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ICESP X CONFERENCE PAPER ABSTRACTS 2B 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 2B Series papers from the X ICESP Conference.  

2B1
EXPERIMENTAL TEST OF DISCHARGE ELECTRODE FOR
COLLECTING OF FLY ASH OF DIFFERENT PHYSICO-CHEMICAL PROPERTIES
M. JEDRUSIK, A. SWIERCZOK

Abstract

This paper describes experimental test results of selected discharge electrode configuration on ESP fly-ash collection derived from boilers fired with coal and biomass mixtures. According to the new Polish Energy Law energy sector should increase its renewable energy quota up to 5,75% by the end of 2010 year. A new specific type of the after-combustion product should be efficiently collected within the ESP. To estimate the new precipitationís process parameters, series of test were carried out on a bench scale ESP model collecting fly ashes coming from utility boilers fired with lignite and lignite-biomass mixtures. The physical model had active field length of 2 x 1000 mm and 450 mm height with a gas duct spacing of 400 mm. The main goal of the experimental investigation was to assume the dependency of ESP collection efficiency on discharge electrode type, especially when collecting fly-ash generated in utility boilers fired with coal-biomass mixtures. The investigation takes into account the chemical and physical characteristic parameters of the fly ash as well as the mercury content in fly ash as a function of particle size distribution. 

The results has been presented in the form of tables and curves showing the influence of electrical energization, fly ash chemical and physical specific properties and discharge electrode configuration on the total collection efficiency of an ESP.


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2B2  
INFLUENCE OF RE-ENTRAINMENT AND CHARGED PARTICLES
ON PARTICLE DEPOSITION ONTO DOWNSTREAM WALL IN AN ELECTROSTATIC PRECIPITATOR
K.YASUMOTO, A. ZUKERAN, T. KIMURA, K. ITO, K. YUDA,Y. TAKAGI** AND Y. EHARA

Abstract

One application of an electrostatic precipitator (ESP) is decontaminating polluted gases in expressway tunnels to save drivers and environment around tunnels. High collection efficiency is well achieved by a conventional ESP. However, the walls downstream the ESP are polluted due to particle deposition. Although it was thought that the cause was the emission of charged particles from the ESP, authors thought that one of the causes was also particle re-entrainment on the ESP. In this paper, the experiments were carried out to investigate the effect of neutralization on preventing particle deposition. The collection efficiency as a function of particle diameter and the amount of deposited particles on the wall were studied on three types of the ESP, which were the universal ESP under DC operating  mode (DCESP), the ESP under AC operating mode (ACESP) and the ACESP with neutralization. The ACESP is new type that is developed to prevent the particle re-entrainment by authors. The results showed that the collection efficiency of a large particle decreased on the DCESP because of the particle re-entrainment. Although the amount of deposited particles on the DCESP was the greatest, that on the ACESP was low due to preventing particle re-entrainment. The ACESP with neutralizer was most effective to decrease the amount of deposited particles of three types of the ESP, because of the preventing particle re-entrainment and the decreasing the charge amount of gases downstream the ACESP with the neutralization.

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2B3  
EXPERIMENTAL STUDY ON AGGLOMERATION OF
SMOKE PARTICLE IN ELECTRIC FIELD
TANG MINKANG AND LUO SIWEN

Abstract

The agglomeration phenomenon of the charged smoke particle has been investigated by the electric- fluid mechanics and transport theory of external force field and depending on several simplifying assumptions the theoretical expression for the agglomeration rate of the smoke particles has been developed. In a model of electrostatic precipitator the agglomeration mechanism of charged particles has been studied further. It is shown that the agglomeration of the charged smoke particles are affected by charge distribution on the surface of particles, particle size and charge polar of particle, particle charges and so on. No matter single polar corona or bipolar corona the agglomeration of smoke particles will take place but the agglomeration occurring between particles with negative charges and particle with positive charges will be limited within a certain scope.

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