WO2016183657A1 - Buse de lavage de filtre à contre-courant - Google Patents

Buse de lavage de filtre à contre-courant Download PDF

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Publication number
WO2016183657A1
WO2016183657A1 PCT/CA2015/050450 CA2015050450W WO2016183657A1 WO 2016183657 A1 WO2016183657 A1 WO 2016183657A1 CA 2015050450 W CA2015050450 W CA 2015050450W WO 2016183657 A1 WO2016183657 A1 WO 2016183657A1
Authority
WO
WIPO (PCT)
Prior art keywords
plates
nozzle
plate
jetting stream
aperture
Prior art date
Application number
PCT/CA2015/050450
Other languages
English (en)
Inventor
Todd William Kirk
Daniel Clifford Whitney
Douglas Walker Lee
Original Assignee
Exterran Water Solutions Ulc
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 Exterran Water Solutions Ulc filed Critical Exterran Water Solutions Ulc
Priority to PCT/CA2015/050450 priority Critical patent/WO2016183657A1/fr
Publication of WO2016183657A1 publication Critical patent/WO2016183657A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/14—Downward filtration, the container having distribution or collection headers or pervious conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/38—Feed or discharge devices
    • B01D24/40—Feed or discharge devices for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4626—Construction of spray heads specially adapted for regeneration of the filter material or for filtrate discharging

Definitions

  • the present invention relates generally to the field of liquid filtration using non-fixed filter media, and more specifically to a nozzle for use in a method and system for removing filtered contaminants from non-fixed filter media filter beds, such as granular filter media filter beds, during periodic cleaning cycles.
  • the carrier medium used to flush the filter media is most commonly the clean filtrate fluid.
  • many systems large volume storage of clean filtrate is required to provide surge capacity when the backwash cycle draws a high-volume rate to flush the media during this step.
  • Some methods utilize the high-volume water jets to both agitate and back flush, which is a combination of common steps 1 and 2.
  • such systems still generate large volumes of backwash liquid that must be stored and recycled back through the process.
  • separation of the contaminants from the filter media is typically done by flowing the slurry in a continuous flow path over a cleaning element, located external to the filter housing, where interspersed larger particulates are removed from the slurry, and returning the withdrawn filter material back to the filter housing (See U.S. Pat. Nos. 3,992,291 and 3,953,333).
  • This method adds significant cost and size to the filter since it requires various external conduits, vessels, valves and equipment.
  • U.S. Pat. No. 4,787,987 discloses an in-situ method of separating the contaminants from the filter media by a screen, of size slightly smaller than the filter media size, contained within the vessel below the filter media.
  • That method agitates and slurrifies the media and contaminants by action of a high-volume liquid pump.
  • make-up liquid is added to the vessel at substantially the same rate that the concentrated contaminated liquid is removed through the screen means while the filter media is retained within the filter housing.
  • a more recent development involves a method of in-situ cleaning of agglomerated contaminants from granular filter media.
  • This method combines a low rate of contaminated liquid with a gas, such as air or natural gas, to create a jetting stream.
  • This jetting stream is dispersed into the filter media through one or more radial nozzles disposed within the filter media.
  • the gas exits the radial nozzles as a bubble dispersion within the liquid.
  • the jetting stream rises up through the filter media, it expands the bed to break large contaminant agglomerations and fluidizes the individual filter media granules to dislodge and mobilize smaller contaminant agglomerations within the interstitial spaces of the filter media.
  • the radial nozzles consist of top and bottom circular plates of a diameter D and are spaced apart by a gap that is smaller than the smallest sized filter media granule.
  • the two plates are separated by a spacer washer and bolted together which creates dead areas around the circumference of the jet where the bolts block the flow. Further, the two plates limit the amount of flow.
