Emissions of oxides of nitrogen (NOx) from combustion devices is a topic of
tremendous current importance. The bulk of the review of NOx emissions has been in
the field of turbulent jet flames. However laminar jet flames have provided much insight
into the relative importance of NOx reaction pathways in non premixed combustion for
various flame conditions. The existing models include detailed chemistry kinetics for
various species involved in the flame. These detailed models involve very complex
integration of hundreds of chemical reactions of various species and their intermediates.
Hence such models are highly time consuming and also normally involve heavy
computational costs. This work proposes a numerical model to compute the total
production of NOx in a non-premixed isolated circular laminar jet flame. The jet
consists of the fuel rich inner region and the O2 rich outer region. The model estimates
both thermal NOx and prompt NOx assuming single step kinetics for NOx formation and
a thin flame model. Further the amount of air entrainment by jet depends upon the Sc
number of fuel. The higher the Sc number, the higher is the air entrained which lowers
the flame temperature and hence NOx formation. With increasing Sc number, flame
volume increases which leads to an increase in the NOx formation. The effect of the Sc
number variation on the net production of NOx and flame structure is also investigated.
The effect of equilibrium chemistry for CO2 <-> CO + 1/2 O2 and H2O <-> H2 +1/2 O2
on total NOx emission is studied. Also the effect of both CO2 and H2O equilibrium is
considered simultaneously and the net x NO formation for propane is 45 ppm. The split
between pre-flame and post-flame regions is also investigated. For Propane, 96% of NO emissions occur in the pre-flame region and about 4% in the post-flame region. The
model predictions are compared with experimental values of NOx missions reported
elsewhere.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/4749 |
| Date | 25 April 2007 |
| Creators | Siwatch, Vivek |
| Contributors | Annamalai, Kalyan |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 648554 bytes, electronic, application/pdf, born digital |
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