SU1502846A1 - Method of preventing endogenic fires in operating stopes - Google Patents

Abstract

The invention relates to mining. The goal is to increase the effectiveness of fire prevention. Along the lava, a high-pressure hose with branches, which are led out through the holes in the sections of the mechanized supports in the direction of the goaf, is hung onto the powered roof. A torch of the sprayed powder is formed through channels with branch sockets. A high-pressure hose is connected to a device for feeding urea powder, which is fed into the developed space after the support sections are moved. Powder consumption takes 2-3 kg per 1 m ^{2 of} exhausted space, depending on the tendency of coal to spontaneously ignite. Urea is sprayed with compressed air to close the spray plumes between them. The powder can be in the developed space for a long time, without changing its properties. 1 tab.

Description

The invention relates to mining, in particular, to the prevention of endogenous fires in flat and inclined seams, self-igniting, its coal, developed by mechanized complexes using direct ventilation circuits.

The purpose of the invention is to increase the efficiency of fire prevention, especially when mining coal seams with small incubation spontaneous combustion periods.

The way to prevent endogenous fires is as follows.

On the lava, a high-pressure hose with a

taps which are led out through the holes in the sections of the powered support in the direction of the goaf. The branches are provided with channels and end with sockets forming the plume of the sprayed powder. A high-pressure oshang is connected to a device for feeding carbamide powder, which is fed into the worked-out space following the advance of the support sections,

The fire hazard of the area depends on the time of sweeping the ventilated area of the overheated space, which is determined from the ratio

ate

ABOUT

to

x

four:

but

-7- N months с- where Н is the width of the ventilated area,

m;

V is the speed of advancement

slaughter, m / m

Conditions are fire flames.

at: x 1 and non-fire at

 one.

t- peak

Antipyrogen consumption is assumed to be 2–3 kg per 1 m of exhausted space, depending on the tendency of the coal to self-ignite, the duration of the incubation period, the rate of advancement of the clearing hole, and the nature of the distribution of coal losses in the developed space.

Flame retardant delivery mode depends

from dpina console when detecting the roof. The introduction of carbamide powder during the collapse of the roof rocks allows the entire volume of the exhausted space to be evenly processed near the powered support, the Powder is mixed with the collapsed massif and penetrates deep into the exhausted space under air pressure. When coal is self-heated, urea decomposes, absorbing heat and releasing an inert gas. Due to this, the process of oxidation of the coal is inhibited and the atmosphere of the mined space is inerted. The powder can be found in the developed space for a long time, without changing its properties.

Example I, The formation has a capacity of 2.5 N and a dip angle of 7-8. The direct roof is represented by argillite with a capacity of 1.0-1.5 m, the main roof is aleurolite with moderate resistance. The primary landing step of the main roof is 30-35 m, the secondary step is 13-20 m,

Coal of the G brand seam, prone to spontaneous combustion with an incubation period of 1.5 months. The length of the excavation column along the strike is 800 m, the length of the lava is 110 m. The excavation is carried out using the 2MKE complex with a speed of advance of the clearing slab 80 m / month. Into device

n

five

0

five

0

0

five

for supplying the Powder, a tank I dp 1 is supplied: the spray gun, a ShVKS type compressor 2 and a VAChS-7D type pneumatic discharger 3. Using cJnaT jro air, urea powder is transported through a high-pressure hose 4 and through the sockets 5 it is dispersed into the worked-out space. Beams are installed after 20 m on the basis that the flames of the powder sprayed through them overlap each other.

With a width of 120 meters of ventilated area and a bottom speed of 80 m / s, the movement time of the aired zone is C 1.5 months, a / - ratio - ;; 1.0, t, e, created by the KIC.

