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Title: The behaviour of electrically active and prefilter fibrous filters under solid aerosol load
Author: Walsh, Declan Christopher
ISNI:       0000 0001 3557 7350
Awarding Body: Loughborough University of Technology
Current Institution: Loughborough University
Date of Award: 1995
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Fibrous filter materials are used to remove fine aerosol particles from gases at as low a pressure drop as possible, while achieving the desired quality of cleaned gas. High aerosol removal efficiency at low pressure drop can be achieved if the filter fibres carry an electric charge, allowing aerosol to be collected by additional electrostatic mechanisms. Unfortunately the efficiency of such materials is reduced as they are loaded with aerosol. Prefilter materials can also achieve very high efficiencies, but at the expense of greater pressure drop, and filter cakes, which have very high pressure drops, form on such materials at low aerosol particle loads. Producing a fibrous filter from both types of material, a composite, allows efficient aerosol collection at low pressure drop, and high dust holding capacity. This work reports on an experimental program studying the aerosol particle penetration through, and pressure drop across a mixed fibre type electrically active material, and a number of prefilter materials of differing packing density, as they are loaded with aerosol particles. The effects of aerosol particle size, aerosol particle charge, aerosol composition, filter face velocity, filter fibre charge, and relative humidity have been studied. A theoretical analysis of this work is discussed, and a methodology for composite filter design presented.
Supervisor: Not available Sponsor: Health and Safety Executive
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: Chemical Engineering not elsewhere classified