Numerical Investigation of the Back Pressure Influence on Urea-Water-Solution Mixing Performance in Close Coupled SCR System

Rafał Rogóż , Jakub Bachanek , Łukasz Boruc , Andrzej Teodorczyk


The upcoming Euro 6d emission standard puts more even stringent requirements for diesel engine cars, especially in the case of nitrogen oxides (NOx) emission. The most widely used technique to meet tight standards is Selective Catalytic Reduction (SCR) with urea-water-solution (UWS) injection. One of the crucial factors is even ammonia distribution at the catalyst inlet; hence, very often product development is focused around this issue. The product development is supported by both experimental and numerical work. The common approach to measure cross section ammonia distribution on the SCR is using sampling system at catalyst outlet. Very often exhaust layout is opened just after the SCR catalyst, cutting off the rest part for instance tailpipe or Clean-up Catalyst. Therefore, a backpressure at SCR outlet resulting from the downstream part is also eliminated. This could significantly affect flow parameters as the density changes, thus ammonia distribution and wall film deposition may vary as well. Within this work, the influence of the backpressure at SCR outlet on the ammonia distribution and wall wetting was numerically investigated. The simulations were run under various boundary conditions for the Close Coupled SCR architecture. It was shown that depending on the operating point the boundary pressure affects both factors on the different level.
Author Rafał Rogóż (FPAE / IHE)
Rafał Rogóż,,
- The Institute of Heat Engineering
, Jakub Bachanek (FPAE / IHE)
Jakub Bachanek,,
- The Institute of Heat Engineering
, Łukasz Boruc (FPAE / IHE)
Łukasz Boruc,,
- The Institute of Heat Engineering
, Andrzej Teodorczyk (FPAE / IHE)
Andrzej Teodorczyk,,
- The Institute of Heat Engineering
Journal seriesJournal of KONES, ISSN 1231-4005, e-ISSN 2354-0133, (B 14 pkt)
Issue year2018
Publication size in sheets0.5
Keywords in EnglishSCR, urea-water-solution, uniformity, CFD, back pressure
Languageen angielski
Score (nominal)14
ScoreMinisterial score = 14.0, 11-03-2019, ArticleFromJournal
Ministerial score (2013-2016) = 14.0, 11-03-2019, ArticleFromJournal
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.