WO2009006890A1 - Structure de nettoyage de filtre, dispositif comprenant cette structure de nettoyage de filtre, et procédé d'utilisation de la structure de nettoyage de filtre - Google Patents

Structure de nettoyage de filtre, dispositif comprenant cette structure de nettoyage de filtre, et procédé d'utilisation de la structure de nettoyage de filtre Download PDF

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Publication number
WO2009006890A1
WO2009006890A1 PCT/DK2007/050088 DK2007050088W WO2009006890A1 WO 2009006890 A1 WO2009006890 A1 WO 2009006890A1 DK 2007050088 W DK2007050088 W DK 2007050088W WO 2009006890 A1 WO2009006890 A1 WO 2009006890A1
Authority
WO
WIPO (PCT)
Prior art keywords
cleaning structure
filter
filter cleaning
filters
nozzles
Prior art date
Application number
PCT/DK2007/050088
Other languages
English (en)
Inventor
Martin Nowak
Original Assignee
Niro A/S
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 Niro A/S filed Critical Niro A/S
Priority to PCT/DK2007/050088 priority Critical patent/WO2009006890A1/fr
Publication of WO2009006890A1 publication Critical patent/WO2009006890A1/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
    • B01D46/2407—Filter candles
    • 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
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
    • B01D46/60—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel arranged concentrically or coaxially
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/68—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements
    • B01D46/682—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements by nozzles
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/79—Regeneration of the filtering material or filter elements inside the filter by liquid process

