用于HEPA滤料效率检测的蒸发冷凝技术  

Evaporation-condensation technology for testing the efficiency of HEPA filter media

作　　者：江锋[1] 庄子威[1] 张振中[1] 尉继英[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《清华大学学报（自然科学版）》2014年第5期629-632,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50978154;50608044)

摘　　要：明确蒸发冷凝技术产生准单分散气溶胶的发生效果及其与数值模拟的吻合程度,可以应用于高效(high efficiency particulate air,HEPA)滤料计数效率的测量,使其兼具测量速度快和可测效率范围宽的优点。通过Euler-Lagrange模型数值模拟计算和扫描电迁移率粒度分析仪(scanning mobility particle sizers,SMPS)实验测量,研究了不同参数条件下,蒸发冷凝装置产生气溶胶的粒径分布状况。研究结果表明:模拟结果与实验数据吻合程度较高;Euler-Lagrange模型适用于模拟冷凝管中气溶胶的生长规律;通过调节发生器的参数可产生不同粒径的高浓度准单分散气溶胶。气溶胶粒径分布不仅完全满足HEPA滤料效率检测要求,而且可以应用于超高效(ultra low penetration air,ULPA)滤料效率检测。Quasi-monodispersed aerosols can be generated by an evaporation-condensation generator.The aerosol characteristics and the differences between models and experiments need to be understood for testing the use of high efficiency particulate air（HEPA）filters to get both high measurement speeds and wide ranges of filters efficiencies.The size distributions of the aerosol particles generated by the evaporation-condensation generator are analyzed for various spring parameters through numerical simulations using the Euler-Lagrange modeling method and experimental measurements using a scanning mobility particle sizes（SMPS）.The results show that the simulations are quite consistent with the experimental data,so the Euler-Lagrange modeling method can be applied to simulate aerosol growth in the condensation tube.Different sizes of high-concentration,quasi-monodisperse aerosols can be generated by changing the generator operating parameters.The size distribution not only meets the HEPA filter media efficiency testing standard but can also be used for ultra low penetration air（ULPA）filter media efficiency testing.

关 键 词：气溶胶发生 效率检测 蒸发冷凝技术 高效(high EFFICIENCY PARTICULATE AIR HEPA)滤料 

分 类 号：O648.18[理学—物理化学] X513[理学—化学]