  • the present invention provides for a nozzle for use within a filter for inputting a jetting stream into the filter media, the nozzle comprising: an inlet for communication with a jetting stream source; a plurality of plates stacked parallel and abutting one another, the plurality of plates comprising at least a top plate and a bottom plate, one of the plates having an aperture through the center thereof for receiving the jetting stream, wherein between adjacent plates at least one space is provided extending from the outside edge of the plates to the interior of plates and in fluid communication with the aperture for channelling the jetting stream radially outward from and substantially parallel with the longitudinal plane of the plate.
  • the plurality of plates further comprising one or more intermediate plates have a top side facing towards the top plate and a bottom side facing towards the bottom plate and each intermediate plate comprises an aperture through the center thereof for receiving the jetting stream, the apertures of the intermediate plates and the top plate being in fluid communication.
  • the space is provided by a channel in the one of the plates and the side of the adjacent parallel stacked and abutting plate.
  • the space is provided by a channel on the top side of each plate and the bottom side of the adjacent parallel stacked and abutting plate.
  • the channel in the plate further defines a ridge which abuts the bottom side of the adjacent parallel stacked and abutting plate.
  • the ridge has an impellor shape for guiding the jetting stream radially outward from the aperture.
  • the ridge has a height of between 2 and 30 mm. In a further embodiment of the nozzle or nozzles outlined herein, a total number of plates is from 2 to 9.
  • the total number of plates is from 3 to 7.
  • the total number of plates is 5. In a further embodiment of the nozzle or nozzles outlined herein, the total number of plates is 6.
  • the interior diameter of each aperture in the center of the intermediate plates and the top plate is successively reduced for plates positioned towards the bottom plate.
  • the reduction in interior diameter of the aperture in the center of plates is sufficient to substantially counteract the reduction in flow volume or flow rate of the jetting stream as it approaches the bottom plate.
  • the gap defined by the distance between stacked plates is successively reduced for plates positioned towards the bottom plate.
  • the reduction in the gap is sufficient to substantially counteract the reduction in flow volume or flow rate of the jetting stream as it approaches the bottom plate.
  • the plates comprise an aligning notch in their outer periphery enabling visual or physical alignment of the stacked rings prior to connection of the plates.
  • the plates of the nozzle are welded together, preferably welded at a position of the outer periphery thereof.
  • an outer diameter of each the plates of the nozzle is substantially equal.
  • an outer diameter of each of the plates of the nozzle is substantially varied.
  • the present invention provides for a nozzle for use within a filter for inputting a jetting stream into the filter media, the nozzle comprising: an inlet for communication with a jetting stream source; a plurality of plates stacked parallel and abutting one another, the plurality of plates comprising at least a top plate, one or more intermediate plates and a bottom plate, the top plate and the intermediate plates having an aperture through the center thereof for receiving the jetting stream, wherein between adjacent plates a plurality of spaces are provided extending from the outside edge of the plates to the interior of the plates and in fluid communication with the aperture in the center of the plates for channelling the jetting stream radially outward from and substantially parallel with the longitudinal plane of the plates; wherein the plurality of spaces is provided by a plurality of channels in the one of each of the plates and the side of the adjacent parallel stacked and abutting plate and wherein each channel is defined by a flanking ridge that abuts the adjacent parallel stacked and abutting plate, each ridge
  • FIG. 1 is a vertical sectional view of an example of a non-fixed media housing, showing internal components including an example of a backwash nozzle encompassed by the present invention that may be used for inputting a jetting stream for backwash cleaning of a filter media
