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< Natural Gas and Oil > Editorial Department
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Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2013 Vol.4

    Balance Flash Calculation Based on Stability Analysis
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    Key Words：Gibbs free energy； Stability analysis； Flash calculation； Successive substitution method
    Abstract： In phase equilibrium calculation of vapor-liquid two-phase system，only calculation of mixture saturation point can not accurately determine phase separation production. For multiphase system，only calculation of mixture saturation point can not accurately determine mixture phase region. Based on Gibbs minimization principle，stability analysis can be used to determine the phase number of mixture quickly and efficiently. Successive substitution method is used for iterative calculation of specified phase number so as to obtain the strict solution of equilibrium flash result. Discussed is the application by giving an example of stability analysis in vapor-liquid two-phase and vapor-liquid-liquid three-phase equilibrium calculation and used is successive substitution method to calculate every phase composition. Calculation results show that this method is simple and reliable and can be used for strict calculation of all kinds of phase equilibrium in oil and natural gas chemical industry.
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