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NO reburning study based on species quantification obtained by coupling LIF and cavity ring-down spectroscopy
X Mercier1, L Pillier, A el Bakali
1Laboratoire de Cinétique et Chimie de la Combustion-UMR CNRS 8522, Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq, France.
Faraday Discussions
|March 7, 2002
Summary
This study investigates nitrogen oxide (NO) reburning in a low-pressure methane-oxygen flame using advanced laser spectroscopy. Researchers quantified NO reburning and compared experimental data with combustion models, finding good agreement for key species like CN and NO.
Area of Science:
- Combustion Chemistry
- Spectroscopy
- Chemical Kinetics
Background:
- Understanding nitrogen oxide (NO) reburning is crucial for controlling emissions in combustion processes.
- Previous studies have reported varying concentrations of key radical species like cyano (CN) in similar flames.
- Accurate experimental data is needed to validate combustion mechanisms.
Purpose of the Study:
- To experimentally investigate nitrogen oxide (NO) reburning in a low-pressure premixed CH4-O2 flame.
- To measure the mole fraction profiles of key species including NO, hydroxyl (OH), CH, and CN.
- To compare experimental results with predictions from the GRI 3.0 combustion mechanism.
Main Methods:
- Utilized cavity ring-down spectroscopy (CRDS) and laser-induced fluorescence (LIF) for species concentration measurements.
- Employed OH-LIF thermometry for temperature profiling.
- CRDS was used for direct NO reburning amount determination and CH/CN mole fraction profiling.
Main Results:
- Directly quantified the NO reburning amount in the burned gases.
- Measured peak mole fractions of 29 ppm for CH and 3.3 ppm for CN.
- Experimental species profiles showed good agreement with GRI 3.0 mechanism predictions, particularly for CN and NO.
Conclusions:
- The study provides direct experimental evidence of NO reburning and quantifies key radical species concentrations.
- The findings validate the GRI 3.0 mechanism's ability to predict species profiles in this combustion system.
- Discrepancies in CN concentration compared to previous studies highlight the importance of accurate measurement techniques.