Course of explosion behaviour of metallic powders - From micron to nanosize

JOURNAL OF HAZARDOUS MATERIALS

卷:379

Article

Vignes, Alexis¹  Krietsch, Arne²  Dufaud, Olivier³  Santandrea, Audrey^1,3  Perrin, Laurent³  Bouillard, Jacques¹ 

[1] INERIS, Accid Risks Div, Parc ALA TA,BP 2, F-60550 Verneuil En Halatte, France

[2] BAM Bundesanstalt Mat Forsch & Prufung BAM, Div Explos Protect Gases & Dusts 2 1, Eichen 87, D-12205 Berlin, Germany

[3] Univ Lorraine, CNRS, Lab React & Genie Proc, UMR 7274, 1 Rue Granville,BP 20451, F-54001 Nancy, France

关键词: Dust explosion;    Metallic powders;    Nanopowder;    Nanomaterials;   

DOI  :  10.1016/j.jhazmat.2019.120767

来源: Elsevier

【 摘 要 】

This work presents an overview about the explosion behaviour of metallic powders from micron to nanosize. Aluminium, magnesium, titanium, iron and zinc were considered and their explosion safety parameters were analysed as a function of their mean primary particle size either determined by BET measurements, particle size distribution. To depict the course of explosion behaviour for these metals, extensive literature review has been performed and additional experimental tests were also performed. Generally, decreasing the particle size in a metallic powder leads to a higher explosion severity. It appears that this statement is true till a critical diameter below which the explosion severity (p(max), dp/dt(max)) decreases for all the considered powders. This critical size can be explained by theoretical considerations on the nature of thermal transfer in the flame, namely by analysing the Cassel model. Finally, semi-empirical models were also developed for aluminium to highlight the specific micrometre and nanometre behaviour and the influence of turbulence, particle burning time, diameter and concentration. The influence of these key parameters needs to be further assessed in a future work in order to better understand the mechanisms involved and to extend the scope to other powdered materials.

【 授权许可】

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