EP4192597A1 - Appareil pour filtrer en continu une suspension de boue - Google Patents

Appareil pour filtrer en continu une suspension de boue

Info

Publication number
EP4192597A1
EP4192597A1 EP21754899.9A EP21754899A EP4192597A1 EP 4192597 A1 EP4192597 A1 EP 4192597A1 EP 21754899 A EP21754899 A EP 21754899A EP 4192597 A1 EP4192597 A1 EP 4192597A1
Authority
EP
European Patent Office
Prior art keywords
filter
filter body
pressure
hollow shaft
suspension
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP21754899.9A
Other languages
German (de)
English (en)
Inventor
Alireza ESLAMIAN
Martin SCHIFKO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ESS Holding GmbH
Original Assignee
ESS Holding GmbH
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 ESS Holding GmbH filed Critical ESS Holding GmbH
Publication of EP4192597A1 publication Critical patent/EP4192597A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B01D33/23—Construction of discs or component sectors thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
    • B01D33/37—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/52—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
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/68—Retarding cake deposition on the filter during the filtration period, e.g. using stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/18—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/16—Rotary, reciprocated or vibrated modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/282—Filtering elements with a horizontal rotation or symmetry axis

Definitions

  • the invention relates to a device for continuously filtering a sludge suspension with a hollow shaft rotatably mounted in a housing which is flow-connected to the interior of a disc-shaped filter body surrounded by a filter membrane and protruding radially from the hollow shaft for draining off a filtrate.
  • a device for continuously filtering a sludge suspension with a hollow shaft rotatably mounted in a housing which is flow-connected to the interior of a disc-shaped filter body surrounded by a filter membrane and protruding radially from the hollow shaft for draining off a filtrate.
  • a filter membrane surrounded by a filter membrane
  • a device for filtering a suspension is known from WO2000047312A1.
  • the cavity of a filter body surrounded by a filter membrane is flow-connected to a hollow shaft. If a suspension flows against the filter body, the solid particles in the suspension are held back by the filter membrane, while a liquid portion of the suspension flows through the interior of the filter body to the hollow shaft and can be discharged as filtrate.
  • the thickness of the filter cake covering the filter membrane increases, which significantly reduces the filtrate flow and thus the filtration efficiency.
  • the solids content increases in the direction of flow of the device.
  • WO2000047312A1 In order to maintain a constant filtration speed, the pressure on the suspension side can be increased, or the filter cake can be cleaned off the filter membrane at regular intervals.
  • the cleaning step is made possible by rotating the filter membrane around the hollow shaft.
  • the disadvantage of this is that, especially in the case of suspensions with a high solids content and when strongly attached to the Filter membrane pressed filter cake such a relative movement for cleaning the filter cake is not sufficient, which is why WO2000047312A1 further proposes to provide two mutually parallel hollow shafts, each with a plurality of filter bodies arranged thereon.
  • the relative movement of the filter bodies arranged on the different hollow shafts can result in mutual shearing of the filter cake on the filter membrane.
  • shearing can only take place if the filter cakes of the respective filter membranes are sufficiently thick that there is contact between the respective filter cakes, so that the method is only effective after a certain filtration time or filter cake thickness.
  • only part of the filter cake can be removed by shearing.
  • the invention is therefore based on the object of creating a device of the type mentioned at the outset, which allows a higher throughput of the filtrate independently of the solids content of the suspension to be filtered, the filter cake thickness and the filtration time.
  • the invention solves the problem in that the radius of the filter body increases in the circumferential direction from a low-pressure radius to a high-pressure radius in order to reduce the free housing cross-section.
  • the suspension in the region of the filter body, which has been set in rotation is subjected to a pressure profile which changes over time and is preferably sinusoidal. If the free housing cross-section at a reference point, i.e. the cross-section in the housing that is not occupied by the filter body, is reduced by rotating the filter body and thus by moving the high-pressure radius towards this reference point, the suspension is compressed at this reference point. This increases the pressure difference between the suspension side and the filtrate side, which promotes rapid filtration of the suspension.
  • centrifugal forces caused by the rotary motion of the hollow shaft can be used to support the detachment of the filter cake. Due to the pressure increase and pressure reduction according to the invention, constant filter conditions can be created on the filter body even after a long filter period. Complete cleaning can be promoted by strong turbulence in the suspension. This can be achieved by a rapid pressure drop at the reference point.
  • radius means the distance between the pivot point of the filter body and a point on the circumference of the filter body.
  • the filter body has an interior space surrounded by a filter membrane.
  • surrounded means that the filter membrane delimits the interior at least in sections.
  • the device according to the invention can easily be subjected to thorough cleaning at regular intervals as part of maintenance work.
  • water or another suitable cleaning agent is pumped from the hollow shaft to the interior of the filter body and then through the filter membrane into the housing of the device.
  • particularly strongly pressed filter cake residues are released from the filter membrane, which can be flushed out of the housing together with other suspension residues.
  • At least two parallel hollow shafts can be provided in the housing, the filter bodies of which are offset from one another in the axial direction with a gap. It is basically sufficient that only one of the hollow shafts is designed according to the invention, while the other hollow shaft can also be flow-connected to other filter bodies and does not have to be rotatably mounted. As a result of the measures described, varying pressure distributions can also occur in housings with large cross sections whose entire cross-section are established. Due to a relative movement of the hollow shafts to one another, increased turbulence occurs between the filter bodies arranged on them.
