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A Study on the Particle Behavior in Turbulent Pulverized Coal Flame  

Hwang, Seung-Min (Department of Health Environment, Graduate School of Venture, Hoseo University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.12, 2010 , pp. 1111-1118 More about this Journal
Abstract
Combustion measurements based on optical techniques have recently become of major interest as tools not only for clarifying the combustion mechanism but also for validating the computational results for the combustion fields. In this study, the particle behavior in turbulent pulverized coal flame are investigated using advanced optical diagnostics. A laboratory-scale pulverized coal combustion burner is specially fabricated as open type in order to apply various optical measurement techniques. The detailed particle behavior is performed by LDV (laser Doppler velocimetry) and SDPA (shadow Doppler particle analyzer). It is observed that the particle mean diameter increase as the distance from burner increases, and this is found to be caused by the decrease of small particles' diameter and increase of large particles' diameter. This is because of result in the char reaction and the particle swelling due to devolatilization, respectively. The size-classified streamwise velocities of pulverized coal particles in the central region of the jet show the same magnitude, whereas those in the outer region are different depending on the particle size. The results show that the velocity and size-classified diameter of the pulverized coal particles in the flame can be measured well by SDPA.
Keywords
Pulverized Coal Combustion; Optical Measurement; Laser Doppler Velocimetry; Shadow Doppler Particle Analyzer;
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Times Cited By KSCI : 1  (Citation Analysis)
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