SU1476151A1 - Method of controlling gas releasing while mining closed seams - Google Patents

Abstract

The invention relates to the mining industry. The goal is to increase the efficiency of gas emission control when mining coal seams prone to spontaneous combustion by reducing the endogenous fire hazard. Before working on the closest P by long pillars along the strike with the aimless technology, an assessment is made of the degree of endogenous fire danger of each P in the suite. Development begins with the least fire hazard in the downward order. Subsequent earned and completed jobs are developed in ascending order. Removal of the gas-air mixture from the spent space of the initially spent gas is produced through the drainage drift to the air exhaust. The drainage drift is conducted along the lower P of the developed group of closely spaced P and connected by means of drainage cross-sections (DK) with ventilation drifts of the first pillars of the overlying P. At the mouth of the ductwork, a fan is installed to regulate the supply of undercut air. At the beginning of the recreation center equip the lock chamber with adjustable windows. In the DC set jumpers with adjustable windows. As the clearing fence moves away from the column being worked, the adjustable windows of the DC, located at the shortest distance from the bottom, are opened and the adjustable window of the far DC is closed, keeping the number of open windows unchanged. 3 il.

Description

one

The invention relates to the mining industry and can be used in the development of a suite of high-gas-bearing coal seams, prone to spontaneous combustion, in long columns along the strike with purposeless technology.

The purpose of the invention is to increase the efficiency of gas emission control when mining coal layers that are prone to self-ignition by reducing the endogenous fire hazard.

FIG. 1 shows an example of control of gas evolution during the development of a group of contiguous formations during the period of excavation of the least fire-hazardous formation; figure 2 - the same, with the excavation of undermined layers; on fig.Z - that

however, when excavating plastered

TOV.

Before working out the excavation field, an assessment is made of the degree of fire hazard of each formation. When developing a group of contiguous fire-hazardous formations 1-4, the drainage drift 5 passes through the underlying formation 1 and is connected by wells or drainage cross-sections 6 to the ventilation drift 7 of the first column, which was taken for the initial development of the formation 2. The formation, the coal of which is less prone to spontaneous combustion, or a formation that can be worked without loss of coal. Reservoir 2 is being developed at full capacity according to the aimless technology with long pillars along the strike in a downward order. Undermined 3,4 and overworked 1 layers are developed in long pillars along the strike according to the objectiveless technology in an upward order. The excavation along seam 2 is carried out taking into account the need for additional processing of layers 3 and 4 on the entire area of the excavation floor, i.e. The lower boundary of the excavation of the formation 2 (the location of the drift 8) is determined by the displacement angle Y of the interlayer formations. When mining layer 2, released methane and air leakage through the spent space 9 is diverted to the ventilation drift 7 and through drainage crossbars 6, equipped with jumpers 10 with windows, to the drainage drift 5. From the drainage drift through the exhaust pipe or well 11 methane drainage tons to the outgoing mines, to the day surface or directly to the methane consumer. Windows in lintels 10 are opened and closed alternately as the stope faces are pushed. As a result of the excavation of the formation 2, the under-developed formations 3, 4 are unloaded and inter-thickness cracks 12 are formed, extending into the worked-out space 9 of formation 2. The development of the formation 4 begins from the lower boundary and is driven by long columns along the direction in an objective-free technology. . Due to the compression created in the downhole, and the depression created by the fan 13, the gas through the cracks 12 enters the depleted space 9 of the formation 2 and is then drained

ten

15

20

25

ny drift 5 according to the previously described scheme. Layer 3 is also processed in a similar way. - The workup of reservoir 1 under development is also carried out from the lower boundary and proceeds in an upward order similarly to work on reservoir 4. Gas from coal and the reservoir clearance of reservoir 1 along fractures 14 resulting from the workover, goes out the depleted space 9 of layer 2 and further is diverted into the drainage drift 5.

In order to maintain 9 voids in the developed space for the active migration of methane over the entire development time of a group of contiguous layers, it is periodically treated with water in a closed cycle. In the development of seams of coal, prone to spontaneous combustion, the space developed is treated with aqueous solutions of anti-pyrogen.

The distance between the initially worked and worked up layers (NP) is chosen from the condition

.. ™ Hn 30mBpnft,

where m

at. R. pp

- removable capacity of the initially developed reservoir, m.

five

0

five

0

five

Claims (1)

Invention Formula The method of gas emission control in the development of contiguous formations, including the excavation of the excavation floor with long columns along the strike, the excavation using targetless technology with the removal of the gas-air mixture from the exhausted space to the air outlet through the drainage drift conducted through the underlying formation of the group of the adjacent formations and connected by drift. the vents with the ventilation drifts of the first pillars of the overlying layers, the installation of a fan at the mouth of the air vent Control and regulation of the supply of fresh air, placement of jumpers in the drainage cross-sections with adjustable windows as you move the cleaning hole, are distinguished by the fact that, in order to increase the efficiency of control of gas generation during coal mining, prone to spontaneous combustion , by reducing the endogenous fire hazard, Before mining the excavation field, an assessment is made of the degree of endogenous fire hazard of each layer in a pool of contiguous layers, and the development is started from the least fire-hazardous layer, and it is worked out in descending order, and the subsequent development of earned and. The overburdens are produced in an upward order with the gas / air mixture diverted to the drainage drift through the interlayer and the open space of the initially exhausted reservoir. 1H Phases. 3