The deconvolution of the thermal, dilution, and chemical effects of exhaust gas recirculation (EGR) on the reactivity of engine and flame soot

Khalid Al-Qurashi, Angela D. Lueking, André L. Boehman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

In a recent paper, we demonstrated that the exhaust gas recirculation (EGR) enhanced the oxidative reactivity of diesel engine soot. In this paper, we show that simulated EGR, via carbon dioxide (CO2) addition to the intake air to an engine at concentrations of 0, 2, 4, and 8 vol.% and to the oxidizer stream of an ethylene diffusion flame at concentrations of 0, 5, and 10vol.%, affects the reactivity of the soot in the same manner as actual EGR. Motivated by this fact, post-flame ethylene soot was produced from a co-flow laminar diffusion flame to better understand the mechanism by which the CO2 affects soot reactivity. This objective was accomplished by successfully isolating and examining the thermal, dilution, and chemical effects of the CO2 on soot reactivity. These three effects account for 45%, 35%, and 20% of the total reactivity of soot respectively, with the thermal effect being the most important factor governing the soot reactivity. The results showed that all of these effects account for a measurable increase in soot reactivity.

Original languageEnglish (US)
Pages (from-to)1696-1704
Number of pages9
JournalCombustion and Flame
Volume158
Issue number9
DOIs
StatePublished - Sep 2011

Bibliographical note

Funding Information:
The authors wish to thank the Department of Energy for support under Grant # DE-FC26-03NT41828, the National Science Foundation for support under Grant # CTS-0553339 and the Saudi Ministry of Higher Education for fellowship support for Dr. Al-Qurashi. Thanks are also due to Dr. Allen Kimel in the Penn State Department of Materials Science and Engineering for access to the SDT instrument and to Professor Robert Santoro for providing the co-flow laminar diffusion flame burner used in this study.

Keywords

  • Diesel particulate
  • Exhaust gas recirculation
  • Nanostructure
  • Reactivity
  • Soot oxidation

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy

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