US3730769A - Method and apparatus for processing soluble crystals - Google Patents

Method and apparatus for processing soluble crystals Download PDF

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Publication number
US3730769A
US3730769A US00147128A US3730769DA US3730769A US 3730769 A US3730769 A US 3730769A US 00147128 A US00147128 A US 00147128A US 3730769D A US3730769D A US 3730769DA US 3730769 A US3730769 A US 3730769A
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United States
Prior art keywords
crystals
liquid
receiver
drum
outlet
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US00147128A
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English (en)
Inventor
B Fiedler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAFTUNG FRIED KRUPP 4300 ESSEN 1 GERMANY GmbH
BWS Technologie GmbH
Original Assignee
Maschinenfabrik Buckau R Wolf AG
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Publication of US3730769A publication Critical patent/US3730769A/en
Assigned to HAFTUNG, FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER, 4300 ESSEN 1, GERMANY reassignment HAFTUNG, FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER, 4300 ESSEN 1, GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUKAU-WALTHER AKTIENGESELLSCHAFT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/04—Casings facilitating discharge

Definitions

  • the crystals are ejected through an outlet of the drum into a receiver of annular configuration and tubular cross-section, having a circumferential slot through which the crystals are ejected into it.
  • a liquid in which the crystals are soluble is contained in the receiver and rotates at a second peripheral speed which is smaller than the peripheral speed of the centrifuge drum.
  • the present invention relates generally to the treatment of soluble crystals, and more particularly to a method for treating soluble crystals, especially sugar crystals, and to an apparatus for carrying out the method.
  • Such intermediate or semi-finished products as B-sugar as well as the affinades have a tendency-especially on ejection from the centrifugeto cake and form knots or walls, as a result of the high ejection speed and the residual syrup film which adheres to the crystals.
  • the crystals which impinge at the wall of the centrifuge housing at high speed tend to cake on this wall and to build up a deposit or layer which in turn eventually clogs the outlet housing and makes it necessary again and again to clean the centrifuge in a time-consuming manner. This, of course, necessitates that the centrifuge be shut down so that continuous operation is not possible.
  • magma refers to an artificial filling mass which can be used in various ways known to those skilled in the art.
  • a concomitant object of the invention is to provide an apparatus for carrying out the method.
  • one feature of the invention resides in my novel method according to which soluble crystals are treated in a centrifuge drum which rotates at a first peripheral speed.
  • the crystals are ejected through an outlet of a drum into a'receiver containing a liquid in which the crystals are soluble, and the liquid is rotated in the receiver at a second peripheral speed which is smaller than the first peripheral speed of the drum.
  • the contents of the receiver can be supplied without any difficulties and with the simplest of conveying meansfor instance a conduit with an interposed pumpfrom the receiver to the cooking or boiling stations, or to other stations where they undergo different and further processing. It is also no longer necessary to provide special vessels for dissolving the crystals nor to provide special vessels for forming a mash.
  • the present invention causes the body of liquid to rotate in a stationary annular member, with the rotation of the body of liquid being caused only by the air friction resulting at the outlet flange of the centrifuge drum. It is possible to influence the rotation of the body of liquid by having the outlet flange enter into the body of liquid to a greater or lesser degree. However, under all circumstances the body of liquid will rotate at a peripheral speed which is lower than that of the centrifuge drum itself, so that a dissolution and/or formation of mash of the crystals in the body of liquid can readily take place.
  • FIG. 1 is a section taken on line 1-1 of FIG. 2 illustrating an apparatus for carrying out the present invention
  • FIG. 2 is a plane view of the centrifuge drum of the apparatus in FIG. 1;
  • FIG. 3 is a section taken on line III-III of FIG. 2 with the outlet flange extended;
  • FIG. 4 is asection taken on line III--HI of FIG. 2, but illustrating an arrangement of supplementary nozzles.
  • FIG. 5 is a section on line III-III of FIG. 2 illustrating a rotating-liquid chamber.
  • centrifuge drum 1- which may be driven in entirely conventional manner and with conventional means well known to those skilled in the artis of conical configuration and identified with reference numeral 1. It diverages in upward direction, being mounted so that its outlet end is located at the upper side. At its outlet end the drum has an outlet or discharge flange 2 which exends into an annular slot 5 formed in the wall of a tubular cross-section receiver 4 which is of annular configuration and is stationaril'y mounted.
  • the slot '5 is delimited in this embodiment by collecting baffles 7 and 8 which extend in parallelism with one another and which extend inwardly and outwardly beyond the edges bounding the slot 5.
  • the baffles 7 and 8, and especially those portions which extend into the interior of the element 4, are necessary to prevent the ring or body of liquid 6 which rotates in the interior of the element 4, from being expelled through the slot 5.
