[Formula Omitted] Reduction for [Formula Omitted] Removal Using Wet-Type Plasma Reactor

The fundamental characteristics of flue gas cleaning for [Formula Omitted] using a wet-type plasma reactor are evaluated, with attention being laid on concentrations of nitrate and ammonium ions in the liquid. The wet-type plasma reactor of the wire-cylinder configuration driven by a square-wave hig...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2010-11, Vol.46 (6), p.2165
Main Authors: Thagard, Selma Mededovic, Kinoshita, Yohei, Ikeda, Hiromitsu, Takashima, Kazunori, Katsura, Shinji, Mizuno, Akira
Format: Article
Language:English
Subjects:
Flue gas
Nitrates
Plasma
Online Access:Get full text
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Summary:The fundamental characteristics of flue gas cleaning for [Formula Omitted] using a wet-type plasma reactor are evaluated, with attention being laid on concentrations of nitrate and ammonium ions in the liquid. The wet-type plasma reactor of the wire-cylinder configuration driven by a square-wave high voltage was used. A thin liquid film was maintained on the inner wall of the reactor. In this reactor, a discharge plasma oxidizes NO to [Formula Omitted], and [Formula Omitted] is dissolved into the liquid as [Formula Omitted]. Continuous absorption of nitrogen oxides induces saturation and acidification of the liquid, therefore inhibiting further absorption. The effect of the addition of ammonium ions [Formula Omitted] into the liquid film on the enhancement of [Formula Omitted] removal has been experimentally confirmed. In that case, the addition of [Formula Omitted] was effective for NO oxidation, as well as [Formula Omitted] absorption into the liquid, resulting in the increase of [Formula Omitted] and [Formula Omitted] concentrations in the liquid. With the presence of [Formula Omitted] ions in the liquid exposed to the discharge plasma, a reduction of [Formula Omitted] to [Formula Omitted] takes place. The reduction of nitrate ions to ammonia raises the solution pH and ensures continuous [Formula Omitted] absorption. These results suggest the possibility of the continuous operation of the wet-type plasma reactor for [Formula Omitted] removal without excess acidification of the absorbing water. The process that is responsible for the reduction of nitrate ions into ammonium ions is of an electrochemical nature.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2010.2071230