Experimental study on the relationship between the charge amount of polypropylene granules and the frequency of electrostatic discharges while silo loading |
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| Institution: | 1. National Institute of Occupation Safety and Health, Japan, 1-4-6, Umezono, Kiyose, Tokyo, Japan;2. Kasuga Denki INC, 2-4 Shinkawasaki, Saiwai, Kawasaki, Kanagawa, Japan;1. Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, 630090 Novosibirsk, Russian Federation;2. Novosibirsk State University, 630090 Novosibirsk, Russian Federation;3. Nikolaev Institute of Inorganic Chemistry SB RAS, 630090 Novosibirsk, Russian Federation;1. Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada;2. National Institute of Occupational Safety and Health, 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan |
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| Abstract: | This paper is a report on the relationship between the charge amount (charge to mass ratio, q/m) of polypropylene (PP, 2–3 mm) granules and the frequency of electrostatic discharges that occur while loading a metal silo. The feedback control system was used in order to control the q/m of PP granules. The electrostatic discharges inside the silo were also observed using a conventional image-intensifier system. The charging control range for PP granules was from 0 to −12 μC/kg in the q/m. The results obtained from the experiments show that (1) two kinds of electrostatic discharges were clearly observed inside a metal silo while loading PP granules, i.e., brush discharges and incendiary bulk surface discharges; (2) the number of brush discharges and incendiary bulk surface discharges increased with the increase in the q/m of PP granules, almost reaching saturation; and (3) brush discharges and incendiary bulk surface discharges began to occur at the −1.16 μC/kg and −2.33 μC/kg points in the q/m, respectively, in this study. |
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| Keywords: | Electrostatic charges Electrostatic discharges Granules Polypropylene Silo |
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