EP2633918B1 - Centrifugeuse à poussoir et procédé de fonctionnement d'une centrifugeuse à poussoir - Google Patents

Centrifugeuse à poussoir et procédé de fonctionnement d'une centrifugeuse à poussoir Download PDF

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Publication number
EP2633918B1
EP2633918B1 EP13155983.3A EP13155983A EP2633918B1 EP 2633918 B1 EP2633918 B1 EP 2633918B1 EP 13155983 A EP13155983 A EP 13155983A EP 2633918 B1 EP2633918 B1 EP 2633918B1
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EP
European Patent Office
Prior art keywords
filter drum
drum body
filter
circumferential surface
inner circumferential
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Application number
EP13155983.3A
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German (de)
English (en)
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EP2633918A2 (fr
EP2633918A3 (fr
Inventor
Peter Schmidt
Bruno Hegnauer
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Andritz KMPT GmbH
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Andritz KMPT GmbH
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Publication of EP2633918A2 publication Critical patent/EP2633918A2/fr
Publication of EP2633918A3 publication Critical patent/EP2633918A3/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/18—Rotary bowls formed or coated with sieving or filtering elements

Definitions

  • the invention relates to a pusher centrifuge and a method for operating a pusher centrifuge in filter operation.
  • pusher centrifuges for example, there is an attempt to increase the solids content in the material to be filtered, which is, for example, a suspension from which the solid contained therein is to be filtered / separated, before a main filtration, thereby increasing the efficiency of the pusher centrifuge.
  • EP 1 468 742 A1 From the EP 1 468 742 A1 .
  • EP 1 468 743 A1 and DE 1 079 551 A It is known to direct a filling distributor, via which material to be filtered is passed into a filter drum of a pusher centrifuge, directly downstream of a conical filter drum.
  • a pusher centrifuge according to the preamble of claim 1 is made CH 312 160 known.
  • a pusher centrifuge comprising a filter drum having a longitudinal axis about which the filter drum is rotatable, a first drum body having an inner peripheral surface defined by a first filter means and an outer peripheral surface between which a drainage gap is formed and a second filter drum Filter drum body, the an inner peripheral surface defined by a second filter means and an outer peripheral surface, and a sliding bottom disposed in the filter drum, the first filter drum body being disposed radially adjacent to the sliding bottom, and wherein the sliding bottom and the second filter drum body are in common and the first filter drum body in the direction of
  • the longitudinal axis of the filter drum by means of a relative movement mechanism relative to each other axially reciprocally movable (to thereby eg on the inner peripheral surface of the first filter drum body adhering to be filtered material in the direction of the longitudinal axis of the filter drum (forward) on the inner peripheral surface of the second filter
  • the sliding floor as a rule extends transversely across the longitudinal axis of the filter drum acting as the axis of rotation.
  • the outer circumferential surface and / or the outer circumferential wall of the first filter drum body generally extend substantially concentric with the longitudinal axis.
  • the inner circumferential surface of the first filter drum body typically extends (also) parallel (and for example concentric) to the longitudinal axis of the filter drum and thus substantially parallel to the outer circumferential surface of the first drum body.
  • the inner diameter of the first filter drum body is smaller than the inner diameter of the second filter drum body, wherein due to the substantially parallel to the longitudinal axis of the filter drum configured outer peripheral surface of the first filter drum body or due to the substantially parallel to the longitudinal axis of the filter drum extending, radially outer inner boundary surface of the drainage gap the first filter drum body with a radially flat-walled or radially thin-walled outer peripheral wall can be produced, whereby the radial distance between the inner peripheral surface of the first filter drum body and the inner peripheral surface of the second filter drum body can be kept small.
  • a radial step or a radial step between the inner circumferential surface of the first filter drum body and the inner peripheral surface of the second filter drum body can be kept small, or the difference between the inner diameter of the first filter drum body and the inner diameter of the second filter drum body can be made small.
  • the first filter drum body which is upstream of the second filter drum body in the material flow of a material to be filtered introduced into the filter drum, e.g. is immediately upstream, thus forming a pre-filtration stage or pre-main filtration stage with an available for filtration inner peripheral surface per axial length (in the direction of the longitudinal axis of the filter drum), which is approximately equal to or slightly smaller than that (further) to ( Main) filtration available per inner circumferential surface (in the direction of the longitudinal axis of the filter drum) of the second filter drum body.
  • the first and second filter means may e.g. Sieves, such as Bar screens that are composed of mutually parallel and spaced in the circumferential direction of the filter drum spaced bars.
  • the filter means may e.g. be mesh and / or mesh screens or be designed in the form of any other suitable filter screen.
  • the first and second filter means may be structurally identical or may be different filter media.
  • the filtration regions are essentially formed by those regions or portions of the inner circumferential surface of the first and second filter drum bodies which are periodically spaced during relative reciprocation substantially completely freed of material adhering thereto (on the inner circumferential surface) by means of the sliding bottom (with respect to the inner circumferential surface of the first filter drum body) and the first filter drum body (with respect to the inner circumferential surface of the second filter drum body, respectively) become.
  • the pusher bottom is displaced from material adhering (to be filtered) adhered to the inner peripheral surface of the first drum body up to at least the axial center or eg at least two-thirds or at least 75% or at least 80% or at least 85% or Up to at least 90% or at least up to 95% or up to 100% of the axial extent of the first filter means (and thus the axial extent of the defined by the first filter means inner peripheral surface of the first filter drum body) is axially relatively movable or axially relatively moved, can be achieved be that the defined by the first filter means inner peripheral surface of the first filter drum body is periodically substantially completely freed from it adhering (to be filtered) material, without risk of channeling.
  • the push floor may move in the course of its relative movement relative to the first filter drum body, for example from a rear turning point, in which there is a maximum inner circumferential surface of the first drum body prior to the moving floor for receiving material to be filtered, to be movable relative to a forward turning point, where the walking floor is at least half of the axial extent of the first first filter means is moved axially relative.
  • the rearward reversal point of the push floor may be located adjacent to a corresponding rear axial end portion of the first filter means.
