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ICESP VI CONFERENCE PAPER ABSTRACTS MODELING SERIES

Held in Budapest, Hungary
June 18-21, 1996

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 Modeling Series papers from the VI ICESP Conference.  

107 - An Efficient Pseudo-Transient Solution Method for Monopolar Corona with Charge
AJ.Medlintt , C.A.J.Fletehert and R.Morrow

Abstract
No Abstract Available

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113 - Precipitation Modeling by Calculating Particle Tracks in Simulated Flow Fields
Claus Riehle

Abstract
The work introduces into the method of tracking particles in simulated flow fields.  It is demonstrated, how a commercial tool for flow field simulations can be used to model particle collection in ESPs.  The simulated particle trajectories agree better with experimental observations than the Deutschian assumption of ideal mixing in precipitator ducts.

For a 200 mm duct with given operating conditions and a given particle size distr Fig. 2ibution the local mall fluxes of collected particles have been simulated.  The curve of collected mass complies with industrial experiences of high collection at the beginning of the ESP and a rapid decrease further downstream.

For a lab-scale precipitator the grade efficiency was simulated with different particle tracking models and compared to other models and experiments.

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124 - Removal of Submicrometer Dust Particles by a Charged Spherical CollectorNorman Plaks
Jaworek A., Krupa A., Adamiak K.

Abstract
A numerical model for determining 3D trajectories of charged dust particles in the vicinity of a falling down, oppositely charged spherical collector (a droplet) is presented.  A new definition of the collection efficiency is also proposed.  The model is applied to determine the limiting collision trajectories for dust particles, the precipitation space and collection efficiency for a single charged spherical collector.
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130 - A Model of the Non-Stationary Charge Flow in an Electrostatic Precipitator Unit
A.M. Meroth, T. Gerber, C.D. Munz, A.J. Schwab

Abstract
 In this paper, the authors present a numerical model based on the combination of finite element and finite volume techniques for the self consistent coupling of Poisson’s equation and the non-stationary current continuity equation.  The numerical methods are based on high-resolution schemes developed in computational fluid dynamics.  They represent a new approach in electrical engineering and especially in electrostatics.

The continuity equation (conversation of charge) is solved in non-stationary form by means of a second order finite volume scheme for arbitrary non regular grids.  Time integration is performed either by a very robust explicit approach or by an implicit method where large time steps may be chosen without restriction by the CFL condition.  The finite volume mesh is obtained from the topological dual of the triangulation used for the finite element computation of Poisson’s equation.  The presented method permits modeling of the propagation of charge pulses in precipitators with pulsed energization.


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137 - Effective Solution of 3D Charge Coupled Problems in Electrostatic Precipitators
A.M. Meroth, S. Nicolaus, P.L. Levin t , A.J. Schwab

Abstract
 The solution of charge coupled problems in electrostatic precipitators by coupling of a finite element and an upstream finite volume approach, known as the Donor-Cell method, has been proved to be stable and reliable for two dimensional problems. 

Basically, the calculation consists of an iterative loop in which the Poisson equation and the continuity law of the current are solved and mutually corrected until convergence.

In order to model a three dimensional electrostatic precipitator, tens of thousands of elements are required.  However, the problem can be reduced by splitting the solution into the homogeneous solution of the boundary value problem and the solution of the inhomogeneous problem with boundary conditions set to zero.  This idea implies empowering the linear equation solvers presented in this paper.

We describe algorithms which use the above techniques of calculating ion flow patterns in electrostatic precipitators (ESPs) with arbitrarily shaped coronating electrodes.  Finally, we discuss the problem of considering the corona behavior in order to obtain a realistic representation of the charge injection at the high voltage electrode.


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144 - Discharge of Impulse Series in Presence of Space Charges
T. Barbarics, A. Ivanyi

Abstract
 This paper deals with the determination of the electric field of an electric precipitator on the basis of the R-functions.  The behavior of the equipment under impulse excitation is investigated in the frame of corona discharge simulation.  The excitation with time constants is treated for the determination of the electric field.


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154 - A Finite Element Method for Modeling 3D Field and Current Distributions in
J A Houlgreave, K S Bromley & J C Fothergill
Department of Engineering, University of Leicester

Abstract
 No Abstract Available


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166 - Three-Dimensional Corona Current Distribution in Complex ESP Configurations
Walter Egli and Ulrich Kogelschatz
ABB Corporate Research
Torsten Persson
ABB Flakt Industri AB

Abstract
 A simple physical corona model is presented that makes use of the effective ionization coefficient of the medium to define a local ignition criterion for the formation of active corona regions at the high voltage electrode.  Detailed predictions about the current density distribution in a specially shaped duct with a set of unequally spaced helical corona electrodes are compared with current density distributions measured at the collecting plates.


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172 - Advance of Field Calculation Method in Electrostatic Precipitators with Non-Cylindrical Corona Electrodes
I.P.Vereshchagin, A.A.Beloglovsky, V.S.Morozov
Moscow Power Engineering Institute, High Voltage Engineering Dept.,

Abstract
 The digital simulation of unipolar corona discharge is considered. Distribution of the initial field strength on the surface of corona electrode with variable radius is investigated. The modification of the method of corona discharge field calculation is presented by the authors. Computation results for electrostatic precipitator and electrogasdynamic generator nozzle are
shown.


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178 - Numerical Computation of Ionized Fields in Electrostatic Pulse Powered
N/A

Abstract
 No Abstract Available


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184 - Modeling of the Velocity Field in Electrostatic Precipitators
Maria Jedrusik
Institute of Heat Engineering and Fluids Mechanics

Abstract
 The presented method contributes to the solution of problems concerning uniformity of gas distribution in a retrofitted horizontal electrostatic precipitator.  In this approach gas flow is described by means of a physical model which uses air to simulate transport phenomena.  Results are presented graphically.


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190 - Motion of Macroscopic Particles in Electric Field
MARTON Karol, DZMURA Jaroslav, DOLNfK 8ystrlk
Technical University of Kosice

Abstract
 In this paper the conditions which are suitable for separation of macroscopic particles in ac high voltage electric field are analyzed.  Motion equations of particles creating space are solved according to statement of power effects affecting in the transport area.  In this case we suppose that particles enter into the electric field with initial velocity.

Dust particles are charged in surroundings of electrode system with small radius of curvature.  Coronary electrode has the shape of sharp cone and it is made of metal needle covered with dielectric.  Collector electrode is made of metal.  Occurrence of monopolar charge in surroundings of combined coronary electrode is discussed in this paper and it is given the physical analysis of this phenomena.  In the conclusion of this paper the results obtained by separation of selected dust are introduced.  Theoretical considerations are supported by experiment.


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