| Abstract
| - This paper reports on the development and validation of comprehensive combustion sub modelsthat include the effect of large aspect ratio of biomass (switchgrass) particles on carbon burnoutand temperature distribution inside the particles. Temperature and carbon burnout data arecompared from two different models that are formulated by assuming (i) the particles arecylindrical and conduct heat internally, and (ii) the particles are spherical without internal heatconduction, i.e., no temperature gradient exists inside the particle. It was inferred that the lattermodel significantly underpredicted the temperature of the particle and, consequently, the burnout.Additionally, some results from cofiring biomass (10% heat input) with pulverized coal (90% heatinput) are compared with the pulverized coal (100% heat input) simulations and coal experimentsin a tangentially fired 150 MWe utility boiler.
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