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ICESP X CONFERENCE PAPER ABSTRACTS 3C SERIES

Held in Cairns, Australia
June 25 - 29, 2006

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 3C Series papers from the X ICESP Conference.  

3C1
REDUCTION OF OZONE GENERATION IN ELECTROSTATIC
PRECIPITATOR
YOSHIYASU EHARA, KEISUKE ITO, YASUHIRO TAKAGI, AKINORI ZUKERAN AND KOJI YASUMOTO

Abstract

The influence of electrode shape on ozone generation in electrostatic precipitator (ESP) has been experimentally investigated. It experimented by using the two-stage-type ESP composed of a precharger and collecting section. In the precharger section, three types of high voltage electrode of a wire, a thin plate, and a saw-tooth were used to experiment. Each ground electrode used a plate. The collecting section had a parallel-plates configuration. The gases exhausted from the diesel engine were diluted with air and introduced into ESP. The electrical characteristics in a corona discharge on each electrode are summarized. The corona discharge luminescence was observed by each electrode type. In the positive corona discharge, the thin plate type electrode has shown low ozone generation compared with the wire type. In the negative corona discharge, the saw-tooth type electrode has also shown low ozone generation compared with the wire type. All current characteristics of the collection efficiency of the wire and the thin plate were almost the same. Those of the wire and the saw-tooth in negative polarity were also almost the same. These results have great practical importance for improving the performance of the two-stage type electrostatic precipitator as it allows the collecting efficiency of the unit to be increased without exceeding the ozone generation.

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3C2  
THE EFFECT OF THE THIRD ELECTRODE ON
THE OZONE GENERATION OF A WIRE-PLATE TYPE NONTHERMAL PLASMA REACTOR WITH A SLIT BARRIER
JAE-SEUNG JUNG, DEOK-HYUN HWANG, TAE-HOON KIM AND JAE-DUK MOON

Abstract

The effect of the third electrode on the ozone generation of a wire-plate type nonthermal plasma reactor, with a slit barrier, has been investigated experimentally. When a third electrode is installed on the slit of the slit dielectric barrier, where the surface corona discharges occurred, it is found that a significantly increased ozone generation could be obtained for negative corona discharge. This, however, indicates that the third electrode can control the discharges, not only the corona-wire discharge but also the slit discharge on the barrier in the plasma reactor. As a result, a naked wire, which is used as a third electrode, significantly influences the fields of the corona wire and the surface charges. An insulator-wrapped wire also has a strong effect on the discharges. As a result, a high amount of the output ozone can be obtained with the third electrode of a naked wire of the open terminal case and an insulator-wrapped wire of a 20-Mohm-resistance, respectively

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3C3  
RELATIONSHIP BETWEEN OZONE FORMATION AND
TOLUENE DECOMPOSITION EFFICIENCY IN A ZEOLITE-HYBRID PLASMA REACTOR
A. OGATA, H.H. KIM, S.M. OH, H. EINAGA AND S. FUTAMURA

Abstract

A zeolite-hybrid plasma reactor showed the excellent performance for the toluene decomposition by the cyclic operations such as long time toluene adsorption followed by short time plasma discharge. In particular, the decomposition efficiency of toluene was enhanced by placing the zeolite in the downward position of the plasma region rather than placing that in the upward position. On the other hand, it was found that the fast electron could not reach in the internal area of the zeolite, which was effective for VOCs plasma decomposition in gas phase. Then, we investigated the reaction mechanism rela ted to active oxygen species by tracing the behavior of ozone formed in the reactor. Actually, the formation of ozone was suppressed in the zeolite- filled region, although the concentration of ozone formed in the plasma region gradually increased in the gas flow direction. That is, the toluene adsorbed on the zeolite was scarcely decomposed in the upward position, while it was readily decomposed in the downward position. These results can be well explained the positioning effect of zeolites, and lead to the conclusion that the synergistic effect of plasma and zeolite was substantially ascribed to the following mechanism; active oxygen species formed by the plasma diffused easily into the micropore, and then promoted the decomposition of C6H5CH3 adsorbed in the internal area.

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