EP0553022A1 - Vorrichtung zur Zwangsentnahme der dichten Phase in einem Apparat für Zentrifugaltrennung - Google Patents

Vorrichtung zur Zwangsentnahme der dichten Phase in einem Apparat für Zentrifugaltrennung Download PDF

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Publication number
EP0553022A1
EP0553022A1 EP93400127A EP93400127A EP0553022A1 EP 0553022 A1 EP0553022 A1 EP 0553022A1 EP 93400127 A EP93400127 A EP 93400127A EP 93400127 A EP93400127 A EP 93400127A EP 0553022 A1 EP0553022 A1 EP 0553022A1
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EP
European Patent Office
Prior art keywords
rotor
flaps
enclosure
forced withdrawal
collector
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Withdrawn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
EP93400127A
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English (en)
French (fr)
Inventor
Pierre Laurent Saget
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Individual
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Individual
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Publication date
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Publication of EP0553022A1 publication Critical patent/EP0553022A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers
    • B04B2005/125—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers the rotors comprising separating walls

Definitions

  • the present invention relates to a device for forced withdrawal of the heavy phase from a centrifugal separation device.
  • the centrifugal separation device of the type to which the forced withdrawal device applies comprises a fixed enclosure and a centrifugal rotor between which a functional peripheral clearance is provided and in particular allows the evacuation of the heavy phase which reaches it.
  • a first type of known device comprises a rotor constituted by slotted discs or slotted cones stacked in such a way that they are angularly offset from one to the other and that their slits (or openwork) define channels helical through which live streams of mixture to be treated flow under the effect of the upstream pressure drop which is transformed into a rotation speed superimposed on that of the rotor.
  • Such a rotor made up of slotted discs or cones can be mounted in the device described in French patent no. 2,468,410 and operating against the current. It is organized so that the axial components of the flow of the mixture to be treated through the rotor and of the flow of the mixture of the boundary layer through the clearance between rotor and enclosure (heavily loaded in heavy phase) are directed in direction opposites.
  • This same rotor can be mounted in the apparatus described in French Patent No. 2,575,676 and proceeding at an equal current. It is organized so that the above-mentioned axial components are directed in the same direction.
  • a second type of known device described in the French patent application filed on August 27, 1990 under No. 90 10693 comprises a rotor with longitudinal blades curved transversely preferably in logarithmetic spirals and provided with oblique ribs.
  • a third type of known device described in French patent application No. 2,646,102 comprises a rotor constituted by at least one helical partition channeling the mixture to be treated.
  • French patent application No. 2,630,348 describes improvements applicable to the device of the first type.
  • One of these improvements consists in removing the heavy phase as it reaches the periphery by providing, facing the rotor over its entire height, a collection grid. This is made up of sections delimiting slots in the enclosure and opening into an external manifold. The flaps extend, if we consider in a plane perpendicular to the axis of the rotor the direction of rotation thereof, from the rear interior to the front exterior.
  • Another improvement consists in recycling the light phase extracted at the same time as the heavy phase, by making it pass from outside to inside a transfer grid, for example, carried by the wall of the fixed enclosure, this grid is similar to the collection grid.
  • the first is that the light phase circulates in the peripheral clearance in front of the oblique flaps of the grid and that only the centrifugal field can intervene to make particles or droplets penetrate into the slots separated by these flaps and send them into the external collector.
  • the radial speed of displacement generated by the centrifugal field is insufficient, taking into account the short residence time of said particles or droplets at this level, to ensure this penetration.
