scrubber system comprises two scrubber units, which Wärtsilä says enables great
flexibility and cost savings when operating at different operational settings.
In all, 28 MW of total power output will be handled by the Wärtsilä system. The
system is designed to clean the sulphur oxide (SOx) and particulates from the
ships will be operating at times in harsh climatic conditions and Wärtsilä has
considerable experience in developing scrubber systems technology for use in
challenging marine environments. The system is optimised to give the necessary
flexibility in relation to the ships' operations, with special emphasis given
to minimising the operational costs," said Sigurd Jenssen, director,
Exhaust Gas Cleaning, Wärtsilä Ship Power.
design incorporates a cleaning system for the scrubbing wash water, which is
said to ensure the eventual discharge water is well within the regulatory
limits. Special care has also been given in the design to allow the systems to
operate for extended periods with zero discharge of the effluent scrubbing
water – an important advantage when the vessels are operating in environmentally
Wärtsilä Hybrid Scrubber Systemsenable the use of either closed or open loop technology to remove SOx
from the exhaust. When operating in open loop mode, exhaust gases enter the
system and are sprayed with seawater. Chemicals are not required since the
natural alkalinity of seawater reacts with the sulphur and cleanses it from the
exhaust gas. When operating in closed loop mode, sodium hydroxide (NaOH) is
added to the seawater as an alkali. The hybrid approach enables operation in
closed loop mode when required, for instance when entering zero discharge areas
or where the seawater alkalinity is low, and elsewhere the switch can be made
to open loop using only seawater.
will provide engineering and consulting support during the installation, while
the company's global service network will ensure ongoing technical support
throughout the lifecycle of the vessels.
systems are scheduled for delivery in December 2015.