SU1567792A1 - Method of airing mining district - Google Patents

Abstract

The invention relates to the mining industry, is intended for safety engineering and can be used in the development of high-gas-bearing coal seams of a gentle fall. The goal is to increase the ventilation efficiency by eliminating the need to liquefy methane in the outgoing jet and to ensure the accumulation of dust in the developed space. Fresh air is supplied at the expense of general depression in two contouring excavation pillar workings. The outgoing air stream is discharged through the redeemed generated space. The amount of air supplied to ventilate the mine site is determined by the mathematical p-le. Using this method can reduce the amount of fresh air supplied with a significant increase in the load on the bottom. 1 ill., 1 tab.

Description

The invention relates to the mining industry, in particular to safety, and can be used in the development of high-gas-bearing coal seams of oblique and gentle fall by long pillars.

The drawing shows a flow pattern for airing a cleaning intake area, a plan view.

The slope field is prepared to be worked out by three slopes, two slope 1 is track, and slope 2 is conveyor. The applied development system is long poles 3 along the strike with the reverse order of processing. At the border of column 3, there is a flank gas drainage coal 4, on which a ventilation well 5 is drilled from the surface 5. At the wellhead 5 there is a fan 6, for example, of the VMTs type. The extraction column 3 of the mining section 7 is outlined by the ventilation 8 and the conveyor 9 drift. From the conveyor drift 9 to the flank gas drainage slope 4, a coupling 10 is conducted for the outgoing jet 11 of section 7.

The ventilation according to this method is carried out as follows.

cl

05

one

.3

During operation of the mining section 7, fresh air 12 is supplied by the track 1, the conveyor 9 and the ventilation 8 drifts. At the same time, the ventilation of the mining area 7 is carried out by supplying fresh air 12 in a volume that provides dilution of the methane released from the exposed surface of the bottom and broken coal to acceptable standards. At that, removal of methane and the entire outgoing jet 11 of section 7 is carried out along the aerodynamically active channels formed in the zone of collapse of the column 3 to the gas drainage generation 4 (slope) and discharged to the surface through the well 5 using a gas-extracting fan 6, installed on its mouth. The required amount of air supplied to the conveyor 9 and the ventilation drifts 8 is regulated by means of the ventilation doors (no drawing on the drawing) installed on the conveyor drift 9. The processing is carried out with the repayment of the ventilation 8 and conveyor drifts 9.

The amount of fresh air 12 supplied at workings 8 and 9 is determined from the expression

About „100J.fJ -K | + im yz /)

H (s-sv) (1-k,) svk (m / min) "

where (lay the amount of air required to ventilate the mining site, m3 / min,

ten

J

sh

KSh

8JU

- the amount of air entering the mining site 7, m3 / min is determined by the formula

Q

6.W

1 TO 1

- a coefficient characterizing the distribution of air and equal to the ratio of the difference in the amount of air entering and outgoing, to the amount of air entering the mining section 7, is determined depending on the coefficient in the table,

KV. - the coefficient taking into account air leakage through the worked-out space adjacent to the pre-aboriginal space of the mining site, with a returnable ventilation pattern, is determined by the formula

w.TZt exp (0.12fcp-0.24S04),

- removable reservoir capacity,

Mi

- the area of the cross-section of the pre-ejacular space of the clearing generation, m2,

-the average weighted fortress coefficient of the undermined rock mass on the scale of prof. M.K.Pro0

Q

och

five

0

H

the horse is at a distance of eight of its thickness;

the amount of air emanating from the cleaning operation to the interface with the bottomhole space with a dead-end conveyor tunnel, m3 min, is determined by the formula

H)

s-sG

och

R. p

-gas release from the exposed surface of the bottom and off the coal, me / min}

- allowable concentration of methane in the outgoing air, 7 ,;

3 I

methane concentration in the incoming fresh air,%;

the coefficient taking into account the share of methane removal from the wellbore space is determined depending on K and K "in the tabl of the face,

TO,

 yia Sj ± Jjilli Sfil

J P. JB

in

l

 To and)

-the intensity of methane entering the lava with a fresh stream along the drifts 8

and 9 m3 / min

-the coefficient taking into account the share of methane removal from the near-abnormal space to that produced in the absence of methane in the ventilation stream entering the lava is determined by the table; the amount of air supplied through the conveyor drift, m3 / min, is determined by the formula

to id

NShk

G Io.k

WITH

about. to

gas emission from transported coal to conveyor drift 9, m / min, permissible concentration of methane in fresh air supplied by conveyor drift 9,% 3

Fresh air 12 from the ventilation drift 8 enters section 7, while the main stream ventilates the bottom hole space, moving along the bottom, and part of the air saturated with methane and dust goes through the intersection openings in the mechanized complex into the developed space of column 3. Fresh the air 12, coming through the conveyor drift 9, also leaves in the goaf. Thus, the entire volume of air entering area 7, redistributed in the bottomhole space of column 3, goes into the worked-out space, moving in the active zones of rock caving, pressing down to

ten

677926

entirely angular At the same time, all of the 1az released from the reservoir under development, the host rocks, the overhead, undermined satellite layers are isolated through the developed space of column 3 to the gas drainage slope 4 and through the ventilation well 5 to the surface, and the coal dust formed during the operation of the cleaning combine It accumulates in the developed space of the lava.

During the transition to a mining face, geological disturbance (not shown)

15, in the treated column 3, the ventilation of the mining site is carried out

with partial maintenance of production

in the developed space near the zone

violation

20 The application of the proposed method of aerating the mining area in the development of a flat and inclined coal seam at the mine allows an increase in the efficiency of aeration,

25 reduce the amount of feed

Fresh air with a significant increase in the load on the face by eliminating the need to liquefy methane in the outgoing jet and ensure the accumulation of dust in the exhausted space.

g

Claims (1)

Invention Formula The method of ventilation of the production jc section, which includes supplying fresh air through the overall depression along two contouring excavation column and removing the outgoing air stream through the well to the surface, characterized in that, in order to increase the ventilation efficiency by eliminating the need to dilute methane in the end and ensure the accumulation of dust in the developed space, the discharge of the outgoing air stream is carried out through the reducible developed space, and the amount Q, y air required for ventilation of the mining area is determined from the expression  . UOLK 1Y (s-s0) (T-cr) + c7  OK where Jn is the maximum outgassing from the exposed surface of the bottom and off the coal, MJ / MHHj coefficient taking into account the share of methane removal from the near-bottomhole space to the developed one; coefficient characterizing the distribution of air and equal to the ratio of the difference between the quantities of air entering and outgoing, to the amount of air entering the mining site ten Jo to eight permissible concentration of methane in the outgoing air stream,% j methane concentration in the incoming fresh air,%, - gas emission from transported coal to the conveyor drift, m3 / min, the concentration of methane in the fresh air coming in through the conveyor drift,%. W