What are the main features of metro environmental control? 5

The distributed computer automation management and control system (BAS) of subway environmental control (hereinafter referred to as: environmental control system) is an automatic control system based on the theory of modern computer and network technology combined with mechanical and electrical equipment automation control principle, and the control object of the system is mainly subway ventilation and air conditioning equipment, water supply and drainage equipment, normal lighting equipment and escalator equipment. Its main features: for such a large-scale and very important underground facilities of the subway, its environmental conditions and the air above ground are relatively closed, and the passenger flow is very concentrated, if there is no complete and reliable automatic control system to monitor and control the environmental quality in the subway on such an important occasion, so that it can meet the requirements of passenger comfort under normal circumstances, and provide correct and reliable information to ensure the safety of passengers in an emergency, the consequences will be very serious.

Because the ventilation and air-conditioning system of the subway project is completely different from the general above-ground building, the change of temperature and humidity has both its periodicity, and also because of the random change irregularity of the external interference, the ventilation and air-conditioning system has a large capacity and complex, in this case, if there is no computer control system, it is impossible to achieve only the artificial control of the staff.

The subway underground line is a long and narrow underground building, and it can be considered that the subway is basically isolated from the atmosphere, except for the entrances and exits of each station and the ventilation channel to communicate with the atmosphere. Because the train operation, equipment operation and passengers will emit a lot of heat, the subway environment has the following characteristics: the train runs with a life congestion effect, which is easy to interfere with the airflow organization of the station, and if it cannot be used reasonably, it will affect the load of the station; A large amount of heat is generated during the operation of the train and is brought into the station; The stratum has a heat storage effect, and the temperature inside the subway system will increase year by year with the increase of operation time. When a fire accident occurs, it will lead to environmental degradation and it is not easy to rescue.

The two characteristics of the metro system are fast operation, large carrying capacity and low energy consumption, and low environmental impact; Moreover, the subway system promotes the accelerated development of urban industries and economies, and also guides the development of urban spatial structure.

The subway system is a kind of urban rail transit, it is a large-volume rail transportation system, using steel wheel rail system, the standard gauge is 1435mm, mainly in the underground space of large cities to build tunnels.

It is a high-volume rail transportation systemsystemThe standard gauge is 1435mm, which is mainly used in the tunnels built in the underground space of large cities, and when conditions permit, it can also penetrate the ground and run on the ground or viaducts.

According to the different models selected, it can be divided into conventional subway and small section subway; According to the different scales, it can be divided into high-volume subways and large-capacity subways.

Base model. The basic models of subway vehicles are A-type cars, B-type cars and LB cars (linear motors), and the basic width of A-type vehicles is 3000mm; The basic width of the B-type and LB vehicles is 2800mm. Each vehicle type has a distinction between a driver's cab and a driver's cab, a motor vehicle and a trailer.

Technical standards. The train marshalling of the metro system usually consists of 4 8 cars, the length of the train is 70 190m, the line is required to have a long platform to match, and the maximum travel speed should not be less than 80km h.

The subway sign system is a service facility system that uses text, graphics and color as the basic elements to provide instructions, prompts and warnings to subway passengers through visual communication. It plays a key role in the reasonable organization and orderly evacuation of passengers in subway stations, and is an important guarantee for the normal operation of the subway and the smooth ride of passengers.

As an important part of the city's comprehensive three-dimensional transportation system, the subway is also an important symbol of the city's modernization level. The information release system can display all information such as travel instructions, service hours, train arrival and departure times, train schedules, manager announcements, announcements, travel references, real-time weather forecasts, news, advertising information, etc. From the perspective of the commercial display industry, the subway is also a place with high requirements for intelligent informatization, and the information release system will further promote the digital transformation and high-quality development of China's rail transit industry, and provide assistance for the construction of a transportation power.

1. Land saving:

Due to the high value of urban land in large cities, the construction of railways underground can save ground space and allow the ground land to be used for other purposes.

2. Reduce noise:

The railway is built underground, which reduces the noise on the ground.

3. Reduce interference:

Because the route of the subway does not overlap or intersect with other transportation systems (such as at-grade roads), the traffic is subject to less traffic interference, which can save a lot of commuting time.

4. Energy saving:

Under the problem of global warming, the subway is the best means of public transportation. Due to the stable speed of the subway, it saves a lot of commuting time, makes people happy to ride, and also replaces a lot of energy consumed by driving.

5. Reduce pollution

The average car uses gasoline or oil as an energy source, while the subway uses electric energy, which has no exhaust emissions and does not pollute the environment.

The subway environmental control system provides a comfortable riding and working environment for passengers and staff by controlling the organic operation of tunnel fans, air conditioning, water supply and drainage and lighting subsystems, and Fast Retailing provides a suitable operating environment for the cavity subway related equipment.

During the operation of the subway, the environmental control system can eliminate the damp heat in the working space of Mu Yuanyou to ensure a comfortable environment for personnel and equipment;

When the train stays in the tunnel section due to blockage, the environmental control system can provide fresh air to the tunnel to maintain the necessary environmental conditions for passengers in a short time;

In the event of a fire or leakage of toxic gases, the environmental control system can discharge toxic and harmful substances in time through smoke exhaust to avoid injury to passengers to the greatest extent. The functions of the environmental control system can be summarized as: "providing a comfortable environment, water supply and sewage, providing electricity, disaster prevention and relief", etc.