EP0692311A1 - Centrifugeuse travaillant en continu pour la centrifugation de masses cuites - Google Patents

Centrifugeuse travaillant en continu pour la centrifugation de masses cuites Download PDF

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Publication number
EP0692311A1
EP0692311A1 EP95110469A EP95110469A EP0692311A1 EP 0692311 A1 EP0692311 A1 EP 0692311A1 EP 95110469 A EP95110469 A EP 95110469A EP 95110469 A EP95110469 A EP 95110469A EP 0692311 A1 EP0692311 A1 EP 0692311A1
Authority
EP
European Patent Office
Prior art keywords
centrifuge according
centrifuge
treatment device
further treatment
basket
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.)
Granted
Application number
EP95110469A
Other languages
German (de)
English (en)
Other versions
EP0692311B1 (fr
Inventor
Ralf-Martin Ebeling
Helmut 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
Original Assignee
BMA Braunschweigische Maschinenbauanstalt 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.)
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Publication date
Application filed by BMA Braunschweigische Maschinenbauanstalt AG filed Critical BMA Braunschweigische Maschinenbauanstalt AG
Publication of EP0692311A1 publication Critical patent/EP0692311A1/fr
Application granted granted Critical
Publication of EP0692311B1 publication Critical patent/EP0692311B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B30/00—Crystallisation; Crystallising apparatus; Separating crystals from mother liquors ; Evaporating or boiling sugar juice
    • C13B30/04—Separating crystals from mother liquor
    • C13B30/06—Separating crystals from mother liquor by centrifugal force
    • 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

