Improve acoustic agglomeration of fine particles by droplet spray

ZHANG Guangxue; ZHU Yingjie; ZHOU Taotao; WANG Jinqing; XU Hong; CHI Zuohe

doi:10.11949/j.issn.0438-1157.20161586

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Improve acoustic agglomeration of fine particles by droplet spray

更新时间：2025-12-10

- Improve acoustic agglomeration of fine particles by droplet spray
- CIESC Journal Issue 3, Pages: 864-869(2017)
- 作者机构：
  
  中国计量大学能源工程研究所,浙江,杭州,310018
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161586
  CLC： 513
- Online First：05 March 2017，
  
  Published：05 March 2017
- 稿件说明：
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ZHANG Guangxue, ZHU Yingjie, ZHOU Taotao, et al. Improve acoustic agglomeration of fine particles by droplet spray[J]. CIESC Journal, 2017, (3): 864-869.
DOI：

ZHANG Guangxue, ZHU Yingjie, ZHOU Taotao, et al. Improve acoustic agglomeration of fine particles by droplet spray[J]. CIESC Journal, 2017, (3): 864-869. DOI： 10.11949/j.issn.0438-1157.20161586.

摘要

以燃煤烟气为对象，实验研究了各参数对喷雾促进声波团聚的影响。结果表明，添加喷雾后，声波团聚效率提高了25%~40%。无论有无喷雾，声波团聚均存在相同的最佳频率，为1400 Hz左右。较低液气比时，团聚效率随液气比的增加而明显增大，但超过0.10后，团聚效率趋于稳定。添加喷雾时，团聚效率随停留时间的增加而提高，但达到4.2 s时基本达到最大值。分析了喷雾提高团聚效率的机理，在喷雾作用下，颗粒之间形成比范德华力更强的液桥力，增大了有效碰撞系数；同时，雾化液滴的加入为气溶胶团聚提供了种子颗粒，周围的细颗粒易与之发生碰撞团聚，使团聚效率提高。研究表明，喷雾方法可以大幅降低声波团聚工艺的操作能耗。

Abstract

Acoustic agglomeration is a potential pretreatment technology for efficient reduction of particulate matter emission in flue gas. However

high energy consumption restricts its commercial application. To improve acoustic agglomeration efficiency

droplet spray was added to aerosol. The influences of operating parameters on agglomeration efficiency were studied to explore compounding effect of acoustic field and droplet spray. The results showed that acoustic agglomeration efficiency was increased by 25% to 40% with addition of droplet spray. Whether the droplet spray existed or not

similar influence of sound frequency on agglomeration was observed with optimum frequency at 1400 Hz. The agglomeration efficiency rose with the increase of sound power

liquid-gas ratio or aerosol residence time

which reached to maximum when liquid-gas ratio was over 0.10 or aerosol residence time exceeded 4.2 s. Two main mechanisms were proposed for the improvement of agglomeration efficiency with presence of droplet spray. One was that droplet spray created liquid bridge forces between particles

which were much stronger than van der Waals forces

and increased collision efficiency greatly. The other was that liquid droplets acted as particle seeds for agglomeration

which had significantly different entrainment factors compared to surrounding small particles. Consequently

relative movement among aerosol particles was enhanced so agglomeration efficiency was promoted. The results suggest that energy consumption of acoustic agglomeration process can be reduced dramatically with addition of droplet spray.

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