SU796461A1 - Method of creating neutral medium in blind working - Google Patents

Description

(54) METHOD OF CREATING AN INERT ENVIRONMENT IN A BLIND DEVELOPMENT

on the basis of production, use a temperature sensor.

The drawing shows a dead end of the forge, making a general view.

Deadlock hearth generation 1 has a jumper 2 that overlaps the cross-section of the mine and at the mine arch made in the form of a labyrinth 3, in the last section of the labyrinth, counting from the bottom, the instrumentation is installed - sensor 4 on i temperature registration (when the mine atmosphere is completely displaced by pairs liquefied or solidified gases, the temperature drops sharply) or a gas analyzer for oxygen. On the sweat line between the lintel and the bottom of the dead-end mine is placed liquefied cryogenic liquid (nitrogen) or solid carbon dioxide (dry ice) 5.

The method is carried out as follows.

After charging the holes and installing the electropnelling chain in a dead-end mine for 1 m 1.5 m from the bottom, a sealing labyrinth jumper is installed at the arch, using foam plates reinforced around the perimeter with an elastic material. In the last section of the labyrinth, a sensor is installed to register the temperature change or sensor gas analyzer for oxygen (preferably. The first).

When performing the described works, the passageway is left in place to fill in the soil with the production of liquefied nitrogen or the filling of solid carbon dioxide, after which the passage is closed with a foam slab.

The method uses a jumper and elements of the labyrinth of low-inertia materials of foam plates, thrown off by air shock waves during blasting of blast-hole charges, which allows repeated use of the equipment used.

It is also possible to overlap the central part of the production section with Kraft sheets - cellulose paper - in the variant of the disposable jumper part (with the obligatory use of elements of elastic foam to tightly isolate the zone between the part of the folding frame and the walls of the excavation).

After the mine atmosphere is displaced by the evaporating gases, blast-hole charges are blown up, and the foam plates are thrown away by air shock waves and the bottom with the inert atmosphere and the gaseous products of the explosion becomes available for ventilation with effective ventilation.

The proposed method provides a uniform distribution of inert gas throughout the bottomhole space. The evaporating gases (nitrogen or s-acid gas) with low temperature first fill the lower generation zone, gradually expelling the mine atmosphere to the roof and exit 1 through the labyrinth, which is reliably monitored by the sensor of the gas stream leaving the labyrinth. Liquefied gas poured onto the ground quickly evaporates due to the close contact of the solid and liquid phases. Thus, the process of inertization of liquefied gases is carried out without the use of special evaporators and design-related complications associated with this.

The evaporation of solid carbon dioxide can be accelerated by crushing pieces of dry ice,

what can be done by walking the shooter over the carbon dioxide scattered on the ground - solid carbon dioxide.

The ratio of liquid / gas volumes in cryogenic substances is almost three orders of magnitude greater.

and for liquid nitrogen it is 1/700 and the transportation of liquid nitrogen in compact thin-walled cryostats with closed-vacuum insulation is considerably less labor-intensive than the transport of compressed gases in cylinders; dry ice can

transported in bags.

The advantages of the proposed method of creating an inert environment in a dead-end mine are included in expanding the field of application of the method by using it in mines and mines, developing various minerals, as well as in accelerating the process of inertization of a dead-end mine working.

Claims (4)

1.-A method of creating an inert environment in a dead-end mine, which consists in isolating the bottomhole space by making a hole mine by constructing a jumper with a labyrinth intersecting the cross section of the dead-end mine, setting it in the last, counting from the bottom of the labyrinth of the instrumentation, which analyzes the gas composition , displacing the mine atmosphere from the isolated space with an inert agent and controlling the inertization process of the bottomhole space by means of instrumentation, analyzing the gas flow of the isolated wellbore space, characterized in that, in order to expand the field of application of the method and speed up the inertization process, the labyrinth is built at the roof of the mine, and an inert agent serving 5 displacement of the miner atmosphere from the isolated space, is placed on the soil of the mine between the lintel and the bottom of the tupi. 2. A method according to claim 1, characterized in that liquid nitrogen is used as an inert agent for displacing the mine atmosphere. 3. The method according to claim 1, which is the fact that solid carbonic acid is used as an inert agent that serves to displace the mine atmosphere. 4. Method according to paragraphs. 1-3, characterized in that as a kosorol-measuring apparatus for controlling the process of discharging the mine atmosphere with an inert agent placed on the soil of development, use dagoos 1 temperature 1 W 4 Yet Accepted Information Forms Accepted “About Your Expert Review 1.Rais J.C. Extraction of coal in mines with an oxygen-free atmosphere, Mining, 1971, K 11, p. 38 2. Autograph of the USSR N 608002, cl. E 21 F 5/00, 1975.