US3837913A - Continuously operating centrifuge - Google Patents

Continuously operating centrifuge Download PDF

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Publication number
US3837913A
US3837913A US00265575A US26557572A US3837913A US 3837913 A US3837913 A US 3837913A US 00265575 A US00265575 A US 00265575A US 26557572 A US26557572 A US 26557572A US 3837913 A US3837913 A US 3837913A
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United States
Prior art keywords
massecuite
inlet tube
tube
steam
cup
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Expired - Lifetime
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US00265575A
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English (en)
Inventor
H Hillebrand
H Schaper
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.)
BMA Braunschweigische Maschinenbauanstalt AG
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BMA Braunschweigische Maschinenbauanstalt AG
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    • 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
    • B04B11/06—Arrangement of distributors or collectors in 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

Definitions

  • This invention relates to a continuously operating sugar centrifuge of the type having a conical screening basket which rotates around a perpendicular axis.
  • a massecuite feeding device comprising an inlet pipe is mounted coaxially to the rotation axis of the screening basket and a distribution cone is mounted at the hub of the screening basket and an acceleration cone.
  • the massecuite feeding arrangement of continuously operating centrifuges in the past have not been entirely satisfactory. It has been customary to feed the massecuite coming out of a slide valve to dose the massecuite feed in a free falling stream manner through an inlet pipe. This process frequently involves a break away of the massecuite stream. In such arrangements it is also possible for the massecuite stream to contact the inlet pipe. If this occurs, the massecuite adheres to the inlet pipe and runs off more slowly than in a free stream. As a consequence, the inlet pipe is filled rapidly with massecuite and overflows.
  • the rotating screening basket of a continuously operating centrifuge acts like a ventilator.
  • the freely running massecuite stream in the inlet pipe is surrounded by an intense air flow which is sucked in from the outer atmosphere so that the massecuite is cooled and its viscosity increased.
  • a satisfactory run of a continuously operating centrifuge depends upon the equal distribution of the massecuite on the screening basket. As the viscosity increases, however, it becomes more difficult to attain the desired equal distribution. As the temperature of the massecuite reaching the screening basket decreases, the separating efficiency also decreases, since, due to the increase in the viscosity of the molasses, the curing power does not suffice to cure the thin layer of molasses adhering to the sugar crystals.
  • Final product massecuites usually have a very high viscosity. In some countries, the viscosity of final product massecuites is extremely high due to specific characteristics of the processed sugar cane that vary from country to country. In processing this type of final product massecuite, it is impossible to achieve an even massecuite feed and an even massecuite distribution by means of the known massecuite feeding devices. It often happens in the processing of this type of massecuite that the massecuite stream is interrupted. Single massecuite lumps may thus occur in the distribution cup, and upon being ejected from the distribution cup, the lumps reach the screening basket from the acceleration cone without any fundamental acceleration. These massecuite lumps often produce dangerous imbalances and hence often necessitate turning off of the centrifuge.
  • wash water from the outside has been sprayed on the flowing massecuite stream.
  • the wash water only wets the surface of the massecuite stream without amalgamating with the massecuite and without reducing its viscosity.
  • the wash water had the effect of a lubricant in the distribution cup and in the acceleration cone. Even distribution did not occur because the massecuite was not driven from the wall of the distribution cup and the wall of the acceleration cone.
  • a vertical tube was positioned centrally in the massecuite stream, and the top of the tube was connected to a steam or wash water feed line. It was noted that this tube served to center the massecuite jet. The massecuite stream was not interrupted or deflected laterally to contact the wall of the inlet pipe as often in this arrangement. The centering of the massecuite jet, however, was the only improvement which was achieved with the use of such a tube since the desired comingling of wash water or steam with the massecuite did not occur. The unwanted lubricating effect also occurred in this arrangement. In addition, the central tube acted as heating element. The massecuite was thus heated by the tube. Certain portions of the sugar which had previously been crystallized out by earlier cooling steps were dissolved again. Considerable sugar losses thus resulted as the dissolved sugar entered the final molasses during the curing process.
