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Ignition of dust-air atmospheres by ultrasonic waves

Author(s): Lars Hendrik Simon, V. Wilkens, T. Fedtke and M. Beyer
Year: 2012
Conference name: International Symposium of Hazard, Prevention and Mitigation of Industrial Explosions
Conference place: Krakau
Conference date: 22.07.-27.07.2012
Abstract: This paper shows the results of our investigations on the ignition source ultrasound in
dust-air atmospheres. Ultrasound is, on the one hand, considered to be an ignition
source (EN 1127-1:2007). On the other hand, though, it is used for various
applications in gases and air, such as level measurement, dust agglomeration
(De Sarabia et al. 2000), particle size fractionation (Budwig et al. 2010) or potentially
for the production of powder coatings (Hemsel et al. 2005), and no explosion
accidents have yet been reported. Our research now shows that it is indeed possible to
ignite dust-air mixtures in ultrasound fields under certain conditions. We conducted
our experiments in an ultrasound standing-wave field and used maize starch, calcium
stearate and sulfur dust. For ignitions, an absorbing target was needed to convert the
acoustic energy into heat. From theoretical estimations and experiments critical
conditions that provoke ultrasonically triggered explosions are identified.

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Dr. Michael Beyer
Tel.: 0531-592-3700
Fax: 0531-59269-3700
E-Mail: Michael Beyer

Sekretariat Carola Lotz-Förster
Tel.: 0531-592-3701
Fax: 0531-592-693701
E-Mail: Carola Lotz-Förster
Anschrift Physikalisch-Technische Bundesanstalt
Arbeitsgruppe 3.73
Bundesallee 100
38116 Braunschweig