Dry Powder System Ultra-Fine Brief Introduction

The Ultra-fine ABC dry chemical Extinguisher belongs to one of the four major fire extinguishing systems in the world.

At present, it is widely used in pipe galleries, paint rooms, and oil storage rooms.

In particular, it has a good effect on fire in narrow spaces or in places where flammable liquids are stored, Many people do not know how much about it, today we will focus on its concept, performance characteristics, etc.

SUPER-FINE DRY POWDER FIRE EXTINGUISHING AGENT

It is divided into BC and ABC classes, in the market the ABC style is the main chemical, The main chemical components are: ammonium phosphate, ammonium polyphosphate, sodium bicarbonate, sodium chloride, potassium chloride, and so on.

By total flooding fire test, shows that: when the particle size of the dry powder extinguishing agent is less than 5 μm, the fire extinguishing efficiency has risen sharply, The fire extinguishing effect is 6 to 10 times that of ordinary dry powder fire extinguishing agent, the amount of dry powder is also significantly reduced, which is several tenths or even only a few percent of the amount of conventional dry powder compound.

FIRE EXTINGUISHING PRINCIPLE

The principle is the combination of chemical fire extinguishing and physical fire suppression, and chemical fire extinguishing plays a major role.

Chemical suppression of flaming combustion, suffocation, cooling, and heat radiation, It physically isolates the protected object from the air, blocks the oxygen required for re-combustion, and physically prevents re-combustion.

ADSORPTION AND INHIBITION OF FLAMING COMBUSTION

The flaming combustion of substances is carried out through a chain reaction, to stop the chain reaction of combustion.

It is necessary to effectively inhibit the generation of free radicals or rapidly reduce the concentration of H, OH, O, and other free radicals in the flame, then the combustion will be stopped.

ABC super-fine dry powder fire extinguishing agent is based on chemical adsorption and inhibition.

In the process of fire extinguishing, the particles M of super-fine dry powder fire extinguishing agent contact with the active radicals “oh” and “h” in the flame and instantly adsorb them on their surface.

The reaction causes the active “oh” and “h” to combine on the particle surface to form inactive water and gas. With the adsorption and combination of particles, the free radicals “h” and “oh” in the flame can be combined.

When a large number of particles are sprayed on the flame in the form of mist, a large number of free radicals in the flame are absorbed, so that their number is sharply reduced, the chain reaction of combustion is interrupted, and the flame is extinguished.

The fire extinguishing effect of ultra-fine dry powder fire extinguishing agent particles is called “chemical inhibition or adsorption”.

The fire extinguishing component of the composite ultra-fine dry powder fire extinguishing agent has excellent efficiency in absorbing free radicals in the flame, and 90% of the particle size is 15 μm.

It has a large specific surface area, so the fire extinguishing speed is very fast and the efficiency is very high.

ISOLATION EFFECT ON SURFACE COMBUSTION

The super-fine dry chemical powder of ammonium polyphosphate composite material not only can extinguish the flaming combustion but also can extinguish the flameless combustion(smoldering) of generally fixed substances.

When the super-fine dry powder crystal contacts the surface of the burning substances, the fire extinguishing agent component is melted under the high temperature of the solid surface and forms a carbide layer, which penetrates the pores of the burning surface.

The carbide layer formed on the surface of the burning solid separates the solid surface from the surrounding air and suffocates the combustion.

SHIELDING AND COOLING OF THERMAL RADIATION AND DILUTION OF OXYGEN

Super-fine dry powder fire extinguishing agent has a large surface area. When using it to extinguish the fire, a large amount of powder is sprayed into the flame in the form of mist and mixed with the flame, which can block the heat radiation of the flame on the surface of the combustibles, reduce the intensity of combustion, effectively isolate the baking of the flame on the combustibles, and prevent the continuous development of combustion.

The base material of ultra-fine dry powder fire extinguishing compound undergoes a series of decomposition endothermic reactions under the high temperature of the flame, which can absorb part of the heat, while some inactive gases generated by the decomposition reaction, such as carbon dioxide and water vapor, have a dilution effect on the oxygen concentration in the combustion zone, thus playing a role in cooling and slowing down the combustion.

THE CHARACTERISTIC

As a new fire extinguishing medium, Super-fine dry powder has the following main characteristics:

Characteristic ONE: Strong firefighting effectiveness

The super-fine dry powder system can be used in the distribution cabinet in the distribution room, cable trench, cable inter-layer, communication machine station, and other places that are unattended and can be solved by traditional means.

It can realize passive spontaneous startup, extinguish the fire at the initial stage of ignition, achieve the purpose of early suppression, and reduce losses.

It is suitable for places with narrow internal environments such as cable tunnels, cable trenches, and cable shafts.

Characteristic TWO: Simple System And Low Cost

It does not need to set up a special bottle storage room, with a small floor area, now power supply and complex electronic control equipment and pipelines, no special smoke and heat detectors, and avoids the possibility of wrong operation.

The system is simple in construction and high in reliability, which saves the building area and greatly reduces the project cost.

Characteristic THREE: Small Amount of Fire Extinguishing Agent and Low Fire Extinguishing Cost

The traditional fixed gas fire extinguishing system takes the room with a large enclosed space as the protection area, while the ultra-fine dry powder automatic fire extinguishing device only determines the amount of fire extinguishing agent according to the calculated area or volume of the protected object.

The amount of fire extinguishing agent is greatly reduced and the cost of one-time fire extinguishing is reduced.

Characteristic FOUR: It is a Superman

It not only can be used for total flooding purposes but also as a direct-to-source or local application; not only for enclosure areas but also for open areas. suitable for any new construction, reconstruction, and expansion project, with low construction requirements, especially for large space protection.

Characteristic FIVE: Environmentally Friendly Product

It does not cause any pollution to the environment, with high fire extinguishing efficiency.

PRODUCT SELECTION SUGGESTION

Super-fine dry powder fire extinguishing systems include the following three types：

• Piping Type.
• Cabinet Type.
• Hanging Cylinder Type.

According to the size of different protection areas, different protection objects, and different customer needs, we can choose different ultra-fine dry powder fire extinguishing devices.

At the same time, the dosage of dry chemical powder should also be designed according to the corresponding specifications to ensure effective fire extinguishing ability.