Measurement of alkali vapors in PFBC flue gas and their control by a granular-bed sorber
This work supports a program to measure the level of alkali vapors in the flue gas from the pressurized fluidized-bed combustion (PFBC) of coal and to develop a granular-bed sorber system for their control. A laboratory-scale fixed granular-bed sorber (7.9-cm-dia) was constructed and integrated with a 15.2-cm-dia (6-in.-dia) PFB combustor system for the alkali vapor measurement and evaluation of the sorber unit. Tests were conducted with Sewickley coal and Tymochtee dolomite at bed temperatures from 875 to 950/sup 0/C and a system pressure of 9 atm absolute. The alkali concentrations, sodium and potassium, in the filtered hot (850 to 900/sup 0/C) flue gas streams were measured with an Ames on-line real-time alkali analyzer and found to be <10 ppbW. An alkali concentration 1-2 orders of magnitude greater was determined in tests on a batch-type alkali sampling train. Alkali analysis of the fly ash suggests a negligible evolution of potassium from coal; however, a much higher sodium evolution from coal than the measured concentrations is indicated. Laboratory studies demonstrated the capture of NaCl vapor by heated (>750/sup 0/C) stainless steel, indicating that the stainless steel material used in the PFBC/alkali sorber system could act as a sink for alkali vapors. Details of the tests are presented and the results are discussed. 18 refs., 10 figs., 7 tabs.
- Research Organization:
- Argonne National Lab., IL (USA); Ames Lab., IA (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5638292
- Report Number(s):
- CONF-850522-1; ON: DE85013863
- Resource Relation:
- Conference: 5. annual contractors' review meeting on contaminant control in hot coal derived gas streams, Morgantown, WV, USA, 7 May 1985
- Country of Publication:
- United States
- Language:
- English
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A fixed granular-bed sorber for measurement and control of alkali vapors in PFBC (pressurized fluidized-bed combustion)
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Related Subjects
ALKALI METAL COMPOUNDS
AIR POLLUTION CONTROL
MEASURING METHODS
REMOVAL
ASHES
CHEMICAL COMPOSITION
COAL
FLUIDIZED-BED COMBUSTION
COMBUSTION PRODUCTS
PURIFICATION
DOLOMITE
GRANULAR BED FILTERS
PERFORMANCE TESTING
BAUXITE
EXPERIMENTAL DATA
FILTRATION
MEDIUM PRESSURE
ON-LINE MEASUREMENT SYSTEMS
POTASSIUM
REAL TIME SYSTEMS
SODIUM
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM ORES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHEMICAL REACTIONS
COMBUSTION
CONTROL
DATA
ELEMENTS
ENERGY SOURCES
FILTERS
FOSSIL FUELS
FUELS
INFORMATION
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MECHANICAL FILTERS
METALS
MINERALS
NUMERICAL DATA
ON-LINE SYSTEMS
ORES
OXIDATION
OXYGEN COMPOUNDS
POLLUTION CONTROL
RESIDUES
SEPARATION PROCESSES
TESTING
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion