Scrubbing The Ferries Clean
Wärtsilä exhaust gas cleaning systems selected for three Norwegian ships
Wärtsilä has been contracted to retrofit its open loop scrubber systems on three additional vessels owned by Color Line, Norway's largest cruise and ferry operator. The new contract covers the company's SuperSpeed I, Color Magic and Color Fantasy ships. The SuperSpeed I sails between Norway and Denmark, while the other two vessels link Oslo, Norway with Kiel, Germany.
Each vessel will be fitted with four systems designed to rid the ships' exhaust gases of harmful sulfur oxide (SOx) and particulate emissions. Wärtsilä said the systems will enable the vessels to comply with current and anticipated environmental legislation and to operate without restrictions in Emissions Control Areas (ECAs).
The system operates in an open loop using seawater to remove SOx from the exhaust – as exhaust gas enters the system it is sprayed with seawater in three different stages. The sulfur oxides in the exhaust react with the water to form sulfuric acid; chemicals are not required since the natural alkalinity of seawater neutralizes the acid.
Wash water from the system is treated and monitored at the inlet and outlet to ensure that it conforms to all applicable discharge criteria. It can then be discharged into the sea with no risk of harm to the environment, the company said.
In addition to the equipment delivery, Wärtsilä has also assumed responsibility for the basic and detailed engineering and for the installation supervision.