WO2018163010A1 - Ensemble râteau en spirale pour épaississant/clarificateur - Google Patents

Ensemble râteau en spirale pour épaississant/clarificateur Download PDF

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Publication number
WO2018163010A1
WO2018163010A1 PCT/IB2018/051196 IB2018051196W WO2018163010A1 WO 2018163010 A1 WO2018163010 A1 WO 2018163010A1 IB 2018051196 W IB2018051196 W IB 2018051196W WO 2018163010 A1 WO2018163010 A1 WO 2018163010A1
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WO
WIPO (PCT)
Prior art keywords
spiral
plow
arm
connector
end portion
Prior art date
Application number
PCT/IB2018/051196
Other languages
English (en)
Inventor
Fred Schoenbrunn
Timothy J. Laros
Original Assignee
Flsmidth A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flsmidth A/S filed Critical Flsmidth A/S
Publication of WO2018163010A1 publication Critical patent/WO2018163010A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers

Definitions

  • Embodiments of the invention relate to equipment and processes for dewatering slurry.
  • embodiments of the invention relate to thickener/clarifier technology and industrial sedimentation. More particularly, embodiments of the invention relate to the advancement of spiral rake thickener technology.
  • Various techniques may be used in the separation of suspended solid particles from the liquid in which they are suspended. These techniques may include, for example, flotation, filtration, centrifugation, expression and sedimentation.
  • the technique of sedimentation includes introducing a slurry (i.e., a liquid containing suspended solid particles) into a settling tank or basin of, for example, a clarifier or thickener, and allowing the suspended solid particles to settle by gravity to form a sludge or thickened mud on the bottom of the tank and a clarified liquor at the top of the tank.
  • the sludge may then be collected and further processed or otherwise disposed of.
  • the supernatant liquid also referred to as the clarified liquor, may be collected for further processing or disposal, or possibly reused to assist in a similar separation process.
  • a feedwell may be positioned to receive the slurry as it is introduced into the settling tank.
  • a feedwell includes an area or compartment within the settling tank but which is separated from the contents of the settling tank.
  • the influent stream of slurry is then directed along a predetermined flow path to dissipate the kinetic energy associated with the flow of the influent stream of slurry. This is done so that the influent stream has reduced flow characteristics as it leaves the separated compartment and is intermixed with the contents of the settling tank.
  • the feedwell may be configured to control the distribution of the influent stream into the settling tank such that the influent stream is not introduced at a single location within the settling tank.
  • the feedwell reduces the velocity of the influent stream and provides increased distribution of the influent stream such that any associated turbulence, which would likely disrupt the sludge formed along the bottom of the settling tank, is reduced or eliminated.
  • a rake is used to encourage settled solids (i.e., sludge), which forms along the bottom of the tank, radially inwardly and towards a central lower opening, where it can be evacuated from the basin. After migrating towards the center of the thickener/clarifier device, the sludge may be removed via a center outlet of the settling tank via gravity or by a pump.
  • Various rake designs have been employed over the years and may include "DORR-type" blades mounted on a 4-arm rotating framework rake.
  • thickener/clarifiers can perform worse than smaller laboratory test units after the application of scale up calculations. Such underperformance in the field may be, at least in part, attributed to large distributions in mud residence times that can be seen with full-scale industrial-sized units.
  • thickener/clarifiers are generally designed so that settled mud flows and moves out of the thickener/clarifier's lower discharge by way of plug flow; wherein in theory, mud within the thickener/clarifier is supposed to thicken up evenly over a designed residence time.
  • thickener/clarifiers that provide broad residence time distributions (compared with an ideal plug flow model) may negatively result in both lower overall underflow density and higher exhibited torque.
  • an object of some embodiments of the present invention to provide an improved rake for a thickener/clarifier which may be adequately configured to encourage settled solids to migrate towards the center of a settling tank.
  • FIGS. 1-3 show various views of one preferred embodiment of a rake assembly 100, without limitation.
  • FIGS. 4-6 show various views of another preferred embodiment of a rake assembly 100, without limitation.
  • FIGS. 7 and 8 show two respective non-limiting exemplary cross-sectional views of a spiral-shaped curvilinear plow according to some embodiments.
