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

Abstract

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 hotmore » 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.« less

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
OSTI Identifier:
5601063
Report Number(s):
CONF-860940-1
ON: DE86005551
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
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
Subject:
01 COAL, LIGNITE, AND PEAT; 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

Citation Formats

Lee, S H.D., and Myles, K M. Measurement of alkali vapor in PFBC flue gas and its control by a fixed granular bed of activated bauxite. United States: N. p., 1985. Web.
Lee, S H.D., & Myles, K M. Measurement of alkali vapor in PFBC flue gas and its control by a fixed granular bed of activated bauxite. United States.
Lee, S H.D., and Myles, K M. 1985. "Measurement of alkali vapor in PFBC flue gas and its control by a fixed granular bed of activated bauxite". United States.
@article{osti_5601063,
title = {Measurement of alkali vapor in PFBC flue gas and its control by a fixed granular bed of activated bauxite},
author = {Lee, S H.D. and Myles, K M},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5601063}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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