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Distribution of Particle Sizes of Water Mist Containing Fire Extinguishing Additives

Jiang Xin-sheng1,Wang Bo1,Zhou Jian-zhong1,Li Yang2(1.Dept.of Petroleum Supply Engineering,LEU,Chongqing 401311,China; 2.Unit 66198,Shanxi 032000,China)  
In order to investigate the fire extinguishing mechanism of water mist containing additives,the influence of additives on water mist particle sizes' distribution is mainly concerned in this paper to study the distribution of particle sizes of water mist containing various additives by using automatic surface tension meter and real-time laser particle size analyzer.Results show that:1) ammonium dihydrogen phosphate and urea make the surface tension of water increase slightly;fluorocarbon surfactant(Fc-134) and hydrocarbon surfactant(APG),and the mixture of above four kinds of additives make the surface tension of water greatly reduce;2) ammonium dihydrogen phosphate makes the number of droplets with particle diameter of 2.09-26.23 μm slightly decrease,while that of particles with diameter of 31.06-462.33 μm slight increase;3) fluorocarbon surfactant(Fc-134) makes the number of droplets with particle size of 8.05-22.16 μm increase,while that of particles with diameter of 22.17-278.64 μm reduce and that of droplets with diameter of 278.65-1 075.09 μm disappear completely;4) hydrocarbon surfactant(APG) makes the number of droplets with particle size of 2.09-31.06 μm reduce,while that of droplets with particle size of 36.77-141.86 μm increase.The mixed additive from above ones causes the number of droplets with particle size of 2.09-31.06 μm reduce while that of particles with size of 36.77-198.82 μm increase.
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