US3623656A - Three-phase centrifuge - Google Patents

Three-phase centrifuge Download PDF

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US3623656A
US3623656A US7285A US3623656DA US3623656A US 3623656 A US3623656 A US 3623656A US 7285 A US7285 A US 7285A US 3623656D A US3623656D A US 3623656DA US 3623656 A US3623656 A US 3623656A
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Prior art keywords
bowl
liquid
group
discharge openings
liquid discharge
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US7285A
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Andre C Lavanchy
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Alfa Laval AB
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Pennwalt Corp
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Assigned to ALFA-LAVAL AB, GUSTAVSLUNDSVAGEN-147, ALVIK, STOCKHOLM, SWEDEN, A CORP. OF SWEDEN reassignment ALFA-LAVAL AB, GUSTAVSLUNDSVAGEN-147, ALVIK, STOCKHOLM, SWEDEN, A CORP. OF SWEDEN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PENNWALT CORPORATION, A PA CORP.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • each having different specific gravities. are separated in a centrifuge having a helical screw conveyor mounted within an elongated bowl tapered at one end
  • a group of solids discharge openings is disposed at the tapered end. and two groups of concentrically arranged liquid discharge openings. one for each separated liquid. are disposed at the other end of the bowl
  • One group of liquid discharge openings has an annular ring dam mounted adjacent thereto to serve as a weir; the second group ofliquid discharge openings has an annular channel disposed adjacent thereto for receiving the separated liquid discharged therethrough, and a skimmer passage disposed within the channel for receiving the liquid within the channel
  • a centrifuge having a helical screw conveyor mounted within an elongated bowl tapered at one end
  • a group of solids discharge openings is disposed at the tapered end. and two groups of concentrically arranged liquid discharge openings. one for each separated liquid. are disposed at the other end of the bowl
  • One group of liquid discharge openings has an annular ring
  • the centrifuge contains a plurality of radially extending ribs mounted adjacent to the two groups of liquid discharge openings for controlling the rotational speed of the separated liquids with respect to the bowl immediately prior to discharge of the liquids. Also, a scraper member is mounted on the screw conveyor for the removal of solids which have accumulated on the inner annular surface of the bowl, and a vane is rigidly mounted between adjacent flights of the conveyor to exclude the lighter of the two separated liquids from the space adjacent to the solids discharge openings.
  • This invention relates to centrifugal separators, but more particularly to a three-phase solid bowl centrifugal separator for separating liquids from finely divided solids, i.e., a centrifuge for separating solids, a first liquid, and a second liquid, each having different specific gravities, from feed comprising a liquids-solids mixture.
  • such a centrifuge comprises an elongated bowl, tapered at one end, and mounted for rotation about an axis.
  • a helical screw conveyor Coaxially mounted within the bowl is a helical screw conveyor which is adapted to rotate at a speed slightly different than the speed of the bowl.
  • Feed is introduced into the bowl, and due to centrifugal force effected by the rotation of the bowl, the feedseparates into its component parts. Due to the slight difference in the rotational speed between the bowl and the helical screw conveyor, the solids sedimented against the wall are conveyed along the inner annular surface of the bowl to solids discharge openings located at the tapered end of the bowl, while two separated liquids simultaneously exit through separate liquid discharge openings.
  • centrifuges utilize two liquid discharge conduits, one for each separated liquid. These liquid discharge conduits are supported deep within the central portion of the centrifuge bowl, and although normally stationary, are mounted so as to be radially adjustable. This allows the radial position of the conduits to be changed during rotation of the centrifuge bowl to skim ofi' desired amounts of each of the separated liquids.
  • One difficulty presented with this arrangement is the problem of supporting such conduits deep within a centrifuge bowl which is rotating at an extremely high speed.
  • Another is the necessarily complex arrangements needed to seal against leakage, and to vary the radial positions of the conduits during operation of the centrifuge bowl.
  • centrifuges of the prior art have groups of liquid discharge openings, one group for each separated liquid, disposed in the centrifuge bowl.
  • the openings are arranged and the centrifuge is operated such that during discharge of the separated liquids, each opening is normally completely filled with the liquid being discharged.
  • An individual plate is adjustably mounted adjacent to each opening to vary the size of the opening to control the discharge of the separated liquid. This has the disadvantage of not only being time consuming, but necessitates stopping the centrifuge to make necessary adjustments.
  • varying the size of each opening in this manner has the effect of choking the system which lowers the overall efficiency of the centrifuge. For example, fluid flow through an ordinary conduit is choked when the area of the conduit through which the fluid is flowing is reduced.
  • one of the principal objects of the present invention is to provide a three-phase centrifuge of relatively simple construction which optimizes the efficiency of the separation process.
  • Another object of the present invention is to provide a three-phase centrifuge which minimizes the loss of one of the separated liquids through the solids discharge openings.
  • Another object of the present invention is to provide a centrifuge which prevents the accumulation of solids along the inner annular wall of the centrifuge bowl.
  • Another object of the present invention is to provide a three-phase centrifuge which prevents relative rotation between the separated liquids and the centrifuge bowl immediately prior to discharge ofthe liquids.
  • Another object of the present invention is to provide a three-phase centrifuge in which the line of separation between two separated liquids is adjustable during the operation of the centrifuge.
  • Another object of the present invention is to provide a three-phase centrifuge having a wider range of potential adjustment of the line of separation between two separated liquids.
  • Another object of the present invention is to provide a three-phase centrifuge in which major adjustments for the separation process can be made before the centrifuge is put into operation, and minor adjustments can be made during the operation of the centrifuge.
