Combustion engine emissions of vehicles under real drive condition require special attention. Since the implementation of Euro 4 technology for commercial vehicles in 2005, the SCR technology has been established for NOx reduction worldwide. Traditionally, the reduction agent NH3 is generated from aqueous urea solution (AdBlue/DEF) in the exhaust line upstream of the SCR catalyst. In contrast to the technology described in this paper, this generation happens within a separate reactor, which is decoupled from the exhaust line. Here, the thermal energy required is induced via partial exhaust flow and an electrically heated hydrolysis catalyst. Therefore, the NH3 can be generated widely independent from the exhaust temperature and mixed in the main exhaust line with the exhaust gases short way upstream of the SCR catalyst. As a result, when using low-temperature active catalysts, this technology yields particularly high NOx conversion rates for new engine developments as well as for retrofit applications and convinces with an outstanding real drive emission level. Some aspects of the development of components and systems are described. Furthermore, the verification is shown with engine test bench WHTC using a retrofitted four-cylinder diesel engine.
NH3 Generator for Enhanced Low-Temperature SCR Performance; An Option also for Retrofit
Lect. Notes Electrical Eng.
2014-12-20
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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