structures increased with the increase of filling rate, while the trapping performance decreased with the increase of filling rate. Compared with the fiber layers with the three arrangement structures, under the conditions of low filling rate and low inlet velocity, the single-layer vertical arrangement structure fiber layer had the most obvious improvement in the trapping performance of large particle size particles. The single-layer vertical arrangement structure fiber layer had the highest trapping rate for particulate matter.

Key words: multifiber structure, numerical simulation, capture efficiency, quality factor