  • Another object of the present invention is to provide a three-phase centrifuge which prevents discharge of any interfacial emulsion layer along with one of the desired separated liquids.
  • the present invention seeks to accomplish such objects by providing a countercurrent three-phase centrifuge having an annular ring dam disposed adjacent to a first group of liquid discharge openings for initial and major adjustment of the E-line, i.e., the line of separation between two liquid phases within a centrifuge bowl. Further provided is a skimming means mounted adjacent to a second group ofliquid discharge openings for fine adjustment of the E-line during the operation of the centrifuge, each group of liquid discharge openings being disposed in the same end of the centrifuge bowl.
  • the centrifuge is also provided with means for preventing loss of one of the separated liquids through the solids discharge openings, and with means for preventing the accumulation of solids on the inner annular surface of the bowl.
  • a series or plurality of radially extending ribs mounted adjacent to the first and second groups of liquid discharge openings for preventing relative rotation between the separated liquids and bowl immediately prior to discharge of the liquids.
  • FIG. 1 is an elevational view of a three-phase centrifuge embodying the invention with a portion broken away to show the interior thereof in section;
  • FIG. 2 is an enlarged sectional view, showing the liquid discharge end of the centrifuge in detail
  • FIG. 3 is an enlarged view, taken along line 3-3 of FIG. 2 showing the plurality of radially extending ribs mounted adjacent to the liquid discharge outlets;
  • FIG. 4 is an enlarged view, taken along line 44 of FIG. 1, showing a vane mounted on the hub ofthe helical conveyor;
  • FIG. 5 is an enlarged view showing a mechanical linkage for controlling a skimmer passage as embodied in the present invention.
  • FIG. 1 of the drawings there is illustrated a three-phase centrifuge, designated generally by the numeral 10, having an imperforate centrifuge bowl l2, journaled at the ends thereof in main bearings 13 and 15.
  • the bowl 12 is disposed within a cover 14, and adapted to be belt driven by a motor (not shown), the belt extending around a pulley 16.
  • the centrifuge bowl 12 is capable of being rotated, about an axis through the center thereof, at speeds which will generate a centrifugal force equal to several thousand times the force of gravity.
  • Disposed within the bowl 12 is a helical screw conveyor 18 adapted to rotate at a speed that is slightly different than that of the bowl 12.
  • the helical conveyor 18 includes coiled screw flights 20, the distal edges of the screw flights 20 generally complementing the inside contour of the bowl 12.
  • the bowl 12 and the conveyor 18 are mounted in coaxial relationship.
  • the axially elongated bowl 12 is mainly of imperforate cylindrical construction.
  • the end portion 22 of the bowl adjacent to end wall 24 is of convergent or truncoconical form, its inner annular surface gradually decreasing in diameter toward the end wall 24.
  • a group of solids discharge openings 26 Disposed within the end portion 22, and adjacent to end wall 24, is a group of solids discharge openings 26 symmetrically arranged about the rotational axis. Disposed at the other end of bowl 12 is an end member 28. Integral with end member 28 is a front hub 29 which is supported within main bearing 13. A first group of liquid discharge openings 30 is symmetrically disposed with respect to the axis of rotation within end member 28 adjacent to the inner annular face of bowl 12. A second group of liquid discharge openings 32 is symmetrically disposed within end member 28 at a lesser radial distance from the axis of rotation than openings 30. As can be seen in FIG. 2, and which will be more fully explained later, during rotation of the bowl 12 the liquids separate into two concentric pools, heavy liquid phase discharging through openings 30, while light liquid phase is discharging through openings 32.
  • the helical screw conveyor I8 being hollow, has a feed chamber 34 disposed therein.
  • the process feed stream, or liquids-solids mixture to be separated, is introduced into feed chamber 34 through an axially extending feedpipe 36.
  • This mixture is then delivered from feed chamber 34, through a plurality of radially extending passages 38 disposed within the helical conveyor 18, into a separation chamber 40.
  • the separation chamber 40 is defined by the inner surface of the bowl 12 and the helical conveyor 18.
  • annular ring darn 42 Mounted within the bowl l2, and adjacent to liquid discharge openings 32, is an annular ring darn 42.
  • This ring darn 42 acts as a weir, over which light liquid phase flows on being discharged through liquid discharge openings 32.
  • Ring dam 42 is available in various sizes depending on the relative specific gravities of the two liquid phases to be separated. Thus, by knowing the concentration ofa mixture, and the relative specific gravities of each phase of the mixture, a. proper size ring dam can be selected which will provide a self-regulating centrifugal separation system.
  • the position of the E-line i.e., the line of separation between the two liquid phases, is fixed within the centrifuge bowl during the rotation thereof.
  • the purity of the recovered phases can be controlled, i.e., there will be no intermingling of the two liquid phases being discharged.
  • openings 32 are disposed and the centrifuge operated in a manner such that light liquid phase discharging through the openings 32 does not completely fill the openings, and the ring dam 42 acts only as a weir and does not reduce the flow area of the discharge passage actually used for conducting liquid since the latter is generously oversized.
  • underdam ring 44 Mounted within bowl l2, and adjacent to ring dam 42, is an underdam ring 44, which partially extends over liquid discharge openings 30, as shown in FIG. 3.
  • This underdam ring 44 is provided to compensate for a possible emulsion layer between the two liquid phases and to increase the range of potential E-line adjustment.
  • underdam ring 44 prevents the discharge therethrough of any emulsion which might form as a layer between the two liquid phases.
  • the ring 44 also blocks light liquid phase from discharging through the liquid discharge openings 30.
  • a plurality of radially extending ribs 46 is mounted to the face of underdam ring 44. These ribs 46 are symmetrically disposed around the circumference of the face of underdam ring 44, and extend over openings 30 and 32.
