WO2015002890A1 - Procédé d'assemblage de filtres à manches constitués d'au moins deux couches - Google Patents

Procédé d'assemblage de filtres à manches constitués d'au moins deux couches Download PDF

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Publication number
WO2015002890A1
WO2015002890A1 PCT/US2014/044914 US2014044914W WO2015002890A1 WO 2015002890 A1 WO2015002890 A1 WO 2015002890A1 US 2014044914 W US2014044914 W US 2014044914W WO 2015002890 A1 WO2015002890 A1 WO 2015002890A1
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WO
WIPO (PCT)
Prior art keywords
layer
particulates
filter
layers
filter assembly
Prior art date
Application number
PCT/US2014/044914
Other languages
English (en)
Inventor
Stephen David HINER
Etienne René JARRIER
Original Assignee
Bha Altair, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bha Altair, Llc filed Critical Bha Altair, Llc
Publication of WO2015002890A1 publication Critical patent/WO2015002890A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame

Definitions

  • the invention relates generally to a filter media and, more particularly, to a filter media having an improved filtration efficiency.
  • Filter assemblies may be used to provide clean fluid, such as air, to or from various devices. Such devices may include gas turbines.
  • Filter elements may include a filter bag structure. As fluid passes through the filter bags, dust and other particles are captured on the surfaces of the media of the filter bags. The airflow rate through filter bags can be higher than desired. The filter bags can also have a higher differential pressure loss than desired. Higher airflow rates and higher differential pressure loss for the filter can result in entrapment of less dust or particulates resulting in shorter filter lives as well as reduced filtration efficiency. Further problems occur when the filter assemblies are filtering fluid that is in a marine or other environment that causes large amounts of liquids to be carried in the fluid to be filtered. There are benefits for continual improvements in filter technologies so as to address these and other issues.
  • a new and improved filter assembly includes a filter pocketing having one or more sidewalls formed from one or more first layers configured to filter first particulates and one or more second configured to filter second particulates.
  • the sidewalls include one or more third layers configured to support the first layer and the second layer.
  • the first layer is positioned on one side of the second layer and the third layer is positioned on an opposing side of the second layer. [0006] In one embodiment, the first layer is rated to a filtration efficiency of about Gl to about G4 to EN779-2012.
  • the second layer is rated to a filtration efficiency of about M5 to about F9 to EN779-2012.
  • the second layer is arranged in a wave configuration.
  • the first layer is upstream from the second layer such that the fluid passes through the first layer first.
  • the second layer is an outer layer positioned outward from the first layer, and typically, downstream from the first layer.
  • the first layer is upstream from the second layer.
  • the first layer is configured to remove first particulates that are larger than the second particulates filtered by the second layer.
  • the third layer is an open layer.
  • the first particulates include a liquid.
  • the wave configuration of the second layer provides a greater surface area for the second layer than the surface area of the first layer.
  • the third layer is upstream of the second layer.
  • the second layer includes a coarse support layer that is arranged into the wave configuration.
  • a method of filtering a fluid with a filter assembly includes providing a filter pocket having one or more sidewalls, the sidewalls including one or more first layers and one or more second layers; filtering first particulates with the first layers, the first particulates including a liquid; and filtering second particulates with the second layers, the second particulates being finer than the first particulates.
  • the first layer is positioned upstream of the second layer such that filter first particulates with the first layer occurs prior to filtering second particulates with the second layer.
  • the second layer is arranged in a wave configuration such that the second layer has a greater surface area than the first layer.
  • the second particulates include particulates selected from the group consisting of sand and salt.
  • the method includes supporting the first and second layers with a third layer.
  • the third layer is downstream from the first and second layers.
  • FIG. 1 is a schematized cross-section view of an example filter assembly including an example filter pocket in accordance with an aspect of the prevent invention
  • FIG. 2 is a sectional view of a sidewall of the filter pocket in accordance with an aspect of the present invention
  • FIG. 3 is a sectional view of the sidewall in which a fluid flows through the sidewall
  • FIG. 4 is a graphical illustration of a prior filter assembly without a first layer
  • FIG. 5 is a graphical illustration of the example filter assembly including a first layer and a second layer.
  • Example embodiments that incorporate one or more aspects of the present invention are described and illustrated in the drawings. These illustrated examples are not intended to be a limitation on the present invention. For example, one or more aspects of the present invention can be utilized in other embodiments and even other types of devices. Moreover, certain terminology is used herein for convenience only and is not to be taken as a limitation on the present invention. Still further, in the drawings, the same reference numerals are employed for designating the same elements.
  • FIG. 1 illustrates an example filter assembly 10, according to some embodiments.
  • the filter assembly 10 can be used for filtering air in a variety of environments.
  • the filter assembly 10 can be used to filter air in an offshore environment.
  • the offshore environments include maritime environments that are subject to rain, water, fog, sand, dust, etc.
  • the filter assembly 10 is not limited to these environments.
  • the filter assembly 10 may be used in an inlet system for filtering air to a device, such as a gas turbine, filtration system, etc.
  • the filter assembly 10 includes at least one filter pocket 12.
  • the at least one filter pocket 20 of the filter assembly 10 includes an open end 14 and a closed end 16.
