1.5m3独立C型LNG储罐蒸发率简化算法

摘要

Considering heat leakage factors of hull, sole timber, piping and heat insulating layer, a simplified numerical model for calculating evaporation rate of 1.5 m3 independent and C-type LNG storage tank is put forward.The independence of all heat leakage factors is proved, and the calculation system is established.The relationship between the evaporation rate and the environmental temperature is obtained by statistical regressive method, and a simplified calculation formula is proposed.The temperature field of tank is parameterized, and heat leakage factors are simplified and parameterized.Finite element method is used to numerically simulate temperature field of tank and obtain the value of heat leakage.The effects of hull, sole timber, piping and heat insulating layer on evaporation rate are compared.The calculation results show that temperature field of each heat leakage factor does not produce superposition effect in engineering design.Hull has a great effect on evaporation rate, but the effects of sole timber and piping are little.The results show that this algorithm can rapidly and effectively predict evaporation rate of 1.5 m3 independent and C-type LNG storage tank, and simplify modeling calculation process.It has a great practical value in the overall design phase of LNG storage tank.%提出一种考虑罐壁、垫木、管路、绝热层等漏热因素的1.5 m3独立C型LNG储罐蒸发率的简化计算数值模型,验证了各漏热因素的独立性,建立了计算体系,统计回归蒸发率与环境温度之间的关系,提出简化的计算公式.将罐体温度场参数化、将漏热因素简化并参数化,使用有限元方法对罐体的温度场进行数值模拟,得到罐体漏热量.比较罐壁、垫木、管路、绝热层等对蒸发率的影响,分析得出各漏热因素温度场在工程设计情况下不会产生叠加效应这一结论.罐壁对蒸发率影响较大,垫木、管路影响较小.结果表明,该算法可快速有效预报1.5 m3独立C型LNG储罐蒸发率,减少建模计算流程,在LNG储罐方案总体设计阶段有着较高的实用价值.