Abstract
To solve the problem of effective retardation, researchers propose to use mostly gases, powders and their mixtures, as well as, in some cases, khladons and their mixtures with gases. Given the characteristics of known agents of volumetric fire-extinguishing, they share common shortcomings: devices are rather sizeable, gas storage requires a significant number of cylinders, powders need rather big containers, in which they tend to clod. In addition, it takes too long to supply the above-mentioned substances compared with the velocity of explosion front propagation. Determining an influence of the addition of gas-aerosol mixtures on the velocity of flame propagation throughout stoichiometric n-heptane-air mixture will make it possible to define effective concentrations and ratios of fire-extinguishing aerosol and gases СО 2 and N 2 on the velocity of flame propagation throughout a combustible homogeneous mixture, which will guide towards a more efficient use of gas-aerosol mixtures in order to prevent explosions and fires. Present research shows high effectiveness of influence of the addition of a binary mixture of fire-extinguishing aerosol and gases СО 2 and N 2 on a decrease in velocity of flame of the homogeneous heptane-air mixture. It was experimentally found that the influence of binary mixtures on the stoichiometric n-heptane-air mixture decreases the flame propagation velocity by up to 6.5 times, compared with the original velocity of flame propagation throughout the stoichiometric mixture. Thus, even small addition of binary gas-aerosol mixtures to the homogeneous combustible systems decreases explosion power and prevents the occurrence of detonation in them. Fire-extinguishing concentrations of aerosol and gases in this case decreases considerably due to synergy between them. Determining the effect of binary gas-air mixtures on the velocity of flame propagation throughout homogeneous combustible mixtures allows us to define conditions for effective anti-explosive and fire-retardant protection of sites with the presence of flammable, combustible and explosive media and substances.
Highlights
Modern means of volumetric fire suppression, as it is known, do not always provide adequate fire extinguishing efficiency and retardation
It was established experimentally that the influence of binary gas-aerosol mixtures on the stoichiometric n-heptane-air mixture decreases flame propagation velocity by up to 6.5 times compared with the original flame propagation velocity
We found dependence of velocity of flame propagation throughout stoichiometric n-heptane-air mixture on concentrations and ratios of components of binary mixtures – aerosol and CO2 or N2, which is in the fact that within a range of aerosol concentrations from 8 g/m3 to 2.2 g/m3 and of СО2 gas from 16 % to 8.2 %, there occurs a maximum decrease in flame propagation velocity
Summary
Modern means of volumetric fire suppression, as it is known, do not always provide adequate fire extinguishing efficiency and retardation. The specified mixture will possess high fire extinguishing capacity, will be environmentally clean, quite cheap and have the capability to effectively suppress explosions or decrease the scale of consequences due to a decrease in the velocity of propagation of the explosive flame front. At present, there is a lack of effective extinguishing agents, which would provide protection against explosions and fires for sites of chemical, light, petrochemical, nuclear, and machine-building industry. In these industries, there are sites with considerable volumes of circulation and storage of flammable, combustible and explosive substances, which in case of explosion or fire lead to catastrophic consequences. The possibility of initiation and lengthy existence of such fires emphasizes the relevance of the specified topic of research
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