A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas

doi:10.1016/S1004-9541(13)60581-9

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (10): 1155-1161.DOI: 10.1016/S1004-9541(13)60581-9

A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas

Hamid Saffari, Alireza Zahedi

LNG research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, 16846, Tehran, Iran

收稿日期:2012-05-07 修回日期:2013-01-10 出版日期:2013-10-28 发布日期:2013-10-29
通讯作者: Hamid Saffari

A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas

Hamid Saffari, Alireza Zahedi

LNG research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, 16846, Tehran, Iran

Received:2012-05-07 Revised:2013-01-10 Online:2013-10-28 Published:2013-10-29
Contact: Hamid Saffari

摘要/Abstract

摘要： Cubic equations of state (EOSs) are simple and easy at calculation. One way of improving the accuracy of a cubic EOS is through the modification of temperature-dependent energy parameter by using alpha-function. The industrial applications of natural gas are very wide and as a result, prediction of thermodynamic properties and phase behavior of natural gas is an important part of design for such processes. In this work we develop a new α-function for the Peng-Robinson (PR) EOS with the parameters optimized especially for natural gas components. The parameters are generalized as a linear function of acentric factor. The results are compared to the predictions from original PR EOS and other α-functions in literature. It is shown that the new α-function presents a good accuracy with the average deviation of 1.42% for natural gas components.

关键词: Peng-Robinson, equation of state, natural gas, &alpha, -function

Abstract: Cubic equations of state (EOSs) are simple and easy at calculation. One way of improving the accuracy of a cubic EOS is through the modification of temperature-dependent energy parameter by using alpha-function. The industrial applications of natural gas are very wide and as a result, prediction of thermodynamic properties and phase behavior of natural gas is an important part of design for such processes. In this work we develop a new α-function for the Peng-Robinson (PR) EOS with the parameters optimized especially for natural gas components. The parameters are generalized as a linear function of acentric factor. The results are compared to the predictions from original PR EOS and other α-functions in literature. It is shown that the new α-function presents a good accuracy with the average deviation of 1.42% for natural gas components.

Key words: Peng-Robinson, equation of state, natural gas, &alpha, -function

Hamid Saffari, Alireza Zahedi. A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas[J]. Chinese Journal of Chemical Engineering, 2013, 21(10): 1155-1161.

Hamid Saffari, Alireza Zahedi. A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas[J]. Chin.J.Chem.Eng., 2013, 21(10): 1155-1161.

参考文献

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A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas

A New Alpha-function for the Peng-Robinson Equation of State：Application to Natural Gas

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