  • the filter bodies can advantageously together form a mixer which ensures homogeneous mixing of the suspension, which further promotes uniform filtration.
  • the filter bodies of the at least two hollow shafts parallel to one another are located overlap at least partially in the axial direction.
  • the filter cake shears off one another between filter bodies that are adjacent in the axial direction. Due to the inventive shape of the filter bodies in combination with the overlapping of the mutually staggered filter bodies of the respective hollow shafts, the filter bodies can act as shredders for sludge lumps in the suspension, which promotes further homogenization.
  • suspensions with a low solids content and suspensions with a solids content of up to 98% can be pumped.
  • an additional pump can be provided on the suspension side and/or a vacuum pump on the filtrate side.
  • the displacement effect described can also be used to operate the device according to the invention exclusively with the inherent pressure of the suspension to be filtered, because if the pressure of the suspension to be filtered is sufficient, the filter bodies limiting the free cross section are themselves displaced and the hollow shaft is thus set in rotation.
  • the device can thus be used, for example, for the energy-saving filtration of flowing water, with the flow of the flowing water being used to drive the hollow shaft.
  • the hollow shafts with the filter bodies arranged thereon are mirrored to one another about a common plane of symmetry.
  • the suspension can be actively pressed from filter body to filter body across the cross section, with the cyclically decreasing, largest free cross section between the filter bodies and the housing being enlarged, so that even suspensions with a high solids content that are difficult to convey are transported in the direction of the outlet can be carried out without having to rely on pumps or other conveying devices.
  • the device according to the invention can be used to make up the suspension, it is proposed that downstream of the filter body, a pelletizing device be installed, which is driven by the hollow shaft.
  • the pelletizing device can be, for example, a pelletizing disk, which agglomerates the dewatered sludge.
  • a filter body can comprise a plurality of filter body segments which are preferably connected to one another in a form-fitting, detachable manner.
  • the filter body segments can be connected to one another, for example, via tongue and groove connections running in the radial direction, which facilitates consecutive arrangement of the individual filter body segments on the hollow shaft for assembling the filter body.
  • the cavities of the filter body segments can be separated from one another, so that a fluid connection between different filter body segments of a filter body can only take place via the hollow shaft.
  • the filter body segments of a filter body have different geometric configurations, it being possible for the radii of adjacent filter body segments to be essentially the same in the border region.
  • filter body segments can be created if they are made of porous plastic. As a result, no separate filter membranes have to be provided, since the filtration is achieved through the porosity of the plastic.
  • the filter body segments can be designed in one piece. This means that the filter body segments form a one-piece plastic part together with any tongue and groove connections for connecting several filter body segments, with connection nipples for connecting the filter body segments with the hollow shaft and/or other filter body segment parts.
  • PE polyethylene
  • PP polypropylene
  • PTFE polytetrafluoroethylene
  • PVDF polyvinylidene fluoride
  • TPU polyurethane
  • EVA ethylene vinyl acetate
  • PC polycarbonate
  • PA polyamide
  • PES polyethersulfone
  • the filter membrane has two filter membrane discs arranged at a distance parallel to one another.
  • the filtered suspension enters the interior of the filter body between the filter membrane discs through these filter membrane discs, so that the filter membrane discs preferably run transversely to the axial direction of the hollow shaft.
  • the filter membrane discs can be inserted into a fluid-impermeable base body of the filter body segment.
  • the filter membrane discs can be removed from the filter body segment and cleaned independently of the base body, without having to dismantle the filter body segments or even the filter body from the hollow shaft.
  • the base body is impermeable to fluids, so it does not have a filter function and therefore has to be cleaned much less frequently.
  • the base body can, for example, be made of plastic, in particular natural or synthetic rubber, whereby a fluid-tight connection is achieved between the base body and the insertable filter membrane disks, which can preferably be inserted radially to the hollow shaft.
  • the filter membrane discs are mounted particularly gently, so that sensitive filter materials such as ceramics can also be used at high rotational speeds. A similar effect is achieved when the base body has a metallic core and is covered with plastic.
  • filter membrane discs In principle, various materials are conceivable as filter membrane discs, but particularly robust conditions result if the filter membrane discs are made of porous plastic.
  • porous plastic polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyurethane (TPU), ethylene vinyl acetate (EVA), Polycarbonate (PC), Polyamide (PA) and Polyethersulfone (PES) can be used. Synthetic rubbers mixed with urea can also be used for this purpose.
  • the filter membrane disks have a ceramic core.
  • the ceramic cores can be enclosed by a porous plastic, so that the filter performance is further increased and the sensitive ceramic cores are at the same time protected by the porous plastic against vibrations or the like.
  • Fig. 2 is a detail view of the partially cutaway device in a perspective view on an enlarged scale
  • Fig. 3 is a section on an enlarged scale along the line III-III of Fig. 1,
  • Fig. 4 shows a section along the line IV-IV of Fig. 3,
  • FIG. 5 shows a diagram of the pressure profile in the suspension along an axial flow line and in the filtered filtrate in the axial direction of the device
  • FIG. 6 shows a section corresponding to FIG. 3 of a second embodiment of the device according to the invention
  • Fig. 8 shows a section along the line VIII-VllI of Fig. 7.
  • a device for continuously filtering a suspension has a housing 1 in which a hollow shaft 2 is rotatably mounted.
  • the hollow shaft 2 is provided with several disc-shaped, radially projecting from the hollow shaft 2 filter bodies 3 flow-connected. This can be achieved in that the hollow shaft 2 is flow-connected via openings 4 to an interior space 6 surrounded by a filter membrane 5 . If a suspension flows to the filter body 3 , the solid particles are held back by the filter membrane 5 , while the liquid portion penetrates the filter membrane 5 , flows into the interior 6 and leaves the device as filtrate via the hollow shaft 2 .