  • the centrifuge 1 rotates at high speed, as is conventionally known to those skilled in the art. Because of this high speed the flange 2 extending through the slot 5 into the interior of the element 4 causes within the latter a turbulence, with the resulting air friction effecting rotation of the body 6 about the axis of the annular element 4. Because of the fritcion of the liquid of the body 6 with the inner wall of the element 4, however, the peripheral speed at which the body 6 rotates is lower than the peripheral speed at which the flange 2 itself rotates with the drum 1.
  • FIG. 2 I have illustrated one possiblility for supplying the liquid into the interior of the element 4, that is the liquid which is required for forming the ringshaped body 6 therein.
  • a plurality of inlet nipples 9, 10 and 11 which are arranged tangentially at the outer periphery of the element 4 and connected with non-illustrated supply conduits through which the liquid is supplied.
  • FIG. 4 I have illustrated an embodiment which is ditferent in that supplementary nozzles 13 are provided which are connected with an annular supply conduit 14 beneath a cover plate 3. These nozzles 13 eject jets 18 of liquid which are ejected into the interior of the centrifuge drum. The same result is obtained when the nozzles 13 are arranged above the plate 3 and when the jets 13 are directly aimed into the interior of the element 4 through the slot 5.
  • the nozzles 13 may be utilized by 4 themselves, or they may be used in conjunction with the nipples 9-11 if desired.
  • the nozzles 13, and/or the nipples 9-11 may extend radially or tangentially with reference to the circumference of the element 4, or they may have radial and tangential components of orientation.
  • FIG. 5 I have illustrated an embodiment in which there is secured to the lower side of the flange 3 a chamber 15 which rotates with the flange 2 and into which a stationary conduit 17 discharges liquid for forming the annular body 6.
  • the liquid introduced into the chamber 15 will flow-as a result of the rotation of the chamber-- in upward direction along the outer chamber wall 19 and then issues via bores 16 in the flange 2 into the annular slot 5 and through the same into the interior of the element 4.
  • the chamber 15 can be used by itself, or can be used in combination with the nipples 911 and conceivably also either with the nozzles 13 alone or with those in combination with the nipples 9-11.
  • the sugar crystals which have been separated from the liquid of the suspension by centrifuging in the drum 1 rise along the inner surface of the Wall of the drum, leaving the drum through the annular gap 20. From there the sugar crystals pass via the flange 2 into the interior of the element 4 where they are intercepted by the surface of the rotating body of liquid 6. As a result of this the sugar becomes either dissolved or forms a mash.
  • magma matrix or clearing liquor (the difference depends upon whether the crystals are dissolved or become converted into mash) passes via the outlet nipple 12 into a non-illustrated conduit or conduit systems to be carried away for further processing or storage.
  • the outlet nipple 12 may be located above the central axes of the element 4, to assure that only fully dissolved crystals (or crystals which have fully undergone the mash-making process) will leave the outlet nipple 12 as overflow.
  • Suitable throttling elements such as flap valves or other types of valves of known construction, may be provided in the conduits which communicate with and receive liquid from the outlet nipple 12, in order to influence the flow of the liquid leaving the component 4 through the outlet nipple 12.
  • FIGS. 3 and 5 A comparison of FIGS. 3 and 5 will indicate that the flange 2 may extend to a greater or lesser depth into the interior of the component or element 4 through the gap 5, whereby the rotation of the body of liquid 6 therein is influenced, that is if the flange 2 extends deeper into the interior of the element 4, the body of liquid will rotate at higher circumferential or peripheral speed. A quantity of the liquid withdrawn from the body 6 can be recirculated in order to thereby influence the viscosity'of the body 6.
  • a method of processing soluble crystals particularly sugar crystals the steps of treating soluble crystals in a centrifuge drum rotating at a first peripheral speed; ejecting the crystals through an outlet of the drum into a receiver containing a liquid in which said crystals are soluble; and rotating the liquid in said receiver at a second peripheral speed which is smaller than said first peripheral speed.
  • a continuously rotatable centrifuge drum having an outlet for ejection of soluble crystals which have been separated in said drum from a liquid in which they were suspended, and a flange surrounding the outlet; and an annular receiver of tubular cross-section surrounding said outlet and having a circumferential slot into which said flange extends, said receiver being adapted to contain a revolving body of liquid which rotates at lower speed than the drum and in which the ejected crystals are soluble.
  • said slot being bounded by transversely spaced edge portions; and further comprising baflle members provided on said edge portions for preventing the escape of matter entering said slot from said outlet.
  • baflle members extend in at least substantial parallelism with one another and with at least a portion of said flange.
  • said inlet means comprising a plurality of circumferentially distributed inlets.
  • said inlet means comprising as annular liquid chamber below said flange and rotatable with said drum, said flange comprising a plurality of axial bores communicating with said chamber.
  • said inlet means comprising a plurality of inlet nozzles separate from said receiver and located on an annular line having a smaller diameter than said receiver.
  • said nozzles being oriented so as to discharge into said annular slot.
  • a continuously rotatable centrifuge drum having an outlet; a flange surrounding said outlet; an annular receiver of tubular crosssection surrounding said flange and having a circumferential slot adapted to receive matter from said outlet; and a revolving body of liquid operative for dissolving said crystals, accommodated in said receiver.

