Abstract
In pulverized coal combustion flames, the behavior of coal particles is one of the most important factors for the combustion efficiency and hazardous exhaust. It is, however, very difficult to measure it by use of conventional methods mainly because the coal particles in flames are non-spherical. In this study, for providing a better understanding of particle behavior in pulverized coal combustion, a laboratory-scale pulverized coal combustion burner was specially fabricated to observe the detailed flame structures. Velocity and shape of non-spherical coal particles were measured by shadow Doppler velocimetry (SDV) and the results on velocity were compared with those by laser Doppler velocimetry (LDV). In addition, light emissions from a local point in the flame were detected by a specially designed receiving optics, Multi-color Integrated Receiving Optics (MICRO), and the flame temperature was measured by two-color radiation pyrometer.
