Turbine air-intake filter

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 39/16 (2006.01) B01D 46/12 (2006.01) B01D 46/52 (2006.01)

Patent

CA 2592417

A turbine air-intake filter for removal of particles from an air stream entering a gas turbine comprises a composite filter media (10) being made from a membrane filtration layer (20) comprising a porous polymeric membrane, such as porous polytetrafluoroethylene (ePTFE), and at least one depth filtra~tion media layer (18) comprising fibers, such as a melt blown web, and being disposed on an upstream side of the membrane filtration layer (20) relative to a direction of gas flow through the filter. The fibers of the depth filtration media layer (18) have an electrostatic charge. The ePTFE membrane is pref~erably made from a blend of a PTFE homopolymer and a modified PTFE polymer.

Le filtre d'admission d~air de turbine selon l~invention, destiné à éliminer des particules d'un flux d'air entrant dans une turbine à gaz, comprend un support de filtre composite (10) fabriqué à partir d'une couche de filtration sur membrane (20) comprenant une membrane polymère poreuse, par exemple du polytétrafluoroéthylène poreux (ePTFE), et au moins une couche de support de filtration en profondeur (18) comprenant des fibres, telle qu'une toile obtenue par fusion-soufflage, et disposé sur un côté en amont de la couche de filtration sur membrane (20) par rapport au sens de passage du gaz dans le filtre. Les fibres de la couche de support de filtration en profondeur (18) ont une charge électrostatique. La membrane en ePTFE est de préférence fabriquée à partir d'un mélange d'un homopolymère de PTFE et d'un polymère de PTFE modifié.

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