【 Weak current college 】 building fire system---section IV-other commonly used fire extinguishing system--Power By 【 China power house network 】

1. carbon dioxide fire extinguishing system for carbon dioxide extinguishing systems belong to pure physics of gas fire extinguishing system, the principle is to reduce the content of oxygen in the air, making it not support combustion. Carbon dioxide fire extinguishing systems for fire extinguishing gas may be cut off before the gas fire, solid fire, liquid fires and electrical fires.　　May not be used for Suppression of nitrocellulose, gunpowder and other oxidants chemical fire. Carbon dioxide fire extinguishing system by fire mode can be divided into: ① ② total flooding systems; local application systems; ③ handheld hose system; ④ vertical tube system.　　The scope by system protection can be divided into: ① ② combined distribution system; unit independent of the system.　　System startup mode with manual and automatic, general use manual, no person can be converted to automatic type. The system works is this: when using auto-detection of the detector in the event of fire, sound, light and alarm, and through the control panel open start gas containers of gaseous discharge valve, to open the select start valves and cylinders of CO2 storage bottle valve and thus give off carbon dioxide fire extinguishing.　　When using the manual is directly open to manually start the installation, press the button to power on, press release carbon dioxide fire extinguishing the program above. Second, dry powder extinguishing systems as the extinguishing agent extinguishing system known as a dry powder fire extinguishing system.　　Dry powder extinguishing agent is a drying, easy-to-flow of fine powder, usually stored in a dry powder fire extinguishers or dry powder fire extinguishing equipment, fire extinguishing time by compressing gases (carbon dioxide or nitrogen) of pressure will dry powder shoot out from the nozzle, forming a unit together with pressurized gas atomised powder flow injection to combustion.　　Powder extinguishing agent on the inhibition of combustion, when a large amount of powder spraying to flame, it can absorb maintain combustion chain activity groups, with a sharp reduction in active groups, so that combustion chain interruption, flame off; in addition, certain compounds and flame exposure, its high heat powder suspension after bursting into many smaller particles, thus greatly increasing the powder and the flame of contact area, improving the effectiveness of the fire, this phenomenon is known as burning explosion; also, use dry powder fire extinguishing agent, powder spray surrounded the flame, the heat of the flame can be reduced, while powder heating evolve crystal water or factoring, can absorb some heat and decompose generated not lively.　　Dry powder with ordinary powder (BC), multi-purpose dry chemical (ABC) and metal special fire extinguishing agent (D class fire special powder). BC class powder under its manufacturing base of a sodium salt, potassium salt and amino dry powder.　　This type of powder suitable for extinguishing the flammable and combustible liquids such as gasoline, oil, etc., can also be used for fire extinguishing combustible gas (LPG, acetylene, etc) and electric equipment of the fire.　　Fire extinguishing with short duration, high efficiency, good insulation, fire losses small, plumbing, water, and the advantages of long-term storage. Dry powder fire extinguishing system according to its installation is fixed, half-fixed. According to its control startup methods and automatic control, manual control.　　According to its Jet dry way all submerged and local application systems.　　Third, foam extinguishing systems, foam extinguishing work principle is to apply foam to water miscible after a floating, glued in combustible, flammable liquid or solid surface, or filled with a burning material space, isolated, cooling of the burning material is off. Foam extinguishing agent by their constituents have chemical foam fire extinguishing agent, protein foam and synthetic foam fire extinguishing agent, and so several types.　　Foam extinguishing systems are widely used in the oil fields, oil refineries, oil tanks, power plants, garage, hangar and mine tunnels, etc.　　Foam extinguishing system according to its use have fixed, half of the fixed and mobile; the foam injection methods on a liquid jet spray, liquid, and spray modes of multiples by foam foaming has low times, times and power. Use foam fire extinguishing system, the first selection should be based on the nature of the foam liquid combustibles, such as certain liquid storage tanks for water soluble, should use anti foam liquid; on foam spray system to breathe bubble nozzle, protein foam liquid or fluorine, protein, water film and foam liquid; if non-breathing foam nozzle, you can only use aqueous film forming foam liquid; for in times and high expansion foam fire extinguishing systems you should use synthetic foam liquid. Second, the storage of foam tank should be placed in ventilated, dry place, the temperature should be at 0 ° c ~ 40 ° c range.　　In addition, you should ensure the foam fire extinguishing system required sufficient fire water, certain temperature (about 4 ° c ~ 35 ° c) and the required quality. Fourth, halon fire extinguishing system halon fire extinguishing system is to have a fire-fighting capabilities of halon fire extinguishing agent of hydrocarbons as a gas fire extinguishing system. At present there are applied more FM-200 (heptafluoropropane) and INERGEN (inergen). The equipment and facilities management in the figure a 5.4.6 for halon fire extinguishing system consists of a diagram.　　Halon fire extinguishing system for fire-fighting water cannot be used, such as the computer room, library and archives and heritage repositories, and other buildings. Halon fire extinguishing system with full submersion, partial application of the two categories. All submerged halon fire extinguishing system in a closed space, maintain a concentration of the halon fire extinguishing gas, so as to achieve the required immersion time. This system can be divided into portfolio allocation, unit independent and no pipe network system. Portfolio allocation system is a set of halon fire extinguishing equipment, can protect several protected areas. No distribution system belonging to the semi-fixed fire extinguishing systems for small area protection area, no fixed pipelines and storage containers.　　Local application of halon fire extinguishing system consists of fire extinguishing device directly to the combustion of spraying extinguishing system, but its various parts are fixed, automatic spray extinguishing agent. 5. mobile fire extinguishers, fire extinguisher is put on the fire of fire-fighting equipment, light and flexible, movable, a trained to control their operations using a method, a fire combat firefighting process better frontline fire-fighting tools. The current production of mobile fire extinguishers are foam fire extinguishers, fire extinguishers, water-base fire extinguishers, fire extinguishers, fire extinguishers, fire extinguisher, carbon tetrachloride and light metal fire extinguishers, etc. (1) foam fire extinguishers
Foam fire extinguishers to fight for flammable and combustible liquids, flammable solids fire. A.Class b, class c fire hazard workshop, warehouse, and civil buildings such as hospitals, Department stores, exhibitions, books and archival buildings, hotels, office buildings, building, floor, research building and housing, and extensive use of the extinguisher.

(2) acid-base fire extinguisher
Acid-base fire extinguisher to put out the fire flammable solids. Such as hospitals, Department stores, exhibitions, books and archival buildings, hotels, office buildings, buildings, theatres and residential, can adopt a Ph fire extinguishers.

(3) carbon dioxide fire extinguishers
Carbon dioxide fire extinguisher to put out the valuable equipment, library and archives, precision instruments, voltage in the electrical equipment of 600V following, and generally combustible solid substances from the beginning of a fire. A small generator room, computer room, communication scheduling floor, post building, book archives building, vehicle and vessel's engine room and building valuable equipment room, often using carbon dioxide fire extinguishers.

(4) dry powder fire extinguishers
Dry powder fire extinguisher can effectively fight for flammable and combustible liquids, flammable gases, electrical equipment and General solid material fire. Refinery and petrochemical plant of the factory, warehouse and open-air production plant, oil, oil tankers and oil tankers, civil construction department store building, exhibition floor, library, post office building, office buildings, hotels, theaters, residential as well as high-voltage capacitors, regulator rooms, extensive use of dry chemical fire extinguisher.