SUB-LAYER EXTINGUISHING OF ALCOHOLS BY BINARY MIXTURES OF FIRE-EXTINGUISHING AEROSOL AND CO2

Abstract

Introduction. Now the number of enterprises and technological processes where alcohols and alcohol-containing liquids are used is constantly increasing. Due to the content of carbon, hydrogen and oxygen in the molecule, alcohols have increased flammable properties, namely: high combustion temperature, low lower concentration limit of flame propagation, high evapo-ration rate due to low boiling point and significant explosion pressure. Thus, in order to increase the fire safety of alcohol enterprises, is relevant the search for fire extinguishers that would provide both surface extinguishing and volumetric phlegma-tization of alcohol-air mixtures . The purpose and objectives of the study. The aim of the work is to determine the fire extinguishing factors and the efficiency of sublayer extinguishing by binary mixtures of fire extinguishing aerosol and CO2.Research objectives To establish fire-extinguishing factors of sublayer extinguishing of alcohols by binary mixtures of fire-extinguishing aerosol and CO2. To determine the fire-extinguishing efficiency of sublayer extinguishing of alcohols by binary mixtures of fire-extinguishing aero-sol and CO2. Methods. In the work according to the developed method with the use of metrologically certified equipment and certified measuring instruments, the fire-extinguishing minimum volume concentration of the components of the binary gas-aerosol mixture on the developed installation was determined. 6 Пожежна безпека, №36, 2020 Results. It was found that the maximum fire-extinguishing intensity of the aerosol formed from aerosol based compound based on sucrose (33%), potassium nitrate KNO3 (67%), is about 6 g / s in the experimental setup. The fire-extinguishing inten-sities of aerosol supply and its binary mixture with CO2 have been experimentally established. It was found that the addition of CO2 to the aerosol reduces the time of emergence of gas aerosol bubbles and quenching to 1.5 times. It was found that the size of the bubbles when adding CO2 is 10 -35% larger than when using CO2 itself. Conclusions. The results of the research showed that binary gas-aerosol mixtures have high fire-extinguishing efficiency with their sublayer supply for extinguishing alcohols and are several times more efficient, cheaper and have several times longer service life compared to traditional fire extinguishers.