Calcination of calcium-based sorbents for control of SO/sub 2/ emissions from coal fired boilers

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5750730

Harrison, D J; Newton, G H; Pershing, D W

The paper summarizes the results of an experimental study that focused on the production of high-surface-area materials from various sorbents. (NOTE: Injecting calcium-based sorbents into coal burning utility boilers to control SO/sub 2/ emissions is being considered by the EPA as an acid rain control technology because capital equipment requirements are small and the process is entirely dry. Both theoretical calculations and experimental results indicate that SO/sub 2/ capture is strongly related to the surface area of the calcined sorbent. Thus, an improved understanding of the formation of surface area is required for the complete optimization of the sorbent injection process.) Weight loss and B.E.T. surface area data were obtained as a function of residence time and furnace temperature for 14 different sorbents which were members of 4 distinct classes: limestones, dolomites, hydrated limes, and pressure hydrated dolomitic limes. The results demonstrate major differences between classes of sorbents. In general, the hydrated limes calcined faster and produced higher surface areas than the corresponding carbonates. The dolomitic materials also produced higher surface areas than the comparable calcitic sorbents. Pressure hydrated dolomitic limes performed the best, producing surface areas in excess of 140 sq m/g; the limestones performed the worst.

• Research Organization: Utah Univ., Salt Lake City (USA). Dept. of Chemical Engineering
• OSTI ID: 5750730
• Report Number(s): PB-86-148145/XAB
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID RAIN
AIR POLLUTION ABATEMENT
ALKALINE EARTH METAL COMPOUNDS
ATMOSPHERIC PRECIPITATIONS
BOILERS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONATE ROCKS
CHALCOGENIDES
COMBUSTION PRODUCTS
FOSSIL-FUEL POWER PLANTS
INDUSTRIAL WASTES
LIMESTONE
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POWER PLANTS
RAIN
ROCKS
SEDIMENTARY ROCKS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACES
THERMAL POWER PLANTS
WASTES