EP0230205B1 - Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen - Google Patents

Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen Download PDF

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Publication number
EP0230205B1
EP0230205B1 EP86710003A EP86710003A EP0230205B1 EP 0230205 B1 EP0230205 B1 EP 0230205B1 EP 86710003 A EP86710003 A EP 86710003A EP 86710003 A EP86710003 A EP 86710003A EP 0230205 B1 EP0230205 B1 EP 0230205B1
Authority
EP
European Patent Office
Prior art keywords
ring
mingling
mashing
filter cage
centrifuge
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
Application number
EP86710003A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0230205A1 (de
Inventor
Helmut Schaper
Heinrich Kurland
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.)
Filing date
Publication date
Application filed by BMA Braunschweigische Maschinenbauanstalt AG filed Critical BMA Braunschweigische Maschinenbauanstalt AG
Priority to DE8686710003T priority Critical patent/DE3665993D1/de
Priority to EP86710003A priority patent/EP0230205B1/de
Priority to JP62003433A priority patent/JPH0636884B2/ja
Priority to IN25/MAS/87A priority patent/IN168780B/en
Publication of EP0230205A1 publication Critical patent/EP0230205A1/de
Priority to US07/183,290 priority patent/US4802925A/en
Application granted granted Critical
Publication of EP0230205B1 publication Critical patent/EP0230205B1/de
Expired 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 mashing and draining of sugar filling masses with an upwardly conically enlarged sieve basket rotating about a vertical axis, which has a feed and distribution pot on a hub projecting upwards into the basket interior and one from the distribution pot to the bottom area of the strainer basket which extends downwards and has a conical expansion bell, which is designed as a pre-centrifugal drum, and the discharge edge of which is enclosed by a mashing device which has a mashing ring which surrounds the discharge edge with play and channels in the region of the ring for the supply of mash liquid.
  • Centrifuges of the aforementioned type are known (DE-GM 79 34 091), in which a mashing ring is provided which is driven or is stationary at a lower speed than the pre-spinner, and which is approximately C-shaped and open towards the discharge edge of the pre-spinner Cross section forms.
  • the channels in the area of the mashing ring for the supply of the mashing liquid are formed in the known solution as supply channels rotating with the centrifuge, so that the mashing liquid is thrown into the mashing ring by centrifugal force.
  • the mashing ring In order to achieve the desired effect of the mixture of the crystalline mass with the mashing liquid in the C-shaped mashing ring and the transfer of the mashed crystalline mass to the drum bottom, it is necessary in the known devices, the mashing ring at most in relation to Rotating speed of the centrifuge very low speed. To avoid complex constructions, the known centrifuges were therefore designed in practice with a stationary, that is, non-rotating, mashing ring.
  • centrifuges mentioned at the outset have proven themselves in practice for the treatment of fillers of medium purity, in which a single washing process after the preliminary spin is not sufficient to achieve a sufficient separation of the liquid phase from the crystals.
  • the invention has for its object to develop a centrifuge of the type described in the introduction so that a safe and uniform conveying of the filling mass is achieved along the screen surface of the pre-spinning drum and a gentle treatment of the crystal mass during mashing while maintaining favorable mashing conditions is achieved and thereby an improvement in the crystal yield is achieved is, and without a noticeable increase in energy consumption for driving the centrifuge.
  • the pre-centrifugal drum has a larger opening angle than the strainer basket, that the mashing ring is designed as a co-rotating conically downwardly widened ring with a greater steepness than the strainer basket and the pre-centrifugal drum and that the channels for the mash liquid are stationary Channels are formed with outflow openings that are provided above the impact zone of the material thrown onto the mashing ring and point in the direction of the mashing ring.
  • the filling mass is reliably conveyed along the screen surface of the pre-spinning drum if it has an opening angle between 3 and 14 ° larger than the screen basket.
  • the liquid film which forms on the mashing ring also serves as a lubricant when the crystal mass strikes this ring, so that damage caused by the friction of the crystals on the mashing ring is largely prevented and at the same time mixing of these crystals with the different circumferential speeds of the liquid and the crystals the mashing liquid.
  • a complete coating of all crystals by the mashing liquid is achieved in a very short way, so that a short residence time of the crystal mass on the mashing ring is sufficient to achieve the desired mashing effect.
  • the mashing ring projects beyond the discharge edge of the pre-centrifugal drum towards the basket only over a small part of its height, at most up to half its height. Due to the described greater steepness of the conically widening mashing ring, it is sufficient in practice for the mashing ring to protrude from the throwing edge of the centrifugal drum towards the basket bottom by only one, at most a few cm.
  • a preferred embodiment of the invention provides that the mashing ring is enclosed by an accelerating device from at least two further rings arranged coaxially at a distance, one have opposite conicity, form edges at their edges of larger diameter and are axially offset from each other so that they overlap in height.
  • Accelerators of this type are known per se in centrifuges for the treatment of highly viscous fillers, but have not been used in connection with centrifuges of the type described in the generic term.
  • the crystalline mass which is obtained during pre-spinning by separating the green runoff, when striking the mashing ring with a film of a mashing liquid continuously applied to the mashing ring sugar-saturated or supersaturated solution of higher purity than the syrup adhering to the crystals is brought into contact and accelerated in the circumferential direction during mashing.
  • a mashing liquid of the aforementioned type has the great advantage that the dissolving or dissolving of crystals from the crystal mass brought together with the mashing liquid is prevented.
  • the centrifuge described is particularly suitable for the treatment of fillers of medium and high purity.
  • the drawing shows an embodiment of the invention.
