WO2021234626A1 - Dispositif de filtrage et son procédé de nettoyage - Google Patents

Dispositif de filtrage et son procédé de nettoyage Download PDF

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Publication number
WO2021234626A1
WO2021234626A1 PCT/IB2021/054376 IB2021054376W WO2021234626A1 WO 2021234626 A1 WO2021234626 A1 WO 2021234626A1 IB 2021054376 W IB2021054376 W IB 2021054376W WO 2021234626 A1 WO2021234626 A1 WO 2021234626A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
brush
fluid
drain
filter device
Prior art date
Application number
PCT/IB2021/054376
Other languages
English (en)
Inventor
Johan Robert RENKEMA
Original Assignee
Hd Filters B.V.
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 Hd Filters B.V. filed Critical Hd Filters B.V.
Publication of WO2021234626A1 publication Critical patent/WO2021234626A1/fr

Links

Classifications

    • 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
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
    • 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
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/46—Edge filtering elements, i.e. using contiguous impervious surfaces of flat, stacked bodies
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/10—Brush filters ; Rotary brush filters

Definitions

  • Filter devices are used in many different applications for filtration of raw fluids such as liquids and gases comprising contaminating substances, for example in water purification or industrial exhaust gas processing. These filter devices may intercept and retain contaminating particles suspended in the raw fluid in or on a filter medium while allowing the filtered fluid to pass through the filter medium, thereby removing the contaminating particles from the fluid. These filter devices are called mechanical filter devices.
  • Filter devices wherein the filter medium is cleaned while the raw fluid flow and the filtration operation are not interrupted exist, for example the UDI 6Matic.
  • This filter uses a screen as a filter medium and includes movable suction nozzles which suck the filter cake from the screen from the upstream side of the screen.
  • This filter device uses many moving parts and requires at least one additional pump for the fluid flow. Although small when compared to some other types of filter devices, the fluid volume used during a cleaning operation is still fairly large.
  • the filter member comprises one or more filter brushes to filter the fluid and a fluid supply to supply the fluid to the filter brushes, wherein each of the filter brushes comprises multiple brush members which are arranged at the filtration distance from each other to filter particles from the fluid, wherein the filter device defines a filtration flow path that extends from the fluid supply through the filter brushes into the filtrate drain, wherein the filter device further comprises a brush deformation member which is movable along the filter brushes to displace at least a portion of at least one first brush member with respect to at least one adjacent second brush member, thereby locally positioning the at least one first brush member and the at least one second brush member at a cleaning distance from each other, the cleaning distance being larger than the filtration distance, and wherein the filter device defines a washing flow path that extends from the fluid supply into the wash drain and passes between the at least one first brush member and the at least one second brush member while being located at the cleaning distance from each other.
  • the brush deformation member comprises at least one scraper and the filter brushes comprise at least one fixed end and at least one free end, wherein the scraper is movable along a scraping path with respect to the filter brushes at a free end of the brush members, and wherein the scraper protrudes at least partially into at least one filter brush within at least a part of the scraping path.
  • the wash drain is movable together with the scraper with respect to the filter brushes along at least a part of the scraping path.
  • the wash drain is movable to a position near the at least one first brush member and the at least one second brush member being located at the cleaning distance from each other.
  • the scraper is movable with respect to the wash drain along the scraping path from a first scraper position into a second scraper position and vice versa, wherein the second scraper position is on an opposite side of the wash drain when compared to the first scraper position when seen along the scraping path.
  • the filter device further comprises a fluid flow regulating unit which is in fluid communication with the wash drain.
  • the fluid flow regulating unit comprises a pressure regulator connected to a wash drain pipe which is connected to the wash drain.
  • the at least one first brush member is configured to spring back to a default position at said filtration distance from the at least one second brush member in a sweeping motion when the scraper passes beyond said at least one first brush member.
  • the sweeping motion of the at least one first brush member further cleans the at least one first brush member by moving the at least one first brush member through the washing flow path and by accelerating and subsequently decelerating the at least one first brush member.
  • a method of performing a cleaning operation on a filter device comprising a deformable filter member, is characterized in that a filter deformation member is moved along the filter member, thereby locally deforming said filter member to widen at least one filtration opening in said filter member from a filtration distance to a cleaning distance while a fluid is flowing through the filter member, in that said fluid is forced through said filter device during said cleaning operation, and in that at least part of said fluid is collected through a wash drain downstream of said filter member.
  • said wash drain is moved along with said deformation member downstream of said filter member.
