The Influences of Acoustic and Pulsed Corona Discharge Coupling Field on Agglomeration of Monodisperse Fine Particles

Mingchun He,Haolin Wang,Zhongyang Luo,Mengxiang Fang

doi:10.3390/app10031045

Abstract

In view of the low efficiency of traditional electrostatic precipitators in removing fine particles, acoustic and pulsed corona discharge coupling fields were proposed to increase particle size. In this paper, monodisperse particles with three different sizes (0.5 μm, 2 μm, and 4 μm) were generated to investigate the agglomeration effect under different parameters in external fields. A larger reduction ratio of particle number concentration resulted in a higher agglomeration efficiency. Results indicated that, in the range from 800 to 2400 Hz, the acoustic agglomeration effect on 4-μm particles was better than that on 0.5-μm and 2-μm particles. In the pulsed corona discharge field, agglomeration efficiencies of the three particle sizes were lower than those in the acoustic field. However, application of the coupling field highly improved agglomeration efficiency compared with the single field. When a pulse input voltage of 50 kV with acoustic sound pressure level (SPL) of 143 dB and frequency of 1600 Hz was selected, the corresponding number reduction ratio of 0.5-μm, 2-μm, and 4-μm particles increased to 0.464, 0.526, and 0.918 from 0.254, 0.438, and 0.814 in the acoustic wave field and 0.226, 0.385, and 0.794 in the pulsed corona discharge field.

Highlights

With the rapid development of economy and society in China, the enormous amount of energy consumption caused severe air pollution problems [1,2,3,4,5]
It can be concluded that large sound pressure level (SPL) are conducive to acoustic agglomeration
Comparative experimental studies were performed to determine the effects of pulsed discharge and acoustic wave coupling fields on the monodisperse aerosol particle agglomeration and reduction ratio

Summary

Introduction

With the rapid development of economy and society in China, the enormous amount of energy consumption caused severe air pollution problems [1,2,3,4,5]. The flue gas emitted by coal-fired power plants contains a variety of fine particles, which are major air pollutants in some big cities. Fine particulate matter with a particle size less than 2.5 μm is denoted as PM2.5. Large quantities of toxic substances can be transported because of their small sizes and large specific surface areas. These can, enter the lungs and endanger human health [6,7,8,9]. Traditional dust removers, such as cyclone dust collectors and electrostatic precipitators (ESPs), with high efficiency in decreasing the mass concentration of particles, exhibit low efficiency in removing PM1 (85% or less) [10,11,12]

Methods

Results

Conclusion