Alkali metal vapor removal from pressurized fluidized-bed combustor flue gas: Annual report, October 1984-September 1985
A laboratory-scale pressurized fluidized-bed coal combustor (PFBC)/alkali sorber was used (1) to measure the alkali vapor (Na and K) concentration in PFBC flue gas on a real-time on-line basis, and (2) to demonstrate simultaneously the granular-bed sorber concept for the removal of alkali vapors from hot PFBC flue gas. An Ames alkali analyzer was used as an on-line, real-time monitor. A batch-type alkali and particulate sampling train (APST) was also installed as a backup for the analysis of both alkali vapor and particulate loading in the flue gas. The test results showed that the particulate loading in the flue gas which exited from the tertiary cyclone varied from 150 to 350 ppMW. The alkali vapor concentration measured by the Ames alkali analyzer was <10 ppBW, which is 1 to 2 orders of magnitude greater than that measured by the batch-type APST. However, consideration of the analytical uncertainty of the two measuring techniques indicated that the difference may not be as great as observed. The analysis of the alkali contents in fly ash samples suggested a negligible evolution of potassium in coal during combustion; however, a significant evolution of sodium was indicated. In a series of laboratory tests, heated (>700/sup 0/C) stainless steel tubing was shown to capture NaCl vapor. This observation suggested that the stainless steel tubing and parts used in the flue gas sampling line of the PFBC/alkali sorber facility could be a sink for the sodium vapor. Further study is needed to verify this postulation. 22 refs., 7 tabs., 15 figs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 7042661
- Report Number(s):
- ANL/FE-86-7; ON: DE87003969
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Measurement of alkali vapor concentration in the PFBC (pressurized fluidized-bed combustion) flue gas
Measurement of alkali vapors in PFBC flue gas and their control by a granular-bed sorber
Related Subjects
ALKALI METAL COMPOUNDS
MEASURING INSTRUMENTS
FLUE GAS
CHEMICAL COMPOSITION
FLUIDIZED-BED COMBUSTORS
ALKALI METALS
COAL
CYCLONE SEPARATORS
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
GRANULAR BED FILTERS
MEDIUM PRESSURE
PARTICULATES
VAPOR CONDENSATION
VAPORS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
CONCENTRATORS
DATA
ELEMENTS
ENERGY SOURCES
EQUIPMENT
FILTERS
FLUIDS
FOSSIL FUELS
FUELS
GASEOUS WASTES
GASES
INERTIAL SEPARATORS
INFORMATION
MATERIALS
MECHANICAL FILTERS
METALS
NUMERICAL DATA
OXIDATION
PARTICLES
POLLUTION CONTROL EQUIPMENT
SEPARATION EQUIPMENT
THERMOCHEMICAL PROCESSES
WASTES
014000* - Coal
Lignite
& Peat- Combustion