Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on Minimum Ignition Energy of Flammable Mixtures by Electric Power Frequency

전원주파수의 변화에 따른 인화성 혼합기체의 최소점화에너지에 관한 실험 연구

  • 최상원 (한국산업안전보건공단 산업안전보건연구원)
  • Received : 2012.02.06
  • Accepted : 2012.06.05
  • Published : 2012.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

With a progress of electrical and electronic technology, radio-frequency including high frequency components are widely to various industrial installations. Some of them are used in hazardous locations where explosive or flammable gases exist. As a result, ignition of such gases may be induced by a spark discharge when the radio frequency circuits are switched on or off. The purpose of this study is to investigate the ignition hazards of some kind of flammable mixtures based on the IEC 60079-11 publication. In this experiment, we used a high frequency resistive circuit which consists of a co-axial cable, a 20 ${\Omega}$, 30 ${\Omega}$, 40 ${\Omega}$ and 50 ${\Omega}$ resistor and two kind of power amplifier with frequency range up to almost 1 MHz and 50 MHz. Experimental results show that the ignition of the acetyleneair, ethylene-air mixtures and methane-air mixtures due to spark discharge depends primarily on the frequency of the power source in the resistive circuit the minimum ignition voltage increases gradually with the increase of the frequency.

Keywords

References

  1. BS 6656, "Prevention of inadvertent ignition of flam mable atmospheres by radio-frequency radiation", 2002.
  2. G. H. Butcher, P. S. Excell and D. P. Howson, "The Ignition Hazard Due to Radiation from Radio Transmitters", Postgraduate School of Electrical and Electronic Engineering, University of Bradford, UK, pp. 143-147, 1975.
  3. A. J. Maddocks, and G. A. Jackson, "Measurements of Radio Frequency Voltage and Power Induced in Structures on the St Fergus Gas Terminals", The Radio and Electronic Engineers, Vol. 51, No. 4, pp. 187-194, April 1981 https://doi.org/10.1049/ree.1981.0024
  4. D. P. Howson, P. S. Excell and G. H. Butcher, "ignition of flammable gas/air mixtures by sparks from 2MHz and 9MHz sources", The Radio and Electronics Engineers, Vol. 51, No. 4, pp. 170-174, 1981. https://doi.org/10.1049/ree.1981.0022
  5. J. L. J. Rosenfold, D. C. Strachan, P. S. Tromans and P. A. Searson, "Experiments on the incendivity of radio-frequency, breakflash discharges (1.8-21 MHz c. w.)", The Radio and Electronic Engineer, Vol. 51, No. 4, pp. 175-186, 1981. https://doi.org/10.1049/ree.1981.0023
  6. D. J. Burstow, R. J. Leveland, R. Tomlinson and D. W. Widginton, "Radio frequency ignition hazards", The Radio and Electronic Engineer, Vol. 51, No. 4, pp. 151-169, 1981. https://doi.org/10.1049/ree.1981.0021
  7. 田中隆二, 本質安全防爆電氣回路に關する基礎的硏究, 勞働省産業安全硏究所, 1970.
  8. T. Motoyama, "Ignition Hazards of Hydrogen-Air Mixture Caused by Spark Discharge with switching in Radio Frequency Resistative Circuit", Research Report of the Research Institute of Industrial Safety, RIISRR-92, 1993.
  9. 산업안전연구원, 고주파 전기회로에 의한 가연성 가스의 점화 위험성 분석 및 방지 대책에 관한 연구, 연구보고서 기전연 95-6-7, 1995.
  10. 최상원, 이관형, 문정기, "고주파 스파크에 의한 가연성 혼합가스의 점화위험성에 관한 연구", '96 대한전기학회 하계학술개회 논문집, pp. 1913-1916, 1996.
  11. 최상원, 이관형, 강재수, 최창규, 문정기, "고주파 전기회로의 개폐불꽃에 의한 혼합기체의 점화위험성", '95 한국산업안전학회 추계학술논문발표회논문초록집, pp. 3-6-3-13, 1995.