Alternatives to calcium-based SO/sub 2/ sorbents for fluidized-bed combustion: conceptual evaluation. Final report, December 1975--December 1976

Technical Report · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6616142

Newby, R A; Keairns, D L

The report gives results of a conceptual engineering evaluation to screen supported metal oxides as alternatives to natural calcium-based sorbents (limestones and dolomites) for SO/sub 2/ control in atmospheric and pressurized fluidized-bed combustion (FBC) processes. Alternative sorbents were evaluated, using three acceptance criteria: SO/sub 2/ removal capability in the combustor, predicted by thermodynamics; SO/sub 2/ concentrations achievable in the regenerator off-gas, according to thermodynamics; and SO/sub 2/ concentrations off the regenerator, achievable based on material and energy balances. The evaluation identified 14 potentially acceptable sorbents for atmospheric FBC, and 11 for pressurized FBC. Cost estimates were prepared to project the maximum acceptable loss rates for the alternative sorbents due to attrition and/or deactivation. Loss rates must be less than 0.1% of bed inventory per hour in order to compete economically with natural calcium-based sorbents, even if maximum thermodynamic performance were obtained. U.S. resources of some minerals may be of extreme importance for many of the alternative metal oxide sorbents considered.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center
• OSTI ID: 6616142
• Report Number(s): PB-278332
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
ADSORBENTS
AIR POLLUTION ABATEMENT
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
COMPARATIVE EVALUATIONS
COST
DESULFURIZATION
FLUE GAS
FLUIDIZED-BED COMBUSTION
GASEOUS WASTES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
WASTES