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Capacitive system for three-dimensional imaging of fluidized-bed density

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3 Author(s)
Fasching, George E. ; Morgantown Energy Technol. Center, WV, USA ; Loudin, W.J. ; Smith, Nelson S.

The U.S. Department of Energy's Morgantown Energy Technology Center has been developing a capacitance imaging system (CIS) to support its fluidized-bed research programs. A second-generation system for capacitively imaging a cold, laboratory-scale, 15.24-cm diameter fluidized bed is described. The CIS acquires interelectrode, bed-crossing displacement current data to provide 193-pixel density values at four 2.54-cm vertically spaced levels and presents a three-dimensional density display at a rate of 30 maps per second in real time. The CIS also stores displacement current data at a rate of 60 density maps per level per second for post-run analysis. Different means of data processing are described that produce one method for real-time display and two methods for post-run analysis of data. The results of calibration and fluidization tests are presented, together with the errors associated with each of the methods for the known pixel densities in the calibration tests. Improvement in the calibration procedure to reduce these errors is proposed. Test results indicate the CIS would be a useful tool for research and monitoring operations in two-phase systems

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:43 ,  Issue: 1 )

Date of Publication:

Feb 1994

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