Accurate Predictions of the Effect of Hydrogen Composition on the Thermodynamics and Transport Properties of Natural Gas

This work demonstrates the need for accurate thermodynamic models to reliably quantify changes in thermophysical properties of natural gas when blended with hydrogen. For this purpose, a systematic evaluation was carried out on predictive accuracy three well-known models, Peng–Robinson equation state (EoS), multiparameter empirical GERG-2008 model, and molecular-based polar soft-SAFT EoS, describing behavior mixtures hydrogen commonly found components gas. Deviations between calculated experimental data phase equilibria, critical loci, second-order derivative viscosities are used determine performing either equally or better than other two examined models. The effect H2 content methane, simulated as at conditions transportation, reveals higher blend density speed sound increasing within 5% change per 5 mol % added, while viscosity is least affected property, changing by 0.4% every H2.