High reactivity sorbents for SO/sub 2/ control

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

OSTI ID:5987467

Drehmel, D C; Kirchgessner, D A; Rakes, S L

The paper discusses studies, relating to air pollution control from coal-fired utility boilers, that show that the primary variable affecting sorbent reactivity at high temperature or at low temperature with water droplets is surface area. For the development of high surface area during furnace injection, some limestones appear to be superior to others and can be selected accordingly. Even more striking are the differences in surface area development and sulfur capture between classes of commercially available sorbents. Dolomitic sorbents generally outperform their calcitic counterparts, and hydrates are clearly preferable to carbonates on the basis of SO/sub 2/ capture. It has been shown further that sorbents can be modified in a number of ways to enhance their performance. Limestones can be precalcined to high surface areas and injected downstream from the burner to preserve their reactivity. Calcitic materials can be pressure hydrated to increase their reactivity over atmospheric hydrates, and hydration parameters can apparently be adjusted to increase reactivity even further. Finally, additives are available that promote SO/sub 2/ capture in the full range of calcium-based sorbents, and iron has been identified as an effective promoter with minimal adverse effects when added to the water of hydration for pressure hydrated materials.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (USA). Air and Energy Engineering Research Lab.
• OSTI ID: 5987467
• Report Number(s): PB-86-145794/XAB
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
BOILERS
BURNERS
CARBONATE ROCKS
CHALCOGENIDES
COMBUSTION PRODUCTS
FOSSIL-FUEL POWER PLANTS
INDUSTRIAL WASTES
LIMESTONE
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POWER PLANTS
ROCKS
SEDIMENTARY ROCKS
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
SURFACES
THERMAL POWER PLANTS
WASTES