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Interaction of water droplets with soluble filter cakes in gas cleaning applications

Schwarz, Almuth D.; Meyer, Jörg; Dittler, Achim

Abstract (englisch):
In surface filtration processes, particles are collected on the upstream face side of the filter and form a filter cake. In commonly studied processes for the removal of particles from dust-laden gas streams, this cake remains on the filter surface until it is removed from the filter for example by pulse-jet cleaning. However, soluble particles are present in our ambient air as well as a common component of aerosols in various gas cleaning processes. When soluble particles are present in the filter cake and are exposed to fine water droplets throughout the process, the soluble particles dissolve. This can lead to a restructuring of the filter cake and the penetration of particles into the filter medium. This behavior in gas cleaning systems and its possible influence on the structure of the cake and pressure drop across the filter has not yet been systematically investigated.

The experiments presented in this work show how soluble filter cakes restructure on hydrophobic glass fiber media after being exposed to water droplets at a filtration velocity of 3.5 cm s−1. Sodium chloride, potassium chloride and potassium sulfate particulate matter is separated from a dry air stream and subsequently exposed to different amounts of water droplets or a relative humidity above 85% with no liquid droplets present. ... mehr

DOI: 10.1016/j.seppur.2020.118128
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1383-5866
KITopen-ID: 1000127283
Erschienen in Separation and purification technology
Verlag Elsevier
Seiten Article no: 118128
Vorab online veröffentlicht am 30.11.2020
Schlagwörter Gas cleaning Soluble particles Operating behavior Surface filtration Water droplets
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