CIESC Journal ›› 2018, Vol. 69 ›› Issue (S2): 31-37.doi: 10.11949/j.issn.0438-1157.20181103

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Selection of state equations for evaporation calculation in LNG receiving terminal

LI Ran1, LIU Jingjun2, LI Yuxing1, YIN Yue2, ZHU Jianlu1, CHEN Wenjie2, WANG Wuchang1   

  1. 1 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
    2 Qingdao LNG Co., Ltd., Sinopec, Qingdao 266580, Shandong, China
  • Received:2018-09-28 Revised:2018-10-05
  • Supported by:

    supported by the Fundamental Research Funds for the Central Universities (14CX02207A) and the National Natural Science Foundation of China (51504278).

Abstract:

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.

CLC Number: 

  • TH642

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