Liquid Natural Gas (LNG) carriers have, as the only type of commercial vessel, maintained the steam turbine as their preferred propulsion system whereas all other types of commercial ships as a consequence of the rising fuel prices and environmental awareness changed to the more efficient diesel engines. The LNG carrier has maintained the steam turbine as its propulsion system because the natural evaporated boil-off gas from the cargo is available anyway and because no other solution for the use of boil-off gas has been available. The reliquefaction of the boil-off gas from the LNG cargo makes it possible to increase the cargo quantity delivered to the customers, instead of using it as fuel, and to install the more efficient two-stroke diesel propulsion systems on LNG carriers. The economical advantage per LNG-carrier would be more than 3,000,000 US-Dollar. Reference is made to the LNG market situation and the transport conditions of LNG in the tanks. LNG on the LNG carrier is kept liquid at -163 deg C by natural boil-off.The boil off gas can be used in the boiler for production of some of the steam required for ship propulsion.There are two ways of handling the boil-off gass, either it can burnt in a boiler, gas turbine or dual fuel diesel engine and provide power for the propulsion of the vessel or it can be reliquefied in a reliquefaction system and returned to the cargo tanks. This paper is focussed on the latter method, where all of the loaded LNG cargo can be delivered to the customer. This method has both economical and technical advantages, compared with the normal steam turbine propulsion. However, MAN B&W Diesel can also offer engines and gas turbines for propulsion systems where the boil-off gas is still used as fuel (in form of a dual-fuel two-stroke diesel engine or a COmbined Diesel engine And Gas turbien (CODAC) electrical propulsion system. The advantages of reliquefaction and diesel engines are desribed and examples of MAN diesel propulsion plants adapted to LNG carriers are shown.


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    Titel :

    Two-stroke diesel engine and reliquefaction systems for LNG carriers


    Weitere Titelangaben:

    Zweitakt-Dieselmotor und Rückverflüssigungssysteme für LNG-(Liquid Natural Gas) Tankschiffe


    Beteiligte:
    Skjoldager, P. (Autor:in) / Lunde, T. (Autor:in) / Melaaen, E. (Autor:in)


    Erscheinungsdatum :

    2003


    Format / Umfang :

    21 Seiten, 15 Bilder, 6 Tabellen


    Anmerkungen:

    (nicht paginiert)


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch







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