Wärtsilä has received an order from Edda Accomodation, which is part of the Østensjø Group in Norway, to supply six Wärtsilä Nitrogen Oxides Reducer (NOR) units for an accommodation vessel. They will be installed on the six nine-cylinder Wärtsilä 26 generating sets, which were ordered in the end of 2006 in addition to other auxiliary equipment and automation. The vessel is built in Spain and will be delivered in the first quarter 2010. The order marks the opening of Wärtsilä’s Nitrogen Oxides Reducers to the commercial market.
The Wärtsilä NOR units are selective catalytic reduction (SCR) converters that will meet the stringent requirements of IMO Tier III emissions control regulations with regard to NOX reduction. The NOR units are able to reduce NOX emissions to a level of 1.5 g/kWh. IMO Tier III is expected to come into force in 2016.
The new SCR product range caters for the needs of all four-stroke engines in Wärtsilä’s portfolio and can be used for both newbuild and retrofits. The SCR control system is seamlessly integrated with the Wärtsilä engine control system and the units come with a completed prefabricated ancillary system.
Wärtsilä has built up a long field experience in running SCR on its own engines in both power plants and vessels since the early 1990s. Based of this experience Wärtsilä has developed a standard selection of modularized SCRs under the product name of Nitrogen Oxides Reducer (NOR) in close cooperation with a major catalyst manufacturer. The target was to combine efficiency, investment and operation cost.
Artist’s impression of Edda Accomodation’s newbuilding.
NOR users will benefit from the integration of the engine and SCR control systems and the worldwide support of the Wärtsilä network.
Edda Accommodation supplies accommodation services to the offshore oil and gas industry. Measuring 130 m long by 27 m wide, the new vessel will have accommodation for 600 persons when deployed offshore. However if it is moored to a jetty as quarters for onshore workers, the capacity can be increased to 1000 persons.
The accommodation vessel will be suitable for world-wide operations. It might be used in the Gulf of Mexico, West Africa and South-East Asia, but also in areas exposed to inclement weather such as the North Sea, Canada and the northern Pacific. The vessel is also suitable for the transport of personnel to and from offshore installations. For propulsion, manoeuvring and dynamic positioning, the vessel will have seven thruster units powered by the Wärtsilä generating sets, which will also supply the hotel load of the vessel. Transfer of personnel to and from the vessel while on site will be over a telescopic gangway.