Hydrodynamics and flue gas desulfurization characteristics of a three-phase, gas-continuous, cocurrent semifluidized bed
The hydrodynamic characteristics of a gas-liquid-solid, gas-continuous, cocurrent semifluidized bed were defined. Five different particle types were used to characterize the hydrodynamics. Air and water were used as the gas and liquid streams, respectively. Six flow regimes were observed in the constrained gas-continuous, three-phase bed. These regimes are described in terms of the solids properties and the gas and liquid superficial velocities. The heights of the packed and fluidized beds and the solids holdup in the fluidized section of the semifluidized bed are discussed in terms of the superficial gas and liquid velocities, the solids density and diameter and the initial quantity of particles in the bed. The desulfurization characteristics of the gas-liquid-solid semifluidized bed were determined using a calcium carbonate slurry. Gas side mass transfer coefficients and the ratio of liquid side to gas side mass transfer coefficients were measured and correlated in terms of gas flow rate, liquid flow rate, bed height, calcium carbonate concentration and sulfur dioxide pressure for both the fluidized and packed sections of the semifluidized bed. The hydrodynamic and mass transfer characteristics were used to construct a mathematical model that predicted overall removal of sulfur dioxide from the simulated flue gas.
- OSTI ID:
- 6933667
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
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54 ENVIRONMENTAL SCIENCES
AIR
AIR POLLUTION CONTROL
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
FLUE GAS
FLUID MECHANICS
FLUIDIZED BED
FLUIDS
GASEOUS WASTES
GASES
HYDRODYNAMICS
HYDROGEN COMPOUNDS
MASS TRANSFER
MATHEMATICAL MODELS
MECHANICS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
POLLUTION CONTROL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES
WATER