Vapor-liquid Equilibrium Calculation of CO2-based Mixture Based on PC-SAFT Equation of State
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 con-tribution 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.
PC-SAFTvapor-liquid equilibriumCO2-based mixtureCO2 power cycle
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