  • FIG. 2 A is an exploded view of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIG. 2B is an assembled isometric view of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIGS. 3A, B and C are top, side and isometric views, respectively, of an example of a top plate of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIGS. 4A, B and C are top, side and isometric views, respectively, of an example of an inner plate of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIGS. 5 A, B and C are top, side and isometric views, respectively, of another example of another inner plate of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIGS. 6A, B and C are top, side and isometric views, respectively, of another example of another inner plate of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIGS. 7A, B and C are top, side and isometric views, respectively, of an example of a bottom plate of one example of a backwash nozzle for inputting a jetting stream for backwash cleaning of a filter media;
  • FIG. 8 is horizontal sectional view across the filter housing diameter, showing an example of a possible position of the jetting nozzles in a 45° angle between a filtrate outlet sieve manifold;
  • FIG. 9 is a three-dimensional sectional view of the FIG. 8 embodiment as viewed from the underside of the filter housing vessel;
  • FIG. 10 is a top cross-sectional view similar to that shown in FIG. 8 but with the radial nozzles located just below and aligned with the outlet sieve manifold members showing an alternate location of the radial nozzles;
  • FIG. 11 shows an alternate embodiment wherein a plurality of filter housings, each incorporating internal components for carrying out a backwash cleaning method, the plurality of filter housings incorporated into one horizontal filter housing separated into individual compartments by internal baffles;
  • FIG. 12 shows a schematic of one embodiment of a top view of a non-fixed media filter vessel showing an example of the layout of the backwash nozzles;
  • FIG. 13 shows a schematic of one embodiment of a top view of a horizontal non-fixed media filter vessel showing an example of the layout of the backwash nozzles.
  • the filter vessel 10 houses a bed 12 of granular filter medium.
  • the illustrative filter housing is a pressure-rated vessel having a 2:1 ellipsoidal upper and lower heads. Other filter vessel shapes and designs may be used and will not affect the principle operation of the invention.
  • the granular filter media 12 may be any of a number of materials chosen based upon the characteristics of the liquid to be filtered and the properties of the contaminants.
  • granulated media For filtration of water containing suspended oil droplets and solids contaminants, a number of different granulated media may be used, such as for example, granulated black walnut shells, ceramic, sand, and/or multimedia.
  • a space 14 exists above the filter bed 12 to provide room for the bed to expand during the cleaning cycle. It will be appreciated that any suitable filter housing, granular filter media and/or space dimension may be utilized.
  • the filter vessel 10 typically also includes inlet distributors 20 for the introduction of contaminated liquid from an exterior conduit and dispersing the liquid substantially uniformly across the cross-section of the filter vessel.
  • a backwash outlet header 22 may also be installed in the top of the filter vessel for receiving flow of jetting stream and liberated contaminants during a cleaning cycle, for example a backwash cycle.
  • the outlet header may also contain a mechanical sieve means 23, shown here as slotted pipe or wedge- wire where the open slots are of a diameter less than the smallest media granule size to prevent any mobilized filter media from escaping the vessel during the backwash cycle.
  • FIG. 1 also shows an example of an outlet header 30 to which may be attached a mechanical sieve 33, shown here as slotted pipe or wedge-wire. After passing through the filter bed, the cleaned filtrate exits the filter vessel through the openings in the sieve 33.
  • the diameter of the sieve openings is typically smaller than the smallest filter media granule diameter so that the media is retained inside the vessel during operation.
  • FIG. 1 shows a plurality of radial nozzles 40 having outlets just below the bottom tangent of the mechanical sieves 33.
  • FIG. 1 An example of the nozzle 40 shown in FIG. 1 is shown in more detail with reference to FIGS. 2 to 7.
  • the nozzle 40 is comprised of a plurality of plates, generally two or more, and in various embodiments two to nine plates and in further embodiments between four and seven plates, the plates arranged parallel and adjacent each other. It will therefore be appreciated that the nozzle 40 shown with reference to FIGS. 2 to 7 which comprises five plates is merely illustrative of one embodiment of a nozzle according to the present invention and it is not intended to be limited to the number of plates.
  • the nozzle 40 is comprised of at least a top plate 100 and a bottom plate 108.
  • the nozzle includes further intermediate plates.
  • the cleaning jetting flows through the center aperture 120 in the top plate 100 and the center aperture 114, 116 and 118 in each of the intermediate plates 102, 104 and 106, respectively, and radially outward through channels formed in each of the intermediate plates and the bottom plate.