  • FIGS. 9 and 10 show two respective non-limiting exemplary embodiments of a distal connection between an arm and a spiral-shaped curvilinear plow; wherein FIG. 9 shows a direct connection with little or no Z-axis vertical separation therebetween; and, wherein FIG. 10 shows an indirect connection with a Z-arm separating a distal end portion (B) of an arm from a distal end portion (B) of a spiral-shaped curvilinear plow.
  • FIG. 11 suggests how an aspect ratio of rake assembly features may change to accommodate shallower thickener/clarifiers as well as deeper paste cone thickeners, without limitation.
  • the rake assembly 100 may comprise a rake support assembly 80; a number of optional mounting members (e.g., an optional first mounting member 86, an optional second mounting member 86, an optional third mounting member, an optional fourth mounting member); a first arm 10; a fifth arm 11 ; a second arm 12; and a sixth arm 13 each extending radially outwardly from the rake support assembly 80.
  • a first spiral-shaped curvilinear plow 40 and a second spiral-shaped curvilinear plow 42 may extend radially outwardly away from the rake support assembly 80 in a curvilinear fashion as depicted in the figures.
  • a distal end portion (B) of the first spiral-shaped curvilinear plow 40 may be connected to the distal end portion (B) of the first arm 10, and the proximal end portion (A) of the first spiral-shaped curvilinear plow 40 may be connected to the rake support assembly 80, for example, via the optional first mounting member 86.
  • a distal end portion (B) of the second spiral- shaped curvilinear plow 42 may be connected to the distal end portion (B) of the second arm 12, and the proximal end portion (A) of the second spiral- shaped curvilinear plow 42 may be connected to the rake support assembly 80; for example, via the optional second mounting member 86.
  • the first spiral- shaped curvilinear plow 40 may be operatively connected to the fifth arm 11 via a first connector 50; the first spiral-shaped curvilinear plow 40 may be operatively connected to the second arm 12 via a second connector 60; and, the second spiral-shaped curvilinear plow 42 may be operatively connected to the sixth arm 13 via a third connector 52, without limitation.
  • At least one circumferential support member 30 may connect the first arm 10 to the fifth arm 11, without limitation. In some embodiments, the at least one circumferential support member 30 may connect the fifth arm 11 to the second arm 12, without limitation. In some embodiments, the at least one circumferential support member 30 may connect the second arm 12 to the sixth arm 13, without limitation. In some embodiments, the at least one circumferential support member 30 may be adapted to support tensile forces and/or adapted to support compressive forces, without limitation. In some embodiments, the first and second mounting members 86, if and where employed, may each comprise, for example, a short cantilevered arm extending radially outwardly from the rake support assembly 80.
  • first and second mounting members 86 may each comprise a proximal end portion (A) located proximate a radially inward end, and a distal end portion (B) located proximate a radially outward end.
  • connection means known in the art (e.g., bolting, welding, connectors, gussets, mounts, butt joint, flange, or the like, without limitation).
  • the rake assembly 100 may further comprise a third arm 14 extending radially outwardly from the rake support assembly 80.
  • the third arm 14 may have a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end.
  • the second spiral- shaped curvilinear plow 42 may be connected to the third arm 14 via a fourth connector 62.
  • the rake assembly 100 may comprise a seventh arm 15 extending radially outwardly from the rake support assembly 80 and also having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end, without limitation.
  • a third spiral-shaped curvilinear plow 44 may extend radially outwardly away from the rake support assembly 80 in a curvilinear fashion.
  • the third spiral-shaped curvilinear plow 44 may have a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end similar to the first 40 and second 42 spiral-shaped curvilinear plows.
  • a distal end portion (B) of the third spiral-shaped curvilinear plow 44 may be connected to the distal end portion (B) of the third arm 14.
  • a proximal end portion (A) of the third spiral-shaped curvilinear plow 44 may be connected to the rake support assembly 80; for example, via an optional third mounting member 86 of the rake support assembly 80.
  • the third spiral-shaped curvilinear plow 44 is operatively connected to the seventh arm 15 via a fifth connector 54.
  • the first connector 50 or the third connector 52 of the rake assembly 100 may be shorter in a vertical direction than the second connector 60.
  • both the first connector 50 and the third connector 52 may be shorter in the vertical direction than the second connector 60, without limitation.
