US2973288A - Process and apparatus for continuous centrifuging of viscous sugar compounds - Google Patents

Process and apparatus for continuous centrifuging of viscous sugar compounds Download PDF

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Publication number
US2973288A
US2973288A US747401A US74740158A US2973288A US 2973288 A US2973288 A US 2973288A US 747401 A US747401 A US 747401A US 74740158 A US74740158 A US 74740158A US 2973288 A US2973288 A US 2973288A
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US
United States
Prior art keywords
bucket
sugar
molasses
upper edge
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US747401A
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English (en)
Inventor
Riedel Erich Oskar
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.)
Hein Lehmann and Co AG
Hein Lehmann AG
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Hein Lehmann AG
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
Priority claimed from DEH31747A external-priority patent/DE1081383B/de
Application filed by Hein Lehmann AG filed Critical Hein Lehmann AG
Application granted granted Critical
Publication of US2973288A publication Critical patent/US2973288A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/12—Inserts, e.g. armouring plates
    • B04B7/16—Sieves or filters
    • 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
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • 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
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/10—Control of the drive; Speed regulating

Definitions

  • This invention relates to a process for continuous centrifuging of viscous sugar compounds and to an apparatus therefor, in which the sugar compounds are inserted in the lower end of a centrifuge bucket which widens upward conically and rotates at high speed, whereby the molasses is centrifuged through the separator openings of the bucket and the solid sugar is carried over the upper rim of the bucket.
  • the continuous centrifuging operation does not merely require the application of the so-called thin-layer process, but that, moreover, a definite thickness (or fineness) of the layer must be maintained, especially at the upper end of the centrifuge bucket.
  • the layer traveling over the separating surface of the centrifuge bucket has a separating action of its own upon the mass to be centrifuged on account of that layers gaps in volume.
  • centrifuging is carried out under avoidance of loss and breakage of the sugar crystals. Otherwise, the yield of separated sugar is decreased considerably, and the process becomes uneconomical, even at increased throughput.
  • viscous sugar compounds can be refined by continuous centrifuging, and that simultaneously highest throughput, best possible separation and extensive avoidance of breaking of the sugar crystals can be attained when the materials to be centrifuged are conducted to the separating surface of the centrifuge bucket at constant acceleration, and when the quantities of the materials entered and the revolutions of the centrifuge bucket-are balanced, while considering the changing consistency of said materials, in such a manner that a continuous and comparatively slowly traveling fill of crystals prevails upon the separating surface which is completely covered.
  • This continuous fill due to its gaps in volume, exerts an additional separating action upon the materials which travel faster,
  • the thickness Patented Feb. 28, 1961 of the layer of materials at the upper end of the centrifuge bucket must be less than 4.5 mm.
  • this layer is thicker than 4.5 mm., it has been found in practive that the separation yield decreases, because the separating effect is insufficieut due to the short dwelling time of the materials to be centrifuged on the separating surface. On the other hand, constant coverage of the separating surface with crystals must be ensured because otherwise loss and breakage of the crystals occurs.
  • a sugar centrifuge which is equipped with a centrifuge bucket.
  • This centrifuge is characterized by the following combined features:
  • the centrifuge bucket is equipped with an adjustable drive, preferably an infinitely variable drive.
  • the centrifuge bucket has an accelerator pot which is not perforated and serves to accelerate the materials to be centrifuged to the rotational speed of the separating surface of the bucket.
  • the bucket has an even separating surface with elongated separating openings disposed in axial direction.
  • the upper cover of the housing supports a fishing ring which reaches downward to the upper rim of the bucket and is substantially of the same diameter as the latter.
  • a channel is installed which is equipped with deflector plates to prevent entry of molasses into the solid sugar collection chamber.
  • a centrifuge containing the above-mentioned features is distinguished particularly by the fact that a constant and continuous layer of material can be maintained on an even, conical separating surface, furthermore by constant acceleration of the entered material to the rotational speed of the separating surface, by eliminating the influence of rebounding sugar lumps on the operation of the centrifuge and on the separating surface, due ,to the action of the fishing ring, disposed near the upper rim of the bucket, and, finally, by preventing undesirable entry of molasses into the solid sugar collection chamber.
  • the construction of the separating openings according to the invention takes into consideration the' traveling motion and the outer crystal structure of the solid sugar particles by favoring, on the one hand, the separation while, on the other hand, not substantially exerting a detrimental abrasion on the solid sugar.
