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WO1992016280A1 - Septum a precouches dote d'une structure de retention de milieu filtrant particulaire solidaire - Google Patents

Septum a precouches dote d'une structure de retention de milieu filtrant particulaire solidaire Download PDF

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Publication number
WO1992016280A1
WO1992016280A1 PCT/US1992/001976 US9201976W WO9216280A1 WO 1992016280 A1 WO1992016280 A1 WO 1992016280A1 US 9201976 W US9201976 W US 9201976W WO 9216280 A1 WO9216280 A1 WO 9216280A1
Authority
WO
WIPO (PCT)
Prior art keywords
septum
filter medium
particulate filter
precoat
yarn
Prior art date
Application number
PCT/US1992/001976
Other languages
English (en)
Inventor
Steven D. Barboza
Original Assignee
Memtec America Corporation
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 Memtec America Corporation filed Critical Memtec America Corporation
Publication of WO1992016280A1 publication Critical patent/WO1992016280A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B01D29/216—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets with wound sheets

Definitions

  • the present invention relates to filtration syste based on solid particulate filtration media, particularl ion-exchange particulate filter media and the lik supported on a septum.
  • Such filtration systems often known as "precoat filters” are widely used in a variety of applications, one of the most demanding of which is in the filtration of boiler water steams of nuclear powered stea electrical generating operations, i.e., in the condenser stage of nuclear power plants.
  • septum offering performance superior to prior septa is disclosed and claimed in applicant's related and co-pending application, Serial No. 07/395,512, filed August 18, 1989, the disclosure of which is hereby incorporated by reference herein.
  • the septum defined therein is a preferred structure in the context of the present invention, which relates to an improvement 5 thereon, although it should be noted that the improvement disclosed in the present invention may be adapted to use with other septa, albeit without the particular advantages of the preferred septum of the related application.
  • the septum is 10 employed as a plurality of cylindrical or tubular cartridge elements deployed in a pressure vessel.
  • the particulate filter medium system is introduced into the vessel in a liquid carried and is deposited on the outer surfaces of the septum and is retained there by the liquid 15 flow, which passes through the particulate filter medium, through the septum, into a flow channel inside the tube and thence out of the filtration pressure vessel.
  • the particulate filter medium on the surface of the septum is often exposed to substantial turbulence in the liquid flow stream.
  • the turbulence may 30 be localized in certain parts of the system or may be a general condition affecting all or substantially all the particulate material, depending on the design and operating characteristics of the pressure vessel. Turbulent flow conditions can often pose problems of
  • a septum is provided with an integral spiral winding of yarn in an open diamond winding pattern which overlays the normal septum base structure, having a thickness which approximates the desired thickness of the particulate filter medium precoat.
  • the overlay may be applied to the entire length of the septum or only to those locations exposed to high turbulence.
  • the open pattern of the overlay is sized to permit the particulate filter medium to rather freely penetrate the depth of the overlay portion of the septum to the base layer, and to fill the open interstices to the surface of the overlay, and beyond if desired, and to freely pass out of the overlay when the direction of flow is reversed during backwash operations.
  • the septum base layer be a closed spiral wound yarn pattern, and particularly preferred that it be formed in accordance with the teachings of our related co-pending application Serial No. 07/395,512.
  • Other types of structures may be employed in the base layer, but generally lack the advantages of the most preferred construction.
  • FIG. 1 shows an exploded view, in perspective of a septum core assembly with end caps.
  • Fig. 2 shows a perspective view of the precoat septum with its integral resin retainer, wound on a septum core assembly of Fig. 1.
  • the filter medium an ion exchange resin, a solid absorbant material, or a mixture of both, applied in a layer of suitable depth on a septum.
  • ion exchange resin a solid absorbant material
  • a mixture of both applied in a layer of suitable depth on a septum.
  • a variety of such materials are well known and commonly employed, and are selected in accordance with the dictates of the particular demands of the filtration to be achieved.
  • the filtration is most often conducted in a suitably sized vessel, containing an inlet, an outlet, means to dispose a plurality of septa within the vessel, a particulate filter medium applied as a coating on the septa, and means to assure that fluid to be filtered must pass the filter medium and the septa in order to pass from inlet to outlet.
  • the interior volume of the vessel is divided by a header plate adapted to sealably receive and engage one end of the septa elements, so that fluid passing into the vessel passes through the filter medium, the septa, and then into an outlet manifold which carries the filtrate out of the vessel.