  • the driving force behind filtration is the pressure difference between the suspension side and the filtrate side.
  • the radius r of the filter body 3 increases in the circumferential direction from a low-pressure radius n to a high-pressure radius m to reduce the free housing cross section, as is disclosed in FIG. 3 .
  • the free cross-section of the housing changes when the filter body rotates, as a result of which the suspension is subjected to a pressure profile that changes over time at a reference point that is fixed in space.
  • the pressure difference between the suspension side and the filtrate side increases, which promotes rapid filtration.
  • the pressure difference between the suspension side and the filtrate side decreases.
  • the filter cake Due to these constant pressure fluctuations, the filter cake is loosened and can detach from the filter membrane.
  • the cleaning effect can be further improved by the centrifugal force generated by the rotation of the filter bodies 3 .
  • a rapid drop in pressure can also promote cleaning. This can be achieved if the filter body 3 has a compression section 7, which is formed starting from the low-pressure radius n by increasing the radius r of the filter body 3 up to the high-pressure radius m, and an expansion section 8, which is formed starting from the high-pressure radius m by reducing the radius r of the filter body 3 down to the low pressure n, with the reduction in the radius r in the expansion section 8 taking place faster than the increase in the compression section 7.
  • the expansion section 8 therefore occupies a smaller sector of the disc-shaped filter body 3 than the compression section 7.
  • a plurality of filter bodies 3 can be arranged on the hollow shaft 2, the high-pressure radii m of which are offset relative to one another in a circumferential direction.
  • a filter body 3 is always offset in the same circumferential direction as the previous filter body 3 , so that the filter bodies 3 form a spiral running around the hollow shaft 2 .
  • Particularly favorable conditions result when the offset of the high-pressure radii m between two filter bodies 3 following one another in the axial direction is between 1° and 45°.
  • the offset can be 10°, for example, as is shown in the exemplary embodiment.
  • FIG. 5 shows the schematic pressure profile generated by the offset of the filter bodies 3 along an axial exemplary flow line (not shown) running over the length of the device at a specific point in time. While the pressure 9 on the filtrate side remains constant, the pressure 10 on the suspension side has a wave-like profile due to the offset of the filter bodies 3 in the axial direction and thus due to the different sizes of the free cross-sectional areas. The increasing pressure over the length goes hand in hand with the increasing solids content of the suspension. The areas with a large pressure difference öph favor a high
  • the pressure profile shown in FIG. 5 corresponds to the pressure profile along a flow line at a fixed point in time. Due to the constant rotation of the hollow shaft 2, there is naturally a phase shift in the pressure curve over time.
  • At least two hollow shafts 2 running parallel to one another can be provided in the housing 1, the filter bodies 3 of which are offset from one another in the axial direction with a gap.
  • particularly large housing cross-sections can also be used for a high throughput without the need for special production with regard to the size of the filter body 3 .
  • the filter bodies 3 which are offset from one another with a gap can also at least partially overlap, forming an overlapping region 11 which can change over time as a result of the rotation.
  • the filter cakes of adjacent filter bodies 3 located on the filter membranes 5 can shear off one another, and the turbulence in the suspension can increase.
  • the filter bodies 3 arranged according to the invention also act as a crushing or mixing unit for any inhomogeneities in the suspension.
  • the hollow shafts 2 can also be actively and evenly conveyed through the device according to the invention, the hollow shafts 2, as shown for example in FIGS. 1 to 3, with the filter bodies 3 arranged thereon relative to one another around a common plane of symmetry. If the hollow shafts move at the same speed but in opposite directions, the suspension is actively pushed in the axial direction, which means that no further conveyor devices are required.
  • a pelletizing plate 12 can be used for preparing the filtered suspension, which is arranged downstream of the filter body 3 and is also driven by the hollow shaft 2 .
  • the suspension can be introduced or discharged via connection pieces 13 .
  • each filter body 3 can comprise a plurality of filter body segments 14 .
  • the filter body segments 14 can be releasably connected to one another via a form fit.
  • the filter body segments 14 can be releasably connected to one another via a tongue and groove connection 15, 16 running in the radial direction.
  • a filter body segment 14 can have a fluid-impermeable base body 17 into which two filter membrane discs 20 acting as top and bottom surfaces 18, 19 are inserted.
  • the base body 17 spans the cavity 6 of the filter body segment 14 together with the filter membrane discs 20 .
  • the filter body segments 14 can be detachably flow-connected to the hollow shaft 2 via connection nipples 21 .
  • the filter membrane discs 20 can in turn be detachably connected to the base body 17 via a tongue and groove connection 22, 23 (FIG. 8).
  • the filter membrane disks 20 can be made of porous plastic.
  • the filter membrane disks 20 can include a ceramic core 24 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un dispositif de filtrage en continu d'une suspension de boues comportant un arbre creux (2) qui est monté rotatif dans un boîtier (1) et qui est en communication fluidique avec la chambre intérieure (6), qui est entourée par une membrane filtrante (5), d'un élément filtrant discoïde (3) qui fait saillie radialement à partir de l'arbre creux (2), pour éliminer un filtrat. Pour permettre un débit plus élevé du filtrat, indépendamment de la teneur en solides de la suspension de boues à filtrer, l'épaisseur du gâteau de filtration et la durée de filtration, selon l'invention, le rayon (r) de l'élément filtrant (3) augmente dans la direction circonférentielle à partir d'un rayon de basse pression ri jusqu'à un rayon de haute pression rh afin de réduire la section transversale de logement libre. Drawing_references_to_be_translated
EP21754899.9A 2020-08-05 2021-08-04 Appareil pour filtrer en continu une suspension de boue Withdrawn EP4192597A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50657/2020A AT523265B1 (de) 2020-08-05 2020-08-05 Vorrichtung zum kontinuierlichen Filtrieren einer Schlammsuspension
PCT/AT2021/060269 WO2022027079A1 (fr) 2020-08-05 2021-08-04 Appareil pour filtrer en continu une suspension de boue

