Particle emissions characterization from a medium-speed marine diesel engine with two fuels at different sampling conditions

L. Ntziachristos, E. Saukko, K. Lehtoranta, T. Rönkkö, H. Timonen, P. Simonen, P. Karjalainen, J. Keskinen

    Research output: Contribution to journalArticleScientificpeer-review

    47 Citations (Scopus)


    Particle emission characteristics for a medium-speed four-stroke marine diesel engine were studied using a variety of sampling systems. Measurements were conducted at 25% and 75% load employing a heavy fuel oil (HFO) and a lighter marine distillate oil. The measurements, especially with HFO, revealed that marine exhaust particles mostly consist of nanometer sized ash particles on which heavy volatile species condense during exhaust dilution and cooling. The soot mode number concentration was low with both fuels tested, in particular when HFO was used. Total particle number emissions ranged in the order of 5.2–6.9 × 1015 per kg of fuel and formed a monomodal size distribution when a porous tube diluter combined with an ageing chamber and operating at low dilution ratio was used for sampling. The levels and size distributions obtained in the lab using a porous tube diluter were similar to the ones reported in the literature studying ship plumes following atmospheric dilution. Lab measurements with ejector-type diluters mostly led to bi-modal distributions that did not well resemble atmospheric size distributions. Moreover, the nucleation mode formed with the ejector diluters was variable in size and concentration. When used with dilution air at ambient temperature, ejector diluters were inappropriate for primary dilution due to clogging.

    Original languageEnglish
    Pages (from-to)456-465
    Number of pages10
    Publication statusPublished - 15 Dec 2016
    Publication typeA1 Journal article-refereed


    • Heavy fuel oil
    • Light fuel oil
    • Marine emissions
    • Particle emissions
    • Soot particles

    Publication forum classification

    • Publication forum level 2

    ASJC Scopus subject areas

    • General Chemical Engineering
    • Fuel Technology
    • Energy Engineering and Power Technology
    • Organic Chemistry


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