Circulation in gas-slurry column reactors
Circulation in bubble columns, such as those used in fischer-tropsch synthesis, detracts from their performance in that gas is carried on average more rapidly through the column, and the residence time distribution of the gas in the column is widened. Both of these factors influence mass-transfer operations in bubble columns. Circulation prediction and measurement has been undertaken using probes, one-dimensional models, laser Doppler velocimetry, and numerical modeling. Local void fraction was measured using resistance probes and a newly developed approach to determining air/water threshold voltage for the probe. A tall column of eight inch diameter was constructed of Plexiglas and the distributor plate was manufactured to distribute air evenly through the base of the column. Data were gathered throughout the volume at three different gas throughputs. Bubble velocities proved difficult to measure using twin probes with cross-correlation because of radial bubble movement. A series of three-dimensional mean and RMS bubble and liquid velocity measurements were also obtained for a turbulent flow in a laboratory model of a bubble column. These measurements have been made using a three-component laser Doppler velocimeter (LDV), to determine velocity distributions non-intrusively. Finally, the gas-liquid flow inside a vertically situated circular isothermal column reactor was simulated numerically. 74 refs., 170 figs., 5 tabs.
- Research Organization:
- West Virginia Univ., Morgantown, WV (USA). Dept. of Mechanical and Aerospace Engineering
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- FG22-87PC79935
- OSTI ID:
- 6472190
- Report Number(s):
- DOE/PC/79935-14; ON: DE91000694
- Country of Publication:
- United States
- Language:
- English
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Circulation in gas-slurry column reactors
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Related Subjects
BUBBLES
VELOCITY
CHEMICAL REACTORS
FLUID MECHANICS
LIQUID FLOW
LIQUIDS
FISCHER-TROPSCH SYNTHESIS
MATHEMATICAL MODELS
PROGRESS REPORT
SLURRIES
TURBULENCE
VELOCIMETERS
CHEMICAL REACTIONS
DISPERSIONS
DOCUMENT TYPES
FLUID FLOW
FLUIDS
MEASURING INSTRUMENTS
MECHANICS
MIXTURES
SUSPENSIONS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)