F215 液体ナトリウム滴の着火・燃焼挙動に対する酸素濃度と温度の依存性(FBR(2),OS-8 軽水炉・新型炉・核燃料サイクル(3),一般講演,地球温暖化防止と動力エネルギー技術)

概要

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Liquid sodium used as a coolant of fast reactor has a large chemical reactivity with water and air. Hence, fast reactor plants have a lot of safety systems. If the oxidization and burning behavior is understood, some safety systems may not be needed and costs may be reduced. In this study, in order to understand the ignition and burning behavior of liquid sodium droplet, which is a fundamental reaction of sodium spray fire, the dependency of oxygen concentration and initial temperature on them was observed. Multi pillar-shaped oxides were found to grow longer when oxygen concentration and surface temperature are lower. It is suggested that the multi pillar-shaped oxides have a pourus configuration and the liquid sodium from droplet is drawn up to their tips by capillary force. The sodium droplet covered by pillar-shaped oxides was also found to be heated up to its ignition temperature and burns. The heat generation of oxidization contributes to the phenomena.
2008-06-18