Diesel Exhaust Fluid (DEF) like Adblue® is a urea/water solution injected upstream from the SCR catalyst. Urea decomposes into ammonia (NH3) which acts as reducing agent in the de-NOx reaction process. However, incomplete decomposition of urea can lead to unwanted deposits formation, thereby resulting into backpressure increase, loss of NOx reduction efficiency, and durability issues. The phenomenon is aggravated at low temperatures and can lead to restriction or stop of DEF injection below certain exhaust temperatures.This paper focuses on the influence of the additivation of DEF on deposits formation in a passenger car close-coupled SCR on filter Diesel exhaust line installed in a laboratory flow bench test. The behavior of two different additivated DEF was compared to Adblue® in terms of deposits formation on the mixer and SCRF canning at different temperatures comprised between 240°C and 165°C, and different air flows. The influence of the DEF additivation on the cooling effect of the fluid and the surface temperature of the exhaust line downstream from the injector were also investigated.
The Benefits of Diesel Exhaust Fluid (DEF) Additivation on Urea-Derived Deposits Formation in a Close-Coupled Diesel SCR on Filter Exhaust Line
Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants
International Powertrains, Fuels & Lubricants Meeting ; 2017
2017-10-08
Aufsatz (Konferenz)
Englisch
Microwave-Regenerated Diesel Exhaust Particulate Filter
SAE Technical Papers | 2001
|Microwave-Regenerated Diesel Exhaust Particulate Filter
British Library Conference Proceedings | 2001
|Microwave-regenerated diesel exhaust particulate filter
Kraftfahrwesen | 2001
|Optimized diesel particulate filter system for diesel exhaust aftertreatment
Kraftfahrwesen | 2000
|