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ICESP VII CONFERENCE PAPER ABSTRACTS MN-2 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 MN-2 Series papers from the VII ICESP Conference.  

MN06  Some Aspects of Flow Skew Technology in ESP Performance Improvement
Marian Sarna
Department of Textile Engineering and Environmental Protection
Technical University ofLOdi Branch in Bielsko Biala

Abstract
 The gas formation substantially influences on ESP performance and a uniform gas flow is a poor conception.  Properly arranged the field velocity of gas inlet and outlet ESP lead to surprisingly increase in ESP efficiency.  In that papers the skew linearly changing velocity profiles has been preferenced.  The presented paper exhibit that some another velocity profiles are the same advantageous for ESP efficiency improvement.  Analysed velocity field configurations are formed in each direction on the velocity field and are easy to realize.

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MN07  Numerical Simulation of Screens in Electrostatic Precipitator Inlets
Jesper P. Simonsen and Niels F. Nielsen I
Department of Energy Engineering, Fluid Mechanics Section
Technical University of Denmark.
Niels N. Ssrensen
Test Station for Wind Thrbines
LeifLind
FLS mi1j~ als

Abstract
The aim of the present study is to investigate the gas flow distribution within precipitator inlets including screens.  The flow distribution is calculated by a two-dimensional numerical model calculating two velocity components and the static pressure within the specified calculation domain.  The model is based on advanced computational fluid mechanical tools giving high resolution of the calculated fields.  The flow field is investigated for two different precipitator inlet geometries, that of a symmetric 45o half apex angle diffuser and that of a bottom inlet diffuser.  Applying drag forces, lift forces and turbulence generation separately, the results indicates that the dominating factor of a precipitator inlet flow control device (e.g. a screen) is drag force.  Moreover, when increasing the screen resistance (decreasing the screen opening area) of a single screen configuration, the study indicate that a transition region of screen designs exists where undesirable flow conditions occur including the well known phenomena of flow washing along a screen.  For more complex geometries, like the bottom inlet diffuser, multiple screen arrangements are necessary in order to control the flow.

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MN08  ESP Performance Prediction and Flow Optimization Using CFD Modeling
W Schmitz, D Gibson
Technology Research and Investigations
L Pretorius
Department ofMechanical and Manufacturing Engineering
Rand Afrikaans University

Abstract
Computational fluid dynamics CFD has become widely accepted by industry as an accurate predictive tool to optimize aerodynamic flows.

Eskom ( South Africa ) over the past five years have extensively applied CFD and, by cross referencing all simulated results t measured data, have gained credibility in the application of this technology.  CFD has been applied to simulate and optimize the flow and particle distribution within electrostatic precipitators.  Past experience in this field has shown that the use of CFD can produce erroneous results specifically in predicting inlet flow distributions.

As one of the largest utilities in the world Eskom has access to different designs of ESPs and extensive test work, i.e. flow distribution tests, has built up an extensive library of data which has been used to correlate CFD results with measured data.  During the past years flow distribution measurements have been carried out on all of Eskom plant including those where modifications were implemented regarding skew flow.  In addition, CFD has been extensively used on non Eskom plant.

This paper details some of the development work conducted by Eskom whereby which errors have become understood and rectified.  Hence accurate predictions of the flow field within an ESP have been performed on seven different plants.

Current work is focused on incorporating all ESP collection dynamics (electrostatic field and forces, dust collection and re-entrainment) into a full CFD model.

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