‘Real Sailing Emissions’ for maritime vessels using sensors and satellite data transmission
van Heesen, D.
Exhaust emissions of maritime vessels are becoming increasingly important due to their contribution to air pollutant concentration on land, especially in port areas. For this reason, Emission Control Areas (ECA) were introduced in Europe to reduce SOx emissions. This has been expanded to more stringent NOx regulations for new vessels in 2021. The EU H2020 SCIPPER project was set-up to study various possibilities for monitoring and enforcement of pollutant emissions from vessels, and how this would contribute to the air quality in port areas. This paper reports on onboard monitoring options, data formats and metrics and continuous data transmission via satellite. Several onboard emissions monitoring systems, built around low costs sensors, have been constructed for this purpose. The sensors include NOx, NO2, SO2, NH3, PM and BC, so have a broader scope than just supporting legislative requirements. Regarding the monitoring strategy, it is proposed to monitor ‘Real Sailing Emission’ (RSE) rather than mimicking the formal E3 cycle. It is also proposed to use as few as possible parameters for this monitoring. Basically exhaust gas concentrations (ratio of pollutant with CO2) in combination with a pre-set break-specific fuel consumption (BSFC) is sufficient for good monitoring. For NOx, the Not To Exceed (NTE) limit (max 150% of E3 cycle average) is seen as the most practical requirement for this monitoring. A simple and robust data format has been defined which is suitable for satellite data transmission. By transmitting ratios of pollutants with CO2 (in exhaust gas), the transmission can handle different type of sensor signals with a good accuracy. For example, raw and diluted concentrations can be handed with the same accuracy.
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Mobility & Logistics
Institute for Internal Combustion Engines and Thermodynamics of Graz, University of Technology, Graz
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