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Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF

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Abstract

This work presents first-of-its-kind high-speed planar laser-induced fluorescence measurements of the hydroxyl radical in the boundary layer of single coal particles. Experiments were performed in a laminar flow reactor providing an oxygen-enriched exhaust gas environment at elevated temperatures. Single coal particles in a sieve fraction of 90–125 µm and a significant amount of volatiles (36 wt%) were injected along the burner’s centerline. Coherent anti-Stokes Raman spectroscopy measurements were taken to characterize the gas-phase temperature. Time-resolved imaging of the OH distribution at 10 kHz allowed identifying reaction and post-flame zones and gave access to the temporal evolution of burning coal particles. During volatile combustion, a symmetric diffusion flame was observed around the particle starting from a distance of ~150 µm from the particle surface. For subsequent char combustion, this distance decreased and the highest OH signals appeared close to the particle surface.

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Acknowledgments

The authors gratefully acknowledge the sponsorship of the Deutsche Forschungsgemeinschaft through SFB/TRR 129, subprojects A02 and B05. A. Dreizler is grateful for generous support through the Gottfried Wilhelm Leibniz program of Deutsche Forschungsgemeinschaft.

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Authors and Affiliations

  1. Fachgebiet Reaktive Strömungen und Messtechnik, Technische Universität Darmstadt, Jovanka-Bontschits-Straße 2, 64287, Darmstadt, Germany

    J. Köser, L. G. Becker & A. Dreizler

  2. Department of Energy Plant Technology, Ruhr-University, Universitätsstraße 150, 44801, Bochum, Germany

    N. Vorobiev, M. Schiemann & V. Scherer

  3. Fachgebiet Energie- und Kraftwerkstechnik, Technische Universität Darmstadt, Jovanka-Bontschits-Straße 2, 64287, Darmstadt, Germany

    B. Böhm

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  1. J. Köser
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  2. L. G. Becker
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  3. N. Vorobiev
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  4. M. Schiemann
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  7. A. Dreizler
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Correspondence to J. Köser.

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Köser, J., Becker, L.G., Vorobiev, N. et al. Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF. Appl. Phys. B 121, 459–464 (2015). https://doi.org/10.1007/s00340-015-6253-3

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  • DOI: https://doi.org/10.1007/s00340-015-6253-3

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