Particle contamination is a common contributing factor for ignition in oxygen service. Metallic particle ignition and combustion in pressurized gaseous oxygen have been investigated by PIMM Laboratory (French National Centre for Scientific Research) and Air Liquide over the past 3 years. Metallic particles are ignited by a laser promoter, and a fast camera calibrated as an optical pyrometer is used to monitor ignition and combustion propagation. Typical outputs of the test are the ignition characteristics of particles (minimum ignition energy, or MIE, and ignition temperature), the combustion characteristics (temperature achieved during combustion, heat of combustion released by the combustion of particles and transferred to the underlying surface), and the consequences for the underlying metallic wall that is in contact with the burning particles (heat-affected depth, loss of confinement and extension of combustion propagation). These results are valuable inputs for assessing oxygen fire risk. The purpose of this paper is to present the abovementioned ignition and combustion behaviors of metallic particles in static gaseous oxygen at several pressure levels. Particle test parameters are mass, thickness of the particle layer, and chemical composition (pure iron, oxidized iron, SS316L, Inconel 625, and actual particles collected from industrial operations). Particles are deposited on metallic supports (copper, SS316L, Inconel 625) and ignited by low-power laser irradiation. The heat transfer to the underlying metallic support is determined for the support made of copper. The impact of particles burning on the support is illustrated for supports made of Inconel 625 exposed to SS316L particles and for supports made of SS316L and exposed to pure iron particles. A heat-transfer model, associated with a reverse identification and temperature measurement by thermocouples that allow for the calculation of the power transmitted by particle combustion, supports the interpretation of experimental results and their significance for structural integrity and oxygen fire-risk assessment.
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