  • Fluid 18 (e.g., air flow, etc.) flows through the filter assembly 10 generally along a flow direction 20 and is filtered.
  • the fluid 18 is received at the open end 14 and proceeds along the flow direction 20 toward the closed end 16.
  • the fluid 18 can be liquid, air, or gas supplied to a filtration system, for example.
  • the filter assembly 10 can include any number of filter pockets 12.
  • the filter assembly 10 of FIG. 1 is illustrated as including four filter pockets 12.
  • the filter assembly 10 is not limited to four filter pockets, and, instead, may include one or more filter pockets 12.
  • the four filter pockets 12 can be generally identical in structure, size, shape, etc. As such, most of the description herein is focused upon one of the filter pockets 12, with an understanding that similar structures and functions are present for the other three filter pockets 12. In some examples, it is contemplated that the four filter pockets 12 may have some differences. As such, it is to be understood that examples with differing filter pockets are still within the scope of the present invention, and that the present example is not an indication of the complete scope of the filter assembly 10.
  • the example filter assembly 10 of FIG. 1 can be used in a filter house with a plurality of filters for filtering particles (e.g., dust) and other particulate materials from a gaseous, fluid exhaust such as a combustion system of a gas turbine.
  • the filter house can support a plurality of filter pocket assemblies.
  • the example filter assembly 10 can also be used as a pre-filter or as a final filter.
  • the type of dust/particulate matter/etc. that is filtered may be varied and is not a limitation upon the present invention.
  • the filter assembly 10 can include a frame 22.
  • the frame 22 can have a variety of shapes and configurations.
  • the frame 22 can be formed from any number of members and can form any shape, including, but not limited to, the quadrilateral shape shown in FIG. 1.
  • the frame 22 can be configured to receive any number of filter pockets, including a single filter pocket.
  • Each open end 14 of the filter pocket 12 is configured or shaped to fit the area bounded by the members of the frame 22.
  • the members of the frame 22 receive an outer portion of the filter pocket(s) 12. It is to be appreciated that the members of the frame 22 can be
  • the filter pockets 12 can include a plurality of sidewalls 24 formed of a filter material.
  • the filter material can include any number of materials and can be formed by a variety of processes. Of course, one or more aspects of the filter material, such as material, construction, configuration, thickness, etc. can be varied. Such specifics are not limitations upon the scope of the present invention.
  • the fluid 18 is filtered by the filter material as it passes through the at least one sidewall 24.
  • FIG. 2 an example of one of the sidewalls 24 of a filter pocket 12 is illustrated.
  • the sidewall 24 of FIG. 2 is illustrated in a partially exploded/detached state for illustrative purposes (e.g., layers 40, 50, and 60 are separated from each other).
  • the various layers 40, 50, and 60 forming the sidewall 24 can be attached to each other, such as, but not limited to, fasteners (e.g., sewing, adhesives, mechanical fasteners, etc.).
  • the sidewall 24 can separate an inlet side 30 and an outlet side 32.
  • the fluid 18 can flow along the flow direction 20 from the inlet side 30 to the outlet side 32.
  • the sidewall 24 includes one or more first layers 40.
  • the first layer 40 can be positioned to separate the inlet side 30 from an opposing second side 42.
  • the first layer 40 includes any number of materials that can filter the fluid 18.
  • the first layer 40 includes a filter media.
  • the first layer 40 can include, for example,
  • the first layer 40 is rated to a filtration efficiency of about Gl to about G4 to EN779-2012.
  • the first layer 40 can filter and drain, for example, liquid (e.g., water droplets, etc.), relatively larger particulates, etc., while smaller/finer particulates can pass through the first layer 40.
  • the first layer 40 includes any number of thicknesses. In some examples, the first layer 40 includes a thickness of about 4 millimeters (mm) to about 30 mm.
  • the sidewall 24 can include one or more second layers 50.
  • the fluid 18 can flow along the flow direction 20 from the second side 42 to an opposing third side 52.
  • the fluid 18 can flow through the second layer 50 from the second side 42 to the third side 52, which causes the fluid 18 to be filtered.
  • the second layer 50 includes any number of materials that can filter the fluid 18.
  • the second layer 50 is held in a waved or curvilinear configuration (illustrated generically/schematically with wave pattern). By including the waved/curvilinear configuration, the second layer 50 has an increased surface area which can result in improved filtration efficiency or reduced pressure loss.
  • the second layer 50 can include one or more coarse support layers, one or more fine fiber filtration layers, one or more membrane layers, etc.
  • the one or more coarse support layers, fine fiber filtration layers, membrane layers, etc. are arranged/constructed into the wave pattern, such that filtration efficiency is improved.
  • the second layer 50 can include any number of materials.
  • the second layer 50 includes polyolefms, such as polypropylene and polyethylene; polyesters, such as polybutylene terephthalate and polyethylene terephthalate; polyamides, such as Nylon; polycarbonate; polyphenylene sulfide; polystyrene; polyurethane; glass fibers, etc.
  • the second layer 50 can include, alone or in combination,
  • polytetrafluoroethylene e.g., expanded or unexpanded
  • polyethylene e.g., linear low density, ultra high molecular weight
  • polypropylene polycarbonate
  • polyester nitrocellulose- mixed esters
  • polyethersulfone cellulose acetate, polyimide, cellulose acetate, polyvinylidene fluoride, polyacrylonitrile, polysulfone, polyethersulfone, and polyamide, amongst others.
  • the second layer 50 is rated to a filtration efficiency of about M5 to about F9 to EN779-2012.
  • the second layer 50 can filter, for example, relatively finer particulates.
  • the first layer 40 will filter the larger particulates, including liquids (e.g., water droplets, etc.), while the smaller/finer particulates that pass through the first layer 40 are filtered by the second layer 50.
  • the second layer 50 can include any number of thicknesses. In some examples, the second layer 50 includes a thickness of about 3 mm to about 20 mm.