  • the centrifuge shown only partially in section in FIG. 1 can be driven to rotate about the vertical axis 1. It has a sieve basket, which is denoted overall by 2 and widens upwards, which consists of a solid wall 2a and a sieve 2b held thereon at a distance and which is fixedly connected, for example welded, to the basket base 2c, which is relatively strong in the example shown.
  • the screen basket 2 is closed at the top by a relatively solid rim 2d, which is also firmly connected to the basket wall 2a in the example shown.
  • the drive shaft 3 connected to a drive is mounted in a stationary support plate 4 and carries a hub 5 which projects into the basket interior or, in the example shown, over the basket 2 and which carries a feed and distribution pot 6 at its upper end. in which the filler to be treated is added in the direction of arrow 7.
  • the feed and distribution pot 6 is enclosed by egg ner up to the area of the basket bottom 2c downwardly flared pre-centrifugal drum 8.
  • This consists, like the screen basket 2, of a solid wall 8a and a screen 8b held thereon, a bottom 8c firmly connected to the wall with a passage opening for the filling compound and at its enlarged end facing the basket base 2c, a solid annular edge 8d.
  • the annular edge 8d of the pre-centrifugal drum 8 is enclosed by a mashing ring 9, which in turn is surrounded by two coaxially spaced further rings 10 and 11, which have an opposite conicity and are axially offset from each other so that their height cover up.
  • a ring line 12 is arranged which is held stationary and is connected to a supply line 13 for the mashing liquid.
  • the filling mass transferred in the direction of arrow 7 into the feed and distribution pot 6 is accelerated, with intensive mixing and homogenization taking place at the same time. This effect is promoted by the distributor and drive pins 6a shown in the feed and distributor pot.
  • the filling compound emerging via the upper edge of the feed and distribution pot 6 reaches the screen 8b of the pre-spinning drum 8 and migrates from the bottom 8c of the pre-spinning drum in the direction of the annular edge 8d.
  • the liquid separated from the filling compound in this centrifuging process enters an annular space 15 of the annular rim 8d and leaves it via drain pipes 16, which are distributed over the circumference of the bottom 2c of the strainer basket.
  • the centrifuged liquid which forms the green drain, arrives in a collecting space 25, shown schematically in FIG. 2, from which this green drain is removed.
  • the crystalline mass remaining on the sieve 8b of the pre-centrifugal drum 8 passes over the ejection edge 17 formed by the annular edge 8d with an umbrella-like or veil-like distribution in the direction of arrow 18 onto the mashing ring 9 and is carried along by the mashing ring and further accelerated in the circumferential direction.
  • the tubular channels 14 for the supply of the mashing liquid which are arranged distributed over the circumference, end just above the impact zone of the crystalline mass on the mashing ring 9.
  • the outflow openings of the tubular channels 14 are designed to point in the direction of the mashing ring 9, i.e.
  • the mashing liquid is distributed in a film-like manner over the lower region of the mashing ring 9 and at the same time flows due to the conicity of the mashing ring 9 in the direction of its lower edge 9a.
  • tubular channels 14 for supplying the mash liquid which is shown in solid lines in the direction of the mashing ring 9
  • these can also be designed as angled channels which open out at almost a right angle onto the mashing ring 9 according to the dashed illustration 14a in FIG. 2 . It is important that the mashing liquid is applied just above the impact zone of the crystalline filling compound in such a way that a film-like distribution in the direction of the lower edge 9a of the mashing ring 9 is achieved.
  • the mashed-in crystalline mass After being spun off, the mashed-in crystalline mass reaches the acceleration ring 10 rising from the bottom 2c of the screen basket 2 via the lower edge 9a in the example shown, is again spun off like an umbrella from the upper edge of this ring and transferred to the further acceleration ring 11, of which the mashed-in one Crystal mass is again thrown out like an umbrella and reaches the inside of the sieve drum 9.
  • the mashed-in crystal mass is thrown out in cooperation with the sieve drum 2 in a known manner, a covering agent in the form of water and / or steam being added to the mass in the lower region of the sieve drum 2.
  • the liquid thrown off by the crystal mass, including the opacifying agent, passes through the through openings 19 and 20 of the wall 2a of the strainer basket 2 into a collecting space 21 which is shown schematically in FIG. 2 and which is separated from the collecting space 17 for the green drain.
  • the pre-centrifugal drum 8 has a larger opening angle compared to the screen basket 2, which results in a higher speed of movement of the filling material applied in the direction of the lower annular edge 8d. As a result, the conveyed filling mass is reliably conveyed by the pre-spinning drum 8, which cannot be seen during operation.
  • the mashing ring 9 is designed to be steeply conical in comparison to the pre-centrifugal drum 8 and the screen basket 2.
  • the crystal mass impinging on the mashing ring and the lubricant effect of the with the Kri Stall mass mixing film of the mash liquid reaches a sufficient residence time of the crystalline mass and the mash liquid.
  • the short axial path of the mixture of the crystal mass and the mashing liquid prevents the crystals from building up to clumps that are fixed in place on the mashing ring.
  • the mashing ring 9 has an L-shaped cross section and is fixedly connected to the bottom 2c of the strainer basket 2 in the region of its lower edge 9a via struts 23 arranged in a radially distributed manner.
  • struts 23 arranged in a radially distributed manner.
  • the acceleration ring 10 projecting from the bottom 2c of the strainer basket 2 is likewise firmly connected to the bottom 2c, while the external further acceleration ring 11 is fastened, preferably welded, to the outside of the mashing ring 9 via radially arranged struts or a disk 24 formed with openings.
  • a largely sugar-saturated or supersaturated solution is expediently used as the mashing liquid so that the dissolving or dissolving of the crystals is avoided as far as possible.
  • the amount of the mash liquid suitably corresponds to the amount that was previously separated from the filling compound by the green drain, since the dry matter content of the green drain generally corresponds to that of the mash liquid. If the dry matter contents of the green runoff and the mashing liquid differ very much, the necessary fluidity of the mashed-in crystal mass must be adjusted or generated by changing the ratio of the green runoff to the mashing liquid.