  • the rear reversal point can also be arranged further forward, for example, already at the axial center of the axial extension of the first Filter means (or even further forward), wherein the front reversal point is then arranged correspondingly further forward toward the front (from the push floor facing away) end of the first filter drum body and the push floor accordingly over half of the axial extent of the first filter means addition, for example, to at least to two-thirds, or at least 75%, or at least 80%, or at least 85%, or at least 90%, or at least 95%, or up to 100% of the axial extent of the first filter means.
  • the relative movement mechanism is, for example, designed and / or set up such that at least half or at least two-thirds or at least 75% or at least 80% or at least 85% or at least 90% of the moving floor in the context of its relative reciprocating movement or at least 95% or 100% of the maximum axial extent of the first filter medium present in front of the sliding floor (or present before the rear reversal point) can be painted over axially or passed over axially.
  • the maximum axial extent of the (first) filter means present in front of the sliding floor defines, for example, the effective area of the first filter drum body available for filtering, so that the relative movement mechanism is designed and / or set up, for example, by the sliding floor in the context of its relative back and forth -Her movement at least half or eg at least two-thirds or at least 75% or at least 80% or at least 85% or at least 90% or at least 95% or 100% of this useful surface are overspread or be painted over.
  • the relative movement mechanism may be formed such that the first filter drum body is at or around the entire axial length of its first filter means (and thus with the (or around) the total axial length of its inner circumferential surface).
  • substantially only a filtration region and at the second filter drum body both a filtration region (in the axial portion of the inner circumferential surface of the second filter drum body between the first filter drum body and approximately at that point to which the first filter drum body maximally over the inner circumferential surface the second filter drum body is axially relatively moved) and a dehumidifying area (in the axial end portion of the inner circumferential surface of the second drum body between the front (from Sliding bottom facing away) axial end of the second filter drum body and approximately (the above) that point to which the first filter drum body axially relative to the inner peripheral surface of the second filter drum body is relatively relatively moved or relativbewegbar).
  • the dewatering area on the second filter drum body is at least as large as the filtration area on the second filter drum body and / or if, for example, the area size of the axial end portion of the inner circumferential surface of the second filter drum body is between front (away from the thrust floor) axial end of the second filter drum body and in about (the above) that point to which the first filter drum body axially over the inner peripheral surface of the second filter drum body axially (forward) relatively moved or is relatively movable, at least as large such as the area size of the maximum upstream of the sliding floor portion of the defined by the first filter means inner peripheral surface of the first filter drum body and / or if the axial extent of the axial end portion of the inner peripheral surface of the second filter rtrommel stressess between the front (away from the sliding bottom) axial end of the second filter drum body and in about (the above) that point to which the first filter drum body axially over the inner peripheral surface
  • the relative movement mechanism is e.g. such that the first filter drum body is relatively movable with the entire axial length of its first filter means via the inner circumferential surface of the second filter drum body defined by the second filter means, wherein an axial end portion of the inner peripheral surface of the second filter drum body is not recoatable (from the first filter drum body) in front of the first filter drum body or overpainted.
  • the axial end portion of the second filter drum body defined by the second filter means, which is not overpainted by the first filter drum body has e.g. an area larger or larger than the inner peripheral surface of the first drum body defined by the first filter means, or has e.g. an axial extent equal to or greater than the axial extent of the defined by the first filter means inner peripheral surface.
  • the relative movement mechanism is designed, for example, such that the first filter drum body can sweep or cover the inner circumferential surface of the second filter drum body axially only to the extent that the first filter drum body faces away from the sliding bottom and the front end of the second filter drum body faces away from the push floor remaining end portion defined by the second filter means inner peripheral surface of the second filter drum body, which end portion is not axially painted over from the filter drum body / is swept, has an axial extent equal to or greater than the axial extent of the present before the push floor portion of the first filter means defined inner circumferential surface of the first filter drum body and / or equal to or greater than the axial extent of the inner circumferential surface of the first filter drum body and / or that the between the first filter drum body and a remote from the sliding bottom front end of the second filter drum body end portion of the second filter means defined inner peripheral surface of the second filter drum body, which end portion is not axially painted over by the filter drum body, a Has area size that is equal to or greater than the area size of the maximum present
  • the filter surface available as a whole of the (main) filtration is considerably increased, eg substantially doubled, whereby the filter efficiency is correspondingly increased, the filter conditions being on both the inner circumferential surface of the first filter drum body and that of the filtration Available portion of the inner peripheral surface of the second filter drum body are substantially equal.
  • the operation volume and / or mass flow rate of the material to be filtered, stroke length and optional speed of the filter drum and optional frequency of the reciprocating motion
  • the operation to provide such that on the inner peripheral surface of the first filter drum body separating filter cake or the material there has a same or barely smaller radial distance from the longitudinal axis of the filter drum as or as the on the inner peripheral surface of the second filter drum body separating material or as which there filtering filter cake, where, for example, a liquid present thereon of the material to be filtered, for example a suspension, still above (radially inside) both filter cake (filter cake on the inner peripheral surface of the first filter drum body and filter cake on a first filter drum body facing the beginning portion of the inner circumferential surface of the second filter drum body ), whereby for the inner peripheral surface of the first filter drum body and the filtration available portion of the inner peripheral surface of the second drum body filter can be achieved in this respect approximately equal filter conditions
  • the push floor sweeps the inner peripheral surface of the first drum body to thereby push the material to be filtered adhered to the inner circumferential surface of the second drum body, and the first drum body sweeps the inner peripheral surface of the second drum body around the filter adhered there (in the overlined portion)
  • the (main) filtration of the material to be filtered usually takes place on that filter drum body which is closest to a feeder which feeds material to be filtered into the filter drum in the material flow, and also substantially only at that portion this filter drum body whose inner peripheral surface is cleared of the sliding bottom in periodically spaced by the relative reciprocating motion of the material to be filtered adhering thereto.
  • the (main) filtration can take place both on the inner circumferential surface of the first filter drum body and on the portion of the inner circumferential surface of the second filter drum body swept by the first filter drum body because the first drum body is substantially complete can be freed from adhering to filtering material.
