Comparative SO sub 2 reactivity of CaO derived from CaCO sub 3 and Ca(OH) sub 2
In an effort to develop a low-cost retrofit technology for control of sulfur dioxide (SO{sub 2}) emissions from coal-fired utility plants, boiler injection of dry calcium-based sorbents to form calcium sulfate (CaSO{sub 4}) has been widely studied. The effects of such parameters as injection temperature, sorbent surface area, and SO{sub 2} concentration on the reaction between the active species, calcium oxide (CaO), and SO{sub 2} are well documented. One such parameter of particular interest is the chemical parentage of the active sorbent. In pilot-scale studies, CaO derived from hydrated lime, Ca(OH){sub 2}, has been found to be more reactive than that from the respective limestone, CaCO{sub 3}. The paper gives results of a comparison of experimental data on sulfation rates of CaO particles derived from CaCO{sub 3} with those derived from Ca(OH){sub 2} using a product layer diffusion control model differing only in the shape of the CaO grain. Both the model and the experimental data indicate slightly higher reactivity for the Ca(OH){sub 2}-derived oxide due to the observed difference in grain shape. The effect is proposed as a contributor to the greater performance of Ca(OH){sub 2} in pilot scale SO{sub 2} removal studies.
- Research Organization:
- Acurex Corp., Research Triangle Park, NC (USA)
- OSTI ID:
- 5743604
- Report Number(s):
- PB-89-197776/XAB
- Country of Publication:
- United States
- Language:
- English
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20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ADSORBENTS
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SULFATES
CHALCOGENIDES
CONTROL
DESIGN
FOSSIL-FUEL POWER PLANTS
FUNCTIONAL MODELS
INDUSTRIAL WASTES
LIME-LIMESTONE WET SCRUBBING PROCESSES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PERFORMANCE
PILOT PLANTS
POLLUTION CONTROL
POWER PLANTS
SCRUBBING
SIZE
SORPTIVE PROPERTIES
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMAL POWER PLANTS
WASTES