I'm looking for reference and formulae widely used for calculating emission of NOx and SOx in marine diesel engine, medium speed mainly
The SOx emission depends on the sulfur content of the oil and not on the load of the engine. Hence you can calculate this easily with a mass balance. For NOx you will need a suitable model for the combustion process which is more difficult to deduce. At least you can look for some data in the literature to get an idea of how many NOx approximately you will have.
Buenos días, Fernando:
Tienes valores de referencia de factores de emisión en el tercer informe de la OMI sobre gases de efecto invernadero, a partir de la página 287. En particular, los de NOx los tienes en la página 290, en función del tipo de combustible, en gramos de NOx emitido / gramos de combustible. Las cifras ahí presentadas son valores promedio estimados de la flota mundial. Hay previsiones de futuro, pero los valores estimados para 2012 te pueden servir como una referencia
http://www.imo.org/en/OurWork/Environment/PollutionPrevention/AirPollution/Documents/Third%20Greenhouse%20Gas%20Study/GHG3%20Executive%20Summary%20and%20Report.pdf
Saludos
You need to know the power consumption of your ship as function of the speed.
Next you need to know the fuel consumption of your engines in those conditions and the product gives you the fuel consumption per unit time or (after division by the speed) per unit distance sailed.
The SOx emissions depend entirely on the amount of sulfur in the fuel.
The amount of NOx is engine specific, but are usually close to the limits imposed by IMO. In emission control areas, NOx emissions limits are 3,5 g/kWh for low speed engines and gradually decrease to some 2 g/kWh for high speed engines.
Of course there is a load dependency. For diesel engines, NOx emissions per g fuel consumed typically decrease for increasing power consumption.
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