Impact of intake CO 2 addition and exhaust gas recirculation on NO x emissions and soot reactivity in a common rail diesel engine

Handle URI:
http://hdl.handle.net/10754/562368
Title:
Impact of intake CO 2 addition and exhaust gas recirculation on NO x emissions and soot reactivity in a common rail diesel engine
Authors:
Al-Qurashi, Khalid; Zhang, Yu; Boehman, André Louis
Abstract:
The impact of intake CO 2 addition and exhaust gas recirculation (EGR) on engine combustion characteristics, NO x emissions, and soot oxidative reactivity was studied in a common rail diesel engine equipped with a cooled EGR system. The engine test results and the heat release analysis show that the reduced flame temperature, induced by the reduction of the oxygen concentration (dilution effect) is the dominant mechanism via which CO 2 and EGR lower NO x emissions in diesel engines. On the other hand, the collected soot from the engine tests was examined for its oxidative reactivity using a thermogravimetric analyzer (TGA). Results show that EGR has a significant effect on soot reactivity and results in higher initial active sites compared to the CO 2 case. We conclude that the reduced flame temperature (thermal effect) which is a consequence of the dilution effect is responsible for the observed increase in soot reactivity. These results confirm observations from our past work on flame soot, which showed that the peak adiabatic flame temperature is the governing factor affecting soot reactivity. These findings imply that driving the combustion concepts toward low temperature is favorable to effectively control engine pollutants, including soot reactivity. © 2012 American Chemical Society.
KAUST Department:
Clean Combustion Research Center
Publisher:
American Chemical Society (ACS)
Journal:
Energy & Fuels
Issue Date:
18-Oct-2012
DOI:
10.1021/ef201120f
Type:
Article
ISSN:
08870624
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorAl-Qurashi, Khaliden
dc.contributor.authorZhang, Yuen
dc.contributor.authorBoehman, André Louisen
dc.date.accessioned2015-08-03T10:02:43Zen
dc.date.available2015-08-03T10:02:43Zen
dc.date.issued2012-10-18en
dc.identifier.issn08870624en
dc.identifier.doi10.1021/ef201120fen
dc.identifier.urihttp://hdl.handle.net/10754/562368en
dc.description.abstractThe impact of intake CO 2 addition and exhaust gas recirculation (EGR) on engine combustion characteristics, NO x emissions, and soot oxidative reactivity was studied in a common rail diesel engine equipped with a cooled EGR system. The engine test results and the heat release analysis show that the reduced flame temperature, induced by the reduction of the oxygen concentration (dilution effect) is the dominant mechanism via which CO 2 and EGR lower NO x emissions in diesel engines. On the other hand, the collected soot from the engine tests was examined for its oxidative reactivity using a thermogravimetric analyzer (TGA). Results show that EGR has a significant effect on soot reactivity and results in higher initial active sites compared to the CO 2 case. We conclude that the reduced flame temperature (thermal effect) which is a consequence of the dilution effect is responsible for the observed increase in soot reactivity. These results confirm observations from our past work on flame soot, which showed that the peak adiabatic flame temperature is the governing factor affecting soot reactivity. These findings imply that driving the combustion concepts toward low temperature is favorable to effectively control engine pollutants, including soot reactivity. © 2012 American Chemical Society.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleImpact of intake CO 2 addition and exhaust gas recirculation on NO x emissions and soot reactivity in a common rail diesel engineen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalEnergy & Fuelsen
dc.contributor.institutionEMS Energy Institute, Pennsylvania State University, 405 Academic Activities Building, University Park, PA 16802, United Statesen
dc.contributor.institution2007 WE Lay Auto Lab, 1231 Beal Avenue, Ann Arbor, MI 48109-2133, United Statesen
kaust.authorAl-Qurashi, Khaliden
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