Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF
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.
- Publication:
-
Applied Physics B: Lasers and Optics
- Pub Date:
- December 2015
- DOI:
- 10.1007/s00340-015-6253-3
- Bibcode:
- 2015ApPhB.121..459K
- Keywords:
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- Laser Sheet;
- Diffusion Flame;
- Coal Particle;
- Char Combustion;
- Flame Luminosity