  • the sidewall 24 can include one or more third layers 60.
  • the fluid 18 can flow along the flow direction 20 from the third side 52 to the outlet side 32 on an opposing side of the third layer 60.
  • the third layer 60 can include a support material, such that the third layer 60 can function as a support layer.
  • the third layer 60 can support the first layer 40 and second layer 50.
  • the filter assembly 10 is not limited to including the third layer 60, as the third layer 60 is optional and may not be provided in some examples.
  • the third layer 60 includes any number of support materials, including metals, polyesters, etc., and can be constructed as a mesh, scrim, or the like. In some examples, a thickness of the third layer 60 can vary from about 0.1 mm to about 5 mm.
  • the third layer 60 can be generally open, so as to reduce pressure loss of the fluid 18 flowing through the third layer 60.
  • the third layer 60 is not limited to the illustrated position (e.g., adjacent the second layer 50 on an opposite side of the first layer 40). Rather, in other examples, the third layer 60 can be positioned at the inlet side 30, between the first layer 40 and second layer 50, or the like.
  • the first layer 40 can filter out first particulates 100 (illustrated generically/schematically with arrowheads).
  • the first particulates 100 include relatively larger particulates, including liquids or water droplets, for example.
  • the first particulates 100 are generally limited and/or prevented from passing through the first layer 40 from the inlet side 30 to the second side 42. Rather, the first particulates 100 can remain on a surface (and/or coalesced through a depth of the media) of the first layer 40.
  • the liquid when the first particulates 100 include liquid or water droplets, the liquid can accumulate on the surface (and/or coalesced through a depth of the media) of the first layer 40.
  • the liquid coalesces so as to increase in size/weight on the surface (and/or through a depth of the media) of the first layer 40.
  • the liquid e.g., first particulates 100
  • the first particulates 100 are generally limited from accumulating on the surface (and/or through a depth of the media) of the first layer 40, thus limiting pressure loss of fluid 18 flowing through the first layer 40.
  • the second layer 50 can filter out second particulates 102 (illustrated
  • the second particulates 102 include relatively finer particulates that have passed through the first layer 40.
  • the second particulates 102 can include airborne particulates such as salt, sand, dust, etc.
  • the second layer 50 Due to the second layer 50 comprising the wave media (e.g., waved/curvilinear configuration), the second layer 50 has an increased surface area to improve filtration efficiency or reduce pressure loss.
  • the second layer 50 can limit and/or prevent the second particulates 102 from passing through the second layer 50 from the second side 42 to the third side 52. Rather, the second particulates 102 can remain on a surface of the second layer 50.
  • the second particulates 102 can fall from the second layer 50, as illustrated. Accordingly, the second particulates 102 can be generally limited from accumulating on the surface of the second layer 50, thus limiting pressure loss of fluid 18 flowing through the second layer 50.
  • Filtered air flow 104 can pass through the second layer 50 from the second side 42 to the third side 52.
  • the air flow 104 is filtered as it passes through the first layer 40.
  • the first particulates 100 are filtered from the air flow 104 as the air flow 104 passes through the first layer 40.
  • the second particulates 102 are filtered from the air flow 104 as the air flow 104 passes through the second layer 50.
  • the air flow 104 exiting the second layer 50 comprises filtered air flow 104.
  • This filtered air flow 104 can pass through the third layer 60 and exit the sidewall 24.
  • the filter assembly 10 includes a number of benefits.
  • the first layer 40 and second layer 50 can selectively filter different particulates (e.g., the first particulates 100 and second particulates 102).
  • the first layer 40 can filter out the first particulates 100, including liquids, water droplets, dust, etc. These first particulates 100 can coalesce and/or merge, thus allowing the first particulates 100 to be drained from or fall from the first layer 40. Since the first particulates 100 tend to not accumulate on the first layer 40, pressure loss/drop of fluid 18 passing through the first layer 40 is reduced.
  • the second particulates 102 which are relatively finer/smaller than the first particulates 100, can then be filtered by the second layer 50.
  • FIG. 4 a graphical illustration of a prior filter assembly is illustrated.
  • the prior filter assembly included the second layer, but not the first layer.
  • the graphical illustration of FIG. 4 plots pressure loss (in Pascal) along the y-axis against time (in hours) along the x-axis.
  • pressure loss for this prior filter assembly exceeds 1000 Pascal in some situations.
  • FIG. 5 a graphical illustration of the example filter assembly 10 described with respect to FIGS. 1 to 3 is shown.
  • the filter assembly 10 includes the first layer 40, second layer 50, and third layer 60.
  • the graphical illustration of FIG. 5 plots pressure loss (in Pascal) along the y-axis against time (in hours) along the x-axis.
  • the filter assembly 10 exhibits a negligible fluctuation in pressure loss when challenged with water droplets for air flowing through the filter assembly 10 over time.
  • the pressure loss of the air remained below 400 Pascal during the entire two hour testing period.
  • pressure loss through the filter assembly 10 is reduced due, at least in part, to the first particulates 100 coalescing and falling from the filter assembly (e.g., not accumulating on the outer surface).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention concerne un ensemble filtre comprenant une poche filtrante comportant une ou plusieurs parois latérales destinées à filtrer un fluide. Lesdites parois latérales comportent une ou plusieurs premières couches destinées à filtrer des premières particules présentes dans un liquide. Les parois latérales comportent également une ou plusieurs secondes couches destinées à filtrer des secondes particules qui sont plus fines que les premières.
PCT/US2014/044914 2013-07-01 2014-06-30 Procédé d'assemblage de filtres à manches constitués d'au moins deux couches WO2015002890A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361841439P 2013-07-01 2013-07-01
US61/841,439 2013-07-01

