RU2342534C2 - Method and facility for withdrawal of radon out of railway tunnel - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: group of inventions pertains to method and facility for withdrawal of radon out of railway tunnel. According to the method a stream of air generated by train motion is directed into operating ventilation system. By means of cutting-off doors part of air flow is directed to a joining connected with a prospecting transport-draining gallery wherefrom the air flow is coming back into the tunnel via another joining owing to sucking "piston effect" created after train passing. The facility consists of heat-ventilation system including joining with the tunnel. The facility also is equipped with the cutting-off door into the joining; the said door is made in its lower part of two similar halves in the middle connected with a pivot designed to turn at angle of 110-130° at train passing and designed to pressure-tight close after train passing.

EFFECT: facilitates turbulisation of lower layers of air in tunnel to catch radon and to withdraw it into operating ventilation system.

2 cl, 2 dwg

Description

The invention relates to a method for removing radon from long-distance railway tunnels.

A known method of artificial ventilation of deep quarries with convective air flows (1). Its essence lies in the fact that in the quarry space of the ventilation stream, a ventilation stream is created by the directed action of installations generating free jets. The flow control and maintenance of the range required for the removal of contaminated air beyond the quarry of the air-emitting stream, while the speed and direction of the ventilation flow are controlled by floating inflatable barriers placed in the airspace of the quarry.

Barriers are held and controlled from the ground by ropes by means of mobile winches. The necessary range of the air-jet is supported by the creation of an upward convective air flow from the heated surface of the inflatable fence.

This method is not applicable to remove radon from a railway tunnel. In tunnels do not place inflatable barriers, and therefore, it is impossible to create ventilation flows.

There is also known a method of ventilation of a mine (2), which includes supplying air to the mine ventilation network in normal and reverse directions.

The purpose of the proposed method of ventilation is to provide the necessary air distribution when switching to the reverse direction of the air stream, taking into account emergency situations or people leaving the mine.

This goal is achieved by the fact that in the ventilation network install jumpers that allow air to pass in the normal direction and limit its passage in the reverse direction. Due to this, the passage of air through one of the mine workings is limited and is enhanced by the redistribution of others.

Using this method to remove radon from a railway tunnel is difficult and expensive, especially with a long tunnel length.

The closest analogue is the invention "Method of tunnel ventilation (3).

The aim of this invention is to increase the ventilation efficiency of a long tunnel by reducing energy consumption and increasing the amount of fresh air supplied to the tunnel.

To do this, pass the ventilation shaft, connect it to the tunnel. Before or after the train enters the entrance portal, the passage section of the tunnel in the section between the portal and the ventilation shaft is blocked. Exhaust air is vented through the ventilation shaft.

When the train approaches the ventilation shaft, the passage section of the tunnel in this section is opened and it is blocked in the section between the ventilation shaft and the entrance portal. At the same time, fresh air is supplied through the ventilation shaft. After that, the passage section in this section is reopened. That is, the use of the piston effect from trains moving in the tunnel increases the efficiency of the ventilation system.

This invention allows to improve the ventilation of the air in the tunnel, and in particular in railway tunnels of particularly long lengths where radon is accumulated below, this ventilation is clearly not enough.

The purpose of this method is to remove radon from the tunnel by creating turbulent air currents that trap radon and are emitted into the atmosphere in a place with a common air stream.

The goal is achieved in that the method of removing radon from the tunnel, according to which a stream of air formed by the movement of the train, is sent to the existing ventilation system, characterized in that part of the air flow using the shut-off doors is sent to the fault associated with the exploratory transport and drainage adit, from which the air flow is again returned to the tunnel for another failure due to the suction effect of the “piston” formed after the train passed, thus ensuring the turbulence of the lower layers of air to match barely grip of radon and its removal in the existing ventilation system.

A device for removing radon from a tunnel, comprising a heat ventilation system, including a failure with a tunnel, characterized in that it is equipped with a shut-off door in a failure, made in the lower part of two identical halves, hinged in the middle between them and rotated by an angle of 110-130 ° when passing the train and with the possibility of tight closure after passing the train.

The invention is illustrated by drawings.

Figure 1 - General plan of the tunnel and exploratory transport and drainage adit.

In Fig.2 - the location of the door-cutter in a failure.

Figure 1 shows the tunnel 1, exploratory transport and drainage adit 2, fault 3, train 4, portals of the tunnel A and B.

Figure 2 shows the door-cutter 5 in the fault 3 and the hinge 6.

The method is as follows.

To create turbulent air flows formed by the movement of the train 4 in the tunnel 1, a door-cutter 5 of the air flows is used.

A feature of this process is the installation of shut-off doors 5 that work when the train 4 moves in two different directions.

At the same time, the shut-off door 5 is a sash of metal doors that close the entrance to the fault 3.

The shut-off door 5 for fault 3 is made of two identical halves connected in the middle by a hinge 6, which is located in the recess of the rack 3. The halves, depending on the conditions, can be rotated through an angle of 110-130 °.

When the train 4 moves in the tunnel 1, a powerful stream of compressed air is formed in front of it, which moves in front of the train 4.

Using the shut-off doors 5, part of the air flow is sent to the fault 3 of the exploratory transport and drainage adit (RTDSH).

The air flow moving along the RTDS, after passing the train 4, returns again through another fault 3 to the tunnel 1. This is facilitated by the fact that after the passage of the train 4, a rarefied space forms, which creates a suction effect, and the air from the RTDS again returns to tunnel 1.

The air flow thus formed creates turbulence of the lower layers of air in the tunnel 1 and intensive mixing of the gaseous components.

The heavy gas (radon) located in the lower layers of air in the tunnel 1, due to turbulence, is mixed with the air flow generated by the movement of the train 4, and is ejected through the exhaust system.

After passing the train 4, the shut-off door 5 tightly closes the entrance to the fault 3.

Studies in model experiments, in particular at the Severo-Muisky tunnel, showed a rather high efficiency of radon removal from the railway tunnel, even when passing several trains per day.

Literature

1. Patent RU No. 2172839, IPC E21F 1/00, priority date 05/06/2000.

2. Patent RU №2124130, IPC E21F 1/00, priority date 05/13/1997

3. Auth. testimonial. SU No. 1588874, IPC E21F 1/00, priority date 08/01/1988

Claims (2)

1. The method of removing radon from the tunnel, according to which a stream of air formed by the movement of the train is sent to the existing ventilation system, characterized in that part of the air stream using the shut-off doors is sent to the fault associated with the exploratory transport and drainage tunnel, from which the stream the air is again returned to the tunnel for another failure, due to the suction effect of the “piston” formed after the train passed, thus ensuring the turbulization of the lower layers of air in the tunnel to capture radon and its removal into the existing ventilation system. 2. A device for removing radon from a tunnel, comprising a heat ventilation system, including a failure with a tunnel, characterized in that it is equipped with a shut-off door in a failure, made in the lower part of the same halves connected in the middle by a hinge with the possibility of rotation through an angle of 110- 130 ° when passing the train and with the possibility of tight closure after passing the train.

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