Water spray fire extinguishing system refers to the water source, water supply equipment, piping, rainfall valves, filters and water spray nozzles and other components of the system, the fire extinguishing mechanism is when the water in a fine mist of water droplets sprayed onto the surface of the burning material, resulting in a combination of surface cooling, asphyxiation, emulsification and dilution effect, to achieve the extinguishment of the fire, water spray fire extinguishing system is commonly used to fight solid fires and flammable liquid fires with flashpoints higher than 60C. Water spray fire extinguishing system is commonly used to fight solid fires and flammable liquid fires with flash point higher than 60C. The following is the working principle of water spray fire extinguishing system and the scope of application and other related information.

First, the working principle of water spray fire extinguishing system

The working principle of the water spray system is: when the system's fire detector found fire, automatically or manually open the rainfall alarm valve group, at the same time issued a fire alarm signal to the alarm controller, and start the fire pump, through the water supply network to reach the water spray nozzle, water spray nozzle spraying water to extinguish the fire.

Second, the scope of application of water spray fire extinguishing system

Water spray fire extinguishing system according to the purpose of protection is mainly divided into two categories of fire control and protection and cooling, the scope of its application with different protection purposes and set.

(A) the scope of application of fire control and fire suppression

To extinguish and control the fire for the purpose of water spray system is mainly applicable to the following ranges.

1. Solid fire

Water spray system is suitable for fighting solid fires.

2. Combustible liquid fire

Water spray system can be used to fight combustible liquid fires with flash point higher than 60C, such as oil boiler, generator fuel tank, oil pipeline fires.

3.Electrical fires

The centrifugal atomized nozzle of the water spray system sprays water mist with good electrical insulation, so the water spray system can be used to extinguish oil-immersed power transformers, cable tunnels, cable trenches, cable shafts, cable mezzanine and other electrical fires.

(B) the scope of application of protective cooling

Water spray system for the purpose of protective cooling is mainly applicable to the following scope.

1. Protective cooling for production, storage, loading and unloading, and use of facilities and installations of combustible gases and liquids of A, B and C categories.

2. Cooling protection of chemical installations and pipelines with high fire risk, such as heaters, reactors, distillation towers, etc.

Third, the water spray fire extinguishing system set place

According to the application, water spray system can be set up in different places and parts.

(A) fixed water spray fire extinguishing system

Fixed water spray fire extinguishing system can be set up in the following places.

1. building oil, gas boiler room, oil-fired oil-immersed power transformer room, oil-filled high-voltage capacitors and oil-filled switch room, self-supplied generator room;.

2. Single capacity of 40MWR above the oil-fired oil-immersed power transformers in factories and mines, single capacity of 90MWfe above the oil-fired oil-immersed power transformers, single capacity of 125MW& above the oil-fired oil-immersed power transformers in independent substations.

(B) automatic water spray a water spray hybrid configuration system

Automatic sprinkler a water spray mixed configuration system for water consumption is relatively small, the protection object is relatively single indoor places, such as building indoor oil, gas boiler room, etc.. For the setting of automatic sprinkler system building, in order to reduce the cost of the project, can be automatic sprinkler system water distribution pipe or water distribution pipe as a local place within the building application of automatic sprinkler water spray mixed configuration system of water supply pipe.

(C) foam-water spray system

Foam - water spray combined system applies to the use of foam fire than the use of water fire extinguishing effect is good.

Fourth, the water spray fire extinguishing system does not apply to the scope of

(A) unsuitable for water extinguishing substances

Peroxide, such as potassium peroxide, sodium peroxide, barium peroxide, magnesium peroxide and so on. This kind of material will be violently decomposed when it meets water, releasing reaction heat and generating oxygen. When in contact with certain organic materials, flammable materials, combustible materials, light metals and their salts can cause violent decomposition reaction, due to the reaction rate is too fast may cause an explosion or combustion.

2.Combustible substances in contact with water

Metal potassium, metal sodium, calcium carbide (calcium carbide), aluminum carbide, sodium carbide, potassium carbide and so on. These substances in contact with water can make water decomposition, capture the oxygen in the water and its compounds, and release heat and produce flammable gases resulting in combustion or explosion of the evil.

(B) the use of water spray will cause an explosion or destruction of the place

1. High-temperature closed containers or space

When the water mist sprayed, due to the rapid vaporization of water mist so that the container or space pressure rises sharply, resulting in damage or the risk of explosion.

2. surface temperature is often in a high temperature state of combustible liquids

When the water spray to the surface of the combustible liquid will cause splashing, resulting in the spread of fire.

Five, water spray fire extinguishing system classification

1, according to the application is divided into full flooding system and local application system.

2, according to the action is divided into open system and closed system (wet, dry and pre-action three forms).

3、According to the atomization medium is divided into single-fluid and dual-fluid system.

4, according to the water supply is divided into pump group system, bottle group system and bottle group pump group combined system.