Measurement of alkali vapors in PFBC flue gas and their control by a granular-bed sorber

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

OSTI ID:5638292

Lee, S H.D.; Henry, R F; Wilson, W I; Myles, K M; Haas, Jr, W J; Eckels, D E

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-31109-ENG-38
• OSTI ID: 5638292
• Report Number(s): CONF-850522-1; ON: DE85013863
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
&amp; Peat-- Combustion
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM ORES
ASHES
BAUXITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PRODUCTS
CONTROL
DATA
DOLOMITE
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FILTERS
FILTRATION
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
GRANULAR BED FILTERS
INFORMATION
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MEASURING METHODS
MECHANICAL FILTERS
MEDIUM PRESSURE
METALS
MINERALS
NUMERICAL DATA
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
ORES
OXIDATION
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POLLUTION CONTROL
POTASSIUM
PURIFICATION
REAL TIME SYSTEMS
REMOVAL
RESIDUES
SEPARATION PROCESSES
SODIUM
TESTING
THERMOCHEMICAL PROCESSES