The ability of radical scavengers, such as iodine, to affect the yield of nitrogen-containingspecies has previously been used to give insight on the mechanism of char-N conversionto NO during fluidized bed coal combustion. This paper presents preliminarilyexperimental results on the effect that the addition of a radical scavenger (HBr) has onthe conversion of char-N to NO for pulverized coal particles at gas temperatures of 1173K and 1423 K and with two different background NO concentrations (45 ppm and 500ppm dry). The experiments show an increase in CO concentration in the presence of HBrat 1173 K and no change at 1423 K. The change in NO concentration after HBr additionis positive at 1173 K and negative at 1423 K. Future experiments and application of a detailedreacting particle model are required to explain the mechanism for the variation ofNO concentration after HBr addition.
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