SU722545A1 - Fire extinguishing powder - Google Patents

Description

The invention relates to the inhibition of the ignition and combustion of a gas mixture and can be used to prevent and extinguish fires and explosions in various devices where acetylene is used. It is known to use in the practice of fire powder powders based on chlorides, phosphates, sulphates and other inorganic salts. Cl It is also known to use a dry powdered agent consisting of monoammonium phosphate, spraying agent (talc, mica, etc.), waterproof and water-absorbing agents ( metal soaps calcium phosphate, etc.) 2. The disadvantage of these inhibiting compounds is low efficiency in extinguishing gas combustible gas. The closest to the present invention is a fire extinguishing powder containing monoammonium phosphate, diammonium phosphate, ammonium sulfate and small amounts of substances that absorb moisture and reduce the hygroscopicity of the powder, weight. %: Monoammonium Phosphate-70 Diammonium Phosphate 15-45 Ammonium Sulfate 5-35 Tricalcium Phosphate 2-3 Magnesium Stearate 1.5-2 PVC vinyl 5-6 (However, the powder of this composition is not sufficiently effective in extinguishing the flame of acetylene with air. The aim of the invention is to increase the efficiency of flame extinguishing acetylene-air mixtures. The goal is achieved by the addition of phosphorus alcohol ammonium and talcum powder in the following ratio of components,% by volume: Monoammonium phosphate40-45 Diammonium phosphate 30-3

Phosphoropolum ammonium t 15-2O

Talc2-5

Potassium stearate 2-3

Full vinyl chloride resin1-2

The powder is prepared as follows. Example 1. The components of the composition are dried in an oven at IO-12O C, then mechanically mixed in the following ratio:

gob %

Monoammonium phosphate20O 40 Diammonium phosphate17535

Ammonium phosphorus phosphate 7515

Talc255

Potassium stearate 153

PVC Plastic Resin102

After mixing, the powder is ground to obtain a fraction with a particle size of .60-160 microns.

Example 2 The powder is prepared as in Example 1 ,. the components are mixed in the following ratio:

g vol.% Monoammonium phosphate225 45 Diammonium phosphate15O 30

Phosphorus

ammonium phramate 100 2 O

Talc102

Potassium stearate 102

PVC resin51

The powder is ground to obtain a fraction with a particle size of 60-160 microns.

Example 3. Powder components are prepared analogously to example 1 and mechanically mixed in the following ratio;

r about %

Monoammonium phosphate21O 42

Diamonium phosphate165 33 Distance, Mass of additive, g / l

Known inhibitor

20 20

O, O1 O, O5

Foz4yurovolfram 1T

lmmoni 85 17

Talc153

Potassium stearate 153

Polyvinyl chloride

resin102

The powder is ground to obtain a fraction with a particle size of 60-160 µm.

The powder obtained in this way is tested to extinguish the flame of a mixture of 9% acetylene with air in a laboratory installation, which allows one to obtain a photographic recording of the combustion process of explosive mixtures.

The pre-mixed mixture of acetylene and air with the proposed or known fire-retardant powder enters the explosion cylinder and then is discharged through the diluent and powder trap to the atmosphere. At the same time, a non-inhibited mixture of acetylene with air of the same composition is fed to the burner and the flame is ignited. At a certain moment, the explosive cylinder replaces a portion of the pipeline feeding the burner flame, and the flame slips into the burner and ignites the mixture in the cylinder,

In the case of a non-inhibited mixture, the plate propagates to the end of the cylinder, as evidenced by signals from photodiodes located at equal distances from each other to x ol of the explosion chamber.

The introduction of inhibitory powders into the combustible mixture reduces the rate of flame propagation, and for the most effective inhibitors, complete combustion of the combustion process is achieved. The flame ignites the mixture in the cylinder, which is signaled by the first photodiode, but the resulting focus does not propagate further (there are no signals from subsequent photodiodes)

The table presents the results of a study of the effectiveness of the proposed and known extinguishing powder on the process of flame propagation of an acetylene-air mixture.

I

The proposed inhibitor

10 Does not spread the flame passed through the flap of a mixture of acetylene with air, cm

Sales Tables

Claims (3)

It can be seen from the table that the effectiveness of the effect of inhibitory powders is determined by their amount in the mixture. With an increase in the amount of the known powder from O, O1 to 0.2 O g / l, the distance over which the flame propagates decreases. Fire extinguishing is achieved with the introduction of 0.25 g / l. The introduction of 0.01 g / l of the proposed powder leads to attenuation of the flame approximately in the middle of the explosive cylinder. With an increase in the amount of powder to O, O5 g / l, the flame in such a combustible mixture does not spread. Thus, the conducted comparative analysis shows that the effectiveness of the effect of the proposed fire powder is 5 times higher than that of the known powder, since the proposed powder is 5 times required to extinguish acetylene-air mixtures. less than known. Claims Fire-extinguishing powder containing monoammonium phosphate, diammonium phosphate, stearate and polyvinyl chloride resin, characterized in that, in order to increase the efficiency of extinguishing the flame of acetylene-air mixtures, phosphorofluorphramate and talc are added to it to extinguish the flame of acetylene-air mixtures; %: 4О-45 Monoammonium phosphate t 30-35 Diammonium phosphate Phosphorovol4ramat 15-20 ammonium 2-5 Talc Stearate potassium 2-3 Polyvinyl chloride resin Information sources taken into account during the examination 1. Fire extinguishing agents, VNIIPO, M., 197O. 2. The patent of England No. 1О76782, cl. And 5 And, pub. 1967. 3. Author's testimony; your USSR №258042, cl. А 62 О 1 / ОО, ЗО.О9.68.