  • the intermediate plates of the nozzle 40 and the bottom plate include a ridge such as that shown as 110, 124, 128 and 132 in FIGS. 4 to 7, respectively.
  • the ridges define a channel shown as 112, 122, 126 and 130 in FIGS. 4 to 7, respectively, which together with the adjacent plate define a space or void through which the jetting stream flows into the filter media bed during the cleaning cycle.
  • each plate of the nozzle 40 is stacked parallel, adjacent and abutting the next plate and as such, the space or void has a height defined by the depth of the channel (or the height of the ridge) in each plate.
  • the height of the space, and therefore the height of the ridge should be less than a minimum diameter of the media to be cleaned in the filter to ensure that the media, especially if the media is non-fixed, does not penetrate into the space in the nozzle during regular operation or flow of the fluid through the filter.
  • the height of the ridge may be from 2-30 mm.
  • the plates may include a notch 42 that may be used for aligning the plates for connection therebetween.
  • the plates may be welded to each other, for example on the outer periphery.
  • the plates may be tack welded on the outer periphery where the ridges meet the adjacent plate.
  • the ridges are shown as having an impeller shape for providing both the void or space between the channel and bottom side of the adjacent plate as well as for guiding the jetting stream radially outward from the nozzle. It will however be appreciated that any number of shapes may be used. The shapes and their % of open area may be used to control velocity and flow, and may be modified to suit different processes and fluids.
  • the ridges, for example the impellers may be offset or staggered to aid or allow in evenly distributing the flow of the jetting stream radially outward from the nozzle. It will be appreciated that there is not flow where the ridge prevents flow across the plate outward from the inner aperture.
  • offsetting the ridges allows for more even flow radially outward from the inner aperture of the nozzle. Offsetting of the ridges may be adjusted as required or desired and if different shaped ridges are used. As compared to plates which are bolted together, even in a plurality of plates, the bolts/washers are generally in line in each stage (gap) of the nozzle thereby not allowing or at least reducing flow outward about the entire circumference.
  • the ridges may be machined into the plates or may be added using any suitable means.
  • Each of the intermediate plates and as well as the top plate include an aperture at the center of the plate to allow for the jetting stream to pass into the nozzle for partial redirection radially outward through the spaces or voids defined by the channel of each plate and the underside of the adjacent plate.
  • the bottom plate does not include an aperture as the jetting stream does not pass the bottom plate but is completely redirected radially outwards.
  • each aperture of each plate may be successively smaller to account for the reduction in flow rate and flow volume of the jetting stream as the jetting stream is radially output by each plate.
  • each aperature has a diameter Di wherein each diameter Di of a successive plate may be smaller than the previous plate. The diameters of each plate may be adjusted/modified based on the process as desired or required given the application.
  • the gap may be reduced successively for plates positioned towards the bottom plate to counteract the reduction in flow thereby substantially equalizing flow rate.
  • a typical but non-limiting elevation of the radial nozzle outlet void is shown as being approximately even with the bottom tangent of the mechanical sieve pipes 33.
  • the bottom vessel head may be filled with a solid material, such as grout or concrete, up to the bottom of the mechanical sieve pipes. This solid material acts as a support base for the filter media granules during normal filter operations since filter media below the mechanical sieve pipes is essentially of no effective use.
  • the radial nozzle outlet voids are placed near the bottom tangent of the sieves pipes 33 so that filter media near the base of the tank can be contacted by the jetting stream.
  • the placement of nozzles near the base of the filter media bed also allows the jetting stream to clear the openings of the sieve slots of possible media or contaminant obstructions.
  • the height of the outlet voids of the radial nozzles may be elevated above the outlet manifold so that the jetting dispersion can penetrate to the full extremities of the vessel without interference from the outlet manifold or sieve screens.
