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Titel: Ignition of dust-air atmospheres by ultrasonic waves
Autor(en): L. H. Simon, V. Wilkens, T. Fedtke und M. Beyer
Jahr: 2012
Konferenz Name: International Symposium of Hazard, Prevention and Mitigation of Industrial Explosions
Konferenz Datum: 22.07.-27.07.2012
Zusammenfassung: 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