Publications (1)

Publication Number Publication Date
EP4192597A1 true EP4192597A1 (fr) 2023-06-14

Family

ID=77338437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21754899.9A Withdrawn EP4192597A1 (fr) 2020-08-05 2021-08-04 Appareil pour filtrer en continu une suspension de boue

Country Status (4)

Country Link
US (1) US20230302383A1 (fr)
EP (1) EP4192597A1 (fr)
AT (1) AT523265B1 (fr)
WO (1) WO2022027079A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2146867B2 (de) * 1971-09-20 1975-06-26 Hoechst Ag, 6000 Frankfurt Schelbendrehfiner
JPS6458309A (en) * 1987-08-28 1989-03-06 Yagishita Goshi Kaisha Crossflow type filter
JPH0763591B2 (ja) * 1993-12-10 1995-07-12 工業技術院長 液体膜分離装置
AT406936B (de) * 1999-02-08 2000-10-25 Andritz Patentverwaltung Verfahren und vorrichtung zur querstromfiltration
AT408842B (de) * 2000-07-13 2002-03-25 Andritz Ag Maschf Filter
DE102005022643B4 (de) * 2005-05-11 2007-08-30 Buss-Sms-Canzler Gmbh Querstromfilter
DE102010015871A1 (de) * 2010-03-09 2011-09-15 Tu Kaiserslautern Vorrichtung zur verfahrenstechnischen Behandlung feststoffreicher Suspensionen
US9604162B2 (en) * 2014-04-11 2017-03-28 Advanced Filtration Technologies Inc. Rotary disc filter device
KR101994066B1 (ko) * 2019-01-18 2019-07-02 주식회사 대승엔지니어링 디스크 회전형 농축 탈수기

Also Published As

Publication number Publication date
AT523265B1 (de) 2021-07-15
US20230302383A1 (en) 2023-09-28
WO2022027079A1 (fr) 2022-02-10
AT523265A4 (de) 2021-07-15

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