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Gas holdup and solids dispersion in a three-phase slurry bubble column
Ist Teil von
AIChE journal, 1990-11, Vol.36 (11), p.1731-1735
Ort / Verlag
New York: American Institute of Chemical Engineers
Erscheinungsjahr
1990
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
Studies with three-phase systems in bubble columns have shown that the effect of solids on gas holdup depends on a variety of factors. Important among these are: liquid properties and particle properties such as density, size and concentration in the slurry, and wettability. Most of these studies have been made with cold flow systems; and the data at high temperatures and pressures, i.e., with systems of potential industrial importance, are rare. The objective of this paper is to obtain hydrodynamic data at elevated temperatures using a three-phase system of importance to FTS. In particular, the effects of solids type, size and concentration on gas holdup and axial solids dispersion were investigated. Two types of solids used, iron oxide and silica, simulate typical catalysts and supports, respectively, employed in FTS. A wider range of gas velocities (up to 0.12 m/s) than those used by Deckwer et al, ({lt}0.04 m/s) was employed in this study. Additionally, data were obtained from experiments conducted with slurry circulation (continuous mode of operation), whereas all the previous studies with molten waxes were conducted in the batch mode of operation (without liquid flow).