Optimization of the Сomposition of Solutions of the Aqueous Medium in the Metastable Phase State for Extinguishing Fires


Annotation:

Among the means of volumetric fire extinguishing, one of the most efficient agents is an aqueous medium in a metastable phase state, consisting of vapor and drop phases. Previously, the possibility of increasing its fire extinguishing efficiency by introducing surfactants and inhibitors separately was confirmed experimentally and theoretically. For a theoretical study of the possibility of achieving a double effect with their combined use, a model was created that allows to evaluate the contribution of each component of the inhibitory agent to the quenching process when the inhibitor and surfactants are used together. It is established that at a certain value of the foam supply rate, the inhibitory composition will not have a fire extinguishing effect, and vice versa, when a certain concentration of the inhibitory composition is reached, the fire will be extinguished without the participation of foam. The dependence of the time of extinguishing fires of spills of flammable liquids on the consumption of the inhibitory substance and the efficient consumption of foam was determined. Analysis of this dependence shows that time is a function of two arguments — the consumption of the inhibitory composition and the consumption of surfactants, which can be represented graphically in the form of a 3D model. It is concluded that the required inhibitor concentration in such solutions can be determined graphically. Theoretical calculations show that the maximum efficiency in extinguishing a fire with a flammable liquid with an aqueous medium in a metastable phase state containing a fluorosynthetic foaming agent and an inhibitory salt can be achieved when the inhibitor content in the solution is 0.4 of its fire extinguishing concentration. An aqueous medium in a metastable phase state, containing a fluorosynthetic foaming agent and an inhibitory salt, has a double effect when extinguishing flammable liquid fires. Foam, covering the surface, reduces the volume of the combustion zone, and the inhibitor reduces the rate of chemical reactions in it.

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DOI: 10.24000/0409-2961-2022-10-15-20
Year: 2022
Issue num: October
Keywords : modeling fluorosynthetic foaming agents flame retardants volumetric fire extinguishing closed spaces water environment metastable phase state
Authors:
  • Khalikov R.V.
    Khalikov R.V.
    Lecturer, vokilah@rambler.ru, Academy of GPS of the Ministry of Emergency Situations of Russia, Moscow, Russia
  • Roenko V.V.
    Roenko V.V.
    Cand. Sci. (Eng.), Prof. Academy of GPS of the Ministry of Emergency Situations of Russia, Moscow, Russia
  • Begishev I.R.
    Begishev I.R.
    Dr. Sci. (Eng.), Prof. Academy of GPS of the Ministry of Emergency Situations of Russia, Moscow, Russia
  • Dvoenko O.V.
    Dvoenko O.V.
    Cand. Sci. (Eng.), Assoc. Prof. Academy of GPS of the Ministry of Emergency Situations of Russia, Moscow, Russia