Topsoe's retrofit SCR system

Topsoe has developed a sensor-based urea SCR system that can be retrofitted on all types of diesel engine applications to remove NOx in the exhaust.

The retrofit SCR system offers great flexibility because the installation and operation does not require any modification to the engine itself, nor is any kind of mapping of the engine required.

Retrofit SCR features

Topsoe's retrofit SCR system offers a number of unique features

• a total of four sensors measure the actual NOx emission, exhaust flow and temperature of the catalyst 
• Topsoe’s advanced real-time control algorithms continuously calculate the optimum amount of urea solution to inject into the exhaust 
• a digital dosing pump doses the desired amount of urea solution

Focal points

The retrofit SCR system yields a very high NOx conversion in the range of 70-90%.

The complete fluid system operation, valve system and injection nozzle have been carefully designed to avoid problems with urea crystallisation and nozzle clogging, ensuring high reliability and trouble-free operation.

Demonstration experience

Topsoe has vast experience in the demonstration of retrofit diesel engine vehicles, including off-road heavy machinery, on-road trucks, urban buses, trains, and marine applications.