  • the jetting stream which may be comprised of a mixture of liquid and gas premixed outside of the filter housing, may be carried to the radial nozzle via a conduit 35.
  • This conduit is shown in the drawing as a straight pipe segment connected to a pipe 90° elbow turning down and connected to the top circular disc of radial nozzle.
  • FIGS. 8 and 9 show an optional placement of a plurality of nozzles 40 across the vessel cross- section in relation to a vessel/nozzle centerline radius R.
  • This vessel nozzle radius R will vary with filter media type, filter vessel diameter, contaminant loading, and contaminant physical properties. For this particular scenario, an R value in the range of 25% to 36% of the vessel diameter D will typically provide adequate coverage of the jetting stream for effective media agitation cleaning.
  • FIGS. 11 and 12 shows an optional alternate location of the four nozzles shown as dotted circles 42 rotated 45° from the positions shown in FIG. 8 and FIG. 9 and located just below the mechanical sieve screens 33.
  • the jetting stream will have a reduced degree of interference with the sieve screens.
  • These locations may, for example, be more desirable for filter applications where there are space constraints or based on the settling of the contaminants in the filter media .
  • a benefit of these arrangements can be that "blind-spots" are minimized since the vertical movement of the jetting stream is not impeded by contact with the sieve screen members as may occur in other embodiments shown. It will be appreciated that multiple elevations may be used in a single application and that the invention is not limited to these locations or elevations.
  • each filter chamber may contain a process inlet nozzle 82 and a process outlet nozzle 81.
  • a plurality of piping conduits may connected to these inlet and outlet connections so that the process fluid may flow into each chamber in parallel.
  • a large fluid processing volume is allowed without requiring a large number of radial nozzles to be installed to ensure adequate jetting coverage as might be required if the filtration were carried out in a single large filter vessel.
  • the piping conduits connecting the chambers may be done so that the fluid to be filtered flows through each chamber in a series manner.
  • Such a flow pattern may be advantageous where each chamber contains a different media type that has a unique affinity for a particular fluid contaminant or particle size.
  • the amount of jetting stream required to break-up and mobilize the contaminants during the cleaning cycle may be varied independently to each chamber to optimize the cleaning cycle.
  • the jetting stream flowing to the radial nozzles inside the filter housing may be comprised of a pre-mixed stream of a compressed gas and liquid flowing to each nozzle from a common header.
  • a source of a pressurized gas and pressurized liquid Connected to this common header is a source of a pressurized gas and pressurized liquid.
  • Each of these streams may flow into the common distribution header through a control element and metering device such that the filter operator can adjust the rate of gas and liquid flowing to the nozzles.
  • Typical gas source is natural gas. However, any inert gas would be applicable.
  • the liquid source typically used by the inventors is the incoming contaminated process fluid.
  • the amount of liquid and gas flowing into the common header may largely be dependent on the overall size of the filter housing. It has been observed that approximately 9 gpm (gallons per minute) of water per square foot of bed area and 0.7 SCFM (standard cubic feet per minute) of gas per cubic foot of bed provide adequate performance for cleaning black walnut shells filtering oil and solids from produced water. Converting these values to a common volumetric unit gives a typical value of 1.7 cubic feet of liquid per square feet of bed area per standard cubic feet of gas per cubic feet of filter media inside the housing. This ratio will vary to some extent based on the size of the vessel, the number of radial nozzles used, the size and volume of filter media being cleaned, and the physical characteristics of the contaminants. Therefore, it is understood that part of the operation of this type of filter is adjusting the liquid and gas stream rates to optimize the media cleaning cycle performance while minimizing the amount of contaminated liquid remaining for disposal or recycling.
  • FIGS. 12 and 13 shows additional illustrative embodiments of non-fixed media filter vessels 200 and 202, respectively, with various optional layouts of the radial nozzles 40 for inputting a jetting stream for cleaning the media, for example in a backwash cleaning cycle.
