Optimization of the Dry Chemical Powders’ Composition for Class D1 Fires Extinguishing

Abstract

During the researches, carried out in the article, sodium chloride recommended itself as the best fire-extinguishing substance. In order to give it the properties of a fire extinguishing powder, two more components were added to it, namely ground slag and aerosil. These components were chosen according to their physical and chemical properties. As evidenced by the corresponding quenching parameters, the optimal composition of the fire extinguishing powder was established on the basis of performed experiments and obtained dependences. The properties of the fire extinguishing powder were improved by adding ground slag and aerosil. These additives increase the heat resistance, insulating and anti-caking ability, fluidity and fire-extinguishing efficiency of the powder. The best results were obtained after using the extinguishing powder of such composition: sodium chloride - 73.5%, ground slag - 25%, aerosil - 1.5%. Experimental-empirical dependence for determination the extinguishing intensity according to the extinguishing parameters and the fire-extinguishing composition was developed.