外部时变热流对液化气体储罐的热响应规律

Thermal effect of time-dependent external heat on liquefied gas storage tank

火灾高温环境极易诱发临近液化气体储罐发生沸腾液体膨胀蒸气爆炸(BLEVE)事故。为研究火焰热辐射作用对液化气储罐及内部介质的热作用规律,本文建立以辐射加热源模拟外部火焰作用,过热水为介质的小型储罐BLEVE实验模拟装置。实验结果表明:储罐接收外部热作用时间越长,其泄爆产生的压力反弹越剧烈;外部热作用强度的增大,提升了储罐内部压力响应速率;储罐气相空间的加热作用可以提高内部温度分层度,气相加热面积越大,分层程度越大,从而泄爆后的压力反弹越低。

High-temperature environment outside the liquefied-pressure gases(LPG)tank can cause the boiling liquid expanding vapor explosion(BLEVE)accident of tank.In order to study the thermal effect on liquefied gas storage tank and internal medium,a small experimental device with superheated water as medium was established.The radiant heating source was used to simulate an external fire for the BLEVE process.Results showed that the longer the tank was subjected to external heat,the more intense the pressure rebound due to the explosion.The higher intensity of external heat held,the faster the internal pressure response of the tank.The heating of gas phase space could increase the internal temperature stratification.The increment of the gas phase area would augment the stratification,and reduce the pressure rebound of the lique ed gas inside the vessel if it failed.