WO2015160608A1 - Cartouche de filtration à haute température - Google Patents

Cartouche de filtration à haute température Download PDF

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Publication number
WO2015160608A1
WO2015160608A1 PCT/US2015/025041 US2015025041W WO2015160608A1 WO 2015160608 A1 WO2015160608 A1 WO 2015160608A1 US 2015025041 W US2015025041 W US 2015025041W WO 2015160608 A1 WO2015160608 A1 WO 2015160608A1
Authority
WO
WIPO (PCT)
Prior art keywords
filtration media
filter cartridge
silicon elastomer
end cap
open end
Prior art date
Application number
PCT/US2015/025041
Other languages
English (en)
Inventor
Kyle NANNENGA
Mark Belcher
Original Assignee
Donaldson Company, Inc.
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 Donaldson Company, Inc. filed Critical Donaldson Company, Inc.
Publication of WO2015160608A1 publication Critical patent/WO2015160608A1/fr

Links

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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B01D46/2414—End caps including additional functions or special forms
    • 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
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material

Definitions

  • the disclosure relates to filter elements and, in particular to pleated filter elements that filter particulate material from high temperature gas streams.
  • Gas streams often carry particulate material therein.
  • removal of some or all of the particulate material from a gas flow stream is needed.
  • production gases or off gases may contain particulate material, for example, those generated by processes that included mining, milling, chemical processing, sintering, painting, energy production, etc. Before such gases can be, or should be, directed through various downstream equipment and/or to the atmosphere, a substantial removal of particulate material from those streams is important.
  • Baghouses also known as dust collectors, for filtering particulate-laden air are well known.
  • Conventional baghouses have a large housing with an upper, clean air chamber and a lower, dirty air chamber.
  • the two chambers commonly referred to as plenums, are separated by a sheet of metal, commonly referred to as a tube sheet or cell plate.
  • the tube sheet has a number of openings therein from which cylindrical filters, such as bags or cartridges, are aligned.
  • the filters suspend downwardly from the tube sheet openings into the dirty air chamber. Particulate-laden air is introduced into the dirty air chamber, and the particulates collect onto the filters.
  • the filtered air passes through the filters to the interior of the filters, and upwardly out through the openings in the tube sheet into the clean air chamber. From the clean air chamber, the cleaned air is exhausted into the environment, or recirculated for other uses.
  • An objective in the design of a baghouse, and more particularly in the design of a filter bag or cartridge and its support structure, is that a seal exist between each filter element and the tube sheet. Otherwise, in the absence of a seal, particulate-laden air will seep around the filter element, through the tube sheet aperture, and into the clean air chamber, thereby contaminating the clean air. Additionally, because the filter elements require periodic replacement, it is important that the filter elements are easily removable and replaceable.
  • the disclosure relates to filter elements and, in particular to pleated filter elements that filter particulate material from gas streams.
  • the pleated filter elements can withstand high temperatures, such as up to 135 degrees centigrade or up to 150 degrees centigrade or greater.
  • a filter cartridge includes a length of filtration media that is circumferentially pleated.
  • the length of filtration media extends between a first open end and an opposing closed end.
  • An end cap formed of a silicon elastomer defines a gas outlet and is molded to the first open end.
  • a method of manufacturing a filter cartridge having a length of filtration media that is circumferentially pleated and defining a first open end fixed to a silicon elastomer end cap is described.
  • This method of manufacturing includes providing a mold defining a cavity for forming the end cap.
  • the end cap defines a gas outlet.
  • the method then includes forming the end cap onto the open end of the circumferentially pleated filtration media from the silicon elastomer within the cavity of the mold to form the filter cartridge and removing the end cap portion of the filter cartridge from the cavity of the mold.
  • a filter cartridge includes a length of filtration media that is circumferentially pleated and has aramid fibers or aromatic polyamide fibers.
  • the length of filtration media extends between a first open end and an opposing closed end.
  • An end cap is formed of a silicon elastomer and defining a gas outlet and is molded to the first open end. The first open end extends into the silicon elastomer of the end cap.
  • FIG. 1 is a schematic diagram of an illustrative dust collector
  • FIG. 2 is a schematic diagram of an illustrative filter cartridge
  • FIG. 3 is a schematic diagram view of the filter cartridge of FIG. 2 taken along lines 3-3;
  • FIG. 4 is a schematic diagram of an open end portion of the filter cartridge of FIG. 2.
  • the disclosure relates to filter elements and, in particular to pleated filter elements that filter particulate material from high temperature gas streams.
  • the pleated filter elements can withstand high temperatures, such as up to 125 degrees centigrade or 135 degrees centigrade or up to 150 degrees centigrade or greater.
  • An end cap formed of a silicon elastomer defines a gas outlet of the filter cartridge and is molded to the first open end.
  • the silicon elastomer end cap can be molded integrally with an end surface of the pleated filtration media and provide mechanical support for the pleated filtration media and assist in providing isolation between chambers in the dust collector. While the present disclosure is not so limited, an appreciation of various aspects of the disclosure will be gained through a discussion of the examples provided below.
  • a dust collector (also referred to as a baghouse, for example) is denoted generally by reference numeral 10.
  • Dust collector 10 is formed generally of a housing 12 separated into upper and lower chambers 14, 16 respectively, by a tube sheet 18.
  • the dust collector 10 has a collection hopper 19 at its bottom portion.
  • a plurality of filter elements 20 are suspended from tube sheet 18 into the lower chamber 16, and are held in place by attachment structure, denoted generally by reference numeral 22 in FIG. 1.
  • An inlet 24 communicates with lower chamber 16 and an outlet 26 communicates with upper chamber 14.
  • baghouse 10 The structure and operation of baghouse 10 will be readily appreciated by those with skill in the art. Described briefly, particulate-laden air is introduced into lower chamber 16 through inlet 24. The particulates collect onto filter elements 20, and the cleaned air exits out through the interior of the filters, upwardly through apertures in the tube sheet, and into the clean air chamber 14 where it is exhausted through outlet 26.
