| At present, our country's fire situation is austere. Currently the mostly used fire extinguishment products is tend to destroy the ozonosphere being located at 25 to 40 kilometers above the earth, which imperil to human beings and the earth ecological balance. Therefore, the job of exploring its substitutes is carrying out all around the world. Water mist technology has a lot of advantages: using a little water to suppress a fire fast; small destroying nature to protecting special partner; having no environmental pollution. So it has occupied an important position in water fire extinguisher system, and has been the main substitute of the former fire extinguishment products. But, normal water mist belongs to physical methods to extinguish a conflagration, which exist a lot of disadvantages under some peculiar fire circumstances. So, expanding water mist's application range, developing the cleaning and high-effect water mist containing additives has already become one of the most hot research aspect in the nowadays'conflagration science.By a simulating experiment, this paper studies the fire suppression effectiveness with water mist containing a sodium chloride. The investigation focuses on the suppression effectiveness under various sodium chloride mass concentrations. And the paper explains the experiment phenomenon from two aspects: the chemistry influence and liquid-drop evaporation rate diminution. A set of experiments was conducted to study the characteristics of fine water mist with different NaCl concentration by using LDV/APV test system. This paper also studies the influence of the fire suppression effectiveness by changing the oil plate dimension and explains it in theory.This study is meaningful for the further study of the fire extinguishment mechanism and finding an optimal mass concentration match from effectiveness and economy. It also provides theory and experiment guide for exploring more effective and useful fire extinguisher system. |
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