  • the moving floor is at least 50% can sweep the inner peripheral surface of the first filter drum body, wherein by means of a sufficiently high throughput of material to be filtered, the remaining 50% of the inner circumferential surface can be substantially flushed free without risk of channel formation.
  • the filtration area in the pusher centrifuge according to the invention is considerably increased and is composed, for example, of a pre-filtration area formed by the inner circumferential surface of the first filter drum body and a main filtration area formed by a first axial section (the moving floor closer axial section) of the inner peripheral surface of the second filter drum body.
  • the first and second filter drum bodies are respectively provided on their inner circumferential surface with the first and second filter means and the first and second filter media, such as a screen such as a slotted screen, and the first and second filter drum bodies have, for example, a radially perforated or perforated filter ., Provided with radial passage openings peripheral wall, through which Filtering agent / filter medium passing liquid can pass radially outward, to be discharged from there away from the filter drum.
  • the respective filter medium / filter medium may be a separate component which is releasably attached to the respective filter drum body.
  • the respective filter medium / filter medium can also be an integral part of the respective filter drum body.
  • the respective filter drum body may comprise an integrally formed cylindrical drum body portion having an outer peripheral wall integral therewith or formed as an integral cylindrical drum body.
  • the respective filter drum body can also be made of assembled individual components, such as two at an axial distance (in the longitudinal direction of the filter drum) spaced holding rings with interposed sieve bars are formed, which are arranged with their longitudinal direction in the longitudinal direction of the filter drum and along the circumference of the filter drum body in Circumferentially spaced from each other and form, for example, an outer peripheral wall of the respective filter drum body from which the outer peripheral surface of the respective filter drum body is formed.
  • the drainage gap of the first filter drum body is e.g. formed between the first filter means / filter medium and an outer peripheral wall of the first filter drum body.
  • a drainage gap may be formed which has a structure corresponding to the drainage gap of the first filter drum body.
  • the first filter drum body may have an integral outer peripheral wall which radially outwardly the outer surface of the first filter drum body defined and in which radially extending through holes or through holes are formed.
  • the first filter drum body may comprise a plurality of elongated rods (eg, screen bars) disposed along the circumference of the first filter drum body and extending with its longitudinal direction in the direction of the longitudinal axis of the filter drum, and may comprise a first and a second retaining ring, wherein the rods arranged in the longitudinal direction between the first and the second retaining ring and secured to the retaining rings, and wherein the radial outer sides of the rods together define the outer peripheral surface of the first drum body.
  • elongated rods eg, screen bars
  • the drainage gap may be bounded, in radial direction with respect to the filter drum, by radially opposed inner boundary surfaces that are substantially parallel to one another, optionally with the radial distance between the two inner boundary surfaces less than or equal to 30 mm. less than or equal to 25mm or e.g. less than or equal to 20 mm, e.g. less than or equal to 15mm or e.g. less than or equal to 10mm, e.g. less than or equal to 5mm, e.g. is less than 2mm.
  • the outer peripheral surface of the first filter drum body is formed, for example, in a substantially rectilinear manner in the cross-section taken through the longitudinal axis of the filter drum. The same also applies, for example, to the inner circumferential surface of the first filter drum body and to the respective inner boundary surface of the drainage gap.
  • the respective inner boundary surface also extends, for example, substantially parallel to the longitudinal axis of the filter drum.
  • the screen bars and retaining rings of the respective (e.g., the first) filter drum body holding them can be radially outwardly, e.g. there is a shoulder, which, however, does not prevent the outer peripheral surface of the first drum body, e.g. (Largely) is formed by the substantially rectilinear and parallel to the longitudinal axis extending screen bars, substantially or substantially straight and extends parallel to the longitudinal axis of the filter drum.
  • the retaining rings may e.g. be welded directly to the screen bars, and / or the retaining rings can also be axially connected to each other by radially outside the screen bars axially extending bolts.
  • the outer circumferential surface of the first drum body becomes e.g. still essentially formed by the outer surfaces of the screen bars.
  • the outer circumferential surface of the first drum body may be formed (largely) by the radially outer surfaces of the bolts.
  • the first filter drum body may e.g. also be one piece.
  • the retaining rings and the screen bars may be in one piece, e.g. be worked by laser cutting or by other Materialabtragungsart from a single piece of material.
  • substantially parallel to the longitudinal axis of the filter drum covers, for example, the meaning “parallel”, with which certain customary tolerances are included, and / or the meaning the further smaller angle of, for example, less than or equal to 15 ° or smaller than or equal to 10 ° or smaller eg equal to 5 ° or smaller eg equal to 3 ° or smaller eg equal to 2 ° or smaller eg equal to 1 ° are detected.
  • substantially rectilinear includes the meaning “straight-line within normal tolerances” and / or “mostly straight-line” (ie, a single paragraph (such as those discussed above for the retaining rings and the mesh bars) for straightness do not exclude.
  • the inner peripheral surface and the outer peripheral surface of the first filter drum body and, if applicable, the respective inner boundary surface of the drainage gap extend, e.g. essentially parallel to each other.
  • the outer peripheral surface and optionally the respective inner boundary surface of the drainage gap extend, for example. parallel to the longitudinal axis of the filter drum and / or parallel to each other.
  • the pusher centrifuge further includes, for example, a feeder for feeding material to be filtered (eg, suspension) into the filter drum, the feeder having a filler manifold disposed inside the filter drum and having an outlet formed and oriented such that the material to be filtered is discharged obliquely from the outlet with respect to the longitudinal axis of the filter drum in the direction of the sliding floor and radially outwards onto the inner peripheral surface of the first filter drum body.
  • a feeder for feeding material to be filtered (eg, suspension) into the filter drum, the feeder having a filler manifold disposed inside the filter drum and having an outlet formed and oriented such that the material to be filtered is discharged obliquely from the outlet with respect to the longitudinal axis of the filter drum in the direction of the sliding floor and radially outwards onto the inner peripheral surface of the first filter drum body.
