Experimental gas-solid reaction kinetics of lime sulfation
Technical Report
·
OSTI ID:5930120
Results from TGA confirmed that sulfation of CaO produces different products at different reaction conditions. In the presence of oxygen, above 740/sup 0/C, the product is all CaSO/sub 4/ and the reaction is first order in SO/sub 2/ concentration. At 836/sup 0/C, the reaction rate constant is 0.076 cm/s with an activation energy of 19.1 kcal/mole. Below 450/sup 0/C, the major product is CaSO/sub 3/ and the reaction is zero order. The zero order reaction rate constant at 450/sup 0/C is 4.2 x 10/sup -8/ cm/s with an activation energy of 15.4 kcal/mole. The grains of CaO obtained by calcining Ca(OH)/sub 2/ contained micropores, with a large number of them around 22 A in radius. The effect of sintering and sulfation on the micropores was studied using mercury porosimetry. At 932/sup 0/C, the solid-state diffusivity was found to be 40 x 10/sup -8/ cm/sup 2//s with an activation energy of 35.6 kcal/mole. Reaction measurements on sintered and unsintered CaO pellets showed that the temperature for maximum conversion increased with either increasing initial porosity or increasing initial grain size. A one-dimensional expanding grain model, applied to the lime pellet sulfation data, fit the data from highly sintered pellets quite well.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5930120
- Report Number(s):
- IS-T-1056; ON: DE83016141
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CALCIUM SULFATES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFUSION
ELEMENTS
FABRICATION
GRAIN SIZE
GRAVIMETRIC ANALYSIS
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PELLETS
POROSITY
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
SINTERING
SIZE
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
VERY HIGH TEMPERATURE
014000* -- Coal
Lignite
& Peat-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CALCIUM SULFATES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFUSION
ELEMENTS
FABRICATION
GRAIN SIZE
GRAVIMETRIC ANALYSIS
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PELLETS
POROSITY
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
SINTERING
SIZE
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
VERY HIGH TEMPERATURE