Abstract
According to the International Council on Combustion Engines (CIMAC) and International Maritime Organization (IMO) statistics, the rational selection of Marine Bunker Fuel (MBF) properties is an effective way to improve operating conditions and energy efficiency of all types of marine Diesel Engines (DEs). The publication presents the results of studies on the influence of heavy and distillate MBF properties on the characteristics of different DE types: high-speed (Caterpillar 3512B, MTU 8V 396TB), medium-speed (SKL VDS 48/42, ChN 26.5/31) ir low-speed (MAN B&W 6S60MC). The aim of work is to form a methodological framework for assessing the influence of marine fuel properties on the energy performance of different types of ship power plants. Numerical methods show that in the case of unfavourable selection of the density and viscosity of marine fuels regulated by the standard ISO 8217:2017, the changes in specific fuel consumption be reach up to 10% low-speed, 4…7% medium-speed, and 2…3% high-speed DEs. As the density varies from light grades to 1010 kg/m3, the change in be is 3…4%. At low viscosity, as the density increases to 1030 kg/m3, the low-speed engine comparative fuel consumption increases by 5%. It is recommended not to use fuel with a density >1010 kg/m3 and a viscosity <300…400 mm2/s. Developed solutions for the rational selection of bunkered marine fuel properties for a specific DE model trough the influence of density and viscosity on fuel injection and combustion characteristics based on multiparametric diagrams of relative fuel consumption change.
Highlights
Increasing energy efficiency and reducing environmental pollution have become key components of sustainable transport development (EC 2011)
Numerical methods show that in the case of unfavourable selection of the density and viscosity of marine fuels regulated by the standard ISO 8217:2017, the changes in specific fuel consumption be reach up to 10% low-speed, 4...7% medium-speed, and 2...3% high-speed Diesel Engines (DEs)
A study that analysed diesel fuel properties influence on engine performance found that there some correlation between fuel density and CN, aromatic HC fraction, heat value and in addition, it was found that CO and HC emissions increase with the increase of fuel density (Liu et al 2018)
Summary
Increasing energy efficiency and reducing environmental pollution have become key components of sustainable transport development (EC 2011). In order to ensure cleaner and greener shipping, in 2011, the IMO extended MARPOL Annex VI and introduced the EEDI for ships (Wilkison 1985; Schobert 2013) between 3000 and 15000 dwt This indicator is intended to encourage ship owners to seek energy efficiency. It is necessary to look for other means of improving the energy efficiency of ships, either by optimising speed or by reducing fuel consumption (Xing et al 2019). At this time most research focused on biofuel – diesel and diesel additives with a goal to reduce harmful pollutant emission and improve efficiency (Labeckas et al 2006; Fayyazbakhsh, Pirouzfar 2017; Maawa et al 2020). In this study fuel – water emulsion droplet evaporation was simulated to better understand and improve injection
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