  • the second filter drum body is seen in the direction of the longitudinal axis of the filter drum, e.g. more than twice as long as the first filter drum body. It can thus be achieved that, even if the first filter drum body with its entire axial length (viewed in the longitudinal direction of the filter drum) axially overstretches the inner circumferential surface of the second filter drum body, an axial end portion of the inner peripheral surface of the second filter drum body is not overstretched, so that at this axial end portion the inner circumferential surface of the filter drum body can form a filter cake, whereby the axial end portion of the second filter drum body forms a (first) dehumidifying region for further dehumidifying the filter cake (from solid material of the material to be filtered).
  • the radial distance between the outer circumferential surface and the inner circumferential surface of the first filter drum body is e.g. less than or equal to 70mm or e.g. less than or equal to 60mm or e.g. less than or equal to 50mm, less than or equal to 40mm, e.g. less than or equal to 30mm or e.g. less than or equal to 20mm or e.g. less than or equal to 10mm, e.g. less than 5mm
  • the radial distance between the inner circumferential surface of the first filter drum body and the inner peripheral surface of the second filter drum body is e.g. less than 70mm or e.g. less than or equal to 60mm or e.g. less than or equal to 50mm, e.g. less than or equal to 40mm, e.g. less than or equal to 30mm or e.g. less than or equal to 20mm or e.g. less than or equal to 10mm, e.g. less than 5mm
  • the pusher centrifuge quasi a single-stage pusher centrifuge with eg formed by the second filter drum body main filtration and dehumidifying and formed by the first filter drum body pre-filtration stage.
  • the pusher centrifuge can also have one or more additional stages and thus one or more additional filter drum body, which downstream of the second filter drum body and of which the material is further dehumidified or dried.
  • the filter drum of the pusher centrifuge e.g. a third filter drum body having an inner peripheral surface (and an outer peripheral surface) downstream of the second filter drum body, wherein the relative movement mechanism is formed such that the relative movement mechanism of the moving floor and the second filter drum body together and the first and third filter drum body together in the direction of the longitudinal axis the filter drum being axially reciprocable relative to each other to thereby push material adhering to the inner peripheral surface of the second drum body toward the inner peripheral surface of the third drum body and the inner peripheral surface of the third drum body toward a solids discharge passage in the direction of the longitudinal axis of the filter drum.
  • the pusher bottom may be axially reciprocable together with the second filter drum body, and the first filter drum body may be axially fixed, or vice versa.
  • the pusher floor together with the second filter drum body can be moved axially back and forth, and the first Filtertrommelköper and the third filter drum body may be axially fixed, or vice versa.
  • the available for filtration inner peripheral surface of the filter drum which is e.g. composed of the sum of the area size of the portion of the inner peripheral surface of the first filter drum body present in front of (in the direction of the longitudinal axis of the filter drum to the material Ausschiebe- or Aus specialcardi) and the surface area of the present in front of the first filter drum body portion of the inner peripheral surface of the second filter drum body
  • the first filter drum body can sweep the second filter drum body axially farthest or over (per stroke) not (or never) less than e.g. 75% or 80% or 85% or 90% of the maximum size of this filter drum inner circumferential surface available for filtration.
  • a method of operating a pusher centrifuge in filter operation comprising a filter drum having a longitudinal axis about which the filter drum is rotatable, a first filter drum body having an inner circumferential surface defined by a first filter means, and a second filter drum body comprising an inner circumferential surface defined by a second filter means, a pusher tray disposed in the filter drum, the first filter drum body being radially adjacent to the pusher tray, and a relative movement mechanism, of which the pusher tray and the second filter drum body are common and the first Filter drum body in the direction of the longitudinal axis of the filter drum by a stroke length and with a stroke frequency relative to each other are axially reciprocally movable to thereby slide on the inner peripheral surface of the first filter drum body, to be filtered material in the direction of the longitudinal axis of the filter drum on the inner peripheral surface of the second filter drum body
  • a pusher centrifuge as described herein, wherein
  • the relative movement mechanism can be adjusted to such a stroke length and / or controlled that seen from the sliding floor in the direction of the longitudinal axis of the filter drum, in each case at least 50% or at least 60% or eg at least two-thirds or eg at least three quarters or eg at least 80% or eg at least 85% or eg at least 90% of the (defined by the first filter means) inner peripheral surface of the first filter drum body are swept from the sliding floor.
  • the relative movement mechanism may e.g. is adjusted to such a stroke length and / or controlled that is of the first filter drum body defined by the second filter means inner peripheral surface of the second filter drum body only axially overlapped so far that the remaining before the first filter body not swept (from the first filter drum body) surface portion of the inner peripheral surface of the second filter drum body is equal to or greater than the maximum present before the sliding floor surface portion of the first filter means formed inner peripheral surface of the first filter drum body.
  • the invention further provides a method for operating a pusher centrifuge in filter operation, the pusher centrifuge comprising a filter drum having a longitudinal axis about which the filter drum is rotatable, a first filter drum body having an inner peripheral surface defined by a first filter means, and a second filter drum body.
  • the first filter drum body 7 has a first filter medium or first filter means 33 in the form of a screen, from which the inner peripheral surface 9 of the first filter drum body 7 is defined or formed.
  • the first filter drum body 7 further has an outer peripheral wall 35, here an integral outer peripheral wall, from which the outer peripheral surface 11 of the first filter drum body 7 is defined, wherein between the outer peripheral wall 35 and the first filter means 33, a drainage gap 37 is formed (the drainage gap FIG. 37 is shown with an excessively large radial dimension for clarity) defined by a radially outer inner boundary surface 39 defined by the outer peripheral wall 35 and a radially inner inner boundary surface 41 defined by the first filter element 33 is, limited or defined radially.
  • the inner peripheral surface 9, the radially outer inner boundary surface 41 and the radially inner inner boundary surface 39 of the first filter drum body 7 also extend parallel to the longitudinal axis 5 of Filter drum 3 and parallel to each other and parallel to the outer peripheral surface 11 of the first filter drum body 7th
  • the second filter drum body 13 has a second filter medium or filter means 47, e.g. a screen, which defines the inner circumferential surface 15 of the second filter drum body 13.
