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Article

Particle Size Influence on the Transport Classification Labels and Other Flammability Characteristics of Powders

1
Department of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, Ríos Rosas 21, 28003 Madrid, Spain
2
Laboratorio Oficial Madariaga, LOM (UPM Technical University of Madrid, Spain), C/Eric Kandel, 1 e (TECNOGETAFE), Parque Científico y Tecnológico de la UPM, 28906 Getafe, Spain
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(23), 8601; https://doi.org/10.3390/app10238601
Received: 16 October 2020 / Revised: 10 November 2020 / Accepted: 26 November 2020 / Published: 1 December 2020
(This article belongs to the Special Issue Flammability, Dust and Gas Explosions)
Dust explosions and fires pose an industrial safety problem, due to the human and material losses caused by them. As many fuel processes and material transport generate powder particles, the effect of granulometry in different flammability properties has been studied to define the relationship between both. Deep knowledge of this relationship reduces the self-ignition and self-combustion processes, and the accidents associated with these processes. In this study, six different samples, including biomass, charcoal, and dog food, are tested in three different particle sizes, so differences in their flammability behavior could be appreciated (not only considering fine particles, but also coarse samples). The transport classification test was carried out, obtaining significant results in two samples, where the same material did not self-ignite when tested at its coarse size, but it did when tested at fine particle size. Similar results were obtained when analyzing initial temperature for related-combustion gasses emission: the finer the particle size, the lower the initial temperature. To understand the heat mechanisms, thermal analyses were performed, such as thermogravimetric analysis and differential scanning calorimetry. Finally, a self-ignition risk was assessed for all samples according to their activation energy and characteristic temperature. All the test results lead to conclude that biomasses easily start self-heating process, but its composition difficult the heat transmission to reach self-ignition, while charcoals are more susceptible to self-ignition. View Full-Text
Keywords: self-ignition; self-combustion; particle size; biomass; transport classification; thermogravimetry analysis self-ignition; self-combustion; particle size; biomass; transport classification; thermogravimetry analysis
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MDPI and ACS Style

Castells, B.; Amez, I.; Medic, L.; García Torrent, J. Particle Size Influence on the Transport Classification Labels and Other Flammability Characteristics of Powders. Appl. Sci. 2020, 10, 8601. https://doi.org/10.3390/app10238601

AMA Style

Castells B, Amez I, Medic L, García Torrent J. Particle Size Influence on the Transport Classification Labels and Other Flammability Characteristics of Powders. Applied Sciences. 2020; 10(23):8601. https://doi.org/10.3390/app10238601

Chicago/Turabian Style

Castells, Blanca, Isabel Amez, Ljiljana Medic, and Javier García Torrent. 2020. "Particle Size Influence on the Transport Classification Labels and Other Flammability Characteristics of Powders" Applied Sciences 10, no. 23: 8601. https://doi.org/10.3390/app10238601

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