  • an annular screen member 48 is removably mounted to the faces of the ribs 46, the screen member extending in a radial direction to the same extent as the ribs 46.
  • the screen member 48, with its flowdirecting apertures, is an optional accessory which can be removed when not needed.
  • the ribs 46 serve to maintain zero relative rotational velocity between the liquids and bowl I2 by acting as abutting means for liquid particles tending to increase or decrease in rotational velocity with respect to the bowl. For example, if a liquid particle rotating at the same velocity as the bowl moves inwardly toward the axis of rotation, it will tend to increase in velocity. However, any liquid particle doing the same as it moves between adjacent ribs will immediately contact the edge of one of the ribs 46 which will thus halt movement of the liquid particle with respect to the bowl 12. Maintaining zero relative rotational velocity between the separated liquids and the bowl I2 is necessary to prevent shifting the position of the E-line during the separation process. An undesired change in the position of the E-line prevents achievement of the desired separation results.
  • a vane member 68 is mounted on helical screw conveyor 18. The latter extends between adjacent flights of the conveyor 18 at the right hand or solids discharge end of separation chamber 40.
  • This vane 68 is axially located on screw conveyor 18 immediately adjacent to the plurality of radially extending passages 38 (See FIG. 1).
  • the upper edge of vane 68 extends above the E- line or line of separation between the two liquid phases, and acts as a rotating dam which allows only heavy liquid phase to flow to this converging portion of separation chamber 40.
  • Scraper member 70 is Also mounted on helical screw conveyor 18 is a scraper member 70.
  • Scraper member 70 is positioned on the periphery of the flight adjacent to end member 28. Upon rotation of the helical screw conveyor 18, scraper member 70 removes any accumulations ofsolids on the inner annular surface of the centrifuge bowl adjacent to liquid discharge openings 30. This prevents clogging of the openings 30, and allows these accumulations of solids to be loosened, and conveyed toward the solids discharge openings 26 by the helical screw conveyor 18.
  • annular generally cup-shaped member 50 is mounted to the exterior side of end member 28.
  • This cup-shaped member 50 is comprised of a base portion 51 and an annular flange portion 53. It is noted that the inner annular surface of the flange portion 53 increases in diameter in a direction extending away from the base portion 51.
  • An annular zone 55 is thus defined by the outer surface of the bowl l2 and the inner annular surface of the flange portion 55.
  • Integral with the base portion 51 is a radially extending rim 52.
  • an annular channel 54 is defined by the annular cup-shaped 50 and end member 28, the channel 54 being disposed adjacent to liquid discharge openings 30. Thus, heavy liquid phase is discharged into the annular channel 54 during rotation of the centrifuge bowl 12.
  • a skimmer tube 56 disposed within the annular channel 54.
  • This skimmer tube 56 has a liquid inlet 58 See FIG. 5 disposed therein for receiving the heavy liquid phase from the annular channel 54, and a liquid outlet 59 for discharging the heavy liquid phase.
  • the skimmer tube 56 is mounted so that it can be radially moved into or out of channel 54 to receive more or less of the heavy liquid phase within the channel.
  • a suitable mechanism for radially moving the skimmer tube into or out ofchannel 54 is illustrated in FIG. 5.
  • the skimmer tube 56 is actuated through a crank 82, a threaded bolt 84, a slide member 89, a lever rod 85, and an eccentrically mounted skimmer ring 80, the threaded bolt 84 being threadably connected to the slide member 89.
  • the slide member 89 will slide into or out of the cover 14 and thus vary the radial position of the skimmer tube 56.
  • the adjustment range of the bolt 84 is limited by practical space considerations. Increased travel of skimmer tube 56 is obtained by changing the position of the connection between the slide member 89 and lever rod 85. As can be seen in FIG. 5, slide member 89 and lever rod 85 are held together by a removable pin at one of three positions, i.e., 86, 87, or 88. It is to be noted that the skimmer tube 56 is welded to the skimmer ring 80 so that liquid passes through the skimmer tube 56, outlet 59, and into a generally tangentially extending channel 81 formed in the skimmer ring 80. The present arrangement for radially moving the skimmer tube 56 is only one means for doing so. Other means, many of which are well known in the art, are equally satisfactory for moving the tube.
  • annular cup-shaped member 50 disposed on the outer periphery of the annular cup-shaped member 50 are two annular grooves 60 and 61. As can be seen, these grooves cooperate with two annular partitions 62 and 63 respectively to define two annular spaces 65 and 67 between the centrifugal bowl l2 and the cover 14. Because the member 50 rotates with centrifuge bowl 12, and the partitions 62 and 63 are stationary, this construction effectively seals the annular space 65 from the annular space 67 during operation of the centrifuge. It can be seen that light liquid phase will be discharged into annular space 65 via openings 32 and annular zone 55, while heavy liquid phase is discharged into annular space 67 via openings 30, annular channel 54, skimmer tube 56, and channel 81. The separated liquids are recovered from annular spaces 65 and 67 through appropriate discharge outlets (not shown).
  • openings 30 and 32 are not angularly aligned, but that openings 32 are located between adjacent openings 30. This allows for the crossover arrangement, i.e., openings 30 extend from the interior to the exterior of bowl 12 in a radially inward direction, while openings 32 extend from the interior to the exterior of the bowl in a radially outward direction. It can also be seen that each of the openings 30 forms a single extended passageway extending from separation chamber to annular channel 54, while each of the openings 32 includes a distinct passageway 33 extending the openings 32 to the outer annular surface of end member 28.
