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浙江大学学报(工学版)
浙江大学学报(工学版)
自动化技术、通信工程     
2种常用颗粒物粒径表征方法的对比
江建平, 骆仲泱, 陈浩, 周栋, 沙东辉, 方梦祥, 岑可法
浙江大学 能源清洁利用国家重点实验室,浙江 杭州 310027
Comparison of two conventional characterization methods of particle diameter
JIANG Jian ping, LUO Zhong yang, CHEN Hao, ZHOU Dong, SHA Dong hui, FANG Meng xiang, CEN Ke fa
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

从理论上推导常用的颗粒物光学散射体积等效直径和空气动力学当量直径之间的相关性,并分别运用马尔文激光粒度分析仪（Mastersizer 2000)和静电低压撞击器测试燃煤电站静电除尘器末级电场中飞灰颗粒物的光学散射体积等效粒径分布特征和空气动力学粒径数目浓度分布特征.通过将2种实验测试的颗粒物粒径分布数据进行对比研究,验证理论推导得出的2种颗粒物粒径表征方法的对应关系.通过扫描电子显微镜观测飞灰颗粒物的微观形貌特征.结果表明：颗粒物的空气动力学当量直径略大于其光学散射体积等效直径；对于外凸近似球形颗粒物,这2种等效直径可以相互转换,其转换关系不仅受到颗粒物和流体密度对颗粒物在流体中运动特性的影响,还受到颗粒物形态对颗粒物在流体中运动特性以及颗粒物光学检测结果的影响；同时,对于粒径大于1 μm的颗粒物,2种颗粒物粒径表征方法测得的颗粒物粒径分布之间的相对误差小于3%.
Abstract:

Relationship between optical scattering equivalent volume diameter and aerodynamic equivalent diameter were investigated using theoretical method. The volume distribution of optical scattering equivalent volume diameter and number distribution of aerodynamic equivalent diameter of fly ash particles sampled in an electrostatic precipitator’s last electric field from a coal fired power plant were investigated using a Mastersizer 2000 and an electrical low pressure impactor (ELPI), respectively. Experimental data were compared to verify the relationship between two conventional characterization methods of particle diameter deduced by the theoretical method. The fly ash particle microstructures were analyzed using a scanning electron microscope (SEM), and fly ash particle was convex spherical particle according to the SEM photos. Results indicate that aerodynamic equivalent diameter of particulate matter is little bigger than its optical diameter and can transform one to another for convex spherical particles. The transformation between aerodynamic equivalent diameter and optical diameter is affected not only by the density of particles and fluid, but also by the form of particles. For the two particle size distribution measurements, the relative error is less than 3% for the particle with a diameter larger than 1 μm.
出版日期: 2015-12-31
:  TN 249  
基金资助:

 国家”973”重大基础研究发展规划资助项目(2013CB2285 04).
通讯作者: 骆仲泱,男,教授. ORCID:0000 0001 8764 2986.     E-mail: zyluo@zju.edu.cn
作者简介: 江建平（1987—）,男,博士生,要从事燃煤电厂细颗粒物及其他污染物的控制研究. ORCID:0000 0001 6624 5594.
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引用本文:

江建平, 骆仲泱, 陈浩, 周栋, 沙东辉, 方梦祥, 岑可法. 2种常用颗粒物粒径表征方法的对比[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2015.12.012.

JIANG Jian ping, LUO Zhong yang, CHEN Hao, ZHOU Dong, SHA Dong hui, FANG Meng xiang, CEN Ke fa. Comparison of two conventional characterization methods of particle diameter. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2015.12.012.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2015.12.012    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I12/2326

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