  • the second filter drum body 13 further has an outer peripheral wall 49, here an integral outer peripheral wall, in which radially through-holes 51 are formed. Between the outer peripheral wall 49 and the second filter means 47, a drainage gap 53 is formed (the drainage gap 53 is shown with an excessively large radial dimension for clarity) defined by a radially outer inner boundary surface 55 defined by the outer peripheral wall 49 and a radially inner inner boundary surface 57 defined by the second filter means 47 is radially defined.
  • the outer peripheral surface 17, the inner peripheral surface 15, the radially outer inner boundary surface 55 and the radially inner inner boundary surface 57 of the second filter drum body 13 also extend parallel to the longitudinal axis 5 of the filter drum 3 and parallel to each other.
  • the third filter drum body 19 has a third filter medium or third filter means 59, eg a sieve, which defines or forms the inner peripheral surface 21 of the third filter drum body 19.
  • the third Filter drum body 19 further has an outer peripheral wall 61, here an integral outer peripheral wall, in which radially through-holes 62 are formed. Between the outer peripheral wall 61 and the third filter means 59, a drainage gap 63 is formed (the drainage gap 63 is shown with an excessively large radial dimension for clarity) defined by a radially outer inner boundary surface 65 defined by the outer peripheral wall 61 and a radially inner inner boundary surface 67 defined by the filter means 59 is radially defined.
  • the outer peripheral surface 21, the inner peripheral surface 23, the radially outer inner boundary surface 65 and the radially inner inner boundary surface 67 of the third filter drum body 19 also extend parallel to the longitudinal axis 5 of the filter drum 3 and parallel to each other.
  • the pusher centrifuge 1 further comprises a feed device 69 for feeding material 71 to be filtered, which is for example a suspension, into the filter drum 3 and which comprises: a supply line 73 leading into the filter drum 3 outside the filter drum 3 and a filling distributor device 75 having a Outlet 77, from which via the outlet 77, the supplied from the feeder to be filtered material 71 is discharged into the filter drum 3.
  • the Greverteilervoriques 75 is formed in the context of the back-and-forth movement of the sliding floor 25 axially with the sliding floor 25 back and forth with movable.
  • the outlet 77 is designed and aligned in such a way that the material 71 to be filtered is output from the outlet 77 with respect to the longitudinal axis 5 of the filter drum 3 obliquely in the direction of the sliding floor 25 and radially outwards onto the inner peripheral surface 9 of the first filter drum body 7.
  • the pusher centrifuge 1 has a solids discharge line 81, via which the solid material 83 filtered out of the material 71 to be filtered is removed from the pusher centrifuge 1.
  • the filter drum 3 is attached to a drive shaft 87 which is driven by a rotary drive 89, e.g. an electric motor, is driven in rotation.
  • the axial drive device 29 is e.g. a pneumatically or hydraulically or electrically operating device.
  • the rotary drive 89 and the axial drive device 29 are controlled by an electronic control unit, not shown, for controlling the rotational speed or the axial stroke frequency and / or the axial stroke size.
  • the control unit can also be connected to the feed device in order to control the flow / throughput of the material to be filtered fed to the filter drum 3.
  • the filter drum 3 is further accommodated in a housing 89.
  • the material 71 to be filtered discharged via the filling distributor device 69 into the filter drum 3 first reaches the front side of the sliding floor 25 and the inner peripheral surface 9 of the first filter drum body 7, which is immediately downstream of the filling distributor device 69. Due to the parallel to the longitudinal axis The filter drum 3 extending inner peripheral surface 9 is applied to the material thereon 71 (due to the rotation of the filter drum 3) an already large centrifugal force, so that the material 71 liquid is already efficiently withdrawn and the material 71 is effectively thickened.
  • the material 71 is pushed in the stroke frequency of the relative movement between the sliding floor 25 and the first filter drum body 7 certain time intervals on the inner peripheral surface 15 of the second filter drum body 13, and in the context of the constant axial reciprocating movement of the first filter drum body 7 relative to the second filter drum body 13, the material 71 is determined by the stroke frequency of the relative movement between the first filter drum body 7 and the second filter drum body 13 time intervals on the inner surface 23 of the third filter drum body 19 pushed, and in the context of the constant axial reciprocating movement of the second filter drum body 13 relative to the third filter drum body 19 is ultimately from the material to be filtered 71 remaining solid material 83 in from the stroke frequency of the relative movement between hen the second filter drum body 13 and the third filter drum body 19 certain time intervals pushed to the solids discharge line 81 out.
  • the actual filtration or main filtration are available here in front of the sliding bottom 25 lying axial portion of the inner peripheral surface 9 of the first filter drum body 7 and that axial (in the direction of the longitudinal axis 5) (start) portion 97 of the inner peripheral surface 15 of the second filter drum body 13, which extends from (immediately) in front of the first filter drum body 7 up to that axial point 100 extends, to which the first filter drum body 7 relative to the second filter drum body 13 in its stroke can reach maximum forward, so that the axial initial portion 97 of the inner peripheral surface 15 of the second filter drum body 7 at periodic intervals substantially completely adhering thereto Material is released.
  • That axial end portion 98 of the inner circumferential surface 15 of the second filter drum body 13 extending from the aforementioned axial location 100 to the front axial end 102 (which is then followed by the inner peripheral surface 21 of the third filter drum body 19) of the second filter drum body 13 constitutes (FIG. first) dehumidifying area, where in filter operation there is always a filter cake, which is periodically moved on sections of the inner peripheral surface 21 of the third filter drum body 19, which inner peripheral surface 21 forms a further dehumidification area.
  • the in the FIGS. 1 and 2 illustrated pusher centrifuge 1 thus represents in principle a combination of a conventional two-stage pusher centrifuge, the two conventional stages are formed by the second and third filter drum body 13, 19, with a pre-filtration stage, which of the between the two conventional stages and the feeder 69th switched first filter drum body 7 is formed.
