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Acoustic measurements in a circulating fluidized bed

J.S. Halow, E.R. Monazam
Federal Energy Technology Center
Morgantown WV 26507-0880

C.S. Daw
Oak Ridge National Laboratory
Knoxville TN 37932-6472

C.E.A. Finney
University of Tennessee
Knoxville TN 37996-2210

A large scale cold model experimental circulating fluidized has been constructed at the U.S. Federal Energy Technology Center. The facility consists of a 0.3 m diameter by 18 m high riser coupled to a 0.25 m diameter standpipe. It includes many transparent sections through which the gas-solids flows may be observed and studied and the system is equipped with a variety of normal and high speed pressure transducers, video equipment, and acoustic sensors. Capacitance measurement of void fraction and a capacitance imaging system are being added to the system. The facility has been in operation for about one year and has proven to be easy to operate and reconfigure.

This paper describes the circulating fluid bed system and associated sensors for obtaining passive acoustic measurements. Monitoring the characteristic sounds of particle-particle and particle-wall collisions can provide useful information about temporal patterns. Measurements were made with wall mounted transducers are analyzed and shown to correlate with solids circulation rate and high speed pressure fluctuations.

Data from the facility will be used to validate computational fluid dynamic models. A range of time scales have been found to be important to describe various phenomena within the system from the very short 10 to 20 millisecond scales associated with single particle events to scales involving minutes for inventory shift between the standpipe and riser. New methods based on time series symbolization are used to characterize and compare these time scales for both experiments and CFD models.

Halow JS, Monazam ER, Daw CS, Finney CEA (1999). Acoustic measurements in a circulating fluidized bed. Fifth International Conference on Fluid-Particle Interactions (Santa Fe, New Mexico USA; 1999 May 09-14).
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