  • the second reason for this insufficient efficiency is that the manifold and the peripheral clearance zone are in communication over the entire height of the rotor, that consequently, the difference in static pressure between the upstream and downstream of the rotor is found in the collector and can generate in it a flow from bottom to top having substantially the same velocity as the flow in the play area. Therefore, a certain upward entrainment of particles or droplets can occur and harms to the evacuation of these by the bottom of the collector. A fan is then provided at the top of the rotor to generate an additional flow more or less effectively annihilating this phenomenon. However, the light phase flux thus created in the collector must be recycled without the particles or droplets which have reached it and this result is obtained thanks to the aforementioned transfer grid.
  • the object of the present invention is to remedy this insufficiency of efficiency for approaching absolute separating power, even for the finest particles or droplets.
  • the invention provides a device for forced withdrawal of the heavy phase which has reached the peripheral clearance existing between the centrifuge rotor and the fixed enclosure of a separation device, a device which, as is known, comprises , facing the rotor, a collection grid constituted by flaps delimiting slots made in the enclosure and opening into an external manifold, the flaps extending, if we consider in a plane perpendicular to the axis of said rotor the direction of rotation of the latter, from the rear interior to the front exterior.
  • the enclosure comprises, to receive the collection grid, a frustoconical part converging downstream, the envelope of the inner edge of the flaps of the grid and the peripheral envelope of the part of the rotor located opposite also converging downstream.
  • collectors are closed to collect the particles or droplets of the heavy phase or whether they are permanently or periodically connected to a circuit for discharging the said heavy phase
  • this or these collectors can be connected to the fixed enclosure by upstream of the rotor through a transfer device (filtering membrane, baffling, louver or other) allowing the recycling of the light phase and opposing the penetration into said enclosure of most of the separated heavy phase.
  • the transfer device is a louver which, like the collection grid, has flaps and slots, but whose transfer flaps are inclined unlike the collection flaps, that is to say of the rear outside towards inside front if we consider the direction of rotation of the rotor in a plane perpendicular to it.
  • the slots formed in a limited sector of the periphery of the enclosure can be connected to a collecting sheath tangentially supplying a cyclone; the collecting sheath is in a downward slope towards the upstream of the flow of the mixture.
  • the centrifugal device illustrated in FIGS. 1 and 2 comprises a fixed enclosure 1 having a cylindrical body 2 extended by a frustoconical base 3. At the lower part of the body 2 is tangentially connected a pipe 4 for admitting the mixture to be treated.
  • the purified light phase is discharged at the top of the body 2 by means not shown, while the separate heavy phase descends along the frustoconical wall of the base 3 and escapes by a tubular end piece 3a.
  • the enclosure 1 supports, by means of bearings not shown, a treatment rotor 5 constituted by cones 6 delimiting slots 7 or other openings and having, along these, edges 8 called rear upstream (if we consider the direction T of rotation and the direction F of axial flow of the mixture) and of the flanges 9 said before downstream.
  • a treatment rotor 5 constituted by cones 6 delimiting slots 7 or other openings and having, along these, edges 8 called rear upstream (if we consider the direction T of rotation and the direction F of axial flow of the mixture) and of the flanges 9 said before downstream.
  • the cones 6 (or flat disks not shown perpendicular to the axis of rotation) are fixed to a central shaft 10 whose upper end coupled to a gearmotor unit is integral with the rotor of a fan whose volute channels the phase slightly separated, these bodies not being shown.
  • the fan generates a pressure drop upstream of the rotor 5, which is transformed into a helical speed by the first cone 6 thereof or a distributor of another type.
  • the cones are advantageously equidistant and angularly offset from one another so as to make the slope of the abovementioned helical speed coincide with the slope of the envelopes of the spiral helical mixing veins flowing through the slots 7 of said cones. Moreover, these veins rotate faster than the rotor 5 and are subjected to a centrifugal field much more intense than that which solicits the dead helical blades of mixture which separates the veins, rotate substantially at the same speed as the rotor.
  • a device 12 for forced withdrawal of the heavy phase is then put in place.
  • the downstream cones 6. av (two in number in the example shown) have a smaller outside diameter than that of the upstream discs 6. am so that the clearance 11 widens inwards and forms opposite those -this a chamber 13.
  • a collection grid 14 belonging to the body 2 projects into the chamber 13 so as to be supplied radially by the downstream cones 6. av and axially by the set of upstream cones 6 am.