  • a continuously operating sugar centrifuge of the first above disclosed type and having a vertical inlet tube which projects into the inside of a distribution cup.
  • the distribution cup is equipped with several perpendicular distributing pins spaced between inlet tube and the lateral wall of the distribution cup. The top ends of the pins are located between the bottom edge of the inlet tube and the top edge of the distribution cup.
  • the inlet tube has a funnel-shaped upper end.
  • An annular tube adapted to be connected to a wash water feed line is provided at the upper end of the inlet tube.
  • the annular tube is perforated at the inside of the ring in order to direct wash water jets radially toward the center of the inlet tube and onto the massecuite jet.
  • the lower end of the inlet tube is perforated at least in the upper part of its length, and equipped with a double shell to form an annular cavity connected to a steam feed line.
  • the quantity of heat and the duration of heating of the massecuite resulting from the added vapor are limited so that the desired reduction of viscosity will be achieved, while the dissolution of sugar crystals will be avoided.
  • the wash water, which is added to the massecuite when reducing the viscosity and which is well integrated into the massecuite has enough time on its way to the screening basket from the distribution cup to act upon the molasses and to increase its ability to flow. Tests have proved that sugar of high quality may be produced with the sugar centrifuge in accordance with the invention without the necessity of after-curing.
  • a vapor shell is formed in the upper part of the inlet tube between the outer double shell and the inlet tube, and steam from the vapor shell enters the space between the massecuite jet and the inlet tube.
  • the vapor circulates around the massecuite jet from the outside and due to the ventilation effect of the screening basket the massecuite jet will be sucked downwards to the distributing cup where it will be mixed with the massecuite by the distributing pins.
  • the vapor emitted in the upper part of the inlet tube prevents the cold outer air from being sucked in. It thus avoids the previously unavoidable cooling of the free-running massecuite jet in the inlet tube.
  • the centrifuge according to the invention In order to avoid cooling of the massecuite, it is advantageous to design the centrifuge according to the invention so that the inside of the acceleration cone at the pass of the inlet tube is almost completely sealed against air entering from outside. In order to achieve the desired effect it is sufficient if an annular disk is assembled on the outside of the inlet tube and slightly axially spaced from the acceleration cone bottom through which the tube extends so that a gap of only a few millimeters remains between this disk and the acceleration cone. A relatively great radial clearance may then be left between the acceleration cone and the inlet tube. The air stream entering the inside of the acceleration cone through the small annular gap will be considerably impeded and will additionally be heated by the inlet tube.
  • centrifuge according to the invention are especially obvious when processing highly viscuous final product massecuites, as this type of massecuite for the first time may be cured with satisfactory capacity and satisfactory separating effect ac cording to the invention.
  • considerable operational improvements occur when processing different types of massecuite. Depending upon the quality of the massecuite it is possible to eliminate the use of wash water spraying or vapor ventilation.
  • the bottom edge of the inlet tube may be vertically adjustable to vary the distance therefrom to the bottom of the distribution cup in an improved design of the sugar centrifuge according to the invention. This adjustment is important in order to compensate for the qualities of various types of massecuite.
  • sugar massecuite in a free running massecuite stream 2 falls under the influence of gravity from a slide valve 1.
  • the funnel-shaped upper part 3 of the inlet tube 4 is located in a space below the slide valve, the tube 4 having a vertical axis.
  • An annular tube 5 is connected to the wash water feeding line 6, the inner side of the ring being perforated and constituting the upper termination of the funnalshaped part 3.
