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Enhancement of filtration efficiency by electrical charges on nebulized particles
Particuology ( IF 3.5 ) Pub Date : 2017-11-26 , DOI: 10.1016/j.partic.2017.07.008
Hui Chen , Zhenyi Zhang , Zhenzhong Zhang , Feng Jiang , Ruiming Du

There have been few investigations of effects of electrical charge, carried by lab-generated particles, on filtration efficiency testing. Here, we measured the elementary charge on particles and the fraction of particles carrying that charge with a combined electrometer, differential mobility analyzer, and scanning mobility particle sizer. A typical solid NaCl aerosol and liquid diethylhexyl sebacate (DEHS) aerosol were generated with Collison and Laskin nebulizers, respectively. Our experimental results showed that NaCl aerosols carried more charge after aerosol generation. The average net elementary charge per particle was approximately 0.07. The NaCl aerosol was overall positively charged but contained a mixture of neutral and charged particles. Individual particles could carry at most four elementary charges. According to constant theorem, we speculated that original NaCl aerosol contained 17% neutral, 45% positive-, and 38% negative-charged particles in the diameter range from 30 to 300 nm. A Kr-85 neutralizer was used to decrease the charge on the NaCl particles. Our results indicated that the DEHS aerosol was electrically neutral. The effects of electric charge on particle collection by electret and electroneutral high efficiency particulate air (HEPA) filters were analyzed. Theoretical calculations suggested that charges on original NaCl aerosol particles enhanced the filtration efficiency of HEPA filters.



中文翻译:

通过雾化颗粒上的电荷增强过滤效率

很少有关于由实验室产生的颗粒携带的电荷对过滤效率测试的影响的研究。在这里,我们使用静电计,差分迁移率分析仪和扫描迁移率粒度仪对颗粒物上的基本电荷以及带有该电荷的颗粒物的分数进行了测量。典型的固态NaCl气雾剂和癸二酸二乙基己基酯(DEHS)气雾剂分别由Collison和Laskin雾化器产生。我们的实验结果表明,气溶胶生成后,NaCl气溶胶携带更多电荷。每个粒子的平均净基本电荷约为0.07。NaCl气溶胶总体上带正电,但包含中性和带电粒子的混合物。单个粒子最多可以携带四个基本电荷。根据常数定理,我们推测原始的NaCl气溶胶包含直径范围为30至300 nm的17%中性,45%带正电和38%带负电的颗粒。使用Kr-85中和剂减少NaCl颗粒上的电荷。我们的结果表明,DEHS气溶胶是电中性的。分析了电荷对驻极体和电中性高效微粒空气(HEPA)过滤器收集颗粒的影响。理论计算表明,原始NaCl气溶胶颗粒上的电荷增强了HEPA过滤器的过滤效率。我们的结果表明,DEHS气溶胶是电中性的。分析了电荷对驻极体和电中性高效微粒空气(HEPA)过滤器收集颗粒的影响。理论计算表明,原始NaCl气溶胶颗粒上的电荷增强了HEPA过滤器的过滤效率。我们的结果表明,DEHS气溶胶是电中性的。分析了电荷对驻极体和电中性高效微粒空气(HEPA)过滤器收集颗粒的影响。理论计算表明,原始NaCl气溶胶颗粒上的电荷增强了HEPA过滤器的过滤效率。

更新日期:2017-11-26
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