  • septum and septa are employed to designate a barrier support layer, designed to receive and hold an applied coating of a layer of a solid particulate filter medium, to provide a barrier to the flow of the filter medium and its entrained debris our of the filtration vessel with the filtrate, and to permit effective cleaning and removal o the fouled filter medium from the filter vessel b backwashing operations.
  • a septum does not itself perfor any filtration functionality during the filtratio operation, and desirably imposes the minimum possibl hydraulic flow resistance to the filtrate.
  • the structure of the individual septa elements ar generally in the form of a hollow, tubular form, at leas one open end adapted to engage a receiver in the tub sheet (or header plate, as it is sometimes called) of th filter vessel.
  • the present invention is applicable t septa formed with two open ends or with one open and on closed; both forms are common in the art.
  • the septu element itself is a porous material, formed int cylindrical configuration, supported as necessary b structural reinforcing elements such as a tubula perforate hollow core, or self supporting, and engaging a one end the closed end cap structure and at the other end the open end cap structure appropriate to engage th receiver.
  • the septum structure may be formed of metalli or polymeric materials, and may be a perforated shee material, a woven or non-woven fibrous fabric, or a spira wound yarn configuration.
  • Sheet materials and fabri materials may be employed in wrapped or pleated form familiar to the art, and may be reinforced by a variety o support materials.
  • Spiral wound yarns are normall applied to a tubular core element which serves as th winding form and as structural support for the septum i use.
  • spiral wound yarn septa ar preferred, for their ease and economy of manufacture, th ready reproducibility of characteristics, and their lon service life in demanding circumstances.
  • septa 07/395,512, filed August 18, 1989, based on septa forme by spiral winding of air-jet bulked continuou multifilament yarns. All septa are exposed in use to turbulent flow conditions over at least certain areas of their surface during filtration operations and are to at least some degree susceptible to erosion and scouring of the particulate filter medium from the septum surface in such areas.
  • an integral particulate filter medium retainer is employed in areas subjected to turbulence which operates to retain an acceptable coating of the particulate filter medium in place on the septum, so that incident turbulent flow is not able to remove the filter medium to a meaningful extent from the region of turbulent flow protected by the particulate filter medium retainer. In operation, the need for turbulence damping elements is eliminated.
  • the particulate filter medium retainer of the present invention is an integral spiral winding of a suitable yarn applied in an open pattern on the surface of the septum subject to high turbulence in use, or the substantial equivalent.
  • the winding is applied in a thickness which approximates the intended thickness of the particulate filter medium coating to be applied, and the open pattern effectively serves to form a segmented series of "pockets" or open apertures in the winding of the particulate filter me ⁇ iurr. retainer adapted to receive the particulate filter medium when applied.
  • the applied coating fills ope pockets to the required depth for filtration, down to th septum surface, and since the yarn winding prevent turbulence from scouring or eroding at least the majorit of the depth of the coating away from such surfaces, filtration efficiency is sustained over the entire area o the septum.
  • the particulate filter mediu retainer be applied to the septum only in those areas o the surface subject to high levels of applied turbulenc during filtration operations.
  • the particulate filte medium retainer may be applied to the entire septum i desired, but will show some undesirable features which ar better minimized if possible.
  • the particulate filte medium retainer will increase the pressure drop across th septum to a degree, for example, both during filtratio and during backwash operations, so that it is generall desirable to minimize the area of coverage to include tha necessary for effective performance, i.e. areas of hig incident turbulence.
  • any thickness of the particulate filter mediu retainer which does not interfere with the fit of th septum element into the filter vessel, or interfere wit filtration flow, and which is thick enough to retain at least some particulate filter medium in the scoured areas of the septum, it is generally desirable to provide thickness to the particulate filter medium retaine winding which approximates the thickness of the filte medium layer.
  • any particulate filte medium which is applied in a thicker coating in areas o high turbulence, and is not confined by the particulate filter medium retainer, may in fact be eroded away by the scouring action of turbulent flow conditions, but only to the effective depth defined by the particulate filter medium retainer.
  • the particulate filter medium retainer is not dependent on any narrowly defined pattern dimensions, so long as the pattern admits the particulate filter medium and allows it to fill the interstices from the septum surface to the outer limits of the retainer structure. If these criteria are met, it is generally preferred that the openness of the pattern afford the smallest practical openings, since the larger the openings, the more susceptible to the effects of turbulence the particulate filter medium will be. As a general rule, spacings of up to about 1 cm have proved to be generally effective and are reasonably convenient, although openings of up to as much as about 5 cm, but more often up to 2.5 cm, will still be surprisingly effective.