  • heavy liquid phase and light liquid phase are discharged in opposite directions, i.e., heavy liquid phase is discharged radially inward from separation chamber 40, via openings 30, and into annular channel 54, while light liquid phase is discharged radially outward from separation chamber 40, via openings 32, passageways 33, and into annular zone 55.
  • the process feed stream, or liquids-solids mixture to be separated is delivered through feed tube 36 into feed chamber 34, through radial passages 38, and into the separation chamber 40.
  • the mixture forms a layer against the inner annular surface of bowl 12, the solid particles being urged by reason of their high specific gravity to form a layer immediately next to the inner annular surface of the bowl, while the lighter liquid tends to rise toward the center of the bowl.
  • the liquid will separate into two concentric pools toward the center of the bowl, the heavy liquid phase being that pool nearest the inner annular surface ofthe bowl.
  • vane 68 serves to allow recovery of more of the light liquid phase because it is not carried out the solids discharge openings 26 with the discharged solids.
  • ring dam 42 is available in various sizes depending on the relative specific gravities of the two liquid phases.
  • a proper size ring dam can be selected before operation of the centrifuge is begun which predetermines the position of the E-line or line of separation between the two liquid phases. Therefore, the major adjustment of the E-line is made before the separation process is begun by selecting the proper size ring dam 42.
  • underdam ring 44 is provided to increase the range of potential E-line adjustment, and compensate for a possible emulsion layer. As can be seen in FIG. 2, underdam ring 44 extends partially over liquid discharge openings 30. Therefore, only the desired heavy liquid phase is discharged through openings 30, the underdam ring preventing the discharge of any interfacial emulsion, or light liquid phase.
  • heavy liquid phase is discharged through openings 30, into annular channel 54, into skimmer tube 56 and into the annular space 67.
  • the skimmer tube 56 is radially movable so that its liquid inlet 58 can be moved into or out of the channel 54 to recover more or less heavy liquid phase therefrom.
  • the dynamic pressure of the rotating liquid coming into contact with the inlet 58 promotes the flow ofliquid through the skimmer tube 56, and thus reduces the depth of the heavy liquid phase pool, and consequently the E-line position is changed.
  • skimmer tube 56 provides for the fine adjustment of the E-line position without stopping the centrifuge. Also, location of skimmer tube 56 on the exterior of bowl 12 allows for a more simplified construction, and eliminates the problem of supporting and sealing a skimmer tube extending deep into the central portion of the centrifuge bowl.
  • the present invention optimizes the efiiciency of the separation process by providing means to prevent, or compensate for, various conditions which may occur during the operation of the centrifuge, which conditions would normally prevent obtaining the desired separation results.
  • an elongated hollow bowl of circular cross section mounted for rotation about an axis, said bowl having an inner annular surface with a portion thereof decreasing in diameter approaching one end of said bowl, said bowl having a solids discharge opening disposed at said one end, the other end of said bowl having disposed therein a first group of liquid discharge openings for discharge of the first liquid, and a second group of liquid discharge openings for discharge of the second liquid, said second group of liquid discharge openings opening into the interior of said bowl at said other end at a lesser distance from the axis of rotation than said first group of liquid discharge openings;
  • annular ring darn means mounted adjacent said second group of liquid discharge openings, said ring dam means serving as a weir over which said second liquid flows upon being discharged;
  • a screw conveyor disposed within said bowl and mounted for coaxial rotation therein, said conveyor including an axially elongated hub radially spaced from said bowl to define therewith an annular separating chamber, flights mounted on said hub for movement therewith, said flights having their distal edges generally complementing the inside contour of said bowl;
  • feed means having an outlet, said outlet being positioned between said one end and said other end of said bowl,
  • annular ring dam means mounted adjacent said second group of liquid discharge openings, said ring dam means serving as a weir over which said second liquid flows upon being discharged;
  • a screw conveyor disposed within said bowl and mounted for coaxial rotation therein, said conveyor including an said outlet being adapted to introduce said feed into said axially elongated hub radially spaced from said how] to separating chamber; define therewith an annular separating chamber, flights e. and vane means mounted on said hub and extending mounted on said hub for movement therewith, said flights between adjacent flights, said vane means being located having their distal edges generally complementing the inadjacent said portion of said inner annular surface which side contour of said bowl;
  • said vane means being adapted 10 (1. feed means having an outlet, said outlet being positioned to exclude said second liquid from that portion of the between said one end and said other end of said bowl, separation chamber in which said vane means is posisaid outlet being adapted to introduce said feed into said tioned. separating chamber;
  • a three-phase centrifuge for separating solids, a first e. and means defining an annular channel on the exterior of liquid, and a second liquid, each having different specific said other end adjacent to said first group of liquid gravities, from feed comprising a liquids solids mixture, said discharge openings, said annular channel opening in an centrifuge comprising; inward direction and being adapted to receive said first a.
  • a screw conveyor disposed within said bowl and mounted a. an elongated hollow bowl of circular cross section for coaxial rotation therein, said conveyor including an mounted for rotation about an axis, said bowl having an axially elongated hub radially spaced from said bowl to inner annular surface with a portion thereof decreasing in define therewith an annular separating chamber, flights diameter approaching one end of said bowl, said bowl mounted on said hub for movement therewith, said flights having a solids discharge opening disposed at said one having their distal edges generally complementing the inend, the other end of said bowl having disposed therein a side contour of said bowl; first group of liquid discharge openings for discharge of d.
