Abstract
In this work, we targeted combustion reaction zone of the primary air in the actual pulverized coal burners, and the burner was fabricated as open type in order to apply various optical measurement techniques. The detailed and overall evaluation was performed by applying the various optical measurement techniques to the flame, for example LDV, SDPA, MICRO, two-color radiation pyrometer. It was observed that the particle mean diameter increases 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, which result in the char reaction and the particle swelling due to devolatilization, respectively. The size-classified streamwise velocities of pulverized coal particle in the central region of the jet indicate the same magnitude, whereas those in the outer region are different depending on the particle size. This behavior was well explained in terms of particle inertia.
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