CaO interactions in the staged combustion of coal. Third quarterly technical progress report, April 1, 1981-June 30, 1981. [Reaction with FeS/sub 2/ and with sulfur]

Technical Report · Thu Jul 30 04:00:00 EDT 1981

OSTI ID:6081952

Levy, A; Merryman, E L

The study of the reaction of CaO with FeS/sub 2/ was completed. The reaction was studied in the temperature range from 750 to 1100/sup 0/ and at Ca/S mole ratios of 0.5, 1.0, and 3.0. The extent of reaction was examined at time intervals of 1 to 130 seconds and at longer time intervals of 5 to 15 minutes. Data from the shorter time intervals suggest a zero order reaction based on sample weight loss, and yield an apparent activation energy of 14.3 kcal/mole. The overall chemistry indicates that the CaO is reacting with sulfur vapors from the pyrolysis of FeS/sub 2/ to form CaS and SO/sub x/, the ultimate sulfur oxide being SO/sub 2/. Solid-solid reactions to form FeO or Fe/sub x/O/sub y/ are not apparent. It is apparent, however, that in the absence of oxygen, 50 percent or more of the sulfur in the sample can be retained in the solids as pyrrhotites, Fe/sub x/S/sub y/. Another 10 to 25% of the sulfur may be retained as CaS at the higher temperatures and higher Ca/S ratios. The addition of charcoal to the CaO-pyrite mixture enhanced the retention of sulfur in the solid. Exposing the solid mixtures to N/sub 2/-H/sub 2/O, CO-Ar or CO/sub 2/-Ar gas streams had little effect on sulfur retention. Adding O/sub 2/ to the gas significantly increased SO/sub 2/ formation. 5 figures, 3 tables.

• Research Organization: Battelle Columbus Labs., OH (USA)
• DOE Contract Number: AC22-80PC30301
• OSTI ID: 6081952
• Report Number(s): DOE/PC/30301-3; ON: DE81027490
• Country of Publication: United States
• Language: English

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ACTIVATION ENERGY
AIR POLLUTION ABATEMENT
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
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ENERGY
ENERGY SOURCES
FOSSIL FUELS
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IRON COMPOUNDS
IRON SULFIDES
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ORES
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