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Validation of the new ignition source 'exploding wire' for dust explosion testing in the 20-L-sphere

  • The safety characteristics Maximum Explosion Pressure pniB, Maximum Explosion Pressure Rise (dp/dt)™* and Lower Explosion Limit LEL are determined in closed vessels such as the 20-L-sphere according to international Standards. Dust ignition is carried out using pyrotechnical igniters which are defined in the Standards. Due to various disadvantages of pyrotechnical igniters the need for alternative ignition sources arises again and again. Studies at the Federal Institute for Material Research and Testing (BAM) with ignition units which were able to generate ignition energies up to 2000 J showed that the so-called “exploding wire” or “fuse wire“ is suitable as an alternative ignition source. The paper presents further test results for the Validation of the exploding wire for the determination of Pm» and (dp/dt)mx in the 20-L-sphere. The tests were performed with a new ignition unit and improved electrodes which allowed ignition energies up to 10000 J. The paper also analyses propagationThe safety characteristics Maximum Explosion Pressure pniB, Maximum Explosion Pressure Rise (dp/dt)™* and Lower Explosion Limit LEL are determined in closed vessels such as the 20-L-sphere according to international Standards. Dust ignition is carried out using pyrotechnical igniters which are defined in the Standards. Due to various disadvantages of pyrotechnical igniters the need for alternative ignition sources arises again and again. Studies at the Federal Institute for Material Research and Testing (BAM) with ignition units which were able to generate ignition energies up to 2000 J showed that the so-called “exploding wire” or “fuse wire“ is suitable as an alternative ignition source. The paper presents further test results for the Validation of the exploding wire for the determination of Pm» and (dp/dt)mx in the 20-L-sphere. The tests were performed with a new ignition unit and improved electrodes which allowed ignition energies up to 10000 J. The paper also analyses propagation of flame and electrical arc on basis of high speed camera recordings. Turbulence measurements with a LDA System in the 20-L-sphere allowed investigation whether the activation of the ignition sources has an influence on the turbulence field generated during dust dispersion and whether the influence differs depending on the ignition source.zeige mehrzeige weniger

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Metadaten
Autor*innen:Arne Krietsch, Yolada Kwangvitayanon, Martin Schmidt, Alexander Klippel, Volkmar Schröder, M. Scheid
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Hazards 24 Symposium (Proceedings)
Jahr der Erstveröffentlichung:2014
Herausgeber (Institution):Institution of Chemical Engineers (IChemE), UK
Jahrgang/Band:159
Erste Seite:1
Letzte Seite:7
Freie Schlagwörter:Dust explosion testing; Exploding wire; Explosion characteristics; Ignition source
Veranstaltung:Hazards 24 Symposium
Veranstaltungsort:Edinburgh, UK
Beginndatum der Veranstaltung:07.05.2014
Enddatum der Veranstaltung:09.05.2014
ISBN:978-0-85295-582-6
Bemerkung:
Serientitel: IChemE Symposium Series – Series title: IChemE Symposium Series
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:11.08.2014
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