摘要
为研究液化气体泄漏时发生沸腾液体膨胀蒸气爆炸(BLEVE)现象,基于杨-拉普拉斯公式及汽泡形成和成长的条件特性,应建立液化气气体泄漏发生BLEVE现象的滞止时间模型。根据泄漏气体的喉部泄漏特性,建立气体泄漏速度公式;依据泄漏压力容器内部气体比体积变化情况,建立压力容器内部比体积数学模型;基于气体泄漏速度公式及压力容器内部比体积数学模型得到液化气体泄漏发生BLEVE现象的滞止时间数学模型。结果表明,过热度足够高时,将使汽泡内部的饱和蒸气压强打破汽泡表面张力形成的势垒,汽泡破裂,发生蒸气爆炸现象,在汽泡形成和上升过程中,汽泡平均上升时间较长,实验结果验证了模型的有效性。
In order to study the phenomenon of BLEVE occurring in the process of leakage of liquefied gas, a stagnation time model of the BLEVE of liquefied gas should be built on the basis of the Yang Laplace equations of thermodynamics and dynamics and the formation and growth conditions of bubble. A formula was worked out for calculating gas velocity of leakage according to characteristics of throat leakage. An internal specific volume mathematical model was built for the pressure vessel on the basis of changes of specific volume of inside gas in pressure vessel. A stagnation time model was built on the basis of both the formula and the model.The results show that a sufficiently high degree of overheat built will make pressure of the saturated vapor in a bubble reach a level that is adeguate to burst it, leading to phenpmenon of BLEVE, and that average rise time of a bubble is more longer than that of formation of it during formation and rising of bubble. Effectiveness of the model was verified though experiments.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第3期76-80,共5页
China Safety Science Journal