  • the third connector 52 or the fifth connector 54 of the rake assembly 100 may be shorter in a vertical direction than the fourth connector 62.
  • both the third connector 52 and the fifth connector 54 may be shorter in the vertical direction than the fourth connector 62, without limitation.
  • the first connector 50, the third connector 52, and the fifth connector 54 may all be the same first length in the vertical direction, without limitation.
  • the second connector 60 and the fourth connector 62 may also be the same second length in the vertical direction.
  • the first length is less than the second length, without limitation.
  • the first 50, second 60, third 52, fourth 62, and fifth 54 connectors may each be generally vertically-oriented such that they are substantially parallel to a longitudinal axis 81 of the rake support assembly 80, without limitation.
  • the first spiral-shaped curvilinear plow 40 of the rake assembly 100 may be operatively connected to the sixth arm 13 via a sixth connector 70, without limitation.
  • the second spiral- shaped curvilinear plow 42 may be operatively connected to the seventh arm 15 via a seventh connector 72, without limitation.
  • Embodiments of a rake assembly 100 may further comprise a fourth arm 16 extending radially outwardly from the rake support assembly 80 and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end, without limitation.
  • the third spiral-shaped curvilinear plow 44 may be connected to the fourth arm 16 via an eighth connector 64.
  • the rake assembly 100 may also comprise an eighth arm 17 extending radially outwardly from the rake support assembly 80 and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end.
  • the third spiral-shaped curvilinear plow 44 may be connected to the eighth arm 17 via a ninth connector 74.
  • a fourth spiral-shaped curvilinear plow 46 may be provided and extend radially outwardly away from the rake support assembly 80 in a curvilinear fashion - having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end.
  • the distal end portion (B) of the fourth spiral-shaped curvilinear plow 46 may be connected to the distal end portion (B) of the fourth arm 16.
  • the proximal end portion (A) of the fourth spiral-shaped curvilinear plow 44 may be connected to the rake support assembly 80; for example; via an optional fourth mounting member 86 of the rake support assembly 80.
  • the fourth spiral-shaped curvilinear plow 46 may be operatively connected to the eighth arm 17 via a tenth connector 56, without limitation.
  • the fourth spiral-shaped curvilinear plow 46 may be operatively connected to the first arm 10 via an eleventh connector 66, without limitation.
  • the fourth spiral-shaped curvilinear plow 46 may be operatively connected to the fifth arm 11 via a twelfth connector 76, without limitation.
  • the first 50, third 52, fifth 54, and tenth 56 connectors of the rake assembly 100 may be positioned radially outwardly of the second 60, fourth 62, eighth 64, and eleventh 66 connectors, without limitation.
  • the second 60, fourth 62, eighth 64, and eleventh 66 connectors may be positioned radially outwardly of the sixth 70, seventh 72, ninth 74, and twelfth 76 connectors, without limitation.
  • the rake assembly 100 may comprise a fourth arm 16 extending radially outwardly from the rake support assembly 80.
  • the fourth arm 16 may have a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end, without limitation.
  • the rake assembly 100 may comprise an eighth arm 17 extending radially outwardly from the rake support assembly 80 and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end, without limitation.
  • a fourth spiral-shaped curvilinear plow 46 may be provided to the rake assembly 100; the fourth spiral-shaped curvilinear plow 46 extending radially outwardly away from the rake support assembly 80 in a curvilinear fashion and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end.
  • the distal end portion (B) of the fourth spiral-shaped curvilinear plow 46 may be connected to the distal end portion of the fourth arm 16.
  • the proximal end portion (A) of the fourth spiral-shaped curvilinear plow 46 may be connected to a fourth mounting member 86 of the rake support assembly 80, without limitation.
  • the third spiral- shaped curvilinear plow 44 may be operatively connected to the fourth arm 16 via an eighth connector 64, without limitation.
  • the fourth spiral-shaped curvilinear plow 46 may be operatively connected to the eighth arm 17 via a tenth connector 56, without limitation.
  • the fourth spiral-shaped curvilinear plow 46 may be operatively connected to the first arm 10 via an eleventh connector 66, without limitation.
  • the first 50, third 52, fifth 54, and tenth 56 connectors of the rake assembly 100 may be positioned radially outwardly of the second 60, fourth 62, eighth 64, and eleventh 66 connectors, without limitation.
