Vapor-liquid Equilibrium Calculation of CO2-based Mixture Based on PC-SAFT Equation of State

被引：0

作者：

Wang, Jingyu ^{[1
]}

Tian, Hua ^{[2
]}

Shi, Lingfeng ^{[2
]}

Wang, Xuan ^{[1
]}

Shu, Gequn ^{[1
,2
]}

Sun, Rui ^{[1
]}

机构：

[1] State Key Laboratory of internal combustion engine, Tianjin University, Beijing,300354, China

[2] Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Beijing,230026, China

来源：

Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | 2024年 / 45卷 / 03期

关键词：

Binary mixtures - Equations of state of liquids - Phase equilibria;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Perturbed Chain-Statistical Associating Fluid Theory (PC-SAFT) equation of state (EoS) can be applied to predict the physical properties of CO2-based mixtures in the CO2 power cycle. The convergence of PC-SAFT EoS is poor when calculating vapor-liquid equilibrium (VLE) of CO2-based mixtures. In this paper, the vapor pressure estimation method based on group contribution is used to provide the initial value for the PC-SAFT EoS and complete the calculation of the VLE of CO2-based mixtures from the perspective of groups. The accuracy of this method is higher than that of REFPROP 9.0 in many cases, especially in the case of a high CO2 ratio. For the calculation of CO2-based mixtures with large temperature slips, this method will not calculate the uneven cusps in REFPROP 9.0. It avoids abnormal calculation results in some cases and is a stable and reliable calculation method. © 2024 Science Press. All rights reserved.

引用

页码：683 / 688