Analysis of lacquer deposits and plugging found in field-tested EGR coolers

Michael J. Lance, John Storey, Sam Lewis, C. Scott Sluder

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

All high-pressure exhaust gas recirculation (EGR) coolers become fouled during operation due to thermophoresis of particulate matter and condensation of hydrocarbons present in diesel exhaust. In some EGR coolers, fouling is so severe that deposits form plugs strong enough to occlude the gas passages thereby causing a complete failure of the EGR system. In order to better understand plugging and means of reducing its undesirable performance degradation, EGR coolers exhibiting plugging were requested from and provided by industry EGR engineers. Two of these coolers contained glassy, brittle, lacquer-like deposits which were analyzed using gas chromatography-mass spectrometry (GC-MS) which identified large amounts of oxygenated polycyclic aromatic hydrocarbons (PAHs). Another cooler exhibited similar species to the lacquer but at a lower concentration with more soot. The authors propose that lacquer deposits form when oxygenated PAHs present in the exhaust condense on the cooler walls subsequently experience nitric acid catalyzed polymerization in the presence of aldehydes. A fourth cooler contained large amounts of oil which likely originated from a failed lubricant seal. In light of these results, recommendations for preventing plugging of EGR coolers are suggested.

Original languageEnglish
JournalSAE Technical Papers
Volume1
DOIs
StatePublished - 2014
EventSAE 2014 World Congress and Exhibition - Detroit, MI, United States
Duration: Apr 8 2014Apr 10 2014

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