  • feed means having an outlet, said outlet being positioned the first liquid, and a second group of liquid discharge between said one end and said other end of said bowl, openings for discharge of the second liquid, said second said outlet being adapted to introduce said feed into said group of liquid discharge openings opening into the inseparating chamber; terior of said bowl at said other end at a lesser distance e. radically extending rib means mounted adjacent to said from the axis of rotation than said first group of liquid other end, said radially extending rib means being discharge openings, said first group of openings extending adapted to control the rotational velocity of one of said from the interior to the exterior of said bowl in a radially liquids with respect to said bowl; inward direction, said second group of openings extendf.
  • screen means mounted adjacent said plurality of radiing from the interior to the exterior of said bowl in a radially extending ribs, said screen means being adapted to reduce the turbulence of said first liquid and said second liquid being discharged through said first and said second groups of liquid discharge openings.
  • an elongated hollow bowl of circular cross section mounted for rotation about an axis, said how] having an inner annular surface with a portion thereof decreasing in diameter approaching one end of said bowl, said bowl having a solids discharge opening disposed at said one end, the other end of said bowl having disposed therein a first group of liquid discharge openings for discharge of the first liquid, and a second group of liquid discharge openings for discharge of the second liquid, said second group of liquid discharge openings opening into the interior of said bowl at said other end at a lesser distance from the axis of rotation than said first group of liquid discharge openings;
  • annular ring dam means mounted adjacent said second group of liquid discharge openings, said ring darn means ally outward direction, said second group of liquid discharge openings terminating at the outer annular surface of said bowl;
  • annular ring dam means mounted adjacent to said second group of liquid discharge openings, said ring dam means serving as a weir over which said second liquid flows upon being discharged;
  • a screw conveyor disposed within said bowl and mounted for coaxial rotation therein, said conveyor including an axially elongated hub radially spaced from said bowl to define therewith an annular separating chamber, flights mounted on said hub for movement therewith, said flights having their distal edges generally complementing the inside contour of said bowl;
  • feed means having an outlet, said outlet being positioned between said one end and said other end of said bowl, said outlet being adapted to introduce said feed into said separating chamber.
  • a three-phase centrifuge according to claim 4 including an annular cup-shaped member, said cup-shaped member comprising a base portion and an annular flange portion extending from said base portion, said flange portion having an inner annular surface which increases in diameter in a direction away from said base portion, said base portion mounted to the exterior of said other end and said flange portion extending in a direction toward said one end of said bowl, the inner annular surface of said flange portion and the outer annular surface of said bowl defining an annular zone, the outer annular surface of said flange portion having a plurality of annular grooves disposed therein.
  • annular cup-shaped member and said means being adapted to rotate with respect to each other, said annular zone communicating with said second space, said first group of liquid discharge openings extending from the interior of said bowl to said first space, and said second group of liquid discharge openings extending from the interior of said bowl to said annular zone.
  • a three-phase centrifuge according to claim in which said base portion includes a radially inwardly extending rim defining an annular channel between said base portion and said other end, said annular channel being disposed adjacent said first group ofliquid discharge openings.
  • an elongated hollow bowl of circular cross section mounted for rotation about an axis, said bowl having an inner annular surface with a portion thereof decreasing in diameter approaching one end of said bowl, said bowl having a solids discharge opening disposed at said one end, the other end of said bowl having disposed therein a first group of liquid discharge openings for discharge of the first liquid, and a second group of liquid discharge openings for discharge of the second liquid, said second group of liquid discharge openings opening into the interior of said bowl at said other end at a lesser distance from the axis of rotation than said first group of liquid discharge openings;
  • annular ring dam means mounted adjacent said second group of liquid discharge openings, said ring darn means serving as a weir over which said second liquid flows upon being discharged;
  • a screw conveyor disposed within said bowl and mounted for coaxial rotation therein, said conveyor including an axially elongated hub radially spaced from said bowl to define therewith an annular separating chamber, flights mounted on said hub for movement therewith, said flights having their distal edges generally complementing the inside contour of said bowl;
  • feed means having an outlet, said outlet being positioned between said one end and said other end of said bowl, said outlet being adapted to introduce said feed into said separating chamber;
  • annular channel on the exterior of said other end adjacent to said first group of liquid discharge openings, said annular channel opening in an inward direction and being adapted to receive said first liquid discharged through said first group of liquid discharge openings, and further including a skimmer tube having an inlet for receiving said first liquid from said channel, said inlet being disposed within said channel.
  • an elongated hollow bowl of circular cross section mounted for rotation about an axis, said bowl having an inner annular surface with a portion thereof decreasing in diameter approaching one end of said bowl, said bowl having a solids discharge opening disposed at said one end, the other end of said bowl having disposed therein a first group of liquid discharge openings for discharge of the first liquid, and a second group of liquid discharge openings for discharge of the second liquid, said second group of liquid discharge openings opening into the interior of said bowl at said other end at a lesser distance from the axis of rotation than said first group of liquid discharge openings;
  • b means defining an annular channel on the exterior of said other end adjacent said first group of liquid discharge openings, said annular channel being adapted to receive said first liquid discharged through said first group of liquid discharge openings and further including a skimmer tube having an inlet for receiving said first liquid from said annular channel, said inlet being disposed within said channel;
  • a screw conveyor disposed within said bowl and mounted for coaxial rotation therein, said conveyor including an axially elongated hub radially spaced from said bowl to define therewith an annular separating chamber, flights mounted on said hub for movement therewith, said flights having their distal edges generally complementing the inside contour of said bowl;
  • feed means having an outlet, said outlet being positioned between said one end and said other end of said bowl, said outlet being adapted to introduce said feed into said separating chamber.
