Public Lecture Abstract: Markus Richter

New accurate density measurements and improved models for predicting cryogenic LNG properties

presented by Professor Markus Richter of Ruhr-Universität Bochum, Germany

17th Mar 2017 8:30 – 9:15 am

ARRC, 26 Dick Perry Ave, Kensington WA 6151

The accurate knowledge of thermodynamic properties for liquefied natural gases (LNG) is essential not only for the efficient and optimal design of industrial processes, but also for economic reasons, e.g., custody transfer. It is common practice to provide the thermodynamic information by means of equations of state. They can either be property specific equations, such as the Costald or the revised Klosek-McKinley (RKM) equations, or fundamental equations of state like the GERG-2008 or AGA8 equations. However, these models are correlated to experimental values for thermodynamic properties so that the range of validity and the quality is restricted to the availability and accuracy of the experimental data. In this context, we accurately measured the density of six synthetic LNG mixtures and also of the most relevant binary mixtures. Based on the new experimental data and available literature data, the RKM equation was enhanced by a pressure dependent contribution, thus, enabling accurate density calculations of the homogeneous liquid phase of LNG at pressures up to 10 MPa over the temperature range from 100 K to 135 K. Because the new enhanced method can only be used to calculate liquid phase densities, a new fundamental equation of state, which can also be used to predict other fluid states and caloric properties, has been developed and should be of great interest to the LNG industry. With this new fundamental equation, the representation of our experimental density data for six synthetic LNG mixtures from the present project was significantly improved.

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