Definitions

  • a filter cleaning structure an arrangement comprising such a filter cleaning structure, and a method of using the filter cleaning structure
  • the present invention relates to a filter cleaning structure for cleaning of a stationary gas filter assembly including one or more individual filters extending in an axial direction, comprising a number of cleaning liquid nozzles. Furthermore, the invention relates to an arrangement including a filter cleaning structure and a stationary gas filter assembly including one or more filters. The present invention also relates to a method of cleaning a stationary gas filter assembly including one or more individual filters extending in an axial direction by means of a number of nozzles when operation of the filter assembly is discontinued.
  • filters in relation to process equipment such as e.g. spray dryers and fluid bed processing equipment is well known. Use of filters is, however, not limited to these types of equipment. All process equipment using filters for separating particles from a gas may use the present invention.
  • Such filters may be located in a separate filter unit, or may be integrated in the process equipment as seen in e.g. US 6,463,675 (Assignee: Niro A/S).
  • US 6,676,720 describes a filter system with focus on draining the filters after CIP.
  • US 6,149,716 describes a method of CIP of bag filters.
  • US 6,332,902 describes a filter unit with focus on the filter gas cleaning means during operation, which further are used for filter CIP when out of operation. (Assignee of all the above-mentioned patents: Niro A/S).
  • Filters may be of any material suitable for the purpose, and may for instance be bag filters made of felt, or may be woven of e.g. polyester or Teflon® (PTFE).
  • a felt or polyester material may be permeable for a CIP fluid, while Teflon® is not.
  • a filter bag may be constructed of a permeable material and hereafter coated with an impermeable material, e.g. a polyester material coated with Teflon®.
  • the material used in such filters is flexible.
  • filters may also be non-flexible made of e.g. steel, polymer or ceramics. Filters are typically of cylindrical shape and typically mounted vertically, but other known types of filter shape and placement may be used.
  • the active components may not escape from the processing equipment and therefore impermeable filter bags may be prescribed for this area of application.
  • filter bags In a CIP process such filter bags are being cleaned both from the outside, i.e. the product side, and from the inside, i.e. the clean gas side.
  • a controlled valve or drain may be provided in the bottom of the filter, in particular in the case when the bottom is impermeable.
  • a prior art valve of this kind is e.g. disclosed in US 5,444,892 (Assignee: Niro-Aeromatic AG).
  • CIP-nozzles must be self-cleaning.
  • tubes or pipes carrying the cleaning fluid must be connected to every single nozzle entailing a complex and costly system.
  • nozzles are traditionally not placed in the bottom wall of filter chambers or process equipment, due to the fact that the bottom wall often slopes towards a centre axis and is inherently positioned at some distance to the filters to be cleaned. Placing nozzles in the bottom wall of the filter unit or process equipment would therefore not contribute significantly to the quality of the cleaning of the filters, and as a result the bottom surface of the filters are not cleaned satisfactorily.
  • a filter cleaning structure for cleaning of a stationary gas filter assembly including one or more individual filters extending in an axial direction, comprising a number of cleaning liquid nozzles, characterized in that said filter cleaning structure is moveable in relation to said filters.
  • said filter cleaning structure By making the filter cleaning structure moveable, it becomes possible to clean filters much more effectively as fewer nozzles are required. Nozzles, e.g. mounted in the wall of the processing equipment, are in themselves expensive components, and reducing the number of nozzles will thus reduce the cost of the entire structure. Furthermore, a less complex construction is provided, in that the amount of piping or the like for the cleaning liquid to each nozzle is also reduced, due to the reduced number of nozzles. Thus, a more simple and cost effective structure is provided.
  • said filter cleaning structure comprises a longitudinal main element extending in a direction substantially parallel to the axial direction of said filter or filters, said main element being provided with one or more nozzles.
  • said filter cleaning structure may comprise one or more arm elements protruding from said main element in a direction substantially perpendicular to said main element, said arm element or elements being provided with one or more nozzles.
  • said filter cleaning structure comprises one or more branch elements protruding from said arm elements, said branch element or elements each being provided with one or more nozzles.
  • This arrangement enables the structure to reach more positions within the filter unit or process equipment, thus eliminating or reducing the areas being shaded for by other filters. Reducing the risk of one filter shading for another, also renders it possible to reduce the amount of cleaning fluid used for the cleaning of a filter assembly as the cleaning becomes more effective.