  • the collection grid 14 is constituted by flaps 15 delimiting between them slots 16.
  • the flaps 15 protrude into the chamber 13 as close as possible to the downstream cones 6 av and into an external collector 17. They are inclined, if one consider the direction T of rotation of the rotor 5, from the rear interior to the front exterior ( Figure 2) and form a circular louver. They receive the phase heavy precipitated towards the periphery by the rotor 5, as well as the heavy phase of the leak channeled into the clearance 11 and crossing the louver while being precipitated towards the periphery by the centrifugal field created by the rotation of this leak. The heavy phase thus precipitated on the flaps follows the slope of the latter and is also driven by the light phase through the slots 16. This heavy phase is thus trapped in the collector 17 and travels towards the helical bottom 18 of this one.
  • the collector 17 is closed at the top by a wall 19 and provided at the bottom with a funnel 20.
  • This funnel can be permanently closed by a plug 21, shown in phantom in Figure 1, allowing the collector to be emptied when the funnel is full.
  • the funnel can also be connected by a tube 22 (FIG. 1) to a circuit for discharging the heavy phase.
  • the funnel can finally be connected periodically to said circuit, by means of a rotary lock 23 ( Figure 1) shown in phantom.
  • the light phase reaching the collector 17 can escape by a passage calibrated either in the open air, or to an additional purification device connected at its outlet to the aforementioned volute of the fan discharging the light phase.
  • This first embodiment of the device 12 for forced withdrawal of the heavy phase is applicable to other types of centrifugal apparatus.
  • the rotor 5 has longitudinal blades 24 fixed at the center on the drive shaft 10 and at the periphery on rings 25, 26. As shown Figure 4, these blades are advantageously shaped in logarithmic spirals. They have downstream notches 27 making it possible to delimit the withdrawal chamber 13 into which the clearance 11 opens and the collecting grid 12 protrudes.
  • the first embodiment of the device 12 according to Figures 1 and 2 is also applicable to the device illustrated in Figure 5.
  • the rotor 5 comprises one or more helical partitions 28 channeling the mixture to be treated.
  • the downstream turn (s) have a smaller outer radius "r" than the outer radius "R” of the upstream turns so as to form a narrowing which delimits the withdrawal chamber 13 into which the clearance 11 opens and projects the collection grid 12.
  • the collector 17 can be the seat of a relatively large flow of light phase. In this case, it may be advantageous to recycle this light phase in the centrifugal device upstream of the rotor without causing a heavy phase.
  • a second embodiment of the forced withdrawal device 12 is shown in Figures 6 to 8 which illustrate this recycling
  • the body 2 of the enclosure is deeper to space the rotor 5 of the tangential pipe 4 for admitting the mixture and defining above it a chamber 30 for rotating the mixture and recycling the light phase.
  • the collector 17 extends up to substantially at the level of the tubing 4 and communicates with the chamber 30 by means of a transfer device 31.
  • This device can be of any type: with mass filtration membrane , membrane, surface filtration membrane, baffle or other and with coalescence device with frustoconical deflectors, perforated cylinders etc ... if the concentrated mixture flowing in the collector 17 is a mist. Examples of embodiments are already described in French patent application No. 2,630,348 and can be used in the device illustrated in FIG. 5.
  • the transfer device 31 is of another type and constituted by a louver or grid similar to that of collection 14.
  • the louver 31 has flaps 32 separated by slots 33.
  • the flaps 15 of the collection grid 14 are, if we consider the direction T of rotation of the rotor 6, inclined from the rear interior to the front exterior
  • the flaps 32 of the transfer grid 31 are, if we consider the direction T1 of rotation of the mixture concentrated in the manifold 17, inclined from the rear outside to the front inside.
  • This symmetrical inclination of the flaps 15 and 32 allows the concentrated mixture to exit from the enclosure 1 through the slots 16 to enter the collector 17 and the light phase to be recycled to enter the enclosure 1 through the slots 33 for s escape from the collector 17.
  • the flows in the slots 16 and 33 according to the arrows G1 and G2 are oriented symmetrically since they are directed respectively towards the outside and towards the inside so as not to oppose the rotation of the mixture in the enclosure 1 and collector 17.
  • Figures 9 and 10 show the equal current centrifugal separation device mentioned in the above and described in the French patent n ° 2.575.676.
