CIESC Journal ›› 2018, Vol. 69 ›› Issue (S1): 8-14.doi: 10.11949/j.issn.0438-1157.20180794

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Prediction of phase equilibrium of gas hydrates based on different equations of state

LI Siguang1, LI Yanjun1, YANG Longbin1, SHAO Yazhou1, SUN Jianrong1, XU Runzhang2   

  1. 1 College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China;
    2 College of Science, Harbin Engineering University, Harbin 150001, Heilongjiang, China
  • Received:2018-07-13 Revised:2018-07-20 Online:2018-09-30 Published:2018-09-30
  • Supported by:

    supported by the National Natural Science Foundation of China (51579048) and the Fundamental Research Funds for Central Universities (HEUCFG201819).


The fugacity calculation results will directly affect the prediction accuracy of the phase equilibria of gas hydrates. Based on the Chen-Guo model, four equations of state (RK, SRK, PR and PT EOS) are used to calculate the fugacity, then to predict the phase equilibria of methane, ethane and carbon dioxide gas hydrates in different temperature ranges, respectively. Results show that for pure water system the model with RK EOS is most suitable for predicting the phase equilibria of methane hydrate, while PR EOS is more suitable for the prediction of ethane and carbon dioxide hydrates. For ice system, SRK EOS is the most suitable for methane hydrate but the prediction below 218.2 K is the main reason for the low prediction accuracy. PR EOS suits the prediction of ethane hydrate and the prediction accuracy for the case below 230.2 K still needs to be improved. And RK EOS is suitable for predicting carbon dioxide hydrate, the prediction accuracy will be improved further if the prediction results below 270.7 K can be much closer to the experimental data.

Key words: gas, hydrate, phase equilibria, equation of state, prediction, fugacity

CLC Number: 

  • TQ026
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