Ventilation system for blocking pollutant diffusion of subway transfer station

Abstract

The invention discloses a ventilation system for blocking pollutant diffusion of a subway transfer station, which comprises the following steps: when pollutant leakage occurs in a transfer channel of the subway transfer station, a sensor in a certain subarea firstly senses the existence of pollutants, a signal is transmitted to air curtains and a ventilation system, the air curtains at two ends of the area are started, and the ventilation system is started; and all air-conditioning ventilation systems in the station are closed, pollutants in the area are blocked by using an air curtain air supply and exhaust system, and the exhaust system in the area is started to form negative pressure, so that the pollutants are prevented from diffusing to other areas. When the sensor detects that pollutants exist in other areas, the air curtain systems at the two ends of the two areas are started, air supply of the air curtain between the two subareas is stopped, only ground air exhaust is started, and the air exhaust systems in the two areas are started at the same time. The invention aims to effectively control pollutants in an area where a source is located to facilitate subsequent centralized treatment, and aims to facilitate personnel to quickly leave the polluted area through flexible obstruction formed by the air curtain when the pollutants leak.

Description

Technical Field

[0001] The invention relates to the technical field of anti-pollutant blocking in rail transit, and in particular to a ventilation system for blocking the diffusion of pollutants in a subway transfer station. Background Art

[0002] As an important public transportation facility, the subway is characterized by high population density, large passenger flow, and confined space. Once pollutant leakage occurs, it will cause huge losses. With the continuous development of urban rail transit, subway lines have expanded significantly, and the number of transfer stations has gradually increased. For transfer stations located at transportation hubs, the internal space is large, and some transfer passages are long and single, and the escape routes are also subject to certain restrictions. Therefore, technical measures for blocking pollutants in this area need further research.

[0003] Once an accidental leakage of pollutants occurs in a subway station, it is very difficult to evacuate personnel and handle rescue operations, which can easily cause heavy casualties. Once pollutants enter the air-conditioning ducts, they will spread to various areas under the transportation of the ducts, causing serious consequences. In addition, the existing fire shutters in subway stations, as a rigid barrier, have certain limitations on the evacuation of personnel, and the smoke barrier walls only have a good blocking effect on gases such as smoke whose density is less than that of air, but cannot prevent the spread of heavy gases. The existing blocking measures have certain defects. In the event of an emergency, the usual practice is to shut down the air-conditioning system as soon as possible, so that it is not fully utilized. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and provide a ventilation system for blocking the diffusion of pollutants in subway transfer stations. When pollutant leakage occurs in the transfer passage area of ​​the subway transfer station, this method can effectively control the diffusion of pollutants and protect the health and life safety of indoor personnel.

[0005] The technical solution of the present invention is as follows: for large-scale subway transfer stations, the transfer passage is divided into several areas, and each area is divided by a group of air curtain systems as flexible barriers. When pollutant leakage occurs, the pollutants can be controlled in the partition where the source is located; wherein the air curtain equipment is a blowing and suction air curtain; wherein the air curtain equipment is arranged inside the ceiling and on the ground, and sensors are installed in each partition. Once a certain concentration of pollutants is detected, the signal can be transmitted to the air curtain and the ventilation and air-conditioning system.

[0006] The method specifically comprises the following steps:

[0007] 1) When pollutants leak in the subway transfer channel, the sensor in a certain zone first senses the presence of pollutants and transmits the signal to the air curtain system, and activates the air curtain between the zone and other zones. The air supply and exhaust systems of the air curtain are used to block the pollutants in the zone, and the air supply and return air of the ventilation and air conditioning system are shut down at the same time;

[0008] 2) If pollutants are also sensed in other partitions, that is, the pollutants are at the boundary of the partitions and the diffusion range has covered two partitions, then the air curtain systems at both ends of the area where the pollutants are sensed are turned on. For the air curtain between the two partitions where the pollutants are sensed, the air supply is turned off, only the ground exhaust is turned on, and the exhaust systems in these two areas are turned on to form a negative pressure area;

[0009] 3) If no pollutants are sensed in other zones, that is, the source of the pollutant leakage is located in the middle of the zone and is only spreading in this zone and has not spread to other zones, then the exhaust system in this zone is turned on to form a negative pressure zone to prevent it from spreading to other zones and control it at the source;

[0010] 4) After a period of time, when sensors in other partitions detect pollutants, it means that the pollutants have broken through the barrier of the air curtain and spread to other areas. At this time, the air curtains at both ends of the affected area are opened, and the exhaust in the newly sensed pollutant area is closed to prevent the pollutants from affecting other areas;

[0011] 5) After all personnel in the station have evacuated to a safe area, professional personnel will carry out centralized treatment of the pollutants.

