燃煤可吸入颗粒物声波团聚效果的实验研究和数值分析  

Experimental Study and Numerical Analysis of the Acoustic Agglomeration Effectiveness of Inhalable Particles of Burned Coal

作　　者：姚刚[1] 赵兵[1] 沈湘林[1] 

机构地区：[1]东南大学洁净煤发电与燃烧技术教育部重点实验室,江苏南京210096

出　　处：《热能动力工程》2006年第2期175-178,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划基金资助项目(2002CB211600)

摘　　要：通过对平面驻波声场的理论分析,设计并建立了燃煤可吸入颗粒物声波团聚清除特性的实验台。研究了燃煤可吸入颗粒物在高强度声波场作用下,不同声波强度和声场停留时间对于声波团聚前后颗粒粒径分布变化的影响。在实验的基础上,进行了数值计算,将数值解和实验解进行了比较,两者吻合得较好,并通过数值算法对颗粒初始浓度和声波频率影响进行了预测。实验和数值结果表明:对于可吸入颗粒物,提高声波强度、延长声场停留时间、增加初始颗粒浓度均有利于颗粒的团聚。发现频率增加有利于小颗粒的团聚,但是对整体清除效果则存在一个最佳频率。Through a theoretical analysis of a plane standing-wave sonic field a test rig on acoustic agglomeration and removal characteristics of burned coal inhalable particles has been designed and set up.Under the condition of the inhalable particles of burned coal being subject to the action of a high intensity sonic field studied was the impact of different acoustic intensity and particle retention time in sonic field on the change of particle diameter distribution prior to and after the acoustic agglomeration.On the basis of experiments a numerical calculation was conducted.A comparison of the results of numerical calculation with those of experiments revealed a relatively good agreement.Moreover,by way of a numerical algorithm a forecast was performed of the influence of particle initial concentration and acoustic frequency.The results of experiments and numerical calculation indicate that as for the inhalable particles an increase in acoustic intensity,a lengthening of retention time in sonic fields and an enhancement in initial particle concentration is,without exception,favorable to particle agglomeration.It has been found that an increase in frequency can contribute to the agglomeration of small particles.However,there exists an optimum frequency for attaining integral removal effectiveness.

关 键 词：燃煤可吸入颗粒物 声波团聚 数值预测 

分 类 号：X513[环境科学与工程—环境工程]