RU2343288C1 - Method of ventilation of long mining face - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to mining, particularly to method of ventilation of long mining faces. Method consists in fresh air supply into a mining face via air-supply working owing to all-mine depression and in exhaust of outgoing air stream via a gas-exhaust working. Additionally fresh air is supplied into the mining face at a mine section where it exceeds half length of the mining face from the air supplying working, for the purpose of which all-mine depression is ensured along the long directed boreholes; the latter are bored along the developed coal bed as before commencement of preparation of an extraction pillar, so during its preparation.

EFFECT: increased labour efficiency due to increased length of mining face.

1 dwg

Description

The invention relates to the mining industry, in particular to the coal, and can be used in coal mines to ensure effective ventilation of long treatment faces.

A known method of ventilating a excavation site (RF patent No. 2278977, class E21F 1/00, publ. 2006.06.27), including the supply of fresh air to the working face due to the shaft depression, through the air supply, the discharge of the outgoing air stream through the exhausted space into the exhaust production conducted from the surface, and the output of the outgoing stream of air through the air-emitting output.

The disadvantage of this method is that its scope has a number of restrictions on the power of the reservoir, the length of the face, the length of the extraction column, gas evolution and permissible concentration of methane gas when using surface gas suction units, as well as underground installations.

There is also known a method of venting a gas-rich extraction site (RF patent No. 2126889, class 6 E21F 1/00, publ. 1999.02.27), adopted as a prototype, including the supply of fresh air through the air supply due to mine depression and the discharge of the outgoing stream through the air exhaust and partly in the worked out space of the previously worked out adjacent extraction column.

The disadvantage of this method is that it does not provide effective ventilation when increasing the load of a long working face, and also that its field of application has a number of restrictions on the power of the worked seams, on the length of the working face, the length of the extraction column, gas evolution and allowable gas concentration methane in the use of surface gas suction and underground installations.

The objectives of the proposed technical solution are to ensure effective ventilation of the long face, increase the load on the long face, reduce the loss of time at the end operations during the development of the formation, as well as increase labor productivity by increasing the length of the face.

These tasks are achieved by the fact that in the method of ventilating a long working face, including supplying fresh air to the working face through the air supply due to the mine shaft depression and exhaust air stream through the gas outlet, according to the invention, additionally, fresh air is supplied to the working face in a section exceeding half of the length of the working face from the air supply, ventilation is provided for long directional wells due to mine depression, and the wells are carried out along the p zrabatyvaemomu coal seam, how to start preparing extraction pillar, as well as during its preparation.

The method of ventilation of a long working face is illustrated by the drawing, which shows a scheme of ventilation of a long working face, a top view.

The main supply of fresh air is carried out due to the mine shaft depression through the air supply outlet - 1. Washing the face - 2, the air stream goes into the air outlet - 3 and through the exhausted space - 4 there is a fault - 5, with the help of a gas exhaust fan unit - 6, and already the outgoing stream with a methane-air mixture - 7 passes the gas outlet - 8. An additional supply of fresh air to the working face, in a section exceeding half the length of the working face, is carried out through directional wells - 9 s but due to general mine depression. The drawing also shows 10 - pressure plot and 11 - flow lines of methane-air mixture.

In the diagram, parameter a shows the maximum length of the face, ventilated without the proposed method, parameters b and c show the maximum length of the face when using the proposed method with one and two directional wells, respectively. Pressure plots 10 show the dynamics of air flow in the face with the inventive method and without it.

As a result of the implementation of the proposed method, the airing efficiency of the long face is increased, the load on the long face is increased, the formation of gas hazardous zones in the bottomhole space of the long face, and labor productivity is increased by increasing the length of the face. This circumstance is extremely important for coal mines, which have modern and high-performance equipment, the potential of which should be fully utilized. It is known that the gas factor inhibits a further increase in the face. Reducing the gas factor allows for an increase in the real productivity of modern mining equipment.

Claims (1)

A method for ventilating a long working face, comprising supplying fresh air to the working face through an air supply due to a shaft depression and removing an outgoing air stream through a gas outlet, characterized in that additional air is supplied to the working face in a section exceeding half the length of the working face from the air supply workings, for which they provide general mine depression for long directional wells, the latter are carried out along the developed coal seam, as before wki excavation column, and during its preparation.