Abstract
The influence of coil, half-circle plate, and annular plate internal baffles on the mixingcharacteristics of chopped switchgrass in a sand fluidized bed was studied. A cold fluidized bedmodel, dimensionally equivalent to a 25-mm (10-inch) internal diameter fluidized bed gasifier wasused for this study. The percentage of chopped switchgrass in the mixture with sand was 1% byweight. The geometric mean diameter of the sand particles was 375 m. For each baffle typestudied, the Mixing Index, MI (the ratio of local- to overall- concentration of chopped switchgrass insand media) was determined along the bed height to define the quality of mixing. The bed withoutany baffle showed distinctive segregation of chopped switchgrass particles (MI = 0.66 to 1.2). Theannular plate baffle showed the best mixing of chopped switchgrass in the fluidized sand bed (MI =0.89 to 1.09) as compared to coil (MI = 0.76 to 1.28) and half-circle plate (MI = 0.81 to 1.18) baffles.
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