Wärtsilä NOx Reducer (NOR)

The Wärtsilä NOx Reducer (NOR) is an emission after-treatment system based on the Selective Catalytic Reduction (SCR) technology for Nitrogen Oxide (NOx) reduction. The system is compliant with various NOx emission reduction needs, such as the IMO Tier III rules.

The NOR is optimized and validated for Wärtsilä medium speed engines in terms of reliability, flexibility and size. It is available for both newbuild and retrofits and is compatible for operation on both distillate and heavy fuel oils.

The main component of the NOR installation is the Reactor with a soot blowing unit and the catalyst elements. Other modular essential parts of the NOR system are a Urea pump unit, a Urea dosing unit, an Urea Injection and mixing unit, an Air unit and the Control unit which controls the NOR operation by monitoring engine parameters. For the purpose of easy installation, several auxiliary units are centralized, so that same units can be utilized in case of multiple NOR installations.

    TECHNICAL DIAGRAM
    NOR layout
    • Nordica
      The turnkey project involved the fitting of combined Wärtsilä NOx Reducer (NOR) and Oxidation Catalysts (OXI) to the MSV Fennica and MSV Nordica.

      Nordica

    • Gitte Henning S349
      The vessel is the largest pelagic trawler in the Danish fishing fleet, and the third vessel with the same name that is owned and operated by the Danish fishing company. The propulsion equipment package include a Wärtsilä 9L32 main engine with new design, gear, controllable pitch propeller (CPP), HR Nozzle, Wärtsilä 8L26 auxiliary engine, as well as related equipment – including NOx reducers for both engines. The previous Gitte Henning was also designed by Wärtsilä Ship Design, back in 2008.

      Gitte Henning S349

    • Arctia Offshore
      First turnkey NOR retrofit on arctic vessels. Arctia Offshore contracted Wärtsilä to install emission reduction systems on board MSV Fennica and MSV Nordica multipurpose icebreakers in 2011. "Our icebreakers can now operate sustainably in the Arctic Ocean. Thanks to Wärtsilä’s technology for exhaust gas cleaning, our vessels are able to continue their sustainable heavy machinery operations in this sensitive environment", says the Arctia Offshore representative.

      Arctia Offshore

    Related press releases

    Articles

    The Wärtsilä NOx Reducer for IMO Tier...

    The Wärtsilä NOx Reducer represents the latest in emission abatement technology. It offers ship owners...
    29 October 2014
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