FEATURES OF MAGNESIUM FLAME EXTINGUISHING WITH DRY MIXTURES

Abstract

An analysis of fires and explosions at ammunition storage facilities was conducted, and it was established that the ignition of wooden containers by flammable substances can lead to a man-made disaster. It was also established that the use of effective fire extinguishing mixtures is insufficient and requires further development. Determining the effectiveness of protection against high temperatures and the effects of components in the composition, and the role in extinguishing high-temperature flames, makes it possible to develop effective methods and means of extinguishing fires of such classes. To counteract high temperatures, a mixture composition was proposed, based on flame retardants (ammonium polyphosphate), gas generators (melamine), carbohydrates (pentaerythritol), and high-temperature fillers based on mineral substances. Studies have shown that when extinguishing magnesium flames with dry mixtures containing aluminosilicate microspheres, perlite, basalt flakes, metallurgical slag, and ash in an amount of 50 %, the intensity of powder delivery when extinguishing magnesium flames was within the range of 0.034…0.041 g/(cm2·s), which is significantly lower than the intensity of sodium chloride delivery. The results of determining the effectiveness of extinguishing magnesium flames with dry mixtures indicate an ambiguous effect of fillers on changes in the intensity of powder supply during flame extinguishing.