• Title/Summary/Keyword: Mixed fire extinguishing agent

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Flame Extinguishing Concentrations of Mixed Gaseous Agents (가스계 혼합소화약제의 불꽃소화농도)

  • 김재덕;임종성;이윤우;이윤용
    • Fire Science and Engineering
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    • v.15 no.1
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    • pp.34-40
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    • 2001
  • Fire extinguishing efficiency of mixed gaseous agents were investigated by the cup-burner test and predicting by the model of flame extinguishing concentration. The binary mixed agents that tested were carbon dioxide/HFC-23, carbon dioxide/HCFC-22, carbon dioxide/HFC-227ea, carbon dioxide/HFC-125, carbon dioxide/FIC-13I1, Hexafluoropropylene/HFC-23 and ternary mixed agents were carbon dioxide/HFC-23/HFC-l34a, carbon dioxide/HFC-23/HFC-227ea, carbon dioxide/HFC-23/HFC-125. A model which contains the flame extinguishing concentration and composition of pure components predicted the flame extinguishing concentration of mixture well. This model was superior when each component of the mixture exhibit physical fire extinguishing performance.

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Experimental Study on the Fire Extinguishing Characteristics of Water Mist System (미분무수 소화설비의 소화특성 실험)

  • Hwang, Won-Jun;Kim, Hwang-Jin;Oh, Kyu-Hyung;Lee, Sung-Eun
    • Fire Science and Engineering
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    • v.23 no.2
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    • pp.78-84
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    • 2009
  • We carried out fire extinguishing experiments with three kinds of water mist nozzle system. Fire extinguishing experiment according to installed nozzle height and fuel pan location was done. And fire extinguishing performance was compared with plain water and foam agent mixed solution. Water mist nozzle height was varied with 4m, 3.5m and 3m and position of fuel fan was varied 0.5m and 1m from the center of water mist nozzle. Foam agent that used in this experiment is 3% type of AFFF (Aqueous Film Forming Foam) solution. Experimental result showed the door opening effect was little. Fire extinguishing performance of foam agent mixture water mist was better than the plain water mist only.

Flame Extinguishing Concentrations and Flue Gas Compositions of n-Heptane by Mixed Inert Gas Agents (불활성 가스계 혼합소화약제의 n-Heptane 불꽃소화농도 및 배가스 조성)

  • 김재덕;김영래;홍승태;이성철
    • Fire Science and Engineering
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    • v.16 no.3
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    • pp.77-83
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    • 2002
  • We measured flame extinguishing concentration and flue gas composition in the n-heptane fuel cup-burner system using inert gas agents such as nitrogen, argon, carbon dioxide and their mixtures. The flame extinguishing concentration of binary gaseous mixture was well predicted by model which contains the flame extinguishing concentration and composition of pure components. The higher average specific gravity of the mixed inert gas agents, the more excellent flame extinguishing performance. And the structure of enclosed space also affects the fire extinguishing. The composition of carbon dioxide in the flue gas was decreased with increasing extinguishing agent used. Nitrogen monoxide production is not related with increasing nitrogen, but increased at rapid mass flow rate of air in the cup-burner.