RU2422639C1 - Zolotaryov safe coal mine - Google Patents

Abstract

FIELD: mining. ^ SUBSTANCE: safe coal mine includes drilling of mine field with central and boundary inclined shafts, preparation of extraction pillars with out-post gates, development of extraction pillars along the spread of bed with longwall faces by using high-efficiency mechanised complexes. Degassing of the worked-out area is performed owing to penetration between conveyor and ventilation gates of ventilation channel of annular section, by means of which methane is pumped out from the worked-out area to the surface during second working. Degassing of coal bed in bottom-hole area is performed owing to drilling at an angle to line of mining face of well during driving of conveyor and ventilation gates; at that, fresh air is pumped through some wells to mining face, and dust-loaded and gassing air is pumped out through other wells from the mining face. Header from delivery air blower by means of which air-water mixture is supplied to mining face is connected to branch pipes of wells on conveyor gate. Header from suction fan by means of which wet dust-loaded air is pumped out of mining face is connected to branch pipes of wells on ventilation gate. ^ EFFECT: possibility of performing secondary working without restrictions as to gas factor. ^ 5 cl, 1 dwg

Description

The invention relates to the coal industry and can be used in the design and operation of coal mines, practicing gas-bearing, fire hazardous seams.

Known coal mine for mining fire hazardous gas-bearing coal seams. The coal seam is worked out by long working faces along strike with complete collapse of the roof rocks. The extraction column is outlined with a conveyor drift and a ventilation drift. Excavation columns work out in a descending order. Preliminary degassing of the formation is carried out by drilling wells from the ventilation drift parallel to the face. Suction of methane from a coal seam is carried out through a degassing pipeline using vacuum pumps. The exhausted space is degassed by drilling wells from the surface and suctioning methane through the casing (Korovkin, Yu.A. et al. “Theory and Practice of Long-Lava Systems”, Izd. Tekhgormash LLC, 2004, pp. 492-495 )

The disadvantage of this technology for coal mining is the low efficiency of the degassing of the coal seam. The well coverage area does not exceed 20 m. Therefore, it is necessary to drill a large number of wells. Piping gas through pipes is a very time-consuming and dangerous process. Drilling wells from the surface is associated with the need to have a large number of wells with a very complex pipeline network.

The well-known "Safe coal mine Zolotareva for mining gas-bearing, fire hazardous coal seams", patent of the Russian Federation No. 2310073 from 11/10/2007. A feature of this technical solution is the mining of excavation columns in an ascending order. Mining operations are carried out without leaving a coal pillar due to the passage of a two-section drift with a dividing concrete filling wall. The exhausted space is degassed by an overlying intermediate drift and then by an isolated flank inclined shaft to the surface.

The disadvantage of this invention is the high cost of the concrete filling wall, which does not compensate for the benefits of the aimless technology of coal seam mining. In addition, the issue of coal seam degassing has not been addressed.

The aim of the present invention is the creation of a safe coal mine for the development of gas-bearing, fire hazardous seams due to the new scheme for the degassing of the worked out space and the new scheme for the degassing of the coal seam.

This goal is achieved due to the fact that coal mining is carried out in one extraction column, cut along the strike of the column from the central inclined shafts to the flank degassing inclined shafts due to the passage of the conveyor and ventilation drifts, as well as the passage of the ventilation channel between them.

The mining of the excavation column is carried out by a slaughter along the strike of the formation with ventilation of the working face according to a reciprocal-accurate scheme. Fresh air is fed through the conveyor drift. The outgoing stream is diverted through the ventilation drift.

Coal seam degassing is carried out only in the zone adjacent to the face due to wells drilled obliquely to the face of the face. At the same time, due to the weakening of the coal mass by microcracks in the well zone, constant degassing of the coal seam in the bottomhole zone is achieved. The use of fresh air injection together with the spraying of water through one well, and the suction of moist dusty air through other wells contributes to the effective degassing and dedusting of the bottom face during coal mining.

The exhausted space is degassed by methane suction to the surface through the ventilation channel located between the conveyor and ventilation drifts. Due to the installation of a suction fan on the surface, it is possible to pump methane from the worked out space onto the surface and prevent methane from penetrating from the worked out space into the ventilated face zone.

After working out the extraction column, a ventilation channel is used to pump methane from the pillar of coal and rocks around the coal pillar.