  • the invention relates to a continuously operating centrifuge for the decanting of sugar filling masses, with a conically widening sieve basket which rotates about a vertical axis and has a throwing edge from which the sugar particles are thrown outwards and collected there in a further treatment device and further processed.
  • centrifuges are known for example from DE 22 07 663 C3, DE 25 50 496 A1, DE 90 04 952 U1 or EP 0 487 780 B1.
  • the sugar filling mass is first introduced into the central area of the centrifuge and then guided into the narrower inner area of the sieve basket by means of a distribution pot or in another way, accelerated to a peripheral speed in the distributor or in an acceleration bell or pre-spinning drum and then thrown outwards.
  • the particles then meet in the narrower, inner, usually lower area of the conically widening strainer basket and "migrate" slowly up this inner wall to the discharge edge. If they have reached this, they are thrown outwards.
  • the centrifuges produce either dry sugar, dissolved sugar or mashed sugar, and are operated either as dissolving, mashing or dry centrifuges.
  • the separated and purified sugar crystals are redissolved in various ways.
  • a mashing process is additionally activated, in which the crystals are retained, but the surrounding syrup cover is dissolved and ultimately replaced by a cleaner syrup cover.
  • the dry sugar crystals are discharged downwards and removed via a transport device.
  • the three operating modes each require different centrifuges and it is not absolutely possible to use a centrifuge designed for one of these purposes for the other. This means limited flexibility for the user and disadvantages for the centrifuge manufacturer when it comes to stockpiling.
  • the object of the invention is to propose a continuously operating centrifuge for the centrifuging of sugar filling masses, which is suitable for several applications.
  • the further treatment device has a preferably removable receptacle with at least one outlet nozzle on the bottom and that an overflow nozzle can be fitted in the region of the outlet nozzle.
  • the use of the centrifuge according to the invention is possible both as a mashing-in and as a dissolving centrifuge; use as a dry centrifuge also belongs to the area of application.
  • the drainage channel is blocked by attaching the overflow nozzle.
  • the dissolving medium that is water and / or thin juice, and the sugar crystals already formed are collected and dissolved in the collecting channel.
  • a clarification sump is formed in the collecting channel through the overflow connection. This creates a time to redeem. Undissolved crystals sink to the bottom of the collecting channel.
  • a steam line is routed and steam is fed into the collecting channel in the bottom region, that is to say when used as a dissolving centrifuge within the clarification sump.
  • This steam line (s) can be removable so as not to become encrusted in other forms of use.
  • the liquid level which has risen above the overflow connection then flows off via the overflow connection into the outlet connection and can be collected there.
  • the overflow nozzle is preferably infinitely adjustable or overflow nozzles of different heights can be used.
  • the dissolving centrifuge known from DE 25 50 496 A1, for example, also collects the initially spun off sugar crystals, but not in a collecting channel. It would not be usable as a mash centrifuge, since the viscous magma would immediately clog everything.
  • the centrifuge according to the invention is to work as a mash centrifuge, the overflow nozzle is removed. In contrast to a clarification, the affection magma that flows away very slowly is then derived directly, without the risk of constipation.
  • the mashing medium is preferably applied via an outer ring line to an impact surface which forms the wall of the collecting channel facing away from the strainer basket or projects therefrom. A layer of the mash medium spreads out on the impact surface, into which the centrifuged sugar crystals are immersed.
  • the further processing device preferably surrounds the sieve basket in a ring. This ensures uniform further treatment of the sugar crystals in all applications.
  • a feed device in particular a ring line, feeds the dissolving medium in the region of the discharge edge of the screen basket.
  • This ring line runs at a relatively short distance above the ejection edge and sprays or otherwise feeds the dissolving medium to the sugar crystals thrown off in this area.
  • the rotating medium of the sieve basket swirls the solvent and, together with the sugar crystals, throws it tangentially away from the sieve basket and over the collecting channel against a baffle behind it.
  • the turbulence already promotes the release effect and the even distribution of sugar crystals and dissolving medium during this flight phase.
  • the collecting channel is already filled with a dissolving medium and sugar crystals dissolved in it.
  • the sugar crystals continue to dissolve during the static residence time and the clarifier then flows over the overflow nozzle into the outlet nozzle.
  • the collecting channel in a ring shape as a continuous channel around the strainer basket.
  • the further treatment device has a plurality of collecting channels, each of which has at least one outlet connection on the bottom, overflow connections being attachable in the region of the outlet connection. This enables more targeted access and quantitatively more precise recordings of the respective products.
  • inclined surfaces are arranged between each two collecting channels, which ensure that particles lying on them slide in the adjacent receiving bearing.
  • vagabonding particles form above the further treatment device. It should also be borne in mind that the spun off sugar crystals with the adhering syrup residues are spun off not radially but tangentially and also have corresponding movement components.
  • the further processing device surrounding the sieve basket in a ring at a constant distance from the sieve basket axis has a sawtooth-like profile, at the lowest points of which the outlet connections are arranged.
  • the collecting channels are located next to each other in a basin-like manner from the inside of the strainer basket, each at the same distance from the strainer basket axis, and are separated from one another by inclined surfaces or are connected to one another via these.
  • the collecting channels and the inclined surfaces between them are closed off by a baffle.
  • the centrifuge shown has a fixed frame 10 with a base 11, side walls 12, a cover 13 above the actual strainer basket 20 and a filling funnel 14.
  • the sugar filling mass falls into the distribution pot 30 through the filling funnel 14 and a likewise fixed shaft 15.
  • the screen basket 20, the distributor pot 30 and a product distributor 40 rotate about a common vertical axis 16.
  • the sugar filling masses given in the filling funnel 14 are conveyed through the distribution pot 30 and the product distributor 40 and thereby accelerated to the peripheral speed of the product distributor.
