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《Journal of Safety and Environment》 2009-01
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Study on the thermal radiation of the boilover fire on the oil tank

TAN Jia-lei,ZONG Ruo-wen,ZHI You-ran State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230027,China  
The given paper is to present our study and analysis of the boilover fire and its hazardous nature in causing big fires.As is known,thermal radiation is one of the most hazardous fire-leading causes.In order to resolve the complicated calculation problem with the thermal radiation produced by the boilover fire,it is suggested to divide its process into four stages,that is,quasi-steady burning stage,pre-boilover stage,boilover stage,and the post-boilover stage.According to our experimental data,they can further be divided into mass burning rate,flame temperature and flaming emissivity,respectively.The flame emissivity of the mixed refined oil can be found higher and stronger than that of the mixed crude oil.The flame temperature can also be found in slight increase with that of the diameter of oil tank.Since the quasi-steady burning stage is very much like that of pool fire,the latter may lead to the quasi-steady burning stage too.Comparing the value calculated with that gained from experiments,it can be found that both are in conformity.And,then,the strength of the thermal radiation at the quasi-steady burning stage has been worked out by introducing the solid flame model.The variations of the flame shape,flame temperature and fire area could lead to the mutation of thermal radiation,when the boilover fire took place.In this way,it made us,first of all,work out the boilover formulae and gain the boilover radius,then find the boilover radius at the boilover stage by introducing the formula of boilover radius.And,consequently,parameters,such as mass burning rate and oil mass,can also be worked out when the boilover took place.Since not all the oil out of the tank participates in the boilover,there would be hardly any error that may result from the calculation with the experimental data.Thus,the calculation with the thermal radiation and boilover radius at the boilover stage is expected to lay a theoretical foundation to reducing the damage caused by such fires.
【Fund】: 国家“十一五”科技支撑项目(2006BAK01B03-1)
【CateGory Index】: X928.7
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