  • Bucket 2 is solidly supported by way of base 3 and an elastic bearing 4 on the bottom 5 of the housing.
  • the centrifuge bucket is driven by shaft 6 which leads centrally through base 3.
  • the centrifuge bucket 2 is provided with separating openings 11 and is surrounded by an inner chamber 12 which collects the molasses which are spun out through said openings, and also by anouter chamber 13 in which the solid sugar is collected which leaves the centrifuge bucket by Way of its upper rim 14.
  • the centrifuge bucket 2 is provided, at its lower end 2', with a non-perforated accelerator pct 15 into which the materials to be centrifuged are entered by way of supply pipe 16.
  • a fishing ring 17 is fastened which extends to the upper rim 14 of the centrifuge bucket 2 and whose diameter is just slightly smaller than that of the upper rim of the bucket. This fishing ring prevents sugar particles, spun out with high velocity, from rebounding into the centrifuge bucket. This is of importance because rebounding sugar chunks would interfere with the centrifuging operation and, furthermore, would damage the separating surface.
  • a channel 19 is provided for drawing off molasses which is equipped with annular deflector plates 20, 21 and which serves to prevent traveling of the spun-out molasses over the upper edge of the separating wall 18 into the solid sugar collection chamber 13.
  • a pipe 22 leads directly from channel 19 to the molasses drain 23 of the collection chamber 12.
  • the openings 11 in the centrifuge bucket are shaped as shown in Figs. 2 and 3. They are elongated in the direction of the bucket axis 24- and preferably are formed so that the projection of their effective limiting edges 11 on a plane surface leading through the bucket axis 24 is a circle or at least an oval whose long sides lie in the direction of the axis.
  • this formation of the outlet openings 11 leads to a good separation because it takes into account the traveling motion and the outer structure of the sugar crystals.
  • an abrasive action of the separating surface on the sugar crystals traveling thereover is largely inhibited.
  • the separating openings 11 must be kept the more elongated,'the more the generatrix of the bucket cone is inclined toward the vertical or toward axis 24, respectively.
  • the amount of charge of materials to be centrifuged, introduced through pipe 16, and the rotational speed of the centrifuge bucket 2 are balanced so that a continuous crystal fill totally covers the separating surface 2" which fill travels comparatively slowly.
  • This fill clue to its gaps in volume, exerts an additional separating action upon the materials to be centrifuged which travel at greater speed.
  • the mutual balancing of the charge and the rotational speed of the centrifuge bucket thereby must be executed in such a manner that not only a constantly continuous fill is 4 present on the separating surface, but also so that the layer thickness of the materials to be centrifuged on the upper rim 14 of bucket 2 remains smaller than 4.5 mm.
  • Apparatus for continuous centrifuging of viscous sugar comprising an outer housing, an inner housing spaced from said outer housing and provided with a bottom portion, both said housings forming a first chamber therebetween for centrifuged sugar, said outer housing provided with a top portion having a central circular opening, a base mounted on said inner housings bottom portion, a substantially frusto-conical centrifuge bucket mounted for vertical axial rotation on said base, said bucket having an upper edge portion aligned with said opening and wider than said buckets bottom portion and a separating Wall portion provided with a plurality of openings, variable speed means for rotating said bucket at high rotational speed, said base and said bucket forming a second chamber with said inner housing for collecting molasses spun through the openings in said bucket, an accelerator pot in the bottom portion of said bucket for receiving and accelerating the material to be centrifuged, a fishing ring secured in the opening in the top of said outer housing and extending downward toward the upper edge portion of said bucket for preventing sugar from rebounding into the bucket,
  • centrifuge bucket is provided in the area of its separating surface with longitudinal separating openings extending in an axial direction.
  • a process for continuous centrifuging of viscous sugar compounds comprising feeding centrifuging material to a centrifuge bucket at an evenly increasing speed, while adjusting the rotation of the bucket to the amount of material charged at a comparatively slow moving crystal flow rate, covering the separating surface and exerting an additional separating effect on the centrifuging material, while keeping the layer thickness of the centrifuging material at the top of the centrifuging bucket smaller than 4.5 mm.

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  • Centrifugal Separators (AREA)
US747401A 1957-11-26 1958-07-09 Process and apparatus for continuous centrifuging of viscous sugar compounds Expired - Lifetime US2973288A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH31747A DE1081383B (de) 1957-11-26 1957-11-26 Zentrifuge zum kontinuierlichen Trennen von Feststoff-Fluessigkeits-Gemischen, insbesondere Zuckerzentrifuge
DE2973288X 1958-01-04

Publications (1)

Publication Number Publication Date
US2973288A true US2973288A (en) 1961-02-28

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ID=32394827

Family Applications (1)

Application Number Title Priority Date Filing Date
US747401A Expired - Lifetime US2973288A (en) 1957-11-26 1958-07-09 Process and apparatus for continuous centrifuging of viscous sugar compounds

Country Status (5)

