RU1805365C - Method of determining concentration limits of explosibility of multiphase mixtures containing water - Google Patents

Abstract

Usage: in laboratory studies, an explosive ™ to determine the fire and explosion hazard of the interaction of metal powders with water vapor. SUMMARY OF THE INVENTION: a mixture containing water is heated to a temperature not lower than the boiling point of water by adding products of combustion of hydrogen with oxygen. After the heating of the mixture is completed, powders of chemically active substances are injected into it, a mixture is initiated by a plane or cylindrical shock wave, and a change in the pressure and temperature of the mixture is recorded. Mixing of the mixture can be carried out during the heating process by the feed of the products of hydrogen combustion. 1 s.p. f-ly, 1 ill.

Description

The invention relates to the field of fire and explosion safety, and in particular to methods for determining the explosive properties of high-temperature multiphase mixtures containing water.

The purpose of the invention is to expand the research range of water-containing high-temperature multiphase mixtures.

This is achieved by heating the mixture, the liquid component of which is water, to a temperature not lower than its boiling point by adding products of hydrogen and oxygen combustion, then reactive particles with water are fed into the mixture, and the initiation is carried out by a plane or cylindrical shock wave.

In order to simplify the process, stirring is carried out by flowing the products of combustion of hydrogen with oxygen. Heating the mixture by adding the products of the combustion of hydrogen and oxygen, that is, high-temperature water vapor, does not distort the composition of the mixture, since its main component is also water.

The total concentration of water in the test mixture consists of those initially introduced into the chamber and introduced as the products of combustion of hydrogen and oxygen. The amount of combustion products is selected based on the required energy release for heating the mixture. The maximum temperature of the mixture is obtained with the introduction of water only

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with about

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in the form of products of combustion of hydrogen and oxygen. ,

Particularly reactive with water particles are added to the mixture after completion of its heating and immediately before initiation, which excludes their interaction at the stage of preparation of the mixture and does not thereby distort the completeness of modeling the state of the mixture. Initiation see, fs shock wave models; extreme situation. In this case, the shock wave can be either flat (local detonation) or cylindrical (large detonation).

Mixing the mixture by the flow of combustion products is carried out simultaneously with heating by introducing them into the bottom of a vertically mounted reaction chamber, which eliminates the need to study auxiliary elements for circulating the test mixture. Prevention of the destruction of the reaction chamber is possible by completely sealing it with high strength plugs.

A diagram of a device that implements the method is shown in the drawing. The reaction chamber 1 is equipped with pressure sensors 2 and temperature 3. Connected to the chamber: a device for supplying water 4, a device for supplying powders of chemically active substances 5, and a combustion chamber for hydrogen with oxygen 6, equipped with systems for supplying hydrogen 7 and oxygen 8. The reaction chamber equipped with a pumping system 9 with shut-off valves 10 and charges for generating shock waves: flat 11 or cylindrical 12 ..

 The claimed method is implemented as follows. The test mixture is prepared in the reaction chamber 1 by supplying water from the system 4 and gaseous components from the systems 7 and 8. The shut-off valves 10 are opened and mixed

the mixture by the pumping device 9. Heated. the mixture obtained by adding combustion products in the chamber 6 of hydrogen and oxygen supplied from systems 7 and 8.

Particles chemically active with water are fed into the mixture from system 5. The parameters of the mixture are controlled by sensors 2, 3, as well as by dosing the supply of components. Initiate the mixture by the source of the shock wave 11,

or 12 and record the change in pressure and temperature by sensors 2, 3.

In order to simplify the method, the pumping system 9 is turned off, shut-off valves 10 are closed, and the mixture is stirred during heating by convective flow of hydrogen and oxygen products of combustion, which are supplied from the combustion chamber 6 to the bottom of a vertically mounted reaction chamber 1.

Claims (1)

1. A method for determining the explosive ™ concentration limits of multiphase mixtures containing water, comprising preparing a mixture with controlled parameters in the reaction chamber, carried out by mixing the liquid and gaseous components supplied to it, initiating the mixture and recording changes in pressure and temperature, distinguishing South and in order to expand the determination range, the mixture is heated to a temperature not lower than the boiling point of water by adding products of the combustion of hydrogen with oxygen, the mixture is chemically active with water in a powder state, and the mixture is initiated by a plane or cylindrical shock wave. . The method according to p. 1, about t and h and yuy and with the fact that, in order to simplify the method, the mixing of the mixture is carried out simultaneously with heating due to the flow of the supplied products of the combustion of hydrogen with oxygen.