Evolving environmental regulations are affecting residual fuel quality and the International Maritime Organisation has requested the International Organisation for Standardisation to consider this for the revision of ISO 8217, the global marine fuel standard. Driven by developments in refining and bunkering technology, as well as stricter emissions regulations and the growing emphasis on fuel sulphur content, the composition of residual fuel oils is changing. Independent fuel testing agencies have documented certain fuel quality problems as being more prevalent in low sulphur fuel oil (LSFO) than in traditional high sulphur fuel oil (HSFO) used by ships. It has been observed that LSFO may have increased content of catalyst fines, a tendency to augmented sludge formation, a longer ignition delay and poor combustion properties. This appeared to be more so for some ports and areas than others. The effects of a fuel with poor ignition and combustion properties can range from difficulties in starting or even failure to start-up an engine, heavy knocking, increased post-combustion deposits leading to wear and tear, increased emissions, and potentially more soot and particulate matter due to incomplete fuel combustion. Fuel combustion characteristics (ignition delay, combustion period, maximum combustion pressure, and rate of maximum heat release) vary between different fuel fractions (fuel cuts). These in turn are affected by a variety of factors, including density, kinematic viscosity, carbon residue, asphaltene content, aromaticity, carbon/hydrogen (C/H) ratio, paraffinic carbon content and others. Although ISO8217 covers many quality aspects of marine fuels, the ignition and combustion performance evaluation of residual fuel oils is still not standardised. By studying the combustion characteristics using various bench testing techniques (Fuel Combustion Analyser-FCA, Thermo Gravimetric Analysis-TGA and Pressure Differential Calorimetry-DSC), it is possible to understand the combustion properties of different fuel fraction combinations. One of the more straightforward options of improving the performance of fuels with poor combustion properties is the use of fuel additives. Using an appropriate fuel additive, such as a combustion improver, can help prevent engine damage and reduce emissions. Additionally, understanding the response of the various fuel fraction compositions to the fuel additives will allow the appropriate selection of a marine fuel additive to improve combustion. This paper will report the findings on the combustion properties of various fuel fraction combinations and the response of these fuel fraction combinations to the use of a marine combustion improver additive.


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    Titel :

    Characterisation of residual fuel oil combustion properties and the appropriate selection of marine fuel additives to improve combustion


    Beteiligte:
    Vermeire, Monique (Autor:in) / Audoire, Louise (Autor:in) / Ang, Winson (Autor:in)


    Erscheinungsdatum :

    2010


    Format / Umfang :

    13 Seiten, 9 Bilder, 3 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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