Taking the pilot test platform of a coal-fired power plant with flue gas flow of 20 000 m~3/h at standard temperature and pressure as research object

the sound wave generators were installed at both sides of the flue duct

and combining with spray humidification

the authors tested the effects of frequencies and sound pressure level on acoustic agglomeration of fine particles in fly ash. The results show that

the acoustic frequency and sound pressure level have a great influence on the agglomeration. When the acoustic wave frequency was 1 400～1 700 Hz

a better agglomeration effect of PM_(2.5) in the flue gas could be obtained. As the sound pressure level(or power) increased

the agglomeration efficiency increased. Especially

this increase became significant when the intensity of sound was higher than 140 dB. The acoustic wave combined with spray humidification could further promote the agglomeration effect of fine particles in flue gas and enhance the removal effect of electrostatic precipitator on PM_(2.5) and PM1. The research results have important guiding significance for improving the agglomeration of fly ash fine particles and increasing dust removal efficiency.