Abstract
To achieve significant reductions in particularly high NOx emissions and to eliminate severe asymmetric combustion in down-fired boilers, a multiple-injection and multiple-staging combustion technology was developed in our previous study. That technology was trialed in a newly designed down-fired 600 MWe supercritical utility boiler, without applying overfire air. In consequence, a reconfiguring of the secondary air for the redesigned burners on the arches, composed of direct-flow inner and outer secondary air, had to be performed for the newly reconfigured furnace. The present work reports our experimental investigation on the impact of the distance between inner and outer secondary air on aerodynamic characteristics within the furnace, determined by cold airflow experiments within a cold 1:20-scaled model of the furnace. Aerodynamic field measurements were conducted at four different settings, each distinguished by the ratio (denoted by Cs) of the distance between the inner and outer secondary air to th...
Published Version
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