  • each of the elements of the filter cleaning structure is tubular and adapted to supply cleaning liquid to said plurality of nozzles. Hereby, no concurrently piping or tubing is necessary.
  • the filter cleaning structure may be moved in any suitable man- ner.
  • driving means for rotating said cleaning structure about an axis parallel to the longitudinal axis of the filters may be provided.
  • the driving means may comprise a motor, preferably a hydraulic motor, which may utilize said cleaning liquid for actuation.
  • said driving means may include a planet type gear.
  • the number of said arm elements is larger than one, and said arm elements are evenly distributed on the circumference of the longitudinal main element.
  • an outbalancing of weight in the overall structure is obtained, providing advantages e.g. in the form of less wear and tear on bearings.
  • an arrangement including a filter cleaning structure and a stationary gas filter assembly including one or more filters, wherein said one or more filters is/are cylindrical is provided.
  • a method of cleaning a stationary gas filter assembly including one or more individual filters extending in an axial direction by means of a number of nozzles is provided. The method comprises the steps of: providing a cleaning structure having a plurality of nozzles, discontinuing the operation of said gas filter assembly, supplying cleaning liquid to said nozzles, spraying said cleaning liquid through said plurality of nozzles, moving said cleaning structure a sufficient number of times to clean substantially all surfaces of all filters, drying filters, and continuing the operation of said gas filter assembly.
  • Fig. 1 is an isometric view seen of an embodiment of the arrangement according to the invention
  • Fig. 2 is a side view of the arrangement of Fig. 1;
  • Fig. 3 shows the arrangement of Figs 1 and 2 seen from below;
  • Fig. 4 is an isometric view of another embodiment of the arrangement according to the invention.
  • Fig. 5 is a side view of the arrangement of Fig. 4;
  • Fig. 6 shows the arrangement of Figs 4 and 5 seen from below;
  • Fig. 7 is an isometric view of a plurality of filter cleaning structures in a further embodiment in connection with a filter assembly comprising a number of bag filters arranged in clusters;
  • Fig. 8 is a side view of the filter cleaning structures and filter assembly shown in Fig. 7;
  • Fig. 9 is a bottom view of the filter cleaning structures and filter assembly shown in Fig. 7.
  • a filter assembly generally designated 1 is shown (a filter unit).
  • the filter assembly 1 comprises a horizontal and circular filter support plate 2 supporting a number of vertical individual cylindrical filters 3 in one open end 3a of each filter 3. The other end of each filter 3b is closed and free.
  • the filters 3 are arranged in two circular concentric rows having a centre axis indicated by the letter A, as most clearly seen from Fig. 3.
  • the support plate 2 is in turn supported by an enclosure wall or other process equipment confining the filter assembly 1.
  • a filter cleaning structure 4 emerges from the vertical centre axis A of the concentric rows of filters 3.
  • this particular embodiment of the filter cleaning structure 4 has one vertical main element 5 and one horizontal arm element 6 protruding from the main element 5.
  • two branch elements 7, 8 protrude substantially perpendicular to the arm element 6 and substantially parallel to said main element 5, i.e. vertically, in a way so that the branches 7 are positioned among the filters 3 in a manner to be described in detail further on.
  • each branch element has a longitudinal extension, but other configurations are conceivable as well.
  • One branch element 7 projects from the arm element 5 at the radially outer end of the arm element 5 so as to describe a circle with a diameter slightly larger than the outer perimeter of the outermost filter row when the entire filter cleaning structure is rotated around its axis of rotation A coinciding with the centre axis of the filters 3.
  • the other branch element 8 projects from the arm element 5 at such a distance from the main element 5 so as to describe a circle with a diameter slightly larger than the outer perimeter of the innermost filter row when the entire filter cleaning structure is rotated around its axis of rotation A.
  • the other branch element 8 should be positioned at a smaller distance from the main element 5 than the outermost row of filters 3.
  • a drive 9 for moving the entire filter cleaning structure 4 is supported by the filter support plate 2.
  • the drive 9 is arranged for rotating the filter cleaning structure 4 about the axis of rotation A and is supported substantially on its own vertical centre.
  • the driving means may comprise a motor, e.g. a hydraulic motor utilizing cleaning liquid for actuation, and a planet type gear for ensuring adequate transmission of the driving torque in order to be able to control the rotational speed.
  • the drive 9 may be positioned outside the enclosure wall or whatever other process equipment that may confine the filter assembly 1.
