Criteria for the selection of SO/sub 2/ sorbents for atmospheric pressure fluidized-bed combustors. Volume 2. Tasks II and III report: experimental work, sorbent selection technique. Final report, November 1, 1976-July 31, 1977

Technical Report · Sat Dec 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/5495197· OSTI ID:5495197

Ulerich, N. H.; O'Neill, E. P.; Alvin, M. A.; Keairns, D. L.

Five limestones were tested in the laboratory to evaluate their suitability as sulfur removal sorbents in atmospheric pressure fluidized-bed combustion. Physical characterization of the sorbents (grain size and pore-volume distribution) and chemical analyses were followed by reactivity tests in a thermogravimetric (TG) apparatus and by batch sulfation in a fluidized-bed unit. The distribution of sulfur in the sulfated products was determined by an electron microprobe. Reactivity studies covered a range of particle sizes, temperatures, and precalcination treatment. The reactivity data from TG and fluidized-bed studies were compared and found to be consistent, and the desulfurization data correlated well with the Babcock and Wilcox results on a fluid-bed coal combustor. The data were used to project the effect of operating variables (bed height, superficial velocity, and coal sulfur content) on the limestone consumption required for desulfurization. Analysis of the data does not reveal an a priori basis for selecting sorbents, but sorbent performance can be projected after TG tests. A standard sorbent selection procedure is recommended. It is also recommended that the self-consistent body of data collected be analyzed using a currently available mathematical model of the gas/solid reaction.

• Research Organization: Westinghouse Research and Development Center, Pittsburgh, PA (USA)
• OSTI ID: 5495197
• Report Number(s): EPRI-FP-1307(Vol.2)
• Country of Publication: United States
• Language: English

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