RU2332571C1 - Method of removal of radon from railway tunnels - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the ventilation of transport tunnels, namely to the method of removal of radon in railway tunnels. This includes the movement of streams of air under action of a moving electric locomotive. Before entering the tunnel on the electric locomotive flaps open and create strengthening to the pressure of streams of air, they will carry radon from stagnant zones of sewage chutes, mix it in a turbulent stream of air and ejected through existing ventilating system, after passage of the tunnel flaps on an electric locomotive are clean.

EFFECT: ensures a sufficient yield force of the pressure of air streams for removal of radon from sewage chutes of a tunnel.

2 cl, 2 dwg

Description

The device is designed for weathering radon in railway tunnels.

A known method of limiting the flow of radon into mine workings [1].

The specified method involves drilling wells from the mine workings into the surrounding rock mass and pumping radon through the wells, characterized in that in the near-well part of the well create and maintain a pressure exceeding the pressure in the wellbore.

It is not possible to use this method in the removal of radon in a railway tunnel, since the generated and maintained pressure in excess of the pressure in the tunnel does not ensure the removal of radon from the surface of wastewater flowing in the trays.

There is also known a method of venting a gas-rich extraction site [2].

The essence of the method for ventilating a gas-rich extraction section is to supply fresh air due to shaft depression in the air supply and discharge of the outgoing stream through the air-exhaust working and partially in the worked-out space of the previously worked adjacent extraction column.

The difference of the method lies in the fact that in preparation for mining a mining column along the edge of the coal mass after relaxation of the rock pressure in the vicinity of the worked out space, advancing mining face of the mining mining column is carried out by a notch ventilation working parallel to the edge of the coal mass, the prepared column with a breathable coal whole. They create excess pressure in it, ensure the methane-air mixture is diverted from the existing worked-out space to the flank ventilation working due to a shaft depression or an active source of traction. This prevents the flow of methane into the face. An aerodynamically active connection is formed between the subsurface mine and the selected space by means of a fault equal to a stable span of the direct roof, and during the cleaning notch, the methane-air mixture is withdrawn from the mined-out space of the mined excavation column through the maladjustment and through an air-permeable coal pillar formed between the glazed mine and the mined-out space gas suction ventilation unit installed in an intermediate furnace or in a central yrabotke.

You can not use this invention when removing radon from the railway tunnel, since the creation of excess pressure will not ensure the removal of radon from the waste trays.

The closest analogue is the method of ventilation of a dead end metro station [3].

The essence of ventilation is that the movement of air flows is carried out under the influence of a moving electric train and fresh air is supplied to the station's passenger platform through a ventilation shaft. According to the invention, when the electric train approaches the station, the mine’s ventilation valve is closed and all the warm exhaust air is vented into the atmosphere through the lobby, and when the electric train leaves the dead-end station, part of the fresh air is fed to the station’s passenger platform through the ventilation shaft, and part through lobby.

The proposed method will not provide sufficient removal of radon released from the water flowing through the waste trays, due to the weakness of the pressure of the air flows.

The aim of this invention is to provide sufficient pressure force of the air flow to remove radon from the drainage trays of the tunnel.

The essence of the invention lies in the fact that before entering the tunnel on an electric locomotive open the flaps and create an increase in the pressure of the air flows, remove radon from the stagnant zones of the waste trays, mix it in a turbulent air stream and throw it out through the existing ventilation system, and after passing the tunnel the flaps on an electric locomotive cleaned.

The essence of the method for removing radon from a railway tunnel is shown in the drawings.

Figure 1 shows the layout of an electric locomotive with flaps in the tunnel (in cross section).

Figure 2 shows the layout of an electric locomotive with flaps in longitudinal section.

Figure 1 marked:

1 - railway tunnel; 2 - electric locomotive; 3 - flaps; 4 - waste trays.

Figure 2 shows:

1 - railway tunnel; 2 - electric locomotive; 3 - flaps and α - angle of inclination of the flaps.

Water passing through the rocks is enriched with radon, drains into waste trays, and then is released from the water and accumulates above the surface of the water (since radon is heavier than air).

A conventional rail tunnel ventilation system does not have enough pressure to remove radon from trays 3.

The method is as follows.

The driver, before entering the tunnel 1 of the electric locomotive 2, pushes the flaps 3 towards the flaps 3, thereby increasing the air capture area, creating a powerful air stream in front of the electric locomotive 2 along the sewage trays where radon accumulates above the water surface.

The powerful air flow formed with the help of flaps 3 is enhanced by installing the flaps 3 at an angle α = 45-60 °, the air pressure is directed to the lower layers of the tunnel, including trays, pockets, galleries and other stagnant places of the tunnel. The radon raised to the top is mixed with air, and the resulting turbulent flow is sent to the existing ventilation system in tunnel 1.

Before leaving the tunnel 1, the flaps 3 of the electric locomotive 2 are removed.

Conducted experiments on a shunting diesel locomotive showed the efficiency of radon removal.

Information sources

1. RF patent No. 2230910, IPC E21F 7/00; 1/00; filing date 02.10.2005.

2. RF patent №2126889, IPC E21F 1/00; filing date 02/18/1997.

3. RF patent No. 2278268, IPC E21F 1/00; Application submission date 06/23/2004.

Claims (2)

1. The method of removing radon from railway tunnels, including the movement of air flows under the action of a moving electric train, characterized in that before entering the tunnel on an electric locomotive open the flaps and create an increase in the pressure of the air flows, remove radon from the stagnant zones of the waste trays, mix it in a turbulent flow air and thrown out through the existing ventilation system, and after passing through the tunnel, the flaps on the electric locomotive are removed. 2. The method according to claim 1, characterized in that the flaps of the electric locomotive are set at an angle of 45-60 °.

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