Modeling of prebreakdown VI characteristics of a wire-plate electrostatic precipitator operating under combined dc-pulse energization

Abstract

With the advent of pulse energization in electrostatic precipitators, the need for developing a model to simulate the physical processes in the prebreakdown region, at which the precipitator normally operates, is also increasing. The development of such a model helps in predicting the V I characteristics of a precipitator, which will be important to diagnose the electrical problems associated with the precipitator during its operation. The paper reports the details of a proposed model t o predict the V I characteristics of a wire-plate precipitator operating under the influence of repetitive pulses superposed on a dc bias. The model begins with the calculation of space charge density near the HV electrode during the pulse-on period and then proceeds with the drift of space charges in the pulse-off period aided by the dc bias. The pulse duration was-250 ns. The pulse repetition rate was 50 Hz. The predicted results were validated against the experimental results conducted on a laboratory model of a wire-plate precipitator. The studies were conducted for dust free conditions.

Modeling and simulation of the effect of pressure on the corona discharge for wire-plane configuration

“…The ionization and attachment coefficients can well be represented by the equations of the type [20,21]:…”

Using experimental designs for modelling of intermittent air filtration process

“…The modelling of electrostatic precipitator (ESP) has been the subject of many papers [7][8][9][10][11][12][13], but none has used the method of experimental designs which proved to be a good tool for the optimization of such processes. The method used in this paper is to determine a mathematical model for the ESP process of a laboratory model, which will be used to determine optimal values of process factors and also for predicting the outcome of the process for randomly values of the factors.…”

Finite element computation of electric field and charge density of a pulsed energized electrostatic precipitator

“…This new estimate of the total space charge density on the conductor's surface along with the new estimate of E are again used in (21) and (22) to get a new estimate of s ρ on all of the finite element nodes. This process continues and a self-consistent solution is assumed to be obtained when the maximum variation in φ and ρ in two consecutive iterations does not exceed a pre-specified value ( 2 δ taken as 0.1% in this work).…”

“…Cristina and Feliziani [19] proposed a procedure for the numerical computation of the electric field and current density distributions in a dc electrostatic precipitator in the presence of dust, taking into account the particle-size distribution. The performance of WDEP s under impulse voltages has been investigated by many researchers [20][21][22][23][24][25][26]. It has been reported that the application of a pulse energization to electrostatic precipitators has substantial benefits when high resistivity particulate materials are involved.…”