An investigation of fundamental processes in electrostatic precipitators
An investigation of fundamental processes in electrostatic precipitators
Electrostatic precipitators have been widely used industrially in the removal of particulates from process gases for many years. However, many aspects of precipitator operation remain to be evaluated. This thesis is concerned with a study of fundamental processes in electrostatic precipitators. The electric field is an important parameter which determines particle charge, charging rate and migration velocities. A probe has been developed which enables the electric field to be determined from potential measurements. The electric field in a laboratory electrostatic precipitator was studied. Where comparison of results with theory was possible, good agreement was obtained. Dust contamination on electrodes was found to cause a significant change in the electric field, which was attributed to an increase in the corona discharge current. The corona current is itself an important quantity in particle charging. The discharge associated with different electrode types and the effects of dust contamination were therefore investigated. Variations in the current density were studied at the collector surface, using segmented electrodes, and in the interelectrode region, using a ballistic probe technique. The results were expected to have important implications on particle charging. Electrode performance was subsequently evaluated using the technique of laser-Doppler anemometry to measure particle velocities. Test dusts in two size ranges were used in order to separate the influence of aerodynamic and electrical forces. Mean particle charges were estimated from components of mean velocity due to the electrical force and measurement of the electric field. From the results of experiments using commercial electrodes, a development electrode has been constructed and preliminary evaluations performed.
University of Southampton
1984
Coventry, Paul Francis
(1984)
An investigation of fundamental processes in electrostatic precipitators.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Electrostatic precipitators have been widely used industrially in the removal of particulates from process gases for many years. However, many aspects of precipitator operation remain to be evaluated. This thesis is concerned with a study of fundamental processes in electrostatic precipitators. The electric field is an important parameter which determines particle charge, charging rate and migration velocities. A probe has been developed which enables the electric field to be determined from potential measurements. The electric field in a laboratory electrostatic precipitator was studied. Where comparison of results with theory was possible, good agreement was obtained. Dust contamination on electrodes was found to cause a significant change in the electric field, which was attributed to an increase in the corona discharge current. The corona current is itself an important quantity in particle charging. The discharge associated with different electrode types and the effects of dust contamination were therefore investigated. Variations in the current density were studied at the collector surface, using segmented electrodes, and in the interelectrode region, using a ballistic probe technique. The results were expected to have important implications on particle charging. Electrode performance was subsequently evaluated using the technique of laser-Doppler anemometry to measure particle velocities. Test dusts in two size ranges were used in order to separate the influence of aerodynamic and electrical forces. Mean particle charges were estimated from components of mean velocity due to the electrical force and measurement of the electric field. From the results of experiments using commercial electrodes, a development electrode has been constructed and preliminary evaluations performed.
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Published date: 1984
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Local EPrints ID: 460448
URI: http://eprints.soton.ac.uk/id/eprint/460448
PURE UUID: fd13deb8-1009-4bb2-8e96-a3a5190e047c
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Date deposited: 04 Jul 2022 18:22
Last modified: 04 Jul 2022 18:22
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Author:
Paul Francis Coventry
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