  • the filter elements 20 have a length that does not extend into the direct air flow from the inlet 24. This is useful when the air flow from the inlet 24 includes abrasive particles that can erode or damage the filter elements 20.
  • conventional planar filter cartridges having a standard length can be replaced with pleated filter cartridges having a length that is from about 50% to about 33% the length of the standard length while maintaining the same filtering area. This is useful in reducing the amount of abrasion or erosion caused by abrasive particles that is in the air flow from the inlet 24.
  • Pleated filter cartridges can have about 6 times or greater surface area as compared to non-pleated filter cartridges at the same length.
  • FIG. 2 is a schematic diagram of an illustrative filter cartridge 20.
  • FIG. 3 is a schematic diagram of the filter cartridge 20 of FIG. 2 taken along lines 3-3.
  • FIG. 4 is a schematic diagram of an open end portion 31 of the filter cartridge 20 of FIG. 2.
  • the filter cartridge 20 can have any useful cross-sectional shape.
  • the filter cartridge 20 can have an oval cross-sectional shape as illustrated in FIG. 3.
  • Oval shaped filter cartridges 20 have been found to provide better snap during cleaning as compared to filter cartridge having a round cross-sectional shape. This allows the particulates to be more easily removed or knocked off the filter cartridge 20 during pulse cleaning. In addition this allows for lower pressure drop and longer filter cartridge life.
  • the filter cartridge 20 includes a length of filtration media 30 that is circumferentially pleated.
  • the length of filtration media 30 extends between a first open end 31 and an opposing closed end 32.
  • An end cap 40 or end collar 40 is formed of a silicon elastomer and defines a gas outlet 42 and is molded to the first open end 31.
  • Preferably the entire end cap or end collar 40 is formed of the silicon elastomer described herein.
  • the closed end 32 can include a metal or rigid pan 38 sealed to the filtration media with a useful adhesive.
  • the closed end 32 can include a molded polymer rigid pan 38 that can be molded to the filtration media 30 and assist in maintaining the pleated structure of the pleated filtration media 30.
  • the molded polymer rigid pan 38 is formed of a similar material as the end cap or collar 40 material, such as a silicon elastomer, as described below.
  • the molded polymer rigid pan 38 can mechanically maintain the circumferentially pleated closed end 32.
  • the rigid pan 38 includes a metal pan disposed on a molded polymer rigid pan.
  • the silicon elastomer end cap or collar 40 material can directly bond to an exterior surface 36 of the filtration media 30.
  • the silicon elastomer end cap or collar 40 material can directly bond to an exterior surface 36 of the filtration media 30 and can directly bond to an interior surface 35 of the filtration media.
  • the silicon elastomer end cap or collar 40 material can extend into or through the filtration media 30.
  • the silicon elastomer end cap or collar 40 material can mechanically maintain the circumferentially pleated first open end 31.
  • the silicon elastomer end cap or collar 40 material can be any useful silicon elastomer material.
  • the silicon elastomer can withstand (is stable at) high temperatures, such as up to 135 degrees centigrade or up to 150 degrees centigrade or greater.
  • the silicon elastomer is a polydimethylsiloxane elastomer.
  • Useful polydimethylsiloxane elastomers are available under the trade designation SLYGARD silicone from Dow Corning (USA).
  • the silicon elastomer can be injection molded to form the end cap or collar 40 for the first open end 31 of the filter cartridge 20.
  • the end cap or collar 40 defines the gas outlet 42.
  • the end cap or collar 40 can completely encase the pleated first open end 31 and the exterior surface 36 and the interior surface 35 of the filtration media 30 can be embedded within the end cap or collar 40.
  • An illustrative method includes providing a mold defining a cavity for forming the end cap (the end cap defines a gas outlet of the filter cartridge) and placing the first open end of the circumferentially pleated filtration media in the mold. Then introducing silicon elastomer into the cavity of the mold and forming the end cap onto the open end of the circumferentially pleated filtration media from the silicon elastomer within the cavity of the mold to form the filter cartridge. Then the method includes removing the end cap portion of the filter cartridge from the cavity of the mold. The forming step flows the silicon elastomer into and through the filtration media. The forming step mechanically maintains the circumferentially pleated first open end, as described above.
  • the filtration media 30 can be formed of any useful filtration material.
  • the filtration media 30 can withstand (is stable at) high temperatures, such as up to 135 degrees centigrade or up to 150 degrees centigrade or greater.
  • the filtration media 30 can include aramid fibers or aromatic polyamide fibers. In many embodiments the filtration media 30 can include meta-aramid fibers.
  • the aramid fibers or aromatic polyamide fibers can extend into the silicon elastomer end cap.
  • Useful aramid fibers or aromatic polyamide fibers are available under the trade designations NOMAX or KEVLAR from DuPont (USA).
  • a rigid collar 50 can be attached to the silicon elastomer end cap 40
  • the rigid collar 50 can be fixed to the silicon elastomer end cap 40 by injection molding the silicon elastomer end cap 40 onto the rigid collar 50.
  • the rigid collar 50 can be any useful material such as metal.
  • Fasteners 52 such as bolts can fix the rigid collar 50 and filter element 20 to the tube sheet 18 of the dust collector 10.
  • a gasket 54 can be disposed between the end cap 40 and the tube sheet 18 to aid in sealing the upper chamber 14 from the lower chamber 16.
  • a gasket 54 can be placed about the silicon elastomer end cap 40 and assist in isolating the two chambers of the dust collector (shown in FIG. 1).
  • the gasket 54 can be any useful material can withstand (is stable at) high temperatures, such as up to 135 degrees centigrade or up to 150 degrees centigrade or greater.
  • the gasket material can be a different type of material than the material forming the end cap, such as silicone, for example.
  • the filter cartridge 20 can further include a screen or cage positioned within and supporting the pleated filtration media.
  • the screen or cage can be fixed to the silicon elastomer end cap 40 via molding the silicon elastomer end cap 40 to the screen or cage.
  • the screen or cage can be also fixed to the rigid pan 38 sealing the closed end 32 of the filter cartridge 20.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention concerne une cartouche de filtration comprenant une longueur de milieu de filtration qui est plissée sur la circonférence. La longueur de milieu de filtration s'étend entre une première extrémité ouverte et une extrémité fermée opposée. Un capuchon d'extrémité en élastomère de silicium définit une sortie de gaz et est moulé sur la première extrémité ouverte.
PCT/US2015/025041 2014-04-14 2015-04-09 Cartouche de filtration à haute température WO2015160608A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201461979138P 2014-04-14 2014-04-14
US61/979,138 2014-04-14

