The fire extinguishing mechanism of foam extinguishing agent is mainly cooling and suffocating, i. e., forming a continuous foam layer on the burning surface, cooling the burning surface through the foam itself and the mixture of precipitation, and extinguishing the burning material from the oxygen through the covering effect of the foam layer.
as follows: (1) The foam covering layer formed on the surface of the burning material can isolate the surface of the burner from the air. (2) The foam layer closes the burning surface, can cover the flame to the burning matter heat radiation, prevents the combustion of evaporation or pyrolysis volatilization, so that combustible gas is difficult to enter the combustion zone. (3) The foam precipitated liquid has a cooling effect on the surface. (4) The water vapor produced by the foam heated evaporation has the effect of diluting the oxygen concentration in the combustion zone. Application: Foam extinguishing agent is mainly suitable for extinguishing non-water-soluble combustible, flammable liquid fires and general solid material fires (such as fires from tanks to fire or leaking from a rotating machine), as well as warehouses, hangar, basements, underground tunnels, mines, ships and other limited spaces of fire. Liquefied natural gas, such as deep cold liquid storage tanks leakage, can also apply a high-number foam, to prevent evaporation and ignition of the role.
