CHARACTERIZATION OF FLOW REGIME TRANSITIONS IN A CIRCULATING FLUIDIZED-BED

Mean values and various characteristics of the fluctuating component of the local pressure drop are measured in a circulating fluidized bed. It is shown that simultaneous processing of the above given quantities is necessary for detailed flow regime identification. A parametric approach using a first-order autoregressive model of the time series is proposed to distinguish between the dilute-and dense-phase flows. The values of choking velocity are determined from the dependence of local static pressure drop on gas velocity. The results obtained are compared with some correlations for choking velocity.