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ICESP VII CONFERENCE PAPER ABSTRACTS FP-1 SERIES

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 FP-1 Series papers from the VII ICESP Conference.  

FP01  The Evaluation of Collection Efficiency on Electrostatic Precipitator by Visibility Index

Abstract
Abstract not available

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FP02 Fundamental Principles of Similarity with Reference to the Collection Efficiency of an ESP
Yakov S. Khodorkovsky and Michael R. Beltran
Beltran Associates, Inc.

Abstract
The physical nature of mass transfer in the complex electrodynamic and turbulent flow field is complicated and it has not yet proved possible to set up an accurate equation for the calculation of ESP collection efficiency.  The theoretical drift velocity, which is the most important parameter of the Duetsch equation, differs very much from the effective migration velocity obtained experimentally.  The new concept, discussed in the paper, is based on the theory of dimensional analysis and on a large number of laboratory tests.  This allows us to obtain a universal relationship between collection efficiency and a new ESP nondimensional number which satisfies the conditions of similarity.

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FP03 Onset Voltages of Back Corona for Various Layer Thickness and Gas Temperature in Wire-Cylinder Type Electrostatic Precipitator
H. H. Park, S. S. Kim
Department if Mechanical Engineering, Korea Advanced Institute of Science and Technology

Abstract
We performed the study of the back corona discharge in the wire-cylinder type electrostatic precipitator (ESP) for the various gas temperature and layer thickness.  The well-characterized fluidized bed combustion (FBC) fly ash was used for the test particle.  In this study, the gas temperature was varied from 100oC to 250oC and the layer thickness was varied from 0µm to 301µm.  As increasing the temperature, the back corona starting voltage was decreased.  Also we examined the back corona discharge effect for the different dusty layer thickness.  As increasing the dust layer thickness, the back corona discharge appeared at the higher applying voltage.

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FP04 The Role of Corona Wind in Electrostatic Precipitation
John J. Lowke and Richard Morrow
CSIRO Telecommunications and Industrial Physics

Abstract
The conventional view implied in the term “electrostatic precipitation” is that dust particles become charged from the corona current and then are attracted by electrostatic forces to the collector plates for precipitation.  However, we have come to the view that a significant mechanism in sweeping the dust particles both to and from the plates is that of corona wind.  We have performed measurements of the corona wind in a model precipitator using an optical fibre anemometer.  We obtain velocities of the order of 2 m/s for the corona wind associated with voltages of 50 kV on a conventional electrostatic precipitator wire, which is of the same order of the usual imposed flow velocities of 1 m s -1.  In addition we have performed two dimensional fluid dynamic calculations incorporating corona wind with an imposed cross flow.  An improved design of the plate configuration of electrostatic precipitators is suggested to utilize the effect of corona wind to assist the transport of particles to the plates.

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FP05 Influence of Lypophile on Preventing Re-entrainment in Spraying Surfactant Type Electrostatic Precipitators
Yoshihiro Kawasa*, Wateru Jindai*, Akinori Zukeran*, Yoshiyasu Ehara*, Tairo Ito*, Takeo Takahashi**, Takeshi Takamastu**
* Department of Electrical and Electronics

Abstract
The re-entrainment phenomena by rely of collected diesel exhaust particles (DEP) may be solved by increasing the adhesive force between particles and collecting electrodes.  Therefore, we have proposed Spraying-Surfactant-Type ESP spraying pure water with surfactant in the gases at the upstream of ESP.  As a result, the collection efficiency increased for the particles larger than 1 µm.  However, the mechanism of preventing the re-entrainment due to spraying the water with surfactant has not been clear.

In the work, we investigate the influence of surfactant’s lypophile on preventing the re-entrainment.  The present version of ESP is Two-Stage-Type with the precharger and the collecting section.  The particle size distribution of the electrodes is measured and the agglomerated particles are observed by the scanning electron microscope (DEM).  As results, when high lypophile surfactant is sprayed to the gases at the upstream of ESP, the number of larger particles which are agglomerated on the electrode decreases and the shape these particles becomes nearly spherical.  These results indicate that spraying the high lypophile surfactant to the gases at the upstream of ESP prevents the agglomeration on the electrodes and the re-entrainment.

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