  • an elongated hollow bowl of circular cross section mounted for rotation about an axis, said bowl having an inner annular surface with a portion thereof decreasing in diameter approaching one end of said bowl, said bowl having a solids discharge opening disposed at said one end, the other end of said bowl having disposed therein a first group of liquid discharge openings for discharge of the first liquid, and a second group of liquid discharge openings for discharge of the second liquid, said second group of liquid discharge openings opening into the interior of said bowl at said other end at a lesser distance from the axis of rotation than said first group of liquid discharge openings;
  • annular ring dam means mounted adjacent said second group of liquid discharge openings, said ring dam means serving as a weir over which said second liquid flows upon being discharged;
  • a screw conveyor disposed within said bowl and mounted for coaxial rotation therein, said conveyor including an axially elongated hub radially spaced from said bowl to define therewith an annular separating chamber, flights mounted on said hub for movement therewith, said flights having their distal edges generally complementing the inside contour of said bowl;
  • feed means having an outlet, said outlet being positioned between said one end and said other end of said bowl, said outlet being adapted to introduce said feed into said separating chamber;
  • annular underdam ring means mounted adjacent said first group of liquid discharge openings, said annular underdam ring means being adapted to prevent discharge of said second liquid through said first group of liquid discharge openings.
  • an elongated hollow bowl of circular cross section mounted for rotation about an axis
  • said bowl having an a. an elongated hollow bowl of circular cross section mounted for rotation about an axis, said bowl having an inner annular surface with a portion thereof decreasing in inner annular surface with a portion thereof decreasing in diameter approaching one end of said bowl, said bowl having a solids discharge opening disposed at said one diameter approaching one end of said bowl, said bowl end, the other s q a bowl as p therein 3 having a solids discharge opening disposed at said one groul?
  • a screw conveyor disposed within said bowl and mounted tovmgfm over when Sam second flows upon for coaxial rotation therein, said conveyor including an bemg dlscharged; axially elongated hub radially spaced from said bowl to c a screw conveyor disposed within said bowl and mounted d fi therewith an lar separating chamber, flights for coaxial rotation therein, said conveyor including an mounted on Said hub for movement (herewim Said flights axially elongated hub radially Spaced fmm Said bowl to having their distal edges generally complementing the indefine therewith an annular separating chamber, flights side contour f id bOW]; mounted Said hub for movement therewith, Said flights d.
  • feed means having an outlet, said outlet being positioned having heir is l ge genera y comp e en g the between said one end and said other end of said bowl, Side COHIOUI OfSaid bowl; said outlet being adapted to introduce said feed into said d. feed means having an outlet, said outlet being positioned separating chamber;
  • a scraper member mounted adjacent the distal edges of said outlet being adapted to introduce said feed into said one of said flights, said scraper member being disposed separating chamber; adgacent said inner annular surface, and adjacent said e. radially extending rib means mounted adjacent to said h er end of i bowl! f adapted to rotate about Sald end, Said radially exmnding rib means being axis upon rotation of said screw conveyor to remove acadapted to control the rotational velocity of one of said cumulanons of Sohds on Sald mner annular surface liquids with respect to said bowl.

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  • Centrifugal Separators (AREA)
US7285A 1970-01-30 1970-01-30 Three-phase centrifuge Expired - Lifetime US3623656A (en)

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US (1) US3623656A (enrdf_load_stackoverflow)
JP (1) JPS497540B1 (enrdf_load_stackoverflow)
CA (1) CA921887A (enrdf_load_stackoverflow)
DE (1) DE2103829A1 (enrdf_load_stackoverflow)
FR (1) FR2123213B1 (enrdf_load_stackoverflow)
GB (1) GB1283883A (enrdf_load_stackoverflow)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880346A (en) * 1974-03-25 1975-04-29 Baker Perkins Inc Centrifuge with mechanism for inhibiting the migration of separated air-entrained solids
US3905546A (en) * 1973-07-10 1975-09-16 Pavel Semenovich Vlasov Centrifugal extractor
US3968929A (en) * 1974-04-22 1976-07-13 Titan Separator A/S Centrifuge
EP0015210A1 (fr) * 1979-02-23 1980-09-03 Pierre Laurent Saget Appareil perfectionné pour la séparation centrifuge d'au moins deux phases liquides et une phase sédimentaire d'un mélange
US4313559A (en) * 1979-01-17 1982-02-02 Westfalia Separator Ag Fully jacketed helical centrifuge
US4362620A (en) * 1979-03-15 1982-12-07 High Robert E Partitioned centrifuge