  • the method comprises the step of removing less than 100% of the filtration agent from the filter brushes.
  • Figure 3 shows a view in cross-section of the filter device of Fig. 1 performing a filtration operation
  • Figure 8 shows a perspective view of a part of the third embodiment of the filter device according to the invention comprising the V-shaped plates of Fig. 7A,
  • FIGS 9A-F show enlarged views of a scraper of a fourth embodiment of the filter device according to the invention, wherein the scraper is movable with respect to the wash drain, and
  • FIGS 10A-F show enlarged views of a scraper of a fifth embodiment of the filter device according to the invention, wherein the scraper is movable with respect to the wash drain.
  • the filtrate drain 5 is arranged near a top end 34 of the filter device 1 and the fluid supply 4 is arranged along a circumference 36 of the filter device 1.
  • the filtrate drain 5 may be arranged along the circumference 36 and the fluid supply 4 may be arranged near the top end 34.
  • the filtrate drain 5 or the fluid supply 4 may be positioned near a bottom end 35 of the filter device 1.
  • one of the fluid supply 4 and the filtrate drain 5 may be arranged near the top end 34 and the other of the fluid supply 4 and the filtrate drain may be arranged near the bottom end 35
  • a washing flow path 20 that extends from the fluid supply 7 into the wash drain 8 and passes between the at least one first brush member 17 and the at least one second brush member 18 being located at the cleaning distance 19 from each other.
  • a detail view of the action of the brush deformation member 16 of Fig. 4A is shown in Fig. 5.
  • the wash drain 8 provides a flow path of least resistance such that all contaminated fluid passing through the brush member 17,18, while being a cleaning distance apart, will be captured and drained away into the wash drain while the filtrate drain 5 continues to receive filtered fluid.
  • the washing flow path 20 of the contaminated wash fluid 6 comprises a fluid inflow 20A, a brush washing flow 20B, a drain inflow 20C and a fluid removal flow 20D.
  • the fluid 6 flows into the filter device 1 in the fluid inflow 20A.
  • the fluid then flows into the filter brushes 3, between the at least one first brush member 17 and the at least one second brush member 18 being located at the cleaning distance 19 from each other, in the brush washing inflow 20B.
  • the fluid 6 subsequently flows into the wash drain 8 in the drain inflow 20C before the fluid 6 is removed from the filter device 1 in the fluid removal flow 20D, wherein the fluid 6 leaves the filter device 1 through a wash drain pipe 42 which is connected to the wash drain 8.
  • the fluid 6 is supplied by the fluid supply 7.
  • the fluid inflow 20A coincides with the inflow 9A of the fluid 2.
  • a separate wash fluid supply may be present to supply the wash fluid 6.
  • the filtration operation may continue in a region of the filter brushes 3 which is not influenced by the brush deformation member 16.
  • the flow of fluid in a filtered state 43 flowing out of the filtrate drain 5 may be reduced, since washing flow path 20 may have a significantly lower flow resistance than the filtration flow path 9, causing nearly all fluid 2 flowing into the filter device 1 to follow the washing flow path 20 instead of the filtration flow path 9.
  • Fig. 6A shows a detail view of a filter brush 3 of the filter device 1 of Figs. 1-3, showing the basic principle of the filtration operation.
  • Fluid 2 comprising contaminating particles 15 flows through the filter brush 3 during a filtration operation.
  • the contaminating particles 15 are retained in the filter brush 3, cleaning the fluid 2.
  • Fig. 6B shows a detail view of the filter brush 3 of Fig. 4A, while a cleaning operation is performed, showing the basic principle of the cleaning operation.
  • the brush deformation member 16 moves past the filter brush 3 in a scraping direction 22, sequentially displacing first brush members 17 with respect to adjacent second brush members 18.
  • the brush deformation member 16 increases the distance between the first and second brush members 17, 18 from the filtration distance 12 to the cleaning distance 19.
  • the fluid supply 7 is the fluid supply 4 and consequently, the fluid 6 is the fluid 2.
  • the filter brushes 3 are thus washed during a cleaning operation by the same fluid 2 that they filter during a filtration operation. No separate fluid supply 7 is required.
  • the scraper 21 By moving the central scraping tube 32 along the longitudinal device axis 33, the scraper 21 is movable along a scraping path 50 with respect to the filter brushes 3 at a free end 11 of the filter brushes 3.
  • the longitudinal device axis 33 is parallel to the scraping path 50.
  • the scraper 21 protrudes partially into the filter brushes 3 over a protrusion distance 25 within at least a part of the scraping path 50.
  • the protrusion distance is between 0.5 and 2 millimetres, although other values may be used for different applications.
  • the wash drain 8 is movable together with the scraper with respect to the filter brushes 3 along at least a part of the scraping path 50.
  • the cleaning operation comprises moving the scraper 21 along the filter brushes 3 to locally place the first and second brush members 17, 18 at the cleaning distance 19 from each other, such that the fluid flow between said adjacent first and second brush members 17, 18 is generated due to the decreased flow resistance between said adjacent first and second brush members 17, 18.
  • This decreased flow resistance allows a large fluid flow.
  • the first and second brush members 17, 18 are cleaned by the fluid flow. Moving the scraper 21 along the filter brushes 3 allows different sets of first and second brush members 17, 18 to be displaced sequentially, allowing these to be cleaned as well.
  • the first flexible end plate 37A is allowed to flex such that the final brush members 13 can also be cleaned.
  • the first flexible end plate 37B is allowed to flex such that the final brush members 13 can also be cleaned.