An example implementation of the proposed safe coal mine is shown in the drawing.

A safe coal mine with a production capacity of 5.0 million tons per year includes a two-wing mine field with a length of 6 km. A two-winged mine field is opened by the central three-section inclined shafts 1 and two groups of flank inclined shafts 2.

Cleaning works are underway in one wing of the mine field, and preparatory work is underway in the other mine field.

The mining of the excavation column is carried out by the face 3 with a length of 300 m along the strike of the formation. Roof management - full collapse with the repayment of two drifts behind the face. Coal mining is carried out using a coal processor. Mounting of the working face - mechanized support. Coal transport is carried out by conveyor drift 4 to the central inclined shaft. Delivery of equipment and materials is carried out by the ventilation drift 5.

Fresh air is fed through the conveyor drift. The outgoing stream is diverted through the ventilation drift.

The coal seam is degassed only in the area adjacent to the face. When crossing pre-drilled wells 6 with a working face, fresh air flows through the wells from the conveyor drift into the bottomhole zone.

A dusty jet is removed from the bottomhole along the wells from the ventilation drift. Due to the presence of the required number of wells, microcracks form in the bottomhole zone. As a result, the coal seam is continuously degassed in the bottomhole zone. Forced injection of fresh air into the wells contributes to the dispersion of water in the bottom, which contributes to the extinguishing of dust. From the side of the ventilation drift, a suction fan pipe is connected to the wells, with the help of which methane and coal dust are sucked from the bottom hole.

The exhausted space is degassed by methane suction to the surface through the ventilation channel 7, which is formed between the conveyor and ventilation drifts. During the sinking, wells are drilled from the ventilation channel into coal and rock masses to ensure intensive methane degassing. The presence of a ring lining with anchor allows you to save the ventilation duct. In this case, the percentage of suction methane may contain industry standards for its use in gas engine electric units that provide electricity for the needs of the mine.

Preparatory work is carried out by driving a conveyor drift, a ventilation drift and a ventilation channel between them 8.

To ensure intensive degassing of the bottom-hole zone, a series of long wells are drilled through the coal seam at an angle to the line of the future face. To ensure effective degassing of the worked out space behind the face, a series of short wells are drilled around the ventilation duct.

After working out the extraction column, a ventilation channel is used to pump methane from the coal pillar and nearby rocks to generate electricity.

The specified scheme of a safe coal mine provides safe working conditions for miners. Allows to carry out cleaning work without restrictions on the gas factor. The load on the working face, depending on the capacity of the mined seam, can reach 10,000-20000 tons of coal per day. Due to the degassing of the worked-out space when landing large blocks of the hard-to-collapse main roof, there is no instant extrusion of the methane-air mixture from the worked-out space into the bottomhole zone and, accordingly, there is no dangerous situation with a possible methane explosion.

Claims (5)

1. Safe coal mine, including opening the mine field with central and flank inclined shafts, preparation of excavation columns with contouring drifts, mining of excavation columns along the strike of the formation with long working faces using high-performance mechanized complexes, characterized in that for ensuring the safety of mining operations by the gas factor:
- degassing of the exhausted space is carried out due to the passage between the conveyor and ventilation drifts, the ventilation channel of the annular section, with which methane is sucked onto the surface from the exhausted space during cleaning operations,
- coal seam degassing in the bottomhole space is carried out by drilling at an angle to the bottomhole line of the wells during conveyor and ventilation drifts, while through some wells, fresh air is injected into the bottomhole, and dusty and gassed air from the treatment outlet is sucked through other wells slaughter. 2. Safe coal mine according to claim 1, characterized in that on the conveyor drift to the nozzles of the wells connected to the manifold from the blower, with which serves the air-water mixture into the working face. 3. The safe coal mine according to claim 1, characterized in that on the ventilation drift, a collector is connected to the nozzles of the wells from the suction fan, with which moist dusty air is sucked from the face. 4. Safe coal mine according to claim 1, characterized in that during the passage of the ventilation duct into the coal and rock mass, wells are drilled to suck methane during subsequent treatment operations. 5. The safe coal mine according to claim 1, characterized in that after working out the extraction column, a ventilation channel is used for pumping methane from the coal pillar and nearby rocks to generate electricity.