Studies of soot oxidation on a two-stage burner under fuel-lean conditions

C. A. Echavarria, I. C. Jaramillo, A. Sarofim, J. Lighty

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Soot oxidation by O2 and/or radicals OH∗ and O∗ is one methodology to control soot emissions. The existing relationships for oxidation vary by orders of magnitude. In this work, soot oxidation studies are carried out experimentally in a two-stage burner, where soot is produced in a first-stage premixed burner, while in the second stage, the soot is oxidized under three different fuel lean conditions. Temperature, particles size distributions (PSD), morphology/structure, gas-phase compounds and surface area measurements are being performed to estimate the soot oxidation rates. Results for the leanest ethylene/air flame (Φoverall = 0.8), showed a decrease in particle diameter and an increase in particle number concentration with increasing height above burner (HAB), which indicates fragmentation of the bigger particles, probably due to the higher O2 concentrations, while at higher HAB, the soot oxidation process was dominated by soot burnout as confirmed by particle size distribution and TEM measurements. The other two flames studied (Φoverall = 0.875 and Φoverall = 0.94) showed higher peak temperatures, lower O2 concentrations and the evolution of the size distribution seems to be governed by soot burnout. Measurements of gas-phase compounds, such as O2, CO, CO2, H2, validated a detailed kinetic model, which was used to predict OH∗concentration in the secondary flame. In this way, we were able to compare soot oxidation rates for the systems soot/O2 and soot/OH.

Original languageEnglish
Title of host publicationFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 Fall Meeting
Pages357-367
Number of pages11
ISBN (Electronic)9781615676507
StatePublished - 2009
EventFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 - Irvine, United States
Duration: 26 Oct 200927 Oct 2009

Publication series

NameFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 Fall Meeting
Volume1

Conference

ConferenceFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009
Country/TerritoryUnited States
CityIrvine
Period26/10/0927/10/09

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