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- W3216975534 abstract "Summary Subsurface hydrogen (H2) storage is a promising way to balance supply fluctuations of intermittent renewable energies (say, solar or wind). Issues including the heterogeneity of geological formations and two-phase flow mechanics may have a significant impact on the flow behaviour of H2 within the porous medium and may potentially degrade the subsequent recovery performance. Therefore, a full- compositional modelling study, using a very fine numerical grid to resolve the details of the flows, was conducted to analyze these risks and to understand the fundamental hydrodynamic mechanisms of H2 storage. We performed a range of 2D vertical simulations at a sector scale (10m×80m) to investigate the detailed flow behaviour of H2 with carbon dioxide (CO2) as cushion gas in heterogeneous systems. We observed that H2 could infiltrate the cushion gas in the proximity of the injectors, meaning that CO2 is not displaced away from the injectors in a piston-like fashion, as driven by the greater heterogeneity. As a result, under certain conditions, the purity of the back produced H2 may be much degraded. On the other hand, the overall storage performance of CO2 is generally good (>95%) and is much less affected by the permeability heterogeneity." @default.
- W3216975534 created "2021-12-06" @default.
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- W3216975534 date "2021-01-01" @default.
- W3216975534 modified "2023-09-23" @default.
- W3216975534 title "Compositional Simulation of Hydrogen Storage with Carbon Dioxide Cushion Gas in Subsurface Heterogeneous Porous Media" @default.
- W3216975534 doi "https://doi.org/10.3997/2214-4609.202121032" @default.
- W3216975534 hasPublicationYear "2021" @default.
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