凝聚式单分散气溶胶发生方法研究

Study on Condensation Type Mono-dispersion Aerosol Generation Method

自行设计建立了一套凝聚式单分散气溶胶发生实验装置。采用蒸发冷凝法,用不同浓度的NaCl溶液作为凝结核源,并分别采用DEHS(癸二酸二异辛酯)、DOP(邻苯二甲酸二辛酯)、PAO-4(聚癸烯,俗称金刚砂3004)作为试剂,进行了气溶胶的发生试验以及气溶胶性能测试。结果表明,严格控制各种影响气溶胶性能的参数,三种试剂均能发生出单分散气溶胶粒子(几何标准偏差σg≤1.25),粒径范围分别为DEHS(0.33～0.36μm)、DOP(0.35～0.37μm)、PAO-4(0.36～0.37μm),粒子数浓度均达到106粒/cm3以上。该装置产生的单分散气溶胶粒径特征和浓度基本符合高效粒子空气过滤器效率测试要求。

A condensation mono-dispersion aerosol generation device was designed and set up,by using evaporation-condensation method,with different concentrations of NaC1 solution as a source of condensation nuclei,and using reagents DEHS（di-2-ethyl hexyl sebacate）,DOP（Di-n-octyl-o-phthalate）,PAO-4（1-decene,tetramer mixed with 1-decene,commonly known as Emery 3004）,respectively,as liquid aerosol source materials.Aerosol generation was carried out,together with related tests.The results showed that mono-dispersion aerosols were produced（the geometric standard deviation σg less than 1.25）by using three kinds of reagents when various performances of the aerosols were controlled strictly,with the geometric mean diameter dg in the range of 0.33—0.36 μm for DEHS,the geometric mean diameter dg in the range of 0.35—0.37 μm for DOP,the geometric mean diameter dg in the range of 0.36—0.37 μm for PAO-4,the concentrations of the aerosols larger than 106 cm-3.The device meets the requirements of HEPA filter efficiency testing as far as crucial properties and concentration of the mono-dispersion aerosol are met.