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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 pmax, Maximum Explosion Pressure Rise (dp/dt)max and Lower Explosion Limit LEL are determined in closed vessels such as the 20-L-sphere according to international standards. Dust ignition is earned 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 "ruse 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 pmax and (dp/dt)max 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 m 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.
Validation of the New Ignition Source "Exploding Wire" for Dust Explosion Testing in the 20-L-Sphere
The safety characteristics Maximum Explosion Pressure pmax, Maximum Explosion Pressure Rise (dp/dt)max and Lower Explosion Limit LEL are determined in closed vessels such as the 20-L-sphere according to international standards. Dust ignition is earned 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 "ruse 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 pmax and (dp/dt)max 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 m 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.
Validation of the New Ignition Source "Exploding Wire" for Dust Explosion Testing in the 20-L-Sphere
Krietsch, Arne (author) / Kwangvitayanon, Yolada (author) / Schmidt, Martin (author) / Klippel, Alexander (author) / Schröder, Volkmar (author) / Scheid, Marc (author)
2014
7 Seiten, Bilder, Tabellen, 12 Quellen
Conference paper
English