燃煤飞灰超细颗粒物声波团聚清除的实验研究

Experimental Study on Acoustic Agglomeration of Ultrafine Fly Ash Particles

对燃煤超细颗粒物在低频率高强度声场中团聚清除效果进行了实验研究。通过对声场的理论分析,设计并建立了燃煤飞灰超细颗粒物声波团聚清除实验平台。利用该实验平台,研究了声场强度对细颗粒清除效率的影响以及颗粒粒径分布的迁移特性。实验结果表明,低频高强声场对亚微米颗粒及亚微米以下颗粒有较好的团聚清除效果。而且随着声场强度的增大,超细颗粒的清除效率也增加。当团聚室内声强达到160dB时,PM2.5总颗粒数量浓度减少了58.9%,质量浓度减少了68.4%;PM10总颗粒数量浓度减少了59.0%,质量浓度减少了77.7%。

The removal of ultrafine particles in coal-fired fumes was studied experimentally based on lower frequency and higher intensity acoustic field. An experiment facility was designed and set up. The influence of sound feld intensity on removal efficiency was studied, as well as the shift features of particle size distribution. The results show that under the effect of lower frequency and higher intensity sound waves, there is good performance to remove submicron particles in coal-fired fumes. Moreover, the removal efficiency of ultrafine particles increases with sound intensity increasing. When the sound pressure level in the acoustic agglomeration chamber reaches 160dB, the reduction of PM2.5 number concentration and mass concentration can reach the values of 58.9% and 68.4%, respectively. For the PM10, the values are 59.0% and 77.7%, respectively.