  • Embodiments of the rake assembly 100 may comprise a fifth spiral-shaped curvilinear plow 41 extending radially outwardly from the rake support assembly 80 in a curvilinear fashion and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end; wherein the distal end portion (B) of the fifth spiral-shaped curvilinear plow 41 may be connected to the distal end portion of the fifth arm 11.
  • a fifth spiral-shaped curvilinear plow 41 may be provided between a first spiral-shaped curvilinear plow 40 and a second spiral-shaped curvilinear plow 42, without limitation.
  • Embodiments of the rake assembly 100 may comprise a sixth spiral-shaped curvilinear plow 43 extending radially outwardly away from the rake support assembly 80 in a curvilinear fashion and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end; wherein the distal end portion (B) of the sixth spiral-shaped curvilinear plow 43 is connected to the distal end portion of the sixth arm 13.
  • a sixth spiral-shaped curvilinear plow 43 may be provided between a second spiral-shaped curvilinear plow 42 and a third spiral-shaped curvilinear plow 44, without limitation.
  • Embodiments of the rake assembly 100 may comprise a seventh spiral-shaped curvilinear plow 45 extending radially outwardly away from the rake support assembly 80 in a curvilinear fashion and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end; wherein the distal end portion (B) of the seventh spiral-shaped curvilinear plow 45 is connected to the distal end portion of the seventh arm 15.
  • a seventh spiral-shaped curvilinear plow 45 may be provided between a third spiral-shaped curvilinear plow 44 and a fourth spiral-shaped curvilinear plow 46, without limitation.
  • Embodiments of the rake assembly 100 may comprise an eighth spiral-shaped curvilinear plow 47 extending radially outwardly away from the rake support assembly 80 in a curvilinear fashion and having a proximal end portion (A) located proximate its radially inward end, and a distal end portion (B) located proximate its radially outward end; wherein the distal end portion (B) of the eighth spiral-shaped curvilinear plow 47 is connected to the distal end portion of the eighth arm 17.
  • an eighth spiral-shaped curvilinear plow 47 may be provided between a fourth spiral-shaped curvilinear plow 46 and a first spiral-shaped curvilinear plow 40, without limitation.
  • the fifth spiral-shaped curvilinear plow 41 may be operatively connected to the second arm 12 via a thirteenth connector 51, without limitation. In some embodiments, the fifth spiral- shaped curvilinear plow 41 may be operatively connected to the sixth arm 13 via a seventeenth connector 61, without limitation. In some embodiments, the fifth spiral-shaped curvilinear plow 41 may be operatively connected to the third arm 14 via a twenty-first connector 71, without limitation.
  • the sixth spiral-shaped curvilinear plow 43 may be operatively connected to the third arm 14 via a fourteenth connector 53, without limitation. In some embodiments, the sixth spiral-shaped curvilinear plow 43 may be operatively connected to the seventh arm 15 via an eighteenth connector 63, without limitation. In some embodiments, the sixth spiral-shaped curvilinear plow 43 may be operatively connected to the fourth arm 16 via a twenty-second connector 73, without limitation.
  • the seventh spiral-shaped curvilinear plow 45 may be operatively connected to the fourth arm 16 via a fifteenth connector 55, without limitation. In some embodiments, the seventh spiral-shaped curvilinear plow 45 may be operatively connected to the eighth arm 17 via a nineteenth connector 65, without limitation. In some embodiments, the seventh spiral-shaped curvilinear plow 45 may be operatively connected to the first arm 10 via a twenty-third connector 75, without limitation.
  • the eighth spiral-shaped curvilinear plow 47 may be operatively connected to the first arm 10 via a sixteenth connector 57, without limitation. In some embodiments, the eighth spiral-shaped curvilinear plow 47 may be operatively connected to the fifth arm 11 via a twentieth connector 67, without limitation. In some embodiments, the eighth spiral-shaped curvilinear plow 47 may be operatively connected to the second arm 12 via a twenty-fourth connector 77, without limitation.
  • a proximal end portion (A) of the fifth 41, sixth 43, seventh 45, and/or eighth 47 spiral- shaped curvilinear plow 44 may be connected to the rake support assembly directly, or indirectly; for example; via respective optional mounting members 86 provided to the rake support assembly 80.
