Wartsila 31 Product Manual page 123

Wärtsilä 31 Product Guide
Sulphur Oxides, SO
Marpol Annex VI has set a maximum global fuel sulphur limit of currently 3,5% (from 1.1.2012)
in weight for any fuel used on board a ship. Annex VI also contains provisions allowing for
special SOx Emission Control Areas (SECA) to be established with more stringent controls on
sulphur emissions. In a SECA, which currently comprises the Baltic Sea, the North Sea, the
English Channel, the US Caribbean Sea and the area outside North America (200 nautical
miles), the sulphur content of fuel oil used onboard a ship must currently not exceed 0,1 %
in weight.
The Marpol Annex VI has undertaken a review with the intention to further reduce emissions
from ships. The current and upcoming limits for fuel oil sulphur contents are presented in the
following table.
Table 12-2
Fuel sulphur cap
Max 3.5% S in fuel
Max. 0.1% S in fuel
Max. 0.5% S in fuel
Abatement technologies including scrubbers are allowed as alternatives to low sulphur fuels.
The exhaust gas system can be applied to reduce the total emissions of sulphur oxides from
ships, including both auxiliary and main propulsion engines, calculated as the total weight of
sulphur dioxide emissions.
Wärtsilä 31 Product Guide - a1 - 18 October 2016
The Dual Fuel engines fulfil the IMO Tier 3 NOx emission level as standard in gas
mode operation without the need of a secondary exhaust gas emission control
system.
emissions
x
Fuel sulphur caps
Area
Globally
SECA Areas
Globally
NOTE
Date of implementation
1 January 2012
1 January 2015
1 January 2020
12. Exhaust Emissions
12-5