Scrubbers for Two Stena Line Ferries

Wärtsilä exhaust scrubber systems to achieve
emissions compliance for two Stena Line ferries
Two Ro-Ro vessels owned and operated by Stena Line are to be
retrofitted with Wärtsilä in-line closed-loop scrubber systems.
The scrubbers will be installed on the Stena Transit and Stena
Transporter ferries operating between Hoek van Holland in the
Netherlands and Killingholme in the U.K. The order was placed
with Wärtsilä in December 2014, and the retrofitting is scheduled
to take place in Q4 2015 and Q1 2016.
By installing Wärtsilä scrubber systems, the ferries will comply
with the regulations covering emissions of sulphur oxides (SOx)
while using conventional residual marine fuel (HFO). The
operating routes of these two ferries fall within the North Sea's
Sulphur Emission Control Area (SECA).
This is the first ever order for an in-line closed loop scrubber
system, as the in-line option has earlier only been available
with open loop systems. The compact design of the inline system
saves space and it also facilitates easier and faster
installation, thereby reducing the length of time that the vessel
needs to be out of service for retrofitting.
The Wärtsilä closed loop scrubber system operates so that the
wash water is being circulated within the scrubber. Exhaust gas
enters the scrubber and is sprayed with fresh water that has been
mixed with caustic soda (NaOH). The sulphur oxides in the exhaust
react with this mixture and are thereby neutralized. The cleaned
effluents can be safely discharged overboard without causing harm
to the environment.
As part of this contract Wärtsilä will, in addition to the
scrubbers, also supply engineering support, technical advisor
services, and commissioning of the systems.
Feb 17, 2015