Simultaneous removal of SO{sub 2}, NOx, and Hg from coal flue gas using a NaClO{sub 2}-enhanced wet scrubber

A bench-scale study was conducted on the simultaneous removal Of SO{sub 2}, NOx, and mercury (both Hg{sup 0} and Hg{sup 2+}) from a simulated coal flue gas using a wet calcium carbonate scrubber. The multipollutant capacity of the scrubber was enhanced with the addition of the oxidizing salt, sodium...

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Bibliographic Details
Published inIndustrial & engineering chemistry research Vol. 47; no. 16
Main Authors Hutson, N.D., Krzyzynska, R., Srivastava, R.K.
Format Journal Article
LanguageEnglish
Published United States 15.08.2008
Subjects
01 COAL, LIGNITE, AND PEAT
AIR POLLUTION CONTROL
CALCIUM CARBONATES
CHLORINE COMPOUNDS
COAL
COMBINED SOXNOX PROCESSES
FLUE GAS
FOSSIL-FUEL POWER PLANTS
MERCURY
NITRIC OXIDE
OXIDATION
REMOVAL
SCRUBBERS
SODIUM COMPOUNDS
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Summary:A bench-scale study was conducted on the simultaneous removal Of SO{sub 2}, NOx, and mercury (both Hg{sup 0} and Hg{sup 2+}) from a simulated coal flue gas using a wet calcium carbonate scrubber. The multipollutant capacity of the scrubber was enhanced with the addition of the oxidizing salt, sodium chlorite. The results showed a maximum scrubbing of 100% for SO{sub 2} and Hg species and near complete NO oxidation with about 60% scrubbing of the resulting NOx species. The chlorite additive was less effective as an oxidant in the absence of SO{sub 2} and NO in the flue gas. Oxidation of NO and mercury were only about 50% and 80%, respectively, in the case of no SO{sub 2} in the simulated flue gas. The mercury oxidation was similarly affected by the absence of NO in the flue gas.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie800339p