Explosion Suppression with Hybrid Gas Generator System
A project was initiated to identify and evaluate options for the protection of an occupied compartment, such as the crow compartment of armoured vehicles, from fire and explosion hazards. Several potential extinguishing systems, including hybrid gas generator& were evaluated for their explosion suppression performance in real-scale explosion experiments using a mock-up of an armoured vehicle crew compartment. Among the extinguishing systems tested, the hybrid gas generators provided the best performance. Hybrid gas generator systems combine gas generator technology with a liquid fire suppression agent. The three hybrid gas generator systems evaluated in this project were, hybrid gas generator extinguishers with HFC-227ea, Novec1230, and water, respectively. These hybrid extinguishers applied a novel method to deliver the suppression agents. A gas generator can produce a large quantity of inert gases (mainly N2, CO2 and H2O vapour) by combustion of solid propellants. The heat and pressure generated by the combustion of the propellant in the gas generator are used to heat and expel the suppression agent (HFC-227ea, Novec1230 or water). The super fast discharge of a large quantity of inert gases, combined with the fire suppression action of the agent, can be used to provide explosion protection for the crew compartment. The experimental results showed that each extinguishing system could extinguish a deflagration type explosion in the compartment, but, depending on the situation, they may not prevent re-ignition of the explosion in the compartment. Their performance depended on many factors. Having obstacles in the compartment put an additional challenge on all extinguishers in suppressing the explosion. The suppression performance of the extinguishers depended on discharge direction~ Additives, such as sodium bicarbonate or potassium acetate, improved the suppression performance of all extinguishing systems, in addition to its primary purpose of scavenging thermal decomposition products or preventing the water from freezing.
explosion protection gas generator halocarbon agent
KIM Andrew CRAMPTON George
Fire Research Program,Bldg.M-59,Institute for Research in Construction,National Research Council of Canada Ottawa,Ontario,K1A 0R6,Canada
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
891-895
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）