SU1388565A1 - Method of localizing a fire - Google Patents

Abstract

The invention relates to mining. The purpose of the invention is to increase the safety of mining operations. Isolate the fried area from the operating current. Ventilate the air and supply air to the fire zone. Fire gases are removed through an insulated gas pipeline and ozone is introduced into them. To reduce the discharge of fire gases, the superheated steam is introduced into the gas pipeline. To increase the safety of mining operations without stopping the clearing hole during fire extinguishing in the exhausted space, air flow is regulated through the working space as the cleaning plant moves along the j, jC ( 1–1 / 0.3 LA), where, 175–0.2 is the empirical coefficient,%, Q is the air flow rate at the production site, m / min. L is the length of the lava, m, 1 is the distance from the insulating strip to Ava, m. 2 ZP f-ly, 2 ilo - S (L

Description

The invention relates to mining and is intended for localization of fires in the laboratory area of excavation sites and dead-end mining workings.

The purpose of the invention is to increase the safety of building work without stopping the cleaning face during fire extinguishing in the cultivated area by neutralizing and reducing the smoke content of fire gases.

FIG. 1 shows a scheme for implementing a method for localizing a fire in

la 0.001 2ob,%, which is below the maximum permissible rate.

In an attempt to reduce the air Qg supplied to the developed space, below the calculated periodical flashes and explosions occurred in the developed space. This indicated the occurrence of explosive concentrations of methane in the area of the fire. When supplying more than the calculated air flow rate into the overfilled air space, the amount of combustion products in the outlet

Above-air space, in Fig „2 fire gases, which indicates

scheme for implementing a method for localizing a fire in a dead-end operation.

Example. During the development of the coal seam 1, a fire arose in the overfilled area of lava 1. In order to localize the fire in the farfatan space 2, a buttery strip 3 was erected, separating the refinery from the fabated space. The stub parts of the retractable 6 and vent 7 drifts. In jumper A, window 8 was left with the flow regulator BO3; jyxa, and through jumper 5, a rigid vent pipe 9 with ejector 10 at the end of about 1 was passed

In addition, a pipe 11 was installed for Pemigak 5 to supply ozone from a 12,000 photocopy installation. To ventilate the area, Q. was applied, air, while

40

45

the outgoing stream contained 0.9% methane o Through the air supply regulator into the mined-in space, air was supplied (0.9 (1-0) 135 air (at)). As the lava moved away from the rubble strip, air flow was controlled according to the formula , and at a distance of 3x200 60 m, the air supply was completely shut off. During the entire period of air supply to the insulated air in the exhaust air from the source of the fire, ozone was supplied to bridge 5. Air supply of the oxidizing gas to the fire gases provided neutralization their dovityh components therefore, the gases could be mixed with the air stream emanating from the lane. In the ventilation drift 7, the carbon monoxide concentration behind the mixer did not exceed the fire intensification.

The method is carried out as follows.

The overfilled area 2 of the clean-up area is isolated from the cleaning excavation by erecting the rubble strip 3, the Gypsum bridges 4 and 5 isolate the dead-end parts of the haulage rail 6 and the air passage 25 7. The jumper 4 is equipped with a vent window 8 with an air flow regulator and the jumper 5 is laid with a rigid vent pipe 9 with an ejector 10, Pa with a ventilation drift, a pipe 11 is placed to feed into the tube the gas oxidant

Exodus From Vphage C

 ) / min, where K - empiry, J bf ..

35 is the coefficient, 175-0.2%, Q is the air flow rate at the site, C is the concentration of methane in the upstream jet of the site,%, Ld is the length

50

lava, m, 1 — the distance from the lava to the insulating strip, m, determines the required amount of air supplied to the laboratory air space and feeds it through the window 8 from the air flow regulator. As the lava moves, the required amount of air is recalculated by the formula and its flow is adjusted through the window 8 with the air flow regulator. During the entire period of ventilation, a gaseous oxidant is supplied to the tube-shaped space through pipe 11,

Example. When conducting a haulage drift across the reservoir, a fire arose in the bottomhole zone due to methane from a friction spark. Blind topflux 13 with a length of 1100 m and a cross section in the penetration of 12.6 m was carried out with a combine of the type GPC and aired

about fire intensification.

