Producing and properties of zinc dust flames

Premixed and diffusion dust flames of zinc particles dispersed in the gas (particle size d 10  = 4.4 µm; metal mass concentration C f  = 0.40 kg/m 3 ) with propane additives of molar concentration C g  = (2-8)% are studied. Two different burning modes of zinc gas suspension are found. The conditions...

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Bibliographic Details
Published in:Combustion science and technology 2018-06, Vol.190 (6), p.1096-1109
Main Authors: Poletaev, N. I., Khlebnikova, M. Y., Khanchych, K. Y.
Format: Article
Language:English
Subjects:
Additives
Combustion
Combustion Products
Condensates
Dust
Evaporation
Flame Structure
Gas-Dispersed Synthesis
Low temperature
Metal concentrations
Nanorods
Needles
Oxide Particles Morphology
Particle Burning Mode
Zinc
Zinc dust
Zinc Dust Flames
Zinc oxide
Zinc oxides
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Summary:Premixed and diffusion dust flames of zinc particles dispersed in the gas (particle size d 10  = 4.4 µm; metal mass concentration C f  = 0.40 kg/m 3 ) with propane additives of molar concentration C g  = (2-8)% are studied. Two different burning modes of zinc gas suspension are found. The conditions of formation of these modes depend on the burning temperature of such systems. Two-zone structure of the flame-a zinc evaporation and combustion zone and a zinc vapor condensation zone-is observed. Its origin is explained by the unique specificity of a zinc burning process in contrast to other metals-zinc vapor does not react with oxygen in the gaseous phase, therefore, ZnO molecules and zinc oxide clusters are absent in the combustion zone. The morphology and dispersive composition of the condensed zinc oxide also depend on the gas suspension's burning mode. In a low-temperature burning mode of zinc dust, the combustion products mostly contain tetrapods, needles and nanorods of zinc oxide. At higher temperatures of the flame, zinc oxide nanorods prevail.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2018.1430029