Measurement of alkali vapor in PFBC flue gas and its control by a fixed granular bed of activated bauxite
A fixed granular-bed sorber, with regenerable activated bauxite as the sorbent, for the control of the alkali vapor in the flue gas produced during pressurized fluidized-bed combustion (PFBC) of coal is being developed. In a gas stream closely simulating the actual PFBC flue gas, activated bauxite is shown to capture NaCl vapor by (1) chemical fixation of the vapor with the intrinsic clay minerals, probably to form thermally stable, water-insoluble sodium aluminosilicates and (2) chemical conversion of NaCl vapor into a condensed-phase sodium sulfate, which has a much lower vapor pressure than does NaCl. The latter predominates the capture process, and the captured sodium sulfate can be easily removed by simple water-leaching to restore the porosity of activated bauxite for reuse. A high-temperature (less than or equal to 900/sup 0/C) and high-pressure (less than or equal to 10 atm) laboratory-scale, fixed, granular-bed alkali sorber has been operated with the Argonne National Laboratory PFBC combustor to (1) measure the alkali vapor concentration in the PFBC flue gas on a real-time, on-line basis, and (2) demonstrate the alkali sorber for the control of alkali vapor from an actual PFBC flue gas. The alkali (Na + K) vapor concentration in particulate filtered hot flue gas was measured to be <10 ppbW with the Ames analyzer. The same measurement with the APST was higher between 90 to 170 ppbW. Therefore, the possibility of sink for sodium vapor in the PFBC/alkali sorber system must be considered. 32 refs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5601063
- Report Number(s):
- CONF-860940-1; ON: DE86005551
- Resource Relation:
- Conference: Gas cleaning at high temperatures conference, Guildford, Surrey, UK, 16 Sep 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Removal of alkali vapors by a fixed granular-bed sorber using activated bauxite as a sorbent
Removal of alkali vapors by a fixed granular-bed sorber using activated bauxite as a sorbent
Related Subjects
ALKALI METAL COMPOUNDS
MEASURING INSTRUMENTS
ON-LINE MEASUREMENT SYSTEMS
COAL
COMBUSTION PRODUCTS
FLUIDIZED-BED COMBUSTION
FILTRATION
GRANULAR BED FILTERS
PERFORMANCE TESTING
BAUXITE
CHEMICAL REACTIONS
EXPERIMENTAL DATA
MEDIUM PRESSURE
SODIUM CHLORIDES
VAPORS
ALUMINIUM ORES
CARBONACEOUS MATERIALS
CHLORIDES
CHLORINE COMPOUNDS
COMBUSTION
DATA
ENERGY SOURCES
FILTERS
FLUIDS
FOSSIL FUELS
FUELS
GASES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MATERIALS
MECHANICAL FILTERS
NUMERICAL DATA
ON-LINE SYSTEMS
ORES
OXIDATION
SEPARATION PROCESSES
SODIUM COMPOUNDS
TESTING
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion