Abstract
An oxygen-blown pulverized coal burner for the utilization of various kinds of coal was newly proposed and developed. The combustion efficiency of 99.7% was achieved by the moderate swirl burner. The flame stabilization could not be realized by the strong swirl burner, and the contents of unburned carbon in ash were more than that of the moderate swirl burner experiment. The distribution of vorticity in the moderate swirling flow was equally proportioned even though the flow ratio was changed between 0.15 and 0.88. Additionally, the state of untidiness was observed near center part of the burner nozzle in the strong swirling flow. The close relationship between combustion efficiency and vorticity profiles was found by the flow analysis of PIV. The moderate swirl burner was suitable for designing the burner structure in the oxygen-brown pulverized coal combustion.
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