Studies on the reaction of calcined limestone with sulfur dioxide: Final report, September 1985--January 1988

Technical Report · Fri Apr 01 04:00:00 EST 1988

OSTI ID:6983414

Sotirchos, S V

Experimental studies of limestone calcination and sulfation were carried out using two naturally occurring stones, a dirty limestone and a dolomitic marble. Experiments included initial pore size distribution measurements of the calcined samples by mercury porosimetry, measurements of the initial internal surface area by N/sub 2/ adsorption using a flow-type reaction/adsorption apparatus for gas-solid reaction studies, conversion vs time studies using thermogravimetric analysis, and direct photomirographic examination of the calcined and sulfated samples by scanning electron microscopy. Results showed strong dependence of the sorptive capacity of limestone for removal of SO/sub 2/ on the pore size distribution of the calcined product. Various mathematical models developed by our research group for gas-solid reactions with solid product (random pore and random grain models) were used to analyze the conversion vs time data obtained from the sulfation experiments. To investigate the effects of intraparticle diffusional limitations on the sulfation capacity of calcined limestones, experiments were conducted over a rather wide range of particle size and temperature using two high purity limestone samples. Results showed that the evaluation of limestones proposed to be used as sorbents for controlling SO/sub 2/ emissions from fluidized-bed combustors should be based on the form of the pore size distribution of their calcined product and not on their average structural properties only. 39 refs., 41 figs., 9 tabs.

• Research Organization: Rochester Univ., NY (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-85PC80520
• OSTI ID: 6983414
• Report Number(s): DOE/PC/80520-T9; ON: DE88010508
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ARRHENIUS EQUATION
CALCINATION
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DOCUMENT TYPES
DOLOMITE
EQUATIONS
GRAIN SIZE
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATHEMATICAL MODELS
MICROSTRUCTURE
MINERALS
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POROSITY
PROGRESS REPORT
PYROLYSIS
ROCKS
SEDIMENTARY ROCKS
SIMULATION
SIZE
SOLIDS
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
YIELDS