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Flame Spreading Over Metal Dust Deposits With Particles Size  

Han, Ou Sup (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA))
Choi, Yi Rac (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA))
Han, In Soo (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA))
Lee, Jung Suk (Chemical Hazard Research Team, Center for Chemical Safety and Health, Occupational Safety & Health Research Institute (KOSHA))
Publication Information
Korean Chemical Engineering Research / v.48, no.5, 2010 , pp. 603-608 More about this Journal
Abstract
A study has been conducted experimentally to investigate behavior of ignition and flame spread over metal dust deposits with particle size using by a developed apparatus and thermogravimetric analysis(TGA). Zr, Ta and Mg-Al(90:10 wt%) alloy metal powders including Mg and Ti with different particle size were used. Also we used PMMA(Polymethylmethacrylate) powder to compare the combustion properties to those of metal powders. When dust layers were more than 5 mm in thickness, the dependency of deposit depth on flame spread rate over dust layer was not shown. With decreasing mean particle diameter, flame spread rate over Ti dust layer decreased, while the spread rate over Mg dust layer increased. For mean diameter of $51{\mu}m$, fire spread rate over pure Mg dust layer decreased to about 50 percent in Mg-Al(90:10 wt%) dust layer. The oxide thickness of metal dust used in this study tended to be inversely proportional with the spread rate, and it was quite small for influence with particle size. From the results of TGA for Ti and Mg, weight increasing curves(550 for Mg, 578 for Ta) were observed in the oxidation process, and they seems to be caused by ignition of upper dust layer.
Keywords
Metal Powders; Dust Deposit; Flame Spread; Particle Size; Spread Rate;
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