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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)
EP86710003A 1986-01-18 1986-01-18 Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen Expired EP0230205B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8686710003T DE3665993D1 (en) 1986-01-18 1986-01-18 Continuously operating centrifuge for mingling and centrifuging masse cuites
EP86710003A EP0230205B1 (de) 1986-01-18 1986-01-18 Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen
JP62003433A JPH0636884B2 (ja) 1986-01-18 1987-01-12 白下糖を仕込みかつ分離する連続動作遠心分離機およびこの遠心分離機の運転方法
IN25/MAS/87A IN168780B (ja) 1986-01-18 1987-01-16
US07/183,290 US4802925A (en) 1986-01-18 1988-04-11 Continuously operable centrifuge for mashing and centrifuging of sugar massecuite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86710003A EP0230205B1 (de) 1986-01-18 1986-01-18 Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen

Publications (2)

Publication Number Publication Date
EP0230205A1 EP0230205A1 (de) 1987-07-29
EP0230205B1 true EP0230205B1 (de) 1989-10-04

Family

ID=8196433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86710003A Expired EP0230205B1 (de) 1986-01-18 1986-01-18 Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen

Country Status (5)

Country Link
US (1) US4802925A (ja)
EP (1) EP0230205B1 (ja)
JP (1) JPH0636884B2 (ja)
DE (1) DE3665993D1 (ja)
IN (1) IN168780B (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3828204A1 (de) * 1988-08-19 1990-02-22 Braunschweigische Masch Bau Kontinuierlich arbeitende zentrifuge zum einmaischen und abschleudern von zuckerfuellmassen
EP0487781A1 (de) * 1990-11-30 1992-06-03 Braunschweigische Maschinenbauanstalt AG Kontinuierlich arbeitende Zentrifuge zum Abschleudern von Zuckerfüllmassen
US5720880A (en) * 1995-07-03 1998-02-24 California Pellet Mill Company Sugar centrifugal screen saver

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2333122C2 (de) * 1973-06-29 1985-08-01 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter Vorrichtung zur Betätigung eines Verschlußkörpers einer Zentrifuge
FR2245415B1 (ja) * 1973-10-02 1978-09-29 Fives Cail Babcock
US3970470A (en) * 1974-10-18 1976-07-20 Hein, Lehmann A.G. Centrifuge
DE2936659A1 (de) * 1979-09-11 1981-03-19 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Kontinuierlich arbeitende zuckerzentrifuge
DE2948691C2 (de) * 1979-12-04 1984-11-15 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Kontinuierlich arbeitende Zentrifuge zum Einmaischen und Abschleudern von Zuckerfüllmassen
AU544238B2 (en) * 1981-04-15 1985-05-23 Lehmann Hein A.G. Apparatus for separating a fillmass or massecuite by centrifugal force

Also Published As

Publication number Publication date
IN168780B (ja) 1991-06-01
JPS62216656A (ja) 1987-09-24
JPH0636884B2 (ja) 1994-05-18
EP0230205A1 (de) 1987-07-29
DE3665993D1 (en) 1989-11-09
US4802925A (en) 1989-02-07

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