  • FIGS. 12 and 13 simply show various optional positioning of the radial nozzles 40 in examples of filter vessels and are for the purpose of illustrating that a plurality of filter vessels, housings, architectures and/or headers may be implemented.
  • FIG. 12 shows a vertical non-fixed media filter vessel 200 while Fig. 13 shows a horizontal non-fixed media filter vessel 202.
  • the radial nozzles 40 may be nozzles such as those described herein, for example with reference to FIGS. 2-7.

Abstract

L'invention porte sur une buse destinée à être utilisée à l'intérieur d'un filtre pour faire entrer un flux injecté dans le matériau filtrant pour nettoyer le matériau filtrant. La buse comprend une entrée pour la communication avec une source de flux injecté et une pluralité de plaques empilées parallèlement et en butée les unes avec les autres. La pluralité de plaques comprennent au moins une plaque supérieure et une plaque inférieure, l'une des plaques ayant une ouverture passant dans son centre pour la réception du flux injecté, au moins un espace étant ménagé entre des plaques adjacentes, l'espace s'étendant du bord extérieur des plaques vers l'intérieur des plaques et étant en communication fluidique avec l'ouverture pour la canalisation du flux injecté, radialement vers l'extérieur à partir du plan longitudinal des plaques et pratiquement parallèlement à ce dernier.
PCT/CA2015/050450 2015-05-19 2015-05-19 Buse de lavage de filtre à contre-courant WO2016183657A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CA2015/050450 WO2016183657A1 (fr) 2015-05-19 2015-05-19 Buse de lavage de filtre à contre-courant

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Application Number Priority Date Filing Date Title
PCT/CA2015/050450 WO2016183657A1 (fr) 2015-05-19 2015-05-19 Buse de lavage de filtre à contre-courant

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515314A (en) * 1981-11-03 1985-05-07 Plessey Overseas Limited Liquid spray apparatus
US5100550A (en) * 1988-11-02 1992-03-31 Walter Furrer Filter nozzle with annular filter discs
RU2058178C1 (ru) * 1990-12-25 1996-04-20 Свердловский научно-исследовательский институт химического машиностроения Щелевой колпачок для фильтров с зернистой загрузкой
RU2254899C1 (ru) * 2004-02-03 2005-06-27 Иванюк Виктор Николаевич Фильтрующий колпачок
CA2689047A1 (fr) * 2007-02-09 2008-08-21 Exterran Holdings, Inc. Procede et dispositif pour nettoyer des milieux filtrants non fixes
WO2013045091A1 (fr) * 2011-10-01 2013-04-04 Daimler Ag Filtre comportant un empilement d'éléments filtrants
WO2013183285A1 (fr) * 2012-06-04 2013-12-12 株式会社エンプラス Filtre à disque et disque à filtre utilisé pour celui-ci

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515314A (en) * 1981-11-03 1985-05-07 Plessey Overseas Limited Liquid spray apparatus
US5100550A (en) * 1988-11-02 1992-03-31 Walter Furrer Filter nozzle with annular filter discs
RU2058178C1 (ru) * 1990-12-25 1996-04-20 Свердловский научно-исследовательский институт химического машиностроения Щелевой колпачок для фильтров с зернистой загрузкой
RU2254899C1 (ru) * 2004-02-03 2005-06-27 Иванюк Виктор Николаевич Фильтрующий колпачок
CA2689047A1 (fr) * 2007-02-09 2008-08-21 Exterran Holdings, Inc. Procede et dispositif pour nettoyer des milieux filtrants non fixes
WO2013045091A1 (fr) * 2011-10-01 2013-04-04 Daimler Ag Filtre comportant un empilement d'éléments filtrants
WO2013183285A1 (fr) * 2012-06-04 2013-12-12 株式会社エンプラス Filtre à disque et disque à filtre utilisé pour celui-ci

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