Effect of seed particles on acoustic agglomeration efficiency
Effect of seed particles on acoustic agglomeration efficiency
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发表时间：
2011
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通讯作者：
Cen Ke-fa
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作者：
Cen Ke-fa
细颗粒团聚技术是控制空气颗粒物污染的有效方法，而声学团聚技术被认为是最有前途的技术之一。本研究将大颗粒石灰种子引入低频(1000-2000 Hz)的声学团聚实验中。通过在线测量细颗粒的分布，研究了石灰种子颗粒对声学团聚的影响。结果表明，石灰种子颗粒的声学团聚可以获得更高的团聚效率，最好的效率为70.5%。对于声学团聚效率较低的情况，引入石灰种子颗粒可以显著提高团聚效率。团聚效率与声频、声压级、停留时间、颗粒的数量和大小有关，石灰颗粒的引入可以扩大“频率窗口”，即使在较低的声压级下也能获得较好的团聚效果，降低了对团聚设备尺寸的依赖，从而改善了声学团聚的性能，降低了能耗。结果表明，种子颗粒的投加量应适中，过多的种子颗粒会降低团聚效率，颗粒尺寸应适中，否则团聚效率的提高有限。
Fine particle agglomeration technique is an effective method to control the air particle pollution,and acoustic agglomeration is considered as one of the most promising techniques.In this study,large size lime seed particles were introduced to the acoustic agglomeration experiment at low frequency(1000—2000 Hz).The distribution of fine particles was measured online by electrical low pressure impactor(ELPI)to investigate the effect of lime seed particles on acoustic agglomeration.The results show that the acoustic agglomeration with lime seed particles can attain higher agglomeration efficiency,with the best efficiency of 70.5%.For the cases with low acoustic agglomeration efficiency,the introduction of lime seed particles improves the agglomeration efficiency significantly,and the highest increment in agglomeration efficiency reaches 15.5%.The agglomeration efficiency depends on the sound frequency,sound pressure level,residence time,amount and size of seed particles.The introduction of lime seed particles can expand the "frequency window" and give a better agglomeration effect even at lower sound pressure level,and decrease the dependence on the size of agglomeration equipment,which improves the performance of acoustic agglomeration and reduces the energy consumption.The results show that the amount of seed particles should be appropriate and excessive seed particles will reduce the agglomeration efficiency.The size of seed particles should be moderate,otherwise the improvement of agglomeration efficiency is limited.