  • the particulate filter medium retainer may be any suitable material for the intended environment of use, and includes synthetic polymer fiber yarns and the like selected from the group consisting of polyolefins, polyamides, polyesters, polyacrylics, pol sulfides, polyimides, polyether-etherketones, poly benzimidazoles, carbon fibers, and blends and mixtures of such fibers.
  • synthetic polymer fiber yarns and the like selected from the group consisting of polyolefins, polyamides, polyesters, polyacrylics, pol sulfides, polyimides, polyether-etherketones, poly benzimidazoles, carbon fibers, and blends and mixtures of such fibers.
  • the basic structure of the septum will also be largely conventional and familiar to those of ordinary skill in the art. It is important that the structure be sufficient to receive and support the particulate filter medium retainer, but as those of ordinary skill will readily recognize, most of the septa employed in the art will ordinarily meet such criteria without change, or with readily achieved adaptations.
  • the present invention with septa of spiral wound yarn configuration, and particularly those taught in our related application, Serial No. 07/395,512, filed August 18, 1989, discussed above.
  • the preference is based on the added convenience available in the manufacture of a spiral wound particulate filter ediur. retainer as a continuation of the windin ⁇ operation employed in the manufacture of the septu structure itself.
  • the spiral wind configuration to achieve the open pattern of the particulate filter maxim retainer is not a great departure in manufacturing technique or equipment from that employed in the formation of the basic septum, and is preferably a change in winding pattern and length with the same yarn used in the base septum winding.
  • the diameter of the septum be reduced by a small amount, at least in the region to which the particulate filter medium retainer will be employed, to avoid interference within the filtration vessel.
  • the added annular reinforcement of the septum achieved by the application of the particulate filter medium retainer, it is often possible to reduce the depth of the septum winding without concern that backwash conditions may damage the septum.
  • the particulate filter medium retainer of the present invention with other types of septa commonly used in the art, including metallic structures, ceramic structures, and the like.
  • septa commonly used in the art, including metallic structures, ceramic structures, and the like.
  • a variety of such structures are generally known to those of ordinary skill in the art, and may be employed when desired and appropriate to the particular environment of use and requirements of manufacture.
  • the selection of the septum is not narrowly significant to the effectiveness of the particulate filter medium retainer of the present invention, although spiral wound types are preferred for their many known virtues and their particular convenience and effectiveness when employed with the particulate filter medium retainer of the present inventio .
  • the septum structure employed be based on the use of a tubular, perforated core to support the septum structure.
  • Such cores are essential to spiral wound yarns, and are often employed to assure sufficient physical properties in the use of other types of septa. As discussed below, particular advantages may be achieved in the case of spiral wound yarn septa by adapting certain parameters of such core structures.
  • Septa are either closed at one end, and open at the other, or open at both ends, depending on the requirements of the housing where they will be employed.
  • the opening is to permit egress of filtrate after passage through the septum, and to admit the fluid employed for backwashing operation.
  • One open end is adapted to be manifolded into the appropriate structure in the filtration vessel, such as a tube sheet or header plate or the like, in conventional fashion. In usual fashion, these functions are most often, and generally most conveniently achieved by the employment of end caps which engage the ends of the septum and the core.
  • the annular, imperforate segment extends from the end cap, i.e., from the open end of said tubular core, along the length of the core for a length of about 0.5 to about 15 cm, although more often length of about 0.75 to about 4 cm, and preferably abou 0.75 to 2 cm is preferred.
  • the axial seal affords a sufficient protection tha substantial, or even complete, loss of the applie particulate filter medium in such region will not occasio a filtration failure, since the radial seal achieved in such regions with ordinary winding tension in the formation of the septum is sufficient to preclude flo along the axis of the septum to an open -region. Substantially all flow through the septum in such regions is blocked, and with it, the potential for filtration failure.
  • the particulate filter medium retainer not be employed over the entire surface of the septum, or in areas not exposed to significant turbulence in operation. Since the particulate filter medium retainer adds to the diameter of the septum structure, it may produce interference with the fitting of the septa or with flow properties within the filtration vessel. In addition, backwash may be more efficient if excessive coverage by the particulate filter medium retainer is avoided.
