Actions for Continuing development of regenerable sorbents for fluidized-bed combustion. Final report

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Continuing development of regenerable sorbents for fluidized-bed combustion. Final report

Author
Kalfadelis, C. D.
Published
United States : [publisher not identified], 1981
Springfield, Va.: National Technical Information Service, [approximately 1981]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
The fluidized bed combustion of sulfur-bearing coals under presently-constituted environmental constraints requires an efficient sulfur capture system to be cost effective. The system configuration which has received the most attention is one in which combustion is effected in the presence of the sulfur-capture agent, which is itself a fluidized solid, generally limestone or dolomite. This system, however, may be found to be only marginally preferable to more conventional coal combustion methods when natural sorbents, limestones or dolomites, are employed in a once-through process which generates large quantities of partially-sulfated stone as waste by-product. In a previous experimental program (1), Exxon Research and Engineering Company sought to identify superior sulfur sorbents for direct use in fluidized-bed coal combustors. Two classes of promising materials emerged: calcium and barium titanates, and calcium aluminate cement. The titanates exhibited remarkable regenerability, retaining their activity for sulfur capture after repeated cycling from sulfation to regeneration. Formulations based on calcium aluminate cement were found to be especially resistant to attrition in a fluidized bed, while exhibiting good sulfur-capture activity. In this study, the assessment of representative synthetic sorbent materials was extended from the single-pellet laboratory analysis used in the original program to the testing of 100-gram aliquots in a hot, fluidized bed. Procedures for producing kilogram quantities of synthetic sorbent pellets for use in the test program had to be developed. And, a first attempt was made to characterize the ultimate effects of controllable variables in the pellet production process on sulfur activity and resistance to attrition.
Report Numbers
DE83002937; DOE/ET/15166-1238
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC21-79ET15166
OSTI Identifier 6874623
Research organization: Exxon Research and Engineering Co., Linden, NJ (USA).
View MARC record | catkey: 47328817