Decisive development influences for two and four stroke engines with outputs over 500 kW are the limitations on emissions of NO(x). IMO Tier III sets these for marine diesel engines as well as EPA Tier 4 for the USA. IMO Tier III demands an 80 % reduction in NO(x) compared to IMO Tier 1. To achieve improvements in NO(x) emissions, specific fuel consumption and power density, the Miller Cycle and higher turbocharging efficiencies are enabling technologies. The expected potentials of two-stage turbocharging on large four-stroke engines is a reduction of 70 % of NO(x) and 9 % fuel consumption. In the paper, demands on the stages of two-stage turbocharging are outlined. First applications and experiences by ABB are presented. As a logical complement to two-stage turbocharging variable valve timing is described. This allows the Miller Cycle to be modulated from strong to mild. On gas engines with two-stage turbocharging, variable valve timing allows further increases in engine efficiency or an expanded scope of application.


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    Title :

    Turbocharging future large four-stroke engines


    Contributors:

    Published in:

    Motortechnische Zeitschrift ; 73 , Sonderheft: industrial ; 54-58


    Publication date :

    2012


    Size :

    5 Seiten, 6 Bilder, 8 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    German





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