Advanced thermodynamics of hydrogen and natural gas blends for gas transmission and distribution networks

Abstract

The cubic, multiparameter and saft based equations of state (Peng-Robinson, AGA8, GERG-2008 and PC-SAFT) were used to predict thermo-physical properties of H2-mixed with N2, CO2, C1-C4 as a H2-enriched natural gas blend. The experimental data covers a range of 10–200 bara and temperatures 15 °C, 25 °C, and 45 °C with high accuracy and precision. These data were measured with the UK's unique hydrogen thermodynamic test rig situated at the TÜV SÜD National Engineering Laboratory (hereby referred to as NEL).

Based on our research, it has been determined that, under the mentioned experimental conditions, the AGA8 and GERG-2008 have the capability to predict thermophysical properties of H2-enriched natural gas, and the Peng-Robinson can be used to predict with good accuracy the values of density and speed of sound of this complex mixture without attempting to tune binary interaction parameters. Although, PC-SAFT is preferable for the modelling of associating compounds, it showed acceptable and reliable results for H2 containing mixtures as well.