液化天然气接收站工艺优化运行研究

Research on Process Optimization and Operational Study of LNG Receiving Terminal

摘要: 液化天然气(Liquified Natural Gas, LNG)接收站在优化能源结构和改善环境质量中发挥关键作用，而蒸发气(Boiling Off Gas, BOG)的高效处理是保障接收站安全、经济及环保运行的核心环节。针对传统再冷凝工艺能耗高、最小外输量限制等问题，本研究提出一种预冷式BOG再冷凝工艺优化方案，旨在降低系统能耗。基于某LNG接收站的实际运行数据，通过HYSYS软件构建工艺模型，系统分析了BOG处理量、压缩机出口压力、BOG温度及外输压力等参数对系统能耗与液气质量比的影响规律。研究结果表明：在相同工况下，预冷式BOG再冷凝工艺相比传统工艺节能效果显著，系统总能耗、液气质量比和最小外输量均明显下降。研究结果为LNG接收站的工艺优化提供了理论依据，对提升接收站运行经济性、安全性及环境效益具有重要意义。

Abstract: Liquefied Natural Gas (LNG) terminals play a pivotal role in optimizing energy structures and improving environmental quality, with the efficient handling of Boil-Off Gas (BOG) constituting a critical link in ensuring safe, economical, and environmentally friendly terminal operations. Addressing the challenges of high energy consumption and minimum output limitations inherent in traditional re-condensation processes, this study proposes an optimized pre-cooled BOG re-condensation process designed to reduce system energy consumption. Utilizing actual operational data from an LNG terminal, a process model was established through HYSYS software to systematically analyze the influence of key parameters—including BOG processing capacity, compressor outlet pressure, BOG temperature, and output pressure—on system energy consumption and liquid-to-gas mass ratio. Findings demonstrate that under identical operating conditions, the pre-cooled BOG re-condensation process achieves significant energy savings compared to conventional methods, with marked reductions in total system energy consumption, liquid-gas mass ratio, and minimum output requirements. This research provides theoretical foundations for process optimization in LNG terminals, offering substantial implications for enhancing operational economy, safety, and environmental performance.