Limestone sorbent regeneration in externally fired rotary kilns
Externally fired rotary kilns were evaluated for use as regeneration reactors for the spent limestone sorbent from a fluid-bed combustor. Coke and spent sorbent containing approximately 8 wt % sulfur were reacted at temperatures between 960 and 1060/sup 0/C in two laboratory-scale externally fired rotary kilns to produce lime sorbent suitable for reuse, and concentrated SO/sub 2/. It was possible to achieve a high percent of sorbent regeneration, but the SO/sub 2/ concentration in the off-gas was low. Different operating conditions were required to produce a higher concentration of SO/sub 2/ in the off-gas, and under these conditions, the percent of sorbent regeneration was low. Two empirical equations and the shrinking-core reaction-rate model were examined for application to the experimentally determined kinetic data. The shrinking-core model appeared to fit the data better than the empirical equations, and could be a useful predictor of the conversion of sulfated limestone and of the SO/sub 2/ concentration in the off-gas from a rotary-kiln regenerator. The materials used in the construction of one of the laboratory kilns were typical of commercially available production-size rotary kilns that are externally fired. However, the materials of construction were not sufficiently durable to withstand the high SO/sub 2/ concentrations and high temperatures involved in this reaction.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5650783
- Report Number(s):
- ANL/CEN/FE-79-12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
36 MATERIALS SCIENCE
COAL
FLUIDIZED-BED COMBUSTION
KILNS
CORROSION
MATERIALS
LIMESTONE
REGENERATION
SULFUR DIOXIDE
CORROSIVE EFFECTS
BENCH-SCALE EXPERIMENTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTORS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
KINETICS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
SULFUR COMPOUNDS
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
421000 - Engineering- Combustion Systems
360105 - Metals & Alloys- Corrosion & Erosion