Hybrid Scrubbers enable 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. The sulphur oxides in the
exhaust react with the water to form sulphuric acid. Chemicals are not required
since the natural alkalinity of seawater neutralizes the acid. When operating
in closed loop mode, the natural alkalinity of seawater is boosted by an
hybrid approach enables operation in closed loop mode when required, for
instance whilst in port and during manoeuvring using NaOH as a buffer. When at
sea, the switch can be made to open loop using only seawater.
installing Wärtsilä scrubber systems, Balticborg
and Bothniaborg will comply with the
regulations covering SOx emissions while using conventional residual marine
Balticborg and Bothniaborg are employed
on a long term freight contract with Smurfit Kappa for the weekly shipment of
paper products between Haraholmen, Bremen, Sheerness and Terneuzen. These
operating routes fall within the Baltic and North Seas' Sulphur Emission
Control Areas (SECA).
The vessels will be retrofitted with the systems in autumn of this year.