Efficient hydrate-based carbon capture system enabled by red blood cell inspired encapsulation

Yuxuan Zhang, Zhongbin Zhang, Yuerui Lu, Benjapon Chalermsinsuwan, Fei Wang, Hailin Zhang and Xiaolin Wang

Applied Energy, 2024, vol. 359, issue C, No S0306261924001673

Abstract: Encapsulation is an effective method to improve gas-liquid mass transfer and accelerate gas hydrate formation kinetics. However, the utilisation of encapsulation in the hydrate-based carbon capture (HBCC) system has never been implemented. In this work, an efficient HBCC unit based on the red-blood-cell (RBC) inspired encapsulation was designed for the first time, and its carbon capture performance were experimentally investigated. A validated numerical model was developed to investigate the impact of capsule layouts and capsule size on hydrate formation kinetics. Furthermore, we proposed a close-packing configuration of RBC capsules based on the natural structure of beehives, in which the space utilisation rate of capsules can achieve 64.3%. The CO2 capture performance of this configuration was examined in both a closed system and an open system under different pressures. For a closed system, a trade-off between water-to-hydrate conversion rate and average CO2 uptake per space volume was observed. The highest attainable water-to-hydrate conversion rate, reaching 88.5%, is realized at an initial pressure of 4.5 MPa, concomitant with an average CO2 uptake per unit space volume of 6.12 mol min−1 m−3. For an open system, both high water-to-hydrate conversion rate and CO2 uptake efficiency per unit volume can be achieved even at low operating pressures.

Keywords: Hydrate-based carbon capture; Red blood cell; Hydrate formation kinetics; Heat and mass transfer; Close-packing (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.122784

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