SU1613638A1 - Method of airing mine workings - Google Patents

Abstract

The invention relates to the mining industry. The goal is to increase the efficiency of ventilation of mine workings due to the intensification of destruction of layered and local accumulations of methane and dilution and removal of hazards into the outgoing jet of the mine. A pulsating jet is fed into the zone of accumulation of hazardous substances in two opposite directions parallel to the longitudinal axis of the aired mine working. The frequency of unidirectional pulsations is assumed to be 5-20 HZ. The invention is intended for ventilation of through and dead-end workings hazardous in terms of layer and local hazard accumulations. When using the dead-end method, the intake of the fan must be installed in the opening zone of the semi-infinite jet emanating from the discharge pipe. In this case, one outlet should be directed to the zone of accumulation of harmful substances, and the other preferably in the working area. 5 il.

Description

The invention relates to the mining industry and can be used for ventilation of through and dead-end workings hazardous in layer and local accumulations of gas, as well as dust.

The aim of the invention is to increase the efficiency and reliability of ventilation of mine workings due to the intensification of the destruction of layer and local gas accumulations, dilution and removal of hazards into the outgoing jet of the mine, as well as the elimination of the negative impact of a unidirectional pulsating jet on the stability of ventilation flows in the ventilated mine and in the mine as a whole.

FIG. Figure 1 shows a diagram of the ventilation of mine workings in the presence of an areal long source of low intensity (up to 1) forming a layer accumulation in a continuous work: in FIG. 2 shows the ventilation pattern at an intensity source of more than 1 m / min; in fig. 3 is a diagram of the ventilation of a dead-end mine: in FIG. 4 shows an apparatus for carrying out the method; in fig. 5 shows section A-A in FIG. five.

In order to ventilate the mine workings 1 by eliminating layer and local gas accumulations, as well as dust (hazard 2) in it, the fan 3 is activated with pipelines 4 having two exhaust ports 5 and 6, and nlp in opposite directions relative to COP (not shown) of generation 1. Pipeline A has a flow distributor 7. The direction of fresh air is shown in position AB.

The method is carried out as follows.

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Fresh air 8 is supplied to the outlet 1. At the accumulation zone of hazard 2, a pipe 4 is installed, into which air is sucked by the fan 3, the air passed through the flow distributor 7 is alternately directed to the outlet openings 5 and 6 of the pipe 4, creating a complex oscillatory movement air at the hazard zone 2, for example in FIG. 2 - a standing wave with a moving front over zone 2. At the same time, the air pulsations in the excavation 1 are amplified, and the aerodynamic drag is compensated by unidirectional flows coming out of the pipes 5 and 6, and their effect on the stability of the flows in the excavation and the mine as a whole does not appears. At the same time, the diffusion properties of the streams in the excavation 1, directed into the zone of accumulation of harmful substances 2, increase sharply, which makes it possible to more effectively ventilate the production of 1, intensively diluted and the removal of the harmfulness from zone 2 to the outgoing jet. The frequency of unidirectional pulsations is assumed to be 5-25 Hz.

The proposed method of ventilation is intended for ventilation of through and dead-end workings hazardous by layer and local accumulations of hazards. The scheme presented on. 1, it is advisable to use when an areal, extended (more than 15 m) source of low intensity (up to 1 m / min), forming a layer accumulation in a continuous excavation. Fan 3 (Fig. 1) is located on a fresh stream, above the layer accumulation with the placement of suction no closer than 10 m from the accumulation. The volume of fresh air supplied to the production is determined by the maximum permissible concentration of the gas in the working atmosphere, downstream of the layer accumulation.

If the gassing source that forms the layer accumulation has an intensity of more than 1 m / min, but not more than the intensity, which would cause an excess of the MPC of gas in the ventilation stream behind the layer accumulation, and has a character of the type of a souffle with an length of less than 15 m, then it is advisable apply the circuit shown in fig. 2. At the same time, the intake of the fan can also be located under layer accumulation, if the gas concentration in this area is lower than the MPC or the gas-suction fan. If the gas concentration in the suction zone does not correspond to the PB, then it should be located higher along the ventilation stream and no closer than 10 m from the layer accumulation.

When using the dead-end method, the intake of the fan should be installed in the opening zone of the semi-infinite jet coming out of the discharge pipe, and the outlets 5 and 6 should be directed one to the hazardous area, and the other preferably to the working area.

The device for implementing the method can be made in the form of a drive 8 of a rotating flow distributor 7,

made in the form of a hollow cylinder 9 and having one base from the drive side, there are two orifices 10 on its side surface, the axes of which are located at an angle of 180 °, and a central angle built from the edges of each of them. is 90 °. The rotating flow distributor 7 is placed coaxially in the ventilation casing 11 having an opening (not shown) to which the fan 3 is connected on the opposite side from the drive 8. The ventilation casing 11 has two outlets 12 with inlets 13. The outlets 12 are located under an angle of 90 °; pipelines 4 are attached to them, the outlet openings 5 and 6 of which are directed in opposite directions, parallel to the axis of the aerated excavation (not shown in Fig. 4, 5).

The device works as follows.

The fan 3 continuously supplies air to the casing 11. The rotation of the flow distributor 7 is provided by the operation of the drive 8. When it rotates, the openings 10 alternate with the openings of the ventilation casing 11 to which the taps 12 are attached. In addition, in the pipes 4, the outlets 5 and 6, pulsating air movement is generated. Weekends

The openings 5 and 6 of the pipelines 4 are directed in opposite directions, parallel to the axis of the ventilated excavation (at an angle of 180 °). During one revolution of the rotating flow distributor, two unidirectional pulsations occur (a total of 4 in different directions).

The drive, depending on the constrained output, location and installation of the device, temperature, air humidity, provides 2.5-12.5 revolutions per second (5-25 Hz of the same pulsations).

Formula of invention

The method of ventilation of mine workings, including the flow into the zone of accumulation of harmfulness of a pulsating jet, characterized in that, in order to increase the efficiency of aeration of mining workings due to the intensification of destruction of the layer and local accumulations of methane and dilution and removal of harm into the outgoing jet of the mine, supply the pulsating jet is carried out in two opposite directions parallel to the longitudinal axis of the ventilated mine workings, with the frequency of unidirectional pulsations being equal to 5-25 Hz.

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Claims (1)

Claim A method of ventilating mine workings, including supplying a pulsating jet to a hazard accumulation zone in ¹ zone, characterized in that, in order to increase the efficiency of ventilating the mine workings by intensifying the damage 5 b of layer and local accumulations of methane and dilution and removal of harmful substances into the mine’s outgoing stream, the pulsating stream is supplied in two opposite directions parallel to the longitudinal axis of the aired mine, and the unidirectional pulsation frequency is assumed to be 5-25 Hz. Figure 1 FIG. g Editor N. Horvat Figure 5 Compiled by L. Serov Tehred M. Morgenthal Corrector A. Obruchar Order 3874 Circulation 370 Subscribed VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.