  • the axial extension or length (in the direction of the longitudinal axis 5) of the second filter means 47 or the inner circumferential surface 15 defined by the second filter means 47 is more than twice the axial extension or length of the first filter means 33 or defined by the first filter means 33 Inner peripheral surface of the first filter drum body 7, so that, although the first filter drum body 7 by almost its entire axial length or about the entire axial extent of the first filter means 33 is moved relative to the second filter drum body 13 and sweeps the second filter means 47 by this extent / length, nor the above-mentioned axial end portion 98 of the inner peripheral surface 15 of the second filter drum body 9 remains on which permanently Can deposit filter cake and which is greater than the axial initial portion 97 of the inner peripheral surface 15 of the second filter drum body and as the inner peripheral surface 9 of the first filter drum body. 7
  • the pusher centrifuge 1 according to the Figures 3 and 4 is identical to the one in the FIGS. 1 and 2 Pusher centrifuge shown, with the only difference that in the Figures 3 and 4 illustrated pusher centrifuge 1 has no third filter drum body. Otherwise, in view of the structure and function of the pusher centrifuge according to Figures 3 and 4 to the above description of the pusher centrifuge 1 according to FIGS. 1 and 2 directed.
  • the material to be filtered 71 passes through the feed device 69 into the filter drum 3 and there first to the front of the sliding floor 25 and on the inner peripheral surface 9 of the first filter drum body 7. Due to the axial (in the direction of the longitudinal axis 5 of the filter drum 3) relative Hin- and-fro movement between the pusher tray 25 and the first filter drum body 7, the material 71 is pushed from the inner peripheral surface 9 of the first filter drum body 7 on the inner peripheral surface 15 of the second filter drum body 13, and due to the axial relative reciprocating motion between the First filter drum body 7 and the second filter drum body 13, the resulting from the material to be filtered 71 solid material 83 is pushed by the inner peripheral surface 15 of the second filter drum body 13 in the solids discharge line 81.
  • any optional additional measures are of the flat and thin-walled construction of the first filter drum body 7
  • the radially outer inner boundary surface 41 of the drainage gap 37 is aligned parallel to the longitudinal axis 5 of the filter drum 3 and - in cross section of the filter drum 3 through the longitudinal axis 5 seen the filter drum 3 - for example, is rectilinear and / or that the radially inner inner boundary surface 39 of the drainage gap 37 is aligned parallel to the longitudinal axis 5 of the filter drum 3 and - seen in cross section through the longitudinal axis 5 of the filter drum 3 - is formed, for example, rectilinear and / or that the inner peripheral surface 9 of the first filter drum body 7 is aligned parallel to the longitudinal axis 5 of the filter drum 3 and - seen in cross section of the filter drum 3 through the longitudinal axis 5 of
  • the axial extension / length (in the direction of the longitudinal axis 5) of the second filter means 47 of the second filter drum body 13 is more than twice the axial extension / length of the first filter means 33 of the first filter drum body 7, so that although the first filter drum body 7 around the entire Axial length of its first filter means 33 is relatively moved relative to the second filter drum body 13 via the inner peripheral surface 15, nor the above-mentioned large axial end portion 98 of the inner peripheral surface 15 of the second filter drum body 9 between that axial point 100, to the first filter drum body 7 relative to the second filter drum body 13 in its stroke after maximum can reach the front, and the front axial end 102 of the second filter drum body 13 remains on which can permanently deposit filter cake, so that this axial end portion 98 forms a dehumidifying area.
  • FIG. 5 an embodiment of a first filter drum body 7 is shown in passing through the longitudinal axis 5 cross-section.
  • the first filter drum body 7 has an integral drum-shaped body 104, which forms the outer peripheral wall 35 and the outer peripheral surface 11 thereon and which at both axial ends 106, 108 each have a radially inwardly extending, circumferential collar 110, 112.
  • Siebsticks 114 are arranged between the two peripheral collars 110, 112, which with their longitudinal direction in the direction of the longitudinal axis 5 of the filter drum 3 (see Figures 1-4 ), wherein the screen bars 114 are arranged at a circumferential distance from one another, so that in each case a screen gap 116 is formed between adjacent screen bars 114 (the screen gaps 116 are shown oversized).
  • a (imaginary) straight line G connecting the two axially and radially outermost ends 118, 120 of the first filter drum body 7 runs parallel to the longitudinal axis 5 of the filter drum 3, and the filter drum body 7 extends circumferentially (ie in the cross-sectional profile) with no section radially beyond this straight line outside.
  • the screen bars 114 forming the first filter means 33 further define the inner circumferential surface 9 of the first filter drum body 7.
  • FIG. 6 shows an embodiment of a first filter drum body 7 in a passing through the longitudinal axis 5 of the filter drum 3 cross-section.
  • the first filter drum body 7 at its axial ends 110, 112 respectively an extending in the circumferential direction of the first filter drum body 7 retaining ring 122, 124 and screen bars 114, which are arranged between the retaining rings 122, 124 and which are held by the retaining rings 122, 124.
  • the first filter drum body 7 has tethers 126, 128 extending along the outer periphery of the first drum body 7 in radial contact with the screen bars 114 around the first drum body 7 to radially support the screen bars 114.
  • the inner circumferential surface 9 of the first filter drum body 7 is formed by the screen bars 114 forming the first filter means 33.
  • the radially outer surface formed by the screen bars 114 may be considered the outer circumferential surface 11 of the first filter drum body 7.
  • the radially outer surface formed by the retaining rings 122, 124 and the screen bars 114 may be referred to as the outer peripheral surface 11 'of the first filter drum body 7 are considered.
  • a straight line G which connects the axially and radially outermost ends (end points) 118, 120 of the first filter drum body 7, extends substantially parallel to the longitudinal axis 5 of the filter drum 3, wherein (in the cross-sectional profile) no portion of the first filter drum body 7 radially extends outwardly beyond this straight line G.
  • FIG. 7 shows an embodiment of a first filter drum body 7 in a passing through the longitudinal axis 5 of the filter drum 3 cross-section.
  • the first filter drum body 7 at its axial ends 110, 112 respectively an extending in the circumferential direction of the first filter drum body 7 retaining ring 122, 124 and screen bars 114, which are arranged between the retaining rings 122, 124 and which are held by the retaining rings 122, 124.
