Analysis of corona discharges in cylindrical topology and particle charging mechanisms for optimisation of precipitation efficiency : oral presentation

Timoshkin, Igor and Mermigkas, Athanasios and Given, M and Wang, Tao and Wilson, Mark and MacGregor, Scott; (2012) Analysis of corona discharges in cylindrical topology and particle charging mechanisms for optimisation of precipitation efficiency : oral presentation. In: Proceedings of the IEEE International Power Modulator and High Voltage Conference, San Diego, USA. IEEE, USA, p. 408. (In Press)

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Abstract

In the recent work an impulsive micro-electrostatic precipitation technology has been investigated. This technology combines a DC high voltage with sub-microsecond high voltage impulses to energise the electrodes of the precipitator. The present paper examines corona discharges in cylindrical topologies for optimisation of the electrostatic precipitation process. Analytical analysis of the corona discharges has been conducted and the space-charge saturated current in the cylindrical topology has been obtained using the Poisson and the continuity equations. The Peek's phenomenological approach has been used for calculations of the corona ignition voltage and evaluation of the depth of the ionisation zone in the cylindrical reactor. Analysis of charging of micron and sub-micron particles with different conductivies has been conducted using the analytical Cochet approach which takes into account the field and diffusion charging mechanisms. Based on these data, the particle migration velocities and efficiency of precipitation of particulate matter have been calculated. This analysis shows that problematic particles with dimensions in the range 100-1000 nm have minimum velocities which results in the reduction in their precipitation efficiency. Analytical results are compared with the experimental data which confirms a lower efficiency for 400-650nm particles. The paper discusses potentials solutions which will help to improve efficiency of electrostatic precipitation of sub-micron particles as these particles attracted attention due to environmental and health risks which they pose. These solutions include impulsive energisation of high voltage electrodes and double-stage precipitation reactors.

ORCID iDs

Timoshkin, Igor ORCID logoORCID: https://orcid.org/0000-0002-0380-9003, Mermigkas, Athanasios ORCID logoORCID: https://orcid.org/0000-0002-2450-0101, Given, M ORCID logoORCID: https://orcid.org/0000-0002-6354-2486, Wang, Tao ORCID logoORCID: https://orcid.org/0000-0003-3054-0772, Wilson, Mark ORCID logoORCID: https://orcid.org/0000-0003-3088-8541 and MacGregor, Scott ORCID logoORCID: https://orcid.org/0000-0002-0808-585X;
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