Efficiency of fire extinguishing with general purpose fire extinguishing powder in case of non-stationary interaction of its particles with burning material
https://doi.org/10.29235/1561-8358-2020-65-4-476-486
Abstract
Evaluation of the effectiveness of fire extinguishing by jet systems of powder fire extinguishing in conditions of non-stationary heat exchange processes and heterogeneous inhibition of active flame centers by powder particles was the aim of the work. The theoretical dependence of the amount of heat, absorbed by the particles of fire extinguishing powder, and the reaction rate of heterogeneous active centers of flame, inhibiting them, in non-stationary conditions of heat transfer, as well as inhibition reaction for fire extinguishing ink jet systems were obtained. The extinguishing of a flame with a fire extinguishing powder under non-stationary conditions is more effective, the smaller is the effective size of the powder particles, the longer is their stay in the combustion zone, and the shorter are the characteristic times of heat transfer and inhibition reaction. Comparison of the estimates of the characteristic duration of heat transfer and inhibition reaction for widely used fire extinguishing powders has shown a large inertia of the thermal mechanism of fire extinguishing, which greatly reduces its effectiveness at high speeds of powder particles in the combustion zone.
About the Author
A. I. Kitsak
Research Institute of Fire Safety and Emergency Situations of the Ministry of Emergency Situations of the Republic of Belarus
Belarus
Belarus
Аnatoli I. Kitsak – Ph. D. (Physic and Mathematic), Leading Researcher of the Research Department of Automatic Means of Detection and Elimination of Emergencies
183а, Soltys Str., 220046, Minsk
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