Experimental Study on Inhibition Effect of CF<sub>3</sub>I over Methane/Air Combustion in an Explosion Vessel

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  • 爆発容器を使用したCF<sub>3</sub>Iのメタン燃焼に与える影響に関する研究
  • 爆発容器を使用したCF3Iのメタン燃焼に与える影響に関する研究
  • バクハツ ヨウキ オ シヨウ シタ CF3I ノ メタン ネンショウ ニ アタエル エイキョウ ニ カンスル ケンキュウ

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<p>CF3I is a potential replacement of HALON fire extinguishing agents. However, it emits very toxic gases when applied against fire. So all possible schemes to reduce its amount should be evaluated for it to come into practical use. CF3Br, which has close chemical characteristics with CF3I, is known to have an enhanced combustion inhibition effect when it is mixed with some inert gas. It is easily anticipated that CF3I also has such effect, but it has not been studied yet. This paper reports an experimental study on reduction of explosion limit concentration of methane/air mixture when CF3I is added solely or together with some inert gas. When CF3I was added solely to a stoichiometric mixture of methane and air, explosion pressure observed in an explosion vessel decreased as concentration of CF3I increased. However, the profile of explosion pressure curve with concentration was quite different with the case of CF3Br. In the case of CF3Br, the explosion pressure decreased monotonically as the concentration increased, and no explosion occurred after the concentration exceeded the limit value. On the other hand, in the case of CF3I, the explosion pressure decreased as the concentration increased just as in the case of CF3Br, while the concentration was smaller than about 8%. Then the explosion pressure increased as the concentration increased. It reached a peak pressure, and decreased again until the concentration reached the limit value (51.5%). The enhanced inhibition effect was also observed when CF3I was combined with nitrogen or carbon dioxide.</p>

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