Regeneration of sulfated dolomite from a coal-fired FBC process by reductive decomposition of calcium sulfate in a fluidized bed. [9 refs]

Journal Article · Fri Apr 01 04:00:00 EST 1977 · Ind. Eng. Chem., Process Des. Dev.; (United States)

DOI:https://doi.org/10.1021/i260062a013· OSTI ID:7303592

Montagna, J C; Lenc, J F; Vogel, G J; Jonke, A A

Dolomite or limestone is sulfated when used as a sulfur-sorbent in the fluidized bed combustion of high sulfur coal. Dolomite that was sulfated by this process was regenerated for subsequent reuse as a sorbent to CaO . MgO by reductive decomposition in a fluidized bed. Regeneration was accomplished by the incomplete combustion of methane in a fluidized bed of sulfated dolomite to generate the heat and the required reducing gases for the reactions at 1010 to 1100/sup 0/C. Experimental results indicate that at the conditions studied, the use of shallower fluidized beds, lower fluidizing-gas velocities, and higher reaction temperatures increased both the extent of regeneration and the SO/sub 2/ concentration in the effluent gas. Dolomite losses due to attrition ranged from 5 to 15 percent. When regenerated dolomite was resulfated, it was found that the dolomite that had been regenerated in the high-temperature (1100/sup 0/C) experiments was less reactive as a sulfur acceptor than was dolomite that had been regenerated at a lower temperature (1040/sup 0/C). Nevertheless, the reactivity of dolomite samples regenerated at all temperatures compared favorably with that of virgin dolomite.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 7303592
• Journal Information: Ind. Eng. Chem., Process Des. Dev.; (United States), Journal Name: Ind. Eng. Chem., Process Des. Dev.; (United States) Vol. 16:2; ISSN IEPDA
• 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
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHEMICAL REACTIONS
COAL
COMBUSTION
DOLOMITE
ELEMENTS
ENERGY SOURCES
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NONMETALS
OXIDATION
OXYGEN COMPOUNDS
REGENERATION
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
SORPTION
SULFUR
THERMOCHEMICAL PROCESSES