Next Generation High Effective DeNOₓ Exhaust Aftertreatment – Ultra Compact SCR Dosing System for Close Coupled SCR Applications

Authors

Dipl.-Ing. W. Maus, Dipl.-Ing. R. Brück,
Dipl.-Ing. K. Müller-Haas, Dipl.-Ing. R. Konieczny, Emitec GmbH, Lohmar

Year

2012

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 735

Summary

Selective catalytic reduction (SCR) of nitrogen oxides is a process that has been used successfully in power plants for decades. The first commercial vehicle test fleets with Siemens SinNOx technology were tested almost 20 years ago. However, automotive SCR systems did not enter serial production for another 15 years because improved engine designs were able to meet emission limits even without exhaust aftertreatment. SCR technology was initially used only in EU V commercial vehicles but has now also found application in non-road mobile machines (NRMM), that is, tractors and construction equipment, and in passenger cars. The reducing agent is a standardised urea/water solution (AdBlue). SCR systems usually consist of a reducing agent tank with an extraction pipe, a pump module and an injector. The precise amount of reducing agent that has to be injected into the exhaust system is determined either directly by the engine management or by a separate control unit.

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