  • Wash water jets 8 ejected funnel-shaped the holes 7 are directed radially inwardly toward the center of the inlet tube 4, and reach the outer surface of the massecuite jet 2.
  • the inlet tube 4 is equipped with holes 9 and an outer double shell 10.
  • the annular cavity 11 between the outer double shell and the inlet tube 4 is connected to a steam feeding line 12a and constitutes a vapor shell.
  • Vapor jets are directed from the cavity through the screen holes 9 to circulate around the massecuite jet 2 from the outside, the vapor jets thus constituting a vapor shell around the massecuite jet.
  • the inlet tube 4 projects deeply into the distribution cup 12 located below the tube.
  • This distribution cup 12 is equipped with several perpendicular distributing pins 13 projecting upwardly from the bottom of the cup.
  • these distributing pins 13 are positioned between the lateral wall of the distribution cup 12 and the outer side of the inlet tube 4, and it is furthermore necessary that the bottom edge 14 of the inlet tube 4 extends to a position spaced from the bottom 15 of the distribution cup 12 and particularly below the top ends of the distributing pins 13. Only if the bottom edge 14 is located far enough below the upper ends of the distributing pins 13 and close enough to the bottom 15 of the distribution cup 12, will it be ensured that the massecuite entering the inside of the distribution cup 12 will be seized by the distributing pins 13, and will be processed to a homogeneous mixture with the wash water and with the steam entering at the same time so that it will be distributed evenly on the lateral wall of the distribution cup.
  • the bottom edge 14 of the inlet tube 4 is vertically adjustable, for example by means of spacer rings 10.
  • Inlet tube 4 may alternately be slideable in the collar 32.
  • the desired position of the bottom edge 14 is then fixed by means of a set screw 10".
  • the massecuite runs with an even distribution out of the distribution cup 12 and into the acceleration cone 16 externally surrounding the distribution cup.
  • the cone 16 is connected to the cup 12; via straps 17.
  • the diameter of the cone 16 gradually increases from the top thereof to which the straps 17 are connected toward its bottom edge 18.
  • the cone 16 is in the form of a frustum of a cone with the lower base open and the inlet tube extending through the upper base.
  • the massecuite leaves the bottom edge of the cone in an accelerated manner, evenly distributed on the circumference thereof and its thence discharged into the feeding area 19 of a conical screening basket 20.
  • the massecuite is cured when it passes through the screening basket 20. Molasses is discharged through the screening areas of the screening basket, whereas sugar is released by way of the top edge of the basket.
  • a disk 30 is affixed to the outside of the tube 4 just below the point where the tube passes through the bottom 31 of the inverted core 16. The perimeter of this disk is slightly axially separated from the bottom 31 to provide a seal against circulating air. Besides. the disk 30 closes the steam cavity 11.
  • a massecuite feeding arrangement for a continuously operating sugar centrifuge having a conical screening basket rotatable around a vertical axis and having a massecuite feeding device positioned to feed massecuite coaxially to the center of rotation of the screening basket, said feeding arrangement comprising a vertical inlet tube having a lower free end, a rotatable distribution cup positioned beneath said tube, whereby said lower free end of said inlet tube reaches into said cup to form a gap between the inner wall of the cup and the outer surface of said inlet tube, a plurality of vertical distributing pins mounted in said cup to reach into said gap, the lower free end of said tube terminating a distance spaced from the bottom of said cup and below the tops of said pins, means for introducing massecuite to the top of said inlet tube, rotatable acceleration cone means located in said screening basket and surrounding said cup to receive massecuite from said cup and to direct the massecuite toward said screening basket, means for introducing steam into said vertical inlet tube, as well
  • said means for introducing steam into said vertical inlet tube comprises a double shell surrounding said vertical inlet tube to form a cavity for receiving steam from a source of steam, and apertures in the walls of said vertical inlet tube for directing steam from said cavity radially inwardly relative to said vertical inlet tube and onto said massecuite.
  • said means for exposing the massecuite to washing water comprises an annular tube positioned at the top of said vertical inlet tube and having inwardly facing apertures, whereby water introduced into said annular tube is directed radially inwardly into said inlet tube and onto the massecuite.