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  • Centrifugal Separators (AREA)
US00147128A 1970-05-27 1971-05-26 Method and apparatus for processing soluble crystals Expired - Lifetime US3730769A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2025828A DE2025828C3 (de) 1970-05-27 1970-05-27 Kontinuierlich arbeitende Zentrifuge, insbes. Zuckerzentrifuge

Publications (1)

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US3730769A true US3730769A (en) 1973-05-01

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ID=5772196

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US00147128A Expired - Lifetime US3730769A (en) 1970-05-27 1971-05-26 Method and apparatus for processing soluble crystals

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US (1) US3730769A (de)
DE (1) DE2025828C3 (de)
FR (1) FR2097793A5 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960318A (en) * 1973-10-01 1976-06-01 Alfa-Laval Ab Centrifugal separator
US4008098A (en) * 1974-11-11 1977-02-15 Braunschweigische Maschinenbauanstalt Process and apparatus for continuously producing a high concentration sugar solution
US4405265A (en) * 1981-03-18 1983-09-20 Beloit Corporation Method and apparatus for the continuous transfer of particulates from a liquid conveying medium to a gaseous conveying medium
US5114489A (en) * 1990-11-29 1992-05-19 Silver Engineering Works, Inc. Means for producing a high brix sugar liquid
US5196068A (en) * 1990-11-29 1993-03-23 Silver Engineering Works, Inc. Means for producing a high brix lump-free magma

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2560226C2 (de) * 1975-11-11 1982-06-16 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Verfahren und Vorrichtung zur Regelung der Konzentration von in einer Auflösezentrifuge erzeugter Zuckerlösung
DE2749284A1 (de) * 1977-11-03 1979-05-10 Salzgitter Maschinen Ag Kontinuierlich arbeitende loesezentrifuge
DE2803160C3 (de) * 1978-01-25 1982-12-09 Braunschweigische Maschinenbauanstalt, 3300 Braunschweig Kontinuierlich arbeitende Zentrifuge
DE2849927B2 (de) * 1978-11-17 1980-11-27 Maschinenfabrik Buckau R. Wolf Ag, 4048 Grevenbroich Kontinuierlich arbeitende Zucker-Zentrifuge mit einer Einmaischvorrichtung
DE3622959C2 (de) * 1986-07-09 1996-12-12 Dorr Oliver Deutschland Kontinuierlich arbeitende Siebzentrifuge mit obenliegendem Antrieb
DE3633890A1 (de) * 1986-10-04 1988-04-07 Braunschweigische Masch Bau Kontinuierlich arbeitende zuckerzentrifuge
DE4238568A1 (de) * 1992-11-16 1994-05-19 Siteg Siebtech Gmbh Zentrifuge für die Feststoff-Flüssigkeits-Trennung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960318A (en) * 1973-10-01 1976-06-01 Alfa-Laval Ab Centrifugal separator
US4008098A (en) * 1974-11-11 1977-02-15 Braunschweigische Maschinenbauanstalt Process and apparatus for continuously producing a high concentration sugar solution
US4405265A (en) * 1981-03-18 1983-09-20 Beloit Corporation Method and apparatus for the continuous transfer of particulates from a liquid conveying medium to a gaseous conveying medium
US5114489A (en) * 1990-11-29 1992-05-19 Silver Engineering Works, Inc. Means for producing a high brix sugar liquid
US5196068A (en) * 1990-11-29 1993-03-23 Silver Engineering Works, Inc. Means for producing a high brix lump-free magma

Also Published As

Publication number Publication date
FR2097793A5 (de) 1972-03-03
DE2025828B2 (de) 1973-08-09
DE2025828C3 (de) 1980-07-10
DE2025828A1 (de) 1971-12-09

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Owner name: HAFTUNG, FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUKAU-WALTHER AKTIENGESELLSCHAFT;REEL/FRAME:004467/0600

Effective date: 19850918