  • the forced withdrawal device illustrated in Figures 1 to 8 can also be applied to this device.
  • the equicurrent centrifugal separation apparatus comprises a rotor 5, the slit cones 6 of which form a body with a central tubular barrel 34 mounted to rotate in bearings 35 of the fixed enclosure 1.
  • the treatment chamber 37 is connected, by l 'through a tangential suction pipe 39, on a source of the mixture to be treated.
  • the evacuation chamber of the light phase 38 communicates, through the internal conduit of the barrel 34, through orifices 40 and 41, with the base of the chamber 37 under the rotor 5.
  • a nozzle 3a of the frustoconical base 3 extending the body 2 of the enclosure 1 channels the separated heavy phase to evacuate it.
  • Figures 9 and 10 clearly show that the axial component F.1 of the helical flow of the mixture to be treated through the rotor 5 is directed downwards as the axial component G of the helical flow of the concentrated mixture in heavy phase to through the clearance 11 formed between the rotor 5 and the enclosure 1. It is therefore an equicurrent treatment by which the heavy phase is less likely to re-mix
  • FIG. 9 illustrates the application of the collection grid 14 to this cross-current device.
  • the grid 14 with flaps 15 and slots 16 is integrated into the body 2. It projects inside, in the chamber 13 resulting from the narrowing of the clearance 11. It also projects, outside in a phase collector 17 heavy, concentrically surrounding the lower end of the body 2, the frustoconical base 3 and the nozzle 3a. .
  • the collection grid 14 of this equicurrent device shown in FIG. 9 operates in the same way as that 14 of the counter-current device illustrated in FIG. 1.
  • FIG. 10 also illustrates the application to this equicurrent device of the collection grid 14, but with recycling of the light phase which has reached the collector 17.
  • At least one conduit 42 connects the upper part of the collector 17 to the upper part of the treatment chamber 37.
  • a transfer grid 31 can be mounted in the duct (s) 42 or at at least one of their ends.
  • the collection grid 14 described in the foregoing is mounted on a cylindrical part of the body 2 of the fixed enclosure.
  • the body 2 may have a frustoconical part 43 converging downstream.
  • This frustoconical part makes it possible to reduce the slope of the helical path of ascent (FIGS. 1 to 8) or of descent (FIGS. 9 and 10) of the particles or droplets and thus increase the time of passage in front of the collection grid 14.
  • the envelope of the outer edge of the cones 6 and the envelope of the inner edge of the flaps 15 are frustoconical and equidistant.
  • FIGS 11 and 12 also show that, in the case where the heavy phase consists of "fines", it may be advantageous to combine the forced withdrawal device with a partial washing circuit.
  • This comprises spray nozzles 44 mounted at the head of the manifold 17 and diffusing the liquid in a substantially homogeneous manner therein.
  • the collector 17 may not be sufficient to ensure the final evacuation of these products. Indeed, the collector does not have a truly effective internal device stimulating the descent of the collected products. It is not the same inside the enclosure 1 where the rotor ensures a real "sweep" of the collection surface and facilitates the descent of the products.
  • the forced withdrawal device can cooperate with at least one cyclone 45 as shown in FIGS. 13 and 14.
  • the withdrawal opening occupied by the collection grid covers only part of the periphery. This arrangement is possible because the products entrained by the ascending current (in the counter-current device according to FIG. 13) or descending (in the equicurrent device according to FIGS. 9 and 10) follow spirals whose angle of rise or descent is very low and it is therefore not necessary to cover the entire periphery.
  • the collecting grid 14 of limited angular extent opens into a collecting sheath 46 connected by an elbow 47 to the volute 48 of the cyclone 45.
  • the mixture leaving the collecting grid 14 is therefore channeled and introduced tangentially at the top of the body 49 of the cyclone, around a sleeve 50 for venting to stabilize the vortex.
  • the cylindrical body 49 is extended by a frustoconical base 51 open at its lower end for the evacuation of the heavy phase separated in the cyclone and is provided with a tube tangential to the body 2 of the device slightly above the tube 4 for admitting the mixture to be treated so that said light phase turns in the same direction as the latter.
  • the collecting sheath 46 is on a downward slope.
  • the withdrawal opening can cover almost the entire periphery of the enclosure 1 of the device.
  • several cyclones fed by as many collecting ducts covering as many grids can be provided. Three are shown in Figure 14, one of which is in solid line and the other two in phantom.