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  • Centrifugal Separators (AREA)
US00265575A 1972-02-18 1972-06-23 Continuously operating centrifuge Expired - Lifetime US3837913A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2207663A DE2207663C3 (de) 1972-02-18 1972-02-18 Kontinuierlich arbeitende Zuckerzentrifuge

Publications (1)

Publication Number Publication Date
US3837913A true US3837913A (en) 1974-09-24

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US00265575A Expired - Lifetime US3837913A (en) 1972-02-18 1972-06-23 Continuously operating centrifuge

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US (1) US3837913A (enrdf_load_stackoverflow)
JP (1) JPS5019790B2 (enrdf_load_stackoverflow)
AU (1) AU448889B2 (enrdf_load_stackoverflow)
BE (1) BE797204A (enrdf_load_stackoverflow)
BR (1) BR7204891D0 (enrdf_load_stackoverflow)
DE (1) DE2207663C3 (enrdf_load_stackoverflow)
FR (1) FR2175554B1 (enrdf_load_stackoverflow)
GB (1) GB1363025A (enrdf_load_stackoverflow)
IT (1) IT962359B (enrdf_load_stackoverflow)
ZA (1) ZA724255B (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970470A (en) * 1974-10-18 1976-07-20 Hein, Lehmann A.G. Centrifuge
US3970244A (en) * 1973-06-19 1976-07-20 Escher Wyss Limited Clearing centrifuge
US3989185A (en) * 1974-06-17 1976-11-02 Fives-Cail Babcock Centrifugal machine
US4017022A (en) * 1974-10-24 1977-04-12 Maschinenfabrik Buckau R. Wolf Aktiengesellschaft Centrifuge arrangement and method of making a conical container therefor
US4052304A (en) * 1976-07-21 1977-10-04 Cf&I Engineers, Inc. Preheating device for centrifugal
US4063959A (en) * 1976-03-04 1977-12-20 Braunschweigische Maschinenbauanstalt Continuously operating sugar centrifuge
US4331482A (en) * 1979-09-11 1982-05-25 Braunschweigische Maschinenbauanstalt Continuously operating centrifuge
AU640835B2 (en) * 1990-11-30 1993-09-02 Braunschweigische Maschinenbauanstalt A.G. Centrifuge
US5256289A (en) * 1991-11-04 1993-10-26 Centrifugal & Mechanical Industries, Inc. Centrifugal separator incorporating structure to reduce abrasive wear
US5410795A (en) * 1993-10-12 1995-05-02 Centrifugal & Mechanical Industries, Inc. Method of assembly and apparatus for a screen in a centrifugal separator
US5558770A (en) * 1995-07-03 1996-09-24 Elgin National Industries, Inc. Centrifugal separator having a cone frustum
US20050054506A1 (en) * 2003-07-30 2005-03-10 Bradley Bruce J. Microbial concentration system
CN102438756A (zh) * 2009-05-15 2012-05-02 Bma布伦瑞克机器制造有限公司 持续运转的离心机
US8647505B2 (en) 2011-06-24 2014-02-11 The Western States Machine Company Screen clamp with integrated center feed
US8721793B2 (en) 2011-04-04 2014-05-13 The Western States Machine Company Continuous centrifuge feed pipe mixing system
CN109261380A (zh) * 2018-09-18 2019-01-25 郑州智锦电子科技有限公司 一种选矿机用搅拌机构
WO2020194169A1 (en) 2019-03-22 2020-10-01 Flsmidth A/S Centrifugal separator and screen having blades for same