US4464162A (en) * 1983-03-24 1984-08-07 Bird Machine Company, Inc. Centrifugal separator
US4575370A (en) * 1984-11-15 1986-03-11 Pennwalt Corporation Centrifuge employing variable height discharge weir
US4950219A (en) * 1988-10-20 1990-08-21 Alfa-Laval Ab Adjustable weir structure for a decanter centrifuge
US5147277A (en) * 1991-03-19 1992-09-15 Baker Hughes Incorporated Power-efficient liquid-solid separating centrifuge
US5310399A (en) * 1991-08-20 1994-05-10 Kotobuki Techrex Ltd. Sedimentation centrifuge containing screw conveyor with fins
US5314399A (en) * 1991-08-20 1994-05-24 Kotobuki Techrex Ltd. Sedimentation centrifuge with helical fins mounted on the screw conveyor
US5643169A (en) * 1995-06-06 1997-07-01 Baker Hughes Incorporated Decanter centrifuge with adjustable gate control
US5653674A (en) * 1996-03-27 1997-08-05 Baker Hughes Incorporated Decanter centrifuge with discharge opening adjustment control and associated method of operating
US5695442A (en) * 1995-06-06 1997-12-09 Baker Hughes Incorporated Decanter centrifuge and associated method for producing cake with reduced moisture content and high throughput
US5944648A (en) * 1996-10-15 1999-08-31 Cornay; Paul J. Concentric tubular centrifuge
US6572524B1 (en) * 2000-07-14 2003-06-03 Alfa Laval Inc. Decanter centrifuge having a heavy phase solids baffle
US20040142807A1 (en) * 1997-10-14 2004-07-22 Cornay Paul J. Concentric tubular centrifuge
US6808481B1 (en) 1996-10-15 2004-10-26 Erth Technologies, Inc. Concentric tubular centrifuge
US6860845B1 (en) 1999-07-14 2005-03-01 Neal J. Miller System and process for separating multi phase mixtures using three phase centrifuge and fuzzy logic
US20050054507A1 (en) * 1996-10-15 2005-03-10 Cornay Paul J. Concentric tubular centrifuge
US20050197241A1 (en) * 2004-03-04 2005-09-08 Hutchison Hayes L.P. Three Phase Decanter Centrifuge
US20060258522A1 (en) * 2003-08-30 2006-11-16 Cornay Paul J Centrifuge
DE102005027553A1 (de) * 2005-06-14 2006-12-28 Westfalia Separator Ag Drei-Phasen-Vollmantel-Schneckenzentrifuge und Verfahren zur Regelung des Trennprozesses
DK178253B1 (en) * 2010-11-12 2015-10-12 Alfa Laval Corp Ab A centrifugal separator and an outlet element for a centrifugal separator
CN111195567A (zh) * 2020-01-08 2020-05-26 苏州瑞威离心分离技术有限公司 一种小麦淀粉三相卧螺离心机

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR205952A1 (es) * 1975-01-03 1976-06-15 Pennwalt Corp Una centrifuga decantadora
DE2701763C3 (de) * 1977-01-18 1979-11-15 Westfalia Separator Ag, 4740 Oelde Kontinuierlich arbeitender Vollmantel-Gegenstrom-Zentrifugalextraktor
DE2707111C3 (de) * 1977-02-18 1979-08-23 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co Kg, 8313 Vilsbiburg Vollmantel-Schneckenzentrifuge zur Trennung eines Feststoff-Flüssigkeitsgemisches
FR2452323B1 (fr) * 1979-03-28 1986-05-09 Pujol Andre Perfectionnements apportes aux centrifugeuse a extraction continue
GB8328894D0 (en) * 1983-10-28 1983-11-30 Broadbent & Sons Ltd Thomas Decanting type centrifuges
DE4041868C2 (de) * 1990-12-27 1998-07-30 Deutz Ag Zentrifuge
DE4201427A1 (de) * 1992-01-21 1993-07-22 Westfalia Separator Ag Vollmantelschneckenzentrifuge
ITMI20070345A1 (it) * 2007-02-22 2008-08-23 Nuova Maip Macchine Agricole Industriali Procedimento e apparecchiatura per la separazione e l'estrazione di differenti prodotti di paste di oleaginose e simili
JP2012000591A (ja) * 2010-06-18 2012-01-05 Ihi Corp デカンタ型遠心分離機
ES2899382T3 (es) 2019-05-16 2022-03-11 Alfa Laval Corp Ab Elemento de descarga de líquido de fase pesada para un separador centrífugo, separador centrífugo y método para separar dos fases líquidas

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US1572299A (en) * 1923-06-18 1926-02-09 Fred W Mcentire Centrifugal separator
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US2054058A (en) * 1934-04-12 1936-09-08 Laughlin Filter Corp Centrifuge
US2528974A (en) * 1945-09-19 1950-11-07 Process Dev Company Method and apparatus for centrifugal separation
US2873064A (en) * 1954-05-13 1959-02-10 Diefenbach Attilio Centrifugal decanter with horizontal axis, separating drum and discharge of residuesby means of a scraper
US3098820A (en) * 1960-11-23 1963-07-23 Sharples Corp Centrifuge
GB998669A (en) * 1964-06-18 1965-07-21 Starcosa Gmbh Centrifugal separators
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US3279687A (en) * 1963-05-24 1966-10-18 Bird Machine Co Centrifuge
US3285507A (en) * 1964-12-02 1966-11-15 Pennsalt Chemicals Corp Screw-type solids discharge centrifuge having means to discharge light solids
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US1572299A (en) * 1923-06-18 1926-02-09 Fred W Mcentire Centrifugal separator
US1710316A (en) * 1927-03-29 1929-04-23 Laughlin Filter Corp Centrifugal machine
US2054058A (en) * 1934-04-12 1936-09-08 Laughlin Filter Corp Centrifuge
US2528974A (en) * 1945-09-19 1950-11-07 Process Dev Company Method and apparatus for centrifugal separation
US2873064A (en) * 1954-05-13 1959-02-10 Diefenbach Attilio Centrifugal decanter with horizontal axis, separating drum and discharge of residuesby means of a scraper
US3098820A (en) * 1960-11-23 1963-07-23 Sharples Corp Centrifuge