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  • Centrifugal Separators (AREA)
EP93400127A 1992-01-24 1993-01-20 Vorrichtung zur Zwangsentnahme der dichten Phase in einem Apparat für Zentrifugaltrennung Withdrawn EP0553022A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9200788A FR2686528B1 (fr) 1992-01-24 1992-01-24 Dispositif de soutirage force de la phase lourde dans un appareil de separation centrifuge.
FR9200788 1992-01-24

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EP0553022A1 true EP0553022A1 (de) 1993-07-28

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EP93400127A Withdrawn EP0553022A1 (de) 1992-01-24 1993-01-20 Vorrichtung zur Zwangsentnahme der dichten Phase in einem Apparat für Zentrifugaltrennung

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EP (1) EP0553022A1 (de)
FR (1) FR2686528B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163924A1 (de) * 2001-12-22 2003-07-03 Mahle Filtersysteme Gmbh Verfahren und Vorrichtung zum Separieren einer Verunreinigung aus einem Trägerfluid
WO2005032723A1 (en) * 2003-10-07 2005-04-14 3Nine Ab Centrifugal separator for cleaning gases
EP1993702B1 (de) 2006-02-13 2018-03-28 Alfa Laval Corporate AB Zentrifugalabscheider
CN113998859A (zh) * 2021-11-15 2022-02-01 浙江问源环保科技股份有限公司 一种污泥深度脱水处理系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2714850A1 (fr) * 1994-01-12 1995-07-13 Saget Pierre Appareil séparateur et épurateur de la pollution d'au moins un mélange gazeux.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575676A1 (fr) * 1985-01-07 1986-07-11 Saget Pierre Appareil pour la separation centrifuge d'un melange de phases
FR2630348A1 (fr) * 1988-04-25 1989-10-27 Saget Pierre Dispositif permettant de pieger dans un appareil de separation centrifuge la phase lourde
FR2648361A1 (fr) * 1989-06-16 1990-12-21 Alsthom Gec Separateur de particules pour flux gazeux

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575676A1 (fr) * 1985-01-07 1986-07-11 Saget Pierre Appareil pour la separation centrifuge d'un melange de phases
FR2630348A1 (fr) * 1988-04-25 1989-10-27 Saget Pierre Dispositif permettant de pieger dans un appareil de separation centrifuge la phase lourde
FR2648361A1 (fr) * 1989-06-16 1990-12-21 Alsthom Gec Separateur de particules pour flux gazeux

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163924A1 (de) * 2001-12-22 2003-07-03 Mahle Filtersysteme Gmbh Verfahren und Vorrichtung zum Separieren einer Verunreinigung aus einem Trägerfluid
WO2005032723A1 (en) * 2003-10-07 2005-04-14 3Nine Ab Centrifugal separator for cleaning gases
US7396373B2 (en) 2003-10-07 2008-07-08 3Nine Ab Centrifugal separator for cleaning gases
EP1993702B1 (de) 2006-02-13 2018-03-28 Alfa Laval Corporate AB Zentrifugalabscheider
EP1993702B2 (de) † 2006-02-13 2022-11-02 Alfa Laval Corporate AB Zentrifugalabscheider
CN113998859A (zh) * 2021-11-15 2022-02-01 浙江问源环保科技股份有限公司 一种污泥深度脱水处理系统

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Publication number Publication date
FR2686528A1 (fr) 1993-07-30
FR2686528B1 (fr) 1994-04-29

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