基于积分近似矩量法的声波团聚数值模拟  

Numerical simulation of acoustic agglomeration by quadrature method of moments

作　　者：张光学[1] 刘建忠[2] 王洁[2] 周俊虎[2] 岑可法[2] 

机构地区：[1]中国计量学院能源工程研究所,浙江杭州310018 [2]浙江大学热能工程研究所,浙江杭州310027

出　　处：《化工学报》2011年第4期922-927,共6页CIESC Journal

基　　金：国家自然科学基金项目(50576083);浙江省自然科学基金项目(Y1100299);新世纪优秀人才支持计划项目(NCET-04-0533)~~

摘　　要：引言 目前我国在控制粉尘排放方面取得了较好的成效,燃煤锅炉等工业排放的烟气粉尘总浓度一般均能够满足国家排放标准。但是,现广泛采用的静电除尘设备、旋风分离器等均难以除去烟气中的超细颗粒。这些颗粒粒径很小（大多小于2.5μm,Acoustic agglomeration is a potential aerosol pre-conditioning technology which can greatly reduce particulate emission.Experimental research on this technology is extensive.However,most of the existing numerical simulations are slow and not precise enough.A numerical model of acoustic agglomeration was developed based on orthokinetic and hydrodynamic mechanisms,and was solved by using the newly developed quadrature method of moments（QMOM）.The results showed that this method was much faster and more precise than the discrete method.Then,the numerical simulation of acoustic agglomeration was validated by using experimental data.The effectiveness of acoustic agglomeration was sensitively dependent on acoustic frequency.The optimal frequency for coal-fired fly ash was about 1500 Hz.In addition,the results showed that the effectiveness of acoustic agglomeration increased rapidly as the standard deviation of particle size distribution increased.However,agglomeration was slightly enhanced with the increase in temperature.

关 键 词：声波团聚 积分近似矩量法 气溶胶 矩量 

分 类 号：X513[环境科学与工程—环境工程]