Experimental study of acoustic agglomeration and fragmentation on coal-fired ash

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Shen, Guoqing^1 ; Huang, Xiaoyu^1 ; He, Chunlong^1 ; Zhang, Shiping^1 ; An, Liansuo^1 ; Wang, Liang^2 ; Chen, Yanqiao^2 ; Li, Yongsheng^2

North China Electric Power University, Beijing

102206, China^1

Guodian Science and Technology Research Institute, Beijing

100081, China^2

关键词: Acoustic agglomeration;    Bimodal particles;    Inhalable particles;    Optimal frequency;    Particle diameters;    Pretreatment technique;    Removal efficiencies;    Unimodal particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/5/052021/pdf
DOI  :  10.1088/1755-1315/121/5/052021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

As the major part of air pollution, inhalable particles, especially fine particles are doing great harm to human body due to smaller particle size and absorption of hazardous components. However, the removal efficiency of current particles filtering devices is low. Acoustic agglomeration is considered as a very effective pretreatment technique for removing particles. Fine particles collide, agglomerate and grow up in the sound field and the fine particles can be removed by conventional particles devices easily. In this paper, the agglomeration and fragmentation of 3 different kinds of particles with different size distributions are studied experimentally in the sound field. It is found that there exists an optimal frequency at 1200 Hz for different particles. The agglomeration efficiency of inhalable particles increases with SPL increasing for the unimodal particles with particle diameter less than 10 μm. For the bimodal particles, the optimal SPLs are 115 and 120 dB with the agglomeration efficiencies of 25% and 55%. A considerable effectiveness of agglomeration could only be obtained in a narrow SPL range and it decreases significantly over the range for the particles fragmentation.