Alkali-metal-vapor removal from pressurized fluidized-bed-combustor flue gas. Annual report, October 1981-September 1982

Technical Report · Tue Mar 01 04:00:00 EST 1983

OSTI ID:6456356

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

This work supports the program to develop sorbents for the cleanup of gases from pressurized fluidized-bed coal combustion (PFBC) so that the cleaned hot gases can be used to power downstream gas turbines without causing corrosion. A simulated PFBC flue gas containing NaCl vapor was used to characterize activated bauxite and diatomaceous earth at a bed temperature of 905/sup 0/C and a system pressure of 10 atm absolute. The NaCl vapor was found to be captured by activated bauxite essentially as sodium sulfate, with a small fraction captured as sodium chloride. In contrast, diatomaceous earth captured NaCl vapor by a combined result of (1) a chemical reaction that converts the vapor into condensed sodium sulfate and (2) chemical reactions that transform the captured sodium into water-insoluble silicate compounds. In NaCl-vapor sorption efficiency studies, a 12.7-cm-long activated bauxite bed was tested for 12 h in a gas stream containing 4 to 8 ppmV NaCl-vapor concentration, and >99.8% NaCl-vapor sorption efficiency was achieved. This efficiency compared with 99.1 and 95.3% obtained by a diatomaceous earth bed of the same length tested for 8 h in gas streams containing 28 and 2 ppmV NaCl-vapor concentration, respectively. The addition of HCl to the simulated flue gas had an insignificant effect on the NaCl-vapor sorption behavior and efficiency of activated bauxite. Experimental results are also presented on (1) the water leachability of the sodium captured on activated bauxite, (2) the partial conversion to sodium sulfate of the NaCl sample used as the vapor source for the sorption tests, and (3) the changes in the chemical and physical properties of both sorbents as a result of exposure to the simulated flue gas.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6456356
• Report Number(s): ANL/FE-82-24; ON: DE83010689
• Country of Publication: United States
• Language: English

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20 FOSSIL-FUELED POWER PLANTS
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ADSORBENTS
ADSORPTION
ALKALI METALS
ALUMINIUM ORES
BAUXITE
CARBONACEOUS MATERIALS
COAL
COMBINED-CYCLE POWER PLANTS
COMBUSTORS
DATA
EFFICIENCY
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLUE GAS
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
GASEOUS WASTES
HOT GAS CLEANUP
INFORMATION
MATERIALS
METALS
NUMERICAL DATA
ORES
POWER PLANTS
PURIFICATION
SORPTION
THERMAL POWER PLANTS
WASTES