Dynamical tests on fiber optic data taken from the riser section of a circulating fluidized bed

Conference · Thu Nov 01 00:00:00 EDT 2007

OSTI ID:937510

Taylor, E M; Guenther, C P; Breault, R W

Dynamical tests have been applied to fiber optic data taken from a cold-flow circulating fluidized bed to characterize flow conditions, identify three time and/or length scales (macro, meso, and micro), and understand the contribution these scales have on the raw data. The characteristic variable analyzed is the raw voltage signal obtained from a fiber-optic probe taken at various axial and radial positions under different loading conditions so that different flow regimes could be attained. These experiments were carried out with the bed material of 812 μm cork particles. The characterization was accomplished through analysis of the distribution of the signal through the third and fourth moments of skewness and excess kurtosis. A generalization of the autocorrelation function known as the average mutual information function was analyzed by examining the function’s first minimum, identifying the point at which successive elements are no longer correlated. Further characterization was accomplished through the correlation dimension, a measure of the complexity of the attractor. Lastly, the amount of disorder of the system is described by a Kolmogorov-type entropy estimate. All six aforementioned tests were also implemented on ten levels of detail coefficients resulting from a discrete wavelet transformation of the same signal as used above. Through this analysis it is possible to identify and describe micro (particle level), meso (clustering or turbulence level), and macro (physical or dimensional level) length scales even though some literature considers these scales inseparable [6]. This investigation also used detail wavelet coefficients in conjunction with ANOVA analysis to show which scales have the most impact on the raw signal resulting from local hydrodynamic conditions.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE)
• DOE Contract Number: Not cited
• OSTI ID: 937510
• Report Number(s): DOE/NETL-IR-2008-045; NETL-TPR-1927; TRN: US200819%%163
• Resource Relation: Conference: 2007 AIChE Annual Meeting, Salt Lake City, UT, Nov. 4-9, 2007
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASYMMETRY
CIRCULATING SYSTEMS
CORK
DISTRIBUTION
ENTROPY
FIBER OPTICS
FLUIDIZED BEDS
HYDRODYNAMICS
PROBES
STATISTICS
TRANSFORMATIONS
TURBULENCE
COAL
COMPUTERIZED SIMULATION
DESIGN
EFFICIENCY
ENGINEERS
FLUID MECHANICS
GASIFICATION
OPTIMIZATION
PERFORMANCE
POWER PLANTS
SIMULATION