Simultaneous oxidation of NO, SO2 and Hg0 from flue gasby pulsed corona discharge
XU Fei , LUO Zhongyang , CAO Wei , WANG Peng , WEI Bo , GAO Xiang , FANG Mengxiang , CEN Kefa
DOI:
Received April 18, 2008,Revised July 15, 2008, Accepted , Available online
Volume 21,2009,Pages 328-332
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A process capable of simultaneously oxidizing NO, SO2, and Hg0 was proposed, using a high-voltage and short-duration positive
pulsed corona discharge. By focusing on NO, SO2, and Hg0 oxidation e ciencies, the influences of pulse peak voltage, pulse frequency,
initial concentration, electrode number, residence time and water vapor addition were investigated. The results indicate that NO, SO2
and Hg0 oxidation e ciencies depend primarily on the radicals (OH, HO2, O) and the active species (O3, H2O2, etc.) produced by
the pulsed corona discharge. The NO, SO2 and Hg0 oxidation e ciencies could be improved as pulse peak voltage, pulse frequency,
electrode number and residence time increased, but they were reduced with increasing initial concentrations. By adding water vapor,
the SO2 oxidation e ciency was improved remarkably, while the NO oxidation e ciency decreased slightly. In our experiments, the
simultaneous NO, SO2, and Hg0 oxidation e ciencies reached to 40%, 98%, and 55% with the initial concentrations 479 mg/m3, 1040
mg/m3, and 15.0 g/m3, respectively.