  • the sieve basket 20 is closed at the top by a discharge edge 22 which rotates together with the sieve basket at a known speed. From the discharge edge 22, the sugar particles are thrown outwards and collected in a further treatment device 60 and processed further.
  • a ring line 66 is located above the discharge edge 22. This ring line sprays solvent medium into the area just below it, from which the sugar crystals are thrown outwards.
  • the ring line is stationary and does not rotate with the discharge edge 22; the rotating medium and the moving sugar crystals, however, strongly swirl the dissolving medium and mix it with the sugar crystals. Together with them, the dissolving medium is thrown outwards, namely through the further treatment device 60 over a collecting channel 61 against a preferably removable baffle surface 64, which rises upward from the collecting channel 61 as a sieve basket-like wall. Dissolving medium, in particular water and / or thin juice, together with sugar crystals that have already been partially dissolved, then slide into the collecting channel 61 from the impact surface 64.
  • Dissolving medium with sugar crystals has already collected in this.
  • the collecting channel 61 has an outlet connection 62, but in the example shown (see FIG. 3) this is blocked by an overflow connection 63. So liquid accumulates as a clarification sump until it reaches the edge of the overflow nozzle 63 and can then run down this edge into the overflow nozzle and from there down into the drain nozzle 62.
  • This further treatment device 60 surrounds the screen basket 20 in an annular manner (see FIG. 2). It can be seen that a plurality of basin-like collecting channels 61 are provided, which together form the annular further treatment device 60.
  • Each of the collecting channels 61 is approximately the same size and has the same distance from the screen basket axis. At its deepest point there is the outlet connection 62.
  • On one side a boundary wall 67 protrudes from the collecting channel, on the other side there is a clearly less steep, but sufficiently inclined surface which rises towards the neighboring collecting channel 61 and there is connected to the steep flank 67 rising from it.
  • the sloping surfaces allow particles coming on them to slide into the collecting channels, but at the same time they increase the average length of time for particles in this area.
  • a steam line 68 runs in the bottom area of the collecting channel 61. From it, steam can be led into the clarification sump in order to further improve the solution.
  • the steam line 68 can be dismantled in order to prevent clogging and crusting when the centrifuge is used as a mashing centrifuge.
  • This representation describes the use of the centrifuge according to the invention as a dissolving centrifuge.
  • the overflow nozzle (s) 63 are removed. In addition, the supply of dissolution medium through the ring line 65 is stopped.
  • mash medium is fed through a second ring line 66.
  • This second, outer ring line concentrically surrounds the strainer basket 20 and the other ring line 65; it runs approximately above the baffle 64 and releases mash medium.
  • the mashing medium also prevents the sugar crystals from bursting, which would be very undesirable in this mode of operation.
  • the sugar crystals then slide correspondingly slowly with the mashing medium in the direction of the outlet nozzle 62 of the collecting channel 61 in the further treatment device 60.
  • the affection magma thus formed which flows off very slowly, flows through the outlet nozzle (s) 62 without forming a sump.
  • the reduced speed of the movement process is further promoted by the inclined surface between the collecting channels 61. From the impact surface 64, the mash medium, together with the sugar crystals embedded therein, does not statistically to a large extent slide directly into the collecting channel 61, but first onto the inclined surface 69 and only slowly on this towards the outlet connection 62.
  • the two preferred ring lines 65 and 66 have a very different effect and are each used in one of the two possible uses of a dissolving centrifuge or a mashing centrifuge and also emit very different media for their respective intended use.
  • the same centrifuge can be used once for mashing in and once for dissolving; the additional components to be provided (a second ring line, a special profile for a further treatment device and various overflow nozzles) are not important.
  • the further treatment device 60 with the collecting channel 61 as the core is manufactured as a structural unit and is designed to be easy to assemble or disassemble. It can be hung in the frame 10 - a standard housing - and fastened between the housing flange and the cover 13. It can be removed at any time if the centrifuge is not to be used as a mashing or disintegrating centrifuge, but instead is to discharge dry sugar.
  • a third type of centrifuge with a completely different field of application is thus created from the same centrifuge without major modifications.
  • the preferred embodiment of the centrifuge is also equipped with a variable baffle cone 70 for further optimization of the baffle surface 64 which adapts it even better to the different requirements.
  • the basic physical idea is shown schematically in FIG. 4 and FIG. 5: Since in a mashing centrifuge the sugar crystals or particles P are to be transferred into the mash from their horizontal movement after being centrifuged relatively gently, it is advantageous if a cone is provided radially circumferentially above the collecting channel for deflecting downwards by 90 ° or approximately 90 ° whose slope is directed inwards, i.e. would have its virtual cone tip above the centrifuge (FIG. 4).
  • FIG. 5 shows an impact cone 70 with a virtual cone tip below the centrifuge. Particles P striking the surface sloping outwards are deflected upwards and slide upwards on the slope against the force of gravity, then slide downwards again and thereby hit but frontally against the next impinging particles P, so that there is a constant mixing with further abruptly decelerated particles P until they fall into the collecting channels 61.
  • the impact cone 70 is simply removed and installed the other way round.
  • the assembly is carried out by two loose pipe sections 71, 72, which are cut off diagonally from the same pipe, taking into account the slope of the impact cone 70.
  • the latter contains bores which run horizontally when installed; a screw 73 is inserted through the two pipe sections 71, 72 and the bore of the baffle cone 70 between them and anchored horizontally in the outer wall of the collecting channel 61 or the side wall 12 of the frame 10.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Centrifugal Separators (AREA)
EP95110469A 1994-07-15 1995-07-05 Centrifugeuse travaillant en continu pour la centrifugation de masses cuites Expired - Lifetime EP0692311B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4425063 1994-07-15
DE4425063A DE4425063C2 (de) 1994-07-15 1994-07-15 Kontinuierlich arbeitende Zentrifuge zum Abschleudern von Zuckerfüllmassen