Conditions dp for the occurrence of endogenous fire and preventive treatment is required. By the duration of the incubation period of 1.5 months, the consumption of urea should be 2.0 kg per I m of the area developed. The daily amount of carbamide for prophylactic treatment of the space developed is Q 660 kg. With a moderately stable roof of the reservoir, the length of the hanging console is 10–12 m, which allows prophylactic treatment to be performed in a day with the supply of 1320 kg of urea. With a plant capacity of 50 kg / min, the feed time for urea for each bell is 35-45 minutes, and for full processing of the lava, 3.5-4.0 hours. This feed mode and the accepted consumption of urea provides fireproof processing for the post.

Example 2 The conditions of the bedding and the development technology are similar to example 1, The difference is that coal is more prone to spontaneous combustion, has an incubation period of 0.5 months. Attitude

 3.0. According to the table

 INC

during the incubation period of 0.5 months. The consumption of urea per 1 m of exhausted space is taken as 3 kg. In this case, the consumption of powder for the processing of the goaf at a speed of 3 m / day will be 990 kg. The feeding technique does not differ from that described in Example 1. Through each socket, 198 kg of powder are fed to the rbamide in turn. Treatment

5I5

provides fireproof extraction of coal with an incubation period of 0.5 months.

Example 3. The bedding conditions, development and preventive treatment technologists do not differ from those shown in Example 1. The incubation period for the spontaneous combustion of coal is 0.5 months. The treatment conditions of the reservoir are fire hazardous as

- ;; 3.0. Carbamide powder consumption

 IIC

3.5 kg per I m of exhausted space or 1100 kg per day is selected. The treatment provides fireproof coal extraction, however, a high consumption of anti-pyrogen

day. The treatment will not ensure the fire safe removal of coal, since at the beginning of the auto-oxidation and decomposition of the inert gas emitted by urea, it will not be enough to inert the atmosphere of the developed space and the heat balance will not be observed.

When applying the proposed method 15 for preventing endogenous fires in existing clearing holes, it is not necessary to maintain constant heat and moisture vapor parameters for a long time.

unnecessarily increases the cost of prophylactic- 20, since carbamide powder retains

because

 1.0, steam consumption

KI1S

flame retardant 1.5 kg per I m of exhausted space or 660 kg in

day. The treatment will not provide fireproof coal extraction, since at the beginning of the auto-oxidation and decomposition of the inert gas produced by urea, it will not be enough to inert the atmosphere of the developed space and the heat balance will not be observed.

When applying the proposed method of preventing endogenous fires in existing clearing holes, it is not necessary to maintain constant thermal and humidity parameters of the developed space for a long time.

what processing.

Example 4. The bedding conditions, development and preventive treatment technologies do not differ from those shown in Example 1. The incubation period for the spontaneous combustion of coal is 1.2 months. The reservoir treatment conditions are flammable, since T

 1.25. Anti-powder consumption Inc.

A method for the prevention of endogenous 30 fires in operating clearances with a mechanized support, including the introduction of an anti-pyrogen into the developed space, the length of the cleaning face,

pyrogen is chosen at the rate of 2.5 kg

on 1 m of goaf or

825 kg per day. The processing provides .jg by the fact that, in order to increase the effective fire-safe excavation of fire prevention

Example 5. The bedding conditions, development and preventive treatment technologists do not differ from those shown in Example 1. The duration of the spontaneous combustion incubation period is 1.5 months. The treatment conditions of the formation are flammable.

Coal group I tendency to spontaneous combustion with the duration of the incubation period, months

0.5 - 1.0

1.0 - 1.5

1.5 - 2.0

Claims (1)

its preventive properties. The method can be used at any length of the clearing flank, it is more effective, since it allows localizing the self-heating foci of coal at the place of their origin. Invention Formula A method for the prevention of endogenous fires in operating clearances with a mechanized support, including the introduction of an anti-pyrogen into the developed space, the length of the clearing antipyrogen use carbamide powder, which is injected in an amount of 2-3 kg per 1 m of exhausted space after moving the support sections, while urea is sprayed with compressed air with overlapping spray plumes between them 3.0 2.5 2.0 1410 1175 940 Coal in zones of tectonic disturbances Coal subjected to high temperatures (in the area of decommissioned fires) 15028468 Table continuation 3.0 1D10 2.5 175