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ABSTRACT
An investigation into the effect of a change in the near burner region aerodynamics was undertaken in a large-scale laboratory furnace firing a high-volatile bituminous pulverised fuel. To this end two variations of primary air/fuel jet design were installed in a swirl stabilized burner of the type used in wall-fired boilers. Significant differences in flame shape, intensity, stability performance and pollutant emissions were observed and recorded when a burner gun with a single annular fuel injection orifice (SAO), appropriate to industrial practice, wherein the central bluff body provides a location for the light-up burner, was replaced with a simplified version with the bluff body removed. The replacement, with a single central orifice (SCO), maintained the same cross-sectional area to that of the original.
A dramatic reduction in NO emissions (30%) was observed for this burner with no discernible deterioration in flame efficiency brought about by a reduction in panicle burnout. Under normal operating conditions the SCO burner exhibits a similar stability performance to that of the SAO.