Publications (2)

Publication Number Publication Date
EP0692311A1 true EP0692311A1 (fr) 1996-01-17
EP0692311B1 EP0692311B1 (fr) 1999-05-19

Family

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Family Applications (1)

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EP95110469A Expired - Lifetime EP0692311B1 (fr) 1994-07-15 1995-07-05 Centrifugeuse travaillant en continu pour la centrifugation de masses cuites

Country Status (3)

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US (1) US5618352A (fr)
EP (1) EP0692311B1 (fr)
DE (2) DE4425063C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010130828A1 (fr) * 2009-05-15 2010-11-18 Braunschweigische Maschinenbauanstalt Ag Centrifugeuse à fonctionnement continu

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6663774B2 (en) 2000-10-16 2003-12-16 Weatherford/Lamb, Inc. Centrifuge screen
US6761821B2 (en) * 2002-09-23 2004-07-13 Weatherford/Lamb, Inc. Clamping-hook ring

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1247279A (en) * 1969-12-10 1971-09-22 Western States Machine Co Improvements in or relating to centrifugal straining apparatus
DE2550496A1 (de) 1975-11-11 1977-05-18 Braunschweigische Masch Bau Verfahren und zentrifuge zum abschleudern und wiederaufloesen von zucker
DE2910625A1 (de) 1979-03-17 1980-09-18 Hein Lehmann Ag Kontinuierlich arbeitende zentrifuge
EP0050559A2 (fr) * 1980-10-17 1982-04-28 FIVES-CAIL BABCOCK, Société anonyme Essoreuse centrifuge à marche continue équipée d'un dispositif d'empatage
DE2207663C3 (de) 1972-02-18 1984-04-26 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Kontinuierlich arbeitende Zuckerzentrifuge
FR2563448A3 (fr) * 1984-04-26 1985-10-31 Krupp Gmbh Machine centrifuge a tamis fonctionnant en continu, notamment pour sucreries
EP0252341A2 (fr) * 1986-07-09 1988-01-13 Dorr-Oliver Deutschland GmbH Centrifuge à tamis travaillant en continu avec entraînement par le haut
DE9004952U1 (de) 1990-04-28 1991-08-22 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Siebzentrifuge
US5114489A (en) * 1990-11-29 1992-05-19 Silver Engineering Works, Inc. Means for producing a high brix sugar liquid
EP0487780B1 (fr) 1990-11-30 1994-03-30 Braunschweigische Maschinenbauanstalt AG Centrifugeuse travaillant en continu pour la centrifugation de masses cuites

