Biomass explosion testing: Accounting for the post-test residue and implications on the results |
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| Institution: | 1. Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal;2. Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Av. Complutense s/n, 28040, Madrid, Spain;3. Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Rua Conselheiro Emídio Navarro 1, 1959-007, Lisboa, Portugal;1. Environmental Engineering Department, Al-Hussein Bin Talal University, Ma’an 71111, Jordan;2. Institute of Combustion and Power Plant Technology (IFK), University of Stuttgart, Pfaffenwaldring 23, 70569 Stuttgart, Germany;3. Chemical Engineering Department, Jordan University of Science and Technology, Irbid 22110, Jordan;1. Flame & Explosion Laboratory, CSIR- Central Institute of Mining & Fuel Research, Dhanbad 826015, India;2. Department of Mechanical Engineering, Indian School of Mines, Dhanbad 826004, India;3. Department of Electronics Engineering, Indian School of Mines, Dhanbad 826004, India;1. Department of Mechanical Engineering, University of Ottawa, Ottawa, Canada;2. School of Mathematics, University of Leeds, Leeds, UK;3. Blue Dog Scientific Ltd., Wakefield, UK;1. Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany;2. Karlsruhe Institute of Technology (KIT), Kaiserstraße 12, 76131 Karlsruhe, Germany |
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| Abstract: | This work uses the ISO 1 m3 dust explosion equipment to study the explosion properties and combustion characteristics of pulverized biomass dust clouds. An unreported feature of this apparatus is that in rich concentrations only about half the dust injected is burned in the explosion, while the overpressures remain high. This work was undertaken to try to understand the mechanisms of these phenomena, through the accounting of the debris at the end of the explosion, some of which was found in the form of impacted “cake” against the vessel wall. One possible explanation is that the residue material was biomass dust blown ahead of the flame by the explosion induced wind, impacted on the walls where then the flame side underwent flame impingement pyrolysis and the metal (wall) side material was compacted but largely chemically unchanged. The results also show that the heat transfer insulation provided by the powder wall layer contributes to the higher observed pressures. The risk of explosion with significant overpressures remains at 100% in very rich environments (equivalence ratios of up to 6) although these environments are leaner than thought due to material sequestration within the “cake”. There was little indication that a rich combustion limit was approached, this was determined in standard testing equipment that has been modified and calibrated to handle larger quantities of powder than normal. |
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| Keywords: | Dust explosions Combustion residue Mass burnt |
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