The Development and Testing of a Small Scale Dry Electrostatic Precipitator for the Removal of Particulate Matter
This paper presents a small tube/wire type electrostatic precipitator (ESP). In the ESPs present form, particle charging and collecting voltages and airflow rates were individually varied throughout 200 ambient temperature test runs ranging from 10 to 30 kV in increments on 5 kV and 0.5 m/s to 1.5 m/s, respectively. It was repeatedly observed that, at input air velocities of between 0.5 and 0.9 m/s and voltage settings of 20 kV to 30 kV, the collection efficiency remained above 95%. The outcomes of preliminary tests at combustion flue temperatures are, at present, inconclusive although indications are that there is little or no drop in comparable performance during ideal test conditions. A limited set of similar tests was carried out during which the collecting electrode was grounded, having been disconnected from the static generator. The collecting efficiency fell significantly, and for that reason, this approach was not pursued further. The collecting efficiencies during ambient temperature tests were determined by mass balance between incoming and outgoing dry PM. The efficiencies of combustion temperature runs are determined by analysing the difference in opacity of the flue gas at inlet and outlet compared to a reference light source. In addition, an array of Leit tabs (carbon coated, electrically conductive adhesive discs) was placed at inlet and outlet for a number of four-day continuous ambient temperature runs. Analysis of the discs’ contamination was carried out using scanning electron microscopy and ImageJ computer software that confirmed collection efficiencies of over 99% which gave unequivocal support to all the previous tests. The average efficiency for these runs was 99.409%. Emissions collected from a woody biomass combustion unit, classified to a diameter of 100 µm, were used in all ambient temperature trials test runs apart from two which collected airborne dust from within the laboratory. Sawdust and wood pellets were chosen for laboratory and field combustion trials. Video recordings were made of three ambient temperature test runs in which the smoke from a wood smoke generator was drawn through the precipitator. Although these runs were visual indicators only, with no objective other than to display, they provided a strong argument for the device’s claimed efficiency, as no emissions were visible at exit when energised. The theoretical performance of ESPs, when applied to the geometry and configuration of the tested model, was compared to the actual performance and was shown to be in good agreement with it.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1129061Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 756
 Birkett Simon. Clean Air London. Health and Environment Committee air quality work programme (February 2013).
 Theodore Louis. Air Pollution Control Equipment Calculations. ISBN: 978-0-470-20967-7 (Aug 2008).
 World Health Organisation. WHO guidelines for indoor air quality’ (Selected Pollutants) (2010).
 Clean Air in London. Indoor air quality can be worse than outdoor (19 September 2012.
 Conference on the future of EU air policies in Europe BRUSSELS (8 January 2012).
 BS EN 779. Particulate air filters for general ventilation. Determination of the filtration performance (April 2012).
 Simon Birkett. Transport for London’s ‘Head Office Portfolio’. Section title: Challenges Posted on (11 February 2013).
 Wurzler Sabine, Tamir G. Reisin, Zev Levin. Journal of Geophysical Research. Volume 105. Modification of mineral dust particles by cloud processing and subsequent on drop size distribution (2000).
 Parker K. Electrical Operation of Electrostatic Precipitators. Published by Institution of engineering and Technology ISBN: 978-0-85296-137-7 (2003).
 Parker K.R. Applied Electrostatic Precipitation. Chapter on: Milestones in the History of Precipitation Print ISBN 978-94-010-7193-2 (1997).
 Pettersson J and Strand M. Cost efficient precipitation of sub-micron particles in flue gases formed by the combustion of solid biofuel. 18th European Biomass Conference and Exhibition, Lyon France (3-7 May 2010).
 Xiangrong Zhang, Lianze Wang, Keqin Zhu. Particle tracking and particle-wall collision in a wire-plate electrostatic precipitator. Journal of Electrostatics 63 pp 1057-1071 (2005).
 Packer Neil. Lecture notes. Staffordshire University (2015).
 Jonassen Niels. Electrostatics. Second edition. 3.4 charging of gases. Page 39 ISBN: 1-4020-7161-2 (2002).
 Survey of the present state of particle precipitation devices for residential biomass combustion. Graz University of Technology, Austria. IEA Bioenergy Task 32 (2011).
 Air Quality Expert Group (AQEG) ref PB13837. Fine Particulate Matter (PM2.5) in the United Kingdom. Prepared for: Department for Environment, Food and Rural Affairs (2013).