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

9B1
ASSESSING THE SIGNIFICANCE OF THE INDIGO AERODYNAMIC
AGGLOMERATION TECHNOLOGY USING MIE/LIF LASER DIAGNOSTICS
P KALT, G NATHAN, R KELSO, R TRUCEá AND J WILKINSá

Abstrac

A detailed laser diagnostic study has been performed to determine whether aerodynamic mechanisms may be exploited to promote significant agglomeration of fine particles to larger ones, with a view to enhancing the capture of fine and ultra-fine particles in conventional particle collection devices, such as Electrostatic Precipitators. This study was prompted by a series of findings from full-scale trials of a aerodynamic mixing device by Indigo Technologies, which led them to patent technology based on the aerodynamic agglomeration processes.

The study assessed the extent to which the patented Indigo Agglomerator technology achieved an increase in the number collisions between PM2.5 droplets and PM10-50 droplets and, in turn, in the capture of the small by the large droplets using aerodynamic processes. The studies were conducted in the potential core region of a large unconfined jet produced by a wind tunnel contraction. The small water droplets were generated with a TSI atomiser and marked with concentrated Rhodamine 6G dye to allow them to be discriminated from the large droplets. The large droplets were generated by a commercial fine-spray nozzle and were not dyed. Two cameras were used, one to image the fluorescent signal from the fine droplets only, and the other to image the Mie scattered signal from both droplets. The measurements were performed for arrangements with and without the aerodynamic mixing device in place, and with one or both of the droplet streams introduced into the flow. The fluorescent signal from the small droplets is found to decrease significantly, but only for the case where both the large and small droplets are present in the flow along with the aerodynamic device. This clearly shows that the aerodynamic device used in the Indigo Agglomerator technology greatly increases the number of collisions between large and small particles, providing an explanation for the increased capture efficiency found in the industrial-scale Indigo Agglomerator technology.

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9B2 
PROPERTIES, CHARGING PROCESSES AND DEPOSITIONS OF PARTICLES IN ELECTROSTATIC FILTRATION SYSTEMS
MARTIN AMMER AND RUDOLF WOSCHITZ

Abstract

Due to a growing environmental awareness the application of high voltages in environmental technology, in particular of high d.c. voltages, is becoming more and more important. The application this paper deals with is the process of electrostatic air filtration. 

Electrostatic filters share one common feature: particles are charged and attracted by electrical forces; they are led to a collecting electrode. This separation of charged particles in electrostatic fields represents a simple and very efficient possibility of filtering the air. Thefield of application of electrostatic filters comprises medical engineering, tunnel exhaust cleaning, gas cleaning in industrial plants and room air cleaning. A new interesting field is the particle filtering of diesel exhaust fumes, where different methods and technologies are applied. Therefore this paper deals with basics of particle qualities and the qualities of bioaerosols. Viruses and fungus cultures are presented as well. A further field this paper deals with is the charging process and deposition of particles in electrostatic filtration systems, referring to the size, and electrical agility and health risk of particles.

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9B3 
EXPERIMENTAL STUDY ON ELECTROSTATIC PRECIPITATION
WITH SPRAYING CORONA DISCHARGES
HU MANYIN, LIU SONGTAO, GAO XIANGLIN, LI LIFENG1 AND WANG LIQIAN

Abstract

A simulative device was employed. The corona onset saturation, the V-I characteristics and the precipitation efficiency were researched and compared between spraying negative corona discharges and dry negative corona discharges. The experiments shown the precipitation efficiency of spraying negative corona discharges reached to 28% higher than that of dry corona discharge (from 78.2% to 84.2%), under the conditions of the same high voltage and gas flow rate. The new discharge characteristics and precipitation principle were analyzed and discussed. The comparing between spraying negative corona discharges and dry negative ones shown that spraying negative corona discharge is more suitable for removal of particle contamination. The spreading corona plasma of spraying positive corona discharges plays a more important role for purifying the spraying circulating water.

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