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Chemical scavenging activity of gaseous suppressants by using laser-induced fluorescence measurements of hydroxyl
Halons such as CF3Br (Halon 1301) are currently being used worldwide for fire protection. However, the production of halons has been banned in developed countries under the Montreal Protocol because of the destructive effect of these compounds on the stratospheric ozone layer. This has intensified the search for new fire suppressants. The potential alternatives to halons are required to be environmentally friendly but at the same time they must not sacrifice suppression capability. Studied are the suppressant effectiveness of five different gaseous agents: N2, CO2, SO2, CF3Cl, and CF3Br. Laser-induced fluorescence is used to determine quantitative hydroxyl concentration profiles in opposed CH4/N2-air diffusion flames with and without suppressants. Measurements are made by using a nitrogen-diluted counter-flow flame with 1 % inhibitor added to the air stream. Visual extinction limits are also determined for each suppressant to determine the percent inhibitor in the air stream required for flame extinction. The suppression capabilities of all five agents are compared based on relating laser-induced fluorescence measurements of OH concentration to the visual extinction limits. An inverse correlation is found between the percent reduction in total integrated OH number density and the visual extinction limit. This correlation provides an effective protocol that can thus be used for studying and comparing different fire suppressants.
Chemical scavenging activity of gaseous suppressants by using laser-induced fluorescence measurements of hydroxyl
Halons such as CF3Br (Halon 1301) are currently being used worldwide for fire protection. However, the production of halons has been banned in developed countries under the Montreal Protocol because of the destructive effect of these compounds on the stratospheric ozone layer. This has intensified the search for new fire suppressants. The potential alternatives to halons are required to be environmentally friendly but at the same time they must not sacrifice suppression capability. Studied are the suppressant effectiveness of five different gaseous agents: N2, CO2, SO2, CF3Cl, and CF3Br. Laser-induced fluorescence is used to determine quantitative hydroxyl concentration profiles in opposed CH4/N2-air diffusion flames with and without suppressants. Measurements are made by using a nitrogen-diluted counter-flow flame with 1 % inhibitor added to the air stream. Visual extinction limits are also determined for each suppressant to determine the percent inhibitor in the air stream required for flame extinction. The suppression capabilities of all five agents are compared based on relating laser-induced fluorescence measurements of OH concentration to the visual extinction limits. An inverse correlation is found between the percent reduction in total integrated OH number density and the visual extinction limit. This correlation provides an effective protocol that can thus be used for studying and comparing different fire suppressants.
Chemical scavenging activity of gaseous suppressants by using laser-induced fluorescence measurements of hydroxyl
Chemische Aktivität von gasförmigen Löschmitteln unter Verwendung von laserinduzierten Fluoreszenzmessungen der Hydroxylradikale
Vora, N. (author) / Siow, J.E. (author) / Laurendeau, N.M. (author)
Combustion and Flame ; 126 ; 1393-1401
2001
9 Seiten, 4 Bilder, 2 Tabellen, 17 Quellen
Article (Journal)
English
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