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ICESP VII CONFERENCE PAPER ABSTRACTS DE-3 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 DE-3 Series papers from the VII ICESP Conference.  

DE11  Current Distribution and Re-entrainment of Low Cohesive Dust B.H. Ham, S.C.Moon, T.S.Byun,
Eivin L.Christensen, Karsten S. Poulsen and LeifLind
FLS milje a/s

Abstract
 Electrostatic precipitator electrode geometry is still an item of great interest to the designer and especially the discharge electrode geometry has been subject to discussion, practically as well as theoretically.

Behind the geometry lies the demand for a proper current distribution on the collector plate, i.e. the ideal is supposed to be an even current distribution, particularly important if the dust layer on the plate is high resistive.

But also in cases of low resistivity and a loosely compressed or a low cohesive dust layer an insufficient current distribution may cause problems with low precipitator efficiency due to re-entrainment from low current density regions.  The present paper reports a case story describing a non-optimal combination of discharge electrode geometry, low resistive fluffy dust, and average current density.  It is attempted to explain the physics involved based upon results from high resistive operation and upon the importance of the secondary flow induced by the ion wind.

Even though very efficient rapping removes some of the causes of re-entrainment of fluffy dust, because the dust layer is kept very thin, it will be demonstrated that a well designed electrode geometry may prevent perceptible re-entrainment to arise at all.

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DE12  Study on Bi-Electrodes Alternative Discharge Multiple Cascade Impacting Electrostatic Precipitator
Zhuyun Xu and Xiuli Lin
College ofResources and Civil Engineering
Northeastern University

Abstract
Experimental research with three different discharge ways is carried out in a multiple cascade impacting electrostatic precipitator (abbr. to MCI-ESP) model.  Under the conditions of 1-3.5m/s airflow velocity and 20KV discharge voltage, the bi-electrode alternate discharge way has obvious higher dust removal efficiency than that of positive or negative discharge way only, and especially for fine particles whose diameters are less than 5 micrometers.  The main reason is that the b i-electrode alternate discharge way makes use of both the inertial and electrostatic forces to the largest extent.  Contemporary, attractive merging of different polarity particles charged increases collection opportunity of them.  Based on the experimental results, a bi-electrode alternate discharge MCI_ESP will be designed only 0.5 times as large as the single electrode discharge ones for the same flue gas rate treated and the same dust removal efficiency.

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