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为研究液化气体泄漏时的沸腾液体膨胀蒸气爆炸(BLEVE)现象,从热力学和动力学角度出发,根据液化气体或超过常温沸点的高温液体泄漏特性,建立了液化气体泄漏发生BLEVE现象的滞止时间数学模型。在前期理论研究基础上,利用试验测定过热水爆沸反应的时间,验证所建滞止时间模型的有效性。采用电磁阀控制压力容器泄放管泄压,模拟发生泄漏,对采集的压强变化数据进行分析,确定过热水发生BLEVE现象的滞止时间。对试验测定与理论计算得到的滞止时间进行分析比较,得出相对平均误差小于6%,表明所建模型的有效性较高。滞止时间的研究是分析BLEVE机理及压力容器是否失效或发生更严重事故的关键。
In order to study the phenomenon of boiling liquid explosion vapor explosion (BLEVE) when liquefied gas is leaking, the stagnation time of the BLEVE phenomenon of liquefied gas leakage is established from the point of view of thermodynamics and kinetics, according to the leaking characteristics of liquefied gas or liquid at high temperature exceeding boiling point of liquefied gas mathematical model. Based on the previous theoretical studies, the time of overheated water bumping reaction was determined by experiments, and the validity of the built-up time model was verified. Solenoid valve was used to control the relief of the pressure vessel’s relief pipe to simulate the leakage. The data of the pressure changes were analyzed to determine the stagnation time of the BLEVE phenomenon in the overheated water. The relative average error is less than 6%, which shows that the proposed model is more effective. The study of stagnant time is the key to analyzing the BLEVE mechanism and the failure of pressure vessels or the more serious accidents.