液氢加氢站的液氢储罐转注过程动态模拟

Dynamic Simulation of Liquid Hydrogen Storage Tank Transfer Process in Liquid Hydrogen Refueling Stations

摘要:

为了解决目前液氢加氢站用液氢增压泵入口处液氢因压力不足导致产生闪蒸现象从而威胁液氢增压泵的稳定运行的问题，进行液氢加氢站内液氢储罐转注过程的动态模拟，并提出针对液氢储罐内的压力管理策略。利用MatLab软件平台，建立了耦合液氢增压泵蒸发气回流与自增压的液氢储罐转注过程热力学模型。分析了液氢转注过程中压力温度变化规律，提出了一套预防液氢储罐内液氢产生闪蒸现象为目标的压力管理策略，并对压力管理策略中的自增压目标压力进行优化，得到了最优的目标压力。可为液氢加氢站中液氢转注过程的自增压程序的编写提供理论指导。

Abstract:

To address the issue of flash evaporation caused by insufficient pressure at the inlet of liquid hydrogen pumps in hydrogen refueling stations—a phenomenon that threatens operational stability—it is imperative to develop a dynamic simulation of the onboard transfer process and establish an effective pressure management strategy for liquid hydrogen storage tanks. Using the MatLab software platform， this paper develops a thermodynamic model of the liquid hydrogen transfer process that integrates boil-off gas recirculation and tank self-pressurization. It systematically analyzes the variations in pressure and temperature during transfer， leading to the proposal of a pressure management strategy designed to prevent flash evaporation. Furthermore， it optimizes the target self-pressurization pressure within this strategy， yielding a definitive optimal value. This paper provides theoretical guidance for programming self-pressurization procedures during liquid hydrogen transfer in hydrogen refueling stations.