A study on the ignition characteristics for dust explosion of industrial wastes |
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| Institution: | 1. Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, T.H. Chan School of Public Health, Harvard University, Boston, MA, United States;2. Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, PR China;3. Cyprus International Institute for Environmental and Public Health, Cyprus University of Technology, Limassol, Cyprus;4. U.S. Consumer Product Safety Commission, Office of Hazard Identification and Reduction, Rockville, MD, United States;5. Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States;6. Department of Pharmaceutical Sciences, Mary Babb Randolph Cancer Center, West Virginia University, Morgantown, WV, United States;1. Reaction and Chemical Engineering Laboratory (LRGP), University of Lorraine, UMR 7274 CNRS, 1, rue Grandville, BP 20451, 54 001 Nancy, France;2. Chemical Engineering Department, Universidad de Los Andes, Colombia, Carrera 1 Este 19 A 40, Bogotá, Colombia |
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| Abstract: | Paying attention to accidents related to recycling, the authors investigated factors related to the dust explosions. The minimum explosive concentrations were 30–40 g/m3 (polyurethane and plastic dusts) and 70 g/m3 (toner); the explosibility was reduced by about 40% when combustible gas (cyclopentane) existed together with the dust; ignition temperature of a dust cloud was around 500 °C; and the minimum ignition energy was about 11 mJ (polyurethane). Ignition energy was the minimum when the spark duration was about 0.2 ms or more; the explosion probability was the maximum when the spark gap was 5–10 mm; and the ignition energy was the minimum when the electrode tip angle was around 30 °C (polyurethane). From these findings, the dusts produced in the recycling process can be easily evaluated so as to know whether dust explosion is likely to occur. |
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