Fluidized-bed regeneration of sulfated dolomite from a coal-fired FBC process by reductive decomposition

Technical Report · Fri Apr 01 04:00:00 EST 1977

DOI:https://doi.org/10.2172/5294431· OSTI ID:5294431

Montagna, J. C.; Vogel, G. J.; Smith, G. W.; Jonke, A. A.

A process for regenerating spent SO/sub 2/ sorbents has been developed on a PDU scale. Tymochtee dolomite that had been sulfated during fluidized-bed combustion of coal is regenerated (reductive decomposition of CaSO/sub 4/ to CaO and SO/sub 2/) by the incomplete combustion of either methane or coal in a fluidized-bed reactor. In the first investigation (methane was the fuel used), the effects of the operating variables (temperature, fluidizing gas velocity, fluidized-bed height, solids residence time, and total reducing gas concentration in the effluent) on the regeneration of CaO and on the buildup of CaS were examined. In the second investigation (coal was the fuel used), the effects of solids residence time (7 to 35 min), regeneration temperature (1000 to 1100/sup 0/C), and system pressure (115 to 153 kPa) on (1) the extent of regeneration to CaO and (2) the SO/sub 2/ concentration in the off-gas were investigated. The extent of regeneration improved at higher temperatures and longer solids residence times. The results from these experiments were analyzed statistically, and an equation for the extent of CaO regeneration as a function of (1) sorbent residence time in the reactor and (2) regeneration temperature was obtained. This equation was used in the third section of this report in a mass and energy constrained model for the regeneration process, and a preliminary process sensitivity analysis has been performed. The fuel burden of sorbent regeneration when a 3 wt. percent S coal is burned in a power generation system has been estimated at 2 to 3 percent.

• Research Organization: Argonne National Lab., Ill. (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5294431
• Report Number(s): ANL-77-16
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
014000 -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
ADSORPTION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COST
DECOMPOSITION
DOLOMITE
ENERGY SOURCES
FLUIDIZED BED REACTORS
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUEL DISPERSION REACTORS
FUELS
HOMOGENEOUS REACTORS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTORS
REGENERATION
RESERVOIR ROCK
ROCKS
SORPTION
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES