Abstract
Data analysis from downers requires a comprehensive methodology in order to set the data baseline. This analysis can be accomplished by using a mathematical approach based on solid mass balances and an iterative calculation. Each signal baseline is defined asX+n∙σx, where X is the signal average; σx is the signal standard deviation; and “n” is a baseline parameter. By using this methodology, the noise resulting from secondary reflections is eliminated and all valuable data is kept in the time series.More than 500 experiments with >50 million data records were obtained using two independent gas-solid circulating fluidized bed downer units of 3m height and two different diameters (2.54-cm and 5.08-cm ID). The solid used was a FCC catalyst with a mean particle diameter of 84.42μm and a particle density of 1722kg/m3. Measurements were effected using a CREC-GS-Optiprobe, an optical sensor equipped with a GRIN lens. This lens focus radiation in a 118±34μm diameter highly irradiated volume, placed at 4.5mm away from the sensor tip. CREC-GS-Optiprobe sensors do not require calibration and offer minimum intrusion.On the basis of the data obtained, this study reports a valuable methodology, applicable to downer units of different diameters. This leads for the two downers studied to particle clusters with very close asymmetric distributions.
Published Version
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