Fire characteristics of the hottest archives wareh

2022-08-12
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Fire characteristics of archives and application of new fire-fighting technology

archives are places for retaining cultural relics with high cultural and historical value, and archives are non renewable. The archives of our country are basically paper-based. A large number of paper-based archives are stored in the warehouse, which has a great fire risk. Once a fire occurs, the fire will spread rapidly due to the flammability of the paper. At the same time, because the filing cabinets and shelves are densely placed, the fire access is not smooth, so it is very difficult to fight the fire; In addition, the paper has the characteristics of smoldering, so it is difficult to put out the general fire extinguishing agent completely, or the archive data is damaged due to the long fire extinguishing time, so the fire in the archive warehouse is highly valued by the fire department

in addition, because the archives warehouse is a non open space, the site is narrow and there are many obstacles, even if there is enough fire-fighting power, it is difficult to invest, and the problem that the combat power cannot be carried out in a narrow space must be solved by automatic fire-fighting

with the development of economy, archives institutions at all levels also pay more attention to fire-fighting measures, strengthen the investment in fire safety of archives warehouses (especially ancient buildings), and enhance the ability of self-help, such as adding automatic fire alarm, 1211 or carbon dioxide and other automatic fire-fighting facilities, and some even set up special fire-fighting stations; However, due to the characteristics of archives warehouse such as bracket hole, bushing, working surface with axle hole, reducer and so on, the ideal fire extinguishing effect is still not achieved; Therefore, the fire fighting of archives warehouse is still a subject that needs to be improved

second, the weakness of existing fire extinguishing agents and devices

because most of the file carriers in China are paper, water spray, water mist and other water system fire extinguishing methods will make them moist and damaged, so they can't be used; The hot aerosol extinguishing agent is not used because of its high outlet temperature and the fact that the pollution is not easy to remove; Therefore, the archives warehouse generally adopts "Halon" series fire extinguishing devices or carbon dioxide automatic fire extinguishing devices

"Halon" series fire extinguishing agents: Although the fire extinguishing effect of 1211 fire extinguishing agent is good, due to the sharp decline in imported equipment, it has a destructive effect on the atmospheric ozone layer. According to the Montreal agreement of the United Nations Environment Agency and the national plan for the phasing out of ozone depleting substances in China approved and implemented by the Chinese government, China will completely stop the production and use of Halon 1211 on December 31, 2005, The production and use of Halon 1301 was completely stopped in 2010

carbon dioxide fire extinguishing system: this system does not pollute the environment and does not corrode the protectors during fire extinguishing, but it also has disadvantages: in practical applications, high-pressure systems with high-pressure liquefaction storage and low-pressure systems with low-temperature storage are usually used; High pressure storage requires a large number of bottle groups, a large area of bottle storage room, and strict requirements on the storage environment temperature. The low-pressure system requires external refrigeration equipment, and the cost is higher than that of high-pressure steel cylinders, but according to our experience, the requirements for transportation pipelines are also strict. At the same time, the use of carbon dioxide system is not only costly and difficult to construct, but also because carbon dioxide is a physical fire extinguishing, the fire extinguishing speed is slow; It will also suffocate those who fail to evacuate from the protection area

heptafluoropropane, trifluoromethane and other products are transitional products in the Halon elimination period. They are also unsatisfactory due to low fire extinguishing efficiency and high cost, and are rarely used

at present, there is also a pulse ultra-fine dry powder fire extinguishing agent on the market. Its dry powder particles are finer than ordinary dry powder, with an average particle size of about 15 microns. This device is started by gunpowder explosion. With large shock waves, if multiple vehicles are started at the same time, it will bring devastating damage to the protection objects, and may even cause secondary disasters. Due to the fire extinguishing agent, the total flooding effect of this fire extinguishing device is poor, and the local protection is also very easy to re ignite because of the short spraying time. Therefore, the pulse ultra-fine dry powder fire extinguishing device is not suitable for archives and Book systems

III. application of new ultra-fine dry powder high-efficiency fire extinguishing agent and automatic fire extinguishing device in archives warehouse

"ultra-fine dry powder high-efficiency fire extinguishing agent", which is used to extinguish fire in archives warehouse, is strongly recommended by the national archives administration. The fire extinguishing agent and device obtained the "identification certificate of scientific and technological achievements" issued by the National Archives Bureau at the end of 2003

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