Experimental research on thermal stratification of liquefied gas in tanks under external thermal attack
Experimental research on thermal stratification of liquefied gas in tanks under external thermal attack
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DOI：
10.1016/j.expthermflusci.2012.03.013
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发表时间：
2012-09
影响因子：
3.2
通讯作者：
Jianyun Shi;Mingshu Bi;Xue Yang
中科院分区：
文献类型：
--
作者：
Jianyun Shi;Mingshu Bi;Xue Yang
液化气储罐暴露在火灾中，储罐内的温度和压力会升高，并可能导致沸腾液体膨胀蒸汽爆炸(BLEVE)。相关研究表明，液化气热分层对BLEVE危害的可能性和严重程度有很大影响。在本研究中，建立了一种模拟液化气罐在外部热攻击下的热响应的装置。在试验中，用两个漏斗形电加热器模拟火灾，用一个小钢制容器模拟储罐，用水模拟液化气。为了模拟不同的事故情况，在试验中调整了加热器的充注度、加热器功率和受热面积。结果表明，单独加热液体空间壁时，液体温度基本均匀，而同时加热液体和蒸汽空间壁时，温度分层明显。根据实验结果，讨论了温度层结的出现和消退。
When liquefied gas tanks are exposed to fire, the temperature and pressure in tanks will increase and may cause boiling liquid expanding vapor explosion (BLEVE). According to relevant researches, the likelihood and the severity of BLEVE’s hazards are significantly affected by the thermal stratification of liquefied gas. In this research, a device was set up to simulate the thermal response of liquefied gas tank under external thermal attack. In the tests two funiform electric heaters were used to simulate the fire, and a small steel vessel was used to simulate the tank, and the liquefied gas was simulated by water. The fill level, the heater power and the heated area were adjusted in the tests to simulate different accident conditions. The results showed that the liquid temperature is nearly uniform when the liquid space wall was heated solely; however, the temperature stratification was obvious when the liquid and vapor space walls were heated simultaneously. Based on the experimental results, this paper discusses how the temperature stratification appears and fades away.