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ICESP X CONFERENCE PAPER ABSTRACTS 9A 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 9A Series papers from the X ICESP Conference.  

9A1
IMPROVEMENT OF RELIABILITY FOR MOVING ELECTRODE
TYPE ELECTROSTATIC PRECIPITATOR
T. MISAKA, T. OURA, M. YAMAZAKI

Abstract

A moving electrode type electrostatic precipitator, which is equipped with brushes to remove dust from the moving collecting plate surface, is effective in collecting high resistivity dust. The collecting plate of the moving electrode type electrostatic precipitator is divided into strips, coupled with chains and moved by driving wheels. In Japan, 51 units of the moving electrode type electrostatic precipitator have been manufactured since 1979. 

For the moving electrode type electrostatic precipitator, an important factor is to improve the
reliability of the moving component parts such as the movable collecting plate element, the rotating brush, the chain and so on. These parts are refined and the life spans of these parts are evaluated by actual operation results.

There is an upper limit of inlet dust density for the moving electrode type electrostatic
precipitator. Fixed electrode sections are commonly combined as a pre-collector to reduce dust density at a moving electrode section. A collection performance equation has been studied using the combination of fixed electrode sections and a moving electrode section.

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9A2 
SELECTION CRITERIA OF PPS AND PPS/PI BLENDS FOR USE IN POWER STATION APPLICATIONSSELECTION CRITERIA OF PPS AND PPS/PI BLENDS FOR USE IN POWER STATION APPLICATIONS
XU DEXUAN, GAO SHIWANG, SUN YINGHAO, MI JUNFENG, WANG HAIJUN AND PAN ZHENDONG

Abstract

In this paper, experimental investigations on discharge characteristics of magnetically enhanced corona discharges for the purpose of capturing fine aerosol particles are presented. The discharge mechanism during such a process is analyzed. The effects of magnetic enhancement under different magnet flux densities and in positive or negative corona discharges were experimentally compared. The magnetically enhanced effects in different inter-electrode regions were studied. Experimental results demonstrated that magnetic field can efficiently increase the concentrations of both the negative ions and the free electrons under negative corona discharging. The dominant mechanism of magnetic enhancement in corona discharges is that the Larmor precessions of free electrons enhance the ionizations of the gas molecules near the discharge electrode. A reasonable configuration of magnetic enhancement for enhancing corona discharge was formed by permanent magnets with a local strong magnetic field near the discharge electrode. A magnetically enhanced negative corona (MNC) pre-charger was assembled in front of an electrostatic enhancement filter. The influence of the MNC pre-charger on the efficiencies of an electrostatic enhancement filter was measured and compared with that of a conventional corona pre-charger. The free electron charging mechanism of the MNC pre-charger was preliminarily analyzed. The new pre-charging technique is promising for capturing fine aerosol particles in electrostatic enhancement filters or electrostatic precipitators.

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9A3 
LABORATORY RESEARCH ON COLLECTION OF PARTICLES
REENTRANIED FROM CORONA ELECTRODE
HU MANYIN, LIU SONGTAO, GAO XIANGLIN, LI LIFENG1 AND WANG LIQIAN

Abstract

At the exit of electrostatic precipitator, among the escaped particles there have not only neutralized particles, but also particles that remaining negative and positive charges. Sometimes positively charged particles can account for 30%~50% of the total particles escaped. They are formed probably from the reentrainment by corona electrode rapping or from back corona effects. In view of this phenomena, for strengthen the corona electrode capability of capturing positively charged particles; new types of corona electrodes were investigated. It has multi-function of corona discharge, reducing back corona, prevent reentrainment and collect the positively charged particles.

Different types and geometries of corona electrodes were proposed; all of them were featured to add a channel shaped wind buffer, which has the same voltage with the corona wire and located between subsequent corona wires. These buffers can reduce gas flow scouring reentrainments, collect positively charged particles and restrain back corona by electrostatic shielding effect. Bench scale laboratory tests were made to explore their discharging characteristics, current density distributions, etc. Two- dimension flow mathematics models were set up and boundary conditions were confirmed. Using k-eequation, the pure air turbulent flow fields of corona electrodes with and without wind buffers were studied.

Tests shown the shielding benefits of both reducing the gas flow scouring and back corona were more remarkable when the distance between buffer and corona wire became closer. But if too small, the over reducing of corona discharge and breakdown voltage will give reverse effects. By optimizing this distance, a steady, high performance operation can be gotten. Laboratory experiments give the recommended distance was 150mm and the recommended buffer width was 60mm.Pilot and industrial tests of likely shielded corona systems also revealed the same beneficial effects.

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