  • proximal end portions (A) of spiral-shaped curvilinear plows discussed herein may also be connected to each other; in particular, in embodiments where the rake support assembly 80 may not vertically extend below the arms.
  • the thickener/clarifier may comprise a rake support assembly 80.
  • the rake support assembly 80 may comprise a pillar, which may, as shown, comprise a number of first support members 82, for example, a number of vertically-oriented truss members, and a number of second support members 84, for example, a number of horizontally-oriented truss members or rings connecting parallel vertically-oriented truss members.
  • the rake support assembly 80 could, alternatively, compose a truss, a frame, or a hollow, tubular column (e.g., a pipe).
  • rake support assembly 80 may be fabricated from rolled or flat plates welded together, or a large pipe extrusion.
  • a rake support assembly 80 may be provided in the form of a rake shaft which is coupled to abridge extending over a thickener/clarifier, without limitation; and such embodiments would also fall within the scope of a rake support assembly 80 described herein.
  • the column may span between arms and spiral-shaped curvilinear plows; however, in some embodiments, the column may end at the arms - wherein proximal end portions (A) may join each other
  • a number of mounting members 86 may be provided to a lower portion of the rake support assembly 80.
  • the mounting members 86 may comprise horizontally-oriented, radially-extending, and/or cantilevered arms as shown.
  • the mounting members 86 if used, may serve to attach a proximal end portion (A) of a spiral-shaped curvilinear plow to the rake support assembly 80, such that the spiral-shaped curvilinear plow may extend radially outwardly to its distal end portion (B) adjacent to a perimeter or periphery of a thickener/clarifier (not shown).
  • Mounting members 86 may merely comprise a welded joint, a gusset, a bracket, a connection point, or an attachment point, without limitation. It is envisaged that spiral-shaped curvilinear plows discussed herein may alternatively be connected to an arm of a rake assembly at its proximal end portion (A), rather than to the rake support assembly 80, without limitation.
  • the rake assembly 100 may, as shown, comprise a first arm 10, a second arm 12, a third arm 14, and a fourth arm 16 each extending radially outwardly from the rake support assembly 80 and circumferentially-spaced from each other. As shown, circumferential spacing may be even-spacing, without limitation.
  • the rake assembly 100 may, as shown, comprise a fifth arm 11, a sixth arm 13, a seventh arm 15, and an eighth arm 17. As suggested in FIG. 1, the fifth 11, sixth 13, seventh 15, and eighth 17 arms may be interposed between the first 10, second 12, third 14, and fourth 14 arms, respectively. Moreover, as suggested in the embodiment of FIGS.
  • the fifth 11, sixth 13, seventh 15, and eighth 17 arms may be shorter than, and/or extend radially outwardly from the rake support assembly 8 for a distance which is less than the first 10, second 12, third 14, and fourth 14 arms, respectively.
  • arms 10, 11, 12, 13, 14, 15, 16, 17 may be of similar length, without limitation.
  • One or more circumferential support members 30 may extend between any of the arms 10, 11, 12, 13, 14, 15, 16, 17, and these circumferential support members 30 may comprise any structural element including, but not limited to, cables, trusses, rigid elongated members, bars, ties, straps, chains, or the like, without limitation.
  • the circumferential support members 30 are preferably able to support tensile load, but may also support compressive and torque loads as well, without limitation.
  • a number of connection points 20 may be located at junctions between an arm 10, 11, 12, 13, 14, 15, 16, 17 and its adjacent respective circumferential support member 30 as shown.
  • Connection points may be of the connector type which is suitable to connect arms 10, 11, 12, 13, 14, 15, 16, 17 to circumferential support members 30, and may include, without limitation, structural elements such as eyebolts, cable mounts, weld plates, turnbuckles, bolted connections, and/or the like.
  • the rake assembly 100 may comprise a first spiral-shaped curvilinear plow 40, a second spiral-shaped curvilinear plow 42, a third spiral-shaped curvilinear plow 44, and a fourth spiral-shaped curvilinear plow 46, without limitation.
  • a proximal end portion (A) of the first spiral-shaped curvilinear plow 40 may be directly attached to a rake support assembly 80, or to a rake support assembly 80 via a mounting member 86 which extends from the rake support assembly 80 at a different polar radial than the first arm 10 (e.g., 180 degrees opposite from each other as shown in the non-limiting FIGS.
