Characterization of ceramic composite membrane filters for hot gas cleaning

Novel composite ceramic membrane filters suitable for hot gas cleaning operations have been prepared from fly ash and titania particles on stainless steel woven mesh substrates. Both membranes had a structure like a solid packed bed with a thickness of less than 100 μm. In the domain of laminar flow...

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Bibliographic Details
Published in:Powder technology 1997-04, Vol.91 (1), p.55-62
Main Authors: Jo, Y.M., Hutchison, R.B., Raper, J.A.
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Ceramics
Exact sciences and technology
Filters
Gas cleaning
General processes of purification and dust removal
Membranes
Pollution
Prevention and purification methods
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Summary:Novel composite ceramic membrane filters suitable for hot gas cleaning operations have been prepared from fly ash and titania particles on stainless steel woven mesh substrates. Both membranes had a structure like a solid packed bed with a thickness of less than 100 μm. In the domain of laminar flow, significant differences in the pressure drop between experimental results and those predicted from the Kozeny-Carman relationship were found, particularly for flow through the titania membrane. Membrane filters with extremely small pores such as the titania membrane are greatly affected by slip up to 80% in permeability at elevated temperatures. Efficiencies of filtration of typical coal fired power station exhaust fly ashes were found to be greater than 909% for both titania and ash membranes, whilst there was greater variation in the pressure drops in the ash membrane than in the titania at typical gas flows.
ISSN:0032-5910
1873-328X
DOI:10.1016/S0032-5910(96)03246-9