[0012] Furthermore, the subway station is an underground transfer station, including at least two subway lines and a long transfer passage, and there is no entrance or exit in the transfer passage, an air curtain system is provided between the areas as a flexible barrier, and there is at least one pollutant sensor in each area.

[0013] Furthermore, the blowing and suction air curtain used to divide the area includes top air supply and ground exhaust. The air supply outlet is located at the ceiling and is connected to the air supply duct in the station. The valve of the air curtain air supply duct is closed under normal operation; the air exhaust outlet is located at the bottom area on the ground or both sides of the wall. The specific form should be set accordingly according to the air duct layout. The air curtain supply and exhaust are only opened in an emergency.

[0014] Furthermore, the air curtain is in a closed state in non-emergency situations. Only when the sensor senses a certain concentration of pollutants, the air curtain enters an operating state, forming an air curtain from top to bottom to block the pollutants from spreading to other areas. At the same time, as a flexible barrier, it is conducive to the escape of personnel, making up for the defect that rigid barriers are not conducive to escape and evacuation.

[0015] The beneficial effects of this method are as follows: when pollutants leak in the transfer channel of a subway transfer station, the sensor in a certain partition first senses the presence of pollutants, transmits the signal to the air curtain and ventilation system, starts the air curtains at both ends of the area, and shuts down all air conditioning and ventilation systems in the station. The air curtain air supply and exhaust systems are used to block pollutants in the area, and the exhaust system in the area is turned on to form a negative pressure to prevent pollutants from spreading to other areas. When the sensor detects the presence of pollutants in other areas, the air curtain systems at both ends of the two areas are turned on, and for the air curtain between the two partitions, the air supply is turned off, and only the ground exhaust is turned on, and the exhaust systems in the two areas are turned on at the same time.

[0016] The present invention proposes a ventilation system for blocking the spread of pollutants in subway transfer stations. The first goal is to effectively control pollutants in the area where the source is located to facilitate subsequent centralized treatment. The second goal is to form a flexible barrier by the air curtain when pollutants leak, so that people can quickly leave the polluted area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the present invention along the length direction of the transfer channel

[0018] Figure 2 The operation strategy flow chart of the ventilation system of the present invention is DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments of the present invention include but are not limited to the following embodiments.

[0020] The purpose of this embodiment is to provide a ventilation system to block the spread of pollutants in subway transfer stations. Figure 1 As shown, the transfer passage of the underground transfer station is divided into three areas, each area has air supply and exhaust vents, air supply and exhaust can be carried out in the area, and there is at least one pollutant sensor in each area, and blowing and suction air curtains are installed between the areas.

[0021] Specifically, the blowing and suction air curtain includes an air supply port and an air exhaust port. The air supply port is located at the top of the transfer passage and can be connected to the ventilation and air conditioning ducts; the air exhaust port is located at the bottom area on the ground or on both sides of the wall. The specific form should be set accordingly according to the air duct layout. When the sensor in area 2 senses the presence of pollutants, the air curtains at both ends of area 2 open to supply and exhaust air, and introduce outdoor fresh air through the supply air. The exhaust port forms an air curtain at the ground together with the supply air, which provides a flexible barrier, does not hinder the escape of personnel, and can block the spread of pollutants. The air supply and exhaust of the air curtain are only opened in an emergency, and the valves of the air curtain supply duct are closed under normal operation.

[0022] For the subway station ventilation and air-conditioning system, air can be supplied and exhausted inside the subway station. When the sensors in the public areas of the station sense a certain concentration of pollutants, the signals are transmitted to the ventilation system and the air curtain system, the ventilation and air-conditioning system is shut down, and the air curtains at both ends of the sensing area and the exhaust system in the non-sensing area are turned on; when the pollutants break through the barrier of the air curtain and spread to other areas, the air curtains at both ends of the newly infected area are opened, the internal air supply is shut down, and the air supply of the air curtain systems in the two areas is shut down.

[0023] The present invention is a ventilation system for blocking the diffusion of pollutants in a subway transfer station. Figure 2 As shown, taking the pollutant leakage in the middle of area 2 as an example, the specific steps include:

[0024] 1) The sensor in area 2 senses the pollutants and transmits the signal to the air curtains at both ends of this area, turning on the air supply and exhaust of the air curtains to form air curtains, blocking the spread of pollutants to areas 1 and 3.

[0025] 2) Since the source of pollutant leakage is located in the middle of area 2, the pollutants will not spread to area 1 and area 3 in a short time. Due to the obstruction of the air curtain, area 1 and area 3 will not sense the pollutants for a certain period of time. At this time, all exhaust vents in area 2 are opened to form a negative pressure in area 2. At the same time, the air supply vents in area 1 and area 3 are opened to replenish fresh air and reduce the concentration of pollutants.

