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Held in Kyongju, Korea
September 20-25. 1998

The International Conference on Electrostatic Precipitation (ICESP) is the official conference of the International Society for Electrostatic Precipitation (ISESP).  

The following is a list of the Abstracts for the PP-3 Series papers from the VII ICESP Conference.  

PP11 Application of Positive Pulsed Corona Discharge to Removal of SO2 and NOX
Young-Sun Mok, In-Sik Nam and Rae-Woong Chang
Environment and Energy Research Division

Removal of SO2 and NOx using positive pulse corona discharge was investigated.  Chemical additives such as ammonia and olefins were used.  Compared to C2H4, C3H6 gave much better performance in the conversion of NO.  We carried out X-ray diffraction and scanning, electron microscope analyses of the products.  Relative importance of each of the active species such as O, OH, HO2 and O3 was evaluated.  Of those species, O3 was found to play a crucial role in the oxidation of NO.  Removal of NOx using ozone was also investigated without applying high voltage to induce non-thermal plasma discharge.  The amount of NO converted was nearly equal to that of O3 added.  Since O3 molecule can be generated with small electrical energy less than 10 eV/O3 molecule, NOx removal using ozone may be more energy efficient.  SO2 could easily be removed by the reaction with NH3 in the presence of water vapor.

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PP12 2-D Numerical Simulation of NOX Chemical Reaction in the Pulse Corona Discharge Process
Youn Taeg Kim and Ki Woong Whang
School of Electrical Engineering
Seoul National University

By a 2-D numerical simulation of positive corona with extensive NOx chemical reactions, two parameters such as E/Neff (effective electric field for electrical energy transfer) and G-factor are calculated.  E/Neff  weakly depends on the relative humidity but strongly depends on the applied voltage.  G-factors of OH, O radicals reach their mexima at E/N ~ 150 Td and G-factor of N radical follows the change of E/Neff .  As the applied voltage increases, the corona formation and propagation time decrease, but the other parameters show very weak dependence.

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PP13 SO2 and CO Removal Characteristics of Nonthermal Plasma Reactor in a Crossed DC Magnetic Field
Jae-Duk Moon, Guen-Taek Lee and Chin-Gon Kim
Department of Electrical Engineering

SO2 and CO gas removal characteristics of a wire-to-cylinder type nonthermal plasma reactor corona-discharged in various applied voltage (-dc, ad, fast rising pulse and high frequency pulse) and a crossed dc magnetic field were investigated.  The experiment has been emphasized on the oxidizing characteristics of SO2 and CO gas by O3 and the applying of a crossed magnetic field, which would induce the cyclotronic and drift motions of electrons making the residual time longer in the removal airgap space.  In addition, it also would enhance the4 energy of electrons and the electrophysicochemical actions to remove the pollutant gases effectively.  It was found that the corona onset voltage and the breakdown voltage decreased with increasing the crossed magnetic field and decreasing initial fed SO2 and CO gas removal rate of 20 – 30[%] can be obtained with –dc, ac and fast rising pulse corona discharges in the crossed dc current-induced magnetic field.  But the high frequency pulse power was not effective to the gas removal for applying of a crossed magnetic field.

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PP14 Development of a New Dry Desulfurization Process using a TiO2 Catalyst And a Non-Thermal Plasma Hybrid Reactor
Hee-Joon Kim and Akira Mizuno
Department of Ecological Engineering
Masayoshi Sadakata
Department of Chemical System Engineering

In the present paper we report the results of our experimental studies of an oxidation reaction of SO2 to SO3.  In order to find out a new dry-type desulfurization process with high efficiency and cost performance, we have designed a reaction process that combines the pulsed streamer corona plasma and the TiO2 catalyst.  Experiments of both gas phase reaction and surface reaction were performed in order to elucidate the mechanism of oxidation of SO2 into SO3.

The main results show that the conversion ration of SO2 to SO3 in the gas phase reaction was only below 5% at low temperatures (under 400oC).  Similarly, the conversion ration using TiO2 as catalyst was negligible under the same reaction conditions.  When the gas phase reaction and the surface reaction were combined, the oxidation ration was almost fixed at about 10% at temperatures below 400oC.  The conversion ration of SO2 into SO3 could be increased significantly, when H2O was added in proportions equivalent to about 0.2% in volume.  When hydrogen peroxide was added, the conversion ratio was remarkable increased as compared to the case where only H2O was added.  A conversion ration of 60% and 90% were achieved respectively when the reaction was not assisted by plasma and when it was.  Finally, these results confirmed our initial hypotheses that the OH radical enhances the oxidation reaction of SO2 in both the gas phase reaction and the surface reaction on TiO2.

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PP15 A New Type Nonthermal Plasma Generation Means Utilizing Ferroelectric Pellets
Jae-Duk Moon, Sang-Taek Geum and Yong-Soo Son
Department of Electrical Eng.
Kyungpook National University.

A new type of nonthrmal plasma reactor utilizing ferroelectric pellets is proposed to generate nonthrmal plasma efficiently, which is used for simultaneous control of various pollutant gases.  Electric charges stored on ferroelectric pellets by corona discharge between corona tip and mesh electrode provide partial electrical discharges among ferroelectric pellets.  These partial electrical discharges can enhance partial discharges around surface of ferroelectric pellets and partial discharge.  Positive and negative dc voltages are applied between corona tip and mesh electrode to generate partial discharge.  Corona currents are estimated to investigate charge storage on ferroelectric pellets as a function of applied time of voltages, polarities of corona discharges.  As a result, it is found that ferroelectric pellets, polarity of applied voltage, and applied time of dc voltage influence the generation of the nonathermal plasma in the plasma reactor.

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