A comparison of advanced heat recovery power cycles in a combined cycle for large ships

Ulrik Larsen, Oskar Sigthorsson, Fredrik Haglind

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    Abstract

    Strong motivation exists within the marine sector to reduce fuel expenses and to comply with ever stricter emission regulations. Heat recovery can address both of these issues. The ORC (organic Rankine cycle), the Kalina cycle and the steam Rankine cycle have received the majority of the focus in the literature. In the present work we compare these cycles in a combined cycle application with a large marine two-stroke diesel engine. We present an evaluation of the efficiency and the environmental impact, safety concerns and practical aspects of each of the cycles. A previously validated numerical engine model is combined with a turbocharger model and bottoming cycle models written in Matlab. Genetic algorithm optimisation results suggest that the Kalina cycle possess no significant advantages compared to the ORC or the steam cycle. While contributing to very high efficiencies, the organic working fluids possess high global warming potentials and hazard levels. It is concluded that the ORC has the greatest potential for increasing the fuel efficiency, and the combined cycle offers very high thermal efficiency. While being less efficient, the steam cycle has the advantages of being well proven, harmless to the environment as well as being less hazardous in comparison.
    Original languageEnglish
    JournalEnergy
    Volume74
    Pages (from-to)260–268
    ISSN0360-5442
    DOIs
    Publication statusPublished - 2014
    Event26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Guilin, China
    Duration: 16 Jul 201319 Jul 2013
    Conference number: 26

    Conference

    Conference26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
    Number26
    Country/TerritoryChina
    CityGuilin
    Period16/07/201319/07/2013

    Keywords

    • Ship propulsion
    • Heat recovery
    • Organic Rankine cycle
    • Kalina cycle
    • Steam Rankine cycle

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