Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지

Extinguishment of n-heptane Pool Fire by Water Mist Containing Alkali Metal Agent

알칼리 금속염을 함유한 미분무수의 헵탄 Pool Fire 소화

  • Park, Jae-Man (Department of Safety Engineering, Chungbuk National University) ;
  • Shin, Chang-Sub (Department of Safety Engineering, Chungbuk National University)
  • Published : 2005.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

An experimental study is performed for extinguishing of n-heptane pool fire by water mist containing potassium acetate as a fire suppression additive. Water mist was generated by a single pressure nozzle in a small-scale chamber. The drop size distribution of water mist was measured using laser diffraction(Malvern particle sizer). The flame temperature, oxygen concentration and carbon monoxide concentration were measured. In case of using additives, the fire extinguishing time was shorter than that of pure water at a given discharge pressure and it was because the momentum of a water droplet containing additives was increased. And also dissociated metal atoms, potassium, were reacted as a scavenger of the major radical species OH, H which were generated for combustion process. Moreover, at a high pressure of 4MPa, the fire was extinguished through blowing effect as well as primary extinguishing mechanisms.

Keywords

References

  1. United Nation Environmental Program(UNEP), 'Montreal Protocol on Substances that Deplete the Ozone Layer', 1987
  2. NFPA 750 : Standard on Water Mist Fire Protection Systems. National Fire Protection Association, 2003
  3. Z. Jiang, W.K. Chow, J. Tang, S.F. Li, 'Preliminary study on the suppression chemistry of water mists on poly(methyl methacrylate) flames', Polymer Degradation and Stability, Vol. 86, Issue 2, pp. 293-300, 2004 https://doi.org/10.1016/j.polymdegradstab.2004.03.024
  4. H.K. Chelliah, A.K. Lazzarini, P.C. Wanigarathne, G.T. Linteris, 'Inhibition of premixed and nonpremixed flames with fine droplets of water and solutions', Proceedings of the Combustion Institute, Vol. 29, pp. 369-376, 2002 https://doi.org/10.1016/S1540-7489(02)80049-9
  5. A.E. Finnerty, R.L. McGill, W.A. Slack, 'Waterbased halon replacement sprays', ART-TR-1138, U.S. Army Research Lab., 1996
  6. B. Downie, C. Polymeropoulos, G. Gogos, 'Interaction of a water mist with a buoyant methane diffusion flame', Fire Safety Journal, Vol. 24, pp. 359 -381, 1995 https://doi.org/10.1016/0379-7112(95)00029-1
  7. B.A. Williams, J.W. Fleming, 'Suppression mechanisms of alkali metal compounds', Halon Options Technical Working Conference, pp. 157-169, 1999
  8. M.B. Kim, Y.J. Jang, M.O. Yoon, 'Extinction limit of a pool fire with a water mist', Fire Safety Journal, Vol. 28, pp. 295-306, 1997 https://doi.org/10.1016/S0379-7112(97)00011-8
  9. B. Yao, W. Fan, G. Liao, 'Interaction of water mists with a diffusion flame in a confined space', Fire Safety Journal, Vol. 33, pp. 129-139, 1999 https://doi.org/10.1016/S0379-7112(99)00020-X
  10. J. Richard, J. P. Garo, J. M. Souil, J. P Vantelon, V. G. Knorre, 'Chemical and physical effects of water vapor addition on diffusion flames', Fire Safety Journal, Vol. 38, pp. 569-587, 2003 https://doi.org/10.1016/S0379-7112(03)00012-2
  11. A.K. Kim, 'Improvement of water mist performance with foam additives', Proceedings of Fire Suppression and Detection Research Application Symposium, pp. 439-447, 2001
  12. M.D. King, J.C. Yang, W.S. Chien, W.L. Grosshandler, 'Evaporation of a small water droplet containing an additive', Proc. of the ASME National Heat Transfer Conference, Baltimore, 1997