  • a plurality of nozzles is provided on each of the elements of the cleaning structure 4 in the embodiment shown.
  • said plurality is constituted by a single nozzle 10 near the upper end or the main element 5.
  • the arm element 6 is provided with two nozzles 11 and 12 immediately beneath each row of filters 3.
  • Each branch element 7 and 8 is provided with a respective nozzle 13 and 14 positioned at such a distance from their connection to the arm element 6 that nozzles 10, 13 and 14 are at substantially the same level.
  • nozzles 10-14 located at the shown positions on said elements 5, 6, 7 and 8 (most clearly seen from Fig. 2), cleaning of a large part of the surface of each individual filter is feasible.
  • Other configurations of the nozzles are of course conceivable.
  • each nozzle may be of any conceivable kind suitable for the purpose.
  • each nozzle is an aperture in the corresponding element.
  • each nozzle may include a nozzle head, for instance comprises a rotating ball.
  • the nozzle head may be retractable or stationary.
  • the main element 5, the arm element 6 and each of the branch elements 7, 8 are tubular such that cleaning liquid may be supplied to the pluralities of nozzles through these elements.
  • the elements may comprise conduits for carrying the cleaning liquid.
  • the stationary gas filter assembly When the stationary gas filter assembly is to be cleaned by spraying cleaning liquid onto the external surface of the filters, the following operational steps are carried out: a) the operation of the gas filter assembly is discontinued, b) cleaning liquid is supplied to said nozzles from a suitable supply means, c) the cleaning liquid is sprayed through said plurality of nozzles, d) the cleaning structure is moved a sufficient number of times, i.e. in the embodiment shown rotated a number of rotations which may be predetermined according to the field of application of the filter assembly, and finally, after drying, e) continuing the operation of said gas filter assembly
  • the filter assembly 101 comprises a horizontal and circular filter support plate 102 supporting a number of vertical individual cylindrical filters 103.
  • the filter cleaning structure 104 emerges from said vertical centre axis A of said circular row of filters 103.
  • the filter cleaning structure 104 has one vertical main element 105 and one horizontal arm element 106 protruding from said main element 105.
  • This particular embodiment has only one branch element 107 protruding from said arm element 106.
  • Said branch element 107 is substantially perpendicular to the arm element 106 and substantially parallel to the main element 105, i.e. it extends vertically.
  • Nozzle 110 is provided on the main element 105, nozzle 111 on arm element 106 and nozzle 113 on branch element 107. Operation of the cleaning structure 104 is carried out as described in the above by activating the driving means 109.
  • Atomizing nozzles 120 for processing purposes are placed in the support plate 102 which in this case is the roof of a processing chamber also.
  • Figs 7 to 9 which all illustrate a third embodiment of the present invention.
  • Elements having the same or analogous function as corresponding elements in the second embodiment shown in Figs 4 to 7 carry the same reference numerals to which 100 has been added. Only differences relative to the first embodiment will be described in detail.
  • the embodiment of the actual cleaning structure 204 depicted in Figs 7 to 9 is substantially identical to the embodiment of the actual cleaning structure 104 depicted in Figs 4 to 7. Also the relative positioning of the individual filter cleaning structures 204 with regard to the individual circular rows of filters 203 in Figs 7 to 9 is substantially identical to the relative positioning of the same in Figs 4 to 7. Also in this embodiment, an atomizing nozzle 220 for processing purpose is placed in the support plate 202 which in this case is the roof of a processing chamber also. This embodiment, however, differs in that it comprises an arrangement of three individual cleaning structures 204 as well as three individual groups of filters 203, 203' and 203", each group being arranged in a circular row.
  • each set of circular, concentric rows is provided with a filter cleaning structure.
  • the operation of for instance cleaning structure 204 in relation to the group of filters 203 corresponds to the operation described in the above.
  • the group of filters 203' and 203" may operate in substantially the same manner as the group of filters 203.
  • mutually different configurations between the groups are of course possible.
  • more than one arm element may protrude from each main element of the filter cleaning structure.
  • Two arm elements could for instance be arranged with 180° between them in order to create a structure in gravitational balance.
  • three arms could be arranged with 120° between them and so on.
  • filters are individual cylindrical oblong filters.
  • One annular filter could be envisaged in some embodiments of the invention.
  • the described cleaning method takes place when the operation of the filter assembly is discontinued.
  • the cleaning structure may be purged with air or gas to secure that product does not enter into the cleaning structure.