  • the first filter drum body 7 holding bolts 130 which connect the two retaining rings 122, 124 together and which are arranged along the circumferential direction of the first filter drum body 7 at a distance from each other.
  • the radially outer surface formed by the screen bars 114 may be considered as the outer peripheral surface 11 of the first filter drum body 7.
  • the radial outer surface formed by the retaining rings 122, 124 and the screen bars 114 may be referred to as the outer peripheral surface 11 'of the first Filter drum body 7 are considered.
  • a straight line G which connects the axially and radially outermost ends (end points) 118, 120 of the first filter drum body 7, extends substantially parallel to the longitudinal axis 5 of the filter drum 3, wherein (in cross-sectional profile) no section of the first filter drum body 7 extends radially extends outwardly beyond this straight line G.
  • the screen bars 114 form the first filter means 33, which defines the inner circumferential surface 9 of the first filter drum body 7.
  • FIG. 8 shows an embodiment of a first filter drum body 7 in a passing through the longitudinal axis 5 of the filter drum 3 cross-section.
  • the first filter drum body 7 at its axial ends 110, 112 each one in the circumferential direction of the first filter drum body 7 extending retaining ring 122, 124 and screen bars 114, which are arranged between the retaining rings 122, 124 and which are held by the retaining rings 122, 124.
  • the screen bars 114 are, for example, welded directly to the retaining rings 122, 124 and form the outer peripheral surface 11 and the inner peripheral surface 9 of the first filter drum body 7, which circumferential surfaces 9, 11 are both arranged parallel to the longitudinal axis 5 of the filter drum and are seen in cross section of the filter drum body 7 rectilinear ,
  • the first filter drum body 7 may for example also be in one piece.
  • the retaining rings 122, 124 and the screen bars 114 may be made in one piece, for example, by laser cutting or by any other Materialabtragungsart be made of a single piece of material.
  • the retaining rings 122, 124 and the screen bars 114 may, for example, be welded together.

Landscapes

  • Centrifugal Separators (AREA)

Claims (10)

  1. Centrifugeuse à poussoir (1), comportant :
    un tambour de filtration (3) ayant un axe longitudinal (5) autour duquel le tambour de filtration (3) peut être tourné, un premier corps de tambour de filtration (7) comprenant une surface périphérique intérieure (9) formée par un premier moyen de filtration (33) et une surface périphérique extérieure (11), entre lesquels une fente de drainage (37) est formée, et un deuxième corps de tambour de filtration (13) comprenant une surface périphérique intérieure (15) formée par un deuxième moyen de filtration (47) et une surface périphérique extérieure (17),
    un fond de poussée (25) disposé dans le tambour de filtration (3), dans lequel le premier corps de tambour de filtration (7) est disposé radialement directement adjacent au fond de poussée (25),
    et un mécanisme de mouvement relatif (27) par lequel le fond de poussée (25) et le deuxième corps de tambour de filtration (13) ensemble et le premier corps de tambour de filtration (7) sont mobiles axialement en va-et-vient l'un par rapport à l'autre dans le sens de l'axe longitudinal (5) du tambour de filtration (3), dans lequel
    la fente de drainage (37) est délimitée radialement vers l'extérieur par une surface de délimitation intérieure (41) dans un sens radial par rapport au tambour de filtration (3), qui s'étend sensiblement en parallèle à l'axe longitudinal (5) du tambour de filtration (3),
    caractérisée en ce que, vu dans le sens de l'axe longitudinal (5), le deuxième moyen de filtration (47) a une étendue axiale qui est supérieure à l'étendue axiale du premier moyen de filtration (33), où le mécanisme de mouvement relatif (27) est formé de telle sorte que le fond de poussée (25) soit mobile relativement de manière axiale au moins jusqu'à la moitié de l'étendue axiale du premier moyen de filtration (33) dans le cadre du mouvement relatif de va-et-vient en déplaçant axialement un matériau adhérant à la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) .
  2. Centrifugeuse à poussoir (1) selon la revendication 1, dans laquelle la fente de drainage (37) est délimitée par des surfaces de délimitation intérieures (39, 41) radialement opposées l'une à l'autre dans un sens radial par rapport au tambour de filtration (3), qui s'étendent de manière sensiblement parallèle l'une à l'autre, la distance radiale entre les deux surfaces de délimitation intérieures (39, 41) étant optionnellement inférieure ou égale à 30 mm.
  3. Centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 2, dans laquelle le mécanisme de mouvement relatif (27) est configuré de telle manière que le premier corps de tambour de filtration(7) puisse être déplacé relativement avec toute la longueur axiale de son premier moyen de filtration (33) sur la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) définie par le deuxième moyen de filtration (47), une partie d'extrémité axiale (98) de la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) ne pouvant pas être balayée par le premier corps de tambour de filtration (7) devant le premier corps de tambour de filtration (7).
  4. Centrifugeuse à poussoir selon la revendication 3, dans laquelle la partie d'extrémité axiale (98) de la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) définie par le deuxième moyen de filtration (47), qui ne peut pas être balayée par le premier corps de tambour de filtration (7), a une dimension superficielle supérieure à celle de la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) définie par le premier moyen de filtration (33).
  5. Centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 4, dans laquelle l'étendue axiale du deuxième moyen de filtration (47) est au moins deux fois la longueur de l'étendue axiale du premier moyen de filtration (33).
  6. Centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 4, dans laquelle le mécanisme de mouvement relatif (27) est configuré de telle manière que la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) ne puisse être balayée axialement vers l'avant dans un sens s'éloignant du fond de poussée (25) par le premier corps de tambour de filtration (7) qu'à un tel point que la partie d'extrémité (98) de la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) définie par le deuxième moyen de filtration (47), restant entre le premier corps de tambour de filtration (7) et une extrémité (102) avant du deuxième corps de tambour de filtration (13) éloignée du fond de poussée (25), laquelle partie d'extrémité (98) ne pouvant pas être balayée axialement par le corps de tambour de filtration, ait une étendue axiale qui est supérieure ou égale à l'étendue axiale de la partie présente au maximum devant le fond de poussée (25) de la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) définie par le premier moyen de filtration (33), ou qui est supérieure ou égale à l'étendue axiale de la surface périphérique intérieure (9) du premier corps de tambour de filtration (7).
