Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Influence of Electrostatic Discharge Circuit Parameters on the Minimum Ignition Energy of Suspended Dust Clouds

분진운의 최소점화에너지에 대한 정전기 방전회로의 매개변수 영향

  • Moon, Kyoon-Tae (The Graduate School of Energy and Environment, Seoul National University Science and Technology) ;
  • Chung, Jae-Hee (The Graduate School of Energy and Environment, Seoul National University Science and Technology) ;
  • Yamaguma, Mizuki (Japan National Institute of Occupational Safety and Health) ;
  • Choi, Kwang-Seok (Japan National Institute of Occupational Safety and Health)
  • 문균태 (서울과학기술대학교 에너지환경대학원) ;
  • 정재희 (서울과학기술대학교 에너지환경대학원) ;
  • 미주키 야마구마 (일본노동안전위생종합연구소) ;
  • 최광석 (일본노동안전위생종합연구소)
  • Received : 2010.07.12
  • Accepted : 2010.10.06
  • Published : 2010.10.31
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Abstract

The ignitability(minimum ignition energy, MIE) of a suspended dust clouds is very important aspect of technical safety indices. This paper reported the experimental results dealing with the influence of discharge circuit on the MIE of a suspended dust clouds. The movement of a suspended dust clouds was also observed with the high speed camera. The Hartmann vertical-tube apparatus(MIKE-3) described in the international standard of IEC and Polypropylene (PP, 50% volume-average, D50: $761{\mu}m$) resin powders were used in this experiment. The following results were obtained: (1) the MIE of a suspended PP powder depended markedly on the discharge circuit; in other words, when a resistor was connected in series with the discharge sparking circuit(RC), the lowest value(31mJ) of MIE was obtained for a suspended PP powder comparison with the other circuits(C circuit; 370mJ or LC circuit; 71mJ). (2) the discharge duration time is more important than other factors with regard to MIE of a suspended PP powder.

Keywords

References

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