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What is new S type aerosol fire fighting system

April 3, 2020

Here we recommend about “what is new S type aerosol fire fighting system“, for explain this topic, we have to know and describe its technology history first.

HISTORY

Aerosol fire extinguishing technology was developed since from 1960’s, and Russian army first use this technology based on its pyrotechnics, its integrated with the oil tank so at that time people also call it “oil tank fire suppression”, this is the Generation I of aerosol fire extinguishing technology.
And in 1990’s people around the world because care about the problem of ozone depletion which was caused by using halon products, so from this period on many countries because to attend the Montreal Protocol, which is aim to protect our ozone layer and forbidden to use halon extinguishing agent, at this time many new fire extinguishing agent became popular include aerosol, and at this stage some enterprises in United States, Cyprus, Netherlands, Italy, Malaysia etc because to develop a aerosol extinguishing agent by using “Potassium Nitrate” as main oxidant, within this period aerosol because more and more popular and global market because to recognize aerosol extinguishing technology to apply in fire protection industry, this potassium nitrate based aerosol is Generation II of aerosol fire extinguishing technology.
In about 2000’s, because of Potassium nitrate based aerosol have corrosion problem of electrical devices and electronics, so some china university and institutes work together with a few fire protection enterprises and researched out the new aerosol technology-the strontium nitrate based aerosol fire extinguishing agent, which is use Strontium Nitrate as main oxidant, this is called the Generation III aerosol fire extinguishing technology, and also the newest aerosol technology at present in the world.

After know about something about aerosol technology development, now we will explain “why S-type aerosol Generation III is the newest aerosol technology”, for describe this we have to mention about its advantages first.

ADVANTAGES AND FEATURES

  • Aerosol fire extinguishing agent is to suppress fire by cooling, dilution and by chemical inhibition, in which other fire extinguishing compound are only cooling, or only dilution or only chemical inhibition, so aerosol fire extinguishing agent is very functional and with very high fire extinguishing ability.
  • Compared with other gas fire suppression systems, it do not need to have pressure to work, so aerosol cylinder is without any pressure, but other suppression systems especially gas systems need to have a pressurized cylinders and containers to take and need to install gauge.
  • Aerosol system is ECO friendly and HUMAN friendly, because aerosol forming compound has low Ozone Depletion Potential(ODP) and Global Warming Potential(GWP) value, and ALT is also low, it is clean agent and further more, it is non-toxic, non conductive, non corrosive and have little residue after discharging.
  • Long Life Span, aging test for S type aerosol device shows that the aerosol generator put in a lab box heating to 90℃ and keep about 40 days, after putting it out and it still can work, this means s type aerosol fire extinguishing agent and its device is have a life span of more than 10 years.
  • Aerosol extinguishing agent to extinguish fire both physically and chemically.
  • Compared to K type aerosol agent, S type is not have bad effect on precision instrument and equipment.
    Aerosol have its particular advantages in fire protection industry so that is why aerosol fire extinguishing technology has been given much attention by worldwide people.

CLASSIFICATION

Accordingly to installation mode, it is divided into fixed type, or attached type or portable type, accordingly to main oxidant in aerosol forming agent, it is divided into potassium nitrate based, strontium nitrate based, and china institute is also try to research magnesium nitrate based; accordingly to agent discharging quality, it is divided into micro and mini size, general size etc; accordingly to product structure, it is divided into piping type and non-piping type, normally its non-piping.

FIRE SUPPRESSION PRINCIPLE

when the s type aerosol fire fighting system is discharging:

  • Free radicals are essential to the propagation of a fire-(free radicals of O,H and OH), s type aerosol extinguishing agent suppresses the fire mainly by chemical interference with these “free radicals” within the fire zone, free radicals are uncharged molecule (typically highly reactive and short-lived) having an unpaired valence electron.
  • S type aerosol agent and its inert gas suspension discharges and fills the hazard space volume, the chemical particle size is 1 to 2 micro, almost can reach everywhere.
  • Strontium radicals together with some potassium radicals from aerosol agent mixed with free generated by combustion (combustion free radicals).
  • Strontium particles and some potassium particles join with combustion free radicals, interrupting the fire’s reaction pathway and creating stable molecules.
  • The interrupted fire reaction pathway is not sustain combustion any more and the fire is suppressed completely, the fire is put off.

AEROSOL DEVICE STRUCTURE

its structure is very simple, normally its base structure is made up by the following materials:

  • ignition circuit terminals and aviation plug connector.
  • 304 stainless steel cylinder or heavy duty aluminum cylinder.
  • Electronic or thermal sensing ignition device.
  • Solid aerosol generating compound.
  • Spacer ring.
  • Separator grid.
  • Chemical coolant.
  • Coolant grid.
  • Directional 304 steel or steel plate.
  • Blow of cover(aluminum foil).
  • And also for additional materials of installation bracket and screws, and installation magnet with 3M glue.

APPLICATION

Because of s type aerosol is perfect performance in fire suppression, so it is widely used mostly apply in the following fields:

  • Wind turbine fields, the wind turbine cabin, impeller, control system, tower are the position where easy to cause fire, we should install a mini aerosol fire extinguishing system in the cabin and in their relative electrical cabinets.
  • Transportation vehicles, the bus, car, track, coach, vessel, aircraft, heavy duty and other vehicles will require a mini aerosol fire extinguishing equipment to be installed in their engine compartment.
  • Energy storage facilities, including energy storage station, power charging pile, cabinet, lithium battery etc, these facilities are easy to get fire because of variety of environmental and human factors.
  • Power and power supply facilities, including thermal power plant, hydro-power station, solar power station, wind power station, nuclear power plant, power supply company etc, and also their relative control systems and cabinets.
  • Communication facilities, including computer data center, server room, server rack, relay station, telecommunication control room etc, and their control panels and cabinets board.
  • Underground comprehensive gallery, including subway, water pipe, power gallery, sewage pipe, natural gas pipeline, communication pipeline, now days these underground galleries are key government projects, which require fire protection facilities to install over there.
  • Building facilities, including substation, library, archives, reference room, underground storage room, strongbox.
  • Mining facilities, including rolling mill equipment room, electronic instrument control room, cable tunnel, cable sandwich, transformer room.
  • Petrochemical facilities, including flammable liquid storage area, substation and power distribution room, generator room, cable well, power distribution cabinet, switch gear.
  • Other facilities like CNC machines, ATM machines, Rolling Machines and some high-priced mobile devices.

As we can see above application facilities are high value facilities and equipment that need a protection by fire extinguishing device, and s type aerosol extinguishing device is very suitable for them because S type aerosol agent is:

  • not have corrosion to them and not cause damage to them.
  • Cause little residue after releasing.
  • Small in size, versatile, functional and easy to install.
  • Long life span to be install there.
  • Not have pressure, so it is safe.

S type in full name is “Strontium nitrate based type”, because our aerosol extinguishing oxidant is chemical of strontium nitrate, almost occupy 42% to 50% percentage.

S type aerosol is till present the newest aerosol technology called “Generation Third” technology, for know more about aerosol and specially s type aerosol please refer to this research and academic articles:
HOT AEROSOL FIRE EXTINGUISHING AGENTS AND THE ASSOCIATED TECHNOLOGIES

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