天然气与石油2026，Vol.44Issue(2)：1-8,8.DOI:10.3969/j.issn.1006-5539.2026.02.001
LNG动力船燃料舱动态保压模拟
Dynamic pressure control simulation of LNG fuel tanks on LNG-powered vessels
摘要
Abstract
Driven by global carbon neutrality goals,Liquefied Natural Gas(LNG)has emerged as a key alternative fuel in the maritime sector owing to its high calorific value and low carbon emissions.However,Natural Boil-off Gas(NBOG)generated by natural evaporation during LNG storage and transportation causes continuous pressure buildup in fuel tanks,posing safety risks.Therefore,accurate prediction of tank pressure variations and optimization of Boil-off Gas(BOG)management strategies are of significant importance.A 6,000 m3 Type-C twin-tank LNG-powered vessel is taken as the research object.Based on a representative round-trip route,fuel consumption and tank pressure dynamics under typical operating conditions,including ballast voyage,laden voyage,port entry/departure,and cargo loading/unloading,are systematically simulated.A thermodynamic evaporation model is developed based on the Peng-Robinson equation of state,and a coupled simulation of fuel supply and pressure control is implemented in MATLAB.Results indicate that tank pressure follows a rise-then-fall pattern during the evaporation phase.When tank pressure reaches the critical threshold,the reliquefaction system automatically intervenes to effectively suppress further pressure growth.Compared with ballast voyages,LNG consumption rates during laden voyages increase by 14.0%and 25.3%at speeds of 9.5 and 11.0 knots,respectively.When tank pressure exceeds 0.208 MPa,BOG is triggered to replace LNG as auxiliary fuel supply,reducing the LNG consumption rate by 19.5%.The findings demonstrate that phased pressure control strategy combined with dynamic fuel switching can enhance fuel utilization efficiency while ensuring operational safety,providing theoretical basis and technical reference for optimized operation of LNG-powered vessels.关键词
LNG动力船/航程模拟/动态模拟/BOG管理/压力控制Key words
LNG-powered vessel/Voyage simulation/Dynamic simulation/BOG management/Pressure control引用本文复制引用
徐常安,张辉,沈鼎盛,朱建鲁,张树森,姜庆华..LNG动力船燃料舱动态保压模拟[J].天然气与石油,2026,44(2):1-8,8.基金项目
国家自然科学基金"新型FLNG装置天然气带压液化复杂流动与换热的基础问题"(U21B2085) （U21B2085）
