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Nouveau système de captage du carbone cryogénique à haut rendement énergétique pour les gaz d'échappement des navires fonctionnant au GNL.

Novel fuel-efficient cryogenic carbon capture system for the combustion exhaust of LNG-powered ships.

Auteurs : JIANG Q., DUAN W., LI H., FENG H., DU W., GU J.

Type d'article : Article de la RIF

Résumé

The traditional carbon capture technologies such as alcohol-amine decarburization, membrane separation, etc., are difficult to be used to cope with carbon emissions for ships, due to the power-hungry combustion exhaust pressurization consumption, poor economic benefits of carbon capture, etc. This paper presents a novel cryogenic desublimation CO2 capture system (CDCC) coupled with LNG cold energy for LNG-powered ships. The proposed system not only significantly reduces the energy consumption of exhaust gas boosting but also utilizes waste cold energy from the LNG fuel gas supply system (FGSS). This enables the CO2 gas to condense and separate at low temperatures. Through simulation and parameter optimization, the CO2 capture rate and purity of CO2 product can reach 92.87 % and 96.49 % respectively, with an energy consumption of 5.72 MJ/kg. To evaluate the CDCC performance, the typical monoethanolamine chemical absorption process (MEA) under the same flue gas inlet conditions and the consistent CO2 product outlet temperature and pressure is also simulated. Comparative simulation with the MEA process shows similar CO2 capture rates (87.13 % for MEA and 87.18 % for CDCC), but MEA achieves higher product purity by 2.58 %. However, MEA exhibits significantly higher energy consumption (33.28 MJ/kg) compared to CDCC (5.90 MJ/kg). Investigation into process parameters, engine powers, and CO2 product parameters demonstrates CDCC's robustness in energy consumption, capture rate, and purity. The proposed CDCC system is well-suited for LNG-powered ships, which can be attributed to atmospheric exhaust gas treatment and self-contained utilization of cold energy.

Documents disponibles

Format PDF

Pages : 580-592

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Novel fuel-efficient cryogenic carbon capture system for the combustion exhaust of LNG-powered ships.
  • Identifiant de la fiche : 30032882
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 168
  • Date d'édition : 12/2024
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2024.08.022

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