Dubinin D. Study of requirements for prospective means of fire extinguishing with fine sprayed water. P. 15-29.

Study of requirements for prospective means of fire extinguishing with fine sprayed water

 

Dmytro Dubinin

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0001-8948-5240

 

DOI: https://doi.org/10.52363/2524-0226-2021-33-2

 

Keywords: finely divided water, fire, fire extinguishing, dispersion, supply intensity, fire extinguishing means

 

Abstract

Studies have been conducted on the use of finely sprayed water for firefighting. It is established that finely sprayed water in foreign sources is treated according to the percentage distribution of small and large water droplets, and in domestic only the dispersion of water droplets is indicated, and the percentage distribution is not given. The possibility of its application for extinguishing almost all substances and materials, including pyrophoric, except for substances that react with water with the release of thermal energy and combustible gases (high efficiency in extinguishing fires of classes A, B, C, F and live electrical installations) ). Criteria of efficiency of application of means of fire extinguishing by finely sprayed water are established thus the main criterion is the size of water drops (dispersion), the second intensity of giving of finely sprayed water, and the third addition of additives for the purpose of increase of fire extinguishing efficiency. It is established that the criteria for the effectiveness of finely sprayed water for firefighting will depend primarily on the technical means of firefighting. The technical and economic indicators of modern technical means of foreign manufacturers are determined, which include the principle of operation due to the increased pressure in the system, pump performance, volume (stock) of extinguishing agent, total weight of the mobile installation and cost. The efficiency of extinguishing fires with finely sprayed water, which is due to the increased cooling effect due to the high specific surface of the droplets, uniform distribution of water droplets in the combustion zone, reducing the concentration of oxygen and dilution of combustible vapors and gases in the combustion zone by water vapor. Based on this, the effect of the dispersion of finely divided water during its supply to the fire is calculated, as a result of which it is established that the extraction of heat from the fire will be carried out by heating water droplets to boiling point, heat consumption for steam and heat consumption for steam heating. water to ambient temperature in case of fire.

 

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