Modelling liquefied-natural-gas processes using highly accurate property models

Highlights: ► GERG-2008 is the new reference equation of state for natural gases and LNG. ► Higher accuracy calculating thermodynamic properties then typical engineering equations. ► GERG-2008 Property Package has been developed meeting the CAPE-OPEN standard. ► GERG-2008 can be embedded into multiple simulation software. ► Significant increase in accuracy simulating processes of liquefied natural gas. -- Abstract: Accurate simulations are important for efficient design and operation of a process. Therefore, a precise representation of thermophysical properties using an adequate property model is necessary. The GERG-2008 by Kunz and Wagner is the new reference equation of state for natural gases consisting of up to 21 specific compounds. It describes the gas and liquid phase as well as the super-critical region and the vapour–liquid equilibrium. In order to model LNG processes with the highest accuracy available, software available for the new equation is implemented into various common simulation tools. To ensure stable and consistent simulations, the GERG-2008 Property Package has been developed, which meets the CAPE-OPEN standard. The influence of property models on the simulation of the most important processes of the LNG value chain is investigated. Results show the expected advantages in accuracy for simulations using the new property model.