Powder Automatic Fire Extinguishing Device for Cable Tunnel

Background and Necessity to Install Automatic Fire Extinguishing Device in Cable Tunnel

The cable tunnel is the main lifeline for the entry power plant to operate, the cable is hot during its operation, and after running at high temperatures for a long time, it is easy to make cable insulation age and damage, so that a fire occurs.

There are no fire protection measures installed in some cable tunnels, so can not effectively control the initial fire of the cable, not have cable protection functions.

Some cable tunnels are very long but narrow, and many turn over there, so it is inconvenient for maintenance and handling of emergency incidents.

To ensure the normal operation of the equipment, and to Avoid cable tunnel fire accidents, it is suggested to install an automatic fire extinguishing device in the cable tunnel, that effectively controls the initial fire in the cable tunnel and protects the safety of the cable, and prevent accident happen and avoid from causing economic losses, safeguarding the safety and stability of power plant.

Setting and Model Selection Principle for Automatic Fire Prevention Device Inside Cable Tunnel

• The product should be a new generation of fire protection products with high efficiency and should be environmentally friendly.
• Can be widely used in cable tunnels, cable inter-layers, computer rooms, generator rooms, high and low-voltage distribution/substation rooms, communication databases, etc should be Fire protection in industrial and civil construction/buildings.
• Should meet the requirement of high fire extinguishing efficiency and low fire extinguishing concentration, should suppress fire very rapidly.
• Products should have performance of environmentally friendly, toxic-free, and safe; no irritation to human skin and respiratory tract; no corrosion to the protected object.
• Should have characteristics of low noise and long duration in fire suppression, should not cause secondary damage to the protected object and the building, when multiple devices are linked; and the jet force should be strong.

Application Characteristics of Super-fine Powder Automatic Fire Protection Device Installed in Cable Tunnels

• Easy to install and use, it is unaffected by buildings and protected objects during installation, no need to install a large number of pipes and ancillary facilities.
• Quickly to start and reliable in performance, the device uses scientific technology to extinguish fires, there are 3 activation modes to start the device and suppress fire: Temperature thermo activation, thermal activation, and electric activation; to achieve the purpose of early detection of fire, early fire suppression; then effectively reduce the damage caused by fire.
• Can be used individually, and can also be used in multiple linkages; Forming a pipe-less network fire extinguishing system; and fighting fires with large protection spaces or protected areas.

Fire Extinguishing Principle of Super-fine Dry Powder Automatic Fire Suppression Device

Asphyxia and cooling down, heat isolation and suppression of the chemical action of flaming combustion are the basic fire extinguishing principles of ultra-fine dry powder automatic fire extinguishing devices.

Basic Procedures

• suppress the chemical action of flaming combustion: Combustion process is a chain reaction process, OH and H radicals are key free radicals that sustain combustion chain reactions, they are very energetic and very lively, but life span is short, and once generated, immediately trigger the next reaction, to generate more free radicals, to allow the combustion process to continue and expand; The fire extinguishing component of dry powder fire extinguishing agent is a burning inactive substance, when the dry powder fire extinguishing agent is added to the combustion zone and mixed with the flame, when the dry powder is in contact with the free radical of the flame, Superfine powder fire extinguishing component quickly captures combustion radicals OH and H, when a large amount of powder is sprayed into the flame in the form of a mist, make the free radicals in the flame to be consumed faster than the rate at which they are generated, the number of burning free radicals is drastically reduced, causing the combustion chain reaction to be interrupted, finally extinguish the fire flame.
•  HEAT ISOLATION: The sprinkled superfine dry powder is melted when it comes into contact with the surface of the ablated object, causing a series of chemical reactions, forming a glassy cover layer, Isolating the combustion from the air, Making burning suffocation; when the powder covers a certain thickness, it can also play a role in preventing re-ignition.
•  Asphyxia and cool down: The powder will release crystal water or decompose at high temperatures., these are all endothermic reactions, the generated active gas can dilute the oxygen concentration in the combustion zone, therefore getting the function of asphyxia and cool down.

Conclusion

• After consulting relevant specifications, it is ideal to choose a suspension-type superfine dry powder automatic fire extinguishing device in cable tunnels, that can meet the requirement of cable tunnels’ fire protection and could connected to the fire alarm controller through fire control device, achieve function of automatic fire suppression in cable tunnels locations.
• suspension type superfine dry powder automatic fire extinguishing device can be installed independently on the top ceiling of the cable tunnel, it is space-saving and very easy to use; can according to the status of cable tunnels, Flexible layout of the installation locations and selection size, meet the fire protection requirement for cable tunnel and cable trench.
• suspension type superfine dry powder automatic fire extinguishing device is a store extinguishing agent without pressure, and no need to worry about vibration.