Exhaust gas recirculation (EGR) cooler fouling has become a significant issue for compliance with NOx emissions standards. This paper reports results of a study of fundamental aspects of EGR cooler fouling. An apparatus and procedure were developed to allow surrogate EGR cooler tubes to be exposed to diesel engine exhaust under controlled conditions. The resulting fouled tubes were removed and analyzed. Volatile and non-volatile deposit mass was measured for each tube. Thermal diffusivity of the deposited soot cake was measured by milling a window into the tube and using the Xenon flash lamp method. The heat capacity of the deposit was measured at temperatures up to 430°C and was slightly higher than graphite, presumably due to the presence of hydrocarbons. These measurements were combined to allow calculation of the deposit thermal conductivity, which was determined to be 0.041 W/mK, only ∼1.5 times that of air and much lower than the 304 stainless steel tube (14.7 W/mK). The main determinant of the deposit thermal conductivity is density, which was measured to be just 2% that of the density of the primary soot particles (or 98% porous). The deposit layer thermal resistance was calculated and compared with estimates of the thermal resistance calculated from gas temperature data during the experiment. The deposit properties were also used to further analyze the temperature data collected during the experiment.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Direct Measurement of EGR Cooler Deposit Thermal Properties for Improved Understanding of Cooler Fouling


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Sluder, C. Scott (Autor:in) / Wang, Hsin (Autor:in) / Storey, John M. E. (Autor:in) / Lance, Michael J. (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2009



    Erscheinungsdatum :

    20.04.2009




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Diesel EGR Cooler Fouling

    Sluder, C. Scott / Styles, Dan / Hoard, John et al. | SAE Technical Papers | 2008


    Diesel EGR Cooler Fouling

    Hoard, J. / Abarham, M. / Styles, D. et al. | British Library Conference Proceedings | 2008


    Diesel exhaust gas recirculation cooler fouling

    Hoard,J. / Abraham,M. / Styles,D. et al. | Kraftfahrwesen | 2008


    Diesel EGR cooler fouling at freeway cruise

    Mulenga,M.C. / Chang,D.K. / Tjong,J.S. et al. | Kraftfahrwesen | 2009