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ICESP VII CONFERENCE PAPER ABSTRACTS FP-2 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-2 Series papers from the VII ICESP Conference.  

FP06  An Analysis of the Effect of Carbon in Ash Levels on ESP Performance
Clive Cottingham
Lodge Sturtevant Ltd. - Subsidiary of FLSmiljo

Abstract
The ever increasing demand of the Environmental Agencies has lead to the widespread use of Low NOx Burners by Power Station Utilities.  This has resulted in a general increase in the levels of Unburnt Carbon in the Fly Ash passed to the Gas Cleaning Plant.  The most commonly used Particle Cleaning device on Utility Boilers is the Electrostatic Precipitator.  High Carbon in Ash can lead to poor Precipitator performance.  The effect of high Carbon levels on a number of plants having high and low resistivity fly ashes, has been investigated.

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FP07 Experiment on Collection Characteristics of 2-Stage Parallel-Plate ESP in 0.01-0.1       m Particle Size Range
Kyung-Hoon Yoo
Air-Condintioning and Refrigerating Research Team Korea Institute of Industrial Technology
Hyoseok Lee, Mansoo Choi and Joon-Sik Lee
Department of Mechanical Engineering Seoul National University
Myung-Do Oh
Department of Mechanical Engineering University of Seoul

Abstract
The fractional efficiency of a 2-stage parallel-plate ESP was measured with fine NaC1 particles in the size range of 0.01-0.1 m.  The experimental results showed that the fractional efficiency increased with decreasing particle size and then began to decrease from the range between 0.02-0.03 m, resulting from the partial charging phenomenon where some of the incoming particles are not charged at all.  This fact indicates the existence of a particle size showing a maximum fractional efficiency in the fine particle sizes.  The existence of those particle sizes was confirmed through the experiment.  It was also observed from the experimental results that the particle size decreases when the corona wire voltage increases.

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FP08 Field Test of An Electrostatic Precipitation Unit for Road Tunnel
Kyung-Hoon Yoo
Air-Condintioning and Refrigerating Research Team Korea Institute of Industrial Technology
Kyung-Eung Tae
Dong-Suh Environment Technology Co.
Myung-Do Oh
Department of Mechanical Engineering University of Seoul

Abstract
Field performance test of an electrostatic precipitation unit has been carried out to evaluate its adaptability to road tunnels.  The selected toad tunnel for the field test was the 3rd Nam-San tunnel in Seoul .  He type of the electrostatic precipitation unit was 2-stage parallel-plate type with a charging section.  The tested were the dust collection performance variation with time using the Atmospheric dust-spot efficiency procedure of the ASHRAE standard 52.1, the size distribution of the collected dust on collection plates and the optimum period for cleaning the collection plate.  The results showed that the initial efficiency was 86.5% and the 7 days-elapsed 85.8% for the nominal air velocity of 6m/s, indicating relatively good agreement with numerical results.  The optimum cleaning period was selected as 7 days.  The amount of collected dust was 518g/unit and the size distribution of the collected dust covered from 0.14 m to 249 m with geometric mean of 17.51 m.

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FP09  Characteristics of a Model Two-Stage PrecipitatorJohn J. Lowke and Richard Morrow
Kazutoshi ASANO, Chang-rag CHOI and Kyoko YATSUKA
Yamagata University
Hun-chan LIM
Taegu Technical Junior College

Abstract
A compact ESP of two-stage type is widely used in working environment where the production of ozone is extremely prohibited.  Since the working space in small factories is limited, the ESPs are required to be compact and to handle highly contaminated air.  Thus, the high efficiency of a precipitator is very important factor.  We have investigated the fundamental characteristics of a model two-stage ESP, where the relative position of the ionizer and the collector electrode section can be changed.  The experimental investigation revealed many interesting results: The electric field in the collector electrodes affects the corona discharge of the ionizer.  The concentration of particles after collector remarkable varied in the region between the high voltage and grounded electrodes.  The precipitation efficiency right behind the high voltage electrode is much greater than that behind the grounded one.  The total precipitation efficiency, calculated by integrating the particle concentration in whole measuring region, is greater when the high voltage electrode of the collector is located behind the discharge electrode.  Thus, the relative position of the ionizer and collector electrodes affects the precipitation characteristics.

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FP10 Influence of Contaminated Discharging Electrode and Collection Plates on Particle Collection Characteristics of ESP
S. H. Kim and K. W. Lee
Kwangju Inistitute of Science and Technology Department of Environmental Technology and Engineering

Abstract
Electrostatic precipitators (ESPs) are one of the most commonly employed particulates control devices for colleting fly ash emission from boiler, incinerators and from many other industrial processes.  They have many advantages of operating in a wide range of gas temperature and achieving high particle collection efficiencies compared with mechanical devices such as cyclones and bag filters.  Generally, the collection efficiency of ESP decreases as the discharging electrode and collection plates are contaminated with particulates.  Thus, a rapping system is needed for removing the collected particulates periodically.  While there have been numerous theoretical and experimental studies on particle collection characteristics of electrostatic precipitators, relatively a small number of the studies addressed the affects of particle accumulation at the discharging electrodes and the collection plates.  Both phenomena are known to influence adversely the performance of electrostatic precipitators.  In this study, a bench scale electrostatic precipitator was designed, built and operated in a wind tunnel.  The influence of particle accumulation at the discharging electrode and at the collection plates was experimentally studied.  The optimum ESP operating conditions were south for maintaining relatively high collection efficiency during particle accumulation.

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