Method of metro station ventilation

FIELD: process engineering.

SUBSTANCE: proposed method comprises air flows displacement by moving electric train and feed fresh air to passenger platform by varying air density on said platform. Note here that train is provided with fluid air to be released in air space of metro station equipped with vent shaft. Air with higher density displaces warm dirt air into station vent shaft to replace it by fresh cold air.

EFFECT: fresh air feed in whatever season.

 

The invention relates to the ventilation of underground stations and can be used in the operation of the latter.

The known method of tunnel ventilation, as described in the USSR ā„–1588874 on CL E21F 1/00, 3.30.08.1990,

The known method includes fresh air and exhaust air, which due to the piston effect from a moving train, atmospheric air is sucked into the tunnel through the ventilation shaft, and when the train's departure, the air is pushed out of the tunnel due to the overlapping of the bore of the tunnel.

There is a method allows control of air flow occurring at the station from the reciprocating action of trains and natural draught.

The disadvantages of this method are as follows.

To implement the method requires special expensive device - shutter, which should not create an obstacle to the movement of trains. The shutter must ensure the opening of the bore of the tunnel with high probability, close to 100%. Furthermore, the method does not allow you to change the ratio between the number of warm and cold air it is on a dead-end stations in the cold season, when heat saving mine fans off, and distillation of the ventilation shaft in shallow subways are closed. This op is Adelaide fact, what streams of warm and cold air when using this method, you are moving on the same ventilation system that does not allow for adjustable redistribution of these threads to maintain a comfortable temperature in the lobby and on the passenger platform stations.

The known method of tunnel ventilation, described in the same patent RF ā„–2312222 on CL E21F 1/00, E24F 7/00, Z. 29.06.06, op. 10.12.07.

The known method of tunnel ventilation includes fresh air and exhaust air through the ventilation paths connecting the tunnel with the atmosphere. To create and control the required flow rate change aerodynamic drag in the tunnel by overlapping sections between the train and the wall of the tunnel controllable dampers that are installed on the train.

The disadvantage of this method is the complexity of the design due to the need to install dampers on the train.

There is a method of ventilating a deadlock stations, described in the same patent RF ā„–2278268 on CL E21F 1/00, Z. 23.06.04, 10.01.06. and selected as a prototype.

The known method consists in the following.

The method of ventilation stub subway station includes moving air flows under the influence of a moving train and supply light is its air passenger station platform through the ventilation shaft, when the approach of the train to the station vent valve mines closed and all the warm exhaust air away into the atmosphere through the lobby, creating a negative pressure on the platform due to the "piston effect" when the movement of the departing train that provides suction to the station through the pavilion and lobby fresh cold air, part of which is fed to the platform through the ventilation shaft by opening the vent valve, and the other part through the lobby.

The disadvantage of this method is that its performance capabilities are limited because it is used mainly for ventilation stub subway stations in winter due to the temperature control by opening the vent valve at the approach of a train and closing it when the train's departure.

The goal is to expand the operational capabilities of the method.

The problem is solved in that in the method of ventilation of the underground station, equipped with a ventilation shaft, comprising moving air flows under the influence of moving trains and fresh air to the passenger station platform by changing the density of the air on the platform, ACCORDING to the INVENTION the train supply of liquid air, releasing that at the entrance to the station is the air space of the platform, create a stream of cold compacted fresh air, displacing the contaminated air in the ventilation shaft.

Ensuring trains liquid air in conjunction with the subsequent release of its air space at the station allows the more dense liquid air to displace warm polluted air in the ventilation shaft and to provide the station with fresh cold air.

The technical result - providing station fresh cool air at any time of the year.

The inventive method has the novelty in comparison with the prototype, differing from it in such essential characteristics as the supply trains of liquid air, release it on the platform, creating a compressed air stream, displacing warm polluted air, ensuring collectively achieve the specified result.

The applicant did not know the technical solutions with these distinctive features, which collectively achieve the specified result, he felt, therefore, that the proposed solution meets the criterion of "inventive step".

The inventive method can be widely used in operation metro, and therefore meets the criterion of "industrial applicability".

The inventive method consists in the following.

Train sabaudiae air, which are released into the air space at the stations, equipped with a ventilation shaft. The more dense liquid air displaces warm air pollution station in the ventilation shaft and replaces it with fresh cold air.

The inventive method is carried out, in particular, as follows.

The subway train tack wagon cart with tank in which is liquid air. At the entrance to the station liquid air is sprayed from nozzles behind the train and then the resulting compacted fresh cold air displaces warm air pollution station in the ventilation shaft.

In comparison with the prototype of the proposed method of ventilation metro has a broader operational capabilities.

The method of ventilation of the underground station, equipped with a ventilation shaft, comprising moving air flows under the influence of moving trains and fresh air to the passenger station platform by changing the density of the air on the platform, characterized in that the train supply of liquid air, releasing that at the entrance to the station in the airspace of the platform, create a stream of cold compacted fresh air, displacing the contaminated air in the ventilation shaft.



 

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