Regeneration of sulfated dolomite by reductive decomposition with coal in a fluidized bed reactor

Journal Article · Sun Jan 01 04:00:00 EST 1978 · AIChE Symp. Ser.; (United States)

OSTI ID:5870585

Montagna, J C; Swift, W M; Smith, G W; Vogel, G J; Jonke, A A

Fluidized bed combustion of coal, which is a method of generating electric power and/or steam from high-sulfur coals, easily meets emission standards for oxides of sulfur and nitrogen. The fluidized bed material (sorbent) reacts with the released sulfur and forms CaSO/sub 4/. Natural stones (limestone and dolomite) are receiving the greatest consideration as the sulfur-accepting sorbent. The feasibility of regenerating (desulfurizing) the sorbent for recycle to lessen the potentially large waste disposal problem is being investigated. Sulfated dolomite from a coal-fired bed combustion process has been regenerated by reductive decomposition with coal in a 10.8-cm-ID fluidized bed reactor. The effects of solids residence time (7 to 35 min), regeneration temperature (1000 to 1100/sup 0/C), and pressure (115 to 153 kPa) on the extent of CaO regeneration and on the SO/sub 2/ concentration in the off gas have been investigated. The extent of regeneration improved at higher temperatures and longer solids residence times. The SO/sub 2/ concentration in the flue gas increased at higher temperatures, shorter solids residence times, and lower pressure. The results have been utilized in a heat- and mass-balance-constrained model to formulate a basis for preliminary process evaluation. Also, it has been found that for three utilization cycles (combustion/regeneration cycles) the reactivity of the dolomite remained at acceptable levels.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 5870585
• Journal Information: AIChE Symp. Ser.; (United States), Journal Name: AIChE Symp. Ser.; (United States) Vol. 176:74; ISSN ACSSC
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION ABATEMENT
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
DOLOMITE
ENERGY SOURCES
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
REGENERATION
RESERVOIR ROCK
ROCKS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES