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V. Makarenko, A. Kireev, E. Slepuzhnikov, M. Chirkina. Investigation of the effects of powders on fire extinguishing characteristics of binary layers of porous materials. P. 297-310.

 

 

Investigation of the effects of powders on fire extinguishing characteristics of binary layers of porous materials

 

Viktoriya Makarenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-5629-1159

 

Oleksandr Kireev

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-8819-3999

 

Evgen Slepuzhnikov

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-5449-3512

 

Maryna Chyrkina

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-2060-9142

 

DOI: https://doi.org/10.52363/2524-0226-2022-35-22

 

Keywords: flammable liquids, binary fire extinguishing system, perlite, vermiculite, foam glass, dispersed powders, crystal hydrates

 

Аnnotation

The influence of dispersed powders on quenching of flammable liquids by means of use of binary layers of light porous materials is investigated. The choice of granular foam glass as a material of the lower layer of the binary system is substantiated. Exfoliated perlite and vermiculite were chosen for the upper layer, which exhibits increased insulating properties. It is proposed to apply powders on the upper layer of the binary fire extinguishing system: sand, ground talc, hollow glass microspheres. The use of the following low-melting powders of crystal hydrates of medium degree of dispersion was also investigated: aluminum sulfate, sodium acetate, sodium hydrogen phosphate, sodium potassium acid, zinc sulfate and sodium thiosulfate. This reduces the volume of the cavities of this layer, which will increase the insulating properties of the fire extinguishing system. For the selected materials of the fire extinguishing system are defined: bulk density, buoyancy, moisture retention and ability to fill the cavities of the layer of material below. The highest buoyancy and the lowest bulk density of the binary fire extinguishing system is provided by the use of crushed foam glass as the bottom layer. The use of expanded perlite with a granule size of 1,2±0,2 mm and lamellar vermiculite with a plate size of 2×2,5 and 2×5 mm ensures the highest moisture content and the lowest ability to spill powders through the upper layer of the fire extinguishing system. Based on the study of the effect of fine powders of low-melting crystal hydrates on the fire-extinguishing characteristics of binary layers of light porous materials, it was found that the best results provide the use of crystal hydrates of sodium acetate (1,5 kg/m2), sodium hydrogen phosphate (0,12 kg/m2) and zinc sulfate (1,3 kg/m2). Of the latter, sodium hydrogen phosphate crystal hydrate is the most effective.

 

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