在粉體填裝過程中奈米粉體的特性對空氣逸散的影響

The Effect of Characteristics of Nanopowders on Airborne Emission in the Powder-Filling Process

李書安(Shu-An Lee) ； 柯偉祥(Wei-Hsiang Ko) ； 廖千驊(Chien-Hua Liao) ； 陳春萬(Chun-Wan Chen) ； 蔡春進(Chun-Jian Tsai)

《勞工安全衛生研究季刊》 20卷4期 (2012/12) Pp. 452-462

https://doi.org/10.7005/JOSH.201212.0452

摘要

本研究主要是探討在粉體填裝過程中，奈米粉體的特性（例如：種類、大小、形狀與有效密度）對粉體逸散至空氣中的影響。實驗於20m^3之通風換氣室中進行奈米粉體填裝過程的逸散試驗。奈米粉體以螺旋式下料桿填充系統（auger-type filling system）進行下料，再以Electrical Low Pressure Impactor（ELPI）即時量測奈米粉體在填裝過程逸散至空氣中的情形。結果發現8~10 μm的二氧化矽粉體為受試粉體中逸散至空氣的濃度最高。10~30 nm的奈米氧化鋁逸散至空氣中的濃度較微米以及次微米的粉體高。球狀奈米氧化鋅比針狀奈米氧化鋅在空氣中微粒的逸散濃度高。不論粉體的形狀與大小，粉體的逸散量與粉體的有效密度呈現負相關。另外，奈米粉體、次微米粉體以及微米粉體，多以微米以及次微米的形式存在於空氣中。因此，要控制奈米粉體在填裝過程中的逸散，必須從奈米粉體種類、粒徑大小、形狀以及密度去做規範。

關鍵字

奈米粉體 ； 逸散 ； 螺旋式下料桿填充系統 ； 有效密度

並列摘要

This study is to investigate the effect of the characteristics of nanopowders (such as type, size, shape and density) on airborne emission of nanopowders in the powder-filling (PF) process. The experiment was conducted in a 20 m3 ventilation chamber to investigate the fugitive particles in the PF process. Nanopowders were unloaded using an auger-type filling system and then measured timely for airborne emission in the PF process using an electrical low pressure impactor (ELPI). The results show that the airborne concentrations of 8~10 μm SiO2 powders were found to be the greatest among all the tested powders. The airborne concentrations of fugitive particles were found to be higher for 10~30 nm Al2O3 nanopowders than those for micro- and submicro- powders. The airborne concentrations of fugitive particles were higher for ball-shape ZnO nanopowders than those for needle-shape ones. Regardless of shape and size, the airborne emission of powders was negatively associated with the apparent density of powders. In addition, the airborne emission of nano-, submicro- and micropowders were mostly presented in the micro-and submicro- size range. Therefore, in order to control fugitive particles in the PF process, it is necessary to regulate the type, size, shape and density of nanopowders.

並列關鍵字

Nanopowder ； Emission ； Auger-type filling system ； Apparent density

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