LNG physical parameters are the basis for the establishment of LNG receiving terminal model

process simulation calculation. Based on foreign experimental data

Aspen HYSYS software was used to analyze and evaluate the prediction accuracy of physical parameters such as density

enthalpy

and dew point of PR

SRK

LKP and BWRS equations

and evaluate the gas-liquid equilibrium and thermodynamic parameters calculation model. The tank evaporation model of the LNG receiving terminal was established to compare the accuracy of the four equations of state. The results showed that the PR equation had the highest prediction accuracy in the calculation of gas-liquid phase equilibrium

and the relative error was 4.70%. The most accurate thermodynamic parameters were calculated by LKP equation

and the prediction error was 2.59%. Considering the calculation accuracy of thermodynamic parameters and phase equilibrium parameters

the PR equation had the highest precision and the prediction error was 3.77%. In addition

the simulation results of evaporation and tank pressure by PR equation are in good agreement with the field data. Therefore

PR equation is recommended for evaporation calculation of LNG receiving station. The research results are useful for the selection of physical parameters and the equation of state for evaporation calculation of LNG receiving station.