一种用于单颗粒质谱的空气动力学颗粒浓缩装置仿真设计与试验研究  

Improved Aerodynamic Particle Concentrator for Single Particle Aerosol Mass Spectrometry:A Simulation and Characterization Study

作　　者：卓泽铭 苏柏江 谢芹惠 李磊 黄正旭 周振 麦泽彬 谭国斌 ZHUO Zeming;SU Bojiang;XIE Qinhui;LI Lei;HUANG Zhengxu;ZHOU Zhen;MAI Zebin;TAN Guobin(Institute of Mass Spectrometry and Atmospheric Environment,Jinan University,Guangzhou 510632,China;Guangzhou Hexin Instruments Co.,Ltd.,Guangzhou 510700,China)

机构地区：[1]暨南大学质谱仪器与大气环境研究所,广州510632 [2]广州禾信仪器股份有限公司,广州510700

出　　处：《真空科学与技术学报》2021年第5期443-449,共7页Chinese Journal of Vacuum Science and Technology

基　　金：国家重点研发计划项目(编号:2017YFB1103903);广东省自然科学基金-博士启动纵向协同项目(编号:2017A030310384);广东省国际科技合作项目国际合作项目(编号:2018A050506020);广州开发区国际科技合作项目(编号:2018GH08)。

摘　　要：为提高在线单颗粒质谱SPAMS对低浓度环境下颗粒物的检测效率,本研究设计了一种基于虚拟撞击原理的空气动力学气溶胶浓缩装置。结合计算流体动力学Fluent仿真软件,对传统临界孔进样结构进行改进,孔径从原来的0.11 mm扩张至0.22 mm,并引入一个额外的前级泵抽离多余气体,使得SPAMS能在质谱真空压力不变的的情况下,将颗粒物从多余气体分离进入质谱检测系统,实现颗粒物浓缩进样。结果表明:颗粒浓缩倍数仿真值与实验值较为吻合,进样流量较原来提升3.4倍,在粒径0.2-5μm范围内,环境空气的颗粒浓缩倍数为3-8倍左右;气溶胶浓缩进样装置不仅能够实现颗粒浓缩进样,还提高了SPAMS对粗颗粒物的进样能力。In order to improve the detection efficiency of single particle aerosol mass spectrometry(SPAMS) on low level particles in the environment, an improved aerodynamic particle concentrator(APC) was developed.Based on the CFD simulation software FLUENT and the principle of the virtual impactor to concentrate particles, the traditional critical orifice sampling structure was improved, and the critical orifice size was enlarged from 0.11 mm to 0.22 mm.In addition, an additional rotary pump is introduced to exhaust the excess gas, which enables SPAMS to separate the particles from the excess gas into sample gas under the stable vacuum system.This device enables SPAMS to separate particles from the excess gas under the stable vacuum system before they are transported to the mass spectrometry inlet.The results show that the simulation value of particle concentration ratio is in good agreement with the experimental value, and the sample flow rate is increased by 3.4 times.When the particle size is in the range of 0.2-5 μm, the concentration ratio of ambient air particles is about 3-8 times.The aerosol concentration sampling device can not only realize the particle concentration and injection, but also improve the injection capacity of SPAMS for coarse particles.

关 键 词：空气动力学颗粒浓缩器 临界孔 SPAMS 数值模拟 进样效率 

分 类 号：TH843[机械工程—仪器科学与技术] O35[机械工程—精密仪器及机械]