PHLEGMATIZING CONSENTRATIONS OF GAS FIRE EXTINGUISHING COMPOUNDS

The current article introduces conditional division of fire extinguishing compounds into inerting gases and reactive inhibitors. It considers the action mechanism of reactive inhibitors while being used in order to turn off hydrocarbons. It provides the examples of fire extinguishing halohydrocarbon compounds that do not have a negative effect onto the ozone layer of the Earth and provides their fire extinguishing concentrations. It shows that the fire extinguishing mechanism of reactive inhibitors is determined by the chemical structure of their molecules which contain, as a rule, several heterogeneous atoms including halogen ones — atoms of bromine, fluorine, chlorine, iodine and one or two atoms of carbon (presence of hydrogen atoms is possible). The author of the article describes a transformation chain while obtaining freon with a various fractional substitutionality of hydrogen atoms in molecules of methane and ethane. He demonstrates that dealing with reactive inhibitors one should take into account the absorption of the heat evolving during burning as well as in the process of molecular decomposition of inhibitors. In his article the author also describes the main ways of temperature reduction in a burning zone. It is shown that the temperature of combustible mixture will decrease to the extinction temperature regardless of the action mechanism of phlegmatizing gas fire extinguishers. There is derived a general formula of phlegmatizing concentration of a phlegmatizer. In the article, there also given examples of calculation of phlegmatizing concentrations of gas mixtures if steam-and-gas mixtures of inerting gases are used for fire extinguishing.