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Impact of natural gas quality on engine performances during a voyage using a thermodynamic fuel system model

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  • Thiaucourt, Jonas
  • Marty, Pierre
  • Hetet, Jean-François

Abstract

Liquefied Natural Gas (LNG) as a fuel is seen as a solution to curb harmful emissions in shipping and its quick uptake is now significant. As heat leaks into the LNG fuel tanks, composition of the vapor and liquid phase change. This process, known as ageing, alters the fuel properties and can impact negatively the main engine performance. In this paper, a dynamical model to assess the methane number at engine inlet from the bunkered composition is presented. The fuel system is made of a 40 ft container tank and two heat exchangers. The model considers the two-phase real mixture in the tank and solves explicitly the heat and mass conservation laws. Then a strategy is developed to avoid “off-spec” methane number at engine inlet. The approach is tested on two bunkered compositions, one from Libya and one from Australia. The simulations have been conducted for a concept LNG/wind electric ship using multiple removable 40 ft container LNG tanks. Results show that with the proposed mixing strategy, the methane number remains above its limit value at engine inlet, insuring optimal operating conditions of engines.

Suggested Citation

  • Thiaucourt, Jonas & Marty, Pierre & Hetet, Jean-François, 2020. "Impact of natural gas quality on engine performances during a voyage using a thermodynamic fuel system model," Energy, Elsevier, vol. 197(C).
    • Handle: RePEc:eee:energy:v:197:y:2020:i:c:s0360544220303571
    DOI: 10.1016/j.energy.2020.117250
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    References listed on IDEAS

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    1. Migliore, Calogero & Salehi, Amin & Vesovic, Velisa, 2017. "A non-equilibrium approach to modelling the weathering of stored Liquefied Natural Gas (LNG)," Energy, Elsevier, vol. 124(C), pages 684-692.
    2. Miana, Mario & Hoyo, Rafael del & Rodrigálvarez, Vega & Valdés, José Ramón & Llorens, Raúl, 2010. "Calculation models for prediction of Liquefied Natural Gas (LNG) ageing during ship transportation," Applied Energy, Elsevier, vol. 87(5), pages 1687-1700, May.
    3. Huerta, Felipe & Vesovic, Velisa, 2019. "A realistic vapour phase heat transfer model for the weathering of LNG stored in large tanks," Energy, Elsevier, vol. 174(C), pages 280-291.
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    1. Kalikatzarakis, Miltiadis & Theotokatos, Gerasimos & Coraddu, Andrea & Sayan, Paul & Wong, Seng Yew, 2022. "Model based analysis of the boil-off gas management and control for LNG fuelled vessels," Energy, Elsevier, vol. 251(C).

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