液化天然气储罐内BOG存量及产生速率计算方法

A Method to Calculate the Volume and Generation Rate of BOG in LNG Storage Tanks

目前液化天然气场站监控系统缺乏对BOG存量及产生速率的监控模块。对这两个变量的监控,可提高场站运行的经济性和安全性。本文提出了一种基于储罐气相空间温度、压力以及液位计算罐内BOG存量及产生速率的方法。步骤包括:计算BOG临界压力、临界温度、对比压力、对比温度、压缩因子、BOG水容积以及最终的BOG存量。本文通过对一段时间内BOG存量的线性拟合,得到BOG的产生速率,以一个实例演示了计算过程。

Currently the LNG station control system lacks the monitor module of BOG volume and generation rate. Monitoring of these two variables can improve the economy and safety operation of the station. A calculation method is proposed to calculate the volume and generation rate of BOG in LNG storage tanks based on vapor space temperature, pressure and liquid level. The calculation steps include： calculating BOG critical pressure, critical temperature, relative pressure, relative temperature, the compressibility factor, water volume of BOG, and the final standard volume of BOG. By linear fitting the BOG volume to time, BOG generation rate can be obtained. The method is showcased by a typical case.