声波团聚脱除柴油机尾气中超细颗粒物的试验研究  

Experimental Study on Acoustic Agglomeration of Ultrafine Particles in Diesel Engine Exhaust

作　　者：陈厚涛[1] 章汝心[1] 曹金祥[1] 沈湘林[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《内燃机学报》2009年第2期160-165,共6页Transactions of Csice

基　　金：国家重点基础研究发展规划基金项目(2002CB211604)

摘　　要：利用低频率高强度声场试验装置，进行了脱除柴油机尾气中超细颗粒物的试验研究。由电称低压冲击器ELPI实时在线测量烟气中颗粒浓度在声波作用前后的变化，系统研究了声场强度、停留时间和颗粒数目浓度对细颗粒脱除效率的影响。结果表明，低频高强声场对柴油机尾气中的超细颗粒具有较高的团聚清除效果，提高声场强度、适当延长停留时间和增大初始颗粒数目浓度均有利于颗粒物的声波团聚脱除。当声波频率为1kHz、团聚室内声场强度达到161．5dB时，0．023—10μm粒径的颗粒数目浓度可减少55．7％。试验结果表明低频高强声波场是一种控制柴油机尾气中超细颗粒排放的有效方法。Experiments on removal of ultrafine higher-intensity acoustic field were carried out. particles in diesel engine exhaust with lower-frequency and During the experiments, the particle size distribution and concentration was measured online by the electrical low pressure impactor （ELPI）. The influence of acoustic intensity, residence time and particle number concentration on the particle removal efficiency was studied. The results show that under the influence of lower-frequency and higher-intensity acoustic waves, the submicron particles in diesel exhausts are removed efficiently. Increasing acoustic pressure, residence time and increasing initial particle number concentration are favorable to fine particles extending agglomeration and clean-up. When sound pressure level in the acoustic agglomeration chamber reaches 161.5 dB with frequency of 1 kHz, the number concentration of particles ranging between 0. 023 μm to 10 μm decreases by 55.7%. The study shows that low-frequency and high-intensity acoustic field is an effective way to decrease uhrafine particle emission in diesel engine.

关 键 词：声波团聚 超细颗粒 柴油机尾气 低频高强声场 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]