Landscapes

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

Abstract

L'invention concerne une structure de nettoyage de filtre (4) qui est adaptée pour nettoyer un dispositif de filtration de gaz stationnaire incluant un ou plusieurs filtres (3) individuels. La structure de nettoyage de filtre (4) est mobile par rapport aux dits filtres (3) et comprend un élément principal longitudinal (5) s'étendant dans une direction sensiblement parallèle à la direction axiale du filtre ou des filtres, ledit élément principal étant équipé d'une ou plusieurs buses (10).
PCT/DK2007/050088 2007-07-10 2007-07-10 Structure de nettoyage de filtre, dispositif comprenant cette structure de nettoyage de filtre, et procédé d'utilisation de la structure de nettoyage de filtre WO2009006890A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DK2007/050088 WO2009006890A1 (fr) 2007-07-10 2007-07-10 Structure de nettoyage de filtre, dispositif comprenant cette structure de nettoyage de filtre, et procédé d'utilisation de la structure de nettoyage de filtre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK2007/050088 WO2009006890A1 (fr) 2007-07-10 2007-07-10 Structure de nettoyage de filtre, dispositif comprenant cette structure de nettoyage de filtre, et procédé d'utilisation de la structure de nettoyage de filtre

Publications (1)

Publication Number Publication Date
WO2009006890A1 true WO2009006890A1 (fr) 2009-01-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2007/050088 WO2009006890A1 (fr) 2007-07-10 2007-07-10 Structure de nettoyage de filtre, dispositif comprenant cette structure de nettoyage de filtre, et procédé d'utilisation de la structure de nettoyage de filtre

Country Status (1)

Country Link
WO (1) WO2009006890A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2304386A1 (fr) * 1975-03-20 1976-10-15 Alsthom Cgee Depoussiereur industriel a tambour
DE9100551U1 (fr) * 1991-01-18 1991-04-11 Schuko Heinz Schulte-Suedhoff Gmbh, 4518 Bad Laer, De
EP0552454A2 (fr) * 1992-01-07 1993-07-28 Bühler Ag Installation pour nettoyer les éléments filtrants d'un filtre
DE29505293U1 (de) * 1995-03-29 1995-07-20 Saechsische Landesgewerbefoerd Einrichtung zur Abreinigung von Filterpatronen
US5507851A (en) * 1994-07-15 1996-04-16 Kennington; H. L. Filter cleaning apparatus
WO1997048474A1 (fr) * 1996-06-19 1997-12-24 Moon Chan Park Appareil et procede de purification continue d'un gaz a l'aide d'un filtre a nettoyage continu, et filtre a feutre
EP1457246A1 (fr) * 2003-03-13 2004-09-15 DIOSNA Dierks & Söhne GmbH Dispositif de traitement de matériaux pulvérulents
WO2005014159A1 (fr) * 2003-08-07 2005-02-17 I.M.A. Industria Macchine Automatiche S.P.A. Dispositif de granulation pour le traitement de produits pulverulents
WO2005124017A1 (fr) * 2004-06-18 2005-12-29 Metso Paper, Inc. Dispositif et procede de nettoyage d’un filet de filtration de la tour de ventilation d’un secheur de pate, tour de ventilation d’un secheur de pate et secheur de pate
WO2006051739A1 (fr) * 2004-11-09 2006-05-18 Matsushita Electric Industrial Co., Ltd. Climatiseur

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2304386A1 (fr) * 1975-03-20 1976-10-15 Alsthom Cgee Depoussiereur industriel a tambour
DE9100551U1 (fr) * 1991-01-18 1991-04-11 Schuko Heinz Schulte-Suedhoff Gmbh, 4518 Bad Laer, De
EP0552454A2 (fr) * 1992-01-07 1993-07-28 Bühler Ag Installation pour nettoyer les éléments filtrants d'un filtre
US5507851A (en) * 1994-07-15 1996-04-16 Kennington; H. L. Filter cleaning apparatus
DE29505293U1 (de) * 1995-03-29 1995-07-20 Saechsische Landesgewerbefoerd Einrichtung zur Abreinigung von Filterpatronen
WO1997048474A1 (fr) * 1996-06-19 1997-12-24 Moon Chan Park Appareil et procede de purification continue d'un gaz a l'aide d'un filtre a nettoyage continu, et filtre a feutre
EP1457246A1 (fr) * 2003-03-13 2004-09-15 DIOSNA Dierks & Söhne GmbH Dispositif de traitement de matériaux pulvérulents
WO2005014159A1 (fr) * 2003-08-07 2005-02-17 I.M.A. Industria Macchine Automatiche S.P.A. Dispositif de granulation pour le traitement de produits pulverulents
WO2005124017A1 (fr) * 2004-06-18 2005-12-29 Metso Paper, Inc. Dispositif et procede de nettoyage d’un filet de filtration de la tour de ventilation d’un secheur de pate, tour de ventilation d’un secheur de pate et secheur de pate
WO2006051739A1 (fr) * 2004-11-09 2006-05-18 Matsushita Electric Industrial Co., Ltd. Climatiseur

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