[0026] 3) After a period of time, if the pollutants break through the barrier of the air curtain, it means that the pollutant concentration in area 2 is high at this time. Assuming that the sensor in area 1 senses the pollutants at this time, the personnel in area 2 should evacuate to area 3 in time. At this time, the sensor in area 1 transmits the signal to the ventilation system, shuts down the air supply in area 1, and shuts down the air supply of the air curtain between area 1 and area 2, and opens the air curtain at the other end of area 1 and the exhaust inside area 1.

[0027] 4) After all personnel in the station have been evacuated, professional personnel will carry out centralized treatment of the pollutants.

[0028] The above embodiments are only for illustrating the implementation process and features of the present invention, but the present invention is not limited to the above specific implementation modes, which are only illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art can make many forms of specific changes without departing from the scope of protection of the present invention and the claims, all of which belong to the protection scope of the present invention.

Claims

1. A ventilation system for blocking the diffusion of pollutants in a subway transfer station, characterized in that: For large-scale subway transfer stations, the transfer passage is divided into several areas, and each area is divided by a group of air curtain systems as flexible barriers. When pollutant leakage occurs, the pollutants can be controlled in the area where the source is located; the air curtain equipment is a blowing and suction air power; the air curtain equipment is arranged inside the ceiling and on the ground, and sensors are installed in each area. Once a certain concentration of pollutants is detected, the signal can be transmitted to the air curtain and ventilation and air-conditioning system. The method specifically comprises the following steps: 1) When pollutant leakage occurs in the subway transfer channel, the sensor in a certain partition first senses the presence of the factor and transmits the signal to the air curtain system, and activates the air curtain between the partition and other partitions, using the air supply and exhaust system of the air curtain to block the pollutants in the partition, and at the same time shuts down the air supply and return air of the ventilation and air conditioning system; 2) If pollutants are also sensed in other partitions, that is, the pollutants are at the boundary of the partitions and the diffusion range has covered two partitions, then the air curtain systems at both ends of the area where the pollutants are sensed are turned on. For the air curtain between the two partitions where the pollutants are sensed, the air supply is turned off, only the ground exhaust is turned on, and the exhaust systems in these two areas are turned on to form a negative pressure area; 3) If no pollutants are sensed in other zones, that is, the source of the pollutant leakage is located in the middle of the zone and is only spreading in this zone and has not spread to other zones, then the exhaust system in this zone is turned on to form a negative pressure zone to prevent it from spreading to other zones and control it at the source; 4) After a period of time, when sensors in other partitions detect pollutants, it means that the pollutants have broken through the barrier of the air curtain and spread to other areas. At this time, the air curtains at both ends of the affected area are opened, and the exhaust in the newly sensed pollutant area is closed to prevent the pollutants from affecting other areas; 5) After all personnel in the station have evacuated to a safe area, professional personnel will carry out centralized treatment of the pollutants.

2. A ventilation system for blocking the diffusion of pollutants in a subway transfer station according to claim 1, characterized in that: The subway station is an underground transfer station, including at least two subway lines and a long transfer passage with no entrance or exit. An air curtain system is provided between areas as a flexible barrier, and each area has at least one pollutant sensor.

3. A ventilation system for blocking the spread of pollutants in a subway transfer station according to claim 1, characterized in that: The blowing and suction air curtain between areas includes top air supply and ground exhaust. The air supply outlet is located at the ceiling and connected to the air supply duct in the station. The valve of the air curtain air supply duct is closed under normal operation; the air exhaust outlet is located at the bottom area on the ground or both sides of the wall. The specific form should be set according to the air duct layout. The air curtain supply and exhaust are only opened in an emergency.

4. A ventilation system for blocking the spread of pollutants in a subway transfer station according to claim 1, characterized in that: When pollutants leak, the partition that first senses the presence of the factor opens the air curtains at both ends to prevent it from spreading to other areas. If other partitions sense the factor at the same time, it means that the source of the factor leakage is near the intersection of the two areas. At this time, the air curtains at both ends of the two partitions need to be opened, and the air supply of the air curtains inside the two partitions needs to be closed. Only the exhaust air is turned on, and the air conditioning exhaust in the two areas is turned on, and the return air should be turned off at this time to prevent the factor from spreading to more areas. If other partitions do not sense the pollutants, it means that the source of the factor leakage is in the middle of this area. At this time, the air curtains at both ends of this area and the air conditioning exhaust in this area need to be opened to form a negative pressure area.

5. A ventilation system for blocking the spread of pollutants in a subway transfer station according to claim 1, characterized in that: In non-emergency situations, the air curtain is in a closed state. Only when the sensor senses a certain concentration of pollutants, the air curtain enters the operating state, forming an air curtain from top to bottom to block the spread of pollutants to other areas. At the same time, as a flexible barrier, it is conducive to the escape of personnel, making up for the defect that rigid barriers are not conducive to escape and evacuation.

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