细颗粒在滤料中沉积和穿透特性的机理研究  

Study on Deposition and Penetration Properties of Fine Particles in Filters

作　　者：陶然[1] 李水清[1] 杨萌萌[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2015年第8期1721-1724,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划资助项目(N.o2013CB228506);国家高技术研究发展计划项目(No.2013AA065004)

摘　　要：现有的电厂除尘技术难以满足新排放标准严格的要求。电袋复合除尘技术因对细颗粒有相对较高的脱除效率而受到关注。本文利用滤料过滤实验台对不同工况下颗粒沉积过程进行了实验研究。实验测量滤料过滤的压降曲线,用ELPI测量出口颗粒穿透率,对过滤所得的滤料进行固化处理并用扫描电镜(SEM)观察。实验表明,颗粒从深层过滤向颗粒层过滤转变的主要信号是滤料表层纤维的颗粒沉积;且相对于表层沉积,颗粒进入滤料内部沉积量较少。Nowadays the conventional particulate（PM） control devices cannot meet the strict pollutant emission standard.The novel electrostatic-enhanced fabric technology,having high removal efficiency of submicron particle,has received more attention.In this paper,different filtration processes are researched with an experimental system of a filter for fine particulate capture.The pressure drops are recorded,and the penetration rates at the outlet are measured by an ELPI.The filters after filtration are processed with embedding method and observed under SEM.The results indicate that the transition signal from depth filtration to cake filtration is the particle deposition on filter surface.The deposited particles inside the filter are fewer compared to filter surface.

关 键 词：细颗粒 滤料过滤 荷电 固化 沉积结构 

分 类 号：O359[理学—流体力学]