Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF
- 846 Downloads
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.
KeywordsLaser Sheet Diffusion Flame Coal Particle Char Combustion Flame Luminosity
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.
- 1.B. Metz, O. Davidson, H.C. de Coninck, M. Loos, L.A. Meyer, Carbon dioxide Capture and Storage (Cambridge University Press, Cambridge, 2005)Google Scholar
- 24.N. Darabiha, P. Scouflaire, M. Xia, B. Fiorina, in ECM (2015)Google Scholar
- 25.N. Vorobiev, M. Schiemann, in 40th International Technical Conference on Clean Coal Fuel System, Clearwater, Florida, USA (2015), pp. 550–561Google Scholar