  • a distal end portion (B) of the first spiral-shaped curvilinear plow 40 may extend to a distal outer radial portion of the first arm 10.
  • the distal end portion (B) of the first spiral-shaped curvilinear plow 40 may be connected directly or indirectly to the distal outer radial portion of the first arm 10, without limitation.
  • a distal end portion (B) of the second spiral-shaped curvilinear plow 42 may extend to a distal outer radial portion of the second arm 12; a distal end portion (B) of the third spiral-shaped curvilinear plow 44 may extend to a distal outer radial portion of the third arm 14, and a distal end portion (B) of fourth spiral-shaped curvilinear plow 46 may extend to a distal outer radial portion of the fourth arm 16.
  • a first connector 50 provided to an outer portion of the fifth arm 11 may be provided to support the first spiral-shaped curvilinear plow 40, without limitation.
  • a second connector 60 provided to a central portion of the second arm 12 may be provided to support the first spiral-shaped curvilinear plow 40, without limitation.
  • a sixth connector 70 may be provided to an inner portion of the sixth arm 13 in order to support the first spiral-shaped curvilinear plow 40, without limitation.
  • a third connector 52 provided to an outer portion of the sixth arm 13 may be provided to support the second spiral-shaped curvilinear plow 42, without limitation.
  • a fourth connector 62 provided to a central portion of the second arm 14 may be provided to support the second spiral-shaped curvilinear plow 42, without limitation.
  • a seventh connector 72 may be provided to an inner portion of the seventh arm 15 in order to support the second spiral-shaped curvilinear plow 42, without limitation.
  • a fifth connector 54 provided to an outer portion of the seventh arm 15 may be provided to support the third spiral-shaped curvilinear plow 44, without limitation.
  • an eighth connector 64 provided to a central portion of the fourth arm 14 may be provided to support the third spiral-shaped curvilinear plow 44, without limitation.
  • a ninth connector 74 may be provided to an inner portion of the eighth arm 17 in order to support the third spiral-shaped curvilinear plow 44, without limitation.
  • a tenth connector 56 provided to an outer portion of the eighth arm 17 may be provided to support the fourth spiral-shaped curvilinear plow 46, without limitation.
  • an eleventh connector 66 provided to a central portion of the first arm 10 may be provided to support the fourth spiral-shaped curvilinear plow 46, without limitation.
  • a twelfth connector 76 may be provided to an inner portion of the fifth arm 11 in order to support the fourth spiral-shaped curvilinear plow 46, without limitation. As suggested in the embodiment shown in FIGS.
  • the rake assembly 100 may comprise a fifth spiral-shaped curvilinear plow 41, a sixth spiral-shaped curvilinear plow 43, a seventh spiral-shaped curvilinear plow 45, and an eighth spiral-shaped curvilinear plow 47, without limitation.
  • a proximal end portion (A) of the fifth spiral-shaped curvilinear plow 41 may be directly attached to a rake support assembly 80, or to a rake support assembly 80 via to a mounting member 86 which extends from the rake support assembly 80 at a different polar radial than the fifth arm 11 (e.g., 180 degrees opposite from each other as shown in the non- limiting FIGS.
  • a distal end portion (B) of the fifth spiral-shaped curvilinear plow 41 may extend to a distal outer radial portion of the fifth arm 11.
  • the distal end portion (B) of the fifth spiral-shaped curvilinear plow 41 may be connected directly or indirectly to the distal outer radial portion of the fifth arm 11, without limitation. Similar to the fifth spiral-shaped curvilinear plow 41, and as shown in FIGS.
  • a distal end portion (B) of the sixth spiral- shaped curvilinear plow 43 may extend to a distal outer radial portion of the sixth arm 13; a distal end portion (B) of the seventh spiral-shaped curvilinear plow 45 may extend to a distal outer radial portion of the seventh arm 15, and a distal end portion (B) of eighth spiral-shaped curvilinear plow 47 may extend to a distal outer radial portion of the eighth arm 17.
  • a thirteenth connector 51 provided to an outer portion of the second arm 12 may be provided to support the fifth spiral-shaped curvilinear plow 41, without limitation.
