Measurement of alkali vapor in PFBC flue gas and its control by a fixed granular bed of activated bauxite

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5601063

Lee, S H.D.; Myles, K M

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
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
&amp; Peat-- Combustion
ALKALI METAL COMPOUNDS
ALUMINIUM ORES
BAUXITE
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COAL
COMBUSTION
COMBUSTION PRODUCTS
DATA
ENERGY SOURCES
EXPERIMENTAL DATA
FILTERS
FILTRATION
FLUIDIZED-BED COMBUSTION
FLUIDS
FOSSIL FUELS
FUELS
GASES
GRANULAR BED FILTERS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
MATERIALS
MEASURING INSTRUMENTS
MECHANICAL FILTERS
MEDIUM PRESSURE
NUMERICAL DATA
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
ORES
OXIDATION
PERFORMANCE TESTING
SEPARATION PROCESSES
SODIUM CHLORIDES
SODIUM COMPOUNDS
TESTING
THERMOCHEMICAL PROCESSES
VAPORS