Separating polydisperse particles using electrostatic precipitators with wire and spiked-wire discharge electrode design--颗粒学报PARTICUOLOGY

Sander, S., Gawor, S., & Fritsching, U. (2018). Separating polydisperse particles using electrostatic precipitators with wire and spiked-wire discharge electrode design. Particuology, 38, 10-17. https://doi.org/10.1016/j.partic.2017.05.014

Separating polydisperse particles using electrostatic precipitators with wire and spiked-wire discharge electrode design

Sören Sander ^a *, Steffen Gawor ^b, Udo Fritsching ^{a b}

a Process Engineering, Stiftung Institut für Werkstofftechnik, Badgasteiner Strasse 3, 28359 Bremen, Germany
b Particles and Process Engineering, University of Bremen, Bibliothekstrasse 1, 28359 Bremen, Germany

10.1016/j.partic.2017.05.014

Volume 38, June 2018, Pages 10-17

Received 27 October 2016, Revised 25 April 2017, Accepted 21 May 2017, Available online 28 October 2017, Version of Record 2 April 2018.

E-mail: sander@iwt.uni-bremen.de

Highlights

• Numerical simulation of electrostatic precipitators with electric wind was performed.

• Particle density and permittivity affected precipitation for submicron and micron sized particles.

• Influence of electrode design on separation efficiency was discussed.

Abstract

Numerical simulations of electrostatic precipitators featuring wire and spiked electrode designs were performed to determine particle behavior and separation efficiency. The applied-voltage mechanism that alters the flow structure of particles through ionic winds and mean electric fields are revealed. Numerical studies throughout the past years have shown these structures for channel and pipe configurations. However, less attention was given to field averaging for the ni,∞t-product and electric field. Our study focuses on this averaging and illustrates relevant differences between multidimensional setups concerning these fields. Turbulence was modeled using the Reynolds-averaged Navier–Stokes equations with a second-order Reynolds-stress-model closure. A high three-dimensionality of the ionic wind-induced turbulence is presented. This leads to an increase in the submicron-particle precipitation rate. The results confirm the dependence of separation efficiency on particle density and permittivity, thereby showing the advantages of spiked wires compared with wire-plate setups used in electrostatic precipitators.

Graphical abstract

Keywords

Electro-hydrodynamic CFD simulation; Electrostatic particle precipitation; Electrode design; Collection efficiency

文章导读