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

Technical Report · Thu Apr 01 04:00:00 EST 1982

OSTI ID:5279405

Helfritch, D J; Feldman, P L; Ray, A B; Morgan, J R; Hildreth, G A

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.

• Research Organization: Cottrell Environmental Science, Somerville, NJ (USA); High Voltage Engineering Corp., Burlington, MA (USA)
• OSTI ID: 5279405
• Report Number(s): DOE/FE/15079-T1; ON: DE82014500
• Country of Publication: United States
• Language: English

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BEAMS
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DESULFURIZATION
ELECTRON BEAMS
EQUIPMENT
FEASIBILITY STUDIES
FILTERS
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
LEPTON BEAMS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
RADIATION CHEMISTRY
RADIATION EFFECTS
REMOVAL
SCRUBBERS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES