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ICESP X CONFERENCE PAPER ABSTRACTS 3B 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 3B Series papers from the X ICESP Conference.  

3B1
COMPLEX ANALYSIS OF IONIC WIND IN ESP MODELLING
J.M. SUDA, T. IVÁNCSY, I. KISS2 AND I. BERTA

Abstract

Several experimental and theoretical works pointed out that ionic wind that produces secondary flow inside the ESP channel distorts the carrier gas velocity distribution and particle trajectories and hence influences on the precipitation process.

For valid description of the effect of the ionic wind a complex model is necessary that takes into consideration the interaction between the gas flow and the corona discharge. However, traditional ESP models approach this problem usually in a simplified way. One group of the models determines the gas velocity distribution in the ESP channel first and considers it as being constant during the further calculations. Another group of the models is focusing only on the corona induced secondary flow itself, ignoring the operational conditions including the effect of the turbulent gas flow and particle space charges.

To handle the difficulty of the interaction between the gas flow and the ionic wind caused by the corona discharge, a new development of our ESP model has been carried out. With help of the new model complex analysis of ionic wind became possible for different operational conditions. Further development of the present state is needed for examination of parameters that are influenced by the ionic wind induced secondary flow. Coupled electric field, fluid dynamic and also particle transport simulation is under continuous development with the aim of determining the role of the ionic wind in particle transport modelling. Based on the calculated preliminary results already valuable conclusions can be drawn on the effect of the ionic wind in ESP modelling for the single wire sectional model.


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3B2  
THE NEWEST RESEARCH RESULTS FOR COLLECTION OF HIGH
SPECIFIC RESISTANCE DUSTS WITH ELECTROSTATIC PRECIPITATORS
WEIXUE WANG, RUINIAN LI, FENG CAO, AIMIN FANG, SHUJIANCHEN AND AIFANG PEI

Abstract

In this paper the newest results in industrial ESPs for collecting high resistivity dusts are summed up as follows:

(1) The negative resistance zone in the V-A characteristics when back corona occurs is not a inevitable result due to back corona, but due to the characteristics of the energization to the ESP. With modern techniques is able to stop the appearance of the negative resistance zone by accurate recognition of back corona signals, tracking and controlling them. 

(2) Three joint hazards due to electrostatic attractions, electrostatic repulsions and back corona discharges may exist when ESPs are used to collect high resistivity dusts, leading to a far lower precipitation efficiency than that for common dusts.

(3) For collection of high resistivity dusts with ESPs. If accurate recognition of back coronas, tracking and controlling them to increase effective voltage and corona current as a means to increase dust partic le charging can be realized then the structure design of the ESPs and the mode of the energisation would not obey the formula jpd=Es. On the contrary if ESPs with narrow gaps, strong corona cathode wires and the electric field strength same as that in wide gaps ESPs are adopted collection of high resistivity dust can be remarkably increased.

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3B3  
BACK-CORONA MODEL FOR PREDICTION OF ESP EFFICIENCY
AND VOLTAGE-CURRENT CHARACTERISTICS.
G. BACCHIEGA, I. GALLIMBERTI1, V. ARRONDEL, N. CARAMAN AND M. HAMLIL

Abstract

The back-corona discharge is formed by a series of micro-discharges in the air spaces between the partcles of the dust layer deposited on the collecting plates. It starts when the particle resistivity is quite high: it changes the voltage-current characteristics of the electrostatic precipitator and significantly lowers its efficiency.

In the present work, the variation of the voltage-current characteristics, depending on resistivity and particle layer thickness, has been successfully reproduced by a simple electrical circuit model of the dust layer, including a back-corona current generator and the voltage drop across the particle layer.

The model also includes an estimation of the variation of the captation efficiency: as backcorona lowers the ion space charge, the computation of the back-corona current allows to evaluate the variation of the particle charging rate and therefore of their migration velocity.


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