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Numerical analysis on the boil-off rate of liquefied natural gas in MARK III FLEX tank systems of LNG carriers.

Auteurs : WANG M., HAN H., XU C., XIAO Y., JING X., CUI J., LI Y., ZHU J.

Type d'article : Article de la RIF

Résumé

Reliable prediction of the thermal performance of cargo containment systems is critical for the safe operation and economic efficiency of LNG carriers. This study employed 3D numerical simulations to investigate the heat transfer rate and evaporation characteristics of MARK III FLEX type LNG cargo tanks. By accounting for com posite material layers and auxiliary structural components, a modified equivalent thermal conductivity model for the insulation layer was established, and a segmentation modeling strategy was utilized to resolve multi-scale computation challenges. On this basis, the heat transfer characteristics under International Code for the Con struction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC) and United States Coast Guard (USCG) standards were comparatively analyzed, and a sensitivity analysis of primary insulation thickness reduction was conducted. Results indicate that the modified model effectively rectifies the underestimation of heat leakage inherent in simplified homogeneous models. The predicted total heat transfer rate and BOR for the entire carrier are corrected to 301,470 W and 0.0678%/day, respectively, reducing the prediction deviation of the heat transfer rate and evaporation rate to 8.36%. Furthermore, under USCG low-temperature conditions, both total heat transfer rate and BOR decrease by 24.72% compared to IGC conditions. Finally, sensitivity analysis of primary insulation thickness reduction to 300 mm indicates a 30.89% increase in heat transfer rate, resulting in an additional daily LNG evaporation loss of 11.85 tons. This study provides a scientific basis for thermal man agement optimization and safety assessment of LNG carriers.

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Pages : 12

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Détails

  • Titre original : Numerical analysis on the boil-off rate of liquefied natural gas in MARK III FLEX tank systems of LNG carriers.
  • Identifiant de la fiche : 30034846
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 187
  • Date d'édition : 07/2026
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2026.106955

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