  • a seventeenth connector 61 provided to a central portion of the sixth arm 13 may be provided to support the fifth spiral-shaped curvilinear plow 41, without limitation.
  • a twenty-first connector 71 may be provided to an inner portion of the third arm 14 in order to support the fifth spiral- shaped curvilinear plow 41, without limitation.
  • a fourteenth connector 53 provided to an outer portion of the third arm 14 may be provided to support the sixth spiral-shaped curvilinear plow 43, without limitation.
  • an eighteenth connector 63 provided to a central portion of the seventh arm 15 may be provided to support the sixth spiral-shaped curvilinear plow 43, without limitation.
  • a twenty-second connector 73 may be provided to an inner portion of the fourth arm 16 in order to support the sixth spiral-shaped curvilinear plow 43, without limitation.
  • a fifteenth connector 55 provided to an outer portion of the fourth arm 16 may be provided to support the seventh spiral-shaped curvilinear plow 45, without limitation.
  • a nineteenth connector 65 provided to a central portion of the eighth arm 17 may be provided to support the seventh spiral-shaped curvilinear plow 45, without limitation.
  • a twenty-third connector 75 may be provided to an inner portion of the first arm 10 in order to support the seventh spiral-shaped curvilinear plow 45, without limitation.
  • a sixteenth connector 57 provided to an outer portion of the first arm 10 may be provided to support the eighth spiral-shaped curvilinear plow 47, without limitation.
  • a twentieth connector 67 provided to a central portion of the fifth arm 11 may be provided to support the eighth spiral-shaped curvilinear plow 47, without limitation.
  • a twenty-fourth connector 77 may be provided to an inner portion of the second arm 12 in order to support the eighth spiral-shaped curvilinear plow 47, without limitation.
  • any spiral-shaped curvilinear plow 40' described herein may comprise a leading edge 40a' which is backed by a tubular support member 40b' in order to provide rigidity and/or strength.
  • the two may be joined together by fasteners or one or more welds 40c'.
  • FIG. 8 as depicted in the figure, any spiral-shaped curvilinear plow 40" described herein may comprise a leading edge 40a" which is backed by a tubular support member 40b" in order to provide rigidity and/or strength.
  • the two may be joined together by fasteners or one or more welds 40c', via one or more connecting members 40d" extending therebetween.
  • the provided non-limiting examples depicted are for illustrative purposes only.
  • distal end portions (B) of an arm 10 and its respective spiral-shaped curvilinear plow 40 may be closely arranged and connected together as shown in the non-limiting embodiment of FIG. 9.
  • distal end portions (B) of an arm and a spiral-shaped curvilinear plow 40 may be separated in a vertical direction (i.e., "Z-axis"), and operatively connected to each other, via a Z-arm, without limitation.
  • the Z-arm vertical extension member may allow some or all rake arms 10 to be lifted vertically out of denser settled solids and into clarified liquor - thereby reducing drag and torque needed to drive the spiral rake assembly.
  • the vertical distance of the Z-arm may be increased, in some embodiments, such that the arms 40 may be entirely displaced from all liquid-containing portions of a thickener/clarifier, further reducing drag and torque needed to drive the spiral rake assembly.
  • low aspect-ratio thickener/clarifiers and their respective rake assemblies 100 are shown as non-limiting exemplary embodiments in the figures.
  • a rake assembly 100 may be sized and/or shaped to any type of thickener/clarifier, including those having higher aspect ratios (i.e., "deeper” in the vertical direction), and those having a lower aspect ratio (i.e., “shallower” in the vertical direction).
  • any number of the features and/or components disclosed herein may be practiced with thickener/clarifiers having high aspect rations, such as deep cone paste thickeners and high density thickeners, without limitation.
  • a rake assembly 100 may comprise a ratio of height in the vertical direction to width (or diameter) in the horizontal direction, which is greater than what is shown. Accordingly, it is to be understood that the descriptions herein are proffered by way of example to facilitate comprehension of the invention and should not be construed to limit the scope thereof.