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DE2749282C2 (de) * 1977-11-03 1985-10-10 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter Kontinuierlich arbeitende Zentrifuge mit Bedampfungsvorrichtung
DE2847465A1 (de) * 1978-11-02 1980-05-14 Braunschweigische Masch Bau Fuellmasseeinspeisevorrichtung
DE3244002C2 (de) * 1982-11-27 1984-11-29 Hein, Lehmann AG, 4000 Düsseldorf Füllmasse-Einspeisevorrichtung für eine Zuckerzentrifuge
DE4425063C2 (de) * 1994-07-15 1999-05-06 Braunschweigische Masch Bau Kontinuierlich arbeitende Zentrifuge zum Abschleudern von Zuckerfüllmassen

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US2973288A (en) * 1957-11-26 1961-02-28 Hein Lehmann Ag Process and apparatus for continuous centrifuging of viscous sugar compounds
US3226257A (en) * 1961-10-09 1965-12-28 American Factors Ass Ltd Continuous centrifugal apparatus
US3301708A (en) * 1964-05-05 1967-01-31 Buckau Wolf Maschf R Apparatus for separating crystals from sugar syrup
US3497385A (en) * 1961-10-09 1970-02-24 Cf & I Engineers Control of solution input to continuous centrifugal

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DE50333C (de) * J. VON SZCZENIOWSKI und G. VON PlONTKOWSKI in Zuckerfabrik Kapusciany, Podolien Ununterbrochen wirkende Schleudermaschine
US1569778A (en) * 1921-09-07 1926-01-12 Edward S Murphy Continuous automatic separator
US2335794A (en) * 1938-10-26 1943-11-30 Federico G Sanchez Continuous action centrifugal separator
GB709449A (en) * 1950-10-28 1954-05-26 Federico Guillermo Sanchez Continuous action centrifugal separator
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DE1181135B (de) * 1961-11-24 1964-11-05 Braunschweigische Maschb Ansta Verfahren zum Betrieb einer kontinuierlich arbeitenden Zuckerzentrifuge und Zucker-zentrifuge zur Durchfuehrung des Verfahrens
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DE1194782B (de) * 1963-02-12 1965-06-10 Buckau Wolf Maschf R Beschleunigungsvorrichtung fuer eine Zentrifuge
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DE1432874A1 (de) * 1964-01-11 1969-01-30 Siteg Siebtech Gmbh Verfahren und Vorrichtung zur thermischen Unterstuetzung der Schleuderentwaesserung fuer Kohlen
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US3390777A (en) * 1964-11-19 1968-07-02 Western States Machine Co Feed-straining continuous centrifugal basket with trash trapping means
FR1444790A (fr) * 1965-05-18 1966-07-08 Fives Lille Cail Dispositif d'alimentation pour essoreuse centrifuge à marche continue
GB1074229A (en) * 1965-09-15 1967-07-05 Hein Lehmann & Co A G Improved centrifuge
US3393805A (en) * 1966-06-13 1968-07-23 Western States Machine Co Massecuite director for continuous centrifugal
DE1632287A1 (de) * 1967-07-08 1970-10-29 Hoechst Ag Eintragvorrichtung fuer Schleudern
DE1632301A1 (de) * 1967-09-16 1970-08-27 Krauss Maffei Ag Zentrifuge fuer Suspensionen
US3531872A (en) * 1968-09-13 1970-10-06 Envirotech Corp Process and apparatus for deliquifying fluent material
FR1595971A (enrdf_load_stackoverflow) * 1968-12-09 1970-06-15
DE2018677A1 (en) * 1970-04-18 1971-10-28 Krauss-Maffei AG, 8000 München Plate shape sieve wet sieving machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973288A (en) * 1957-11-26 1961-02-28 Hein Lehmann Ag Process and apparatus for continuous centrifuging of viscous sugar compounds
US3226257A (en) * 1961-10-09 1965-12-28 American Factors Ass Ltd Continuous centrifugal apparatus
US3497385A (en) * 1961-10-09 1970-02-24 Cf & I Engineers Control of solution input to continuous centrifugal
US3301708A (en) * 1964-05-05 1967-01-31 Buckau Wolf Maschf R Apparatus for separating crystals from sugar syrup

