The fire-fighting system of the computer room must adopt the gas automatic fire extinguishing device without corrosion.
Because of the gas automatic fire extinguishing device, fire extinguishing performance is reliable, does not damage the electronic equipment, concealed pipe layout installation, beautiful and neat, does not affect the overall effect of the computer room.
Inside the data center room, Heptafluoropropane fire extinguishing system is one of the most widely used gas fire extinguishing device, is widely used in various types of computer rooms, power distribution rooms, power distribution stations, archives, containers, industrial equipment, and other key protective areas of the gas fire extinguishing device.
However, people for the principle of heptafluoropropane fire extinguishing system is half-understood, today we will discuss the principle of heptafluoropropane fire extinguishing system and its fire extinguishing characteristics, in order to have the need for better users in the future to carry out the fire construction of the computer room.
One, the principle of heptafluoropropane
Heptafluoropropane chemical system nomenclature for 1,1,1-2-3,3,3-heptafluoropropane, according to the international common halogenated alkane nomenclature known as HFC-227ea.
It is the chemical formula of C3HF7, which is made of three elements: C (carbon), F (fluorine), H (hydrogen). It is a colorless, odorless, non-conductive gaseous fire extinguishing agent.
I think everyone should have some understanding of the two conditions of combustion is oxygen and combustion temperature. To achieve fire extinguishing, one is to consume the oxygen in the confined space, and the other is to reduce the combustion temperature of the space and the flame.
Sevoflurane fire extinguishing principle is through chemical and physical reaction **** with the fire, mainly chemical reaction-based, it is the fire extinguishing mechanism is composed of the following three parts.
1. Cooling of the protected area
The Heptafluoropropane fire extinguishing agent is sprayed into the protected area in the form of liquid, and when it is sprayed out, the liquid fire extinguishing agent is rapidly transformed into the gaseous state which needs to absorb a large amount of heat energy, thus lowering the temperature of the protected area and the surrounding of the flame.
2. Make the extinguishing agent dispersed
Heptafluoropropane fire extinguishing agent is composed of large molecules, extinguishing a part of the molecule occurs when the bond breaks need to absorb heat.
3. Depletes oxygen concentration
The spray of extinguishing agent and the presence of flames in the protected area reduces the concentration of oxygen, which in turn reduces the rate of combustion.
Two, the fire extinguishing properties of Heptafluoropropane
1. Good fire extinguishing
Heptafluoropropane physical fire extinguishing effect is the release of the liquid agent through the vaporization of the fire in the absorption of heat, resulting in a reduction in the flame temperature and the slow reaction of the chain of free radicals, to the point that the combustion reaction can not be maintained.
Sevoflurane has a rapid response and excellent combustion inhibition ability to avoid the occurrence of catastrophic fires in a timely manner.
2. Shorten the time to extinguish the fire
The development period of the fire is the stage of the development of the fire from small to large, the fatal combustion products, such as high temperature and smoke in the initial stage of combustion is also the most produced, the combustion products of the precision electronic equipment for the destructive nature of the relatively large.
In order to shorten the impact of thermal decomposition on the protected area, GB50370 "Design Code for Gaseous Fire Extinguishing Systems" specifies that the design criteria for Heptafluoropropane spraying time can not be greater than 10 seconds, while the Heptafluoropropane fire extinguishing system is not recommended to be used in the high temperature of more than 500 degrees Celsius in the environment of the protected area.
The Heptafluoropropane agent can be sprayed within ten seconds of the start of the release of the extinguishing agent.
Fighting fires before they are fully developed. Extinguishing a fire at the critical pre-fire stage can save tens of thousands of dollars worth of equipment and minimize the cost.
3. Friendly to electronic equipment
A large number of experiments have confirmed that Heptafluoropropane is more stable at room temperature, and the shorter the injection time and extinguishing time, the lower the concentration of hydrofluoric acid produced, and these concentrations of electronic and other equipment will not have a corrosive effect.
Hydrogen fluoride (HF) begins to decompose only at high temperatures (about 500 degrees Celsius), and HF has a strong, irritating odor that can be detected before reaching the maximum hazardous exposure concentration.
In addition, Heptafluoropropane does not contain particles or oil residue after release, vaporizes completely in the atmosphere leaving no residue, and is non-conductive, so it will not damage electronic equipment when extinguishing fires.
4. Basically harmless to human body
In accordance with NFPA2001 "Design Code for Extinguishing Clean Gaseous Extinguishing Agents," the concentration is less than 9% of the design concentration, the personnel do not need to evacuate the protected area; when the design concentration of 9% -10.5% of the design concentration of the protected area, the personnel in the protected area of the stay time of no more than 5 minutes; more than 10.5% of the design concentration, do not allow the protected area have personnel stay, otherwise it will lead to personal safety.
Heptafluoropropane has a non-toxic-responsive (NOAEL) concentration of 9% and a toxic-responsive (LOAEL) concentration of 10.5%.
According to GB50370 "Design Code for Gas Extinguishing Systems", the design concentration of Heptafluoropropane fire extinguishing system is less than 10%, so the protection concentration will be safe for human body.
5. Little impact on the environment
The greenhouse effect is the current international as the basis for global warming, to effectively evaluate the impact of a fire extinguishing agent on the warming of the environment, the first thing that should be considered is its direct and indirect impact on the environment.
Heptafluoropropane does not contain chlorine or bromine, does not destroy the ozone layer after extinguishing the fire, and its ozone potential ODP is 0, so it is a clean extinguishing agent.
According to the IPCC Fourth Assessment Report, the greenhouse effect index value of Heptafluoropropane, GMP, is 3220, but since Heptafluoropropane is only released when there is a fire, its effect on the greenhouse effect is negligible.
Heptafluoropropane fire extinguishing system in the fire extinguishing performance, the safety of the protection object, human safety, environmental impact can meet the requirements for clean gas fire extinguishing system.
It can be mainly used to protect electronic instruments, precision instruments and valuables, such as computer information room, telecommunication and communication facilities, power distribution rooms, substations, important cultural relics and other key protection areas.
The Heptafluoropropane fire extinguishing system has become one of the most widely used systems in the gas fire extinguishing system market.
At present, NFPA2001 (U.S. design standard for clean agent fire extinguishing system), ISO14520 (European design standard for gaseous fire extinguishing system) and GB50370 (Chinese design code for gaseous fire extinguishing system) have included the Heptafluoropropane fire extinguishing system into their standard system.
Xuzhou Lianan Fire Science and Technology Engineering Co., Ltd. has a major mission, need to rely on our scientific and technological strength, to reduce fire losses, to save more lives, and the company continues to summarize, constantly innovate, attach importance to the application of new technologies, new technologies, new materials, follow the "technical cooperation, cooperation of talent, resources *** enjoy, *** with the development! "business philosophy, adhering to the" integrity-based, the pursuit of excellence, service first "service tenet, with reliable product quality, excellent product performance, ultra-high cost-effective, efficient and quality service, with hard work, wisdom and effectiveness to play the company inside and outside of the various resources and the community at large to go hand in hand with the user, *** with the development, *** with the development and construction of China's firefighting industry to contribute wisdom and strength.