Our investigation of variable speed operation of turbogenerators, including both single-shaft and twin-shaft variants, shows significant opportunities to improve part-load efficiency in those certain electrical power generation applications that permit variable speed operation. Efficiency improvement increases as load decreases and the improvement is larger for single-shaft engines than for twin-shaft engines. For example, when operating at 20% loading, adjusting the engine speed can improve fuel efficiency by 14% for single-shaft gas turbines, and by 2% for twin-shaft gas turbines. In addition, we present a semi-theoretical analysis that provides a procedure to obtain the gas turbine optimal efficiency and its corresponding optimal speed as a function of shaft load. Simulation results of part-load variable speed modeling of gas turbines further confirmed the theoretical analysis. This has important practical implications. An analysis of fuel consumption by a gas turbine that operates with a load profile representative of a typical propulsion profile for a DDG51 ship, shows a 15% reduction in fuel consumption when variable speed operation is used, as compared to fixed speed operation. In addition, the analysis presented in this paper provides a general method to evaluate the steady-state performance of gas turbines operating with variable speed.


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    Titel :

    Variable speed operation of turbogenerators to improve part-load efficiency


    Beteiligte:
    Li, Dan (Autor:in) / Dougal, Roger A. (Autor:in) / Thirunavukarasu, Eshwarprasad (Autor:in) / Ouroua, A. (Autor:in)


    Erscheinungsdatum :

    2013-04-01


    Format / Umfang :

    1835874 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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