A Novel Environmental-Friendly Gel Dry-Water Extinguishant Containing Additives with Efficient Combustion Suppression Ef
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A Novel Environmental-Friendly Gel Dry-Water Extinguishant Containing Additives with Efficient Combustion Suppression Efficiency Zhiyue Han *, Li Gong, Zhiming Du and Huiqiang Duan, State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, China Received: 12 August 2019/Accepted: 16 January 2020
Abstract. Environmental-friendly and highly efficient combustion suppression performance is the requirement for extinguishant. Dry water extinguishant integrates the advantages and characteristics of both dry powder and water mist extinguishant, so it has better fire extinguishing efficiency. Moreover, dry water extinguishant has less residue, no fugitive settling, non-toxic and harmless advantages after fire extinguishing. This work focus on producing dry water extinguishant powder by high-speed shearing. Then, the influence of the proportion of each component in the extinguishant formula on the coating effect was analyzed. The extinguishing effect of the optimized four dry extinguishing agents was tested by a portable spray device. Experiment results show that optimized four extinguishing agents are effective in extinguishing n-heptane fire and anhydrous ethanol fire. Among them, ammonium dihydrogen phosphate dry water extinguishant has the highest extinguishing efficiency to n-heptane fire, and potassium oxalate dry water extinguishant has the highest extinguishing efficiency to anhydrous ethanol fire. Keywords: Dry-water extinguishant, Environmental-friendly, Fire extinguishing effectiveness, Fire extinguishing mechanism
1. Introduction More and more fire risks cause extensive wealth loss and pose grave threat to our lives with the rapid urban expansion and social development. Fire extinguishing products with environmental-friendly and highly efficient combustion suppression are the key to prevent the fire damage to human society and even nature [1]. Halon fire extinguishing agent has been widely used in various occasions with its characteristics of high efficiency, non-conductive, and easy to store. Nevertheless, due to the great destructive effect on the ozone layer and the toxicity to * Correspondence should be addressed to: Zhiyue Han, E-mail: [email protected]
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Fire Technology 2020 humans, it has been banned all over the world since the signing of the Montreal Convention [2]. Therefore, seeking environmental-friendly Halon substitute products with high fire extinguishing efficiency has become the focus of fire extinguishing agent research field in various countries. For liquid fire, dry powder extinguishing agent can extinguish the surface fire of liquid fire, but these substances cannot cool fuels effectively, on the contrary, it can easily cause a recrudescence phenomenon and secondary pollution after using [3]. Water could cool both flame and fuel effectively because of its high heat capacity, however, in most fire-fighting operations, the force of the water is so great that water will cause splashing and boiling over upon contact with the liquid fu
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