气溶胶粒子通过填充柱的保留时间分布测定  

Experimental Measurements of Distribution of Retention Time for Aerosol Particles through Packed Column

作　　者：杨通在[1] 陈银亮[1] 熊旺[1] 羊衍秋[1] 马浚[1] 叶仕有[1] 刘亦农[1] 余忠金[1] 宋涛[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《物理化学学报》2003年第7期605-609,共5页Acta Physico-Chimica Sinica

摘　　要：采用亚微米单分散聚苯乙烯球形硬气溶胶粒子和脉冲进样技术,测定了气溶胶粒子通过无规则石英砂填充柱的保留时间分布,从保留时间分布曲线得到了气溶胶粒子在填充柱中的平均保留时间和穿透率.研究了平均保留时间和穿透率与流体流速、填充柱的长度、填料粒度和气溶胶粒子大小之间的关系.研究发现,流速越大,保留时间分布曲线越尖锐,流速越小,保留时间分布曲线越平坦;气溶胶粒子的穿透率随着柱长的增加而降低,随流速、气溶胶粒子粒径和石英砂颗粒大小的减小而减小;平均保留时间随柱长增加而增大,随流速增大而减小,随气溶胶粒子粒径减小而减小,而与石英砂颗粒大小几乎无关.Principles of aerosol transport mechanics are widely used to describe the performance of various sampling, filtration and aerosol processing devices, and to the prediction of their main parameters of engineering interest. Previous studies have aimed at the transport of aerosol flow in tubes, there are few studies of aerosol transport mechanics in packed columns. In this paper, the experimental method used in the investigation was the real-time measurements of the time-dependent aerosol particles concentration at the outlet of the packed columns, when submicrometer monodispersed solid spherical polystyrene aerosol particles were instantaneously introduced at the inlet to clean nitrogen flowing through the irregular-shaped quartz random-packed columns. The mean retention time and penetration were derived from the distribution of retention time. The results showed that flow velocity of the carrier gas, packed column length,,aerosol particles size and quartz size effected the mean retention time and penetration of aerosols. The longer the packed column, the slower the flow velocity and the smaller aerosol particles size and quartz size, the lower the penetration coefficients. The mean retention time of aerosol particles increased with packed column length, decreased with the flow velocity increased, and was almost independent of the quartz size. The results obtained can be used to filtration and purification of aerosol particles.

关 键 词：气溶胶 粒子 填充柱 保留时间 分布 测定 穿透率 亚微米 

分 类 号：O648[理学—物理化学]