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970244A (en) * 1973-06-19 1976-07-20 Escher Wyss Limited Clearing centrifuge
US3989185A (en) * 1974-06-17 1976-11-02 Fives-Cail Babcock Centrifugal machine
US3970470A (en) * 1974-10-18 1976-07-20 Hein, Lehmann A.G. Centrifuge
US4017022A (en) * 1974-10-24 1977-04-12 Maschinenfabrik Buckau R. Wolf Aktiengesellschaft Centrifuge arrangement and method of making a conical container therefor
US4063959A (en) * 1976-03-04 1977-12-20 Braunschweigische Maschinenbauanstalt Continuously operating sugar centrifuge
US4052304A (en) * 1976-07-21 1977-10-04 Cf&I Engineers, Inc. Preheating device for centrifugal
US4331482A (en) * 1979-09-11 1982-05-25 Braunschweigische Maschinenbauanstalt Continuously operating centrifuge
AU640835B2 (en) * 1990-11-30 1993-09-02 Braunschweigische Maschinenbauanstalt A.G. Centrifuge
US5244502A (en) * 1990-11-30 1993-09-14 Braunschweigische Maschinenbauanstalt Ag Continuously operating centrifuge
US5256289A (en) * 1991-11-04 1993-10-26 Centrifugal & Mechanical Industries, Inc. Centrifugal separator incorporating structure to reduce abrasive wear
US5410795A (en) * 1993-10-12 1995-05-02 Centrifugal & Mechanical Industries, Inc. Method of assembly and apparatus for a screen in a centrifugal separator
US5558770A (en) * 1995-07-03 1996-09-24 Elgin National Industries, Inc. Centrifugal separator having a cone frustum
US20050054506A1 (en) * 2003-07-30 2005-03-10 Bradley Bruce J. Microbial concentration system
CN102438756A (zh) * 2009-05-15 2012-05-02 Bma布伦瑞克机器制造有限公司 持续运转的离心机
US20120142513A1 (en) * 2009-05-15 2012-06-07 Bma Braunschweigische Maschinenbauanstalt Ag Continuously operating centrifuge
CN102438756B (zh) * 2009-05-15 2013-08-14 Bma布伦瑞克机器制造有限公司 持续运转的离心机
US9180467B2 (en) * 2009-05-15 2015-11-10 Bma Braunschweigische Maschinenbauanstalt Ag Continuously operating centrifuge
US8721793B2 (en) 2011-04-04 2014-05-13 The Western States Machine Company Continuous centrifuge feed pipe mixing system
US8647505B2 (en) 2011-06-24 2014-02-11 The Western States Machine Company Screen clamp with integrated center feed
CN109261380A (zh) * 2018-09-18 2019-01-25 郑州智锦电子科技有限公司 一种选矿机用搅拌机构
CN109261380B (zh) * 2018-09-18 2020-09-04 温州曼昔维服饰有限公司 一种选矿机用搅拌机构
WO2020194169A1 (en) 2019-03-22 2020-10-01 Flsmidth A/S Centrifugal separator and screen having blades for same

Also Published As

Publication number Publication date
BR7204891D0 (pt) 1973-09-20
JPS4890055A (enrdf_load_stackoverflow) 1973-11-24
IT962359B (it) 1973-12-20
GB1363025A (en) 1974-08-14
ZA724255B (en) 1973-04-25
FR2175554B1 (enrdf_load_stackoverflow) 1977-04-01
AU448889B2 (en) 1974-05-30
DE2207663C3 (de) 1984-04-26
JPS5019790B2 (enrdf_load_stackoverflow) 1975-07-09
DE2207663A1 (de) 1973-08-30
AU4384672A (en) 1974-01-03
DE2207663B2 (de) 1975-06-19
BE797204A (fr) 1973-07-16
FR2175554A1 (enrdf_load_stackoverflow) 1973-10-26

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