US3268159A (en) * 1962-10-16 1966-08-23 Voith Gmbh J M Centrifuge
US3279687A (en) * 1963-05-24 1966-10-18 Bird Machine Co Centrifuge
GB998669A (en) * 1964-06-18 1965-07-21 Starcosa Gmbh Centrifugal separators
US3321131A (en) * 1964-10-21 1967-05-23 Bird Machine Co Centrifuge
US3285507A (en) * 1964-12-02 1966-11-15 Pennsalt Chemicals Corp Screw-type solids discharge centrifuge having means to discharge light solids

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905546A (en) * 1973-07-10 1975-09-16 Pavel Semenovich Vlasov Centrifugal extractor
US3880346A (en) * 1974-03-25 1975-04-29 Baker Perkins Inc Centrifuge with mechanism for inhibiting the migration of separated air-entrained solids
US3968929A (en) * 1974-04-22 1976-07-13 Titan Separator A/S Centrifuge
US4313559A (en) * 1979-01-17 1982-02-02 Westfalia Separator Ag Fully jacketed helical centrifuge
EP0015210A1 (fr) * 1979-02-23 1980-09-03 Pierre Laurent Saget Appareil perfectionné pour la séparation centrifuge d'au moins deux phases liquides et une phase sédimentaire d'un mélange
FR2449467A1 (fr) * 1979-02-23 1980-09-19 Saget Pierre Procede et appareil perfectionne le mettant en oeuvre pour la separation centrifuge d'au moins deux phases liquides d'un melange
US4295600A (en) * 1979-02-23 1981-10-20 Saget Pierre Laurent Apparatus for the centrifugal separation of at least two liquid phases and one sedimentary phase of a mixture
US4362620A (en) * 1979-03-15 1982-12-07 High Robert E Partitioned centrifuge
US4464162A (en) * 1983-03-24 1984-08-07 Bird Machine Company, Inc. Centrifugal separator
US4575370A (en) * 1984-11-15 1986-03-11 Pennwalt Corporation Centrifuge employing variable height discharge weir
US4950219A (en) * 1988-10-20 1990-08-21 Alfa-Laval Ab Adjustable weir structure for a decanter centrifuge
US5147277A (en) * 1991-03-19 1992-09-15 Baker Hughes Incorporated Power-efficient liquid-solid separating centrifuge
US5310399A (en) * 1991-08-20 1994-05-10 Kotobuki Techrex Ltd. Sedimentation centrifuge containing screw conveyor with fins
US5314399A (en) * 1991-08-20 1994-05-24 Kotobuki Techrex Ltd. Sedimentation centrifuge with helical fins mounted on the screw conveyor
US5643169A (en) * 1995-06-06 1997-07-01 Baker Hughes Incorporated Decanter centrifuge with adjustable gate control
US5695442A (en) * 1995-06-06 1997-12-09 Baker Hughes Incorporated Decanter centrifuge and associated method for producing cake with reduced moisture content and high throughput
US5840007A (en) * 1995-06-06 1998-11-24 Baker Hughes Incorporated Decanter centrifuge for producing cake with reduced moisture content and high throughput
US6110096A (en) * 1995-06-06 2000-08-29 Baker Hughes Incorporated Decanter centrifuge for producing cake with reduced moisture content and high throughput
US5653674A (en) * 1996-03-27 1997-08-05 Baker Hughes Incorporated Decanter centrifuge with discharge opening adjustment control and associated method of operating
US5944648A (en) * 1996-10-15 1999-08-31 Cornay; Paul J. Concentric tubular centrifuge
US6142924A (en) * 1996-10-15 2000-11-07 Erth Llc Concentric tubular centrifuge
US6808481B1 (en) 1996-10-15 2004-10-26 Erth Technologies, Inc. Concentric tubular centrifuge
US20050054507A1 (en) * 1996-10-15 2005-03-10 Cornay Paul J. Concentric tubular centrifuge
US20040142807A1 (en) * 1997-10-14 2004-07-22 Cornay Paul J. Concentric tubular centrifuge
US7189196B2 (en) 1997-10-14 2007-03-13 Erth Technologies, Inc. Method of separating materials with a concentric tubular centrifuge
US6966874B2 (en) 1997-10-14 2005-11-22 Erth Technologies, Inc. Concentric tubular centrifuge
US6860845B1 (en) 1999-07-14 2005-03-01 Neal J. Miller System and process for separating multi phase mixtures using three phase centrifuge and fuzzy logic
US6572524B1 (en) * 2000-07-14 2003-06-03 Alfa Laval Inc. Decanter centrifuge having a heavy phase solids baffle
US20060258522A1 (en) * 2003-08-30 2006-11-16 Cornay Paul J Centrifuge
US7241256B2 (en) 2003-08-30 2007-07-10 Erth Technologies, Inc. Centrifuge
US20050197241A1 (en) * 2004-03-04 2005-09-08 Hutchison Hayes L.P. Three Phase Decanter Centrifuge
US7255670B2 (en) * 2004-03-04 2007-08-14 Hutchison Hayes, L.P. Three phase decanter centrifuge
DE102005027553A1 (de) * 2005-06-14 2006-12-28 Westfalia Separator Ag Drei-Phasen-Vollmantel-Schneckenzentrifuge und Verfahren zur Regelung des Trennprozesses
CN101203318B (zh) * 2005-06-14 2012-01-11 威斯特伐利亚分离器股份公司 三相全壳-螺旋离心分离机及其应用和运行分离机的方法
DK178253B1 (en) * 2010-11-12 2015-10-12 Alfa Laval Corp Ab A centrifugal separator and an outlet element for a centrifugal separator
US9579665B2 (en) 2010-11-12 2017-02-28 Alfa Laval Corporate Ab Centrifugal separator and an outlet element for a centrifugal separator
CN111195567A (zh) * 2020-01-08 2020-05-26 苏州瑞威离心分离技术有限公司 一种小麦淀粉三相卧螺离心机

Also Published As

Publication number Publication date
FR2123213A1 (enrdf_load_stackoverflow) 1972-09-08
CA921887A (en) 1973-02-27
GB1283883A (en) 1972-08-02
DE2103829A1 (de) 1971-08-05
JPS497540B1 (enrdf_load_stackoverflow) 1974-02-21
FR2123213B1 (enrdf_load_stackoverflow) 1973-05-11

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