Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration

S. S. Gill, Jose Martin Herreros, A. Tsolakis, D. M. Turner, E. Miller, A. P. E. York

Research output: Contribution to journalArticle

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Abstract

Exhaust gas recirculation (EGR) is currently widely used in commercial diesel engines to provide an effective solution in reducing the levels of nitrogen oxide (NOX) emissions. However, this currently comes at the expense of an exponential increase in particulate matter (PM) emissions resulting directly from the dilution effect (i.e. reduction in oxygen availability), as well as a further penalty arising from the recirculation of the exhaust emissions such as soot and hydrocarbons. In our earlier work it was observed that filtered EGR (FEGR) was able to play a significant role in controlling the soot recirculation penalty and thus improve the overall NOX/soot trade-off. In order to further our understanding of the effect of recirculated exhaust gases and in particular recirculated soot and hydrocarbon (HC), comparisons were made between standard EGR, FEGR and pure nitrogen (N2), a direct cleaner replacement of the exhaust gas. When implementing FEGR, a diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) were introduced into the exhaust to not only filter the soot particulates but reduce the recirculation of HC which can play a role in particulate surface growth. It was observed that the recirculated HC species and soot particles (especially at high load and EGR ratios) play a role in promoting the production and growth of further particles within the combustion chamber. Similarly, by comparing at the same O2 intake concentration as that of FEGR and introducing N2 as the EGR replacement gas, it was possible to correlate the increase in engine-out mass of soot with EGR to the recirculation of soot particles, HC species as well as the presence of H2O and CO2.
Original languageEnglish
Pages (from-to)10400-10408
JournalRSC Advances
Volume2012
Issue number27
DOIs
Publication statusPublished - 6 Sep 2012

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Soot
Exhaust gas recirculation
Nitrogen oxides
Nitric Oxide
Hydrocarbons
Exhaust gases
Particulate Matter
Combustion chambers
Dilution
Diesel engines
Nitrogen
Gases
Availability
Oxygen
Engines
Oxidation
Catalysts

Cite this

Gill, S. S., Herreros, J. M., Tsolakis, A., Turner, D. M., Miller, E., & York, A. P. E. (2012). Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration. RSC Advances, 2012(27), 10400-10408. https://doi.org/10.1039/C2RA21109B

Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration. / Gill, S. S.; Herreros, Jose Martin; Tsolakis, A.; Turner, D. M.; Miller, E.; York, A. P. E.

In: RSC Advances, Vol. 2012, No. 27, 06.09.2012, p. 10400-10408.

Research output: Contribution to journalArticle

Gill, SS, Herreros, JM, Tsolakis, A, Turner, DM, Miller, E & York, APE 2012, 'Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration' RSC Advances, vol. 2012, no. 27, pp. 10400-10408. https://doi.org/10.1039/C2RA21109B
Gill SS, Herreros JM, Tsolakis A, Turner DM, Miller E, York APE. Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration. RSC Advances. 2012 Sep 6;2012(27):10400-10408. https://doi.org/10.1039/C2RA21109B
Gill, S. S. ; Herreros, Jose Martin ; Tsolakis, A. ; Turner, D. M. ; Miller, E. ; York, A. P. E. / Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration. In: RSC Advances. 2012 ; Vol. 2012, No. 27. pp. 10400-10408.
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