  • Rake Support Assembly e.g., rotating cage, column, tube, pole, shaft, or the like
  • Longitudinal Axis e.g., axis of rake support assembly 80
  • First Support Member e.g., vertically-oriented truss members
  • Second Support Member e.g., horizontally-oriented truss members
  • Mounting Member e.g., horizontally-oriented, radially-extending, cantilevered arms
  • Rake Assembly (e.g., for a thickener/clarifier)

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention concerne un ensemble râteau (100) destiné à un épaississant/clarificateur et pouvant comprendre un ensemble support de râteau (80) ; un premier bras (10) ; un cinquième bras (11) ; un deuxième bras (12) ; et un sixième bras (13) s'étendant chacun radialement vers l'extérieur à partir de l'ensemble support de râteau (80). Un premier soc curviligne en forme de spirale (40) et un second soc curviligne en forme de spirale (42) peuvent s'étendre radialement vers l'extérieur à l'opposé de l'ensemble support de râteau (80) de manière curviligne. Une partie d'extrémité distale (B) du premier soc curviligne en forme de spirale (40) peut être reliée à la partie d'extrémité distale (B) du premier bras (10), et la partie d'extrémité proximale (A) du premier soc curviligne en forme de spirale (40) peut être reliée à l'ensemble support de râteau (80).
PCT/IB2018/051196 2017-03-06 2018-02-26 Ensemble râteau en spirale pour épaississant/clarificateur WO2018163010A1 (fr)

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US201762467711P 2017-03-06 2017-03-06
US62/467,711 2017-03-06

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR653603A (fr) * 1928-04-30 1929-03-23 épaississeur de matières impalpables
US1960707A (en) 1931-04-20 1934-05-29 Denver Equip Co Thickener
US2126884A (en) * 1936-05-02 1938-08-16 Hardinge Co Inc Sedimentation apparatus
US2528051A (en) 1946-08-06 1950-10-31 Dorr Co Sedimentation apparatus
US2589298A (en) 1946-12-28 1952-03-18 Dorr Co Sedimentation unit
US2724506A (en) * 1951-02-17 1955-11-22 Hardinge Co Inc Sediment and agitating apparatus and the like
DE2804554A1 (de) * 1978-02-03 1979-08-09 Zenith Maschf Gmbh Raeumerbruecke mit einer schwimmschlamm- abzugvorrichtung fuer klaeranlagen
EP0629423A1 (fr) 1993-05-27 1994-12-21 Coöperatieve Verkoop- en Productievereniging van Aardappelmeel en Derivaten 'AVEBE' B.A. Procédé et dispositif pour la séparation de particules solides d'un liquide en formant une suspension tampon
US5435924A (en) 1994-02-16 1995-07-25 Albertson; Orris E. Sludge collection apparatus and method
WO2004033063A2 (fr) 2002-10-08 2004-04-22 M-I L.L.C. Reservoir de clarification

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR653603A (fr) * 1928-04-30 1929-03-23 épaississeur de matières impalpables
US1960707A (en) 1931-04-20 1934-05-29 Denver Equip Co Thickener
US2126884A (en) * 1936-05-02 1938-08-16 Hardinge Co Inc Sedimentation apparatus
US2528051A (en) 1946-08-06 1950-10-31 Dorr Co Sedimentation apparatus
US2589298A (en) 1946-12-28 1952-03-18 Dorr Co Sedimentation unit
US2724506A (en) * 1951-02-17 1955-11-22 Hardinge Co Inc Sediment and agitating apparatus and the like
DE2804554A1 (de) * 1978-02-03 1979-08-09 Zenith Maschf Gmbh Raeumerbruecke mit einer schwimmschlamm- abzugvorrichtung fuer klaeranlagen
EP0629423A1 (fr) 1993-05-27 1994-12-21 Coöperatieve Verkoop- en Productievereniging van Aardappelmeel en Derivaten 'AVEBE' B.A. Procédé et dispositif pour la séparation de particules solides d'un liquide en formant une suspension tampon
US5435924A (en) 1994-02-16 1995-07-25 Albertson; Orris E. Sludge collection apparatus and method
WO2004033063A2 (fr) 2002-10-08 2004-04-22 M-I L.L.C. Reservoir de clarification

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Improved Spiral Rake Thickeners", DENVER, article "chapter 15", pages: 14
"Taggart Handbook of Mineral Dressing - Ores and Industrial Materials College Edition - Wiley Handbook Series", 1945, JOHN WILEY & SONS INC.

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