双极荷电细颗粒物加速诱导凝并的机理研究

项目名称： 双极荷电细颗粒物加速诱导凝并的机理研究

项目编号： No.21306199

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 化学工业

项目作者： 徐俊波

作者单位： 中国科学院过程工程研究所

项目金额： 25万元

中文摘要： 随着我国城市化和工业化进程日益加快，PM2.5污染已成为突出的环境问题，已引起国家的高度重视。常规除尘设备如静电除尘器、布袋除尘器等，对于粒径小于2.5μm的颗粒不能有效捕集，采用双极荷电凝并技术使小颗粒凝并为大颗粒成为提高除尘效率、降低PM2.5排放的主要途径。本项目拟以电除尘器中双极荷电细颗粒物的凝并为研究对象，以增加内构件及交变电场作为加速颗粒凝并的技术手段，通过构建包含颗粒间库仑相互作用、荷电颗粒凝并的流体力学模型，对诱导凝并区内荷电颗粒的空间分布、运动状态及凝并情况进行模拟分析，结合实验测量结果，阐释湍流流场及交变电场对双极荷电颗粒凝并的影响规律，归纳分析双极荷电颗粒加速诱导凝并机理，建立综合一次积尘与荷电区、诱导凝并区及二次积尘区的预测模型，为双极荷电凝并电除尘器的优化设计提供理论指导和实验依据。

中文关键词： 超细颗粒物；静电除尘器；计算流体力学；双流体模型；双极荷电颗粒凝并

英文摘要： Along with our country's fast urbanization and industrialized process, PM2.5 pollution has became a prominent environmental problem, which aroused the attention of the government. Conventional dust collecting equipments, such as electrostatic precipitator, bag filter, etc., can't effectively capture the particles which size is less than 2.5μm. To increase the collection efficiency of aerosol particles and prevent air pollution, one possible solution is to shift the aerosol particles to larger particles in the gas flow by bipolar charged agglomeration. Taking the bipolar charged aerosol agglomeration in electrostatic precipitator as the research object, this project intends to use internal components and alternating electric field to accelerate the bipolar charged aerosol agglomeration. Through the building of computational fluid model which contains particles coulomb interaction and charged particle coagulation, the space distribution, the motion state and agglomeration velocity of charged particles will be analyzed. Combining with the experimental measurement results, the effect of the turbulence flow field and alternating electric field to bipolar charged aerosol agglomeration will be illustrated; the mechanism of the acceleration of bipolar charged aerosol agglomeration will be concluded. The prediction model

英文关键词： PM2.5；electrostatic precipitator；Computational Fluid Dynamics；two-fluid flow model；bipolar charged aerosol agglomeration