Control of SOx emissions by in-furnace sorbent injection: carbonates vs hydrates
The paper provides high-temperature isothermal data on SO/sub 2/ capture by calcium-based sorbents, obtained in a dispersed-phase reactor for limestones, dolomites, hydrated calcitic limes, and hydrated dolomitic limes as a function of Ca/S molar ratio, temperature, and SO/sub 2/ partial pressure. The experimental results indicate that SO/sub 2/ capture is approximately linearly dependent on Ca/S molar ratio and relatively insensitive to SO/sub 2/ partial pressure above 2000 ppm. SO/sub 2/ capture is a strong function of general sorbent class; dolomitic sorbents are better than calcitic materials on an equivalent calcium basis, and hydrated materials are more reactive than carbonates. Computer-model predictions based on a grain formulation, available fundamental rate data, and measured surface areas accurately predict limestone performance; however, predicted capture for the hydrated sorbents is significantly below that measured experimentally. The measured capture results do, however, generally correlate with the BET surface areas measured when the sorbents were calcined in a muffle furnace at 980 K for 20 minutes with an inert environment.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Chemical Engineering
- OSTI ID:
- 6111899
- Report Number(s):
- PB-86-120219/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM CARBONATES
SORPTIVE PROPERTIES
COMBUSTION PRODUCTS
SORBENT RECOVERY SYSTEMS
HYDRATES
SULFUR DIOXIDE
SORPTION
AIR POLLUTION ABATEMENT
CALCIUM OXIDES
INDUSTRIAL WASTES
MATHEMATICAL MODELS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
WASTES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)