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US157595A (en) * 1874-12-08 Improvement in centrifugal machines
US105520A (en) * 1870-07-19 Improved centrifugal sugar draining and molding machine
US2099963A (en) * 1935-10-16 1937-11-23 Prager Herman Method of forming a draft passage in the end of a cigar
US3226257A (en) * 1961-10-09 1965-12-28 American Factors Ass Ltd Continuous centrifugal apparatus
US3302794A (en) * 1964-10-30 1967-02-07 Western States Machine Co Continuous centrifugal with adjustable liquids separator
US3490947A (en) * 1967-07-10 1970-01-20 Western States Machine Co Anticrusting apparatus for continuous sugar centrifugal
NL8200100A (nl) * 1981-02-24 1982-09-16 Braunschweigische Masch Bau Continu werkende suikercentrifuge.
US5281275A (en) * 1991-12-13 1994-01-25 Silver Engineering Works, Inc. Apparatus and method for enhancing sugar crystal/molasses separation efficiency in a sugar centrifugal
US5286298A (en) * 1991-12-13 1994-02-15 Silver Engineering Works, Inc. Device and method for reducing crystal impact damage and lump formation in a sugar centrifugal
US5286299A (en) * 1991-12-13 1994-02-15 Silver Engineering Works, Inc. Apparatus and method for providing reduced crystal damage in a sugar centrifugal
US5269849A (en) * 1992-06-25 1993-12-14 Silver-Weibull Apparatus and method for reducing lump formation and crystal impact damage in a sugar centrifugal
US5368541A (en) * 1993-06-03 1994-11-29 Knelson; Benjamin V. Method of extraction of mercury and gold from mine tailings

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1247279A (en) * 1969-12-10 1971-09-22 Western States Machine Co Improvements in or relating to centrifugal straining apparatus
DE2207663C3 (de) 1972-02-18 1984-04-26 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Kontinuierlich arbeitende Zuckerzentrifuge
DE2550496A1 (de) 1975-11-11 1977-05-18 Braunschweigische Masch Bau Verfahren und zentrifuge zum abschleudern und wiederaufloesen von zucker
DE2910625A1 (de) 1979-03-17 1980-09-18 Hein Lehmann Ag Kontinuierlich arbeitende zentrifuge
EP0050559A2 (fr) * 1980-10-17 1982-04-28 FIVES-CAIL BABCOCK, Société anonyme Essoreuse centrifuge à marche continue équipée d'un dispositif d'empatage
FR2563448A3 (fr) * 1984-04-26 1985-10-31 Krupp Gmbh Machine centrifuge a tamis fonctionnant en continu, notamment pour sucreries
EP0252341A2 (fr) * 1986-07-09 1988-01-13 Dorr-Oliver Deutschland GmbH Centrifuge à tamis travaillant en continu avec entraînement par le haut
DE9004952U1 (de) 1990-04-28 1991-08-22 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Siebzentrifuge
US5114489A (en) * 1990-11-29 1992-05-19 Silver Engineering Works, Inc. Means for producing a high brix sugar liquid
EP0487780B1 (fr) 1990-11-30 1994-03-30 Braunschweigische Maschinenbauanstalt AG Centrifugeuse travaillant en continu pour la centrifugation de masses cuites

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010130828A1 (fr) * 2009-05-15 2010-11-18 Braunschweigische Maschinenbauanstalt Ag Centrifugeuse à fonctionnement continu
US9174224B2 (en) 2009-05-15 2015-11-03 Bma Braunschweigische Maschinenbauanstalt Ag Continuously operating centrifuge

Also Published As

Publication number Publication date
DE59505957D1 (de) 1999-06-24
EP0692311B1 (fr) 1999-05-19
US5618352A (en) 1997-04-08
DE4425063A1 (de) 1996-01-18
DE4425063C2 (de) 1999-05-06

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