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Diesel Emission with DPF+SCR in VERTdePN - Testing & Potentials Univ. of Applied Sciences - Biel
- Format:
- Conference/Event
- Author/Creator:
- Czerwinski, Czerwinski, author.
- Conference Name:
- SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource
- Place of Publication:
- Warrendale, PA SAE International 2011
- Summary:
- The most efficient way and the best available technology (BAT)to radically reduce the critical diesel emission componentsparticles (PM&NP) and nitric oxides (NOx) arecombined exhaust gas aftertreatment systems (DPF+SCR). SCR(selective catalytic reduction) is regarded as the most efficientdeNOx-system, diesel particle filters are most efficientfor soot abatement. Today, several suppliers offer combined systemsfor retrofitting of HD vehicles.The presented results are part of the work in the internationalnetwork project VERT *) dePN (de-activation, de-contamination,disposal of particles and NOx), which has the objectivesto establish test procedures and quality standards and to introducethe SCR-, or combined DPF+SCR-systems in the VERT verificationprocedure.Examples of results for some of the investigated systems aregiven and the most important findings are: - the averageNOx conversion rate at transient operation stronglydepends on the operation load profile, on the exhaust gastemperature and the resulting urea dosing control, - the particlenumber filtration efficiency, which is verified at stationaryengine operation, is valid also at the transient operation, -secondary nanoparticles are produced due to urea injection, theynevertheless do not impact significantly the overall filtrationefficiency of the system (here: DPF upstream and SCR downstream,differences of PCFE in the range of 0.1%), - the OEMNOx-sensors of the investigated systems are appropriatetools for the in-use control, - the system with catalyzed DPF(upstream) attains higher overall deNOx-efficiencies dueto NO₂-production in the DPF, - for the investigated systems thereare no critical emissions of unregulated components, NH₃ andN₂O
- Notes:
- Vendor supplied data
- Publisher Number:
- 2011-01-1139
- Access Restriction:
- Restricted for use by site license
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