  • Figs. 1 and 2 illustrate a preferred embodiment of the present invention, exemplifying the best mode for practice of the invention.
  • FIG. 1 an exploded perspective view of a septum core assembly is shown of core tube (1) and two open end caps (2) and (2') .
  • Core tube (1) is a spiral wound sheet of perforated material, preferably steel, and most preferably stainless steel, having a substantial number of perforations (20) distributed over the surface of the material. The spiral configuration is fixed by welding, shown at seam (21) . While core tube (1) is generally cylindrical, it may have axial, spiral or circumferential depressions formed in the surface to aid in flow from the septum winding to be applied to one of the perforations (20) in use.
  • the core tube may be formed of other materials and in other specific configurations familiar to those of ordinary skill in the art, including formed polymers, other metals, and the like.
  • the present invention may be employed with any core tube convenient, although that shown in Fig. 1 and described above is preferred.
  • the core assembly also includes two end caps (2) and (2'), as illustrated in Fig. 1.
  • both end caps (2) and (2') are open-ended and identical, although it should be understood that one or both may be substituted with different configurations to meet the requirements of a specific installation, and may have any specific configuration suited to the equipment and requirements of use, excepting the portion which mates with the core tube (1) and which subsequently received th septum winding, as discussed below.
  • the end cap (2) is normally steel, preferabl stainless steel, and is made up of annular rim (3) an face (4) which together are adapted, in well know fashion, to sealably engage a seat assembly disposed o and forming a part of a tube sheet or header plate in th filtration vessel (not shown) .
  • the seal may be augmente by gaskets and/or O-rings (also not shown) in customar fashion.
  • cylindrical member (5) Projecting axially and inwardly from face (4) i cylindrical member (5) , provided with raised cylindrica portion (6) , defining an axial flow port (7) to provid ingress and egress of liquid during operation.
  • the inne portion of cylindrical member (5) has an outside diamete substantially equal to the inside diameter of a terminal portion of core tube (1) , and is adapted to slidably fit within core tube (1) .
  • the raised cylindrical portion (6) defines a shoulder (8) which serves as a stop for core tube (1) .
  • the outside diameter of cylindrical portion (6) is preferably substantially equal to the outside diamete of core tube (1) .
  • End caps (2) and (2') are slid into engagement with core tube (1) . They are preferably fixed in place by convenient means, preferably by tack welding or the like, in close abutment with shoulder (8) .
  • the completed septum core assembly is then provided with the septum winding (10) and the resin retainer winding (11), shown in Fig. 2.
  • the septum may be made of a variety of materials and forms, the spiral winding of a continuous multifilament bulked yarn is preferred, particularly yarn bulked by air jet entanglement, such as Taslanized® yarns and the like. Polypropylene yarns are preferred, although others maybe employed, as discussed above.
  • the technique for winding of septum (10) in a closed diamond pattern, is well known in the art. Septum winding (10) is applied over the core assembly of Fig.
  • Segments (6) and (6') may have any convenient length sufficient to form the radial seal when the septum winding (10) is applied, from as little as about 0.5 cm, up to as much as about 15 cm, preferably about 0.75 cm to about 4 cm, and most preferably about 0.75 to 2 cm.
  • a conventional end cap with no cylindrical segment (6) may be employed to avoid any needless reduction in effective filtration area. It is generally preferred to employ the radial seal over the cylindrical ' segment (6) on at least one open end of the septum.
  • the winding operation is continued with a different winding pattern, and preferably over a shorter span of the length of the septum and preferably using the same yarn as that employed to form septum winding (10) .
  • This second winding in an open diamond spiral pattern, forms integral particulate filter medium retainer (11) .
  • Such winding procedures are also well known in the art.
  • the retainer winding (11) should be applied over the areas of the septum subject to high turbulence, which are generally at one end, except that it should be terminated at or preferably slightly overlying the radial seal, and not extend completely to the end cap to avoid interference in seating of the septum.
  • the winding (11) is preferably terminated at least 0.5 cm, preferably at least about 0.75 cm, from the end cap face (4) and annular rim (3) , and perhaps slightly more, leaving a portion (12) of septum winding (10) adjacent to end cap annular rim (3) and face
  • the radial seal area (12) When the filter medium precoat is formed, the radial seal area (12) will experience substantially no flow, and will receive little or no coating of the filter medium.
  • the retainer winding (11) it is possible to substitute for the retainer winding (11) , particularly when a septum of a material other than the winding (10) is employed, a sleeve of extruded polymer mesh. Such materials are generally familiar to those of ordinary skill in the art.
  • One to five plies of such mesh, preferably about three plies, will form a filter medium retainer comparable to the open diamond pattern winding (11) .

