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Combining GTL fuel, reformed EGR and HC-SCR aftertreatment system to reduce diesel NO x emissions. A statistical approach

Combining GTL fuel, reformed EGR and HC-SCR aftertreatment system to reduce diesel NO x emissions. A statistical approach

Authors :
Rodríguez-Fernández, J.
Tsolakis, A.
Cracknell, R.F.
Clark, R.H.
Source :
International Journal of Hydrogen Energy. Mar2009, Vol. 34 Issue 6, p2789-2799. 11p.
Publication Year :
2009

Abstract

Abstract: An ultra-low sulphur diesel (ULSD) fuel and a synthetic gas-to-liquid (GTL) fuel, besides different types of standard and reformed EGR, were evaluated in a single-cylinder, direct injection, diesel engine equipped with hydrocarbon-selective catalytic reduction (HC-SCR) aftertreatment system. The results obtained were statistically analysed (at 95% statistical significance) to identify the most significant factors that affect NO x emissions and to search for the optimum operation conditions in order to minimize these emissions. For that purpose, a fully crossed factorial experimental design was used, including two different engine speeds (1200 and 1500rpm), two engine loads (25% and 50%), and four EGR/REGR ratios (0%, 10%, 20% and 30%) resulting in almost one hundred tests. An optimal combination of fuel type, REGR type and REGR ratio was proved to reduce around 89–95% of the reference NO x emissions. In general, at 25% engine load GTL fuelling combined with the reformed EGR with the highest hydrogen content was found the most desirable, as the hydrogen sharply increased the NO x conversion in the SCR catalyst. Differently, at 50% load standard EGR was sufficient to reach high NO x reductions. These findings may be used for the implementation of a system on-board capable to switch from EGR to REGR, which will help engine manufacturers to meet the future emission regulations. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03603199
Volume :
34
Issue :
6
Database :
Academic Search Index
Journal :
International Journal of Hydrogen Energy
Publication Type :
Academic Journal
Accession number :
37182238
Full Text :
https://doi.org/10.1016/j.ijhydene.2009.01.026