喷射火环境下液化气储罐热响应行为数值模拟

应用CFD软件Fluent6.3对液化气（liquefied petroleum gas,LPG）储罐在火灾条件下的热响应过程进行了三维数值模拟。研究了喷射火作用下LPG储罐罐壁温度、内部介质温度和压力响应的特点,分析了液相介质充装率和储罐壁厚对储罐热响应的影响。结果表明,液相介质充装率越高,储罐失效时间越短,并且当充装率为60%~85%时储罐的失效时间下降更加明显;储罐壁厚越厚,火焰作用下升压越慢,当壁厚大于14mm时,壁厚对储罐升压的影响明显变小。据此,可选择合适的充装率和合理的壁厚以减缓储罐的升压速度,为预防和控制液化气储罐事故的发生争取时间。

Numerical simulation of thermo-responsive behavior of LPG tank on jet fire

The thermo-responsive behavior of LPG tank subjected to jet fire was simulated using CFD software FLUENT6.3. The results show that the higher the filling rate is, the shorter the failure time will be. Furthermore, the failure time reduces significantly with increasing filling rate from 60% to 85%. It was also found that the thicker the wall is, the more slowly the pressure rise. Moreover, when the wall thickness is over 14mm, the impacts of the thickness on pressure rise become little. Then, proper filling rate and wall thickness can be chosen to slowdown the rate of pressure rise, which would be helpful to preventing and controlling the failure of LPG tank.