Energy consumption and atmospheric emissions
At the end of 2014 all of Viking Line’s vessels, except for the Viking Grace, switched to diesel oil with a sulphur content of less than 0.1 per cent by weight in order to meet the requirement of the European Union´s new sulphur directive, which went into effect on January 1, 2015. The Viking Grace runs on liquefied natural gas (LNG), which is free of sulphur.
Until then, the vessels in question operated on low-sulphur oil with 0.5 per cent content by weight in order to reduce sulphur oxide (SOx) emissions.
To decrease nitrogen oxide emissions, reduction technology is used on two of Viking Line’s vessels – catalytic converters on the Viking Cinderella and humid air motor (HAM) technology on the Mariella.
Humid Air Motor (HAM)
A technology that reduce nitrogen oxide emissions by lowering the combustion temperature of vessel engines. This is achieved by adding vaporized seawater to the combustion process.
Selective catalytic reduction (SCR)
A process that transforms nitrogen oxides into pure nitrogen gas and water vapour. A catalyzer used on a ship normally uses liquid urea as an additive (urea consumption about 15g/kWh).
Viking Line has an internal programme to reduce exhaust gas emissions. In this programme, vessel operating staff and the Company’s technical department are working to introduce fuel-efficient methods of manoeuvring vessels.
M/S Gabriella and M/S Mariella use shore-side electricity while at port at Stockholm and Helsinki. Shore-side electricity reduces emissions of air pollutants and engine noise while the ships are at port.