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

Abstract

Une structure de rétention de milieu filtrant particulaire solidaire est incorporée dans les septums (10 et 12) à précouches, notamment des septums à fils enroulés en spiral, par agencement d'un enroulement (11) de configuration ouverte, de préférence du même fil, sur au moins les surfaces des septums (10, 12), soumises à de fortes turbulences, par rapport à une épaisseur de la couche de milieu filtrant particulaire à précouches à utiliser. Un fil filamenteux continu gonflant texturé par jet d'air d'un polypropylène est préféré. La précouche appliquée remplit les interstices se trouvant à l'intérieur de l'enroulement de rétention de milieu filtrant particulaire, au moins à partir de la surface du septum jusqu'à la surface de l'enroulement ouvert et le milieu filtrant particulaire (non représenté) sert à empêcher d'être emporté par lavage de la surface du septum. Lorsque les conditions de filtration sont intenses, par exemple pour de l'eau d'alimentation de chaudière pour des installations génératrices de puissance électrique à combustible nucléaire, l'amélioration de la fiabilité de la filtration ainsi obtenue est d'une très grande importance.
PCT/US1992/001976 1991-03-25 1992-03-13 Septum a precouches dote d'une structure de retention de milieu filtrant particulaire solidaire WO1992016280A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67477591A 1991-03-25 1991-03-25
US674,775 1991-03-25

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WO1992016280A1 true WO1992016280A1 (fr) 1992-10-01

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568381A1 (fr) * 1992-04-30 1993-11-03 Morton International, Inc. Filtre pour générateur de gaz enroulé en spirale et sa méthode de production
WO1995015805A1 (fr) * 1993-12-08 1995-06-15 Flexibulk Limited Membrane pour filtre et filtre ainsi equipe
DE4401116A1 (de) * 1994-01-17 1995-08-24 Faudi Feinbau Filterkerze
DE19540876A1 (de) * 1995-11-02 1997-05-07 Gessner & Co Gmbh Mehrschichtige Separationseinheiten
US6206205B1 (en) * 1998-10-29 2001-03-27 Donaldson Company, Inc. Pleated filter and support tube therefor
RU2170605C1 (ru) * 1999-11-11 2001-07-20 Алферов Михаил Ярославович Фильтровальный элемент
WO2016018644A1 (fr) * 2014-07-28 2016-02-04 Graver Technologies Llc Bouchon ed pour élément filtre à précouche

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319793A (en) * 1965-06-08 1967-05-16 Jr Charles A Miller Cord wound filter element
US3828934A (en) * 1972-02-03 1974-08-13 Carborundum Co Media for wound filter elements
US4219997A (en) * 1978-08-17 1980-09-02 Phillips Petroleum Company Spun-like continuous multifilament yarn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319793A (en) * 1965-06-08 1967-05-16 Jr Charles A Miller Cord wound filter element
US3828934A (en) * 1972-02-03 1974-08-13 Carborundum Co Media for wound filter elements
US4219997A (en) * 1978-08-17 1980-09-02 Phillips Petroleum Company Spun-like continuous multifilament yarn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568381A1 (fr) * 1992-04-30 1993-11-03 Morton International, Inc. Filtre pour générateur de gaz enroulé en spirale et sa méthode de production
WO1995015805A1 (fr) * 1993-12-08 1995-06-15 Flexibulk Limited Membrane pour filtre et filtre ainsi equipe
DE4401116A1 (de) * 1994-01-17 1995-08-24 Faudi Feinbau Filterkerze
DE4401116C2 (de) * 1994-01-17 1998-07-02 Faudi Filtersysteme Gmbh Filterkerze
DE19540876A1 (de) * 1995-11-02 1997-05-07 Gessner & Co Gmbh Mehrschichtige Separationseinheiten
US6206205B1 (en) * 1998-10-29 2001-03-27 Donaldson Company, Inc. Pleated filter and support tube therefor
RU2170605C1 (ru) * 1999-11-11 2001-07-20 Алферов Михаил Ярославович Фильтровальный элемент
WO2016018644A1 (fr) * 2014-07-28 2016-02-04 Graver Technologies Llc Bouchon ed pour élément filtre à précouche

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Publication number Publication date
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