  • This filter device 1 allows cleaning of the filter brushes 3 while the fluid supply is uninterrupted and without reversal of fluid flow through the filter brushes 3. Due to the locally large fluid flow, the scraper 21 may be moved along the filter brushes 3 relatively quickly, such that cleaning of the filter brushes 3 requires little time and consumes little fluid 6.
  • the flow of fluid 2 supplied to the filter device 1 may continue uninterrupted during the cleaning of the filter brushes 3.
  • a filtering operation of the filter device 1 may also be performed uninterrupted during the cleaning of the filter brushes 3 by a further section of the filter brushes, which further section does not comprise the first and second brush members 17, 18 that are currently displaced.
  • Fig. 7A shows a schematic image of brush members 13 of a third embodiment of a filter device 1 according to the invention comprising V-shaped plates 28.
  • Fig. 7B shows schematic image of a top view of a filter device 1 comprising filter brushes 3 that comprise the V-shaped plates of Fig 7A.
  • a schematic perspective view of the filter brushes 3 of the filter device 1 of Fig. 7B is shown in Fig. 8.
  • the V-shaped plates 28 may comprise metal or plastic.
  • the brush members 13 may comprise fibres 29, as shown in Figs. 1-6B. These fibres may comprise metal or plastic.
  • the filter brushes 3 may further comprise a filtration agent 38 such as micro-organisms or a catalyst, which may be arranged on a surface 39 of at least one brush member 13. During a cleaning operation, less than 100% of the filtration agent 38 may be cleaned off the filter brushes 3. It may be necessary to remove more than 0% of the filtration agent 38 during a cleaning operation, because the filter brushes 3 may foul otherwise due to for example growth of micro-organisms or degradation of the catalyst.
  • a filtration agent 38 such as micro-organisms or a catalyst
  • Fig. 9A shows a scraper 21 in the first scraping position.
  • Moving the central scraping tube 32 downwards pushes the scraper 21 against the first scraper stop plate 45, see Fig. 9B.
  • Moving the central scraping tube 32 further downwards with sufficient force allows the scraper 21 to slide over de central scraping tube 32 until the scraper contacts the first scraper butt 44A, see Fig. 9C.
  • the scraper 21 is now in the second scraper position 27, on the opposite side of the wash drain 8 when compared to the first scraper position 26. Moving the scraper 21 from the second scraper position 27 to the first scraper position 26 may be performed in a similar way, see Figs. 9D-9F.
  • FIG. 10A-F show consecutive stages of the locking and unlocking of a scraper 21 and a sealing of a wash drain pipe in a fifth embodiment of a filter device according to the invention.
  • the scraper 21 is fitted on a wash drain pipe 42 that travels over a sealing o-ring 55.
  • the wash drain pipe 42 of this particular embodiment has a double conic design along a scraper travel path 58.
  • the wash drain pipe 42 is moving along the scraping direction 22 as shown in figure 10A.
  • the scraper 21 is upstream of the wash drain 8 with a conic lock at position 26.
  • the scraper will collide with the v-shaped rubber seal 56 and an surface 45, as shown in Figure 10B. This collision creates an impact shock and unlocks the conic lock at position 26 between the scraper 21 and the wash drain pipe 41.
  • the wash drain pipe 42 will continue its travel along the scraper travel path 58 until it reaches the scraper travel path lock at position 27, see figure IOC.
  • the impact shock will push the scraper 21 in its conic lock 27.
  • the v-shaped rubber seal 56 seals without any further force on the wash drain pipe 42.
  • the scraper 21 has a strong fit in the conical seat on the flushing tube 42 and a perfect fit in the V-shaped rubber seal 56 that hermetically seals the wash drain pipe 21 so that no leakage will occur through the wash drain 8. No further force is needed to seal the filter accurately.
  • the filter device is in its filter mode of operation.
  • the wash drain pipe 42 is moving along the scraping direction 22.
  • the scraper 21 is upstream of the wash drain 8 with a conic lock at position 27 as shown in figure IOC.
  • the scraper 21 has a strong fit in the conical seat on the flushing tube, the scraper 21 has a perfect fit in the V-shaped rubber seal 56 and hermetically seals the wash drain pipe 21 so that no leakage can occur through the wash drain 8. No further force is needed to seal the filter tightly.
  • the filter is now in the filter mode of operation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Un dispositif de filtrage est configuré pour filtrer un fluide, le dispositif de filtrage définissant un chemin d'écoulement de filtration qui s'étend à partir d'une alimentation en fluide à travers un élément filtrant, en particulier une ou plusieurs brosses de filtre, dans le drain de filtrat. Le dispositif de filtre comprend en outre un élément de déformation de filtre qui est mobile le long de l'élément filtrant pour se déformer localement dans une partie dudit élément filtrant, par exemple en déplaçant au moins une partie d'au moins un premier élément de brosse par rapport à au moins un second élément de brosse adjacent, ce qui permet de positionner localement le ou les premiers éléments de brosse et le ou les seconds éléments de brosse à une distance de nettoyage l'un de l'autre, la distance de nettoyage étant supérieure à la distance de filtration. Le dispositif de filtre définit un trajet d'écoulement de lavage qui s'étend à partir de l'alimentation en fluide dans un drain de lavage et qui passe entre le ou les premiers éléments de brosse et le ou les seconds éléments de brosse, tout en étant ladite distance de nettoyage l'une de l'autre.
PCT/IB2021/054376 2020-05-20 2021-05-20 Dispositif de filtrage et son procédé de nettoyage WO2021234626A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2025635A NL2025635B1 (en) 2020-05-20 2020-05-20 Filter device
NL2025635 2020-05-20

