- Author
-
Kangedal, P.
|
Hertzbert, T.
|
Arvidson, M.
- Title
- Pyrotekniskt genererade aerosoler for brandslackning: en litteraturstudie. [Pyrotechnically Generated Aerosols for Fire Extinguishment: A Literature Survey.]
- Coporate
- SP Swedish National Testing and Research Institute, Boras, Sweden
- Report
-
SP Report 2001:28
2001
48 p.
- Distribution
- For more information contact: SP Swedish National Testing and Research Institute, Box 857, SE-501 15 BORAS, Sweden. Telephone: +46 33 16 50 00, Fax: +46 33 13 55 02, Email: [email protected] Website: http://www.sp.se/eng/default.htm
- Keywords
-
aerosols
|
extinguishment
|
fire extinguishing agents
- Identifiers
- pyrotechnically generated aerosols
- Abstract
- [ONLY ABSTRACT IN ENGLISH] An aerosol constitutes of a mixture of gas and particulate material, where the particles can be in a liquid and/or solid form. The aerosol is by definition this mixture of phases but has often been associated to the particulate phase only. This report contains a literature study of pyrotechnically generated aerosols used for fire extinguishment. As indicated by the designation, the aerosol is generated by the combustion of a solid compound. The equipment ('generator') consists of a housing with four main parts, an electric ignition device, a block of aerosol-generation composition, a chemical coolant and a delivery nozzle. When activated, a mixture of fmely divided solid particles and gases are formed. Primarily, pyrotechnically generated aerosols extinguish the fife chemically, by interfering with the flame chain reaction. Physical action is due to the heat removal from the flame, as heat is absorbed during the phase transition of aerosol particles from solid to liquid and further to gaseous form. The technology is usually not suitable for use in occupied areas because of the recommended extinguishing concentrations may result in an atmosphere within the protected enclosure that cannot be safely breathed for a prolonged period. In addition, the visibility inside the protected enclosure is severely reduced upon the activation. The aerosol that is formed is believed not to contribute to global atmospheric warming or ozone depletion.