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WO2015002890A1 true WO2015002890A1 (fr) 2015-01-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108188121A (zh) * 2018-01-25 2018-06-22 武汉纺织大学 一种耐高温滤袋的双排双喷清洗装置
US11666851B2 (en) 2015-08-03 2023-06-06 Parker-Hannifin Corporation Filter with preferential air flow

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225328A (en) * 1977-11-17 1980-09-30 Delbag-Luftfilter Gmbh Exchangeable filter element
US5667544A (en) * 1996-04-29 1997-09-16 Aaf International Extended life filter apparatus
US5800585A (en) * 1997-04-03 1998-09-01 Choi; Kyung-Ju Self-supporting pocket fluid filter
US6010548A (en) * 1998-01-30 2000-01-04 Freudenberg Nonwovens Limited Partnership Spaced pocket filter assembly and method of manufacturing same
WO2009018444A1 (fr) * 2007-07-31 2009-02-05 Aaf-Mcquay Inc. Procédé de fabrication d'un filtre de turbine à gaz marin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225328A (en) * 1977-11-17 1980-09-30 Delbag-Luftfilter Gmbh Exchangeable filter element
US5667544A (en) * 1996-04-29 1997-09-16 Aaf International Extended life filter apparatus
US5800585A (en) * 1997-04-03 1998-09-01 Choi; Kyung-Ju Self-supporting pocket fluid filter
US6010548A (en) * 1998-01-30 2000-01-04 Freudenberg Nonwovens Limited Partnership Spaced pocket filter assembly and method of manufacturing same
WO2009018444A1 (fr) * 2007-07-31 2009-02-05 Aaf-Mcquay Inc. Procédé de fabrication d'un filtre de turbine à gaz marin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11666851B2 (en) 2015-08-03 2023-06-06 Parker-Hannifin Corporation Filter with preferential air flow
CN108188121A (zh) * 2018-01-25 2018-06-22 武汉纺织大学 一种耐高温滤袋的双排双喷清洗装置

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