Publications (1)

Publication Number Publication Date
WO2021234626A1 true WO2021234626A1 (fr) 2021-11-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023218289A1 (fr) * 2022-05-10 2023-11-16 Folliet Laurent Dispositif de filtration

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468354A (en) * 1944-08-18 1949-04-26 Osborn Mfg Co Filtration apparatus
FR2105570A5 (en) * 1970-09-04 1972-04-28 Ferrier Daniel Self-clearing filter - automatic, mechanical deformation of filter sheet periodically dislodges sediment
EP0076016A1 (fr) * 1981-09-29 1983-04-06 Norbertus Wouter Hendrik Verduyn Dispositif de filtration
US20160059156A1 (en) * 2011-10-28 2016-03-03 Alfa Laval Corporate Ab Methods and apparatus for treating water and wastewater employing a cloth filter
CN109432867A (zh) * 2018-11-21 2019-03-08 南通中国科学院海洋研究所海洋科学与技术研究发展中心 一种鳃式过滤器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468354A (en) * 1944-08-18 1949-04-26 Osborn Mfg Co Filtration apparatus
FR2105570A5 (en) * 1970-09-04 1972-04-28 Ferrier Daniel Self-clearing filter - automatic, mechanical deformation of filter sheet periodically dislodges sediment
EP0076016A1 (fr) * 1981-09-29 1983-04-06 Norbertus Wouter Hendrik Verduyn Dispositif de filtration
US20160059156A1 (en) * 2011-10-28 2016-03-03 Alfa Laval Corporate Ab Methods and apparatus for treating water and wastewater employing a cloth filter
CN109432867A (zh) * 2018-11-21 2019-03-08 南通中国科学院海洋研究所海洋科学与技术研究发展中心 一种鳃式过滤器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023218289A1 (fr) * 2022-05-10 2023-11-16 Folliet Laurent Dispositif de filtration
FR3135402A1 (fr) * 2022-05-10 2023-11-17 Laurent FOLLIET Dispositif de filtration

Also Published As

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