Investigation of complex inhibiting compositions for volumetric fire extinguishing with aqueous media

Introduction. One of the main problems of modern volumetric fire extinguishing with aqueous media is the use of agents having a single extinguishing mechanism. Introduction of water-soluble inhibitors into aqueous media is the most effective way to increase their extinguishing ability. However, at the moment there are no theoretical and experimental studies to establish the increase of fire extinguishing efficiency of aqueous media with the introduction of two or more inhibitors.

Purpose. To study the effect of introduction of two and more water-soluble inhibitors on the fire-extinguishing efficiency of aqueous media.

Materials and methods. The method of analysis and synthesis was applied for the selection of complex inhibitory compositions. The method of validation of mathematical models was applied to check the adequacy of the compiled model. The theory of mathematical analysis was used to determine the effective concentration of complex inhibitors. The evaluation of the effectiveness of the introduction of complex inhibitor composition was carried out by mathematical modelling in FDS environment.

Theoretical bases. The choice of complex inhibitory composition was carried out in accordance with the theory of branched chain combustion processes.

Results and discussions. A mathematical model of combustion suppression in a closed volume by complex water-soluble inhibitors has been developed. Successful validation of this model on the basis of available experi­mental data has been carried out. Mathematical modelling of combustion suppression by aqueous solutions of: ammonium sulphate and magnesium chloride, potassium carbonate and potassium acetate was carried out.

Conclusions. It has been established by the conducted studies that the effective mass concentration of the complex inhibitor of ammonium sulphate and magnesium chloride in aqueous solution corresponds to the value of 3.4 %, which is more than 4 times less than the effective concentration of each of the substances taken separately. The two-component inhibitor of potassium carbonate and potassium acetate are mutually suppressive and do not lead to suppression of combustion by chemical inhibition. Decrease of suppression time with increasing concentration of potassium carbonate and potassium acetate occurs due to increase of carbon dioxide release, as a result of thermal decomposition of these inhibitors.

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