SU1687266A1 - Method of extinguishing burning liquids - Google Patents

Abstract

The invention relates to fire extinguishing, in particular to extinguishing flammable liquids stored in tanks, and allows for an increase in the efficiency of extinguishing. Solid carbon dioxide, in crushed form, is supplied under a layer of combustible liquid in compact portions, the diameter of which is 3-4 cm 2 silt.

Description

FIELD: firefighting, in particular, extinguishing of flammable liquids stored in tanks.

The aim of the invention is to increase the efficiency of extinguishing burning liquids, reducing the consumption of carbon dioxide and the costs of the extinguishing process.

FIG. 1, 2 shows the steaming steps.

Solid carbon dioxide (dry ice), the specific weight of which is greater than the specific weight of the burning liquid or the specific weight of the available bottom water, is in a fragmented form introduced into the mass of the burning liquid in the local region (Fig. 1). Due to the intense heat exchange between the liquid and carbon dioxide, the latter is rapidly sublimated into the gaseous phase. The rate of mass loss of dry ice in water, compared with the mass loss in air, increases by about 600 times. Formed with gaseous carbon dioxide in the form of bubbles rises to the surface of the liquid, carrying along its underlying cold and cooling water.

the process of sublimation of dry ice portions that actively cool down the heated first layer of burning liquid. Cooling the upper layer of liquid leads to a decrease in the rate of vaporization and to a decrease in the burning activity. The carbon dioxide escaping to the surface of the liquid stops burning in the local area by inhibiting the vapors of the combustible liquid (Fig. 2, pos. 1). Changing with aeration, the situation above the carbon dioxide gas outlet contributes to ejection of its layer to the combustion zone, where in a thin layer, partly due to the inhibition of liquid vapor, partly due to a decrease in the oxygen concentration of air entering the combustion zone, the exothermic reaction stops. This effect, in turn, reduces heat radiation towards the site where combustion has been eliminated (Fig. 2. Pos. 2), thereby facilitating the movement of the boundary of the combustion zone away from the input area under the layer of carbon dioxide liquid. Thus, the presence of convective

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The free mirror of the burning bone id column provides self-localization of the burning due to the crust and oxygen zone of the junky layer of the inhibiting gaseous carbon dioxide sublimated at the mixing of the Dry fluid by the burning liquid. The effect of the extinguished quenching effect. which the proposed method is based on, ensuring the elimination of combustion using the minimum amount of carbon dioxide and the cost of implementing the method compared with the prototype

In the experiments / experiments recorded a linear velocity of propagation of the front

This elimination of combustion is at least 40 cm / s, whereas when quenching with foams, this value is approximately 20 cm / s.

Claims (1)

Invention Formula A method of extinguishing burning liquids, which consists in supplying solid carbon dioxide dioxide to the fire site, characterized in that, in order to increase the effect of extinguishing, carbon dioxide is supplied in a crushed vice with a granule diameter of 3-4 cm under a layer of burning liquid compact. in small portions. YAGGGT 7G77U TP G T1-T77G7TGTT TT7})) Y} T / b Pi g / (V Fig psi