不同粒径分布颗粒声波团聚联合喷雾实验研究
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摘要
针对不同粒径分布的飞灰颗粒进行了声波团聚联合喷雾实验研究.实验结果表明,喷雾不改变声波团聚最佳频率,在1 200 Hz时团聚效果最好.颗粒物团聚效果与粒径分布有关,粒径分布范围较小的颗粒团聚效率随声压级增大而增大,粒径分布范围较宽的颗粒存在最佳声压级,声压级过高易引发团聚体破碎,降低团聚效率.加入喷雾能够提高团聚效率,同时避免宽粒径范围颗粒在高声压级下的团聚破碎.
Acoustic agglomeration and sprayed droplet experiments were performed on ash particles with different particle size distributions. The spray does not change the optimal frequency of acoustic agglomeration,and the agglomerating effect is optimal at 1 200 Hz. The effect of particle agglomeration is related to the particle size distribution. With a smaller particle size distribution range,the particle agglomerating efficiency increases with increasing sound pressure level(SPL). The widest particle size range exhibited the best sound pressure level. A desirable agglomeration could only be obtained within a narrow SPL range,wherea the agglomeration efficiency significantly decreases over the range owing to the agglomerates fragmentation. The spraying of water droplets can improve the agglomeration efficiency and meanwhile avoid the fragmentation of agglomerates for bimodal particles with a wide particle size range.
Acoustic agglomeration and sprayed droplet experiments were performed on ash particles with different particle size distributions. The spray does not change the optimal frequency of acoustic agglomeration,and the agglomerating effect is optimal at 1 200 Hz. The effect of particle agglomeration is related to the particle size distribution. With a smaller particle size distribution range,the particle agglomerating efficiency increases with increasing sound pressure level(SPL). The widest particle size range exhibited the best sound pressure level. A desirable agglomeration could only be obtained within a narrow SPL range,wherea the agglomeration efficiency significantly decreases over the range owing to the agglomerates fragmentation. The spraying of water droplets can improve the agglomeration efficiency and meanwhile avoid the fragmentation of agglomerates for bimodal particles with a wide particle size range.
引文
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[6]Hoffmann T L,Scaroni A W,Song L,et al.Experimental and numerical analysis of bimodal acoustic agglomeration[J].Journal of Vibration and Acoustics,1993,115(3):232-240.
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[8]张光学,刘建忠,周俊虎,等.燃煤飞灰低频下声波团聚的实验研究[J].化工学报,2009,60(4):1001-1006.Zhang Guangxue,Liu Jianzhong,Zhou Junhu,et al.Acoustic agglomeration of coal-fired fly ash particles in low frequency sound fields[J].CIECS,2009,60(4):1001-1006(in Chinese).
[9]张光学,刘建忠,周俊虎,等.小颗粒声波团聚中碰撞效率的计算及影响分析[J].化工学报,2009,60(1):43-47.Zhang Guangxue,Liu Jianzhong,Zhou Junhu,et al.Simulation and analysis of collision efficiency in acoustic agglomeration[J].CIECS,2009,60(1):43-47(in Chinese).
[10]张光学,刘建忠,周俊虎,等.频率对燃煤飞灰声波团聚影响的模型及实验验证[J].中国电机工程学报,2009,29(17):97-102.Zhang Guangxue,Liu Jianzhong,Zhou Junhu,et al.Atheoretical model and experimental verification on the influence of frequency on acoustic agglomeration of coalfired fly ash[J].Proceedings of the CSEE,2009,29(17):97-102(in Chinese).
[11]王洁,张光学,刘建忠,等.种子颗粒对声波团聚效率的影响[J].化工学报,2011,62(2):354-361.Wang Jie,Zhang Guangxue,Liu Jianzhong,et al.Effect of seed particles on acoustic agglomeration efficiency[J].CIECS,2011,62(2):354-361(in Chinese).
[12]Yan Jinpei,Chen Liqi,Yang Linjun.Combined effect of acoustic agglomeration and vapor condensation on fine particles removal[J].Chemical Engineering Journal,2016,209(4):319-327.
[13]颜金培,陈立奇,杨林军,等.声波与相变联合作用下细颗粒物脱除的实验研究[J].中国电机工程学报,2014,34(20):3282-3288.Yan Jinpei,Chen Liqi,Yang Linjun,et al.Experimental study on removal of fine particles under the combined effect of acoustic and vapor condensation[J].Proceedings of the CSEE,2014,34(20):3282-3288(in Chinese).
[14]Yang L,Bao J,Yan J,et al.Removal of fine particles in wet flue gas desulfurization system by heterogeneous condensation[J].Chemical Engineering Journal,2010,156(1):25-32.
[15]Yan J,Chen L,Li Z.Removal of fine particles from coal combustion in the combined effect of acoustic agglomeration and seed droplets with wetting agent[J].Fuel,2016,165:316-323.
[16]Yan J,Bao J,Yang L,et al.The formation and removal characteristics of aerosols in ammonia-based wet flue gas desulfurization[J].Journal of Aerosol Science,2011,42(9):604-614.
[17]Fan F,Yang L,Yan J,et al.Numerical analysis of water vapor nucleation on PM 2.5 from municipal solid waste incineration[J].Chemical Engineering Journal,2009,146(2):259-265.