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Document IIF

Conception et évaluation thermodynamique de systèmes de reliquéfaction de gaz d’évaporation embarqués fonctionnant au NH3 pour les transporteurs océaniques alimentés au NH3.

Design and thermodynamic evaluation of onboard NH3 BOG re-liquefaction systems for ocean-going NH3 carriers.

Auteurs : JI S., PARK S., SEO Y., CHOI M., LEE J.

Type d'article : Article de la RIF

Résumé

This study stems from the burgeoning interest in ammonia (NH3) as a green energy source, particularly for maritime applications where conventional refrigeration cycles pose both environmental and economic challenges, specifically focusing on an 88,000 m3 class Very Large Ammonia Carrier (VLAC). Two distinct refrigeration cycle concepts were evaluated for the re-liquefaction system. The optimization technique used in the study was a hybrid method that combined the SQP and BOX algorithms to optimize the system. Key process variables were set to the final compression and expansion pressures of the refrigeration cycle, which were optimized to minimize the specific energy consumption (SEC) of the systems. An economic analysis was conducted to assess the costs associated with the equipment used in both systems. The first optimized re-liquefaction system employs a vapor-compression refrigeration cycle using NH3 as the refrigerant. The thermodynamic analysis indicated energy consumption, SEC, and exergy efficiency of 112.44 kW, 0.1898 kWh/kg, and 38.31 %, respectively. The second system utilizing the Linde–Hampson refrigeration cycle demonstrated energy consumption, SEC, and exergy efficiency of 102.35 kW, 0.1728 kWh/kg, and 43.03 %, respectively. Exergy destruction within these systems was predominantly observed in the heat exchangers, accounting for 43.00 % and 51.80 % of the total exergy destruction, respectively. Economic analysis revealed that the life cycle cost (LCC) and sensitivity analysis of the re-liquefaction system using the Linde-Hampson refrigeration cycle are approximately 2.0 million USD lower than the system using the vapor compression refrigeration cycle. In conclusion, the Linde-Hampson re-liquefaction system is energy efficient and economical.

Documents disponibles

Format PDF

Pages : 399-411

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 : Design and thermodynamic evaluation of onboard NH3 BOG re-liquefaction systems for ocean-going NH3 carriers.
  • Identifiant de la fiche : 30033487
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 170
  • Date d'édition : 02/2025
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2024.12.005

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