Measurement of alkali in PFBC exhaust
This project supports the DOE/METC Fossil Energy Program for the development of PFBC technology. Based on the analytical activated-bauxite sorber-bed technique, we are developing the RABSAM as an altemative to the on-line alkali analyzer for field application. As shown in Fig. 1, the RABSAM is a sampling probe containing a regenerable activated-bauxite adsorbent (RABA). It can be inserted directly into the PFBC exhaust duct and requires no HTHP sampling line. Alkali vapors are captured by the adsorbent purely through physical adsorption. The adsorbent is regenerated by a simple water-leaching process, which also recovers the adsorbed alkalis. The alkali analysis of the leachate by atomic absorption (AA) provides a basis for calculating the time-averaged alkali-vapor concentration in the PFBC exhaust. If the RABA is to use commercial grade activated bauxite, the clay impurities in activated bauxite can react with alkali vapors and, therefore, need to be either removed or deactivated. In earlier work, a 6M-LiCl-solution impregnation technique was shown to deactivate these impurities in fresh activated bauxite [8]. During this year, RABA prepared by this technique was tested in a pressurized alkali-vapor sorption test unit to determine its NaCl-vapor capture efficiency and the regenerability of the sorbent by water extraction. Results of this study are presented and discussed.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6911334
- Report Number(s):
- ANL/CMT/CP-77193; CONF-921034-1; ON: DE93002900
- Resource Relation:
- Conference: US Department of Energy contractors review meeting on coal-fueled heat engines, advanced PFBC and gas stream cleanup systems, Morgantown, WV (United States), 27-28 Oct 1992
- Country of Publication:
- United States
- Language:
- English
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Measurement of alkali in PFBC exhaust
Measurement of alkali in PFBC exhaust
Related Subjects
20 FOSSIL-FUELED POWER PLANTS
ALKALI METAL COMPOUNDS
ABSORPTION SPECTROSCOPY
ADSORPTION
BAUXITE
SORPTIVE PROPERTIES
COAL
FLUIDIZED-BED COMBUSTION
EMISSION
CHEMICAL ANALYSIS
SAMPLING
FLUIDIZED-BED COMBUSTORS
LEACHING
REGENERATION
ALUMINIUM ORES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
DISSOLUTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
ORES
OXIDATION
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions