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Removal of SO/sub 2/ and NO/sub x/ from flue gas by means of a spray dryer/electron beam combination : a feasibility study

Author
Helfritch, D. J.
Published
United States : [publisher not identified], 1982
Springfield, Va.: National Technical Information Service, [approximately 1982]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Feldman, P. L., Hildreth, G. A., Morgan, J. R., and Ray, A. B.

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Summary
This study examines the feasibility of adding an electron beam between the spray dryer and the fabric filter of dry scrubber flue gas desulfurization (FGD) systems. The beam promises effective removal of nitrogen oxides (NO/sub x/) and sulfur dioxide (SO/sub 2/), even at higher coal-sulfur levels than usually economic for dry scrubbers. The beam excites gas molecules, promoting reactions that convert SO/sub 2/ and NO/sub x/ to acids that then react with calcium compounds and are removed by the filter. Concerns examined here are feasibility and waste disposal. The cost findings are promising for both manufacture and operation. The system uses commercially available components. The relatively low temperatures and high humidity downstream of the spray dryer favor economic beam operation. The beam removes SO/sub 2/, so the dryer can be run for economy, not high removal. The beam's incidental heating effect reduces reheat cost. Safe landfilling of the nitrate-rich waste appears practical, with leachate carrying no more nitrate than natural rain and dustfall. We expect natural pozzolanic reactions between alumina-silica compounds in the fly ash and lime compounds from the spray dryer to form an impermeable concrete-like material within 10 days after landfilling. Dry scrubber with electron beam appears competitive with commercial FGD systems, and we recommend a pilot scale operation.
Report Numbers
DE82014500; DOE/FE/15079-T1
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: FC01-81FE15079
OSTI Identifier 5279405
Research organization: Cottrell Environmental Science, Somerville, NJ (USA).
Research organization: High Voltage Engineering Corp., Burlington, MA (USA).
View MARC record | catkey: 47327337