The method is carried out as follows.

The cushioned space 2 of the clearing bottom is isolated from the treatment plant by erecting the rubble strip 3, Gypsum lintels 4 and 5 isolate the dead-end parts of the haulage 6 and vent 7. 7. The lintel 4 is equipped with a ventilation window 8 with air flow regulator, and through jumper 5 lay a rigid vent pipe 9 with an ejector 10, Pa; a vent 11 places a pipe 11 for supplying the flue gas to the heat exchanger space

Exodus From Vphage C

 ) / min, where K - empiry, J bf ..

c, coefficient, 175-0.2%, Q — air flow rate at the site,, C — concentration of methane in the outgoing stream of the site,%, L d — length

lava, m, 1 — distance from the lava to the insulating strip, m, determine the required amount of air supplied to the laboratory air space and feed it through the window 8 with the air flow regulator. As the lava moves, the required amount of air is recalculated by the formula and its flow is adjusted through the window 8 with the air flow regulator. During the entire period of ventilation, a gaseous oxidizing agent is supplied to the top tattered space through a pipe 11,

Example. When conducting a haulage drift across the reservoir, a fire arose in the bottomhole zone due to methane from a friction spark. Blind topflux 13 with a length of 1100 m and a cross section in the penetration of 12.6 m was carried out with a combine of the type GPC and aired

fan 1D type VMTs-8 according to the injection scheme with the help of a flexible pipe 15 with a diameter of 800 mm. Fresh air to the fan 14 came from the slope 16, and the spent air from the slab to produce 13 again went to the slope

16о When a fire occurs

The final 13 was filled all the way through with combustion products,

 It was not possible to stop its ventilation according to the injection scheme because of the increase in the concentration of methane from the reservoir up to the explosive threshold and the possibility of threatening the subsequent explosion of methane-bearing mixture Fire gases and smoke spread along slope 16, preventing mining operations in the whole mine. To conduct rescue and emergency operations, a gas-suction valve, type 18 VMGTs-7, was installed on the slope, to which the suction pipe 19 was connected from rigid pipes 0.6 m in diameter to the head pipe connected section 20 of flexible self-laying pipeline with inflatable stiffening ribs. The suction of the fan torn installation ensured performance not less, with maximum depression

In the area of the rigid suction pipe laid in slope 16, the nozzle of installation 3000 of type 3000-Photocopy, producing 5 O l / h of ozone, was connected. At a distance

The air jet ejector with a steam generator 22 was integrated into the suction pipeline. The supply of ozone gas into the pipeline reduced the content of toxic components of fire gases in slope 16 to safe concentrations, so the carbon monoxide content did not exceed 0.0015% by volume. After the ostyvank of superheated steam and its condensation, the smoke in the air on slope 16 was sharply reduced, which made it possible to increase the safety of mining operations in the mine floor wing. Periodic build-up of a rigid shutter of the suction pipe 19 to the length itself K

Uch vl- / j t i l i.

 1PP | 280 0.6 „, °° | -550

by ho

0

five

Q

n

The laying section 20 allowed the mine rescuers to work in making 13 in safe conditions and to speed up the fire extinguishing. The airing of the dead-end development was carried out continuously, therefore, it is possible to work on the area where the suction pipeline has already been laid without the means of individual respiratory protection.

Claims (1)

Invention Formula 1, A method of localizing a fire, which includes isolating the fire section from operating installations, airing the installations, supplying air to the fire section, and removing fire gases, characterized in that, in order to ensure safety of mining operations, fire gases are discharged through the insulated gas pipeline and injected ozone in them 2, Method pop, 1, characterized in that, in order to reduce the smoke content of the exhaust fire gases, superheated steam is introduced into the gas pipeline, Method Pop, 1, characterized in that, in order to ensure the safety of mining operations without stopping the clearing slab, during fire extinguishing in the developed space, the flow of air through the working space is controlled as the clearing blade moves according to C. (1-, Oh, for, ), five 0 where Рд „is the air flow rate through the tank; , 175- -0.2, - empirical coefficient, , Q - air flow rate at the mining site, m / min; С is the concentration of methane on the outgoing jet of the area, OBD; L is the length of the lava, m; 1 — distance from insulating strip to lava, m.