Wärtsilä NOR

The Wärtsilä Wärtsilä NOR is a NOx Reducer selective catalytic reduction system for marine diesel-engine exhaust. Its purpose is to reduce nitrogen-oxide emissions by dosing a urea-based reagent into the exhaust stream and passing the conditioned gas through catalyst elements. The system is installed in the exhaust line of the connected engine and includes the reactor, dosing equipment, control functions and associated sensors required by the approved installation. It is an NOx after-treatment system rather than a SOx wet scrubber, despite the broader exhaust-gas-cleaning category in the supplied list. Performance depends on suitable exhaust temperature, correct reagent dosing, healthy catalyst elements and accurate engine/exhaust data. The exact catalyst volume, dosing rate, temperature window and certification limits are engine- and installation-specific; refer to the manufacturer documentation for the exact figure.