Method for ventilating cleaning faces during extraction of highly gaseous coal beds by long columns

FIELD: mining industry.

SUBSTANCE: method includes feeding fresh air along air ducts due to generic depression, and output stream is taken partially through supported mines due to generic depression and partially - through extracted space of extracted or previously extracted column by means of gas-sucking plant. Methane support control in fresh and output streams is maintained. From the surface into air duct a ventilation shaft is drilled and additional fresh air is fed therein in same direction with main stream. Adjustment of methane containment in air streams at extraction portion is performed by changing amount of air, fed additionally.

EFFECT: increased volume of fed fresh air without substantial reconstruction of ventilation system.

1 dwg, 1 ex

 

The invention relates to the mining industry, namely to the airing of the Stopes, and can be used when developing vysokogazonosnyh coal seams sloping and gently sloping fall of long columns.

A known method of ventilation of a mine site, which consists in the fact that fresh air supplied through mine depression contour extraction pillar workings, and a significant part of the outgoing air stream away through redeemable stope pillar mine slope and then vent the well equipped ghatotkacha installation, on the surface (USSR author's certificate No. 1567792, CL E 21 F 1/00, published in 1990, BI No. 20).

The main disadvantage of this method of ventilation is the lack of reliable ways of removal from stope outgoing air stream. As a result of compaction collapsed rocks constantly changing aerodynamic drag out space, making it difficult to challenge the outgoing jet and the maintenance of normal gas conditions in the wellbore space. In addition, the known ventilation scheme complicates the control parameters of the incoming fresh air stream.

A known method of controlling the emission when bestolkovoy improvement of the extraction field long posts, the conclusion is decomposing in that excavation field prepared for failover pair drifts, a fresh stream of air supplied through mine depression conveyer passage, and an outgoing stream of partially divert the vent passage and, in part, through ghatotkacha installation on unsupported conveyor drift previously spent post (patent USSR No. 1789031, CL E 21 F 5/00, published in 1993, BI No. 2).

The main disadvantage of this method is to limit coal production possibilities of fresh air for mining, which is associated with the existing fans, the cross-section of air supply openings, opportunities, regulation by means of ventilation structures, etc.

Proposed method of ventilation faces when developing vysokogazonosnyh coal seams long posts, including fresh air intake workings at the expense of mine depression, the outgoing exhaust air stream is partially supported by excavations at the expense of mine depression and partly through the stope working or previously worked post using ghatotkacha installation and monitoring of methane content in fresh and outgoing streams.

The difference of the proposed method is that the surface air production Buryats ventilation hole and taut it collinear with the main stream of the additional amount of fresh air, moreover, the regulation of the methane content in the air jets on the excavation site is carried out by changing the quantity of fresh air supplied additionally.

The proposed method of ventilation Stopes allows you to increase 1.5 times or more the quantity of supplied fresh air without substantial reconstruction of the ventilation system of the mine and schemes of training excavation sites.

The invention is illustrated by example in the drawing, which shows a diagram of the ventilation stope with submission of additional fresh air ventilation hole.

Preparation excavation of the site was performed Central 1 and 2 flanking slopes, vent 3 and the conveyor 4 drifts. Excavation field work long posts 5 along with the direction of the stope 6 from the flank of the slope to the Central. Shearer pillar prepare a pair of workings and can work on bestolkovoy technology airing on a combined scheme. Fresh air on the excavation site is produced at the expense of mine depression of the Central slope of 1 conveyer passage 4 and by discharge through the fan 7 through the vent hole 8 is drilled from the surface to the conveyor passage 4. Additional flow of fresh vozduhovyvoda on the conveyor drift and moves to Oistamo slaughter 6 collinear with the flow of fresh air, coming from the Central slope of 1, which is equipped with a ventilation gateway 9. Outgoing stream of air away from the stope partly due to mine depression vent passage 3, and partly through the goaf 10 working post or adjacent previously spent post on the flank slope 2 and then using ghatotkacha installation 11 placed in the bore 12, to the surface.

The proposed method was industrial testing at JSC "mine them. After S.M. Kirov" (managing company "Kuzbassugol") in 2003

It is established that when mining lava 24-46 excavation post by known techniques, adopted as a prototype, its average performance is limited by the gas factor at the level of 1000 t/day. This conveyer drift with slope into the lava at the expense of mine depression is served, in accordance with the calculation, 1031 m3/min of fresh air. Due to mine depression of lava vent passage is given 718 m3/min of air pollution, and using ghatotkacha installation through the mined-out area through the borehole to the surface - 313 m3/min

Because such performance is below level of profitability, it was decided to increase to 4,000 tpd. Due to the fact that mine does not have the resources to increase the supply who is the ear on the main ventilation fans, it is recommended to use the suggested method of ventilation with supply an additional quantity of fresh air through specially drilled from the surface to the conveyor tunnel ventilation hole. The performed calculations showed that when the hole diameter of 0.8 m its aerodynamic resistance is 1.8 toμand the fan should create pressure 762 daPa, which correspond to the characteristics of the serial fan TDC-16.

According to calculations to provide the daily load of 4000 tpd ventilation system excavation site must have the following parameters:

the amount of fresh air supplied

in conveyor drift with slope(Q1), m3/min 577

the amount of fresh air supplied

in the conveyor tunnel ventilation

the well (Q2), m3/min 1194

the amount of fresh air entering the

lava 24-46 (Qabout), m3/min 1771

the volume of polluted exhaust air

ventilation drift (Q’Ref), m3/min1171

the volume of polluted exhaust air

through goaf

ghatotkacha install (QRef), m3/min 600

Implementation of the proposed method of ventilation Stopes in the example provided:

increase in 4 times for the extraction of coal from the longwall face;

to enhance control of gas flows at the excavation site due to changes in flow and pressure of the additional flow of fresh air.

The necessity of increasing the amount of fresh air can also occur if the gas control is set to exceed the permissible concentrations of gas in the wellbore space or in any of the outgoing jets.

Thus, the proposed method allows with minimal capital expenditure to ensure safe working conditions by increasing gazoobilnosti excavation of the site and the load on the longwall face.

Method of ventilation faces when developing vysokogazonosnyh coal seams long poles along strike, including fresh air intake workings at the expense of mine depression, the removal of the outgoing jet for supported excavations at the expense of mine depression and the other part through the stope working or previously worked related post with ghatotkacha installation and monitoring of methane content in fresh and outgoing jets, characterized in that a surface is involved in air production Buryats ventilation hole and using the fan serves it collinear with the main stream of additional fresh air, and regulation of the gas content in the air jets on the excavation site is carried out by changing the quantity of fresh air supplied additionally.



 

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Vibrating feeder // 2247068

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1 dwg

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