Calcination and sintering models for application to high-temperature, short-time sulfation of calcium-based sorbents
To simulate the staged availability of transient high surface area CaO observed in high-temperature flow-reactor data, the paper describes the rate of calcination of CaCO{sub 3} or Ca(OH)2, using an empirical modification of the shrinking-core model. The physical model depicts particle decomposition by the shrinking-core mechanism. The subsequent time-dependent decrease in CaO reactivity (surface area and porosity) due to sintering is simulated by reducing the grain-center spacing for the matrix of overlapping CaO grains. Information from SEM micrographs and from other physical property measurements of the porous particles is incorporated. The submodel simulates the time-dependent availability and reactivity of CaO for a comprehensive model used to study sulfation of CaCO{sub 3} and Ca(OH)2 particles at upper-furnace injection conditions.
- Research Organization:
- Utah Univ., Salt Lake City, UT (USA). Dept. of Chemical Engineering
- OSTI ID:
- 6146499
- Report Number(s):
- PB-91-116871/XAB; CNN: EPA-R-811001
- Country of Publication:
- United States
- Language:
- English
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AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
CONTROL
DECOMPOSITION
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
MANAGEMENT
MATERIALS RECOVERY
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POROSITY
PROCESSING
PYROLYSIS
REACTION KINETICS
RECOVERY
SIMULATION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE AREA
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
WASTE MANAGEMENT
WASTE PROCESSING