LNG储罐内蒸发气相空间压力动态过程分析

LNG储罐是LNG接收站的核心设备，LNG储罐的正常运行是整个LNG接收站保持正常运转的关键。LNG储存的过程中，外界的热量会不断的透过储罐的保温层，导致LNG蒸发引起液相体积减少且使LNG气液两相的组成发生变化。同时LNG的蒸发使储罐内的压力发生了变化。为了保证储罐内的压力在设计允许范围内，需要对LNG蒸发气体进行处理。LNG储罐内的压力变化规律对储罐的安全操作能起到重要的指导作用，而LNG储罐内的压力取决于蒸发气相空间的压力。蒸发气相空间压力的与环境温度、LNG液体的蒸发、蒸发气压缩机的运转等有关。本文的主要目的是对LNG储罐内的液体的蒸发进行研究，模拟储罐内蒸发气相空间的动态过程，从而对LNG储罐的操作提出指导，对储罐本身的设计提出了一些建议。

Analysis of Pressure Changes in LNG Storage Tank Vapor Space

LNG storage tank was the heart of LNG terminal entire LNG receiving terminal to maintain normal functioning. facilities, the normal operation of it was the key of the Dunng LNG storage process, the heat outside through the tank insulation layer, resulting LNG evaporation that caused liquid volume reduced and the compasitiom of LNG gas - liquid two - phase changed. At the same time, the pressure in tank was changed because of the LNG evaporation. In order to ensure the pressure of tank within the designed, the LNG evaparation needed to deal with. The law of pressure change played an important guiding role to the safe operation of the tank, while the pressure depended on the vapor pressure. The main purpose was to study the evaporation of liquid in LNG tanks, simulate tank vapor pressure change and thus provide guidance for the operation and design of LNG storage tanks.