Electroconductivity technique for the measurement of axial variation of holdups in three-phase fluidized beds

Journal Article · Wed Mar 01 00:00:00 EST 1978 · AIChE J.; (United States)

DOI:https://doi.org/10.1002/aic.690240228· OSTI ID:7093921

Begovich, J M; Watson, J S

An electroconductivity technique is described which can be used not only for determining the overall phase holdups in a three-phase fluidized bed, but, more importantly, it can also be used for determining the local holdups as a function of height in the column. One disadvantage of the technique is that it can only be applied to systems with electroconductive liquids. However, since most real or prototype systems use either water or can be simulated with a fluid that can readily be made electroconductive, this handicap does not seem to be too severe. The technique has been applied successfully to a number of systems, including porous alumina beads, if a correction is made for their internal porosity. It has shown the existence of the transition region as the bed goes from a three-phase to a two-phase system. Further work should result in correlations for the distribution of the three phases throughout the entire column. These predictive equations will help in the rational design of reactors in which local conditions throughout the bed must be considered.

• Research Organization: Oak Ridge National Lab., TN
• OSTI ID: 7093921
• Journal Information: AIChE J.; (United States), Vol. 24:2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FLOW RATE
MEASURING METHODS
FLUIDIZED BED
ELECTRIC CONDUCTIVITY
COAL
FLUIDIZATION
HYDROGENATION
PETROLEUM
VARIATIONS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
ELECTRICAL PROPERTIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
PHYSICAL PROPERTIES
420400* - Engineering- Heat Transfer & Fluid Flow