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arXiv · 2506.01082

Impact of hydrogen addition, up to 20 % (mol/mol), on the thermodynamic ($p$, $\rho$, $T$) properties of a reference high-calorific natural gas mixture with significant ethane and propane content

Daniel Lozano-Martín·Heinrich Kipphardt·Peyman Khanipour·Dirk Tuma·Alfonso Horrillo·César R. Chamorro
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Abstract

Injecting hydrogen into the natural gas grid supports gradual decarbonization. To check the accuracy of equations of state for hydrogen-enriched natural gas mixtures, precise density data from well-characterized reference mixtures are essential. In a prior study, we provided experimental measurements for a natural gas constituted mainly of methane and for two derived hydrogen-enriched mixtures. In the present study, being the second and final part of our investigation, density measurements for a high-calorific natural gas with significant ethane and propane content, along with two hydrogen-enriched variants (10 and 20 mol-% hydrogen) are provided. The mixtures are gravimetrically prepared following ISO 6142-1. Density measurements, conducted with a single-sinker densimeter at temperatures from (260-350) K and pressures up to 20 MPa, are compared with three equations of state: AGA8-DC92, GERG-2008, and an improved GERG-2008. Results indicate that all models perform better for methane-dominant mixtures than for those containing heavier hydrocarbons.

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Daniel Lozano-Martín, Heinrich Kipphardt, Peyman Khanipour, Dirk Tuma, Alfonso Horrillo, César R. Chamorro. 2025-06-01. Impact of hydrogen addition, up to 20 % (mol/mol), on the thermodynamic ($p$, $\rho$, $T$) properties of a reference high-calorific natural gas mixture with significant ethane and propane content. https://doi.org/10.1016/j.ijhydene.2025.05.173

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