Country Link
US (1) US2973288A (OSRAM)
DE (1) DE1072560B (OSRAM)
FR (2) FR1203644A (OSRAM)
GB (1) GB838049A (OSRAM)
NL (1) NL280962A (OSRAM)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205095A (en) * 1962-10-02 1965-09-07 Braunschweigische Maschb Ansta Sugar recovery centrifuge
US3207627A (en) * 1961-11-24 1965-09-21 Braunschweigische Maschb Ansta Centrifuge for the continuous recovery of sugar crystals
US3226257A (en) * 1961-10-09 1965-12-28 American Factors Ass Ltd Continuous centrifugal apparatus
US3238063A (en) * 1962-08-03 1966-03-01 American Factors Ass Ltd Continuous centrifugal apparatus and method of continuously separating granular crystals therewith
US3275153A (en) * 1963-10-17 1966-09-27 Hein Lehmann & Co A G Sieve-centrifuge
US3283910A (en) * 1964-04-02 1966-11-08 Western States Machine Co Centrifugal basket
US3311240A (en) * 1963-04-11 1967-03-28 Hein Lehmann Ag Centrifuge
US3496016A (en) * 1965-09-08 1970-02-17 Hein Lehmann Ag Centrifuge
US3497386A (en) * 1965-09-29 1970-02-24 American Factors Ass Ltd Automatic control system for load-carrying rotors
US3837913A (en) * 1972-02-18 1974-09-24 Braunschweigische Masch Bau Continuously operating centrifuge
US3926661A (en) * 1974-02-01 1975-12-16 Werner Steprath Centrifuge construction
US3970470A (en) * 1974-10-18 1976-07-20 Hein, Lehmann A.G. Centrifuge
US4063959A (en) * 1976-03-04 1977-12-20 Braunschweigische Maschinenbauanstalt Continuously operating sugar centrifuge
US4097303A (en) * 1976-01-23 1978-06-27 Braunschweigische Maschinenbauanstalt Batch-type centrifuge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208253B (de) * 1961-07-26 1965-12-30 Braunschweigische Maschb Ansta Kontinuierlich arbeitende Zuckerzentrifuge
DE1163250B (de) * 1961-10-12 1964-02-13 Braunschweigische Maschb Ansta Verfahren zum Regeln der Verweilzeit des Schleudergutes in einer kontinuierlich arbeitenden Zentrifuge mit konischer Siebtrommel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US242110A (en) * 1881-05-31 garstaedt
US1753023A (en) * 1928-04-06 1930-04-01 Western States Machine Co Centrifugal basket

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US242110A (en) * 1881-05-31 garstaedt
US1753023A (en) * 1928-04-06 1930-04-01 Western States Machine Co Centrifugal basket

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226257A (en) * 1961-10-09 1965-12-28 American Factors Ass Ltd Continuous centrifugal apparatus
US3207627A (en) * 1961-11-24 1965-09-21 Braunschweigische Maschb Ansta Centrifuge for the continuous recovery of sugar crystals
US3238063A (en) * 1962-08-03 1966-03-01 American Factors Ass Ltd Continuous centrifugal apparatus and method of continuously separating granular crystals therewith
US3205095A (en) * 1962-10-02 1965-09-07 Braunschweigische Maschb Ansta Sugar recovery centrifuge
US3311240A (en) * 1963-04-11 1967-03-28 Hein Lehmann Ag Centrifuge
US3275153A (en) * 1963-10-17 1966-09-27 Hein Lehmann & Co A G Sieve-centrifuge
US3283910A (en) * 1964-04-02 1966-11-08 Western States Machine Co Centrifugal basket
US3496016A (en) * 1965-09-08 1970-02-17 Hein Lehmann Ag Centrifuge
US3497386A (en) * 1965-09-29 1970-02-24 American Factors Ass Ltd Automatic control system for load-carrying rotors
US3837913A (en) * 1972-02-18 1974-09-24 Braunschweigische Masch Bau Continuously operating centrifuge
US3926661A (en) * 1974-02-01 1975-12-16 Werner Steprath Centrifuge construction
US3970470A (en) * 1974-10-18 1976-07-20 Hein, Lehmann A.G. Centrifuge
US4097303A (en) * 1976-01-23 1978-06-27 Braunschweigische Maschinenbauanstalt Batch-type centrifuge
US4063959A (en) * 1976-03-04 1977-12-20 Braunschweigische Maschinenbauanstalt Continuously operating sugar centrifuge

Also Published As

Publication number Publication date
GB838049A (en) 1960-06-22
DE1072560B (de) 1959-12-31
FR1215701A (fr) 1960-04-20
NL280962A (OSRAM) 1964-05-11
FR1203644A (fr) 1960-01-20

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