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Journal of KONES

Tytuł artykułu

The total NOx emission control possibility in modern large bore, slow speed marine engines

Autorzy Borkowski, T. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN The common demands for environmental protection in shipping are being recognized by IMO, through development of the rules with respect to SOx and NOx. This paper investigates the results of fuel injection variables, affecting cylinder process performance and exhaust gas emission. The effect of injection assembly design attributed on NO emission was estimated. The similar slow speed, large bore MAN B&W engines performance were compared. The main factors used for evaluation were: fuel consumption, rotational speed, mean and maximum in-cylinder pressures and total concentrations of NOx, CO2, O2i CO, and HC. The engines performance and NO emission were compared with conventional 6S60MC-C and latest — electronically controlled 7S60ME-C. The CFD simulation of combustion and pollutant formation was created to represent processes of a marine large bore engine. The SMC-C engine operation and standard injection nozzle design was taken as a baseline for comparison with measured NO concentration. The predicted cylinder pressures showed reasonable agreement with experimental measurements. The predictive ability of used CFD simulation package was found to be quantitatively insufficient in terms of NOx emission. However, the predicted NO emission exhibits similar sensitivity with experiment results. The quantitative set of reference data for the validation of simulation results needs to be substantially improved. The determination offuel injection and cylinder pressure history can be identified as the most important source of inaccuracy. Finally, weighted NOx specific emission factor for both engines shows close value, sufficiently placed against IMO limit presented in Fig. 11. The results are promising and show that controlled combustion process is capable of fulfilling present and future NOx emission requirements. Modern marine engines are designed with adjustable components to allow the engine to be adjusted for maximum efficiency or NOx weighted emission factor when used in particular application.
Słowa kluczowe
EN marine diesel engine   injection assembly   exhaust emission  
Wydawca Institute of Aviation
Czasopismo Journal of KONES
Rocznik 2008
Tom Vol. 15, No. 2
Strony 21--28
Opis fizyczny Bibliogr. 4 poz., rys.
autor Borkowski, T.
  • Maritime University Waly Chrobrego Street A, 70-500 Szczecin, Poland tel.: +48 91 4809400, fax: 48 91 4809575,
[1] Ishida, H., T., T., Osafune, S., Iwamoto, K., Ono, S., Takasaki, K., Improvement Of Heavy Fuel Oil Combustion,, Using a Stratified Fuel Injection System, CIMAC, 2001.
[2] Danckert, Ways of nozzle geometry optimisation for new injection systems, fulfilling future emission limits, CIMAC, 2001.
[3] Krupa, A., State of the art electronically controlled engines. Combustion Engines, PTNSS, 2004.
[4] Borkowski, T., The Effect of Cylinder Process Variation on Total Nitrogen Oxides Emission of Large Bore, Slow Speed Marine Engines, CIMAC, 25th World Congress,Vienna, 2007.
Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-article-BUJ8-0001-0003