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Development of a combined NO/sub x/SO2 removal system based on ZnO scrubbing technology. Fourteenth monthly technical progress report, July 1-July 31, 1985

Author
Rosenberg, H. S.
Published
United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Nuzum, H. K.

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Summary
The feasibility of a process employing ZnO in a spray dryer to remove simultaneously at least 90% of the SO2 and NO/sub x/ from coal-fired combustion gases was studied. During this period, work began on cycling ZnO between absorption and regeneration to determine reactivity versus the number of heating cycles. There was a loss in ZnO reactivity after heating to 1400/sup 0/F, but the bed was not stirred between cycles. A material balance accounted for recovery of about 70% of the absorbed SO2 during regeneration, but only about 1.5% of the NO/sub x/. The latter may have been converted to N2, N2O, or other highly volatile compounds during the absorption step. The desorption curves for SO2 and NO/sub x/ are in substantial agreement with previous DTA of a spent bed of ZnO. In part because of the lack of NO/sub x/ removal in the pilot plant experiments at PETC, two experiments were performed in Battelle's laboratory-scale spray dryer and baghouse. In one experiment, a 15 wt % slurry of ZnO was fed to the spray dryer; in the other experiment, the bags were precoated with ZnO and tap water was fed to the spray dryer. Excellent SO2 removal was obtained in both cases, but the NO/sub x/ removal was low. However, experimental difficulties make the results questionable. It should be pointed out that the low NO/sub x/ removal was still better than the results at PETC where the NO/sub x/ removal was essentially zero.
Report Numbers
DE85016921; DOE/PC/60264-T1
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC22-83PC60264
OSTI Identifier 5462623
Research organization: Battelle Columbus Labs., OH (USA).
View MARC record | catkey: 47357257