Water mist fire extinguishing technology is a more suitable fire extinguishing technology for subway tunnels. When the subway encounters fire accidents, the fire often spreads rapidly in the narrow tunnel, posing a great threat to people's lives and property. Traditional fire suppression methods are not suitable in subway tunnels, so new technologies are needed to solve this problem. Its application will be described in detail below.
 

Principle of water mist fire extinguishing technology

 
Water mist fire extinguishing technology is the use of high pressure pump to compress water to tens of mpa of high pressure, the water is sprayed to form tiny water droplets, the formation of fog-like substances in the air, because of the large area of the fog material, strong heat dissipation ability, can quickly reduce the temperature in the burning area, so as to extinguish the fire source.
 
Application of water mist fire extinguishing technology in subway tunnel
 
Water mist fire extinguishing technology has certain particularity, it is suitable for fire extinguishing in subway tunnel. Compared with traditional fire extinguishing technology, water mist fire extinguishing technology has the following advantages:
 

efficient

 
Once the fire in the subway tunnel occurs, the fire often spreads quickly, if not put out in time, the consequences will be unimaginable. Water mist fire extinguishing technology can quickly spray a large number of mist water droplets, covering a wide area, can quickly reduce the temperature in the burning area, so that the fire can be controlled.
 

secure

 
The oxygen content of the air in the subway tunnel is relatively low, and the fire source is easy to cause an explosion, and the use of traditional fire extinguishing technology will consume too much oxygen, resulting in a secondary explosion. The water mist emitted by the water mist fire extinguishing technology can effectively prevent the oxygen in the air from entering the fire area and reduce the risk of secondary explosions.
 
Environmental protection
 
Subway tunnel is a closed space, the traditional fire extinguishing method may produce a lot of harmful gases such as carbon dioxide in the fire extinguishing process, causing pollution to the environment. The water mist emitted by the water mist extinguishing technology is pure water and will not cause pollution to the environment.