Flame Structure and Soot-Precursor Formation of Coflow -Heptane Diffusion Flame Burning in and Atmosphere
Publication: Journal of Energy Engineering
Volume 147, Issue 4
Abstract
Oxycombustion allied with flue gas recirculation is a promising combustion technology owing to its potential to enhance combustion while reducing pollutant emissions. This numerical work investigated the effects of dilution under oxygen enrichment conditions on the flame structure and soot precursor formation in an -heptane coflow diffusion flame. The numerical approach considered kinetic chemistry, thermal and transport properties, and a radiative heat transfer model. The oxygen content in the oxidizer stream was varied from 30% to 60% (molar basis) with or as diluent. The chemical effect of diluent was isolated numerically from its total thermal effect using an inert counterpart fictitious . Results demonstrated that increasing concentration significantly increased the flame temperature and soot precursor species, whereas a notable reduction of flame height occurred with increasing . Soot precursors were suppressed by replacing with in the coflow oxidizer through not only thermal effects but also through chemical effects. The primary pathway for the chemical effect of is the reaction , which decreases H radicals. The results also showed that the effect of was more profound at lower oxygen conditions, indicating that the inhibition effect of could be restricted in higher oxygen conditions.
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Data Availability Statement
All data, models, and code used during the study appear in the published article.
Acknowledgments
This work was supported by the National Natural Science foundation of China (NSFC No. 51876083).
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Received: Dec 9, 2020
Accepted: Mar 28, 2021
Published online: Jun 12, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 12, 2021
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