Abstract: The mathematical model of the natural convection and the gasified mass transfer about LNG storage tank was established. Three dimension numerical values was applied to simulate the hot response process according to the different fire situation of the vertical and full storage tank.The values analyzes the hot response of the LNG storage tank at different filling ratio and fire situation. The research shows that the temperature in the LNG storage tank rises quickly and the natural convection is fierce at fire initial stage. The filling ratio of the LNG storage tank is higher relatively and the internal pressure response is also quicker, however, the temperature response is slower, what's more, the filling ratio of the LNG storage tank have a bigger effect on the pressure under the situation of the pool fire. The hot response caused by spraying fire is quicker than that of pooling fire. The computing results comply with the actual situation well, the research results may supply theory instruction for the project application.

Key words: LNG storage tank, Fire, Hot response, Filiting ratio, Numerical simulation

摘要： 建立了LNG受热自然对流及气化传质数学模型。针对立式全容储罐不同火灾情况的热响应过程进行三维数值模拟。分析了不同火灾情况下，不同充装率对LNG储罐热响应的影响。研究表明：火灾初期，罐内温升较快，自然对流剧烈。罐体充装率相对越高，罐内压力响应越快，温度响应越慢。且池火情况充装率对压力的影响更大。喷射火灾引起的热响应快于池火火灾。计算结果与相关文献吻合较好，可为工程应用提供一定的理论指导。 

关键词: LNG储罐 , 火灾 , 热响应 , 充装率 , 数值模拟