  7. Centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 6, comportant en outre un dispositif d'alimentation (69) pour alimenter le tambour de filtration (3) en matériau à filtrer (71), dans laquelle le dispositif d'alimentation (69) comprend un dispositif de distributeur d'alimentation (75) qui est disposé à l'intérieur du tambour de filtration (3) et qui comprend une sortie (77) qui est configurée et orientée de telle manière que le matériau à filtrer (71) soit distribué par la sortie (77) par rapport à l'axe longitudinal (5) du tambour de filtration (3) obliquement vers le fond de poussée (25) et radialement vers l'extérieur sur la surface périphérique intérieure (9) du premier corps de tambour de filtration (7).
  8. Centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 7, dans laquelle le deuxième corps de tambour de filtration (13) est plus de deux fois plus long que le premier corps de tambour de filtration (7), vu dans le sens de l'axe longitudinal (5) du tambour de filtration.
  9. Centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 8, dans laquelle la distance radiale entre la surface périphérique extérieure (11) et la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) est inférieure ou égale à 70 mm, et/ou dans laquelle la distance radiale entre la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) et la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) est inférieure ou égale à 70 mm.
  10. Procédé d'actionnement d'une centrifugeuse à poussoir (1) selon l'une quelconque des revendications 1 à 9 en mode de fonctionnement avec filtre, dans lequel le mécanisme de mouvement relatif (27) est réglé et/ou contrôlé à une telle longueur de course que, vu à partir du fond de poussée (25) dans le sens de l'axe longitudinal (5) du tambour de filtration (3), respectivement au moins 50% de la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) formée par le premier moyen de filtration (33) sont balayés par le fond de poussée à des intervalles périodiques déterminés par la fréquence de course, et dans lequel
    le mécanisme de mouvement relatif (27) est réglé et/ou contrôlé à une telle longueur de course que la surface périphérique intérieure (15) du deuxième corps de tambour de filtration (13) définie par le deuxième moyen de filtration (47) n'est balayée axialement par le premier corps de tambour de filtration (7) qu'à un tel point que la partie de surface de la surface périphérique du deuxième corps de tambour de filtration (13) non-balayée, restant devant le premier corps de filtrage (7), soit supérieure ou égale à la partie de surface de la surface périphérique intérieure (9) du premier corps de tambour de filtration (7) formée par le premier moyen de filtration (33), présente au maximum devant le fond de poussée.
EP13155983.3A 2012-03-02 2013-02-20 Centrifugeuse à poussoir et procédé de fonctionnement d'une centrifugeuse à poussoir Active EP2633918B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012101787A DE102012101787A1 (de) 2012-03-02 2012-03-02 Schubzentrifuge und Verfahren zum Betreiben einer Schubzentrifuge

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EP2633918A2 EP2633918A2 (fr) 2013-09-04
EP2633918A3 EP2633918A3 (fr) 2017-04-26
EP2633918B1 true EP2633918B1 (fr) 2018-04-11

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EP13155965.0A Active EP2633917B1 (fr) 2012-03-02 2013-02-20 Centrifugeuse à poussoir et procédé de fonctionnement d'une centrifugeuse à poussoir
EP13155983.3A Active EP2633918B1 (fr) 2012-03-02 2013-02-20 Centrifugeuse à poussoir et procédé de fonctionnement d'une centrifugeuse à poussoir

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JP6618433B2 (ja) * 2016-07-05 2019-12-11 月島機械株式会社 遠心分離装置および遠心分離方法
DE102019117721B4 (de) * 2019-07-01 2022-03-24 Andritz Kmpt Gmbh Schubzentrifuge
CN113851971B (zh) * 2021-08-04 2024-02-02 广州朗豪自动化科技有限公司 一种控制柜

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NL184631B (nl) * 1953-02-10 Lubrizol Corp Omzettingsprodukt van een door een alkyl- of alkenylgroep gesubstitueerd barnsteenzuur of een anhydride daarvan met een hydroxyalkylamine, alsmede in water gedispergeerde functionele vloeistoffen, die het omzettingsprodukt als dispergeermiddel bevatten.
CH312160A (de) * 1954-05-12 1955-12-31 Escher Wyss Ag Mehrstufige Schubschleuder.
DE1079551B (de) 1956-03-31 1960-04-07 Krauss Maffei Ag Schubzentrifuge mit einem scheibenfoermigen Schubboden und einem das Schleudergut auf dem Trommelmantel verteilenden Einlauftrichter
DE1044721B (de) * 1956-04-04 1958-11-20 Krauss Maffei Ag Schubzentrifuge mit einer stufenfoermigen Siebtrommel
BE569014A (fr) 1957-07-06
GB1047434A (fr) 1962-06-04
FR2334420A1 (fr) 1975-12-12 1977-07-08 Dietrich & Cie De Essoreuse a poussee axiale
DE3220247A1 (de) 1982-05-28 1983-12-01 Reinhold Dipl.-Ing. 8000 München Schilp Vorrichtung zur vorbehandlung des beschickungsgutes in schubzentrifugen
DE19546019C1 (de) 1995-12-09 1997-02-20 Siteg Siebtech Gmbh Schubzentrifuge
EP1468742B1 (fr) 2003-04-16 2016-11-23 Ferrum AG Centrifugeuse à poussoir avec plusieur étages
EP1468743A1 (fr) 2003-04-16 2004-10-20 Ferrum AG Centrifugeuse-pousseuse

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Publication number Publication date
EP2633918A2 (fr) 2013-09-04
DE102012101787A1 (de) 2013-09-05
EP2633917A3 (fr) 2017-04-26
EP2633917B1 (fr) 2018-04-11
EP2633918A3 (fr) 2017-04-26
EP2633917A2 (fr) 2013-09-04

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