Abstract
A bench scale pulverized coal combustor with oxygen has been designed. Experiment is conducted in a down-fired, cylindrical and vertical furnace. High combustion efficiency has been achieved, and it depends on the oxygen ratio and primary and secondary oxygen flow ratio. The conversion ratio of fuel nitrogen to NO_X is increased significantly up to 1800 ppm, as the oxygen ratio increased. From the results of flow diagnostics by using PIV, particle image velocimetry, for the cold flow model of the burner, there are strong relations between combustion efficiency and slip velocity as well as radial vorticity profiles.