Publications (1)

Publication Number Publication Date
WO2015160608A1 true WO2015160608A1 (fr) 2015-10-22

Family

ID=52988503

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2015/025041 WO2015160608A1 (fr) 2014-04-14 2015-04-09 Cartouche de filtration à haute température

Country Status (1)

Country Link
WO (1) WO2015160608A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111076204A (zh) * 2019-12-31 2020-04-28 长沙如洋环保科技有限公司 一种云服务收集压缩式自动化灰尘处理系统
DE102021111390A1 (de) 2021-05-03 2022-11-03 Hengst Se Filterelement zur Heißgasfiltration
USD1032664S1 (en) 2022-04-14 2024-06-25 Caterpillar Inc. Filter housing and pipework for an engine
USD1032665S1 (en) 2022-04-14 2024-06-25 Caterpillar Inc. Filter housing and pipework for an engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5730766A (en) * 1996-11-05 1998-03-24 Bha Group, Inc. Non-round unitary filter cartridge
WO1999011355A1 (fr) * 1997-09-02 1999-03-11 Gore Enterprise Holdings, Inc. Materiaux filtrant plisse et filtres a cartouche composes de celui-ci
USRE37163E1 (en) * 1994-05-06 2001-05-08 Bha Group Holdings, Inc. Unitary filter cartridge
US20040237483A1 (en) * 2003-05-30 2004-12-02 Bha Group Holdings Inc. Filter cartridge mounting structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE37163E1 (en) * 1994-05-06 2001-05-08 Bha Group Holdings, Inc. Unitary filter cartridge
US5730766A (en) * 1996-11-05 1998-03-24 Bha Group, Inc. Non-round unitary filter cartridge
WO1999011355A1 (fr) * 1997-09-02 1999-03-11 Gore Enterprise Holdings, Inc. Materiaux filtrant plisse et filtres a cartouche composes de celui-ci
US20040237483A1 (en) * 2003-05-30 2004-12-02 Bha Group Holdings Inc. Filter cartridge mounting structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111076204A (zh) * 2019-12-31 2020-04-28 长沙如洋环保科技有限公司 一种云服务收集压缩式自动化灰尘处理系统
DE102021111390A1 (de) 2021-05-03 2022-11-03 Hengst Se Filterelement zur Heißgasfiltration
WO2022233569A1 (fr) 2021-05-03 2022-11-10 Hengst Se Élément filtrant pour filtration de gaz chaud
USD1032664S1 (en) 2022-04-14 2024-06-25 Caterpillar Inc. Filter housing and pipework for an engine
USD1032665S1 (en) 2022-04-14 2024-06-25 Caterpillar Inc. Filter housing and pipework for an engine

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