石油与天然气化工2026，Vol.55Issue(4)：36-45,10.DOI:10.3969/j.issn.1007-3426.2026.04.005
陆上大型LNG薄膜型储罐日蒸发损失定量解析模型
Quantitative analytical model for daily boil-off rate in large-scale onshore membrane-type LNG storage tanks
摘要
Abstract
Objective Membrane-type liquefied natural gas(LNG)storage tanks offer significant advantages over conventional tanks,including higher volumetric efficiency,shorter construction periods,and lower carbon emissions.However,the thermal insulation design of membrane-type tanks in China still relies mainly on conservative calculations,often neglecting key factors such as the specific heat transfer characteristics of the structure and interfacial thermal contact resistance.This leads to overestimation of the daily boil-off rate(BOR)and increased cost.This study aims to propose a quantitative analytical model for the daily BOR that accounts for interfacial thermal contact resistance,using the world's largest onshore membrane-type LNG storage tank(240,000 m3)in eastern Guangdong as a case study.Method Based on Fourier's law,a layer-by-layer heat transfer analysis method was developed on accounting for the structural features of the sidewall,bottom,and roof,as well as the interfacial thermal contact resistance.Subsequently,the Greenwood-Williamson contact theory and the Gaussian distribution were introduced to analyze the solid-gas coupled heat transfer mechanism at the layered interfaces,thus quantifying the thermal contact resistance.Result The predicted daily BOR under extreme weather conditions in eastern Guangdong was 0.0442%,which was lower than the design target.With the design requirements met,optimizing the thickness of the bottom polyurethane foam was identified as the most cost-effective approach,achieving material saving up to 23.24%.Additionally,the surface roughness of the insulation material had a significant effect on thermal contact resistance,and selecting materials with a surface roughness of approximately 40 μm improved the thermal insulation performance.Conclusion This study provides theoretical support for the optimal design of membrane-type LNG storage tanks and offers important engineering guidance for balancing thermal insulation performance with cost-effectiveness.关键词
液化天然气/薄膜型储罐/日蒸发率/接触热阻/逐层传热分析/定量解析模型/绝热性能Key words
LNG/membrane-type storage tank/daily boil-off rate/interfacial thermal contact resistance/layer-by-layer heat transfer analysis/quantitative analytical model/thermal insulation performance引用本文复制引用
郑杰,张启悦,苗润金,杜亮坡,彭常飞,牛智民..陆上大型LNG薄膜型储罐日蒸发损失定量解析模型[J].石油与天然气化工,2026,55(4):36-45,10.基金项目
国家自然科学基金面上项目"带温差发电装置的翼型肋印刷电路板式LNG气化器热-流-电耦合机理研究及多目标优化"(52274064) （52274064）
