Effect of swirl secondary air injection on rice husk combustion in a short- combustion-chamber fluidized bed combustor using nozzle-type air distributor
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Abstract
This research presents the effect of the lower secondary air velocity (V2,low) on combustion performance for firing rice husk, in terms of gas emissions and combustion efficiency (Ec), in a short-combustion-chamber fluidized-bed combustor (SFBC) using sand as an inert material in the bed, and using a nozzle-type air distributor. The combustion behavior inside the SFBC was also presented. In this study, V2,low varied at 10, 15 and 20 m/s, corresponding to the excess air (EA) of 66, 85, and 102%, respectively. The temperature profiles along the combustor indicated that the well-mixed combustion occurred in the bed, while an increase of the V2,low caused a drop in temperature. In view of gas emissions at 6% O2, CO emissions, ranging 2353-8470 ppm, were reduced as the V2,low increased; conversely, more NOx emissions ranging 358-457 ppm were formed. Moreover, the increase in V2,low was capable of Ec enhancement, rising from 92.7% to 97.7%. The results concluded that the optimum V2,low was 20 m/s.
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