Abstract
The effect of bottom and tangential (swirling) gas flow on the solid recirculation rate was studied in a 4” circulating fluidized bed. A complex recirculation pattern was observed for tangential velocities in excess of 75 m/s and was accompanied by a significant reduction in the entrainment rate. The entrainment results were correlated both empirically and using a simple mechanistic model. The high slip velocities predicted by the model justify the large combustion efficiency observed in these combustors.
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