Voltage-current characteristics of plate type precipitator geometry under combined DC/pulse energizations

Abstract

An attempt has been made to study the voltage-current characteristics of a wire-plate precipitator geometry under clean air conditions. Helical wires have been used as corona electrodes. The studies were conducted with DC and DC superposed on nanosecond pulse respectively. The repetitive pulses with a rise time of the order of nanoseconds were generated from a MARX type impulse voltage generator. A comparative study of effect of pulse repetition rate, pulse width and effect of DC bias has been made on the voltage-current characteristics. The obtained results were discussed and compared with previous investigations.

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

“…The study also shows that a t 50 pulses per second, the current density increases exponentially with increase in pulse voltage as compared to that at lower repetition rates. A further insight into these results are presented by the author in [20][21][22]. In the present work, the studies were carried out with a pulse repetition rate of 50, at which good electrical characteristics were obtained.…”

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

“…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.…”

“…Assuming known particle charge density values, (21) is integrated and assuming known ionic charge density, (21) is integrated. The integration of (21) and (22) is repeated iteratively in order to obtain the ionic and particle space charge density values at the nodes located along the axis of the flux tube. The iterative procedure stops when the ionic and particle charge densities calculated at the FE node in two successive iterations are less than a pre-specified error, 1 δ (taken as …”

“…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).…”