SU810990A1 - Pipeline for conveying foam through underground mine workings toward the heart of fire - Google Patents

Description

The invention relates to the field of mining and can be used to transport foam through pipelines laid in mine workings over long distances, for example, when fighting underground fires.

A known pipeline for transporting foam, consisting of pipe segments, operating on the principle of using air flow from the foam generator [1].

The disadvantage of this pipeline is that it does not have special devices to maintain the quality of the foam while ensuring the range of transport.

Known pipeline for transporting foam through underground mine workings in the fire, including interconnected pipe links, parallel to which is connected a foam generator 12].

The disadvantage of this pipeline is that with an increase in the range of transportation of the foam decreases the multiplicity of the foam and the stability of its structure.

The purpose of the invention is to increase the efficiency of fire extinguishing by maintaining the multiplicity and stability of the foam from the place of its formation to the place of unloading.

This is achieved by the fact that the pipeline is equipped with a foam structure stabilizer made in the form of a helical blade with a screw pitch of 180 ° and installed in place 5 of the connection of pipe links to each other.

The drawing shows a section of the main pipeline, equipped with a foam structure stabilizer.

The pipeline for transporting foam consists of pipe links 1, a main pipeline, at the joints of which, i.e., at the junction of the pipe links between each other, between the flanges 2 there is a screw blade 3, with a screw pitch of 180 °, fixed by means of a roller 4, rigid connections 5 and bolt connection 6. For the formation and transportation of foam use a foam generator (not shown).

The pipeline works as follows.

During the prevention or extinguishing of an underground fire in the waste space by the foam method, a pipeline is laid to the place of work 25 or the existing pipe line of the fire-irrigation pipeline, slurry pipe, air pipe, degassing pipe, etc. are used for these purposes. stucco removal from each other, depending on its cross section, foam structure stabilizers are installed in the joints of the pipes.

To inject foam under pressure, a foam generator (not shown) is connected to the pipeline via a flange connection. The foam formed during the generation process is pumped under pressure into the fire department. By its physical nature (inherent in gas-liquid systems), the foam is unstable and from the moment it is received into the drink, spontaneous processes immediately arise, leading to its destruction. As a result, at a certain section of its transportation through the pipeline, its structure changes. The change is associated with the draining of liquid in the interbubble films, with the elimination of the films. The films become so thin that the structural strength of the foam decreases sharply, while a light foam forms in the upper part of the stream, and more dense with the liquid phase of the foaming agent in the lower part of the stream. To prevent the destruction of the foam, the proposed stabilizers of the foam structure are installed. Encountering it on its way in the pipeline, the foam passes through the screw channel of the screw blade and rotates 180 °, while the heavier and denser part of it turns out to be in the upper part of the pipeline and envelops the yen bubbles, increasing the thickness of the films.

Redistribution occurs in the structure, its dispersion improves.

This pipeline for transporting foam allows you to save the multiplicity of the foam and ensure the stability of its structure, which will improve the effectiveness of the 5 actions of the foam in the prevention and extinguishing of underground fires by the foam method. The preferred place to install foam stabilizers in the pipeline is in places where the elevation is different.

Claims (1)

Claim A pipeline for transporting foam through underground mine workings at 15 fire sites, including interconnected pipe links and a foam generator, characterized in that, in order to increase the fire fighting efficiency by maintaining the multiplicity and stability of 20 foam from the place of its formation to the place of unloading, the pipeline equipped with a foam structure stabilizer made in the form of a helical blade with a screw pitch of 180 ° and installed at the junction of pipe links 25 to each other.