Influence of the initial CH4-hydrate system properties on CO2 capture kinetics
Autor: | Quang-Du Le, Carla T. Rodriguez, B. Chazallon, Claire Pirim, Ludovic N. Legoix |
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Přispěvatelé: | Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Work (thermodynamics)
020209 energy Diffusion Clathrate hydrate Thermodynamics 02 engineering and technology Management Monitoring Policy and Law 7. Clean energy Methane Reaction rate chemistry.chemical_compound 020401 chemical engineering Natural gas 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Dissolution ComputingMilieux_MISCELLANEOUS [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Chemistry business.industry [SDE.IE]Environmental Sciences/Environmental Engineering Mechanical Engineering Building and Construction General Energy 13. Climate action [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] business Hydrate |
Zdroj: | Applied Energy Applied Energy, Elsevier, 2020, 280, pp.115843. ⟨10.1016/j.apenergy.2020.115843⟩ Applied Energy, 2020, 280, pp.115843. ⟨10.1016/j.apenergy.2020.115843⟩ |
ISSN: | 0306-2619 |
Popis: | Recovering methane from natural gas hydrate deposits using carbon dioxide injection is currently of great environmental and energetic interest as it shows potential for producing an energy resource while mitigating CO2 emissions through CO2 sequestration. This work investigates the exchange kinetic between CH4 and CO2 (or CO2-N2(v)) in synthetic hydrates, with an emphasis on the impact of CH4 hydrate formation conditions (e.g. driving force Δp) on the subsequent exchange reactions. Different driving forces Δp are utilized and show that the exchange kinetic is improved by a factor of ~3 when the exchange is performed with low Δp CH4 hydrates, for which there is a higher relative amount of free H2O(liq) (277 K); the kinetic is further improved when stirring is applied. Isobaric CH4 hydrates exhibit a fast primary hydrate dissociation and CH4 release, followed by a slower exchange kinetic, possibly limited by solid-state exchange diffusion or secondary CO2-rich hydrate formation within the stability field of CH4 hydrates. Upon exposure to a mixed CO2-N2(v) gas stream, secondary hydrate production is governed by the effective Δp remaining after dissolution of the gas mixture, and results in an even slower exchange reaction rate. These results may help optimizing recovery processes in field trial experiments, where both hydrates and liquid water coexist, and aid in predicting the risk of geo-hazards induced by unstable secondary hydrate formation. Furthermore, the exchange kinetic dependencies highlighted here are important as they affect the overall energy efficiency and energy cost of CH4 recovery processes in gas hydrate field trials. |
Databáze: | OpenAIRE |
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