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Swapping methane with carbon dioxide in spherical hydrate pellets

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  • Zhou, Xuebing
  • Li, Dongliang
  • Zhang, Shaohong
  • Liang, Deqing

Abstract

Recovering CH4 with CO2 in hydrocarbon hydrates is renowned as an eco-friendly method for potential energy production and climate change mitigation. Due to the foamy nature of hydrates, determining the effect of hydrate surface area on the CH4 recovering rate has always been a challenge. CH4 hydrates in this work were shaped into spherical pellets 16 mm in diameter, and the CH4-CO2 replacements were carried out at about 274 K, 3.0 MPa by adding different amount of pellets in the reactor. To reveal the kinetic properties, cryo-SEM and a model based on gas diffusion theory was also employed. Results indicated that the CH4 recovery rate in the replacement was proportional to the surface area of hydrate pellets. In each 1400-h replacement, the CH4 production level was found to be about 4.5%, suggesting the gas swapping process took place in each pellet was the same. The kinetic model provided well descriptions of the replacements with the average deviation no more than 10%. The SEM images and the gas diffusion constants obtained from the kinetic model suggested that water mobility determined the gas diffusion rate in hydrates and help to smooth the hydrate surface during replacements.

Suggested Citation

  • Zhou, Xuebing & Li, Dongliang & Zhang, Shaohong & Liang, Deqing, 2017. "Swapping methane with carbon dioxide in spherical hydrate pellets," Energy, Elsevier, vol. 140(P1), pages 136-143.
    • Handle: RePEc:eee:energy:v:140:y:2017:i:p1:p:136-143
    DOI: 10.1016/j.energy.2017.08.082
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    References listed on IDEAS

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    1. Ouyang, Qian & Pandey, Jyoti Shanker & von Solms, Nicolas, 2022. "Insights into multistep depressurization of CH4/CO2 mixed hydrates in unconsolidated sediments," Energy, Elsevier, vol. 260(C).
    2. Shi, Lingli & Li, Junhui & He, Yong & Lu, Jingsheng & Long, Zhen & Liang, Deqing, 2023. "Memory effect test and analysis in methane hydrates reformation process," Energy, Elsevier, vol. 272(C).
    3. Wang, Xiaolin & Zhang, Fengyuan & Lipiński, Wojciech, 2020. "Research progress and challenges in hydrate-based carbon dioxide capture applications," Applied Energy, Elsevier, vol. 269(C).

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